1# CodecBase 2 3 4## Overview 5 6The CodecBase module provides the variables, attributes, and functions for basic audio and video muxing, demuxing, encoding, and decoding. 7 8**System capability**: SystemCapability.Multimedia.Media.CodecBase 9 10**Since**: 9 11 12### Media Codec Formats 13 14The table below lists the media codec formats. The type is a constant string. 15 16| Name | Description | 17| ------------------------------------------------------------ | ------------------------------------------------------ | 18| [OH_AVCODEC_MIMETYPE_AUDIO_AAC](#oh_avcodec_mimetype_audio_aac) | MIME type of the AAC audio codec. | 19| [OH_AVCODEC_MIMETYPE_AUDIO_FLAC](#oh_avcodec_mimetype_audio_flac) | MIME type of the Free Lossless Audio Codec (FLAC) audio codec. | 20| [OH_AVCODEC_MIMETYPE_AUDIO_OPUS](#oh_avcodec_mimetype_audio_opus) | MIME type of the Opus audio codec. <!--Del-->(This specification is not available yet.)<!--DelEnd--> | 21| [OH_AVCODEC_MIMETYPE_AUDIO_G711MU](#oh_avcodec_mimetype_audio_g711mu) | MIME type of the G.711 mu-law audio codec. | 22| [OH_AVCODEC_MIMETYPE_AUDIO_VORBIS](#oh_avcodec_mimetype_audio_vorbis) | MIME type of the Vorbis audio decoder. | 23| [OH_AVCODEC_MIMETYPE_AUDIO_MPEG](#oh_avcodec_mimetype_audio_mpeg) | MIME type of the MP3 audio decoder. | 24| [OH_AVCODEC_MIMETYPE_AUDIO_VIVID](#oh_avcodec_mimetype_audio_vivid) | MIME type of the Audio Vivid audio decoder. <!--Del-->(This specification is not available yet.)<!--DelEnd--> | 25| [OH_AVCODEC_MIMETYPE_AUDIO_AMR_NB](#oh_avcodec_mimetype_audio_amr_nb) | MIME type of the AMR-NB audio decoder. | 26| [OH_AVCODEC_MIMETYPE_AUDIO_AMR_WB](#oh_avcodec_mimetype_audio_amr_wb) | MIME type of the AMR-WB audio decoder. | 27| [OH_AVCODEC_MIMETYPE_AUDIO_APE](#oh_avcodec_mimetype_audio_ape) |MIME type of the APE audio decoder. | 28| [OH_AVCODEC_MIMETYPE_VIDEO_HEVC](#oh_avcodec_mimetype_video_hevc) | MIME type of the HEVC (H.265) video codec. | 29| [OH_AVCODEC_MIMETYPE_VIDEO_AVC](#oh_avcodec_mimetype_video_avc) | Multipurpose Internet Mail Extension (MIME) type of AVC (H.264) video codec. | 30| [OH_AVCODEC_MIMETYPE_VIDEO_MPEG4](#oh_avcodec_mimetype_video_mpeg4) | MIME type of the MPEG4 video encoder, which is used only for muxing MPEG4 video streams.| 31| [OH_AVCODEC_MIMETYPE_IMAGE_JPG](#oh_avcodec_mimetype_image_jpg) | MIME type of the JPG image encoder, which is used only for muxing JPG covers. | 32| [OH_AVCODEC_MIMETYPE_IMAGE_PNG](#oh_avcodec_mimetype_image_png) | MIME type of the PNG image encoder, which is used only for muxing PNG covers. | 33| [OH_AVCODEC_MIMETYPE_IMAGE_BMP](#oh_avcodec_mimetype_image_bmp) | MIME type of the BMP image encoder, which is used only for muxing BMP covers. | 34| [OH_AVCODEC_MIMETYPE_SUBTITLE_WEBVTT](#oh_avcodec_mimetype_subtitle_webvtt) |MIME type of the WEBVTT subtitle demuxer. | 35| [OH_AVCODEC_MIMETYPE_SUBTITLE_SRT](#oh_avcodec_mimetype_subtitle_srt) |MIME type of the SRT subtitle demuxer. | 36 37 38### Media Data Key-Value Pairs 39 40The table below lists the key-value pairs used to describe media data. The key type is a constant string, and the value type can be int32_t, int64_t, float, double, char *, or uint8_t *. 41 42The OH_AVFormat API is used to configure or query parameters. 43 44Key-value pairs dedicated for capability query: 45 46| Name | Description | 47| ------------------------------------------------------------ | ------------------------------------------------------------ | 48| [OH_FEATURE_PROPERTY_KEY_VIDEO_ENCODER_MAX_LTR_FRAME_COUNT](#oh_feature_property_key_video_encoder_max_ltr_frame_count) | Maximum number of long-term reference (LTR) frames obtained during video encoding. The value type is int32_t.| 49 50Common key-value pairs of audio and video: 51 52| Name | Description | 53| ------------------------------------------------------------ | ------------------------------------------------------------ | 54| [OH_MD_KEY_CODEC_CONFIG](#oh_md_key_codec_config) | Codec-specific data. In the case of video, data carried in **SPS/PPS** is transferred. In the case of audio, data carried in **extraData** is transferred. The value type is uint8_t\*. This key is optional. <!--Del-->(This key is not supported yet for the video codec.)<!--DelEnd--> | 55| [OH_MD_MAX_INPUT_BUFFER_COUNT](#oh_md_max_input_buffer_count) | Maximum number of input buffers. The value type is int32_t. This key is optional. | 56| [OH_MD_MAX_OUTPUT_BUFFER_COUNT](#oh_md_max_output_buffer_count) | Maximum number of output buffers. The value type is int32_t. This key is optional. | 57| [OH_MD_KEY_BITRATE](#oh_md_key_bitrate) | Bit rate. The value type is int64_t. This key is used in audio and video encoding scenarios. It is optional in video encoding scenarios.| 58| [OH_MD_KEY_PROFILE](#oh_md_key_profile) | Encoding grading. The value type is int32_t. For details, see [OH_AVCProfile](#oh_avcprofile), [OH_HEVCProfile](#oh_hevcprofile), and [OH_AACProfile](#oh_aacprofile). This key is optional.| 59| [OH_MD_KEY_MAX_INPUT_SIZE](#oh_md_key_max_input_size) | Maximum size of an input stream to decode. The value type is int32_t. This key is optional. | 60 61 62The table below lists the video-dedicated key-value pairs. 63 64| Name | Description | 65| ------------------------------------------------------------ | ------------------------------------------------------------ | 66| [OH_ED_KEY_TIME_STAMP](#oh_ed_key_time_stamp) | Surface buffer timestamp. The value is of the int64_t type. This key is optional. <!--Del-->(This key is not supported yet.)<!--DelEnd--> | 67| [OH_ED_KEY_EOS](#oh_ed_key_eos) | End of stream for the surface buffer. The value type is int32_t. This key is optional. <!--Del-->(This key is not supported yet.)<!--DelEnd-->| 68| [OH_MD_KEY_WIDTH](#oh_md_key_width) | Video width. The value type is int32_t. | 69| [OH_MD_KEY_HEIGHT](#oh_md_key_height) | Video height. The value type is int32_t. | 70| [OH_MD_KEY_PIXEL_FORMAT](#oh_md_key_pixel_format) | Video pixel format. The value type is int32_t. For details, see [OH_AVPixelFormat](_core.md#oh_avpixelformat).| 71| [OH_MD_KEY_FRAME_RATE](#oh_md_key_frame_rate) | Video frame rate. The value type is double. This key is optional. | 72| [OH_MD_KEY_RANGE_FLAG](#oh_md_key_range_flag) | Video YUV value range flag. The value type is int32_t. The value **1** means a full range, and **0** means a limited range. This key is optional.| 73| [OH_MD_KEY_COLOR_PRIMARIES](#oh_md_key_color_primaries) | Video primary color. The value type is int32_t. For details, see [OH_ColorPrimary](#oh_colorprimary). The video primary color complies with Table 2 in the H.273 standard. This key is optional.| 74| [OH_MD_KEY_TRANSFER_CHARACTERISTICS](#oh_md_key_transfer_characteristics) | Video transfer characteristics. The value type is int32_t. For details, see [OH_TransferCharacteristic](#oh_transfercharacteristic). The video transfer characteristics comply with Table 3 in the H.273 standard. This key is optional.| 75| [OH_MD_KEY_MATRIX_COEFFICIENTS](#oh_md_key_matrix_coefficients) | Video matrix coefficient. The value type is int32_t. For details, see [OH_MatrixCoefficient](#oh_matrixcoefficient). The video matrix coefficient complies with Table 4 in the H.273 standard. This key is optional.| 76| [OH_MD_KEY_VIDEO_STRIDE](#oh_md_key_video_stride) | Stride of the video frame. The value type is int32_t. This key is optional. | 77| [OH_MD_KEY_VIDEO_SLICE_HEIGHT](#oh_md_key_video_slice_height) | Height of the video frame. The value type is int32_t. This key is optional. | 78| [OH_MD_KEY_VIDEO_PIC_WIDTH](#oh_md_key_video_pic_width) | Width of the video frame. The value type is int32_t. This key is optional. | 79| [OH_MD_KEY_VIDEO_PIC_HEIGHT](#oh_md_key_video_pic_height) | Height of the video frame. The value type is int32_t. This key is optional. | 80| [OH_MD_KEY_VIDEO_ENABLE_LOW_LATENCY](#oh_md_key_video_enable_low_latency) | Enabled status of low-latency video codec. The value type is int32_t. The value **1** means that low-latency video codec is enabled, and **0** means the opposite. This key is optional and used only in the configuration phase.| 81| [OH_MD_KEY_VIDEO_ENCODE_BITRATE_MODE](#oh_md_key_video_encode_bitrate_mode) | Video encoding bit rate mode. The value type is int32_t. For details, see [OH_VideoEncodeBitrateMode](_video_encoder.md#oh_videoencodebitratemode). This key is optional.| 82| [OH_MD_KEY_QUALITY](#oh_md_key_quality) | Required encoding quality. The value type is int32_t. This key applies only to encoders configured in constant quality mode. This key is optional.| 83| [OH_MD_KEY_REQUEST_I_FRAME](#oh_md_key_request_i_frame) | Request for immediate encoding of I-frames. The value type is int32_t. This key is optional. | 84| [OH_MD_KEY_I_FRAME_INTERVAL](#oh_md_key_i_frame_interval) | Key frame interval, in milliseconds. The value type is int32_t. This key is optional and is used only for video encoding.| 85| [OH_MD_KEY_VIDEO_ENCODER_ENABLE_TEMPORAL_SCALABILITY](#oh_md_key_video_encoder_enable_temporal_scalability) | Enabled status of temporal scalability. The value type is int32_t. The value **1** means temporal scalability is enabled, and **0** means the opposite. This key is optional and used only in the configuration phase of video encoding.| 86| [OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_SIZE](#oh_md_key_video_encoder_temporal_gop_size) | Size of a temporal image group. The value type is int32_t. This key is valid only when temporal scalability is enabled. This key is optional and used only in the configuration phase of video encoding.| 87| [OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_REFERENCE_MODE](#oh_md_key_video_encoder_temporal_gop_reference_mode) | Reference mode in a temporal image group. The value type is int32_t. For details, see [OH_TemporalGopReferenceMode](#oh_temporalgopreferencemode-1). This key is valid only when temporal scalability is enabled. This key is optional and used only in the configuration phase of video encoding.| 88| [OH_MD_KEY_VIDEO_ENCODER_LTR_FRAME_COUNT](#oh_md_key_video_encoder_ltr_frame_count) | Number of LTR frames. The value type is int32_t. The value must be within the supported value range. This key is optional and is used only for video encoding.| 89| [OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_MARK_LTR](#oh_md_key_video_encoder_per_frame_mark_ltr) | Whether the current frame is marked as an LTR frame. The value type is int32_t. The value **1** means that the frame is marked as an LTR frame, and **0** means the opposite. This key is optional and is used only for video encoding.| 90| [OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_USE_LTR](#oh_md_key_video_encoder_per_frame_use_ltr) | LTR frame referenced by the current frame. The value type is int32_t. This key is optional and is used only for video encoding.| 91| [OH_MD_KEY_VIDEO_PER_FRAME_IS_LTR](#oh_md_key_video_per_frame_is_ltr) | Whether the frame corresponding to the stream output from the current OH_AVBuffer is marked as an LTR frame. The value type is int32_t. The value **1** means that the frame is an LTR frame, and **0** means the opposite. This key is optional and is used only for video encoding.| 92| [OH_MD_KEY_VIDEO_PER_FRAME_POC](#oh_md_key_video_per_frame_poc) | POC of the frame. The value type is int32_t. This key is optional and is used only for video encoding.| 93| [OH_MD_KEY_VIDEO_ENCODER_QP_MAX](#oh_md_key_video_encoder_qp_max) | Maximum Quantization Parameter (QP) allowed by the video encoder. The value type is int32_t. This key is optional.| 94| [OH_MD_KEY_VIDEO_ENCODER_QP_MIN](#oh_md_key_video_encoder_qp_min) | Minimum QP allowed by the video encoder. The value type is int32_t. This key is optional.| 95| [OH_MD_KEY_VIDEO_ENCODER_QP_AVERAGE](#oh_md_key_video_encoder_qp_average) |Average QP of video frames. The value type is int32_t. This key is optional. | 96| [OH_MD_KEY_VIDEO_ENCODER_MSE](#oh_md_key_video_encoder_mse) |Mean Squared Error (MSE) of video frames. The value type is double. This key is optional. | 97| [OH_MD_KEY_VIDEO_DECODER_OUTPUT_COLOR_SPACE](#oh_md_key_video_decoder_output_color_space) | Output color space of the video decoder. The value type is int32_t. The supported value is **OH_COLORSPACE_BT709_LIMIT**.| 98| [OH_MD_KEY_ROTATION](#oh_md_key_rotation) | Rotation angle of the surface. The value type is int32_t, and the value range is {0, 90, 180, 270}. The default value is 0. This key is optional and is used only for video decoding in surface mode | 99| [OH_MD_KEY_SCALING_MODE](#oh_md_key_scaling_mode) | Video scaling mode. The value type is int32_t. For details, see [OH_ScalingMode](#oh_scalingmode). This key is optional and is used only for video decoding in surface mode. You are advised to set the scaling mode by calling [OH_NativeWindow_NativeWindowSetScalingModeV2](../apis-arkgraphics2d/_native_window.md).| 100| [OH_MD_KEY_VIDEO_CROP_TOP](#oh_md_key_video_crop_top) | Top coordinate (y) of the cropped rectangle. The value type is int32_t. This key is optional and is used only for video decoding.| 101| [OH_MD_KEY_VIDEO_CROP_BOTTOM](#oh_md_key_video_crop_bottom) | Bottom coordinate (y) of the cropped rectangle. The value type is int32_t. This key is optional and is used only for video decoding.| 102| [OH_MD_KEY_VIDEO_CROP_LEFT](#oh_md_key_video_crop_left) | Left coordinate (x) of the cropped rectangle. The value type is int32_t. This key is optional and is used only for video decoding.| 103| [OH_MD_KEY_VIDEO_CROP_RIGHT](#oh_md_key_video_crop_right) | Right coordinate (x) of the cropped rectangle. The value type is int32_t. This key is optional and is used only for video decoding.| 104 105 106The table below lists the audio-dedicated key-value pairs. 107 108| Name | Description | 109| ------------------------------------------------------------ | ------------------------------------------------------------ | 110| [OH_MD_KEY_AUDIO_SAMPLE_FORMAT](#oh_md_key_audio_sample_format) | Original audio format. The value type is int32_t. For details, see [AudioSampleFormat](../apis-audio-kit/js-apis-audio.md#audiosampleformat8). | 111| [OH_MD_KEY_AUD_CHANNEL_COUNT](#oh_md_key_aud_channel_count) | Number of audio channels. The value type is int32_t. | 112| [OH_MD_KEY_AUD_SAMPLE_RATE](#oh_md_key_aud_sample_rate) | Audio sampling rate. The value type is int32_t. | 113| [OH_MD_KEY_AUDIO_COMPRESSION_LEVEL](#oh_md_key_audio_compression_level) | Audio codec compression level. The value type is int32_t type. This key is used only for audio encoding. This key is optional. | 114| [OH_MD_KEY_CHANNEL_LAYOUT](#oh_md_key_channel_layout) | Required encoding channel layout. The value type is int64_t. This key applies only to encoders. | 115| [OH_MD_KEY_BITS_PER_CODED_SAMPLE](#oh_md_key_bits_per_coded_sample) | Number of bits for each coded sample. The value type is int32_t. This key applies to FLAC encoders. For details, see [OH_BitsPerSample](#oh_bitspersample). This key is optional.| 116| [OH_MD_KEY_SBR](#oh_md_key_sbr) | AAC SBR format. The value type is int32_t. This key applies to AAC encoders. This key is optional.| 117| [OH_MD_KEY_COMPLIANCE_LEVEL](#oh_md_key_compliance_level) | FLAC compliance level. The value type is int32_t. This key is used only for audio encoding. This key is optional. | 118| [OH_MD_KEY_AAC_IS_ADTS](#oh_md_key_aac_is_adts) | AAC format, which can be ADTS or LATM. The value type is int32_t. This key applies to AAC decoders. This key is optional. | 119| [OH_MD_KEY_IDENTIFICATION_HEADER](#oh_md_key_identification_header) | Vorbis identification header. The value type is uint8_t\*. This key applies only to Vorbis decoders. This key is optional.| 120| [OH_MD_KEY_SETUP_HEADER](#oh_md_key_setup_header) | Vorbis setup header. The value type is uint8_t\*. This key applies only to Vorbis decoders. This key is optional.