git.sesse.net Git - ffmpeg/blob - libavcodec/videotoolbox.c

   1 /*
   2  * Videotoolbox hardware acceleration
   3  *
   4  * copyright (c) 2012 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 #include "config.h"
  24 #if CONFIG_VIDEOTOOLBOX
  25 #  include "videotoolbox.h"
  26 #else
  27 #  include "vda.h"
  28 #endif
  29 #include "vda_vt_internal.h"
  30 #include "libavutil/avutil.h"
  31 #include "bytestream.h"
  32 #include "h264dec.h"
  33 #include "mpegvideo.h"
  34 #include <TargetConditionals.h>
  35
  36 #ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
  37 #  define kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder CFSTR("RequireHardwareAcceleratedVideoDecoder")
  38 #endif
  39
  40 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
  41
  42 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
  43 {
  44     CVPixelBufferRef cv_buffer = (CVImageBufferRef)data;
  45     CVPixelBufferRelease(cv_buffer);
  46 }
  47
  48 static int videotoolbox_buffer_copy(VTContext *vtctx,
  49                                     const uint8_t *buffer,
  50                                     uint32_t size)
  51 {
  52     void *tmp;
  53
  54     tmp = av_fast_realloc(vtctx->bitstream,
  55                          &vtctx->allocated_size,
  56                          size);
  57
  58     if (!tmp)
  59         return AVERROR(ENOMEM);
  60
  61     vtctx->bitstream = tmp;
  62     memcpy(vtctx->bitstream, buffer, size);
  63     vtctx->bitstream_size = size;
  64
  65     return 0;
  66 }
  67
  68 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
  69 {
  70     frame->width  = avctx->width;
  71     frame->height = avctx->height;
  72     frame->format = avctx->pix_fmt;
  73     frame->buf[0] = av_buffer_alloc(1);
  74
  75     if (!frame->buf[0])
  76         return AVERROR(ENOMEM);
  77
  78     return 0;
  79 }
  80
  81 #define AV_W8(p, v) *(p) = (v)
  82
  83 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
  84 {
  85     H264Context *h     = avctx->priv_data;
  86     CFDataRef data = NULL;
  87     uint8_t *p;
  88     int vt_extradata_size = 6 + 2 + h->ps.sps->data_size + 3 + h->ps.pps->data_size;
  89     uint8_t *vt_extradata = av_malloc(vt_extradata_size);
  90     if (!vt_extradata)
  91         return NULL;
  92
  93     p = vt_extradata;
  94
  95     AV_W8(p + 0, 1); /* version */
  96     AV_W8(p + 1, h->ps.sps->data[1]); /* profile */
  97     AV_W8(p + 2, h->ps.sps->data[2]); /* profile compat */
  98     AV_W8(p + 3, h->ps.sps->data[3]); /* level */
  99     AV_W8(p + 4, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 3 (11) */
 100     AV_W8(p + 5, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
 101     AV_WB16(p + 6, h->ps.sps->data_size);
 102     memcpy(p + 8, h->ps.sps->data, h->ps.sps->data_size);
 103     p += 8 + h->ps.sps->data_size;
 104     AV_W8(p + 0, 1); /* number of pps */
 105     AV_WB16(p + 1, h->ps.pps->data_size);
 106     memcpy(p + 3, h->ps.pps->data, h->ps.pps->data_size);
 107
 108     p += 3 + h->ps.pps->data_size;
 109     av_assert0(p - vt_extradata == vt_extradata_size);
 110
 111     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 112     av_free(vt_extradata);
 113     return data;
 114 }
 115
 116 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
 117 {
 118     av_buffer_unref(&frame->buf[0]);
 119
 120     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
 121                                      sizeof(vtctx->frame),
 122                                      videotoolbox_buffer_release,
 123                                      NULL,
 124                                      AV_BUFFER_FLAG_READONLY);
 125     if (!frame->buf[0]) {
 126         return AVERROR(ENOMEM);
 127     }
 128
 129     frame->data[3] = (uint8_t*)vtctx->frame;
 130     vtctx->frame = NULL;
 131
 132     return 0;
 133 }
 134
 135 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
 136                                      const uint8_t *buffer,
 137                                      uint32_t size)
 138 {
 139     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 140     H264Context *h  = avctx->priv_data;
 141
 142     vtctx->bitstream_size = 0;
 143
 144     if (h->is_avc == 1) {
 145         return videotoolbox_buffer_copy(vtctx, buffer, size);
 146     }
 147
 148     return 0;
 149 }
 150
 151 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
 152                                       const uint8_t *buffer,
 153                                       uint32_t size)
 154 {
 155     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 156     H264Context *h  = avctx->priv_data;
 157     void *tmp;
 158
 159     if (h->is_avc == 1)
 160         return 0;
 161
 162     tmp = av_fast_realloc(vtctx->bitstream,
 163                           &vtctx->allocated_size,
 164                           vtctx->bitstream_size+size+4);
 165     if (!tmp)
 166         return AVERROR(ENOMEM);
 167
 168     vtctx->bitstream = tmp;
 169
 170     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
 171     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
 172
 173     vtctx->bitstream_size += size + 4;
 174
 175     return 0;
 176 }
 177
 178 int ff_videotoolbox_uninit(AVCodecContext *avctx)
