xref: /third_party/ffmpeg/libavcodec/vdpau.h (revision cabdff1a)

/*
 * The Video Decode and Presentation API for UNIX (VDPAU) is used for
 * hardware-accelerated decoding of MPEG-1/2, H.264 and VC-1.
 *
 * Copyright (C) 2008 NVIDIA
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_VDPAU_H
#define AVCODEC_VDPAU_H

/**
 * @file
 * @ingroup lavc_codec_hwaccel_vdpau
 * Public libavcodec VDPAU header.
 */


/**
 * @defgroup lavc_codec_hwaccel_vdpau VDPAU Decoder and Renderer
 * @ingroup lavc_codec_hwaccel
 *
 * VDPAU hardware acceleration has two modules
 * - VDPAU decoding
 * - VDPAU presentation
 *
 * The VDPAU decoding module parses all headers using FFmpeg
 * parsing mechanisms and uses VDPAU for the actual decoding.
 *
 * As per the current implementation, the actual decoding
 * and rendering (API calls) are done as part of the VDPAU
 * presentation (vo_vdpau.c) module.
 *
 * @{
 */

#include <vdpau/vdpau.h>

#include "libavutil/avconfig.h"
#include "libavutil/attributes.h"

#include "avcodec.h"

struct AVCodecContext;
struct AVFrame;

typedef int (*AVVDPAU_Render2)(struct AVCodecContext *, struct AVFrame *,
                               const VdpPictureInfo *, uint32_t,
                               const VdpBitstreamBuffer *);

/**
 * This structure is used to share data between the libavcodec library and
 * the client video application.
 * The user shall allocate the structure via the av_alloc_vdpau_hwaccel
 * function and make it available as
 * AVCodecContext.hwaccel_context. Members can be set by the user once
 * during initialization or through each AVCodecContext.get_buffer()
 * function call. In any case, they must be valid prior to calling
 * decoding functions.
 *
 * The size of this structure is not a part of the public ABI and must not
 * be used outside of libavcodec. Use av_vdpau_alloc_context() to allocate an
 * AVVDPAUContext.
 */
typedef struct AVVDPAUContext {
    /**
     * VDPAU decoder handle
     *
     * Set by user.
     */
    VdpDecoder decoder;

    /**
     * VDPAU decoder render callback
     *
     * Set by the user.
     */
    VdpDecoderRender *render;

    AVVDPAU_Render2 render2;
} AVVDPAUContext;

/**
 * @brief allocation function for AVVDPAUContext
 *
 * Allows extending the struct without breaking API/ABI
 */
AVVDPAUContext *av_alloc_vdpaucontext(void);

AVVDPAU_Render2 av_vdpau_hwaccel_get_render2(const AVVDPAUContext *);
void av_vdpau_hwaccel_set_render2(AVVDPAUContext *, AVVDPAU_Render2);

/**
 * Associate a VDPAU device with a codec context for hardware acceleration.
 * This function is meant to be called from the get_format() codec callback,
 * or earlier. It can also be called after avcodec_flush_buffers() to change
 * the underlying VDPAU device mid-stream (e.g. to recover from non-transparent
 * display preemption).
 *
 * @note get_format() must return AV_PIX_FMT_VDPAU if this function completes
 * successfully.
 *
 * @param avctx decoding context whose get_format() callback is invoked
 * @param device VDPAU device handle to use for hardware acceleration
 * @param get_proc_address VDPAU device driver
 * @param flags zero of more OR'd AV_HWACCEL_FLAG_* flags
 *
 * @return 0 on success, an AVERROR code on failure.
 */
int av_vdpau_bind_context(AVCodecContext *avctx, VdpDevice device,
                          VdpGetProcAddress *get_proc_address, unsigned flags);

/**
 * Gets the parameters to create an adequate VDPAU video surface for the codec
 * context using VDPAU hardware decoding acceleration.
 *
 * @note Behavior is undefined if the context was not successfully bound to a
 * VDPAU device using av_vdpau_bind_context().
 *
 * @param avctx the codec context being used for decoding the stream
 * @param type storage space for the VDPAU video surface chroma type
 *              (or NULL to ignore)
 * @param width storage space for the VDPAU video surface pixel width
 *              (or NULL to ignore)
 * @param height storage space for the VDPAU video surface pixel height
 *              (or NULL to ignore)
 *
 * @return 0 on success, a negative AVERROR code on failure.
 */
int av_vdpau_get_surface_parameters(AVCodecContext *avctx, VdpChromaType *type,
                                    uint32_t *width, uint32_t *height);

/**
 * Allocate an AVVDPAUContext.
 *
 * @return Newly-allocated AVVDPAUContext or NULL on failure.
 */
AVVDPAUContext *av_vdpau_alloc_context(void);

/* @}*/

#endif /* AVCODEC_VDPAU_H */