| 121| [OH_MD_KEY_AUDIO_OBJECT_NUMBER](#oh_md_key_audio_object_number) | Number of audio objects. The value type is int32_t. This key is used only for Audio Vivid decoding. This key is optional. | 122| [OH_MD_KEY_AUDIO_VIVID_METADATA](#oh_md_key_audio_vivid_metadata) | Audio Vivid metadata. The value type is uint8_t\*. This key is used only for Audio Vivid decoding. This key is optional. | 123 124The table below lists the key-value pairs dedicated for muxing and demuxing. 125 126| Name | Description | 127| ------------------------------------------------------------ | ------------------------------------------------------------ | 128| [OH_MD_KEY_VIDEO_IS_HDR_VIVID](#oh_md_key_video_is_hdr_vivid) | Whether the video track in a media file is HDR Vivid. The value type is int32_t. This key is used for both muxing and demuxing. This key is optional. | 129| [OH_MD_KEY_START_TIME](#oh_md_key_start_time) | Start time of the first frame in a media file. The value type is int64_t. This key is optional. | 130| [OH_MD_KEY_TRACK_START_TIME](#oh_md_key_track_start_time) | Track start time. The value type is int64_t. This key is optional. | 131| [OH_MD_KEY_TRACK_TYPE](#oh_md_key_track_type) | Track type in a media file. The value type is int32_t. For details, see [OH_MediaType](#oh_mediatype-1). This key is optional.| 132| [OH_MD_KEY_DURATION](#oh_md_key_duration) | Duration in a media file. The value type is int64_t. This key is optional. | 133| [OH_MD_KEY_TITLE](#oh_md_key_title) | Title in a media file. The value type is string. This key is optional. | 134| [OH_MD_KEY_ARTIST](#oh_md_key_artist) | Artist in a media file. The value type is string. This key is optional. | 135| [OH_MD_KEY_ALBUM](#oh_md_key_album) | Album in a media file. The value type is string. This key is optional. | 136| [OH_MD_KEY_ALBUM_ARTIST](#oh_md_key_album_artist) | Album artist of the input media. The value type is string. This key is optional. | 137| [OH_MD_KEY_DATE](#oh_md_key_date) | Date in a media file, for example, 2024. The value type is string. This key is optional. | 138| [OH_MD_KEY_COMMENT](#oh_md_key_comment) | Comment in a media file. The value type is string. This key is optional. | 139| [OH_MD_KEY_GENRE](#oh_md_key_genre) | Genre in a media file. The value type is string. This key is optional. | 140| [OH_MD_KEY_COPYRIGHT](#oh_md_key_copyright) | Copyright in a media file. The value type is string. This key is optional. | 141| [OH_MD_KEY_LANGUAGE](#oh_md_key_language) | Language in a media file. The value type is string. This key is optional. | 142| [OH_MD_KEY_DESCRIPTION](#oh_md_key_description) | Description in a media file. The value type is string. This key is optional. | 143| [OH_MD_KEY_LYRICS](#oh_md_key_lyrics) | Lyrics in a media file. The value type is string. This key is optional. | 144| [OH_MD_KEY_TRACK_COUNT](#oh_md_key_track_count) | Number of tracks in a media file. The value type is int32_t. This key is optional. | 145| [OH_MD_KEY_BUFFER_DURATION](#oh_md_key_buffer_duration) | Duration corresponding to the audio, video, or subtitle sample carried in AVBuffer, in microseconds. The value type is int64_t. This key is optional. | 146| [OH_MD_KEY_DECODING_TIMESTAMP](#oh_md_key_decoding_timestamp) | Decoding timestamp corresponding to the audio, video, or subtitle sample carried in AVBuffer, in microseconds. The value type is int64_t. This key is optional. | 147| [OH_MD_KEY_CODEC_MIME](#oh_md_key_codec_mime) | MIME type of the codec. The value type is string. This key is optional. | 148| [OH_MD_KEY_VIDEO_SAR](#oh_md_key_video_sar) | Aspect ratio of the sample. The value type is double.| 149 150 151## Summary 152 153 154### Files 155 156| Name| Description| 157| -------- | -------- | 158| [avcodec_audio_channel_layout.h](avcodec__audio__channel__layout_8h.md) | Declares the enums used for audio codec.| 159| [native_avcodec_base.h](native__avcodec__base_8h.md) | Declares the native APIs used for basic audio and video muxing, demuxing, encoding, and decoding.| 160 161 162### Structs 163 164| Name| Description| 165| -------- | -------- | 166| struct [OH_AVCodecAsyncCallback](_o_h___a_v_codec_async_callback.md) | Describes all the asynchronous callback function pointers of an **OH_AVCodec** instance. (This function is deprecated in API version 11.)| 167| struct [OH_AVCodecCallback](_o_h___a_v_codec_callback.md) | Describes all the asynchronous callback function pointers of an **OH_AVCodec** instance.| 168| struct [OH_AVDataSource](_o_h___a_v_data_source.md) | Describes a user-defined data source. | 169 170 171### Types 172 173| Name| Description| 174| -------- | -------- | 175| typedef struct NativeWindow [OHNativeWindow](#ohnativewindow) | Defines a struct for a native object for the graphics interface. | 176| typedef struct [OH_AVCodec](#oh_avcodec) [OH_AVCodec](#oh_avcodec) | Defines a struct for a native object for the audio and video codec interface. | 177| typedef void(\* [OH_AVCodecOnError](#oh_avcodeconerror)) ([OH_AVCodec](#oh_avcodec) \*codec, int32_t errorCode, void \*userData) | Defines the pointer to the function that is called to report error information when an error occurs during the running of an **OH_AVCodec** instance.| 178| typedef void(\* [OH_AVCodecOnStreamChanged](#oh_avcodeconstreamchanged)) ([OH_AVCodec](#oh_avcodec) \*codec, [OH_AVFormat](_core.md#oh_avformat) \*format, void \*userData) | Defines the pointer to the function that is called to report the new stream description when the resolution of the input stream being decoded or the output stream that has been encoded changes.| 179| typedef void(\* [OH_AVCodecOnNeedInputData](#oh_avcodeconneedinputdata)) ([OH_AVCodec](#oh_avcodec) \*codec, uint32_t index, [OH_AVMemory](_core.md#oh_avmemory) \*data, void \*userData) | Defines the pointer to the function that is called when new input data is required during the running of an **OH_AVCodec** instance. The function carries a buffer to fill in new input data. (This function is deprecated in API version 11.)| 180| typedef void(\* [OH_AVCodecOnNewOutputData](#oh_avcodeconnewoutputdata)) ([OH_AVCodec](#oh_avcodec) \*codec, uint32_t index, [OH_AVMemory](_core.md#oh_avmemory) \*data, [OH_AVCodecBufferAttr](_o_h___a_v_codec_buffer_attr.md) \*attr, void \*userData) | Defines the pointer to the function that is called when new output data is generated during the running of an **OH_AVCodec** instance. The function carries a buffer filled with new output data. (This function is deprecated in API version 11.)| 181| typedef void(\* [OH_AVCodecOnNeedInputBuffer](#oh_avcodeconneedinputbuffer)) ([OH_AVCodec](#oh_avcodec) \*codec, uint32_t index, [OH_AVBuffer](_core.md#oh_avbuffer) \*buffer, void \*userData) | Defines the pointer to the function that is called when new input data is required during the running of an **OH_AVCodec** instance. The function carries a buffer to fill in new input data.| 182| typedef void(\* [OH_AVCodecOnNewOutputBuffer](#oh_avcodeconnewoutputbuffer)) ([OH_AVCodec](#oh_avcodec) \*codec, uint32_t index, [OH_AVBuffer](_core.md#oh_avbuffer) \*buffer, void \*userData) | Defines the pointer to the function that is called when new output data is generated during the running of an **OH_AVCodec** instance. The function carries a buffer filled with new output data.| 183| typedef struct [OH_AVCodecAsyncCallback](_o_h___a_v_codec_async_callback.md) [OH_AVCodecAsyncCallback](#oh_avcodecasynccallback) | Defines all the asynchronous callback function pointers of an **OH_AVCodec** instance. (This function is deprecated in API version 11.)| 184| typedef struct [OH_AVCodecCallback](_o_h___a_v_codec_callback.md) [OH_AVCodecCallback](#oh_avcodeccallback) | Defines all the asynchronous callback function pointers of an **OH_AVCodec** instance.| 185| typedef int32_t(\* [OH_AVDataSourceReadAt](#oh_avdatasourcereadat)) (OH_AVBuffer \*data, int32_t length, int64_t pos) | Defines a function pointer used to provide the capability of obtaining user-defined media data. | 186| typedef struct [OH_AVDataSource](_o_h___a_v_data_source.md) [OH_AVDataSource](#oh_avdatasource) | Defines a struct for a user-defined data source. | 187| typedef enum [OH_MediaType](#oh_mediatype-1) [OH_MediaType](#oh_mediatype) | Defines an enum for the media types.| 188| typedef enum [OH_AACProfile](#oh_aacprofile-1) [OH_AACProfile](#oh_aacprofile) | Defines an enum for the Advanced Audio Coding (AAC) profiles.| 189| typedef enum [OH_AVCProfile](#oh_avcprofile-1) [OH_AVCProfile](#oh_avcprofile) | Defines an enum for the Advanced Video Coding (AVC) profiles.| 190| typedef enum [OH_HEVCProfile](#oh_hevcprofile-1) [OH_HEVCProfile](#oh_hevcprofile) | Defines an enum for the High Efficiency Video Coding (HEVC) profiles.| 191| typedef enum [OH_AVOutputFormat](#oh_avoutputformat-1) [OH_AVOutputFormat](#oh_avoutputformat) | Defines an enum for the output file formats supported by a muxer.| 192| typedef enum [OH_AVSeekMode](#oh_avseekmode-1) [OH_AVSeekMode](#oh_avseekmode) | Defines an enum for the seek modes.| 193| typedef enum [OH_ScalingMode](#oh_scalingmode-1) [OH_ScalingMode](#oh_scalingmode) | Defines an enum for the scaling modes. This enum is used only in surface mode.| 194| typedef enum [OH_BitsPerSample](#oh_bitspersample-1) [OH_BitsPerSample](#oh_bitspersample) | Defines an enum for the number of audio bits for each coded sample.| 195| typedef enum [OH_ColorPrimary](#oh_colorprimary-1) [OH_ColorPrimary](#oh_colorprimary) | Defines an enum for the primary colors.| 196| typedef enum [OH_TransferCharacteristic](#oh_transfercharacteristic-1) [OH_TransferCharacteristic](#oh_transfercharacteristic) | Defines an enum for the transfer characteristics.| 197| typedef enum [OH_MatrixCoefficient](#oh_matrixcoefficient-1) [OH_MatrixCoefficient](#oh_matrixcoefficient) | Defines an enum for the matrix coefficients.| 198| typedef enum [OH_AVCLevel](#oh_avclevel-1) [OH_AVCLevel](#oh_avclevel) | Defines an enum for the AVC levels. | 199| typedef enum [OH_HEVCLevel](#oh_hevclevel-1) [OH_HEVCLevel](#oh_hevclevel) | Defines an enum for the HEVC levels. | 200| typedef enum [OH_TemporalGopReferenceMode](#oh_temporalgopreferencemode-1) [OH_TemporalGopReferenceMode](#oh_temporalgopreferencemode) | Defines an enum for the reference modes of temporal image groups. | 201 202 203### Enums 204 205| Name| Description| 206| -------- | -------- | 207| [AudioChannelSet](#audiochannelset) : uint64_t {<br>FRONT_LEFT = 1ULL << 0U,<br>FRONT_RIGHT = 1ULL << 1U,<br>FRONT_CENTER = 1ULL << 2U,<br>LOW_FREQUENCY = 1ULL << 3U,<br>BACK_LEFT = 1ULL << 4U,<br>BACK_RIGHT = 1ULL << 5U,<br>FRONT_LEFT_OF_CENTER = 1ULL << 6U,<br>FRONT_RIGHT_OF_CENTER = 1ULL << 7U,<br>BACK_CENTER = 1ULL << 8U,<br>SIDE_LEFT = 1ULL << 9U,<br>SIDE_RIGHT = 1ULL << 10U,<br>TOP_CENTER = 1ULL << 11U,<br>TOP_FRONT_LEFT = 1ULL << 12U,<br>TOP_FRONT_CENTER = 1ULL << 13U,<br>TOP_FRONT_RIGHT = 1ULL << 14U,<br>TOP_BACK_LEFT = 1ULL << 15U,<br>TOP_BACK_CENTER = 1ULL << 16U,<br>TOP_BACK_RIGHT = 1ULL << 17U,<br>STEREO_LEFT = 1ULL << 29U,<br>STEREO_RIGHT = 1ULL << 30U,<br>WIDE_LEFT = 1ULL << 31U,<br>WIDE_RIGHT = 1ULL << 32U,<br>SURROUND_DIRECT_LEFT = 1ULL << 33U,<br>SURROUND_DIRECT_RIGHT = 1ULL << 34U,<br>LOW_FREQUENCY_2 = 1ULL << 35U,<br>TOP_SIDE_LEFT = 1ULL << 36U,<br>TOP_SIDE_RIGHT = 1ULL << 37U,<br>BOTTOM_FRONT_CENTER = 1ULL << 38U,<br>BOTTOM_FRONT_LEFT = 1ULL << 39U,<br>BOTTOM_FRONT_RIGHT = 1ULL << 40U,<br>AMBISONICS_ACN0 = 1ULL << 41U,<br>AMBISONICS_ACN1 = 1ULL << 42U,<br>AMBISONICS_ACN2 = 1ULL << 43U,<br>AMBISONICS_ACN3 = 1ULL << 44U,<br>AMBISONICS_W = AMBISONICS_ACN0,<br>AMBISONICS_Y = AMBISONICS_ACN1,<br>AMBISONICS_Z = AMBISONICS_ACN2,<br>AMBISONICS_X = AMBISONICS_ACN3,<br>AMBISONICS_ACN4 = 1ULL << 45U,<br>AMBISONICS_ACN5 = 1ULL << 46U,<br>AMBISONICS_ACN6 = 1ULL << 47U,<br>AMBISONICS_ACN7 = 1ULL << 48U,<br>AMBISONICS_ACN8 = 1ULL << 49U,<br>AMBISONICS_ACN9 = 1ULL << 50U,<br>AMBISONICS_ACN10 = 1ULL << 51U,<br>AMBISONICS_ACN11 = 1ULL << 52U,<br>AMBISONICS_ACN12 = 1ULL << 53U,<br>AMBISONICS_ACN13 = 1ULL << 54U,<br>AMBISONICS_ACN14 = 1ULL << 55U,<br>AMBISONICS_ACN15 = 1ULL << 56U<br>} | Enumerates the audio channel sets. Each channel number is mapped to a variable of int64_t. (This function is deprecated in API version 11.)| 208| [AudioChannelLayout](#audiochannellayout) : uint64_t {<br>UNKNOWN_CHANNEL_LAYOUT = 0,<br>MONO = (AudioChannelSet::FRONT_CENTER),<br>STEREO = (AudioChannelSet::FRONT_LEFT \| AudioChannelSet::FRONT_RIGHT),<br>CH_2POINT1 = (STEREO \| AudioChannelSet::LOW_FREQUENCY),<br>CH_2_1 = (STEREO \| AudioChannelSet::BACK_CENTER),<br>SURROUND = (STEREO \| AudioChannelSet::FRONT_CENTER),<br>CH_3POINT1 = (SURROUND \| AudioChannelSet::LOW_FREQUENCY),<br>CH_4POINT0 = (SURROUND \| AudioChannelSet::BACK_CENTER),<br>CH_4POINT1 = (CH_4POINT0 \| AudioChannelSet::LOW_FREQUENCY),<br>CH_2_2 = (STEREO \| AudioChannelSet::SIDE_LEFT \| AudioChannelSet::SIDE_RIGHT),<br>QUAD = (STEREO \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),<br>CH_5POINT0 = (SURROUND \| AudioChannelSet::SIDE_LEFT \| AudioChannelSet::SIDE_RIGHT),<br>CH_5POINT1 = (CH_5POINT0 \| AudioChannelSet::LOW_FREQUENCY),<br>CH_5POINT0_BACK = (SURROUND \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),<br>CH_5POINT1_BACK = (CH_5POINT0_BACK \| AudioChannelSet::LOW_FREQUENCY),<br>CH_6POINT0 = (CH_5POINT0 \| AudioChannelSet::BACK_CENTER),<br>CH_6POINT0_FRONT = (CH_2_2 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \| AudioChannelSet::FRONT_RIGHT_OF_CENTER),<br>HEXAGONAL = (CH_5POINT0_BACK \| AudioChannelSet::BACK_CENTER),<br>CH_6POINT1 = (CH_5POINT1 \| AudioChannelSet::BACK_CENTER),<br>CH_6POINT1_BACK = (CH_5POINT1_BACK \| AudioChannelSet::BACK_CENTER),<br>CH_6POINT1_FRONT = (CH_6POINT0_FRONT \| AudioChannelSet::LOW_FREQUENCY),<br>CH_7POINT0 = (CH_5POINT0 \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),<br>CH_7POINT0_FRONT = (CH_5POINT0 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \| AudioChannelSet::FRONT_RIGHT_OF_CENTER),<br>CH_7POINT1 = (CH_5POINT1 \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),<br>CH_7POINT1_WIDE = (CH_5POINT1 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \| AudioChannelSet::FRONT_RIGHT_OF_CENTER),<br>CH_7POINT1_WIDE_BACK, CH_3POINT1POINT2 = (CH_3POINT1 \| AudioChannelSet::TOP_FRONT_LEFT \| AudioChannelSet::TOP_FRONT_RIGHT),<br>CH_5POINT1POINT2 = (CH_5POINT1 \| AudioChannelSet::TOP_SIDE_LEFT \| AudioChannelSet::TOP_SIDE_RIGHT),<br>CH_5POINT1POINT4, CH_7POINT1POINT2 = (CH_7POINT1 \| AudioChannelSet::TOP_SIDE_LEFT \| AudioChannelSet::TOP_SIDE_RIGHT),<br>CH_7POINT1POINT4, CH_9POINT1POINT4 = (CH_7POINT1POINT4 \| AudioChannelSet::WIDE_LEFT \| AudioChannelSet::WIDE_RIGHT),<br>CH_9POINT1POINT6 = (CH_9POINT1POINT4 \| AudioChannelSet::TOP_SIDE_LEFT \| AudioChannelSet::TOP_SIDE_RIGHT),<br>CH_10POINT2, CH_22POINT2, OCTAGONAL = (CH_5POINT0 \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_CENTER \| AudioChannelSet::BACK_RIGHT),<br>HEXADECAGONAL, STEREO_DOWNMIX = (AudioChannelSet::STEREO_LEFT \| AudioChannelSet::STEREO_RIGHT),<br>HOA_FIRST,<br>HOA_SECOND,<br>HOA_THIRD<br>} | Enumerates the types of the audio channel sets. The output format of the decoder is represented as the channel type of the codec.| 209| [OH_MediaType](#oh_mediatype-1) {<br>MEDIA_TYPE_AUD = 0,<br>MEDIA_TYPE_VID = 1,<br>MEDIA_TYPE_SUBTITILE = 2<br>} | Enumerates the media types.| 210| [OH_AACProfile](#oh_aacprofile-1) { AAC_PROFILE_LC = 0 } | Enumerates the AAC profiles.| 211| [OH_AVCProfile](#oh_avcprofile-1) {<br>AVC_PROFILE_BASELINE = 0,<br>AVC_PROFILE_HIGH = 4,<br>AVC_PROFILE_MAIN = 8<br>} | Enumerates the AVC profiles.| 212| [OH_HEVCProfile](#oh_hevcprofile-1) {<br>HEVC_PROFILE_MAIN = 0,<br>HEVC_PROFILE_MAIN_10 = 1,<br>HEVC_PROFILE_MAIN_STILL = 2,<br>HEVC_PROFILE_MAIN_10_HDR10 = 3,<br>HEVC_PROFILE_MAIN_10_HDR10_PLUS = 4<br>} | Enumerates the HEVC profiles.| 213| [OH_AVOutputFormat](#oh_avoutputformat-1) {<br>AV_OUTPUT_FORMAT_DEFAULT = 0,<br>AV_OUTPUT_FORMAT_MPEG_4 = 2,<br>AV_OUTPUT_FORMAT_M4A = 6,<br>AV_OUTPUT_FORMAT_AMR = 8,<br>AV_OUTPUT_FORMAT_MP3 = 9,<br>AV_OUTPUT_FORMAT_WAV = 10<br>} | Enumerates the output file formats supported by a muxer.| 214| [OH_AVSeekMode](#oh_avseekmode-1) {<br>SEEK_MODE_NEXT_SYNC = 0,<br>SEEK_MODE_PREVIOUS_SYNC,<br>SEEK_MODE_CLOSEST_SYNC<br>} | Enumerates the seek modes.