 179 {
 180     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 181     if (vtctx) {
 182         av_freep(&vtctx->bitstream);
 183         if (vtctx->frame)
 184             CVPixelBufferRelease(vtctx->frame);
 185     }
 186
 187     return 0;
 188 }
 189
 190 #if CONFIG_VIDEOTOOLBOX
 191 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
 192 {
 193     int i;
 194     uint8_t b;
 195
 196     for (i = 3; i >= 0; i--) {
 197         b = (length >> (i * 7)) & 0x7F;
 198         if (i != 0)
 199             b |= 0x80;
 200
 201         bytestream2_put_byteu(pb, b);
 202     }
 203 }
 204
 205 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
 206 {
 207     CFDataRef data;
 208     uint8_t *rw_extradata;
 209     PutByteContext pb;
 210     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
 211     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
 212     int config_size = 13 + 5 + avctx->extradata_size;
 213     int s;
 214
 215     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
 216         return NULL;
 217
 218     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
 219     bytestream2_put_byteu(&pb, 0);        // version
 220     bytestream2_put_ne24(&pb, 0);         // flags
 221
 222     // elementary stream descriptor
 223     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
 224     videotoolbox_write_mp4_descr_length(&pb, full_size);
 225     bytestream2_put_ne16(&pb, 0);         // esid
 226     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
 227
 228     // decoder configuration descriptor
 229     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
 230     videotoolbox_write_mp4_descr_length(&pb, config_size);
 231     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
 232     bytestream2_put_byteu(&pb, 0x11);     // stream type
 233     bytestream2_put_ne24(&pb, 0);         // buffer size
 234     bytestream2_put_ne32(&pb, 0);         // max bitrate
 235     bytestream2_put_ne32(&pb, 0);         // avg bitrate
 236
 237     // decoder specific descriptor
 238     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
 239     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
 240
 241     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
 242
 243     // SLConfigDescriptor
 244     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
 245     bytestream2_put_byteu(&pb, 0x01);     // length
 246     bytestream2_put_byteu(&pb, 0x02);     //
 247
 248     s = bytestream2_size_p(&pb);
 249
 250     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
 251
 252     av_freep(&rw_extradata);
 253     return data;
 254 }
 255
 256 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
 257                                                            void *buffer,
 258                                                            int size)
 259 {
 260     OSStatus status;
 261     CMBlockBufferRef  block_buf;
 262     CMSampleBufferRef sample_buf;
 263
 264     block_buf  = NULL;
 265     sample_buf = NULL;
 266
 267     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
 268                                                 buffer,             // memoryBlock
 269                                                 size,               // blockLength
 270                                                 kCFAllocatorNull,   // blockAllocator
 271                                                 NULL,               // customBlockSource
 272                                                 0,                  // offsetToData
 273                                                 size,               // dataLength
 274                                                 0,                  // flags
 275                                                 &block_buf);
 276
 277     if (!status) {
 278         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
 279                                       block_buf,            // dataBuffer
 280                                       TRUE,                 // dataReady
 281                                       0,                    // makeDataReadyCallback
 282                                       0,                    // makeDataReadyRefcon
 283                                       fmt_desc,             // formatDescription
 284                                       1,                    // numSamples
 285                                       0,                    // numSampleTimingEntries
 286                                       NULL,                 // sampleTimingArray
 287                                       0,                    // numSampleSizeEntries
 288                                       NULL,                 // sampleSizeArray
 289                                       &sample_buf);
 290     }
 291
 292     if (block_buf)
 293         CFRelease(block_buf);
 294
 295     return sample_buf;
 296 }
 297
 298 static void videotoolbox_decoder_callback(void *opaque,
 299                                           void *sourceFrameRefCon,
 300                                           OSStatus status,
 301                                           VTDecodeInfoFlags flags,
 302                                           CVImageBufferRef image_buffer,
