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_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 + 3 + h->sps.data_size + 4 + h->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->sps.data[0]); /* profile */
  96     AV_W8(p + 2, h->sps.data[1]); /* profile compat */
  97     AV_W8(p + 3, h->sps.data[2]); /* 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->sps.data_size + 1);
 101     AV_W8(p + 8, NAL_SPS | (3 << 5)); // NAL unit header
 102     memcpy(p + 9, h->sps.data, h->sps.data_size);
 103     p += 9 + h->sps.data_size;
 104     AV_W8(p + 0, 1); /* number of pps */
 105     AV_WB16(p + 1, h->pps.data_size + 1);
 106     AV_W8(p + 3, NAL_PPS | (3 << 5)); // NAL unit header
 107     memcpy(p + 4, h->pps.data, h->pps.data_size);
 108
 109     p += 4 + h->pps.data_size;
 110     av_assert0(p - vt_extradata == vt_extradata_size);
 111
 112     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 113     av_free(vt_extradata);
 114     return data;
 115 }
 116
 117 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
 118 {
 119     av_buffer_unref(&frame->buf[0]);
 120
 121     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
 122                                      sizeof(vtctx->frame),
 123                                      videotoolbox_buffer_release,
 124                                      NULL,
 125                                      AV_BUFFER_FLAG_READONLY);
 126     if (!frame->buf[0]) {
 127         return AVERROR(ENOMEM);
 128     }
 129
 130     frame->data[3] = (uint8_t*)vtctx->frame;
 131     vtctx->frame = NULL;
 132
 133     return 0;
 134 }
 135
 136 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
 137                                      const uint8_t *buffer,
 138                                      uint32_t size)
 139 {
 140     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 141     H264Context *h  = avctx->priv_data;
 142
 143     vtctx->bitstream_size = 0;
 144
 145     if (h->is_avc == 1) {
 146         return videotoolbox_buffer_copy(vtctx, buffer, size);
 147     }
 148
 149     return 0;
 150 }
 151
 152 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
 153                                       const uint8_t *buffer,
 154                                       uint32_t size)
 155 {
 156     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 157     H264Context *h  = avctx->priv_data;
 158     void *tmp;
 159
 160     if (h->is_avc == 1)
 161         return 0;
 162
 163     tmp = av_fast_realloc(vtctx->bitstream,
 164                           &vtctx->allocated_size,
 165                           vtctx->bitstream_size+size+4);
 166     if (!tmp)
 167         return AVERROR(ENOMEM);
 168
 169     vtctx->bitstream = tmp;
 170
 171     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
 172     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
 173
 174     vtctx->bitstream_size += size + 4;
 175
 176     return 0;
 177 }
 178
 179 int ff_videotoolbox_uninit(AVCodecContext *avctx)
 180 {
 181     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 182     if (vtctx) {
 183         av_freep(&vtctx->bitstream);
 184         if (vtctx->frame)
 185             CVPixelBufferRelease(vtctx->frame);
 186     }
 187
 188     return 0;
 189 }
 190
 191 #if CONFIG_VIDEOTOOLBOX
 192 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
 193 {
 194     int i;
 195     uint8_t b;
 196
 197     for (i = 3; i >= 0; i--) {
 198         b = (length >> (i * 7)) & 0x7F;
 199         if (i != 0)
 200             b |= 0x80;
 201
 202         bytestream2_put_byteu(pb, b);
 203     }
 204 }
 205
 206 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
 207 {
 208     CFDataRef data;
 209     uint8_t *rw_extradata;
 210     PutByteContext pb;
 211     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
 212     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
 213     int config_size = 13 + 5 + avctx->extradata_size;
 214     int s;
 215
 216     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
 217         return NULL;
 218
 219     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
 220     bytestream2_put_byteu(&pb, 0);        // version
 221     bytestream2_put_ne24(&pb, 0);         // flags
 222
 223     // elementary stream descriptor
 224     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
 225     videotoolbox_write_mp4_descr_length(&pb, full_size);
 226     bytestream2_put_ne16(&pb, 0);         // esid
 227     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
 228
 229     // decoder configuration descriptor
 230     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
 231     videotoolbox_write_mp4_descr_length(&pb, config_size);
 232     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