| 215| [OH_ScalingMode](#oh_scalingmode-1) {<br>SCALING_MODE_SCALE_TO_WINDOW = 1,<br>SCALING_MODE_SCALE_CROP = 2<br>} | Enumerates the scaling modes.| 216| [OH_BitsPerSample](#oh_bitspersample-1) {<br>SAMPLE_U8 = 0, SAMPLE_S16LE = 1,<br>SAMPLE_S24LE = 2, SAMPLE_S32LE = 3,<br>SAMPLE_F32LE = 4, SAMPLE_U8P = 5,<br>SAMPLE_S16P = 6, SAMPLE_S24P = 7,<br>SAMPLE_S32P = 8, SAMPLE_F32P = 9,<br>INVALID_WIDTH = -1<br>} | Enumerates the number of audio bits for each coded sample.| 217| [OH_ColorPrimary](#oh_colorprimary-1) {<br>COLOR_PRIMARY_BT709 = 1,<br>COLOR_PRIMARY_UNSPECIFIED = 2,<br>COLOR_PRIMARY_BT470_M = 4,<br>COLOR_PRIMARY_BT601_625 = 5,<br>COLOR_PRIMARY_BT601_525 = 6,<br>COLOR_PRIMARY_SMPTE_ST240 = 7,<br>COLOR_PRIMARY_GENERIC_FILM = 8,<br>COLOR_PRIMARY_BT2020 = 9,<br>COLOR_PRIMARY_SMPTE_ST428 = 10,<br>COLOR_PRIMARY_P3DCI = 11,<br>COLOR_PRIMARY_P3D65 = 12<br>} | Enumerates the primary colors.| 218| [OH_TransferCharacteristic](#oh_transfercharacteristic-1) {<br>TRANSFER_CHARACTERISTIC_BT709 = 1,<br>TRANSFER_CHARACTERISTIC_UNSPECIFIED = 2,<br>TRANSFER_CHARACTERISTIC_GAMMA_2_2 = 4,<br>TRANSFER_CHARACTERISTIC_GAMMA_2_8 = 5,<br>TRANSFER_CHARACTERISTIC_BT601 = 6,<br>TRANSFER_CHARACTERISTIC_SMPTE_ST240 = 7,<br>TRANSFER_CHARACTERISTIC_LINEAR = 8,<br>TRANSFER_CHARACTERISTIC_LOG = 9,<br>TRANSFER_CHARACTERISTIC_LOG_SQRT = 10,<br>TRANSFER_CHARACTERISTIC_IEC_61966_2_4 = 11,<br>TRANSFER_CHARACTERISTIC_BT1361 = 12,<br>TRANSFER_CHARACTERISTIC_IEC_61966_2_1 = 13,<br>TRANSFER_CHARACTERISTIC_BT2020_10BIT = 14,<br>TRANSFER_CHARACTERISTIC_BT2020_12BIT = 15,<br>TRANSFER_CHARACTERISTIC_PQ = 16,<br>TRANSFER_CHARACTERISTIC_SMPTE_ST428 = 17,<br>TRANSFER_CHARACTERISTIC_HLG = 18<br>} | Enumerates the transfer characteristics.| 219| [OH_MatrixCoefficient](#oh_matrixcoefficient-1) {<br>MATRIX_COEFFICIENT_IDENTITY = 0,<br>MATRIX_COEFFICIENT_BT709 = 1,<br>MATRIX_COEFFICIENT_UNSPECIFIED = 2,<br>MATRIX_COEFFICIENT_FCC = 4,<br>MATRIX_COEFFICIENT_BT601_625 = 5,<br>MATRIX_COEFFICIENT_BT601_525 = 6, MATRIX_COEFFICIENT_SMPTE_ST240 = 7,<br>MATRIX_COEFFICIENT_YCGCO = 8,<br>MATRIX_COEFFICIENT_BT2020_NCL = 9,<br>MATRIX_COEFFICIENT_BT2020_CL = 10,<br>MATRIX_COEFFICIENT_SMPTE_ST2085 = 11,<br>MATRIX_COEFFICIENT_CHROMATICITY_NCL = 12,<br>MATRIX_COEFFICIENT_CHROMATICITY_CL = 13,<br>MATRIX_COEFFICIENT_ICTCP = 14<br>} | Enumerates the matrix coefficients.| 220| [OH_AVCLevel](#oh_avclevel-1) {<br>AVC_LEVEL_1 = 0, <br>AVC_LEVEL_1b = 1, <br>AVC_LEVEL_11 = 2, <br>AVC_LEVEL_12 = 3,<br>AVC_LEVEL_13 = 4, <br>AVC_LEVEL_2 = 5, <br>AVC_LEVEL_21 = 6, <br>AVC_LEVEL_22 = 7,<br>AVC_LEVEL_3 = 8, <br>AVC_LEVEL_31 = 9, <br>AVC_LEVEL_32 = 10, <br>AVC_LEVEL_4 = 11,<br>AVC_LEVEL_41 = 12, <br>AVC_LEVEL_42 = 13, <br>AVC_LEVEL_5 = 14, <br>AVC_LEVEL_51 = 15, <br>AVC_LEVEL_52 = 16, <br>AVC_LEVEL_6 = 17, <br>AVC_LEVEL_61 = 18, <br>AVC_LEVEL_62 = 19<br>} | Enumerates the AVC levels. | 221| [OH_HEVCLevel](#oh_hevclevel-1) {<br>HEVC_LEVEL_1 = 0, <br>HEVC_LEVEL_2 = 1, <br>HEVC_LEVEL_21 = 2, <br>HEVC_LEVEL_3 = 3,<br>HEVC_LEVEL_31 = 4, <br>HEVC_LEVEL_4 = 5, <br>HEVC_LEVEL_41 = 6, <br>HEVC_LEVEL_5 = 7,<br>HEVC_LEVEL_51 = 8, <br>HEVC_LEVEL_52 = 9, <br>HEVC_LEVEL_6 = 10, <br>HEVC_LEVEL_61 = 11,<br>HEVC_LEVEL_62 = 12<br>} | Enumerates the HEVC levels. | 222| [OH_TemporalGopReferenceMode](#oh_temporalgopreferencemode-1) { <br>ADJACENT_REFERENCE = 0, <br>JUMP_REFERENCE = 1, <br>UNIFORMLY_SCALED_REFERENCE = 2 <br>} | Enumerates the reference modes of temporal image groups. | 223 224 225### Variables 226 227| Name| Description| 228| -------- | -------- | 229| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_AAC](#oh_avcodec_mimetype_audio_aac) | Pointer to the key that describes the MIME type of the AAC audio codec.| 230| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_FLAC](#oh_avcodec_mimetype_audio_flac) | Pointer to the key that describes the MIME type of the Free Lossless Audio Codec (FLAC) audio codec.| 231| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_OPUS](#oh_avcodec_mimetype_audio_opus) | Pointer to the key that describes the MIME type of the Opus audio codec. <!--Del-->(This specification is not available yet.)<!--DelEnd--> | 232| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_G711MU](#oh_avcodec_mimetype_audio_g711mu) | Pointer to the key that describes the MIME type of the G.711 mu-law audio codec.| 233| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_VORBIS](#oh_avcodec_mimetype_audio_vorbis) | Pointer to the key that describes the MIME type of the Vorbis audio decoder.| 234| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_MPEG](#oh_avcodec_mimetype_audio_mpeg) | Pointer to the key that describes the MIME type of the MP3 audio decoder.| 235| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_VIVID](#oh_avcodec_mimetype_audio_vivid) | Pointer to the key that describes the MIME type of the Audio Vivid audio decoder. <!--Del-->(This specification is not available yet.)<!--DelEnd--> | 236| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_AMR_NB](#oh_avcodec_mimetype_audio_amr_nb) | Pointer to the key that describes the MIME type of the AMR-NB audio decoder.| 237| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_AMR_WB](#oh_avcodec_mimetype_audio_amr_wb) | Pointer to the key that describes the MIME type of the AMR-WB audio decoder.| 238| const char \* [OH_AVCODEC_MIMETYPE_AUDIO_APE](#oh_avcodec_mimetype_audio_ape) |Pointer to the key that describes the MIME type of the APE audio decoder. | 239| const char \* [OH_AVCODEC_MIMETYPE_VIDEO_HEVC](#oh_avcodec_mimetype_video_hevc) | Pointer to the key that describes the MIME type of the HEVC (H.265) video codec.| 240| const char \* [OH_AVCODEC_MIMETYPE_VIDEO_AVC](#oh_avcodec_mimetype_video_avc) | Pointer to the key that describes the MIME type of the AVC (H.264) video codec.| 241| const char \* [OH_AVCODEC_MIMETYPE_VIDEO_MPEG4](#oh_avcodec_mimetype_video_mpeg4) | Pointer to the key that describes the MIME type of the MPEG4 video encoder, which is used only for muxing MPEG4 video streams.| 242| const char \* [OH_AVCODEC_MIMETYPE_IMAGE_JPG](#oh_avcodec_mimetype_image_jpg) | Pointer to the key that describes the MIME type of the JPG image encoder, which is used only for muxing JPG covers.| 243| const char \* [OH_AVCODEC_MIMETYPE_IMAGE_PNG](#oh_avcodec_mimetype_image_png) | Pointer to the key that describes the MIME type of the PNG image encoder, which is used only for muxing PNG covers.| 244| const char \* [OH_AVCODEC_MIMETYPE_IMAGE_BMP](#oh_avcodec_mimetype_image_bmp) | Pointer to the key that describes the MIME type of the BMP image encoder, which is used only for muxing BMP covers.| 245| const char \* [OH_AVCODEC_MIMETYPE_SUBTITLE_WEBVTT](#oh_avcodec_mimetype_subtitle_webvtt) |Pointer to the key that describes the MIME type of the WEBVTT subtitle demuxer. | 246| const char \* [OH_AVCODEC_MIMETYPE_SUBTITLE_SRT](#oh_avcodec_mimetype_subtitle_srt) |Pointer to the key that describes the MIME type of the SRT subtitle demuxer. | 247| const char \* [OH_FEATURE_PROPERTY_KEY_VIDEO_ENCODER_MAX_LTR_FRAME_COUNT](#oh_feature_property_key_video_encoder_max_ltr_frame_count) | Pointer to the key that describes the maximum number of LTR frames obtained during video encoding. The value type is int32_t. | 248| const char \* [OH_MD_KEY_CODEC_CONFIG](#oh_md_key_codec_config) | Pointer to the key that describes codec-specific data. In the case of video, data carried in **SPS/PPS** is transferred. In the case of audio, data carried in **extraData** is transferred. The value type is uint8_t\*. <!--Del-->(This key is not supported yet for the video codec.)<!--DelEnd--> | 249| const char \* [OH_MD_MAX_INPUT_BUFFER_COUNT](#oh_md_max_input_buffer_count) | Pointer to the key that describes the maximum number of input buffers. The value type is int32_t.| 250| const char \* [OH_MD_MAX_OUTPUT_BUFFER_COUNT](#oh_md_max_output_buffer_count) | Pointer to the key that describes the maximum number of output buffers. The value type is int32_t.| 251| const char \* [OH_MD_KEY_BITRATE](#oh_md_key_bitrate) | Pointer to the key that describes the bit rate. The value type is int64_t.| 252| const char \* [OH_MD_KEY_PROFILE](#oh_md_key_profile) | Pointer to the key that describes the encoding grading. The value type is int32_t. For details, see [OH_AVCProfile](#oh_avcprofile), [OH_HEVCProfile](#oh_hevcprofile), and [OH_AACProfile](#oh_aacprofile).| 253| const char \* [OH_MD_KEY_MAX_INPUT_SIZE](#oh_md_key_max_input_size) | Pointer to the key that describes the maximum size of an input stream to decode. The value type is int32_t.| 254| const char \* [OH_ED_KEY_TIME_STAMP](#oh_ed_key_time_stamp) | Pointer to the key that describes the surface buffer timestamp. The value is of the int64_t type. <!--Del-->(This key is not supported yet.)<!--DelEnd--> | 255| const char \* [OH_ED_KEY_EOS](#oh_ed_key_eos) | Pointer to the key that describes the end of stream for the surface buffer. The value type is int32_t. <!--Del-->(This key is not supported yet.)<!--DelEnd--> | 256| const char \* [OH_MD_KEY_WIDTH](#oh_md_key_width) | Pointer to the key that describes the video width. The value type is int32_t.| 257| const char \* [OH_MD_KEY_HEIGHT](#oh_md_key_height) | Pointer to the key that describes the video height. The value type is int32_t.| 258| const char \* [OH_MD_KEY_PIXEL_FORMAT](#oh_md_key_pixel_format) | Pointer to the key that describes the video pixel format. The value type is int32_t. For details, see [OH_AVPixelFormat](_core.md#oh_avpixelformat).| 259| const char \* [OH_MD_KEY_FRAME_RATE](#oh_md_key_frame_rate) | Pointer to the key that describes the video frame rate. The value type is double.| 260| const char \* [OH_MD_KEY_ROTATION](#oh_md_key_rotation) | Pointer to the key that describes the rotation angle of the surface. The value type is int32_t, and the value range is {0, 90, 180, 270}. The default value is 0. This key is used only for video decoding in surface mode.| 261| const char \* [OH_MD_KEY_RANGE_FLAG](#oh_md_key_range_flag) | Pointer to the key that describes the video YUV value range flag. The value type is int32_t. The value **1** means a full range, and **0** means a limited range.| 262| const char \* [OH_MD_KEY_COLOR_PRIMARIES](#oh_md_key_color_primaries) | Pointer to the key that describes the video primary color. The value type is int32_t. For details, see [OH_ColorPrimary](#oh_colorprimary). The video primary color complies with Table 2 in the H.273 standard.| 263| const char \* [OH_MD_KEY_TRANSFER_CHARACTERISTICS](#oh_md_key_transfer_characteristics) | Pointer to the key that describes the video transfer characteristics. The value type is int32_t. For details, see [OH_TransferCharacteristic](#oh_transfercharacteristic). The video transfer characteristics comply with Table 3 in the H.273 standard.| 264| const char \* [OH_MD_KEY_MATRIX_COEFFICIENTS](#oh_md_key_matrix_coefficients) | Pointer to the key that describes the video matrix coefficient. The value type is int32_t. For details, see [OH_MatrixCoefficient](#oh_matrixcoefficient). The video matrix coefficient complies with Table 4 in the H.273 standard.| 265| const char \* [OH_MD_KEY_SCALING_MODE](#oh_md_key_scaling_mode) | Pointer to the key that describes the video scaling mode. The value type is int32_t. For details, see [OH_ScalingMode](#oh_scalingmode). This key is optional and is used only for video decoding in surface mode. You are advised to set the scaling mode by calling [OH_NativeWindow_NativeWindowSetScalingModeV2](../apis-arkgraphics2d/_native_window.md).| 266| const char \* [OH_MD_KEY_VIDEO_CROP_TOP](#oh_md_key_video_crop_top) | Pointer to the key that describes the top coordinate (y) of the cropped rectangle. The value type is int32_t. | 267| const char \* [OH_MD_KEY_VIDEO_CROP_BOTTOM](#oh_md_key_video_crop_bottom) | Pointer to the key that describes the bottom coordinate (y) of the cropped rectangle. The value type is int32_t. | 268| const char \* [OH_MD_KEY_VIDEO_CROP_LEFT](#oh_md_key_video_crop_left) | Pointer to the key that describes the left coordinate (x) of the cropped rectangle. The value type is int32_t. | 269| const char \* [OH_MD_KEY_VIDEO_CROP_RIGHT](#oh_md_key_video_crop_right) | Pointer to the key that describes the right coordinate (x) of the cropped rectangle. The value type is int32_t.| 270| const char \* [OH_MD_KEY_VIDEO_STRIDE](#oh_md_key_video_stride) | Pointer to the key that describes the stride of the video frame. The value type is int32_t. | 271| const char \* [OH_MD_KEY_VIDEO_SLICE_HEIGHT](#oh_md_key_video_slice_height) | Pointer to the key that describes the height of the video frame. The value type is int32_t. | 272| const char \* [OH_MD_KEY_VIDEO_PIC_WIDTH](#oh_md_key_video_pic_width) | Pointer to the key that describes the width of the video frame. The value type is int32_t. | 273| const char \* [OH_MD_KEY_VIDEO_PIC_HEIGHT](#oh_md_key_video_pic_height) | Pointer to the key that describes the height of the video frame. The value type is int32_t. | 274| const char \* [OH_MD_KEY_VIDEO_ENABLE_LOW_LATENCY](#oh_md_key_video_enable_low_latency) | Pointer to the key that describes the enabled status of low-latency video codec. The value type is int32_t. The value **1** means that low-latency video codec is enabled, and **0** means the opposite. If enabled, the input and output data held by the video encoder or decoder does not exceed the amount required by the codec standard. | 275| const char \* [OH_MD_KEY_VIDEO_ENCODE_BITRATE_MODE](#oh_md_key_video_encode_bitrate_mode) | Pointer to the key that describes the video encoding bit rate mode. The value type is int32_t. For details, see [OH_VideoEncodeBitrateMode](_video_encoder.md#oh_videoencodebitratemode).| 276| const char \* [OH_MD_KEY_QUALITY](#oh_md_key_quality) | Pointer to the key that describes the required encoding quality. The value type is int32_t. This key applies only to encoders configured in constant quality mode.| 277| const char \* [OH_MD_KEY_REQUEST_I_FRAME](#oh_md_key_request_i_frame) | Pointer to the key that describes the request for immediate encoding of I-frames. The value type is int32_t.| 278| const char \* [OH_MD_KEY_I_FRAME_INTERVAL](#oh_md_key_i_frame_interval) | Pointer to the key that describes the key frame interval, in milliseconds. The value type is int32_t. This key is optional and is used only for video encoding.| 279| const char \* [OH_MD_KEY_VIDEO_ENCODER_ENABLE_TEMPORAL_SCALABILITY](#oh_md_key_video_encoder_enable_temporal_scalability) | Pointer to the key that describes the enabled status of temporal scalability. The value type is int32_t. The value **1** means temporal scalability is enabled, and **0** means the opposite. | 280| const char \* [OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_SIZE](#oh_md_key_video_encoder_temporal_gop_size) | Pointer to the key that describes the size of a temporal image group. The value type is int32_t. This key is valid only when temporal scalability is enabled. | 281| const char \* [OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_REFERENCE_MODE](#oh_md_key_video_encoder_temporal_gop_reference_mode) | Pointer to the key that describes the reference mode in a temporal image group. The value type is int32_t. For details, see [OH_TemporalGopReferenceMode](#oh_temporalgopreferencemode). This key is valid only when temporal scalability is enabled. | 282| const char \* [OH_MD_KEY_VIDEO_ENCODER_LTR_FRAME_COUNT](#oh_md_key_video_encoder_ltr_frame_count) | Pointer to the key that describes the number of LTR frames. The value type is int32_t. The value must be within the supported value range. This key is optional and is used only for video encoding. | 283| const char \* [OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_MARK_LTR](#oh_md_key_video_encoder_per_frame_mark_ltr) | Pointer to the key that describes the key that marks the current frame as an LTR frame. The value type is int32_t. The value **1** means that the frame is marked as an LTR frame, and **0** means the opposite. This key is optional and is used only for video encoding. | 284| const char \* [OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_USE_LTR](#oh_md_key_video_encoder_per_frame_use_ltr) | Pointer to the key that describes the LTR frame referenced by the current frame. The value type is int32_t. This key is optional and is used only for video encoding. | 285| const char \* [OH_MD_KEY_VIDEO_PER_FRAME_IS_LTR](#oh_md_key_video_per_frame_is_ltr) | Pointer to the key that specifies whether the frame corresponding to the stream output from the current OH_AVBuffer is marked as an LTR frame. The value type is int32_t. The value **1** means that the frame is an LTR frame, and **0** means the opposite. This key is optional and is used only for video encoding. | 286| const char \* [OH_MD_KEY_VIDEO_PER_FRAME_POC](#oh_md_key_video_per_frame_poc) | Pointer to the key that describes the POC of the frame. The value type is int32_t. This key is optional and is used only for video encoding. | 287| const char \* [OH_MD_KEY_VIDEO_ENCODER_QP_MAX](#oh_md_key_video_encoder_qp_max) | Pointer to the key that describes the maximum QP allowed by the video encoder. The value type is int32_t. | 288| const char \* [OH_MD_KEY_VIDEO_ENCODER_QP_MIN](#oh_md_key_video_encoder_qp_min) | Pointer to the key that describes the minimum QP allowed by the video encoder. The value type is int32_t. | 289| const char \* [OH_MD_KEY_VIDEO_ENCODER_QP_AVERAGE](#oh_md_key_video_encoder_qp_average) | Pointer to the key that describes the average QP of video frames. The value type is int32_t.