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libavcodec
vda.h
Go to the documentation of this file.
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/*
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* VDA HW acceleration
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*
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* copyright (c) 2011 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_VDA_H
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#define AVCODEC_VDA_H
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/**
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* @file
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* @ingroup lavc_codec_hwaccel_vda
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* Public libavcodec VDA header.
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*/
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#include "
libavcodec/avcodec.h
"
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#include <stdint.h>
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// emmintrin.h is unable to compile with -std=c99 -Werror=missing-prototypes
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// http://openradar.appspot.com/8026390
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#undef __GNUC_STDC_INLINE__
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#define Picture QuickdrawPicture
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#include <VideoDecodeAcceleration/VDADecoder.h>
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#undef Picture
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#include "
libavcodec/version.h
"
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// extra flags not defined in VDADecoder.h
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enum
{
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kVDADecodeInfo_Asynchronous
= 1UL << 0,
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kVDADecodeInfo_FrameDropped
= 1UL << 1
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};
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/**
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* @defgroup lavc_codec_hwaccel_vda VDA
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* @ingroup lavc_codec_hwaccel
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*
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* @{
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*/
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/**
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* This structure is used to provide the necessary configurations and data
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* to the VDA FFmpeg HWAccel implementation.
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*
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* The application must make it available as AVCodecContext.hwaccel_context.
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*/
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struct
vda_context
{
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/**
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* VDA decoder object.
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*
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* - encoding: unused
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* - decoding: Set/Unset by libavcodec.
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*/
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VDADecoder
decoder
;
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/**
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* The Core Video pixel buffer that contains the current image data.
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*
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* encoding: unused
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* decoding: Set by libavcodec. Unset by user.
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*/
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CVPixelBufferRef
cv_buffer
;
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/**
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* Use the hardware decoder in synchronous mode.
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*
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* encoding: unused
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* decoding: Set by user.
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*/
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int
use_sync_decoding
;
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/**
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* The frame width.
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*
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* - encoding: unused
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* - decoding: Set/Unset by user.
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*/
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int
width
;
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/**
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* The frame height.
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*
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* - encoding: unused
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* - decoding: Set/Unset by user.
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*/
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int
height
;
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/**
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* The frame format.
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*
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* - encoding: unused
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* - decoding: Set/Unset by user.
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*/
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int
format
;
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/**
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* The pixel format for output image buffers.
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*
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* - encoding: unused
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* - decoding: Set/Unset by user.
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*/
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OSType
cv_pix_fmt_type
;
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/**
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* unused
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*/
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uint8_t
*
priv_bitstream
;
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/**
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* unused
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*/
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int
priv_bitstream_size
;
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/**
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* unused
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*/
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int
priv_allocated_size
;
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/**
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* Use av_buffer to manage buffer.
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* When the flag is set, the CVPixelBuffers returned by the decoder will
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* be released automatically, so you have to retain them if necessary.
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* Not setting this flag may cause memory leak.
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*
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* encoding: unused
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* decoding: Set by user.
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*/
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int
use_ref_buffer
;
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};
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/** Create the video decoder. */
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int
ff_vda_create_decoder
(
struct
vda_context
*vda_ctx,
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uint8_t
*extradata,
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int
extradata_size);
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/** Destroy the video decoder. */
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int
ff_vda_destroy_decoder
(
struct
vda_context
*vda_ctx);
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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 VDA 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_vda_alloc_context() and freed with av_free().
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*/
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typedef
struct
AVVDAContext
{
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/**
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* VDA decoder object. Created and freed by the caller.
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*/
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VDADecoder
decoder
;
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/**
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* The output callback that must be passed to VDADecoderCreate.
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* Set by av_vda_alloc_context().
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*/
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VDADecoderOutputCallback
output_callback
;
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}
AVVDAContext
;
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/**
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* Allocate and initialize a VDA 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_VDA format. The caller must then create the decoder
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* object (using the output callback provided by libavcodec) that will be used
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* for VDA-accelerated decoding.
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*
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* When decoding with VDA is finished, the caller must destroy the decoder
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* object and free the VDA 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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AVVDAContext
*
av_vda_alloc_context
(
void
);
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/**
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* This is a convenience function that creates and sets up the VDA 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_vda_default_init
(
AVCodecContext
*avctx);
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/**
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* This function must be called to free the VDA context initialized with
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* av_vda_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_vda_default_free
(
AVCodecContext
*avctx);
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/**
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* @}
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*/
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#endif
/* AVCODEC_VDA_H */
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