 233     bytestream2_put_byteu(&pb, 0x11);     // stream type
 234     bytestream2_put_ne24(&pb, 0);         // buffer size
 235     bytestream2_put_ne32(&pb, 0);         // max bitrate
 236     bytestream2_put_ne32(&pb, 0);         // avg bitrate
 237
 238     // decoder specific descriptor
 239     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
 240     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
 241
 242     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
 243
 244     // SLConfigDescriptor
 245     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
 246     bytestream2_put_byteu(&pb, 0x01);     // length
 247     bytestream2_put_byteu(&pb, 0x02);     //
 248
 249     s = bytestream2_size_p(&pb);
 250
 251     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
 252
 253     av_freep(&rw_extradata);
 254     return data;
 255 }
 256
 257 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
 258                                                            void *buffer,
 259                                                            int size)
 260 {
 261     OSStatus status;
 262     CMBlockBufferRef  block_buf;
 263     CMSampleBufferRef sample_buf;
 264
 265     block_buf  = NULL;
 266     sample_buf = NULL;
 267
 268     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
 269                                                 buffer,             // memoryBlock
 270                                                 size,               // blockLength
 271                                                 kCFAllocatorNull,   // blockAllocator
 272                                                 NULL,               // customBlockSource
 273                                                 0,                  // offsetToData
 274                                                 size,               // dataLength
 275                                                 0,                  // flags
 276                                                 &block_buf);
 277
 278     if (!status) {
 279         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
 280                                       block_buf,            // dataBuffer
 281                                       TRUE,                 // dataReady
 282                                       0,                    // makeDataReadyCallback
 283                                       0,                    // makeDataReadyRefcon
 284                                       fmt_desc,             // formatDescription
 285                                       1,                    // numSamples
 286                                       0,                    // numSampleTimingEntries
 287                                       NULL,                 // sampleTimingArray
 288                                       0,                    // numSampleSizeEntries
 289                                       NULL,                 // sampleSizeArray
 290                                       &sample_buf);
 291     }
 292
 293     if (block_buf)
 294         CFRelease(block_buf);
 295
 296     return sample_buf;
 297 }
 298
 299 static void videotoolbox_decoder_callback(void *opaque,
 300                                           void *sourceFrameRefCon,
 301                                           OSStatus status,
 302                                           VTDecodeInfoFlags flags,
 303                                           CVImageBufferRef image_buffer,
 304                                           CMTime pts,
 305                                           CMTime duration)
 306 {
 307     AVCodecContext *avctx = opaque;
 308     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 309
 310     if (vtctx->frame) {
 311         CVPixelBufferRelease(vtctx->frame);
 312         vtctx->frame = NULL;
 313     }
 314
 315     if (!image_buffer) {
 316         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
 317         return;
 318     }
 319
 320     vtctx->frame = CVPixelBufferRetain(image_buffer);
 321 }
 322
 323 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
 324 {
 325     OSStatus status;
 326     CMSampleBufferRef sample_buf;
 327     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 328     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 329
 330     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
 331                                                    vtctx->bitstream,
 332                                                    vtctx->bitstream_size);
 333
 334     if (!sample_buf)
 335         return -1;
 336
 337     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
 338                                                sample_buf,