| 290| const char \* [OH_MD_KEY_VIDEO_ENCODER_MSE](#oh_md_key_video_encoder_mse) |Pointer to the key that describes the MSE of video frames. The value type is double. | 291| const char \* [OH_MD_KEY_VIDEO_DECODER_OUTPUT_COLOR_SPACE](#oh_md_key_video_decoder_output_color_space) | Pointer to the key that describes the output color space of the video decoder. The value type is int32_t. The supported value is **OH_COLORSPACE_BT709_LIMIT**.| 292| const char \* [OH_MD_KEY_AUDIO_SAMPLE_FORMAT](#oh_md_key_audio_sample_format) | Pointer to the key that describes the original audio format. The value type is int32_t.| 293| const char \* [OH_MD_KEY_AUD_CHANNEL_COUNT](#oh_md_key_aud_channel_count) | Pointer to the key that describes the number of audio channels. The value type is int32_t.| 294| const char \* [OH_MD_KEY_AUD_SAMPLE_RATE](#oh_md_key_aud_sample_rate) | Pointer to the key that describes the audio sampling rate. The value type is int32_t.| 295| const char \* [OH_MD_KEY_AUDIO_COMPRESSION_LEVEL](#oh_md_key_audio_compression_level) | Pointer to the key that describes the audio codec compression level. The value type is int32_t type. This key is used only for audio encoding.| 296| const char \* [OH_MD_KEY_CHANNEL_LAYOUT](#oh_md_key_channel_layout) | Pointer to the key that describes the required encoding channel layout. The value type is int64_t. This key applies only to encoders.| 297| const char \* [OH_MD_KEY_BITS_PER_CODED_SAMPLE](#oh_md_key_bits_per_coded_sample) | Pointer to the key that describes the number of bits for each coded sample. The value type is int32_t. This key applies to FLAC encoders. For details, see [OH_BitsPerSample](#oh_bitspersample).| 298| const char \* [OH_MD_KEY_SBR](#oh_md_key_sbr) | Pointer to the key that describes the AAC SBR format. The value type is int32_t. This key applies to AAC encoders.| 299| const char \* [OH_MD_KEY_COMPLIANCE_LEVEL](#oh_md_key_compliance_level) | Pointer to the key that describes the FLAC compliance level. The value type is int32_t. This key is used only for audio encoding.| 300| const char \* [OH_MD_KEY_AAC_IS_ADTS](#oh_md_key_aac_is_adts) | Pointer to the key that describes the AAC format, which can be ADTS or LATM. The value type is int32_t. This key applies to AAC decoders.| 301| const char \* [OH_MD_KEY_IDENTIFICATION_HEADER](#oh_md_key_identification_header) | Pointer to the key that describes the Vorbis identification header. The value type is uint8_t. This key applies only to Vorbis decoders.| 302| const char \* [OH_MD_KEY_SETUP_HEADER](#oh_md_key_setup_header) | Pointer to the key that describes the Vorbis setup header. The value type is uint8_t. This key applies only to Vorbis decoders.| 303| const char \* [OH_MD_KEY_AUDIO_OBJECT_NUMBER](#oh_md_key_audio_object_number) | Pointer to the key that describes the number of audio objects. The value type is int32_t. This key is used only for Audio Vivid decoding.| 304| const char \* [OH_MD_KEY_AUDIO_VIVID_METADATA](#oh_md_key_audio_vivid_metadata) | Pointer to the key that describes the Audio Vivid metadata. The value type is uint8_t\*. This key is used only for Audio Vivid decoding.| 305| const char \* [OH_MD_KEY_VIDEO_IS_HDR_VIVID](#oh_md_key_video_is_hdr_vivid) | Pointer to the key that describes whether the video track in a media file is HDR Vivid. The value type is int32_t. This key is used for both muxing and demuxing.| 306| const char \* [OH_MD_KEY_START_TIME](#oh_md_key_start_time) | Pointer to the key that describes the start time of the first frame in a media file. The value type is int64_t. | 307| const char \* [OH_MD_KEY_TRACK_START_TIME](#oh_md_key_track_start_time) | Pointer to the key that describes the track start time. The value type is int64_t. | 308| const char \* [OH_MD_KEY_TRACK_TYPE](#oh_md_key_track_type) | Pointer to the key that describes the track type in a media file. The value type is int32_t. For details, see [OH_MediaType](#oh_mediatype-1).| 309| const char \* [OH_MD_KEY_DURATION](#oh_md_key_duration) | Pointer to the key that describes the duration in a media file. The value type is int64_t.| 310| const char \* [OH_MD_KEY_TITLE](#oh_md_key_title) | Pointer to the key that describes the title in a media file. The value type is string.| 311| const char \* [OH_MD_KEY_ARTIST](#oh_md_key_artist) | Pointer to the key that describes the lyrics in a media file. The value type is string.| 312| const char \* [OH_MD_KEY_ALBUM](#oh_md_key_album) | Pointer to the key that describes the album in a media file. The value type is string.| 313| const char \* [OH_MD_KEY_ALBUM_ARTIST](#oh_md_key_album_artist) | Pointer to the key that describes the album artist of the input media. The value type is string.| 314| const char \* [OH_MD_KEY_DATE](#oh_md_key_date) | Pointer to the key that describes the date in a media file, for example, 2024. The value type is string.| 315| const char \* [OH_MD_KEY_COMMENT](#oh_md_key_comment) | Pointer to the key that describes the comment in a media file. The value type is string.| 316| const char \* [OH_MD_KEY_GENRE](#oh_md_key_genre) | Pointer to the key that describes the genre in a media file. The value type is string.| 317| const char \* [OH_MD_KEY_COPYRIGHT](#oh_md_key_copyright) | Pointer to the key that describes the copyright in a media file. The value type is string.| 318| const char \* [OH_MD_KEY_LANGUAGE](#oh_md_key_language) | Pointer to the key that describes the language in a media file. The value type is string.| 319| const char \* [OH_MD_KEY_DESCRIPTION](#oh_md_key_description) | Pointer to the key that describes the description in a media file. The value type is string.| 320| const char \* [OH_MD_KEY_LYRICS](#oh_md_key_lyrics) | Pointer to the key that describes the lyrics in a media file. The value type is string.| 321| const char \* [OH_MD_KEY_TRACK_COUNT](#oh_md_key_track_count) | Pointer to the key that describes the number of tracks in a media file. The value type is int32_t.| 322| const char \* [OH_MD_KEY_BUFFER_DURATION](#oh_md_key_buffer_duration) | Pointer to the key that describes the duration corresponding to the audio, video, or subtitle sample carried in AVBuffer, in microseconds. The value type is int64_t. | 323| const char \* [OH_MD_KEY_DECODING_TIMESTAMP](#oh_md_key_decoding_timestamp) | Pointer to the key that describes the decoding timestamp corresponding to the audio, video, or subtitle sample carried in AVBuffer, in microseconds. The value type is int64_t. | 324| const char \* [OH_MD_KEY_CODEC_MIME](#oh_md_key_codec_mime) | Pointer to the key that describes the MIME type of the codec. The value type is string.| 325| const char \* [OH_MD_KEY_VIDEO_SAR](#oh_md_key_video_sar) | Pointer to the key that describes the aspect ratio of the sample. The value type is double.| 326 327 328## Type Description 329 330 331### OH_AACProfile 332 333``` 334typedef enum OH_AACProfile OH_AACProfile 335``` 336 337**Description** 338 339Defines an enum for the AAC profiles. 340 341**System capability**: SystemCapability.Multimedia.Media.CodecBase 342 343**Since**: 9 344 345 346### OH_AVCLevel 347 348``` 349typedef enum OH_AVCLevel OH_AVCLevel 350``` 351**Description** 352 353Defines an enum for the AVC levels. 354 355**System capability**: SystemCapability.Multimedia.Media.CodecBase 356 357**Since**: 12 358 359 360### OH_AVCodec 361 362``` 363typedef struct OH_AVCodec OH_AVCodec 364``` 365**Description** 366 367Defines a struct for a native object for the audio and video codec interface. 368 369**Since**: 9 370 371 372### OH_AVCodecAsyncCallback 373 374``` 375typedef struct OH_AVCodecAsyncCallback OH_AVCodecAsyncCallback 376``` 377 378**Description** 379 380Defines a struct for all the asynchronous callback function pointers of an **OH_AVCodec** instance. To ensure the normal running of **OH_AVCodec**, you must register the instance of this struct with the **OH_AVCodec** instance and process the information reported by the callback function. 381 382**System capability**: SystemCapability.Multimedia.Media.CodecBase 383 384**Since**: 9 385 386**Deprecated from**: 11 387 388**Substitute**: [OH_AVCodecCallback](#oh_avcodeccallback) 389 390**Parameters** 391 392| Name| Description| 393| -------- | -------- | 394| onError | Callback used to report a codec operation error. For details, see [OH_AVCodecOnError](#oh_avcodeconerror).| 395| onStreamChanged | Callback used to report a codec stream change. For details, see [OH_AVCodecOnStreamChanged](#oh_avcodeconstreamchanged).| 396| onNeedInputData | Callback used to report input data required. For details, see [OH_AVCodecOnNeedInputData](#oh_avcodeconneedinputdata).| 397| onNeedOutputData | Callback used to report output data generated. For details, see [OH_AVCodecOnNewOutputData](#oh_avcodeconnewoutputdata).| 398 399 400### OH_AVCodecCallback 401 402``` 403typedef struct OH_AVCodecCallback OH_AVCodecCallback 404``` 405 406**Description** 407 408Defines a struct for all the asynchronous callback function pointers of an **OH_AVCodec** instance. To ensure the normal running of **OH_AVCodec**, you must register the instance of this struct with the **OH_AVCodec** instance and process the information reported by the callback function. 409 410**System capability**: SystemCapability.Multimedia.Media.CodecBase 411 412**Since**: 11 413 414**Parameters** 415 416| Name| Description| 417| -------- | -------- | 418| onError | Callback used to report a codec operation error. For details, see [OH_AVCodecOnError](#oh_avcodeconerror).| 419| onStreamChanged | Callback used to report a codec stream change. For details, see [OH_AVCodecOnStreamChanged](#oh_avcodeconstreamchanged).| 420| onNeedInputBuffer | Callback used to report input data required. For details, see [OH_AVCodecOnNeedInputBuffer](#oh_avcodeconneedinputbuffer).| 421| onNewOutputBuffer | Callback used to report output data generated. For details, see [OH_AVCodecOnNewOutputBuffer](#oh_avcodeconnewoutputbuffer).| 422 423 424### OH_AVCodecOnError 425 426``` 427typedef void(* OH_AVCodecOnError) (OH_AVCodec *codec, int32_t errorCode, void *userData) 428``` 429 430**Description** 431 432Defines the pointer to the function that is called to report error information when an error occurs during the running of an **OH_AVCodec** instance. 433 434| Use Case| Error Code| 435| -------- | -------- | 436| Audio encoding/decoding| **AV_ERR_DRM_DECRYPT_FAILED**: DRM decryption failed. | 437| Video encoding and decoding| **AV_ERROR_NO_MEMORY**: System resources are insufficient.<br>**AV_ERROR_UNKNOWN**: An unknown error occurs. Analyze the error based on specific logs.<br>**AV_ERR_SERVICE_DIED**: The service is dead. | 438| Video decoding| **AV_ERR_VIDEO_UNSUPPORTED_COLOR_SPACE_CONVERSION**: The current input does not support CSC. | 439<!--RP1--><!--RP1End--> 440 441**System capability**: SystemCapability.Multimedia.Media.CodecBase 442 443**Since**: 9 444 445**Parameters** 446 447| Name| Description| 448| -------- | -------- | 449| codec | Pointer to an **OH_AVCodec** instance. | 450| errorCode | Error code. | 451| userData | Pointer to the data on which the caller depends when executing the callback. | 452 453 454### OH_AVCodecOnNeedInputBuffer 455 456``` 457typedef void(* OH_AVCodecOnNeedInputBuffer) (OH_AVCodec *codec, uint32_t index, OH_AVBuffer *buffer, void *userData) 458``` 459 460**Description** 461 462Defines the pointer to the function that is called when new input data is required during the running of an **OH_AVCodec** instance. The function carries a buffer to fill in new input data. 463 464**System capability**: SystemCapability.Multimedia.Media.CodecBase 465 466**Since**: 11 467 468**Parameters** 469 470| Name| Description| 471| -------- | -------- | 472| codec | Pointer to an **OH_AVCodec** instance. | 473| index | Index of the new input buffer. | 474| buffer | Pointer to the data to fill in the new input buffer. | 475| userData | Pointer to the data on which the caller depends when executing the callback. | 476 477 478### OH_AVCodecOnNeedInputData 479 480``` 481typedef void(* OH_AVCodecOnNeedInputData) (OH_AVCodec *codec, uint32_t index, OH_AVMemory *data, void *userData) 482``` 483 484**Description** 485 486Defines the pointer to the function that is called when new input data is required during the running of an **OH_AVCodec** instance. The function carries a buffer to fill in new input data. 487 488**System capability**: SystemCapability.Multimedia.Media.CodecBase 489 490**Since**: 9 491 492**Deprecated from**: 11 493 494**Substitute**: [OH_AVCodecOnNeedInputBuffer](#oh_avcodeconneedinputbuffer) 495 496**Parameters** 497 498| Name| Description| 499| -------- | -------- | 500| codec | Pointer to an **OH_AVCodec** instance. | 501| index | Index of the new input buffer. | 502| data | Pointer to the data to fill in the new input buffer. | 503| userData | Pointer to the data on which the caller depends when executing the callback. | 504 505 506### OH_AVCodecOnNewOutputBuffer 507 508``` 509typedef void(* OH_AVCodecOnNewOutputBuffer) (OH_AVCodec *codec, uint32_t index, OH_AVBuffer *buffer, void *userData) 510``` 511 512**Description** 513 514Defines the pointer to the function that is called when new output data is generated during the running of an **OH_AVCodec** instance. The function carries a buffer filled with new output data. 515 516**System capability**: SystemCapability.Multimedia.Media.CodecBase 517 518**Since**: 11 519 520**Parameters** 521 522| Name| Description| 523| -------- | -------- | 524| codec | Pointer to an **OH_AVCodec** instance. | 525| index | Index of the new output buffer. | 526| buffer | Pointer to the data filled in the new output buffer. | 527| userData | Pointer to the data on which the caller depends when executing the callback. | 528 529 530### OH_AVCodecOnNewOutputData 531 532``` 533typedef void(* OH_AVCodecOnNewOutputData) (OH_AVCodec *codec, uint32_t index, OH_AVMemory *data, OH_AVCodecBufferAttr *attr, void *userData) 534``` 535 536**Description** 537 538Defines the pointer to the function that is called when new output data is generated during the running of an **OH_AVCodec** instance. The function carries a buffer filled with new output data. Note that the lifecycle of the pointer to the **OH_AVCodecBufferAttr** instance is valid only when the function pointer is being called. Do not access the pointer to the instance after the function pointer is called. 