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->ps.sps->data_size + 4 + 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[0]); /* profile */
  96     AV_W8(p + 2, h->ps.sps->data[1]); /* profile compat */
  97     AV_W8(p + 3, h->ps.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->ps.sps->data_size + 1);
 101     AV_W8(p + 8, NAL_SPS | (3 << 5)); // NAL unit header
 102     memcpy(p + 9, h->ps.sps->data, h->ps.sps->data_size);
 103     p += 9 + h->ps.sps->data_size;
 104     AV_W8(p + 0, 1); /* number of pps */
 105     AV_WB16(p + 1, h->ps.pps->data_size + 1);
 106     AV_W8(p + 3, NAL_PPS | (3 << 5)); // NAL unit header
 107     memcpy(p + 4, h->ps.pps->data, h->ps.pps->data_size);
 108
 109     p += 4 + h->ps.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     av_buffer_unref(&frame->buf[0]);
 357
 358     if (!videotoolbox->session || !vtctx->bitstream)
 359         return AVERROR_INVALIDDATA;
 360
 361     status = videotoolbox_session_decode_frame(avctx);
 362
 363     if (status) {
 364         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
 365         return AVERROR_UNKNOWN;
 366     }
 367
 368     if (!vtctx->frame)
 369         return AVERROR_UNKNOWN;
 370
 371     return ff_videotoolbox_buffer_create(vtctx, frame);
 372 }
 373
 374 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
 375 {
 376     H264Context *h = avctx->priv_data;
 377     AVFrame *frame = h->cur_pic_ptr->f;
 378
 379     return videotoolbox_common_end_frame(avctx, frame);
 380 }
 381
 382 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
 383                                          const uint8_t *buffer,
 384                                          uint32_t size)
 385 {
 386     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 387
 388     return videotoolbox_buffer_copy(vtctx, buffer, size);
 389 }
 390
 391 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
 392                                           const uint8_t *buffer,
 393                                           uint32_t size)
 394 {
 395     return 0;
 396 }
 397
 398 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
 399 {
 400     MpegEncContext *s = avctx->priv_data;
 401     AVFrame *frame = s->current_picture_ptr->f;
 402
 403     return videotoolbox_common_end_frame(avctx, frame);
 404 }
 405
 406 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
 407                                                           AVCodecContext *avctx)
 408 {
 409     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 410                                                                    0,
 411                                                                    &kCFTypeDictionaryKeyCallBacks,
 412                                                                    &kCFTypeDictionaryValueCallBacks);
 413
 414     CFDictionarySetValue(config_info,
 415                          kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
 416                          kCFBooleanTrue);
 417
 418     if (avctx->extradata_size) {
 419         CFMutableDictionaryRef avc_info;
 420         CFDataRef data = NULL;
 421
 422         avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 423                                              1,
 424                                              &kCFTypeDictionaryKeyCallBacks,
 425                                              &kCFTypeDictionaryValueCallBacks);
 426
 427         switch (codec_type) {
 428         case kCMVideoCodecType_MPEG4Video :
 429             data = videotoolbox_esds_extradata_create(avctx);
 430             if (data)
 431                 CFDictionarySetValue(avc_info, CFSTR("esds"), data);
 432             break;
 433         case kCMVideoCodecType_H264 :
 434             data = ff_videotoolbox_avcc_extradata_create(avctx);
 435             if (data)
 436                 CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
 437             break;
 438         default:
 439             break;
 440         }
 441
 442         CFDictionarySetValue(config_info,
 443                 kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
 444                 avc_info);
 445
 446         if (data)
 447             CFRelease(data);
 448
 449         CFRelease(avc_info);
 450     }
 451     return config_info;
 452 }
 453
 454 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
 455                                                              int height,
 456                                                              OSType pix_fmt)
 457 {
 458     CFMutableDictionaryRef buffer_attributes;
 459     CFMutableDictionaryRef io_surface_properties;
 460     CFNumberRef cv_pix_fmt;
 461     CFNumberRef w;
 462     CFNumberRef h;
 463
 464     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
 465     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
 466     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
 467
 468     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 469                                                   4,
 470                                                   &kCFTypeDictionaryKeyCallBacks,
 471                                                   &kCFTypeDictionaryValueCallBacks);
 472     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 473                                                       0,
 474                                                       &kCFTypeDictionaryKeyCallBacks,
 475                                                       &kCFTypeDictionaryValueCallBacks);
 476
 477     CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
 478     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
 479     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
 480     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
 481
