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ade7c1a232
If AVVideotoolboxContext.cv_pix_fmt_type is set to 0, don't set the kCVPixelBufferPixelFormatTypeKey value on the VT decoder. This makes VT output its native format, which can be much faster on some hardware iterations (if the native format does not match with the requested format, it will be converted, which is slow). The default is still forcing nv12.
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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