539 540**System capability**: SystemCapability.Multimedia.Media.CodecBase 541 542**Since**: 9 543 544**Deprecated from**: 11 545 546**Substitute**: [OH_AVCodecOnNewOutputBuffer](#oh_avcodeconnewoutputbuffer) 547 548**Parameters** 549 550| Name| Description| 551| -------- | -------- | 552| codec | Pointer to an **OH_AVCodec** instance. | 553| index | Index of the new output buffer. | 554| data | Pointer to the data filled in the new output buffer. | 555| attr | Pointer to the description information about the new output buffer. For details, see **OH_AVCodecBufferAttr**. | 556| userData | Pointer to the data on which the caller depends when executing the callback. | 557 558 559### OH_AVCodecOnStreamChanged 560 561``` 562typedef void(* OH_AVCodecOnStreamChanged) (OH_AVCodec *codec, OH_AVFormat *format, void *userData) 563``` 564 565**Description** 566 567Defines the pointer to the function that is called to report the new stream description when the resolution of the input stream being decoded or the output stream that has been encoded changes. Note that the lifecycle of the pointer to the **OH_AVFormat** instance is valid only when the function pointer is being called. Do not access the pointer to the instance after the function pointer is called. 568 569**System capability**: SystemCapability.Multimedia.Media.CodecBase 570 571**Since**: 9 572 573**Parameters** 574 575| Name| Description| 576| -------- | -------- | 577| codec | Pointer to an **OH_AVCodec** instance. | 578| format | Pointer to the description information about the new output stream. | 579| userData | Pointer to the data on which the caller depends when executing the callback. | 580 581 582### OH_AVCProfile 583 584``` 585typedef enum OH_AVCProfile OH_AVCProfile 586``` 587 588**Description** 589 590Defines an enum for the AVC profiles. 591 592**System capability**: SystemCapability.Multimedia.Media.CodecBase 593 594**Since**: 9 595 596 597### OH_AVDataSource 598 599``` 600typedef struct OH_AVDataSource OH_AVDataSource 601``` 602 603**Description** 604 605Defines a struct for a user-defined data source. 606 607**System capability**: SystemCapability.Multimedia.Media.CodecBase 608 609**Since**: 12 610 611 612### OH_AVDataSourceReadAt 613 614``` 615typedef int32_t(* OH_AVDataSourceReadAt) (OH_AVBuffer *data, int32_t length, int64_t pos) 616``` 617 618**Description** 619 620Defines a function pointer used to provide the capability of obtaining user-defined media data. 621 622**System capability**: SystemCapability.Multimedia.Media.CodecBase 623 624**Since**: 12 625 626**Parameters** 627 628| Name| Description| 629| -------- | -------- | 630| data | Buffer to be filled in. | 631| length | Length of the data to read. | 632| pos | Offset from which the data is read. | 633 634**Returns** 635 636Actual length of the data read to the buffer. 637 638 639### OH_AVOutputFormat 640 641``` 642typedef enum OH_AVOutputFormat OH_AVOutputFormat 643``` 644 645**Description** 646 647Defines an enum for the output file formats supported by a muxer. 648 649**System capability**: SystemCapability.Multimedia.Media.CodecBase 650 651**Since**: 10 652 653 654### OH_AVSeekMode 655 656``` 657typedef enum OH_AVSeekMode OH_AVSeekMode 658``` 659 660**Description** 661 662Defines an enum for the seek modes. 663 664**System capability**: SystemCapability.Multimedia.Media.CodecBase 665 666**Since**: 10 667 668 669### OH_BitsPerSample 670 671``` 672typedef enum OH_BitsPerSample OH_BitsPerSample 673``` 674 675**Description** 676 677Defines an enum for the number of audio bits for each coded sample. 678 679**System capability**: SystemCapability.Multimedia.Media.CodecBase 680 681**Since**: 10 682 683 684### OH_ColorPrimary 685 686``` 687typedef enum OH_ColorPrimary OH_ColorPrimary 688``` 689 690**Description** 691 692Defines an enum for the primary colors. 693 694**System capability**: SystemCapability.Multimedia.Media.CodecBase 695 696**Since**: 10 697 698 699### OH_HEVCLevel 700 701``` 702typedef enum OH_HEVCLevel OH_HEVCLevel 703``` 704 705**Description** 706 707Defines an enum for the HEVC levels. 708 709**System capability**: SystemCapability.Multimedia.Media.CodecBase 710 711**Since**: 12 712 713 714### OH_HEVCProfile 715 716``` 717typedef enum OH_HEVCProfile OH_HEVCProfile 718``` 719 720**Description** 721 722Defines an enum for the HEVC profiles. 723 724**System capability**: SystemCapability.Multimedia.Media.CodecBase 725 726**Since**: 10 727 728 729### OH_MatrixCoefficient 730 731``` 732typedef enum OH_MatrixCoefficient OH_MatrixCoefficient 733``` 734 735**Description** 736 737Defines an enum for the matrix coefficients. 738 739**System capability**: SystemCapability.Multimedia.Media.CodecBase 740 741**Since**: 10 742 743 744### OH_MediaType 745 746``` 747typedef enum OH_MediaType OH_MediaType 748``` 749 750**Description** 751 752Defines an enum for the media types. 753 754**System capability**: SystemCapability.Multimedia.Media.CodecBase 755 756**Since**: 9 757 758 759### OH_ScalingMode 760 761``` 762typedef enum OH_ScalingMode OH_ScalingMode 763``` 764 765**Description** 766 767Defines an enum for the scaling modes. This enum is used only in surface mode. 768 769**System capability**: SystemCapability.Multimedia.Media.CodecBase 770 771**Since**: 10 772 773 774### OH_TemporalGopReferenceMode 775 776``` 777typedef enum OH_TemporalGopReferenceMode OH_TemporalGopReferenceMode 778``` 779 780**Description** 781 782Defines an enum for the reference modes of temporal image groups. 783 784**System capability**: SystemCapability.Multimedia.Media.CodecBase 785 786**Since**: 12 787 788 789### OH_TransferCharacteristic 790 791``` 792typedef enum OH_TransferCharacteristic OH_TransferCharacteristic 793``` 794**Description** 795 796Defines an enum for the transfer characteristics. 797 798**System capability**: SystemCapability.Multimedia.Media.CodecBase 799 800**Since**: 10 801 802 803### OHNativeWindow 804 805``` 806typedef struct NativeWindow OHNativeWindow 807``` 808**Description** 809 810Defines a struct for a native object for the graphics interface. 811 812**Since**: 9 813 814 815## Enum Description 816 817 818### AudioChannelLayout 819 820``` 821enum AudioChannelLayout : uint64_t 822``` 823 824**Description** 825 826Enumerates the types of the audio channel sets. The output format of the decoder is represented as the channel type of the codec. 827 828**System capability**: SystemCapability.Multimedia.Media.CodecBase 829 830**Since**: 10 831 832**Deprecated from**: 11 833 834**Substitute**: [OH_AudioChannelLayout](_core.md#oh_audiochannellayout) 835 836| Value| Description| 837| -------- | -------- | 838| UNKNOWN_CHANNEL_LAYOUT | Unknown.| 839| MONO | Mono layout.| 840| STEREO | Stereo layout| 841| CH_2POINT1 | 2.1 layout.| 842| CH_2_1 | 2_1 layout.| 843| SURROUND | Surround layout.| 844| CH_3POINT1 | 3.1 layout.| 845| CH_4POINT0 | 4.0 layout.| 846| CH_4POINT1 | 4.1 layout.| 847| CH_2_2 | 2_2 layout.| 848| QUAD | Quad layout.| 849| CH_5POINT0 | 5.0 layout.| 850| CH_5POINT1 | 5.1 layout.| 851| CH_5POINT0_BACK | 5.0 rear layout.| 852| CH_5POINT1_BACK | 5.1 rear layout.| 853| CH_6POINT0 | 6.0 layout.| 854| CH_6POINT0_FRONT | 6.0 front layout.| 855| HEXAGONAL | Hexagonal layout.| 856| CH_6POINT1 | 6.1 layout.| 857| CH_6POINT1_BACK | 6.1 rear layout.| 858| CH_6POINT1_FRONT | 6.1 front layout.| 859| CH_7POINT0 | 7.0 layout.| 860| CH_7POINT0_FRONT | 7.0 front layout.| 861| CH_7POINT1 | 7.1 layout.| 862| CH_7POINT1_WIDE | 7.1 wide layout.| 863| CH_7POINT1_WIDE_BACK | 7.1 rear wide layout.| 864| CH_3POINT1POINT2 | 3.1.2 layout.| 865| CH_5POINT1POINT2 | 5.1.2 layout.| 866| CH_5POINT1POINT4 | 5.1.4 layout.| 867| CH_7POINT1POINT2 | 7.1.2 layout.| 868| CH_7POINT1POINT4 | 7.1.4 layout.| 869| CH_9POINT1POINT4 | 9.1.4 layout.| 870| CH_9POINT1POINT6 | 9.1.6 layout.| 871| CH_10POINT2 | 10.2 layout.| 872| CH_22POINT2 | 22.2 layout.| 873| OCTAGONAL | Octagonal layout.| 874| HEXADECAGONAL | Hexadecagonal layout.| 875| STEREO_DOWNMIX | Stereo downmix layout.| 876| HOA_FIRST | High-Order Ambisonics (HOA) first-order layout.| 877| HOA_SECOND | HOA second-order layout.| 878| HOA_THIRD | HOA third-order layout.| 879 880 881### AudioChannelSet 882 883``` 884enum AudioChannelSet : uint64_t 885``` 886 887**Description** 888 889Enumerates the audio channel sets. Each channel number is mapped to a variable of int64_t. 890 891**System capability**: SystemCapability.Multimedia.Media.CodecBase 892 893**Since**: 10 894 895**Deprecated from**: 11. Use [OH_AudioChannelSet](_core.md#oh_audiochannelset) instead. 896 897| Value| Description| 898| -------- | -------- | 899| FRONT_LEFT | Front left channel.| 900| FRONT_RIGHT | Front right channel| 901| FRONT_CENTER | Front center channel.| 902| LOW_FREQUENCY | Low-frequency channel.| 903| BACK_LEFT | Rear left channel.| 904| BACK_RIGHT | Rear right channel| 905| FRONT_LEFT_OF_CENTER | Front left center channel.| 906| FRONT_RIGHT_OF_CENTER | Front right center channel.| 907| BACK_CENTER | Rear center channel.| 908| SIDE_LEFT | Left channel.| 909| SIDE_RIGHT | Right channel.| 910| TOP_CENTER | Top center channel.| 911| TOP_FRONT_LEFT | Top left front channel.| 912| TOP_FRONT_CENTER | Top center front channel.| 913| TOP_FRONT_RIGHT | Top right front channel.| 914| TOP_BACK_LEFT | Top left rear channel.| 915| TOP_BACK_CENTER | Top center rear channel.| 916| TOP_BACK_RIGHT | Top right rear channel.| 917| STEREO_LEFT | Stereo left channel.| 918| STEREO_RIGHT | Stereo right channel.| 919| WIDE_LEFT | Wide left channel.| 920| WIDE_RIGHT | Wide right channel.| 921| SURROUND_DIRECT_LEFT | Left surround channel.| 922| SURROUND_DIRECT_RIGHT | Right surround channel.| 923| LOW_FREQUENCY_2 | Low-frequency channel 2.| 924| TOP_SIDE_LEFT | Top left channel.| 925| TOP_SIDE_RIGHT | Top right channel.| 926| BOTTOM_FRONT_CENTER | Bottom center front channel.| 927| BOTTOM_FRONT_LEFT | Bottom left front channel.| 928| BOTTOM_FRONT_RIGHT | Bottom right front channel.| 929| AMBISONICS_ACN0 | Channel 0 for the zero-order stereo.| 930| AMBISONICS_ACN1 | Channel 1 for the first-order stereo.| 931| AMBISONICS_ACN2 | Channel 2 for the first-order stereo.| 932| AMBISONICS_ACN3 | Channel 3 for the first-order stereo.| 933| AMBISONICS_W | Equivalent to channel 0 for the zero-order stereo.| 934| AMBISONICS_Y | Equivalent to channel 1 for the first-order stereo.| 935| AMBISONICS_Z | Equivalent to channel 2 for the first-order stereo.| 936| AMBISONICS_X | Equivalent to channel 3 for the first-order stereo.| 937| AMBISONICS_ACN4 | Channel 4 for the second-order stereo.| 938| AMBISONICS_ACN5 | Channel 5 for the second-order stereo.| 939| AMBISONICS_ACN6 | Channel 6 for the second-order stereo.| 940| AMBISONICS_ACN7 | Channel 7 for the second-order stereo.| 941| AMBISONICS_ACN8 | Channel 8 for the second-order stereo.| 942| AMBISONICS_ACN9 | Channel 9 for the third-order stereo.| 943| AMBISONICS_ACN10 | Channel 10 for the third-order stereo.| 944| AMBISONICS_ACN11 | Channel 11 for the third-order stereo.| 945| AMBISONICS_ACN12 | Channel 12 for the third-order stereo.| 946| AMBISONICS_ACN13 | Channel 13 for the third-order stereo.| 947| AMBISONICS_ACN14 | Channel 14 for the third-order stereo.| 948| AMBISONICS_ACN15 | Channel 15 for the third-order stereo.| 949 950 951### OH_AACProfile 952 953``` 954enum OH_AACProfile 955``` 956 957**Description** 958 959Enumerates the AAC profiles. 960 961**System capability**: SystemCapability.Multimedia.Media.CodecBase 962 963**Since**: 9 964 965| Value| Description| 966| -------- | -------- | 967| AAC_PROFILE_LC | AAC profile of the low complexity level. | 968 969 970### OH_AVCLevel 971 972``` 973enum OH_AVCLevel 974``` 975 976**Description** 977 978Enumerates the AVC levels. 979 980**System capability**: SystemCapability.Multimedia.Media.CodecBase 981 982**Since**: 12 983 984| Value| Description| 985| -------- | -------- | 986| AVC_LEVEL_1 | Level 1. | 987| AVC_LEVEL_1b | Level 1b. | 988| AVC_LEVEL_11 | Level 1.1. | 989| AVC_LEVEL_12 | Level 1.2. | 990| AVC_LEVEL_13 | Level 1.3. | 991| AVC_LEVEL_2 | Level 2. | 992| AVC_LEVEL_21 | Level 2.1. | 993| AVC_LEVEL_22 | Level 2.2. | 994| AVC_LEVEL_3 | Level 3. | 995| AVC_LEVEL_31 | Level 3.1. | 996| AVC_LEVEL_32 | Level 3.2. | 997| AVC_LEVEL_4 | Level 4. | 998| AVC_LEVEL_41 | Level 4.1. | 999| AVC_LEVEL_42 | Level 4.2. | 1000| AVC_LEVEL_5 | Level 5. | 1001| AVC_LEVEL_51 | Level 5.1. | 1002| AVC_LEVEL_52 | Level 5.2. | 1003| AVC_LEVEL_6 | Level 6. | 1004| AVC_LEVEL_61 | Level 6.1. | 1005| AVC_LEVEL_62 | Level 6.2. | 1006 1007 1008### OH_AVCProfile 1009 1010``` 1011enum OH_AVCProfile 1012``` 1013 1014**Description** 1015 1016Enumerates the AVC profiles. 1017 1018**System capability**: SystemCapability.Multimedia.Media.CodecBase 1019 1020**Since**: 9 1021 1022| Value| Description| 1023| -------- | -------- | 1024| AVC_PROFILE_BASELINE | AVC baseline profile. | 1025| AVC_PROFILE_HIGH | AVC high profile. | 1026| AVC_PROFILE_MAIN | AVC main profile. | 1027 1028 1029### OH_AVOutputFormat 1030 1031``` 1032enum OH_AVOutputFormat 1033``` 1034 1035**Description** 1036 1037Enumerates the output file formats supported by a muxer. 1038 1039**System capability**: SystemCapability.Multimedia.Media.CodecBase 1040 1041**Since**: 10 1042 1043| Value| Description| 1044| -------- | -------- | 1045| AV_OUTPUT_FORMAT_DEFAULT | Default format, which is MP4. | 1046| AV_OUTPUT_FORMAT_MPEG_4 | MP4. | 1047| AV_OUTPUT_FORMAT_M4A | M4A. | 1048| AV_OUTPUT_FORMAT_AMR | AMR.<br>**Since**: 12 | 1049| AV_OUTPUT_FORMAT_MP3 | MP3.<br>**Since**: 12 | 1050| AV_OUTPUT_FORMAT_WAV | WAV.<br>**Since**: 12 | 1051 1052### OH_AVSeekMode 1053 1054``` 1055enum OH_AVSeekMode 1056``` 1057 1058**Description** 1059 1060Enumerates the seek modes. 1061 1062**System capability**: SystemCapability.Multimedia.Media.CodecBase 1063 1064**Since**: 10 1065 1066| Value| Description| 1067| -------- | -------- | 1068| SEEK_MODE_NEXT_SYNC | Seeks to the next I-frame at the specified position. If there is no I-frame after the specified position, the seek operation may fail. | 1069| SEEK_MODE_PREVIOUS_SYNC | Seeks to the previous I-frame at the specified position. | 1070| SEEK_MODE_CLOSEST_SYNC | Seeks to the latest I-frame at the specified position. | 1071 1072 1073### OH_BitsPerSample 1074 1075``` 1076enum OH_BitsPerSample 1077``` 1078 1079**Description** 1080 1081Enumerates the number of audio bits for each coded sample. 1082 1083**System capability**: SystemCapability.Multimedia.Media.CodecBase 1084 1085**Since**: 10 1086 1087| Value| Description| 1088| -------- | -------- | 1089| SAMPLE_U8 | 8-bit unsigned integer sampling. | 1090| SAMPLE_S16LE | 16-bit signed integer sampling. | 1091| SAMPLE_S24LE | 24-bit signed integer sampling. | 1092| SAMPLE_S32LE | 32-bit signed integer sampling. | 1093| SAMPLE_F32LE | 32-bit floating-point sampling. | 1094| SAMPLE_U8P | 8-bit unsigned integer plane sampling. | 1095| SAMPLE_S16P | 16-bit signed integer plane sampling. | 1096| SAMPLE_S24P | 24-bit signed integer plane sampling. | 1097| SAMPLE_S32P | 32-bit signed integer plane sampling. | 1098| SAMPLE_F32P | 32-bit floating-point plane sampling. | 1099| INVALID_WIDTH | Invalid sampling format. | 1100 1101 1102### OH_ColorPrimary 1103 1104``` 1105enum OH_ColorPrimary 1106``` 1107 1108**Description** 1109 1110Enumerates the primary colors. This enum is used for both encoding and decoding. 1111 1112**System capability**: SystemCapability.Multimedia.Media.CodecBase 1113 1114**Since**: 10 1115 1116| Value| Description| 1117| -------- | -------- | 1118| COLOR_PRIMARY_BT709 | BT.709 color gamut. | 1119| COLOR_PRIMARY_UNSPECIFIED | Unspecified color gamut. | 1120| COLOR_PRIMARY_BT470_M | BT.470 System M color gamut. | 1121| COLOR_PRIMARY_BT601_625 | BT.601 625 color gamut. | 1122| COLOR_PRIMARY_BT601_525 | BT.601 525 color gamut. | 1123| COLOR_PRIMARY_SMPTE_ST240 | SMPTE ST 240 color gamut. | 1124| COLOR_PRIMARY_GENERIC_FILM | Generic film color gamut. | 1125| COLOR_PRIMARY_BT2020 | BT.2020 color gamut. | 1126| COLOR_PRIMARY_SMPTE_ST428 | SMPTE ST 428 color gamut. | 1127| COLOR_PRIMARY_P3DCI | DCI-P3 color gamut. | 1128| COLOR_PRIMARY_P3D65 | P3-D65 color gamut. | 1129 1130### OH_HEVCLevel 1131 1132``` 1133enum OH_HEVCLevel 1134``` 1135 1136**Description** 1137 1138Enumerates the HEVC levels. 