 339                                                0,       // decodeFlags
 340                                                NULL,    // sourceFrameRefCon
 341                                                0);      // infoFlagsOut
 342     if (status == noErr)
 343         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
 344
 345     CFRelease(sample_buf);
 346
 347     return status;
 348 }
 349
 350 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
 351 {
 352     int status;
 353     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 354     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 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                                                                    1,
 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     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
 480     CFRelease(io_surface_properties);
 481     CFRelease(cv_pix_fmt);
 482     CFRelease(w);
 483     CFRelease(h);
 484
 485     return buffer_attributes;
 486 }
 487
 488 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
 489                                                                    CFDictionaryRef decoder_spec,
 490                                                                    int width,
 491                                                                    int height)
 492 {
 493     CMFormatDescriptionRef cm_fmt_desc;
 494     OSStatus status;
 495
 496     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 497                                             codec_type,
 498                                             width,
 499                                             height,
 500                                             decoder_spec, // Dictionary of extension
 501                                             &cm_fmt_desc);
 502
 503     if (status)
 504         return NULL;
 505
 506     return cm_fmt_desc;
 507 }
 508
 509 static int videotoolbox_default_init(AVCodecContext *avctx)
 510 {
 511     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 512     OSStatus status;
 513     VTDecompressionOutputCallbackRecord decoder_cb;
 514     CFDictionaryRef decoder_spec;
 515     CFDictionaryRef buf_attr;
 516
 517     if (!videotoolbox) {
 518         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 519         return -1;
 520     }
 521
 522     switch( avctx->codec_id ) {
 523     case AV_CODEC_ID_H263 :
 524         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 525         break;
 526     case AV_CODEC_ID_H264 :
 527         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 528         break;
 529     case AV_CODEC_ID_MPEG1VIDEO :
 530         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 531         break;
 532     case AV_CODEC_ID_MPEG2VIDEO :
 533         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 534         break;
 535     case AV_CODEC_ID_MPEG4 :
 536         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 537         break;
 538     default :
 539         break;
 540     }
 541
 542     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 543
 544     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
 545                                                                 decoder_spec,
 546                                                                 avctx->width,
 547                                                                 avctx->height);
 548     if (!videotoolbox->cm_fmt_desc) {
 549         if (decoder_spec)
 550             CFRelease(decoder_spec);
 551
 552         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 553         return -1;
 554     }
 555
 556     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 557                                                      avctx->height,
 558                                                      videotoolbox->cv_pix_fmt_type);
 559
 560     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 561     decoder_cb.decompressionOutputRefCon   = avctx;
 562
 563     status = VTDecompressionSessionCreate(NULL,                      // allocator
 564                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 565                                           decoder_spec,              // videoDecoderSpecification
 566                                           buf_attr,                  // destinationImageBufferAttributes
 567                                           &decoder_cb,               // outputCallback
 568                                           &videotoolbox->session);   // decompressionSessionOut
 569
 570     if (decoder_spec)
 571         CFRelease(decoder_spec);
 572     if (buf_attr)
 573         CFRelease(buf_attr);
 574
 575     switch (status) {
