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 "h264.h"
  33 #include "mpegvideo.h"
  34
  35 #ifndef kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
  36 #  define kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder CFSTR("EnableHardwareAcceleratedVideoDecoder")
  37 #endif
  38
  39 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
  40
  41 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
  42 {
  43     CVPixelBufferRef cv_buffer = (CVImageBufferRef)data;
  44     CVPixelBufferRelease(cv_buffer);
  45 }
  46
  47 static int videotoolbox_buffer_copy(VTContext *vtctx,
  48                                     const uint8_t *buffer,
  49                                     uint32_t size)
  50 {
  51     void *tmp;
  52
  53     tmp = av_fast_realloc(vtctx->bitstream,
  54                          &vtctx->allocated_size,
  55                          size);
  56
  57     if (!tmp)
  58         return AVERROR(ENOMEM);
  59
  60     vtctx->bitstream = tmp;
  61     memcpy(vtctx->bitstream, buffer, size);
  62     vtctx->bitstream_size = size;
  63
  64     return 0;
  65 }
  66
  67 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
  68 {
  69     frame->width  = avctx->width;
  70     frame->height = avctx->height;
  71     frame->format = avctx->pix_fmt;
  72     frame->buf[0] = av_buffer_alloc(1);
  73
  74     if (!frame->buf[0])
  75         return AVERROR(ENOMEM);
  76
  77     return 0;
  78 }
  79
  80 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
  81 {
  82     CFDataRef data = NULL;
  83
  84     /* Each VCL NAL in the bitstream sent to the decoder
  85      * is preceded by a 4 bytes length header.
  86      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
  87     if (avctx->extradata_size >= 4 && (avctx->extradata[4] & 0x03) != 0x03) {
  88         uint8_t *rw_extradata = av_memdup(avctx->extradata, avctx->extradata_size);
  89
  90         if (!rw_extradata)
  91             return NULL;
  92
  93         rw_extradata[4] |= 0x03;
  94
  95         data = CFDataCreate(kCFAllocatorDefault, rw_extradata, avctx->extradata_size);
  96
  97         av_freep(&rw_extradata);
  98     } else {
  99         data = CFDataCreate(kCFAllocatorDefault, avctx->extradata, avctx->extradata_size);
 100     }
 101
 102     return data;
 103 }
 104
 105 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
 106 {
 107     av_buffer_unref(&frame->buf[0]);
 108
 109     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
 110                                      sizeof(vtctx->frame),
 111                                      videotoolbox_buffer_release,
 112                                      NULL,
 113                                      AV_BUFFER_FLAG_READONLY);
 114     if (!frame->buf[0]) {
 115         return AVERROR(ENOMEM);
 116     }
 117
 118     frame->data[3] = (uint8_t*)vtctx->frame;
 119     vtctx->frame = NULL;
 120
 121     return 0;
 122 }
 123
 124 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
 125                                      const uint8_t *buffer,
 126                                      uint32_t size)
 127 {
 128     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 129     H264Context *h  = avctx->priv_data;
 130
 131     vtctx->bitstream_size = 0;
 132
 133     if (h->is_avc == 1) {
 134         return videotoolbox_buffer_copy(vtctx, buffer, size);
 135     }
 136
 137     return 0;
 138 }
 139
 140 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
 141                                       const uint8_t *buffer,
 142                                       uint32_t size)
 143 {
 144     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 145     H264Context *h  = avctx->priv_data;
 146     void *tmp;
 147
 148     if (h->is_avc == 1)
 149         return 0;
 150
 151     tmp = av_fast_realloc(vtctx->bitstream,
 152                           &vtctx->allocated_size,
 153                           vtctx->bitstream_size+size+4);
 154     if (!tmp)
 155         return AVERROR(ENOMEM);
 156
 157     vtctx->bitstream = tmp;
 158
 159     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
 160     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
 161
 162     vtctx->bitstream_size += size + 4;
 163
 164     return 0;
 165 }
 166
 167 int ff_videotoolbox_uninit(AVCodecContext *avctx)
 168 {
 169     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 170     if (vtctx) {
 171         av_freep(&vtctx->bitstream);
 172         if (vtctx->frame)
 173             CVPixelBufferRelease(vtctx->frame);
 174     }
 175
 176     return 0;
 177 }
 178
 179 #if CONFIG_VIDEOTOOLBOX
 180 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
 181 {
 182     int i;
 183     uint8_t b;
 184
 185     for (i = 3; i >= 0; i--) {
 186         b = (length >> (i * 7)) & 0x7F;
 187         if (i != 0)
 188             b |= 0x80;
 189
 190         bytestream2_put_byteu(pb, b);
 191     }
 192 }
 193
 194 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
 195 {