 303                                           CMTime pts,
 304                                           CMTime duration)
 305 {
 306     AVCodecContext *avctx = opaque;
 307     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 308
 309     if (vtctx->frame) {
 310         CVPixelBufferRelease(vtctx->frame);
 311         vtctx->frame = NULL;
 312     }
 313
 314     if (!image_buffer) {
 315         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
 316         return;
 317     }
 318
 319     vtctx->frame = CVPixelBufferRetain(image_buffer);
 320 }
 321
 322 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
 323 {
 324     OSStatus status;
 325     CMSampleBufferRef sample_buf;
 326     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 327     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 328
 329     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
 330                                                    vtctx->bitstream,
 331                                                    vtctx->bitstream_size);
 332
 333     if (!sample_buf)
 334         return -1;
 335
 336     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
 337                                                sample_buf,
 338                                                0,       // decodeFlags
 339                                                NULL,    // sourceFrameRefCon
 340                                                0);      // infoFlagsOut
 341     if (status == noErr)
 342         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
 343
 344     CFRelease(sample_buf);
 345
 346     return status;
 347 }
 348
 349 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
 350 {
 351     int status;
 352     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 353     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 354
 355     if (!videotoolbox->session || !vtctx->bitstream)
 356         return AVERROR_INVALIDDATA;
 357
 358     status = videotoolbox_session_decode_frame(avctx);
 359
 360     if (status) {
 361         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
 362         return AVERROR_UNKNOWN;
 363     }
 364
 365     if (!vtctx->frame)
 366         return AVERROR_UNKNOWN;
 367
 368     return ff_videotoolbox_buffer_create(vtctx, frame);
 369 }
 370
 371 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
 372 {
 373     H264Context *h = avctx->priv_data;
 374     AVFrame *frame = h->cur_pic_ptr->f;
 375
 376     return videotoolbox_common_end_frame(avctx, frame);
 377 }
 378
 379 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
 380                                          const uint8_t *buffer,
 381                                          uint32_t size)
 382 {
 383     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 384
 385     return videotoolbox_buffer_copy(vtctx, buffer, size);
 386 }
 387
 388 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
 389                                           const uint8_t *buffer,
 390                                           uint32_t size)
 391 {
 392     return 0;
 393 }
 394
 395 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
 396 {
 397     MpegEncContext *s = avctx->priv_data;
 398     AVFrame *frame = s->current_picture_ptr->f;
 399
 400     return videotoolbox_common_end_frame(avctx, frame);
 401 }
 402
 403 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
 404                                                           AVCodecContext *avctx)
 405 {
 406     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 407                                                                    0,
 408                                                                    &kCFTypeDictionaryKeyCallBacks,
 409                                                                    &kCFTypeDictionaryValueCallBacks);
 410
 411     CFDictionarySetValue(config_info,
 412                          kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
 413                          kCFBooleanTrue);
 414
 415     if (avctx->extradata_size) {
 416         CFMutableDictionaryRef avc_info;
 417         CFDataRef data = NULL;
 418
 419         avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 420                                              1,
 421                                              &kCFTypeDictionaryKeyCallBacks,
 422                                              &kCFTypeDictionaryValueCallBacks);
 423
 424         switch (codec_type) {
 425         case kCMVideoCodecType_MPEG4Video :
 426             data = videotoolbox_esds_extradata_create(avctx);
 427             if (data)
 428                 CFDictionarySetValue(avc_info, CFSTR("esds"), data);
 429             break;
 430         case kCMVideoCodecType_H264 :
 431             data = ff_videotoolbox_avcc_extradata_create(avctx);
 432             if (data)
 433                 CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
 434             break;
 435         default:
 436             break;
 437         }
 438
 439         CFDictionarySetValue(config_info,
 440                 kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
 441                 avc_info);
 442
 443         if (data)
 444             CFRelease(data);
