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hwaccel_internal.h (5839B)

---

/*
* 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
*/

/**
* Header providing the internals of AVHWAccel.
*/

#ifndef AVCODEC_HWACCEL_INTERNAL_H
#define AVCODEC_HWACCEL_INTERNAL_H

#include <stdint.h>

#include "avcodec.h"
#include "libavutil/refstruct.h"

#define HWACCEL_CAP_ASYNC_SAFE      (1 << 0)
#define HWACCEL_CAP_THREAD_SAFE     (1 << 1)

typedef struct FFHWAccel {
   /**
    * The public AVHWAccel. See avcodec.h for it.
    */
   AVHWAccel p;

   /**
    * Allocate a custom buffer
    */
   int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);

   /**
    * Called at the beginning of each frame or field picture.
    *
    * Meaningful frame information (codec specific) is guaranteed to
    * be parsed at this point. This function is mandatory.
    *
    * Note that buf can be NULL along with buf_size set to 0.
    * Otherwise, this means the whole frame is available at this point.
    *
    * @param avctx the codec context
    * @param buf the frame data buffer base
    * @param buf_size the size of the frame in bytes
    * @return zero if successful, a negative value otherwise
    */
   int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);

   /**
    * Callback for parameter data (SPS/PPS/VPS etc).
    *
    * Useful for hardware decoders which keep persistent state about the
    * video parameters, and need to receive any changes to update that state.
    *
    * @param avctx the codec context
    * @param type the nal unit type
    * @param buf the nal unit data buffer
    * @param buf_size the size of the nal unit in bytes
    * @return zero if successful, a negative value otherwise
    */
   int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);

   /**
    * Callback for each slice.
    *
    * Meaningful slice information (codec specific) is guaranteed to
    * be parsed at this point. This function is mandatory.
    *
    * @param avctx the codec context
    * @param buf the slice data buffer base
    * @param buf_size the size of the slice in bytes
    * @return zero if successful, a negative value otherwise
    */
   int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);

   /**
    * Called at the end of each frame or field picture.
    *
    * The whole picture is parsed at this point and can now be sent
    * to the hardware accelerator. This function is mandatory.
    *
    * @param avctx the codec context
    * @return zero if successful, a negative value otherwise
    */
   int (*end_frame)(AVCodecContext *avctx);

   /**
    * Size of per-frame hardware accelerator private data.
    *
    * Private data is allocated with av_mallocz() before
    * AVCodecContext.get_buffer() and deallocated after
    * AVCodecContext.release_buffer().
    */
   int frame_priv_data_size;

   /**
    * Size of the private data to allocate in
    * AVCodecInternal.hwaccel_priv_data.
    */
   int priv_data_size;

   /**
    * Internal hwaccel capabilities.
    */
   int caps_internal;

   /**
    * Initialize the hwaccel private data.
    *
    * This will be called from ff_get_format(), after hwaccel and
    * hwaccel_context are set and the hwaccel private data in AVCodecInternal
    * is allocated.
    */
   int (*init)(AVCodecContext *avctx);

   /**
    * Uninitialize the hwaccel private data.
    *
    * This will be called from get_format() or ff_codec_close(), after hwaccel
    * and hwaccel_context are already uninitialized.
    */
   int (*uninit)(AVCodecContext *avctx);

   /**
    * Fill the given hw_frames context with current codec parameters. Called
    * from get_format. Refer to avcodec_get_hw_frames_parameters() for
    * details.
    *
    * This CAN be called before AVHWAccel.init is called, and you must assume
    * that avctx->hwaccel_priv_data is invalid.
    */
   int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);

   /**
    * Copy necessary context variables from a previous thread context to the current one.
    * For thread-safe hwaccels only.
    */
   int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);

   /**
    * Callback to free the hwaccel-specific frame data.
    *
    * @param hwctx a pointer to an AVHWDeviceContext.
    * @param data the per-frame hardware accelerator private data to be freed.
    */
   void (*free_frame_priv)(AVRefStructOpaque hwctx, void *data);

   /**
    * Callback to flush the hwaccel state.
    */
   void (*flush)(AVCodecContext *avctx);
} FFHWAccel;

static inline const FFHWAccel *ffhwaccel(const AVHWAccel *codec)
{
   return (const FFHWAccel*)codec;
}

#define FF_HW_CALL(avctx, function, ...) \
       (ffhwaccel((avctx)->hwaccel)->function((avctx), __VA_ARGS__))

#define FF_HW_SIMPLE_CALL(avctx, function) \
       (ffhwaccel((avctx)->hwaccel)->function(avctx))

#define FF_HW_HAS_CB(avctx, function) \
       ((avctx)->hwaccel && ffhwaccel((avctx)->hwaccel)->function)

#endif /* AVCODEC_HWACCEL_INTERNAL */