 196     CFDataRef data;
 197     uint8_t *rw_extradata;
 198     PutByteContext pb;
 199     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
 200     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
 201     int config_size = 13 + 5 + avctx->extradata_size;
 202     int s;
 203
 204     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
 205         return NULL;
 206
 207     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
 208     bytestream2_put_byteu(&pb, 0);        // version
 209     bytestream2_put_ne24(&pb, 0);         // flags
 210
 211     // elementary stream descriptor
 212     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
 213     videotoolbox_write_mp4_descr_length(&pb, full_size);
 214     bytestream2_put_ne16(&pb, 0);         // esid
 215     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
 216
 217     // decoder configuration descriptor
 218     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
 219     videotoolbox_write_mp4_descr_length(&pb, config_size);
 220     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
 221     bytestream2_put_byteu(&pb, 0x11);     // stream type
 222     bytestream2_put_ne24(&pb, 0);         // buffer size
 223     bytestream2_put_ne32(&pb, 0);         // max bitrate
 224     bytestream2_put_ne32(&pb, 0);         // avg bitrate
 225
 226     // decoder specific descriptor
 227     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
 228     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
 229
 230     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
 231
 232     // SLConfigDescriptor
 233     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
 234     bytestream2_put_byteu(&pb, 0x01);     // length
 235     bytestream2_put_byteu(&pb, 0x02);     //
 236
 237     s = bytestream2_size_p(&pb);
 238
 239     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
 240
 241     av_freep(&rw_extradata);
 242     return data;
 243 }
 244
 245 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
 246                                                            void *buffer,
 247                                                            int size)
 248 {
 249     OSStatus status;
 250     CMBlockBufferRef  block_buf;
 251     CMSampleBufferRef sample_buf;
 252
 253     block_buf  = NULL;
 254     sample_buf = NULL;
 255
 256     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
 257                                                 buffer,             // memoryBlock
 258                                                 size,               // blockLength
 259                                                 kCFAllocatorNull,   // blockAllocator
 260                                                 NULL,               // customBlockSource
 261                                                 0,                  // offsetToData
 262                                                 size,               // dataLength
 263                                                 0,                  // flags
 264                                                 &block_buf);
 265
 266     if (!status) {
 267         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
 268                                       block_buf,            // dataBuffer
 269                                       TRUE,                 // dataReady
 270                                       0,                    // makeDataReadyCallback
 271                                       0,                    // makeDataReadyRefcon
 272                                       fmt_desc,             // formatDescription
 273                                       1,                    // numSamples
 274                                       0,                    // numSampleTimingEntries
 275                                       NULL,                 // sampleTimingArray
 276                                       0,                    // numSampleSizeEntries
 277                                       NULL,                 // sampleSizeArray
 278                                       &sample_buf);
 279     }
 280
 281     if (block_buf)
 282         CFRelease(block_buf);
 283
 284     return sample_buf;
 285 }
 286
 287 static void videotoolbox_decoder_callback(void *opaque,
 288                                           void *sourceFrameRefCon,
 289                                           OSStatus status,
 290                                           VTDecodeInfoFlags flags,
 291                                           CVImageBufferRef image_buffer,
 292                                           CMTime pts,
 293                                           CMTime duration)
 294 {
 295     AVCodecContext *avctx = opaque;
 296     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 297
 298     if (vtctx->frame) {
 299         CVPixelBufferRelease(vtctx->frame);
 300         vtctx->frame = NULL;
 301     }
 302
 303     if (!image_buffer) {
 304         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