 445
 446         CFRelease(avc_info);
 447     }
 448     return config_info;
 449 }
 450
 451 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
 452                                                              int height,
 453                                                              OSType pix_fmt)
 454 {
 455     CFMutableDictionaryRef buffer_attributes;
 456     CFMutableDictionaryRef io_surface_properties;
 457     CFNumberRef cv_pix_fmt;
 458     CFNumberRef w;
 459     CFNumberRef h;
 460
 461     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
 462     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
 463     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
 464
 465     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 466                                                   4,
 467                                                   &kCFTypeDictionaryKeyCallBacks,
 468                                                   &kCFTypeDictionaryValueCallBacks);
 469     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 470                                                       0,
 471                                                       &kCFTypeDictionaryKeyCallBacks,
 472                                                       &kCFTypeDictionaryValueCallBacks);
 473
 474     if (pix_fmt)
 475         CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
 476     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
 477     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
 478     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
 479 #if TARGET_OS_IPHONE
 480     CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
 481 #else
 482     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
 483 #endif
 484
 485     CFRelease(io_surface_properties);
 486     CFRelease(cv_pix_fmt);
 487     CFRelease(w);
 488     CFRelease(h);
 489
 490     return buffer_attributes;
 491 }
 492
 493 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
 494                                                                    CFDictionaryRef decoder_spec,
 495                                                                    int width,
 496                                                                    int height)
 497 {
 498     CMFormatDescriptionRef cm_fmt_desc;
 499     OSStatus status;
 500
 501     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 502                                             codec_type,
 503                                             width,
 504                                             height,
 505                                             decoder_spec, // Dictionary of extension
 506                                             &cm_fmt_desc);
 507
 508     if (status)
 509         return NULL;
 510
 511     return cm_fmt_desc;
 512 }
 513
 514 static int videotoolbox_default_init(AVCodecContext *avctx)
 515 {
 516     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 517     OSStatus status;
 518     VTDecompressionOutputCallbackRecord decoder_cb;
 519     CFDictionaryRef decoder_spec;
 520     CFDictionaryRef buf_attr;
 521
 522     if (!videotoolbox) {
 523         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 524         return -1;
 525     }
 526
 527     switch( avctx->codec_id ) {
 528     case AV_CODEC_ID_H263 :
 529         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 530         break;
 531     case AV_CODEC_ID_H264 :
 532         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 533         break;
 534     case AV_CODEC_ID_MPEG1VIDEO :
 535         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 536         break;
 537     case AV_CODEC_ID_MPEG2VIDEO :
 538         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 539         break;
 540     case AV_CODEC_ID_MPEG4 :
 541         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 542         break;
 543     default :
 544         break;
 545     }
 546
 547     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 548
 549     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
 550                                                                 decoder_spec,
 551                                                                 avctx->width,
 552                                                                 avctx->height);
 553     if (!videotoolbox->cm_fmt_desc) {
 554         if (decoder_spec)
 555             CFRelease(decoder_spec);
 556
 557         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 558         return -1;
 559     }
 560
 561     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 562                                                      avctx->height,
 563                                                      videotoolbox->cv_pix_fmt_type);
 564
 565     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 566     decoder_cb.decompressionOutputRefCon   = avctx;
 567
 568     status = VTDecompressionSessionCreate(NULL,                      // allocator
 569                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 570                                           decoder_spec,              // videoDecoderSpecification
