1/* 2 * Interface to libshine for mp3 encoding 3 * Copyright (c) 2012 Paul B Mahol 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <shine/layer3.h> 23 24#include "libavutil/channel_layout.h" 25#include "libavutil/intreadwrite.h" 26#include "audio_frame_queue.h" 27#include "avcodec.h" 28#include "codec_internal.h" 29#include "encode.h" 30#include "mpegaudio.h" 31#include "mpegaudiodecheader.h" 32 33#define BUFFER_SIZE (4096 * 20) 34 35typedef struct SHINEContext { 36 shine_config_t config; 37 shine_t shine; 38 uint8_t buffer[BUFFER_SIZE]; 39 int buffer_index; 40 AudioFrameQueue afq; 41} SHINEContext; 42 43static av_cold int libshine_encode_init(AVCodecContext *avctx) 44{ 45 SHINEContext *s = avctx->priv_data; 46 47 if (avctx->ch_layout.nb_channels <= 0 || avctx->ch_layout.nb_channels > 2){ 48 av_log(avctx, AV_LOG_ERROR, "only mono or stereo is supported\n"); 49 return AVERROR(EINVAL); 50 } 51 52 shine_set_config_mpeg_defaults(&s->config.mpeg); 53 if (avctx->bit_rate) 54 s->config.mpeg.bitr = avctx->bit_rate / 1000; 55 s->config.mpeg.mode = avctx->ch_layout.nb_channels == 2 ? STEREO : MONO; 56 s->config.wave.samplerate = avctx->sample_rate; 57 s->config.wave.channels = avctx->ch_layout.nb_channels == 2 ? PCM_STEREO : PCM_MONO; 58 if (shine_check_config(s->config.wave.samplerate, s->config.mpeg.bitr) < 0) { 59 av_log(avctx, AV_LOG_ERROR, "invalid configuration\n"); 60 return AVERROR(EINVAL); 61 } 62 s->shine = shine_initialise(&s->config); 63 if (!s->shine) 64 return AVERROR(ENOMEM); 65 avctx->frame_size = shine_samples_per_pass(s->shine); 66 ff_af_queue_init(avctx, &s->afq); 67 return 0; 68} 69 70static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, 71 const AVFrame *frame, int *got_packet_ptr) 72{ 73 SHINEContext *s = avctx->priv_data; 74 MPADecodeHeader hdr; 75 unsigned char *data; 76 int written; 77 int ret, len; 78 79 if (frame) 80 data = shine_encode_buffer(s->shine, (int16_t **)frame->data, &written); 81 else 82 data = shine_flush(s->shine, &written); 83 if (written < 0) 84 return -1; 85 if (written > 0) { 86 if (s->buffer_index + written > BUFFER_SIZE) { 87 av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n"); 88 return AVERROR_BUG; 89 } 90 memcpy(s->buffer + s->buffer_index, data, written); 91 s->buffer_index += written; 92 } 93 if (frame) { 94 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) 95 return ret; 96 } 97 98 if (s->buffer_index < 4 || !s->afq.frame_count) 99 return 0; 100 if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) { 101 av_log(avctx, AV_LOG_ERROR, "free format output not supported\n"); 102 return -1; 103 } 104 105 len = hdr.frame_size; 106 if (len <= s->buffer_index) { 107 if ((ret = ff_get_encode_buffer(avctx, avpkt, len, 0))) 108 return ret; 109 memcpy(avpkt->data, s->buffer, len); 110 s->buffer_index -= len; 111 memmove(s->buffer, s->buffer + len, s->buffer_index); 112 113 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, 114 &avpkt->duration); 115 116 *got_packet_ptr = 1; 117 } 118 return 0; 119} 120 121static av_cold int libshine_encode_close(AVCodecContext *avctx) 122{ 123 SHINEContext *s = avctx->priv_data; 124 125 ff_af_queue_close(&s->afq); 126 shine_close(s->shine); 127 return 0; 128} 129 130static const int libshine_sample_rates[] = { 131 44100, 48000, 32000, 0 132}; 133 134const FFCodec ff_libshine_encoder = { 135 .p.name = "libshine", 136 .p.long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"), 137 .p.type = AVMEDIA_TYPE_AUDIO, 138 .p.id = AV_CODEC_ID_MP3, 139 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY, 140 .priv_data_size = sizeof(SHINEContext), 141 .init = libshine_encode_init, 142 FF_CODEC_ENCODE_CB(libshine_encode_frame), 143 .close = libshine_encode_close, 144 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, 145 AV_SAMPLE_FMT_NONE }, 146 .p.supported_samplerates = libshine_sample_rates, 147#if FF_API_OLD_CHANNEL_LAYOUT 148 .p.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 149 AV_CH_LAYOUT_STEREO, 150 0 }, 151#endif 152 .p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO, 153 AV_CHANNEL_LAYOUT_STEREO, 154 { 0 }, 155 }, 156 .p.wrapper_name = "libshine", 157}; 158