/* * 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.
*/
typedefstruct 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;
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