 305         return;
 306     }
 307
 308     vtctx->frame = CVPixelBufferRetain(image_buffer);
 309 }
 310
 311 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
 312 {
 313     OSStatus status;
 314     CMSampleBufferRef sample_buf;
 315     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 316     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 317
 318     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
 319                                                    vtctx->bitstream,
 320                                                    vtctx->bitstream_size);
 321
 322     if (!sample_buf)
 323         return -1;
 324
 325     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
 326                                                sample_buf,
 327                                                0,       // decodeFlags
 328                                                NULL,    // sourceFrameRefCon
 329                                                0);      // infoFlagsOut
 330     if (status == noErr)
 331         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
 332
 333     CFRelease(sample_buf);
 334
 335     return status;
 336 }
 337
 338 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
 339 {
 340     int status;
 341     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 342     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 343
 344     if (!videotoolbox->session || !vtctx->bitstream)
 345         return AVERROR_INVALIDDATA;
 346
 347     status = videotoolbox_session_decode_frame(avctx);
 348
 349     if (status) {
 350         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
 351         return AVERROR_UNKNOWN;
 352     }
 353
 354     if (!vtctx->frame)
 355         return AVERROR_UNKNOWN;
 356
 357     return ff_videotoolbox_buffer_create(vtctx, frame);
 358 }
 359
 360 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
 361 {
 362     H264Context *h = avctx->priv_data;
 363     AVFrame *frame = h->cur_pic_ptr->f;
 364
 365     return videotoolbox_common_end_frame(avctx, frame);
 366 }
 367
 368 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
 369                                          const uint8_t *buffer,
 370                                          uint32_t size)
 371 {
 372     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 373
 374     return videotoolbox_buffer_copy(vtctx, buffer, size);
 375 }
 376
 377 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
 378                                           const uint8_t *buffer,
 379                                           uint32_t size)
 380 {
 381     return 0;
 382 }
 383
 384 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
 385 {
 386     MpegEncContext *s = avctx->priv_data;
 387     AVFrame *frame = s->current_picture_ptr->f;
 388
 389     return videotoolbox_common_end_frame(avctx, frame);
 390 }
 391
 392 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
 393                                                           AVCodecContext *avctx)
 394 {
 395     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 396                                                                    1,
 397                                                                    &kCFTypeDictionaryKeyCallBacks,
 398                                                                    &kCFTypeDictionaryValueCallBacks);
 399
 400     CFDictionarySetValue(config_info,
 401                          kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder,
 402                          kCFBooleanTrue);
 403
 404     if (avctx->extradata_size) {
 405         CFMutableDictionaryRef avc_info;
 406         CFDataRef data = NULL;
 407
 408         avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 409                                              1,
 410                                              &kCFTypeDictionaryKeyCallBacks,
 411                                              &kCFTypeDictionaryValueCallBacks);
 412
 413         switch (codec_type) {
 414         case kCMVideoCodecType_MPEG4Video :
 415             data = videotoolbox_esds_extradata_create(avctx);
 416             if (data)
 417                 CFDictionarySetValue(avc_info, CFSTR("esds"), data);
 418             break;
 419         case kCMVideoCodecType_H264 :
 420             data = ff_videotoolbox_avcc_extradata_create(avctx);
 421             if (data)
 422                 CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
 423             break;
 424         default:
 425             break;
 426         }
 427
 428         CFDictionarySetValue(config_info,
 429                 kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
 430                 avc_info);
 431
 432         if (data)
 433             CFRelease(data);
 434
 435         CFRelease(avc_info);
 436     }
 437     return config_info;
 438 }
 439
 440 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
 441                                                              int height,
