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vdpau.h (7893B)

---

/*
* 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 <vdpau/vdpau_x11.h>
#include "libavutil/avconfig.h"
#include "libavutil/attributes.h"

#include "avcodec.h"
#include "version.h"

#if FF_API_BUFS_VDPAU
union AVVDPAUPictureInfo {
   VdpPictureInfoH264        h264;
   VdpPictureInfoMPEG1Or2    mpeg;
   VdpPictureInfoVC1          vc1;
   VdpPictureInfoMPEG4Part2 mpeg4;
};
#endif

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;

#if FF_API_BUFS_VDPAU
   /**
    * VDPAU picture information
    *
    * Set by libavcodec.
    */
   attribute_deprecated
   union AVVDPAUPictureInfo info;

   /**
    * Allocated size of the bitstream_buffers table.
    *
    * Set by libavcodec.
    */
   attribute_deprecated
   int bitstream_buffers_allocated;

   /**
    * Useful bitstream buffers in the bitstream buffers table.
    *
    * Set by libavcodec.
    */
   attribute_deprecated
   int bitstream_buffers_used;

  /**
    * Table of bitstream buffers.
    * The user is responsible for freeing this buffer using av_freep().
    *
    * Set by libavcodec.
    */
   attribute_deprecated
   VdpBitstreamBuffer *bitstream_buffers;
#endif
   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);

#if FF_API_VDPAU_PROFILE
/**
* Get a decoder profile that should be used for initializing a VDPAU decoder.
* Should be called from the AVCodecContext.get_format() callback.
*
* @deprecated Use av_vdpau_bind_context() instead.
*
* @param avctx the codec context being used for decoding the stream
* @param profile a pointer into which the result will be written on success.
*                The contents of profile are undefined if this function returns
*                an error.
*
* @return 0 on success (non-negative), a negative AVERROR on failure.
*/
attribute_deprecated
int av_vdpau_get_profile(AVCodecContext *avctx, VdpDecoderProfile *profile);
#endif

#if FF_API_CAP_VDPAU
/** @brief The videoSurface is used for rendering. */
#define FF_VDPAU_STATE_USED_FOR_RENDER 1

/**
* @brief The videoSurface is needed for reference/prediction.
* The codec manipulates this.
*/
#define FF_VDPAU_STATE_USED_FOR_REFERENCE 2

/**
* @brief This structure is used as a callback between the FFmpeg
* decoder (vd_) and presentation (vo_) module.
* This is used for defining a video frame containing surface,
* picture parameter, bitstream information etc which are passed
* between the FFmpeg decoder and its clients.
*/
struct vdpau_render_state {
   VdpVideoSurface surface; ///< Used as rendered surface, never changed.

   int state; ///< Holds FF_VDPAU_STATE_* values.

   /** picture parameter information for all supported codecs */
   union AVVDPAUPictureInfo info;

   /** Describe size/location of the compressed video data.
       Set to 0 when freeing bitstream_buffers. */
   int bitstream_buffers_allocated;
   int bitstream_buffers_used;
   /** The user is responsible for freeing this buffer using av_freep(). */
   VdpBitstreamBuffer *bitstream_buffers;
};
#endif

/* @}*/

#endif /* AVCODEC_VDPAU_H */