ffmpeg/libavcodec/vda.h

   1 /*
   2  * VDA HW acceleration
   3  *
   4  * copyright (c) 2011 Sebastien Zwickert
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef AVCODEC_VDA_H
  24 #define AVCODEC_VDA_H
  25
  26 /**
  27  * @file
  28  * @ingroup lavc_codec_hwaccel_vda
  29  * Public libavcodec VDA header.
  30  */
  31
  32 #include "libavcodec/avcodec.h"
  33
  34 #include <stdint.h>
  35
  36 // emmintrin.h is unable to compile with -std=c99 -Werror=missing-prototypes
  37 // http://openradar.appspot.com/8026390
  38 #undef __GNUC_STDC_INLINE__
  39
  40 #define Picture QuickdrawPicture
  41 #include <VideoDecodeAcceleration/VDADecoder.h>
  42 #undef Picture
  43
  44 #include "libavcodec/version.h"
  45
  46 // extra flags not defined in VDADecoder.h
  47 enum {
  48     kVDADecodeInfo_Asynchronous = 1UL << 0,
  49     kVDADecodeInfo_FrameDropped = 1UL << 1
  50 };
  51
  52 /**
  53  * @defgroup lavc_codec_hwaccel_vda VDA
  54  * @ingroup lavc_codec_hwaccel
  55  *
  56  * @{
  57  */
  58
  59 /**
  60  * This structure is used to provide the necessary configurations and data
  61  * to the VDA FFmpeg HWAccel implementation.
  62  *
  63  * The application must make it available as AVCodecContext.hwaccel_context.
  64  */
  65 struct vda_context {
  66     /**
  67      * VDA decoder object.
  68      *
  69      * - encoding: unused
  70      * - decoding: Set/Unset by libavcodec.
  71      */
  72     VDADecoder          decoder;
  73
  74     /**
  75      * The Core Video pixel buffer that contains the current image data.
  76      *
  77      * encoding: unused
  78      * decoding: Set by libavcodec. Unset by user.
  79      */
  80     CVPixelBufferRef    cv_buffer;
  81
  82     /**
  83      * Use the hardware decoder in synchronous mode.
  84      *
  85      * encoding: unused
  86      * decoding: Set by user.
  87      */
  88     int                 use_sync_decoding;
  89
  90     /**
  91      * The frame width.
  92      *
  93      * - encoding: unused
  94      * - decoding: Set/Unset by user.
  95      */
  96     int                 width;
  97
  98     /**
  99      * The frame height.
 100      *
 101      * - encoding: unused
 102      * - decoding: Set/Unset by user.
 103      */
 104     int                 height;
 105
 106     /**
 107      * The frame format.
 108      *
 109      * - encoding: unused
 110      * - decoding: Set/Unset by user.
 111      */
 112     int                 format;
 113
 114     /**
 115      * The pixel format for output image buffers.
 116      *
 117      * - encoding: unused
 118      * - decoding: Set/Unset by user.
 119      */
 120     OSType              cv_pix_fmt_type;
 121
 122     /**
 123      * unused
 124      */
 125     uint8_t             *priv_bitstream;
 126
 127     /**
 128      * unused
 129      */
 130     int                 priv_bitstream_size;
 131
 132     /**
 133      * unused
 134      */
 135     int                 priv_allocated_size;
 136
 137     /**
 138      * Use av_buffer to manage buffer.
 139      * When the flag is set, the CVPixelBuffers returned by the decoder will
 140      * be released automatically, so you have to retain them if necessary.
 141      * Not setting this flag may cause memory leak.
 142      *
 143      * encoding: unused
 144      * decoding: Set by user.
 145      */
 146     int                 use_ref_buffer;
 147 };
 148
 149 /** Create the video decoder. */
 150 int ff_vda_create_decoder(struct vda_context *vda_ctx,
 151                           uint8_t *extradata,
 152                           int extradata_size);
 153
 154 /** Destroy the video decoder. */
 155 int ff_vda_destroy_decoder(struct vda_context *vda_ctx);
 156
 157 /**
 158  * This struct holds all the information that needs to be passed
 159  * between the caller and libavcodec for initializing VDA decoding.
 160  * Its size is not a part of the public ABI, it must be allocated with
 161  * av_vda_alloc_context() and freed with av_free().
 162  */
 163 typedef struct AVVDAContext {
 164     /**
 165      * VDA decoder object. Created and freed by the caller.
 166      */
 167     VDADecoder decoder;
 168
 169     /**
 170      * The output callback that must be passed to VDADecoderCreate.
 171      * Set by av_vda_alloc_context().
 172      */
 173     VDADecoderOutputCallback output_callback;
 174 } AVVDAContext;
 175
 176 /**
 177  * Allocate and initialize a VDA context.
 178  *
 179  * This function should be called from the get_format() callback when the caller
 180  * selects the AV_PIX_FMT_VDA format. The caller must then create the decoder
 181  * object (using the output callback provided by libavcodec) that will be used
 182  * for VDA-accelerated decoding.
 183  *
 184  * When decoding with VDA is finished, the caller must destroy the decoder
 185  * object and free the VDA context using av_free().
 186  *
 187  * @return the newly allocated context or NULL on failure
 188  */
 189 AVVDAContext *av_vda_alloc_context(void);
 190
 191 /**
 192  * This is a convenience function that creates and sets up the VDA context using
 193  * an internal implementation.
 194  *
 195  * @param avctx the corresponding codec context
 196  *
 197  * @return >= 0 on success, a negative AVERROR code on failure
 198  */
 199 int av_vda_default_init(AVCodecContext *avctx);
 200
 201 /**
 202  * This function must be called to free the VDA context initialized with
 203  * av_vda_default_init().
 204  *
 205  * @param avctx the corresponding codec context
 206  */
 207 void av_vda_default_free(AVCodecContext *avctx);
 208
 209 /**
 210  * @}
 211  */
 212
 213 #endif /* AVCODEC_VDA_H */