 442                                                              OSType pix_fmt)
 443 {
 444     CFMutableDictionaryRef buffer_attributes;
 445     CFMutableDictionaryRef io_surface_properties;
 446     CFNumberRef cv_pix_fmt;
 447     CFNumberRef w;
 448     CFNumberRef h;
 449
 450     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
 451     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
 452     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
 453
 454     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 455                                                   4,
 456                                                   &kCFTypeDictionaryKeyCallBacks,
 457                                                   &kCFTypeDictionaryValueCallBacks);
 458     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 459                                                       0,
 460                                                       &kCFTypeDictionaryKeyCallBacks,
 461                                                       &kCFTypeDictionaryValueCallBacks);
 462
 463     CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
 464     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
 465     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
 466     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
 467
 468     CFRelease(io_surface_properties);
 469     CFRelease(cv_pix_fmt);
 470     CFRelease(w);
 471     CFRelease(h);
 472
 473     return buffer_attributes;
 474 }
 475
 476 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
 477                                                                    CFDictionaryRef decoder_spec,
 478                                                                    int width,
 479                                                                    int height)
 480 {
 481     CMFormatDescriptionRef cm_fmt_desc;
 482     OSStatus status;
 483
 484     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 485                                             codec_type,
 486                                             width,
 487                                             height,
 488                                             decoder_spec, // Dictionary of extension
 489                                             &cm_fmt_desc);
 490
 491     if (status)
 492         return NULL;
 493
 494     return cm_fmt_desc;
 495 }
 496
 497 static int videotoolbox_default_init(AVCodecContext *avctx)
 498 {
 499     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 500     OSStatus status;
 501     VTDecompressionOutputCallbackRecord decoder_cb;
 502     CFDictionaryRef decoder_spec;
 503     CFDictionaryRef buf_attr;
 504
 505     if (!videotoolbox) {
 506         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 507         return -1;
 508     }
 509
 510     switch( avctx->codec_id ) {
 511     case AV_CODEC_ID_H263 :
 512         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 513         break;
 514     case AV_CODEC_ID_H264 :
 515         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 516         break;
 517     case AV_CODEC_ID_MPEG1VIDEO :
 518         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 519         break;
 520     case AV_CODEC_ID_MPEG2VIDEO :
 521         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 522         break;
 523     case AV_CODEC_ID_MPEG4 :
 524         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 525         break;
 526     default :
 527         break;
 528     }
 529
 530     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 531
 532     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
 533                                                                 decoder_spec,
 534                                                                 avctx->width,
 535                                                                 avctx->height);
 536     if (!videotoolbox->cm_fmt_desc) {
 537         if (decoder_spec)
 538             CFRelease(decoder_spec);
 539
 540         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 541         return -1;
 542     }
 543
 544     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 545                                                      avctx->height,
 546                                                      videotoolbox->cv_pix_fmt_type);
 547
 548     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 549     decoder_cb.decompressionOutputRefCon   = avctx;
 550
 551     status = VTDecompressionSessionCreate(NULL,                      // allocator
 552                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 553                                           decoder_spec,              // videoDecoderSpecification
 554                                           buf_attr,                  // destinationImageBufferAttributes
 555                                           &decoder_cb,               // outputCallback
