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128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* Videotoolbox hardware acceleration
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*
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* copyright (c) 2012 Sebastien Zwickert
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_VIDEOTOOLBOX_H
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#define AVCODEC_VIDEOTOOLBOX_H
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/**
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* @file
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* @ingroup lavc_codec_hwaccel_videotoolbox
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* Public libavcodec Videotoolbox header.
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*/
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#include <stdint.h>
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#define Picture QuickdrawPicture
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#include <VideoToolbox/VideoToolbox.h>
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#undef Picture
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#include "libavcodec/avcodec.h"
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/**
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* This struct holds all the information that needs to be passed
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* between the caller and libavcodec for initializing Videotoolbox decoding.
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* Its size is not a part of the public ABI, it must be allocated with
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* av_videotoolbox_alloc_context() and freed with av_free().
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*/
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typedef struct AVVideotoolboxContext {
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/**
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* Videotoolbox decompression session object.
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* Created and freed the caller.
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*/
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VTDecompressionSessionRef session;
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/**
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* The output callback that must be passed to the session.
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* Set by av_videottoolbox_default_init()
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*/
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VTDecompressionOutputCallback output_callback;
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/**
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* CVPixelBuffer Format Type that Videotoolbox will use for decoded frames.
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* set by the caller. If this is set to 0, then no specific format is
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* requested from the decoder, and its native format is output.
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*/
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OSType cv_pix_fmt_type;
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/**
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* CoreMedia Format Description that Videotoolbox will use to create the decompression session.
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* Set by the caller.
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*/
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CMVideoFormatDescriptionRef cm_fmt_desc;
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/**
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* CoreMedia codec type that Videotoolbox will use to create the decompression session.
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* Set by the caller.
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*/
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int cm_codec_type;
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} AVVideotoolboxContext;
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/**
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* Allocate and initialize a Videotoolbox context.
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*
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* This function should be called from the get_format() callback when the caller
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* selects the AV_PIX_FMT_VIDETOOLBOX format. The caller must then create
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* the decoder object (using the output callback provided by libavcodec) that
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* will be used for Videotoolbox-accelerated decoding.
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*
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* When decoding with Videotoolbox is finished, the caller must destroy the decoder
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* object and free the Videotoolbox context using av_free().
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*
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* @return the newly allocated context or NULL on failure
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*/
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AVVideotoolboxContext *av_videotoolbox_alloc_context(void);
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/**
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* This is a convenience function that creates and sets up the Videotoolbox context using
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* an internal implementation.
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*
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* @param avctx the corresponding codec context
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*
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* @return >= 0 on success, a negative AVERROR code on failure
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*/
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int av_videotoolbox_default_init(AVCodecContext *avctx);
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/**
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* This is a convenience function that creates and sets up the Videotoolbox context using
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* an internal implementation.
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*
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* @param avctx the corresponding codec context
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* @param vtctx the Videotoolbox context to use
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*
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* @return >= 0 on success, a negative AVERROR code on failure
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*/
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int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx);
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/**
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* This function must be called to free the Videotoolbox context initialized with
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* av_videotoolbox_default_init().
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*
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* @param avctx the corresponding codec context
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*/
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void av_videotoolbox_default_free(AVCodecContext *avctx);
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/**
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* @}
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*/
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#endif /* AVCODEC_VIDEOTOOLBOX_H */
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