aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Videotoolbox hardware acceleration
*
* copyright (c) 2012 Sebastien Zwickert
*
* 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_VIDEOTOOLBOX_H
#define AVCODEC_VIDEOTOOLBOX_H
/**
* @file
* @ingroup lavc_codec_hwaccel_videotoolbox
* Public libavcodec Videotoolbox header.
*/
#include <stdint.h>
#define Picture QuickdrawPicture
#include <VideoToolbox/VideoToolbox.h>
#undef Picture
#include "libavcodec/avcodec.h"
/**
* This struct holds all the information that needs to be passed
* between the caller and libavcodec for initializing Videotoolbox decoding.
* Its size is not a part of the public ABI, it must be allocated with
* av_videotoolbox_alloc_context() and freed with av_free().
*/
typedef struct AVVideotoolboxContext {
/**
* Videotoolbox decompression session object.
* Created and freed the caller.
*/
VTDecompressionSessionRef session;
/**
* The output callback that must be passed to the session.
* Set by av_videottoolbox_default_init()
*/
VTDecompressionOutputCallback output_callback;
/**
* CVPixelBuffer Format Type that Videotoolbox will use for decoded frames.
* set by the caller. If this is set to 0, then no specific format is
* requested from the decoder, and its native format is output.
*/
OSType cv_pix_fmt_type;
/**
* CoreMedia Format Description that Videotoolbox will use to create the decompression session.
* Set by the caller.
*/
CMVideoFormatDescriptionRef cm_fmt_desc;
/**
* CoreMedia codec type that Videotoolbox will use to create the decompression session.
* Set by the caller.
*/
int cm_codec_type;
} AVVideotoolboxContext;
/**
* Allocate and initialize a Videotoolbox context.
*
* This function should be called from the get_format() callback when the caller
* selects the AV_PIX_FMT_VIDETOOLBOX format. The caller must then create
* the decoder object (using the output callback provided by libavcodec) that
* will be used for Videotoolbox-accelerated decoding.
*
* When decoding with Videotoolbox is finished, the caller must destroy the decoder
* object and free the Videotoolbox context using av_free().
*
* @return the newly allocated context or NULL on failure
*/
AVVideotoolboxContext *av_videotoolbox_alloc_context(void);
/**
* This is a convenience function that creates and sets up the Videotoolbox context using
* an internal implementation.
*
* @param avctx the corresponding codec context
*
* @return >= 0 on success, a negative AVERROR code on failure
*/
int av_videotoolbox_default_init(AVCodecContext *avctx);
/**
* This is a convenience function that creates and sets up the Videotoolbox context using
* an internal implementation.
*
* @param avctx the corresponding codec context
* @param vtctx the Videotoolbox context to use
*
* @return >= 0 on success, a negative AVERROR code on failure
*/
int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx);
/**
* This function must be called to free the Videotoolbox context initialized with
* av_videotoolbox_default_init().
*
* @param avctx the corresponding codec context
*/
void av_videotoolbox_default_free(AVCodecContext *avctx);
/**
* @}
*/
#endif /* AVCODEC_VIDEOTOOLBOX_H */
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