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