1139 1140**System capability**: SystemCapability.Multimedia.Media.CodecBase 1141 1142**Since**: 12 1143 1144| Value| Description| 1145| -------- | -------- | 1146| HEVC_LEVEL_1 | Level 1. | 1147| HEVC_LEVEL_2 | Level 2. | 1148| HEVC_LEVEL_21 | Level 2.1. | 1149| HEVC_LEVEL_3 | Level 3. | 1150| HEVC_LEVEL_31 | Level 3.1. | 1151| HEVC_LEVEL_4 | Level 4. | 1152| HEVC_LEVEL_41 | Level 4.1. | 1153| HEVC_LEVEL_5 | Level 5. | 1154| HEVC_LEVEL_51 | Level 5.1. | 1155| HEVC_LEVEL_52 | Level 5.2. | 1156| HEVC_LEVEL_6 | Level 6. | 1157| HEVC_LEVEL_61 | Level 6.1. | 1158| HEVC_LEVEL_62 | Level 6.2. | 1159 1160 1161### OH_HEVCProfile 1162 1163``` 1164enum OH_HEVCProfile 1165``` 1166 1167**Description** 1168 1169Enumerates the HEVC profiles. 1170 1171**System capability**: SystemCapability.Multimedia.Media.CodecBase 1172 1173**Since**: 10 1174 1175| Value| Description| 1176| -------- | -------- | 1177| HEVC_PROFILE_MAIN | HEVC profile of the main level. | 1178| HEVC_PROFILE_MAIN_10 | HEVC profile of the 10-bit main level. | 1179| HEVC_PROFILE_MAIN_STILL | HEVC profile of the main still picture level. | 1180| HEVC_PROFILE_MAIN_10_HDR10 | HEVC profile of the main 10 HDR10 level. | 1181| HEVC_PROFILE_MAIN_10_HDR10_PLUS | HEVC profile of the main 10 HDR10+ level. | 1182 1183 1184### OH_MatrixCoefficient 1185 1186``` 1187enum OH_MatrixCoefficient 1188``` 1189 1190**Description** 1191 1192Enumerates the matrix coefficients. This enum is used for both encoding and decoding. 1193 1194**System capability**: SystemCapability.Multimedia.Media.CodecBase 1195 1196**Since**: 10 1197 1198| Value| Description| 1199| -------- | -------- | 1200| MATRIX_COEFFICIENT_IDENTITY | Identity matrix. | 1201| MATRIX_COEFFICIENT_BT709 | BT.709 conversion matrix. | 1202| MATRIX_COEFFICIENT_UNSPECIFIED | Unspecified conversion matrix. | 1203| MATRIX_COEFFICIENT_FCC | FCC conversion matrix. | 1204| MATRIX_COEFFICIENT_BT601_625 | BT.601 625 conversion matrix. | 1205| MATRIX_COEFFICIENT_BT601_525 | BT.601 525 conversion matrix. | 1206| MATRIX_COEFFICIENT_SMPTE_ST240 | SMPTE ST 240 conversion matrix. | 1207| MATRIX_COEFFICIENT_YCGCO | YCgCo conversion matrix. | 1208| MATRIX_COEFFICIENT_BT2020_NCL | BT.2020 NCL conversion matrix. | 1209| MATRIX_COEFFICIENT_BT2020_CL | BT.2020 CL conversion matrix. | 1210| MATRIX_COEFFICIENT_SMPTE_ST2085 | SMPTE ST 2085 conversion matrix. | 1211| MATRIX_COEFFICIENT_CHROMATICITY_NCL | Chromaticity NCL conversion matrix. | 1212| MATRIX_COEFFICIENT_CHROMATICITY_CL | Chromaticity CL conversion matrix. | 1213| MATRIX_COEFFICIENT_ICTCP | ICTCP conversion matrix. | 1214 1215 1216### OH_MediaType 1217 1218``` 1219enum OH_MediaType 1220``` 1221 1222**Description** 1223 1224Enumerates the media types. 1225 1226**System capability**: SystemCapability.Multimedia.Media.CodecBase 1227 1228**Since**: 9 1229 1230| Value| Description| 1231| -------- | -------- | 1232| MEDIA_TYPE_AUD | Audio track. | 1233| MEDIA_TYPE_VID | Video track. | 1234| MEDIA_TYPE_SUBTITILE | Subtitle track.<br>**Since**: 12 | 1235 1236### OH_ScalingMode 1237 1238``` 1239enum OH_ScalingMode 1240``` 1241 1242**Description** 1243 1244Enumerates the scaling modes. This enum is used only in surface mode. 1245 1246**System capability**: SystemCapability.Multimedia.Media.CodecBase 1247 1248**Since**: 10 1249 1250| Value| Description| 1251| -------- | -------- | 1252| SCALING_MODE_SCALE_TO_WINDOW | Scales the image based on the window size. | 1253| SCALING_MODE_SCALE_CROP | Crops the image based on the window size. | 1254 1255 1256### OH_TemporalGopReferenceMode 1257 1258``` 1259enum OH_TemporalGopReferenceMode 1260``` 1261 1262**Description** 1263 1264Enumerates the reference modes of temporal image groups. 1265 1266**System capability**: SystemCapability.Multimedia.Media.CodecBase 1267 1268**Since**: 12 1269 1270| Value| Description| 1271| -------- | -------- | 1272| ADJACENT_REFERENCE | Refers to the nearest short-term reference frame. | 1273| JUMP_REFERENCE | Refers to the latest LTR frame. | 1274| UNIFORMLY_SCALED_REFERENCE | Drops video frames at the highest level, and evenly distributes the remaining frames. The number of temporal image groups must be a power of 2. | 1275 1276 1277### OH_TransferCharacteristic 1278 1279``` 1280enum OH_TransferCharacteristic 1281``` 1282 1283**Description** 1284 1285Enumerates the transfer characteristics. This enum can be used for both encoding and decoding. 1286 1287**System capability**: SystemCapability.Multimedia.Media.CodecBase 1288 1289**Since**: 10 1290 1291| Value| Description| 1292| -------- | -------- | 1293| TRANSFER_CHARACTERISTIC_BT709 | BT.709 transfer function. | 1294| TRANSFER_CHARACTERISTIC_UNSPECIFIED | Unspecified transfer function. | 1295| TRANSFER_CHARACTERISTIC_GAMMA_2_2 | Gamma 2-2 transfer function. | 1296| TRANSFER_CHARACTERISTIC_GAMMA_2_8 | Gamma 2-8 transfer function. | 1297| TRANSFER_CHARACTERISTIC_BT601 | BT.601 transfer function. | 1298| TRANSFER_CHARACTERISTIC_SMPTE_ST240 | SMPTE ST 240 transfer function. | 1299| TRANSFER_CHARACTERISTIC_LINEAR | Linear transfer function. | 1300| TRANSFER_CHARACTERISTIC_LOG | Log transfer function. | 1301| TRANSFER_CHARACTERISTIC_LOG_SQRT | Log SQRT transfer function. | 1302| TRANSFER_CHARACTERISTIC_IEC_61966_2_4 | IEC61966-2.4 transfer function. | 1303| TRANSFER_CHARACTERISTIC_BT1361 | BT.1361 transfer function. | 1304| TRANSFER_CHARACTERISTIC_IEC_61966_2_1 | IEC61966 2.1 transfer function. | 1305| TRANSFER_CHARACTERISTIC_BT2020_10BIT | BT.2020 10-bit transfer function. | 1306| TRANSFER_CHARACTERISTIC_BT2020_12BIT | BT.2020 12-bit transfer function. | 1307| TRANSFER_CHARACTERISTIC_PQ | PQ transfer function. | 1308| TRANSFER_CHARACTERISTIC_SMPTE_ST428 | SMPTE ST.428 transfer function. | 1309| TRANSFER_CHARACTERISTIC_HLG | HLG transfer function. | 1310 1311 1312## Variable Description 1313 1314 1315### OH_AVCODEC_MIMETYPE_SUBTITLE_SRT 1316 1317``` 1318const char* OH_AVCODEC_MIMETYPE_SUBTITLE_SRT 1319``` 1320 1321**Description** 1322 1323Pointer to the key that describes the MIME type of the SRT subtitle demuxer. 1324 1325**System capability**: SystemCapability.Multimedia.Media.CodecBase 1326 1327**Since**: 12 1328 1329 1330### OH_AVCODEC_MIMETYPE_SUBTITLE_WEBVTT 1331 1332``` 1333const char* OH_AVCODEC_MIMETYPE_SUBTITLE_WEBVTT 1334``` 1335 1336**Description** 1337 1338Pointer to the key that describes the MIME type of the WEBVTT subtitle demuxer. 1339 1340**System capability**: SystemCapability.Multimedia.Media.CodecBase 1341 1342**Since**: 12 1343 1344 1345### OH_AVCODEC_MIMETYPE_AUDIO_APE 1346 1347``` 1348const char* OH_AVCODEC_MIMETYPE_AUDIO_APE 1349``` 1350 1351**Description** 1352 1353Pointer to the key that describes the MIME type of the APE audio decoder. 1354 1355**System capability**: SystemCapability.Multimedia.Media.CodecBase 1356 1357**Since**: 12 1358 1359 1360### OH_AVCODEC_MIMETYPE_AUDIO_AAC 1361 1362``` 1363const char* OH_AVCODEC_MIMETYPE_AUDIO_AAC 1364``` 1365 1366**Description** 1367 1368Pointer to the key that describes the MIME type of the AAC audio codec. 1369 1370**System capability**: SystemCapability.Multimedia.Media.CodecBase 1371 1372**Since**: 9 1373 1374 1375### OH_AVCODEC_MIMETYPE_AUDIO_AMR_NB 1376 1377``` 1378const char* OH_AVCODEC_MIMETYPE_AUDIO_AMR_NB 1379``` 1380 1381**Description** 1382 1383Pointer to the key that describes the MIME type of the AMR-NB audio decoder. 1384 1385**System capability**: SystemCapability.Multimedia.Media.CodecBase 1386 1387**Since**: 11 1388 1389 1390### OH_AVCODEC_MIMETYPE_AUDIO_AMR_WB 1391 1392``` 1393const char* OH_AVCODEC_MIMETYPE_AUDIO_AMR_WB 1394``` 1395 1396**Description** 1397 1398Pointer to the key that describes the MIME type of the AMR-WB audio decoder. 1399 1400**System capability**: SystemCapability.Multimedia.Media.CodecBase 1401 1402**Since**: 11 1403 1404 1405### OH_AVCODEC_MIMETYPE_AUDIO_FLAC 1406 1407``` 1408const char* OH_AVCODEC_MIMETYPE_AUDIO_FLAC 1409``` 1410 1411**Description** 1412 1413Pointer to the key that describes the MIME type for FLAC audio codec. 1414 1415**System capability**: SystemCapability.Multimedia.Media.CodecBase 1416 1417**Since**: 10 1418 1419 1420### OH_AVCODEC_MIMETYPE_AUDIO_G711MU 1421 1422``` 1423const char* OH_AVCODEC_MIMETYPE_AUDIO_G711MU 1424``` 1425 1426**Description** 1427 1428Pointer to the key that describes the MIME type of the G.711 mu-law audio codec. 1429 1430**System capability**: SystemCapability.Multimedia.Media.CodecBase 1431 1432**Since**: 11 1433 1434 1435### OH_AVCODEC_MIMETYPE_AUDIO_MPEG 1436 1437``` 1438const char* OH_AVCODEC_MIMETYPE_AUDIO_MPEG 1439``` 1440 1441**Description** 1442 1443Pointer to the key that describes the MIME type of the MP3 audio decoder. 1444 1445**System capability**: SystemCapability.Multimedia.Media.CodecBase 1446 1447**Since**: 10 1448 1449 1450### OH_AVCODEC_MIMETYPE_AUDIO_OPUS 1451 1452``` 1453const char* OH_AVCODEC_MIMETYPE_AUDIO_OPUS 1454``` 1455 1456**Description** 1457 1458Pointer to the key that describes the MIME type of the Opus audio codec. <!--Del-->(This specification is not available yet.)<!--DelEnd--> 1459 1460**System capability**: SystemCapability.Multimedia.Media.CodecBase 1461 1462**Since**: 11 1463 1464 1465### OH_AVCODEC_MIMETYPE_AUDIO_VIVID 1466 1467``` 1468const char* OH_AVCODEC_MIMETYPE_AUDIO_VIVID 1469``` 1470 1471**Description** 1472 1473Pointer to the key that describes the MIME type of the Audio Vivid audio decoder. <!--Del-->(This specification is not available yet.)<!--DelEnd--> 1474 1475**System capability**: SystemCapability.Multimedia.Media.CodecBase 1476 1477**Since**: 11 1478 1479 1480### OH_AVCODEC_MIMETYPE_AUDIO_VORBIS 1481 1482``` 1483const char* OH_AVCODEC_MIMETYPE_AUDIO_VORBIS 1484``` 1485 1486**Description** 1487 1488Pointer to the key that describes the MIME type of the Vorbis audio decoder. 1489 1490**System capability**: SystemCapability.Multimedia.Media.CodecBase 1491 1492**Since**: 10 1493 1494 1495### OH_AVCODEC_MIMETYPE_IMAGE_BMP 1496 1497``` 1498const char* OH_AVCODEC_MIMETYPE_IMAGE_BMP 1499``` 1500 1501**Description** 1502 1503Pointer to the key that describes the MIME type of the BMP image encoder, which is used only for muxing BMP covers. 1504 1505**System capability**: SystemCapability.Multimedia.Media.CodecBase 1506 1507**Since**: 10 1508 1509 1510### OH_AVCODEC_MIMETYPE_IMAGE_JPG 1511 1512``` 1513const char* OH_AVCODEC_MIMETYPE_IMAGE_JPG 1514``` 1515 1516**Description** 1517 1518Pointer to the key that describes the MIME type of the JPG image encoder, which is used only for muxing JPG covers. 1519 1520**System capability**: SystemCapability.Multimedia.Media.CodecBase 1521 1522**Since**: 10 1523 1524 1525### OH_AVCODEC_MIMETYPE_IMAGE_PNG 1526 1527``` 1528const char* OH_AVCODEC_MIMETYPE_IMAGE_PNG 1529``` 1530 1531**Description** 1532 1533Pointer to the key that describes the MIME type of the PNG image encoder, which is used only for muxing PNG covers. 1534 1535**System capability**: SystemCapability.Multimedia.Media.CodecBase 1536 1537**Since**: 10 1538 1539 1540### OH_AVCODEC_MIMETYPE_VIDEO_AVC 1541 1542``` 1543const char* OH_AVCODEC_MIMETYPE_VIDEO_AVC 1544``` 1545 1546**Description** 1547 1548Pointer to the key that describes the MIME type of the AVC (H.264) video codec. 1549 1550**System capability**: SystemCapability.Multimedia.Media.CodecBase 1551 1552**Since**: 9 1553 1554 1555### OH_AVCODEC_MIMETYPE_VIDEO_HEVC 1556 1557``` 1558const char* OH_AVCODEC_MIMETYPE_VIDEO_HEVC 1559``` 1560 1561**Description** 1562 1563Pointer to the key that describes the MIME type of the HEVC (H.265) video codec. 1564 1565**System capability**: SystemCapability.Multimedia.Media.CodecBase 1566 1567**Since**: 10 1568 1569 1570### OH_AVCODEC_MIMETYPE_VIDEO_MPEG4 1571 1572``` 1573const char* OH_AVCODEC_MIMETYPE_VIDEO_MPEG4 1574``` 1575 1576**Description** 1577 1578Pointer to the key that describes the MIME type of the MPEG4 video encoder, which is used only for muxing MPEG4 video streams. 1579 1580**System capability**: SystemCapability.Multimedia.Media.CodecBase 1581 1582**Since**: 10 1583 1584**Deprecated from**: 11 1585 1586 1587### OH_ED_KEY_EOS 1588 1589``` 1590const char* OH_ED_KEY_EOS 1591``` 1592 1593**Description** 1594 1595Pointer to the key that describes the end of stream for the surface buffer. The value type is int32_t. <!--Del-->(This key is not supported yet.)<!--DelEnd--> 1596 1597**System capability**: SystemCapability.Multimedia.Media.CodecBase 1598 1599**Since**: 9 1600 1601 1602### OH_ED_KEY_TIME_STAMP 1603 1604``` 1605const char* OH_ED_KEY_TIME_STAMP 1606``` 1607 1608**Description** 1609 1610Pointer to the key that describes the surface buffer timestamp. The value is of the int64_t type. <!--Del-->(This key is not supported yet.)<!--DelEnd--> 1611 1612**System capability**: SystemCapability.Multimedia.Media.CodecBase 1613 1614**Since**: 9 1615 1616 1617### OH_FEATURE_PROPERTY_KEY_VIDEO_ENCODER_MAX_LTR_FRAME_COUNT 1618 1619``` 1620const char* OH_FEATURE_PROPERTY_KEY_VIDEO_ENCODER_MAX_LTR_FRAME_COUNT 1621``` 1622 1623**Description** 1624 1625Pointer to the key that describes the maximum number of LTR frames obtained during video encoding. The value type is int32_t. 1626 1627You can use the API [OH_AVCapability_GetFeatureProperties](_a_v_capability.md#oh_avcapability_getfeatureproperties) and the enum [VIDEO_ENCODER_LONG_TERM_REFERENCE](_a_v_capability.md#oh_avcapabilityfeature) to query the maximum number. 1628 1629**System capability**: SystemCapability.Multimedia.Media.CodecBase 1630 1631**Since**: 12 1632 1633 1634### OH_MD_KEY_AAC_IS_ADTS 1635 1636``` 1637const char* OH_MD_KEY_AAC_IS_ADTS 1638``` 1639 1640**Description** 1641 1642Pointer to the key that describes the AAC format, which can be ADTS or LATM. The value type is int32_t. The value **0** means the LATM format, and **1** means the ADTS format. This key is supported by AAC decoders. 1643 1644**System capability**: SystemCapability.Multimedia.Media.CodecBase 1645 1646**Since**: 10 1647 1648 1649### OH_MD_KEY_ALBUM 1650 1651``` 1652const char* OH_MD_KEY_ALBUM 1653``` 1654 1655**Description** 1656 1657Pointer to the key that describes the album in a media file. The value type is string. 1658 1659**System capability**: SystemCapability.Multimedia.Media.CodecBase 1660 1661**Since**: 10 1662 1663 1664### OH_MD_KEY_ALBUM_ARTIST 1665 1666``` 1667const char* OH_MD_KEY_ALBUM_ARTIST 1668``` 1669 1670**Description** 1671 1672Pointer to the key that describes the album artist in a media file. The value type is string. 1673 1674**System capability**: SystemCapability.Multimedia.Media.CodecBase 1675 1676**Since**: 10 1677 1678 1679### OH_MD_KEY_ARTIST 1680 1681``` 1682const char* OH_MD_KEY_ARTIST 1683``` 1684 1685**Description** 1686 1687Pointer to the key that describes lyrics in a media file. The value type is string. 1688 1689**System capability**: SystemCapability.Multimedia.Media.CodecBase 1690 1691**Since**: 10 1692 1693 1694### OH_MD_KEY_AUD_CHANNEL_COUNT 1695 1696``` 1697const char* OH_MD_KEY_AUD_CHANNEL_COUNT 1698``` 1699 1700**Description** 1701 1702Pointer to the key that describes the number of audio channels. The value type is int32_t. 1703 1704**System capability**: SystemCapability.Multimedia.Media.CodecBase 1705 1706**Since**: 9 1707 1708 1709### OH_MD_KEY_AUD_SAMPLE_RATE 1710 1711``` 1712const char* OH_MD_KEY_AUD_SAMPLE_RATE 1713``` 1714 1715**Description** 1716 1717Pointer to the key that describes the audio sampling rate. The value type is int32_t. 1718 1719**System capability**: SystemCapability.Multimedia.Media.CodecBase 1720 1721**Since**: 9 1722 1723 1724### OH_MD_KEY_AUDIO_COMPRESSION_LEVEL 1725 1726``` 1727const char* OH_MD_KEY_AUDIO_COMPRESSION_LEVEL 1728``` 1729 1730**Description** 1731 1732Pointer to the key that describes the audio codec compression level. The value type is int32_t type. This key is used only for audio encoding. 