 576     case kVTVideoDecoderNotAvailableNowErr:
 577     case kVTVideoDecoderUnsupportedDataFormatErr:
 578         return AVERROR(ENOSYS);
 579     case kVTVideoDecoderMalfunctionErr:
 580         return AVERROR(EINVAL);
 581     case kVTVideoDecoderBadDataErr :
 582         return AVERROR_INVALIDDATA;
 583     case 0:
 584         return 0;
 585     default:
 586         return AVERROR_UNKNOWN;
 587     }
 588 }
 589
 590 static void videotoolbox_default_free(AVCodecContext *avctx)
 591 {
 592     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 593
 594     if (videotoolbox) {
 595         if (videotoolbox->cm_fmt_desc)
 596             CFRelease(videotoolbox->cm_fmt_desc);
 597
 598         if (videotoolbox->session)
 599             VTDecompressionSessionInvalidate(videotoolbox->session);
 600     }
 601 }
 602
 603 AVHWAccel ff_h263_videotoolbox_hwaccel = {
 604     .name           = "h263_videotoolbox",
 605     .type           = AVMEDIA_TYPE_VIDEO,
 606     .id             = AV_CODEC_ID_H263,
 607     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 608     .alloc_frame    = ff_videotoolbox_alloc_frame,
 609     .start_frame    = videotoolbox_mpeg_start_frame,
 610     .decode_slice   = videotoolbox_mpeg_decode_slice,
 611     .end_frame      = videotoolbox_mpeg_end_frame,
 612     .uninit         = ff_videotoolbox_uninit,
 613     .priv_data_size = sizeof(VTContext),
 614 };
 615
 616 AVHWAccel ff_h264_videotoolbox_hwaccel = {
 617     .name           = "h264_videotoolbox",
 618     .type           = AVMEDIA_TYPE_VIDEO,
 619     .id             = AV_CODEC_ID_H264,
 620     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 621     .alloc_frame    = ff_videotoolbox_alloc_frame,
 622     .start_frame    = ff_videotoolbox_h264_start_frame,
 623     .decode_slice   = ff_videotoolbox_h264_decode_slice,
 624     .end_frame      = videotoolbox_h264_end_frame,
 625     .uninit         = ff_videotoolbox_uninit,
 626     .priv_data_size = sizeof(VTContext),
 627 };
 628
 629 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
 630     .name           = "mpeg1_videotoolbox",
 631     .type           = AVMEDIA_TYPE_VIDEO,
 632     .id             = AV_CODEC_ID_MPEG1VIDEO,
 633     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 634     .alloc_frame    = ff_videotoolbox_alloc_frame,
 635     .start_frame    = videotoolbox_mpeg_start_frame,
 636     .decode_slice   = videotoolbox_mpeg_decode_slice,
 637     .end_frame      = videotoolbox_mpeg_end_frame,
 638     .uninit         = ff_videotoolbox_uninit,
 639     .priv_data_size = sizeof(VTContext),
 640 };
 641
 642 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
 643     .name           = "mpeg2_videotoolbox",
 644     .type           = AVMEDIA_TYPE_VIDEO,
 645     .id             = AV_CODEC_ID_MPEG2VIDEO,
 646     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 647     .alloc_frame    = ff_videotoolbox_alloc_frame,
 648     .start_frame    = videotoolbox_mpeg_start_frame,
 649     .decode_slice   = videotoolbox_mpeg_decode_slice,
 650     .end_frame      = videotoolbox_mpeg_end_frame,
 651     .uninit         = ff_videotoolbox_uninit,
 652     .priv_data_size = sizeof(VTContext),
 653 };
 654
 655 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
 656     .name           = "mpeg4_videotoolbox",
 657     .type           = AVMEDIA_TYPE_VIDEO,
 658     .id             = AV_CODEC_ID_MPEG4,
 659     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 660     .alloc_frame    = ff_videotoolbox_alloc_frame,
 661     .start_frame    = videotoolbox_mpeg_start_frame,
 662     .decode_slice   = videotoolbox_mpeg_decode_slice,
 663     .end_frame      = videotoolbox_mpeg_end_frame,
 664     .uninit         = ff_videotoolbox_uninit,
 665     .priv_data_size = sizeof(VTContext),
 666 };
 667
 668 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
 669 {
 670     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
 671
 672     if (ret) {
 673         ret->output_callback = videotoolbox_decoder_callback;
 674         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
 675     }
 676
 677     return ret;
 678 }
 679
 680 int av_videotoolbox_default_init(AVCodecContext *avctx)
 681 {
 682     return av_videotoolbox_default_init2(avctx, NULL);
 683 }
 684
 685 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
 686 {
 687     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
 688     if (!avctx->hwaccel_context)
 689         return AVERROR(ENOMEM);
 690     return videotoolbox_default_init(avctx);
 691 }
 692
 693 void av_videotoolbox_default_free(AVCodecContext *avctx)
 694 {
 695
 696     videotoolbox_default_free(avctx);
 697     av_freep(&avctx->hwaccel_context);
 698 }
 699 #endif /* CONFIG_VIDEOTOOLBOX */