 571                                           buf_attr,                  // destinationImageBufferAttributes
 572                                           &decoder_cb,               // outputCallback
 573                                           &videotoolbox->session);   // decompressionSessionOut
 574
 575     if (decoder_spec)
 576         CFRelease(decoder_spec);
 577     if (buf_attr)
 578         CFRelease(buf_attr);
 579
 580     switch (status) {
 581     case kVTVideoDecoderNotAvailableNowErr:
 582     case kVTVideoDecoderUnsupportedDataFormatErr:
 583         return AVERROR(ENOSYS);
 584     case kVTVideoDecoderMalfunctionErr:
 585         return AVERROR(EINVAL);
 586     case kVTVideoDecoderBadDataErr :
 587         return AVERROR_INVALIDDATA;
 588     case 0:
 589         return 0;
 590     default:
 591         return AVERROR_UNKNOWN;
 592     }
 593 }
 594
 595 static void videotoolbox_default_free(AVCodecContext *avctx)
 596 {
 597     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 598
 599     if (videotoolbox) {
 600         if (videotoolbox->cm_fmt_desc)
 601             CFRelease(videotoolbox->cm_fmt_desc);
 602
 603         if (videotoolbox->session) {
 604             VTDecompressionSessionInvalidate(videotoolbox->session);
 605             CFRelease(videotoolbox->session);
 606         }
 607     }
 608 }
 609
 610 AVHWAccel ff_h263_videotoolbox_hwaccel = {
 611     .name           = "h263_videotoolbox",
 612     .type           = AVMEDIA_TYPE_VIDEO,
 613     .id             = AV_CODEC_ID_H263,
 614     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 615     .alloc_frame    = ff_videotoolbox_alloc_frame,
 616     .start_frame    = videotoolbox_mpeg_start_frame,
 617     .decode_slice   = videotoolbox_mpeg_decode_slice,
 618     .end_frame      = videotoolbox_mpeg_end_frame,
 619     .uninit         = ff_videotoolbox_uninit,
 620     .priv_data_size = sizeof(VTContext),
 621 };
 622
 623 AVHWAccel ff_h264_videotoolbox_hwaccel = {
 624     .name           = "h264_videotoolbox",
 625     .type           = AVMEDIA_TYPE_VIDEO,
 626     .id             = AV_CODEC_ID_H264,
 627     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 628     .alloc_frame    = ff_videotoolbox_alloc_frame,
 629     .start_frame    = ff_videotoolbox_h264_start_frame,
 630     .decode_slice   = ff_videotoolbox_h264_decode_slice,
 631     .end_frame      = videotoolbox_h264_end_frame,
 632     .uninit         = ff_videotoolbox_uninit,
 633     .priv_data_size = sizeof(VTContext),
 634 };
 635
 636 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
 637     .name           = "mpeg1_videotoolbox",
 638     .type           = AVMEDIA_TYPE_VIDEO,
 639     .id             = AV_CODEC_ID_MPEG1VIDEO,
 640     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 641     .alloc_frame    = ff_videotoolbox_alloc_frame,
 642     .start_frame    = videotoolbox_mpeg_start_frame,
 643     .decode_slice   = videotoolbox_mpeg_decode_slice,
 644     .end_frame      = videotoolbox_mpeg_end_frame,
 645     .uninit         = ff_videotoolbox_uninit,
 646     .priv_data_size = sizeof(VTContext),
 647 };
 648
 649 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
 650     .name           = "mpeg2_videotoolbox",
 651     .type           = AVMEDIA_TYPE_VIDEO,
 652     .id             = AV_CODEC_ID_MPEG2VIDEO,
 653     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 654     .alloc_frame    = ff_videotoolbox_alloc_frame,
 655     .start_frame    = videotoolbox_mpeg_start_frame,
 656     .decode_slice   = videotoolbox_mpeg_decode_slice,
 657     .end_frame      = videotoolbox_mpeg_end_frame,
 658     .uninit         = ff_videotoolbox_uninit,
 659     .priv_data_size = sizeof(VTContext),
 660 };
 661
 662 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
 663     .name           = "mpeg4_videotoolbox",
 664     .type           = AVMEDIA_TYPE_VIDEO,
 665     .id             = AV_CODEC_ID_MPEG4,
 666     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 667     .alloc_frame    = ff_videotoolbox_alloc_frame,
 668     .start_frame    = videotoolbox_mpeg_start_frame,
 669     .decode_slice   = videotoolbox_mpeg_decode_slice,
 670     .end_frame      = videotoolbox_mpeg_end_frame,
 671     .uninit         = ff_videotoolbox_uninit,
 672     .priv_data_size = sizeof(VTContext),
 673 };
 674
 675 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
 676 {
 677     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
 678
 679     if (ret) {
 680         ret->output_callback = videotoolbox_decoder_callback;
 681         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
 682     }
 683
 684     return ret;
 685 }
 686
 687 int av_videotoolbox_default_init(AVCodecContext *avctx)
 688 {
 689     return av_videotoolbox_default_init2(avctx, NULL);
 690 }
 691
 692 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
 693 {
 694     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
 695     if (!avctx->hwaccel_context)
 696         return AVERROR(ENOMEM);
 697     return videotoolbox_default_init(avctx);
 698 }
 699
 700 void av_videotoolbox_default_free(AVCodecContext *avctx)
 701 {
 702
 703     videotoolbox_default_free(avctx);
 704     av_freep(&avctx->hwaccel_context);
 705 }
 706 #endif /* CONFIG_VIDEOTOOLBOX */