1733 1734**System capability**: SystemCapability.Multimedia.Media.CodecBase 1735 1736**Since**: 11 1737 1738 1739### OH_MD_KEY_AUDIO_OBJECT_NUMBER 1740 1741``` 1742const char* OH_MD_KEY_AUDIO_OBJECT_NUMBER 1743``` 1744 1745**Description** 1746 1747Pointer to the key that describes the number of audio objects. The value type is int32_t. This key is used only for Audio Vivid decoding. 1748 1749**System capability**: SystemCapability.Multimedia.Media.CodecBase 1750 1751**Since**: 11 1752 1753 1754### OH_MD_KEY_AUDIO_SAMPLE_FORMAT 1755 1756``` 1757const char* OH_MD_KEY_AUDIO_SAMPLE_FORMAT 1758``` 1759 1760**Description** 1761 1762Pointer to the key that describes the original audio format. The value type is int32_t. For details, see [AudioSampleFormat](../apis-audio-kit/js-apis-audio.md#audiosampleformat8). 1763 1764**System capability**: SystemCapability.Multimedia.Media.CodecBase 1765 1766**Since**: 9 1767 1768 1769### OH_MD_KEY_AUDIO_VIVID_METADATA 1770 1771``` 1772const char* OH_MD_KEY_AUDIO_VIVID_METADATA 1773``` 1774 1775**Description** 1776 1777Pointer to the key that describes the Audio Vivid metadata. The value type is uint8_t\*. This key is used only for Audio Vivid decoding. 1778 1779**System capability**: SystemCapability.Multimedia.Media.CodecBase 1780 1781**Since**: 11 1782 1783 1784### OH_MD_KEY_BITRATE 1785 1786``` 1787const char* OH_MD_KEY_BITRATE 1788``` 1789 1790**Description** 1791 1792Pointer to the key that describes the bit rate. The value type is int64_t. 1793 1794**System capability**: SystemCapability.Multimedia.Media.CodecBase 1795 1796**Since**: 9 1797 1798 1799### OH_MD_KEY_BITS_PER_CODED_SAMPLE 1800 1801``` 1802const char* OH_MD_KEY_BITS_PER_CODED_SAMPLE 1803``` 1804 1805**Description** 1806 1807Pointer to the key that describes the number of bits for each coded sample. The value type is int32_t. This key applies to FLAC encoders. For details, see [OH_BitsPerSample](#oh_bitspersample). 1808 1809**System capability**: SystemCapability.Multimedia.Media.CodecBase 1810 1811**Since**: 10 1812 1813 1814### OH_MD_KEY_CHANNEL_LAYOUT 1815 1816``` 1817const char* OH_MD_KEY_CHANNEL_LAYOUT 1818``` 1819 1820**Description** 1821 1822Pointer to the key that describes the required encoding channel layout. The value type is int64_t. This key applies only to encoders. 1823 1824**System capability**: SystemCapability.Multimedia.Media.CodecBase 1825 1826**Since**: 10 1827 1828 1829### OH_MD_KEY_CODEC_CONFIG 1830 1831``` 1832const char* OH_MD_KEY_CODEC_CONFIG 1833``` 1834 1835**Description** 1836 1837Pointer to the key that describes the codec-specific data. In the case of video, data carried in **SPS/PPS** is transferred. In the case of audio, data carried in **extraData** is transferred. The value type is uint8_t\*. <!--Del-->(This key is not supported yet for the video codec.)<!--DelEnd--> 1838 1839**System capability**: SystemCapability.Multimedia.Media.CodecBase 1840 1841**Since**: 10 1842 1843 1844### OH_MD_KEY_CODEC_MIME 1845 1846``` 1847const char* OH_MD_KEY_CODEC_MIME 1848``` 1849 1850**Description** 1851 1852Pointer to the key that describes the MIME type of the codec. The value type is string. 1853 1854**System capability**: SystemCapability.Multimedia.Media.CodecBase 1855 1856**Since**: 9 1857 1858 1859### OH_MD_KEY_COLOR_PRIMARIES 1860 1861``` 1862const char* OH_MD_KEY_COLOR_PRIMARIES 1863``` 1864 1865**Description** 1866 1867Pointer to the key that describes the video primary color. The value type is int32_t. For details, see [OH_ColorPrimary](#oh_colorprimary). The video primary color complies with Table 2 in the H.273 standard. 1868 1869**System capability**: SystemCapability.Multimedia.Media.CodecBase 1870 1871**Since**: 10 1872 1873 1874### OH_MD_KEY_COMMENT 1875 1876``` 1877const char* OH_MD_KEY_COMMENT 1878``` 1879 1880**Description** 1881 1882Pointer to the key that describes the comment in a media file. The value type is string. 1883 1884**System capability**: SystemCapability.Multimedia.Media.CodecBase 1885 1886**Since**: 10 1887 1888 1889### OH_MD_KEY_COMPLIANCE_LEVEL 1890 1891``` 1892const char* OH_MD_KEY_COMPLIANCE_LEVEL 1893``` 1894 1895**Description** 1896 1897Pointer to the key that describes the FLAC compliance level. The value type is int32_t. This key is used only for audio encoding. 1898 1899**System capability**: SystemCapability.Multimedia.Media.CodecBase 1900 1901**Since**: 10 1902 1903 1904### OH_MD_KEY_COPYRIGHT 1905 1906``` 1907const char* OH_MD_KEY_COPYRIGHT 1908``` 1909 1910**Description** 1911 1912Pointer to the key that describes the copyright in a media file. The value type is string. 1913 1914**System capability**: SystemCapability.Multimedia.Media.CodecBase 1915 1916**Since**: 10 1917 1918 1919### OH_MD_KEY_DATE 1920 1921``` 1922const char* OH_MD_KEY_DATE 1923``` 1924 1925**Description** 1926 1927Pointer to the key that describes the date in a media file, for example, 2024. The value type is string. 1928 1929**System capability**: SystemCapability.Multimedia.Media.CodecBase 1930 1931**Since**: 10 1932 1933 1934### OH_MD_KEY_DESCRIPTION 1935 1936``` 1937const char* OH_MD_KEY_DESCRIPTION 1938``` 1939 1940**Description** 1941 1942Pointer to the key that describes the description in a media file. The value type is string. 1943 1944**System capability**: SystemCapability.Multimedia.Media.CodecBase 1945 1946**Since**: 10 1947 1948 1949### OH_MD_KEY_DURATION 1950 1951``` 1952const char* OH_MD_KEY_DURATION 1953``` 1954 1955**Description** 1956 1957Pointer to the key that describes the duration in a media file, in microseconds. The value type is int64_t. 1958 1959**System capability**: SystemCapability.Multimedia.Media.CodecBase 1960 1961**Since**: 9 1962 1963 1964### OH_MD_KEY_FRAME_RATE 1965 1966``` 1967const char* OH_MD_KEY_FRAME_RATE 1968``` 1969 1970**Description** 1971 1972Pointer to the key that describes the video frame rate. The value type is double. The value must be greater than **0**. 1973 1974**System capability**: SystemCapability.Multimedia.Media.CodecBase 1975 1976**Since**: 9 1977 1978 1979### OH_MD_KEY_GENRE 1980 1981``` 1982const char* OH_MD_KEY_GENRE 1983``` 1984 1985**Description** 1986 1987Pointer to the key that describes the genre in a media file. The value type is string. 1988 1989**System capability**: SystemCapability.Multimedia.Media.CodecBase 1990 1991**Since**: 10 1992 1993 1994### OH_MD_KEY_HEIGHT 1995 1996``` 1997const char* OH_MD_KEY_HEIGHT 1998``` 1999 2000**Description** 2001 2002Pointer to the key that describes the video height. The value type is int32_t. 2003 2004**System capability**: SystemCapability.Multimedia.Media.CodecBase 2005 2006**Since**: 9 2007 2008 2009### OH_MD_KEY_I_FRAME_INTERVAL 2010 2011``` 2012const char* OH_MD_KEY_I_FRAME_INTERVAL 2013``` 2014 2015**Description** 2016 2017Pointer to the key that describes the key frame interval, in milliseconds. The value type is int32_t. This key is optional and is used only for video encoding. 2018 2019A negative value indicates that only the first frame is a key frame, and a zero value indicates that all frames are key frames. 2020 2021**System capability**: SystemCapability.Multimedia.Media.CodecBase 2022 2023**Since**: 9 2024 2025 2026### OH_MD_KEY_IDENTIFICATION_HEADER 2027 2028``` 2029const char* OH_MD_KEY_IDENTIFICATION_HEADER 2030``` 2031 2032**Description** 2033 2034Pointer to the key that describes the Vorbis identification header. The value type is uint8_t. This key applies only to Vorbis decoders. 2035 2036**System capability**: SystemCapability.Multimedia.Media.CodecBase 2037 2038**Since**: 10 2039 2040 2041### OH_MD_KEY_LANGUAGE 2042 2043``` 2044const char* OH_MD_KEY_LANGUAGE 2045``` 2046 2047**Description** 2048 2049Pointer to the key that describes the language in a media file. The value type is string. 2050 2051**System capability**: SystemCapability.Multimedia.Media.CodecBase 2052 2053**Since**: 10 2054 2055 2056### OH_MD_KEY_LYRICS 2057 2058``` 2059const char* OH_MD_KEY_LYRICS 2060``` 2061 2062**Description** 2063 2064Pointer to the key that describes the lyrics in a media file. The value type is string. 2065 2066**System capability**: SystemCapability.Multimedia.Media.CodecBase 2067 2068**Since**: 10 2069 2070 2071### OH_MD_KEY_MATRIX_COEFFICIENTS 2072 2073``` 2074const char* OH_MD_KEY_MATRIX_COEFFICIENTS 2075``` 2076 2077**Description** 2078 2079Pointer to the key that describes the video matrix coefficient. The value type is int32_t. For details, see [OH_MatrixCoefficient](#oh_matrixcoefficient). The video matrix coefficient complies with Table 4 in the H.273 standard. 2080 2081**System capability**: SystemCapability.Multimedia.Media.CodecBase 2082 2083**Since**: 10 2084 2085 2086### OH_MD_KEY_MAX_INPUT_SIZE 2087 2088``` 2089const char* OH_MD_KEY_MAX_INPUT_SIZE 2090``` 2091 2092**Description** 2093 2094Pointer to the key that describes the maximum size of an input stream to decode. The value type is int32_t. 2095 2096**System capability**: SystemCapability.Multimedia.Media.CodecBase 2097 2098**Since**: 9 2099 2100 2101### OH_MD_KEY_PIXEL_FORMAT 2102 2103``` 2104const char* OH_MD_KEY_PIXEL_FORMAT 2105``` 2106 2107**Description** 2108 2109Pointer to the key that describes the video pixel format. The value type is int32_t. For details, see [OH_AVPixelFormat](_core.md#oh_avpixelformat). 2110 2111**System capability**: SystemCapability.Multimedia.Media.CodecBase 2112 2113**Since**: 9 2114 2115 2116### OH_MD_KEY_PROFILE 2117 2118``` 2119const char* OH_MD_KEY_PROFILE 2120``` 2121 2122**Description** 2123 2124Pointer to the key that describes the encoding grading. The value type is int32_t. For details, see [OH_AVCProfile](#oh_avcprofile), [OH_HEVCProfile](#oh_hevcprofile), and [OH_AACProfile](#oh_aacprofile). 2125 2126**System capability**: SystemCapability.Multimedia.Media.CodecBase 2127 2128**Since**: 9 2129 2130 2131### OH_MD_KEY_QUALITY 2132 2133``` 2134const char* OH_MD_KEY_QUALITY 2135``` 2136 2137**Description** 2138 2139Pointer to the key that describes the required encoding quality. The value type is int32_t. In H.264 and H.265 encoding scenarios, the value range can be obtained by calling **OH_AVCapability_GetEncoderQualityRange()**. This key applies only to the encoder in constant quality mode. 2140 2141**System capability**: SystemCapability.Multimedia.Media.CodecBase 2142 2143**Since**: 10 2144 2145 2146### OH_MD_KEY_RANGE_FLAG 2147 2148``` 2149const char* OH_MD_KEY_RANGE_FLAG 2150``` 2151 2152**Description** 2153 2154Pointer to the key that describes the video YUV value range flag. The value type is int32_t. The value **1** means a full range, and **0** means a limited range. 2155 2156**System capability**: SystemCapability.Multimedia.Media.CodecBase 2157 2158**Since**: 10 2159 2160 2161### OH_MD_KEY_REQUEST_I_FRAME 2162 2163``` 2164const char* OH_MD_KEY_REQUEST_I_FRAME 2165``` 2166 2167**Description** 2168 2169Pointer to the key that describes the request for immediate encoding of I-frames. The value type is int32_t. This key is used in **OH_VideoEncoder_SetParameter()** or takes effect immediately with the frame. 2170 2171**System capability**: SystemCapability.Multimedia.Media.CodecBase 2172 2173**Since**: 10 2174 2175 2176### OH_MD_KEY_ROTATION 2177 2178``` 2179const char* OH_MD_KEY_ROTATION 2180``` 2181 2182**Description** 2183 2184Pointer to the key that describes the rotation angle of the surface. The value type is int32_t, and the value range is {0, 90, 180, 270}. The default value is 0. This key is used only in video decoding surface mode. 2185 2186**System capability**: SystemCapability.Multimedia.Media.CodecBase 2187 2188**Since**: 9 2189 2190 2191### OH_MD_KEY_SBR 2192 2193``` 2194const char* OH_MD_KEY_SBR 2195``` 2196 2197**Description** 2198 2199Pointer to the key that describes the AAC SBR format. The value type is int32_t. This key applies to AAC encoders. 2200 2201**System capability**: SystemCapability.Multimedia.Media.CodecBase 2202 2203**Since**: 10 2204 2205 2206### OH_MD_KEY_SCALING_MODE 2207 2208``` 2209const char* OH_MD_KEY_SCALING_MODE 2210``` 2211 2212**Description** 2213 2214Pointer to the key that describes the video scaling mode. The value type is int32_t. For details, see [OH_ScalingMode](#oh_scalingmode). You are advised to set the scaling mode by calling [OH_NativeWindow_NativeWindowSetScalingModeV2](../apis-arkgraphics2d/_native_window.md). This key is optional and is used only for video decoding in surface mode. 2215 2216**System capability**: SystemCapability.Multimedia.Media.CodecBase 2217 2218**Since**: 10 2219 2220 2221### OH_MD_KEY_SETUP_HEADER 2222 2223``` 2224const char* OH_MD_KEY_SETUP_HEADER 2225``` 2226 2227**Description** 2228 2229Pointer to the key that describes the Vorbis setup header. The value type is uint8_t. This key applies only to Vorbis decoders. 2230 2231**System capability**: SystemCapability.Multimedia.Media.CodecBase 2232 2233**Since**: 10 2234 2235 2236### OH_MD_KEY_TITLE 2237 2238``` 2239const char* OH_MD_KEY_TITLE 2240``` 2241 2242**Description** 2243 2244Pointer to the key that describes the title in a media file. The value type is string. 2245 2246**System capability**: SystemCapability.Multimedia.Media.CodecBase 2247 2248**Since**: 10 2249 2250 2251### OH_MD_KEY_TRACK_COUNT 2252 2253``` 2254const char* OH_MD_KEY_TRACK_COUNT 2255``` 2256 2257**Description** 2258 2259Pointer to the key that describes the number of tracks in a media file. The value type is int32_t. 2260 2261**System capability**: SystemCapability.Multimedia.Media.CodecBase 2262 2263**Since**: 10 2264 2265 2266### OH_MD_KEY_TRACK_TYPE 2267 2268``` 2269const char* OH_MD_KEY_TRACK_TYPE 2270``` 2271 2272**Description** 2273 2274Pointer to the key that describes the track type in a media file. The value type is int32_t. For details, see [OH_MediaType](#oh_mediatype-1). 2275 2276**System capability**: SystemCapability.Multimedia.Media.CodecBase 2277 2278**Since**: 9 2279 2280 2281### OH_MD_KEY_TRANSFER_CHARACTERISTICS 2282 2283``` 2284const char* OH_MD_KEY_TRANSFER_CHARACTERISTICS 2285``` 2286 2287**Description** 2288 2289Pointer to the key that describes the video transfer characteristics. The value type is int32_t. For details, see [OH_TransferCharacteristic](#oh_transfercharacteristic). The video transfer characteristics comply with Table 3 in the H.273 standard. 2290 2291**System capability**: SystemCapability.Multimedia.Media.CodecBase 2292 2293**Since**: 10 2294 2295### OH_MD_KEY_VIDEO_CROP_BOTTOM 2296 2297``` 2298const char* OH_MD_KEY_VIDEO_CROP_BOTTOM 2299``` 2300 2301**Description** 2302 2303Pointer to the key that describes the bottom coordinate (y) of the cropped rectangle. The value type is int32_t. The row at the bottom of the cropped rectangle is contained, and the row index starts from 0. This key is used only for video decoding. 2304 2305**System capability**: SystemCapability.Multimedia.Media.CodecBase 2306 2307**Since**: 12 2308 2309 2310### OH_MD_KEY_VIDEO_CROP_LEFT 2311 2312``` 2313const char* OH_MD_KEY_VIDEO_CROP_LEFT 2314``` 2315 2316**Description** 2317 2318Pointer to the key that describes the left coordinate (x) of the cropped rectangle. The value type is int32_t. The leftmost column of the cropped rectangle is contained, and the column index starts from 0. This key is used only for video decoding. 2319 2320**System capability**: SystemCapability.Multimedia.Media.CodecBase 2321 2322**Since**: 12 2323 2324 2325### OH_MD_KEY_VIDEO_CROP_RIGHT 2326 2327``` 2328const char* OH_MD_KEY_VIDEO_CROP_RIGHT 2329``` 2330 2331**Description** 2332 2333Pointer to the key that describes the right coordinate (x) of the cropped rectangle. The value type is int32_t. The rightmost column of the cropped rectangle is contained, and the column index starts from 0. This key is used only for video decoding. 