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/*
* 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"
#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 avcodec_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)(void *hwctx, uint8_t *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 */
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