 556                                           &videotoolbox->session);   // decompressionSessionOut
 557
 558     if (decoder_spec)
 559         CFRelease(decoder_spec);
 560     if (buf_attr)
 561         CFRelease(buf_attr);
 562
 563     switch (status) {
 564     case kVTVideoDecoderNotAvailableNowErr:
 565     case kVTVideoDecoderUnsupportedDataFormatErr:
 566         return AVERROR(ENOSYS);
 567     case kVTVideoDecoderMalfunctionErr:
 568         return AVERROR(EINVAL);
 569     case kVTVideoDecoderBadDataErr :
 570         return AVERROR_INVALIDDATA;
 571     case 0:
 572         return 0;
 573     default:
 574         return AVERROR_UNKNOWN;
 575     }
 576 }
 577
 578 static void videotoolbox_default_free(AVCodecContext *avctx)
 579 {
 580     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 581
 582     if (videotoolbox) {
 583         if (videotoolbox->cm_fmt_desc)
 584             CFRelease(videotoolbox->cm_fmt_desc);
 585
 586         if (videotoolbox->session)
 587             VTDecompressionSessionInvalidate(videotoolbox->session);
 588     }
 589 }
 590
 591 AVHWAccel ff_h263_videotoolbox_hwaccel = {
 592     .name           = "h263_videotoolbox",
 593     .type           = AVMEDIA_TYPE_VIDEO,
 594     .id             = AV_CODEC_ID_H263,
 595     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 596     .alloc_frame    = ff_videotoolbox_alloc_frame,
 597     .start_frame    = videotoolbox_mpeg_start_frame,
 598     .decode_slice   = videotoolbox_mpeg_decode_slice,
 599     .end_frame      = videotoolbox_mpeg_end_frame,
 600     .uninit         = ff_videotoolbox_uninit,
 601     .priv_data_size = sizeof(VTContext),
 602 };
 603
 604 AVHWAccel ff_h264_videotoolbox_hwaccel = {
 605     .name           = "h264_videotoolbox",
 606     .type           = AVMEDIA_TYPE_VIDEO,
 607     .id             = AV_CODEC_ID_H264,
 608     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 609     .alloc_frame    = ff_videotoolbox_alloc_frame,
 610     .start_frame    = ff_videotoolbox_h264_start_frame,
 611     .decode_slice   = ff_videotoolbox_h264_decode_slice,
 612     .end_frame      = videotoolbox_h264_end_frame,
 613     .uninit         = ff_videotoolbox_uninit,
 614     .priv_data_size = sizeof(VTContext),
 615 };
 616
 617 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
 618     .name           = "mpeg1_videotoolbox",
 619     .type           = AVMEDIA_TYPE_VIDEO,
 620     .id             = AV_CODEC_ID_MPEG1VIDEO,
 621     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 622     .alloc_frame    = ff_videotoolbox_alloc_frame,
 623     .start_frame    = videotoolbox_mpeg_start_frame,
 624     .decode_slice   = videotoolbox_mpeg_decode_slice,
 625     .end_frame      = videotoolbox_mpeg_end_frame,
 626     .uninit         = ff_videotoolbox_uninit,
 627     .priv_data_size = sizeof(VTContext),
 628 };
 629
 630 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
 631     .name           = "mpeg2_videotoolbox",
 632     .type           = AVMEDIA_TYPE_VIDEO,
 633     .id             = AV_CODEC_ID_MPEG2VIDEO,
 634     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 635     .alloc_frame    = ff_videotoolbox_alloc_frame,
 636     .start_frame    = videotoolbox_mpeg_start_frame,
 637     .decode_slice   = videotoolbox_mpeg_decode_slice,
 638     .end_frame      = videotoolbox_mpeg_end_frame,
 639     .uninit         = ff_videotoolbox_uninit,
 640     .priv_data_size = sizeof(VTContext),
 641 };
 642
 643 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
 644     .name           = "mpeg4_videotoolbox",
 645     .type           = AVMEDIA_TYPE_VIDEO,
 646     .id             = AV_CODEC_ID_MPEG4,
 647     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 648     .alloc_frame    = ff_videotoolbox_alloc_frame,
 649     .start_frame    = videotoolbox_mpeg_start_frame,
 650     .decode_slice   = videotoolbox_mpeg_decode_slice,
 651     .end_frame      = videotoolbox_mpeg_end_frame,
 652     .uninit         = ff_videotoolbox_uninit,
 653     .priv_data_size = sizeof(VTContext),
 654 };
 655
 656 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
 657 {
 658     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
 659
 660     if (ret) {
 661         ret->output_callback = videotoolbox_decoder_callback;
 662         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
 663     }
 664
 665     return ret;
 666 }
 667
 668 int av_videotoolbox_default_init(AVCodecContext *avctx)
 669 {
 670     return av_videotoolbox_default_init2(avctx, NULL);
 671 }
 672
 673 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
 674 {
 675     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
 676     if (!avctx->hwaccel_context)
 677         return AVERROR(ENOMEM);
 678     return videotoolbox_default_init(avctx);
 679 }
 680
 681 void av_videotoolbox_default_free(AVCodecContext *avctx)
 682 {
 683
 684     videotoolbox_default_free(avctx);
 685     av_freep(&avctx->hwaccel_context);
 686 }
 687 #endif /* CONFIG_VIDEOTOOLBOX */