2334 2335**System capability**: SystemCapability.Multimedia.Media.CodecBase 2336 2337**Since**: 12 2338 2339 2340### OH_MD_KEY_VIDEO_CROP_TOP 2341 2342``` 2343const char* OH_MD_KEY_VIDEO_CROP_TOP 2344``` 2345 2346**Description** 2347 2348Pointer to the key that describes the top coordinate (y) of the cropped rectangle. The value type is int32_t. The row at the top of the cropped rectangle is contained, and the row index starts from 0. This key is used only for video decoding. 2349 2350**System capability**: SystemCapability.Multimedia.Media.CodecBase 2351 2352**Since**: 12 2353 2354 2355### OH_MD_KEY_VIDEO_ENABLE_LOW_LATENCY 2356 2357``` 2358const char* OH_MD_KEY_VIDEO_ENABLE_LOW_LATENCY 2359``` 2360 2361**Description** 2362 2363Pointer to the key that describes the enabled status of low-latency video codec. The value type is int32_t. The value **1** means that low-latency video codec is enabled, and **0** means the opposite. 2364 2365If enabled, the input and output data held by the video encoder or decoder does not exceed the amount required by the codec standard. 2366 2367This key is optional and used only in the configuration phase. 2368 2369**System capability**: SystemCapability.Multimedia.Media.CodecBase 2370 2371**Since**: 12 2372 2373 2374### OH_MD_KEY_VIDEO_ENCODE_BITRATE_MODE 2375 2376``` 2377const char* OH_MD_KEY_VIDEO_ENCODE_BITRATE_MODE 2378``` 2379 2380**Description** 2381 2382Pointer to the key that describes the video encoding bit rate mode. The value type is int32_t. For details, see [OH_VideoEncodeBitrateMode](_video_encoder.md#oh_videoencodebitratemode). 2383 2384**System capability**: SystemCapability.Multimedia.Media.CodecBase 2385 2386**Since**: 9 2387 2388### OH_MD_KEY_VIDEO_ENCODER_ENABLE_TEMPORAL_SCALABILITY 2389 2390``` 2391const char* OH_MD_KEY_VIDEO_ENCODER_ENABLE_TEMPORAL_SCALABILITY 2392``` 2393 2394**Description** 2395 2396Pointer to the key that describes the enabled status of temporal scalability. The value type is int32_t. The value **1** means temporal scalability is enabled, and **0** means the opposite. 2397 2398Before using this variable, you can call [OH_AVCapability_IsFeatureSupported](_a_v_capability.md#oh_avcapability_isfeaturesupported) and use [VIDEO_ENCODER_TEMPORAL_SCALABILITY](_a_v_capability.md#oh_avcapabilityfeature) to check whether the video encoder supports temporal scalability. 2399 2400This key is optional and used only in the configuration phase of video encoding. 2401 2402**System capability**: SystemCapability.Multimedia.Media.CodecBase 2403 2404**Since**: 12 2405 2406 2407### OH_MD_KEY_VIDEO_ENCODER_LTR_FRAME_COUNT 2408 2409``` 2410const char* OH_MD_KEY_VIDEO_ENCODER_LTR_FRAME_COUNT 2411``` 2412**Description** 2413 2414Pointer to the key that describes the number of LTR frames. The value type is int32_t. The value must be within the supported value range. 2415 2416Before using this key, you can use the API [OH_AVCapability_GetFeatureProperties](_a_v_capability.md#oh_avcapability_getfeatureproperties) and the enum [VIDEO_ENCODER_LONG_TERM_REFERENCE](_a_v_capability.md#oh_avcapabilityfeature) to query the number of supported LTR frames. 2417 2418This key is optional and used only in the configuration phase of video encoding. 2419 2420**System capability**: SystemCapability.Multimedia.Media.CodecBase 2421 2422**Since**: 12 2423 2424 2425### OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_MARK_LTR 2426 2427``` 2428const char* OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_MARK_LTR 2429``` 2430**Description** 2431 2432Pointer to the key that describes the key that marks the current frame as an LTR frame. The value type is int32_t. The value **1** means that the frame is marked as an LTR frame, and **0** means the opposite. 2433 2434This key takes effect only after the number of LTR frames is configured. 2435 2436This key is optional and is used only for video encoding input rotation. The configuration takes effect immediately. 2437 2438**System capability**: SystemCapability.Multimedia.Media.CodecBase 2439 2440**Since**: 12 2441 2442 2443### OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_USE_LTR 2444 2445``` 2446const char* OH_MD_KEY_VIDEO_ENCODER_PER_FRAME_USE_LTR 2447``` 2448**Description** 2449 2450Pointer to the key that describes the LTR frame referenced by the current frame. The value type is int32_t. 2451 2452This key is optional and is used only for video encoding input rotation. The configuration takes effect immediately. 2453 2454**System capability**: SystemCapability.Multimedia.Media.CodecBase 2455 2456**Since**: 12 2457 2458 2459### OH_MD_KEY_VIDEO_ENCODER_QP_MAX 2460 2461``` 2462const char* OH_MD_KEY_VIDEO_ENCODER_QP_MAX 2463``` 2464 2465**Description** 2466 2467Pointer to the key that describes the maximum QP allowed by the video encoder. The value type is int32_t. 2468 2469This key is used in the configuration or parameter setting phase or takes effect immediately with the frame. 2470 2471**System capability**: SystemCapability.Multimedia.Media.CodecBase 2472 2473**Since**: 12 2474 2475 2476### OH_MD_KEY_VIDEO_ENCODER_QP_MIN 2477 2478``` 2479const char* OH_MD_KEY_VIDEO_ENCODER_QP_MIN 2480``` 2481 2482**Description** 2483 2484Pointer to the key that describes the minimum QP allowed by the video encoder. The value type is int32_t. 2485 2486This key is used in the configuration or parameter setting phase or takes effect immediately with the frame. 2487 2488**System capability**: SystemCapability.Multimedia.Media.CodecBase 2489 2490**Since**: 12 2491 2492 2493### OH_MD_KEY_VIDEO_ENCODER_QP_AVERAGE 2494 2495``` 2496const char* OH_MD_KEY_VIDEO_ENCODER_QP_AVERAGE 2497``` 2498 2499**Description** 2500 2501Pointer to the key that describes the average QP of video frames. The value type is int32_t. 2502 2503Pointer to the key that describes the average QP value of the current frame encoding block. It is output with OH_AVBuffer. 2504 2505**System capability**: SystemCapability.Multimedia.Media.CodecBase 2506 2507**Since**: 12 2508 2509 2510### OH_MD_KEY_VIDEO_ENCODER_MSE 2511 2512``` 2513const char* OH_MD_KEY_VIDEO_ENCODER_MSE 2514``` 2515 2516**Description** 2517 2518Pointer to the key that describes the MSE of video frames. The value type is double. 2519 2520Pointer to the key that describes the MSE of the current frame encoding block. It is output with OH_AVBuffer. 2521 2522**System capability**: SystemCapability.Multimedia.Media.CodecBase 2523 2524**Since**: 12 2525 2526 2527### OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_REFERENCE_MODE 2528 2529``` 2530const char* OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_REFERENCE_MODE 2531``` 2532 2533**Description** 2534 2535Pointer to the key that describes the reference mode in a temporal image group. The value type is int32_t. For details, see [OH_TemporalGopReferenceMode](#oh_temporalgopreferencemode). This key is valid only when temporal scalability is enabled. 2536 2537This key is optional and used only in the configuration phase of video encoding. 2538 2539**System capability**: SystemCapability.Multimedia.Media.CodecBase 2540 2541**Since**: 12 2542 2543 2544### OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_SIZE 2545 2546``` 2547const char* OH_MD_KEY_VIDEO_ENCODER_TEMPORAL_GOP_SIZE 2548``` 2549 2550**Description** 2551 2552Pointer to the key that describes the size of a temporal image group. The value type is int32_t. This key is valid only when temporal scalability is enabled. 2553 2554This key is optional and used only in the configuration phase of video encoding. 2555 2556**System capability**: SystemCapability.Multimedia.Media.CodecBase 2557 2558**Since**: 12 2559 2560 2561### OH_MD_KEY_VIDEO_IS_HDR_VIVID 2562 2563``` 2564const char* OH_MD_KEY_VIDEO_IS_HDR_VIVID 2565``` 2566 2567**Description** 2568 2569Pointer to the key that describes whether the video track in a media file is HDR Vivid. The value type is int32_t. This key is used for both muxing and demuxing. 2570 2571**System capability**: SystemCapability.Multimedia.Media.CodecBase 2572 2573**Since**: 11 2574 2575 2576### OH_MD_KEY_DECODING_TIMESTAMP 2577 2578``` 2579const char* OH_MD_KEY_DECODING_TIMESTAMP 2580``` 2581 2582**Description** 2583 2584Pointer to the key that describes the decoding timestamp corresponding to the audio, video, or subtitle sample carried in AVBuffer, in microseconds. The value type is int64_t. 2585 2586**System capability**: SystemCapability.Multimedia.Media.CodecBase 2587 2588**Since**: 12 2589 2590 2591### OH_MD_KEY_BUFFER_DURATION 2592 2593``` 2594const char* OH_MD_KEY_BUFFER_DURATION 2595``` 2596 2597**Description** 2598 2599Pointer to the key that describes the duration corresponding to the audio, video, or subtitle sample carried in AVBuffer, in microseconds. The value type is int64_t. 2600 2601**System capability**: SystemCapability.Multimedia.Media.CodecBase 2602 2603**Since**: 12 2604 2605 2606### OH_MD_KEY_START_TIME 2607 2608``` 2609const char* OH_MD_KEY_START_TIME 2610``` 2611 2612**Description** 2613 2614Pointer to the key that describes the start time of the first frame in a media file. The value type is int64_t. 2615 2616**System capability**: SystemCapability.Multimedia.Media.CodecBase 2617 2618**Since**: 12 2619 2620### OH_MD_KEY_TRACK_START_TIME 2621 2622``` 2623const char* OH_MD_KEY_TRACK_START_TIME 2624``` 2625 2626**Description** 2627 2628Pointer to the key that describes the track start time. The value type is int64_t. 2629 2630**System capability**: SystemCapability.Multimedia.Media.CodecBase 2631 2632**Since**: 12 2633 2634 2635### OH_MD_KEY_VIDEO_DECODER_OUTPUT_COLOR_SPACE 2636 2637``` 2638const char* OH_MD_KEY_VIDEO_DECODER_OUTPUT_COLOR_SPACE 2639``` 2640 2641**Description** 2642 2643Pointer to the key that describes the output color space of the video decoder. The value type is int32_t. 2644 2645The supported value is **OH_COLORSPACE_BT709_LIMIT**. For details, see [OH_NativeBuffer_ColorSpace](../../reference/apis-arkgraphics2d/_o_h___native_buffer.md#oh_nativebuffer_colorspace-1). 2646 2647It is used when [OH_VideoDecoder_Configure](_video_decoder.md#oh_videodecoder_configure) is called. 2648 2649If Color Space Conversion (CSC) is supported and this key is configured, the video decoder automatically transcodes the HDR Vivid video to the BT.709 SDR video. 2650 2651If CSC function not supported, the error code [AV_ERR_VIDEO_UNSUPPORTED_COLOR_SPACE_CONVERSION](_core.md#oh_averrcode-1) is returned when [OH_VideoDecoder_Configure](_video_decoder.md#oh_videodecoder_configure) is called. 2652 2653If the input video is not an HDR Vivid video, the callback function [OH_AVCodecOnError](#oh_avcodeconerror) is invoked to report the error code [AV_ERR_VIDEO_UNSUPPORTED_COLOR_SPACE_CONVERSION](_core.md#oh_averrcode-1). 2654 2655**System capability**: SystemCapability.Multimedia.Media.CodecBase 2656 2657**Since**: 12 2658 2659 2660### OH_MD_KEY_VIDEO_PER_FRAME_IS_LTR 2661 2662``` 2663const char* OH_MD_KEY_VIDEO_PER_FRAME_IS_LTR 2664``` 2665**Description** 2666 2667Pointer to the key that describes the key that specifies whether the frame corresponding to the stream output from the current OH_AVBuffer is marked as an LTR frame. The value type is int32_t. The value **1** means that the frame is an LTR frame, and **0** means the opposite. 2668 2669This key is optional and is used only for video encoding output rotation. 2670 2671It indicates the attribute of a frame. 2672 2673**System capability**: SystemCapability.Multimedia.Media.CodecBase 2674 2675**Since**: 12 2676 2677 2678### OH_MD_KEY_VIDEO_PER_FRAME_POC 2679 2680``` 2681const char* OH_MD_KEY_VIDEO_PER_FRAME_POC 2682``` 2683**Description** 2684 2685Pointer to the key that describes the POC of the frame. The value type is int32_t. 2686 2687This key is optional and is used only for video encoding output rotation. 2688 2689It indicates the attribute of a frame. 2690 2691**System capability**: SystemCapability.Multimedia.Media.CodecBase 2692 2693**Since**: 12 2694 2695 2696### OH_MD_KEY_VIDEO_PIC_HEIGHT 2697 2698``` 2699const char* OH_MD_KEY_VIDEO_PIC_HEIGHT 2700``` 2701 2702**Description** 2703 2704Pointer to the key that describes the height of the video frame. The value type is int32_t. 2705 2706When [OH_VideoDecoder_GetOutputDescription](_video_decoder.md#oh_videodecoder_getoutputdescription) is called during video decoding, the height can be parsed from the returned **OH_AVFormat** instance. 2707 2708When the decoded output stream<!--RP2--><!--RP2End--> changes, the height can be parsed from the **OH_AVForamt** instance returned by [OH_AVCodecOnStreamChanged](#oh_avcodeconstreamchanged). 2709 2710**System capability**: SystemCapability.Multimedia.Media.CodecBase 2711 2712**Since**: 12 2713 2714 2715### OH_MD_KEY_VIDEO_PIC_WIDTH 2716 2717``` 2718const char* OH_MD_KEY_VIDEO_PIC_WIDTH 2719``` 2720 2721**Description** 2722 2723Pointer to the key that describes the width of the video frame. The value type is int32_t. 2724 2725When [OH_VideoDecoder_GetOutputDescription](_video_decoder.md#oh_videodecoder_getoutputdescription) is called during video decoding, the width can be parsed from the returned **OH_AVFormat** instance. 2726 2727When the decoded output stream<!--RP2--><!--RP2End--> changes, the width can be parsed from the **OH_AVForamt** instance returned by [OH_AVCodecOnStreamChanged](#oh_avcodeconstreamchanged). 2728 2729**System capability**: SystemCapability.Multimedia.Media.CodecBase 2730 2731**Since**: 12 2732 2733 2734### OH_MD_KEY_VIDEO_SLICE_HEIGHT 2735 2736``` 2737const char* OH_MD_KEY_VIDEO_SLICE_HEIGHT 2738``` 2739**Description** 2740 2741Pointer to the key that describes the height of the video frame. The value type is int32_t. 2742 2743The height is the number of rows that must be offset from the top of the Y plane to the top of the U plane. Essentially, the offset of the U plane is sliceHeight \* stride. 2744 2745The height of the U/V plane can be calculated based on the color format, but it is usually not defined and depends on the device and version. 2746 2747**System capability**: SystemCapability.Multimedia.Media.CodecBase 2748 2749**Since**: 12 2750 2751 2752### OH_MD_KEY_VIDEO_STRIDE 2753 2754``` 2755const char* OH_MD_KEY_VIDEO_STRIDE 2756``` 2757**Description** 2758 2759Pointer to the key that describes the stride of the video frame. The value type is int32_t. 2760 2761The stride is the difference between the index of the pixel and the index of the pixel right below. 2762 2763For the YUV420 format, the stride corresponds to the Y plane. The stride of the U/V plane can be calculated based on the color format, but it is usually not defined and depends on the device and version. 2764 2765**System capability**: SystemCapability.Multimedia.Media.CodecBase 2766 2767**Since**: 12 2768 2769 2770### OH_MD_KEY_WIDTH 2771 2772``` 2773const char* OH_MD_KEY_WIDTH 2774``` 2775 2776**Description** 2777 2778Pointer to the key that describes the video width. The value type is int32_t. 2779 2780**System capability**: SystemCapability.Multimedia.Media.CodecBase 2781 2782**Since**: 9 2783 2784 2785### OH_MD_MAX_INPUT_BUFFER_COUNT 2786 2787``` 2788const char* OH_MD_MAX_INPUT_BUFFER_COUNT 2789``` 2790 2791**Description** 2792 2793Pointer to the key that describes the maximum number of input buffers. The value type is int32_t. 2794 2795**System capability**: SystemCapability.Multimedia.Media.CodecBase 2796 2797**Since**: 10 2798 2799 2800### OH_MD_MAX_OUTPUT_BUFFER_COUNT 2801 2802``` 2803const char* OH_MD_MAX_OUTPUT_BUFFER_COUNT 2804``` 2805 2806**Description** 2807 2808Pointer to the key that describes the maximum number of output buffers. The value type is int32_t. 2809 2810**System capability**: SystemCapability.Multimedia.Media.CodecBase 2811 2812**Since**: 10 2813 2814 2815### OH_MD_KEY_VIDEO_SAR 2816 2817``` 2818const char* OH_MD_KEY_VIDEO_SAR 2819``` 2820 2821**Description** 2822 2823Pointer to the key that describes the aspect ratio of the sample. The value type is double. 2824 2825**System capability**: SystemCapability.Multimedia.Media.CodecBase 2826 2827**Since**: 12 2828