 482     CFRelease(io_surface_properties);
 483     CFRelease(cv_pix_fmt);
 484     CFRelease(w);
 485     CFRelease(h);
 486
 487     return buffer_attributes;
 488 }
 489
 490 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(AVCodecContext *avctx,
 491                                                                    CMVideoCodecType codec_type,
 492                                                                    CFDictionaryRef decoder_spec,
 493                                                                    int width,
 494                                                                    int height)
 495 {
 496     CMFormatDescriptionRef cm_fmt_desc = NULL;
 497     int status;
 498
 499 #if TARGET_OS_IPHONE || defined(__MAC_10_9)
 500     H264Context *h = codec_type == kCMVideoCodecType_H264 ? avctx->priv_data : NULL;
 501
 502     if (h && h->ps.sps->data_size && h->ps.pps->data_size) {
 503         int ps_count = 2;
 504         const uint8_t **ps_data = av_malloc(sizeof(uint8_t*) * ps_count);
 505         size_t *ps_sizes = av_malloc(sizeof(size_t)  * ps_count);
 506
 507         ps_data[0]  = h->ps.sps->data;
 508         ps_sizes[0] = h->ps.sps->data_size;
 509
 510         ps_data[1]  = h->ps.pps->data;
 511         ps_sizes[1] = h->ps.pps->data_size;
 512
 513         status = CMVideoFormatDescriptionCreateFromH264ParameterSets(NULL,
 514                                                                      ps_count,
 515                                                                      ps_data,
 516                                                                      ps_sizes,
 517                                                                      4,
 518                                                                      &cm_fmt_desc);
 519         av_freep(&ps_sizes);
 520         av_freep(&ps_data);
 521
 522         if (status) {
 523             av_log(avctx, AV_LOG_ERROR, "Error creating H.264 format description: %d\n", status);
 524             return NULL;
 525         }
 526     } else {
 527 #endif
 528         status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 529                                                 codec_type,
 530                                                 width,
 531                                                 height,
 532                                                 decoder_spec, // Dictionary of extension
 533                                                 &cm_fmt_desc);
 534
 535         if (status) {
 536             av_log(avctx, AV_LOG_ERROR, "Error creating format description: %d\n", status);
 537             return NULL;
 538         }
 539 #if TARGET_OS_IPHONE || defined(__MAC_10_9)
 540     }
 541 #endif
 542
 543     return cm_fmt_desc;
 544 }
 545
 546 static int videotoolbox_default_init(AVCodecContext *avctx)
 547 {
 548     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 549     OSStatus status;
 550     VTDecompressionOutputCallbackRecord decoder_cb;
 551     CFDictionaryRef decoder_spec;
 552     CFDictionaryRef buf_attr;
 553
 554     if (!videotoolbox) {
 555         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 556         return -1;
 557     }
 558
 559     switch( avctx->codec_id ) {
 560     case AV_CODEC_ID_H263 :
 561         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 562         break;
 563     case AV_CODEC_ID_H264 :
 564         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 565         break;
 566     case AV_CODEC_ID_MPEG1VIDEO :
 567         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 568         break;
 569     case AV_CODEC_ID_MPEG2VIDEO :
 570         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 571         break;
 572     case AV_CODEC_ID_MPEG4 :
 573         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 574         break;
 575     default :
 576         break;
 577     }
 578
 579     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 580
 581     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(avctx,
 582                                                                 videotoolbox->cm_codec_type,
 583                                                                 decoder_spec,
 584                                                                 avctx->width,
 585                                                                 avctx->height);
 586     if (!videotoolbox->cm_fmt_desc) {
 587         if (decoder_spec)
 588             CFRelease(decoder_spec);
 589
 590         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 591         return -1;
 592     }
 593
 594     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 595                                                      avctx->height,
 596                                                      videotoolbox->cv_pix_fmt_type);
 597
 598     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 599     decoder_cb.decompressionOutputRefCon   = avctx;
 600
 601     status = VTDecompressionSessionCreate(NULL,                      // allocator
 602                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 603                                           decoder_spec,              // videoDecoderSpecification
 604                                           buf_attr,                  // destinationImageBufferAttributes
 605                                           &decoder_cb,               // outputCallback
 606                                           &videotoolbox->session);   // decompressionSessionOut
 607
 608     if (decoder_spec)
 609         CFRelease(decoder_spec);
 610     if (buf_attr)
 611         CFRelease(buf_attr);
 612
 613     switch (status) {
 614     case kVTVideoDecoderNotAvailableNowErr:
 615     case kVTVideoDecoderUnsupportedDataFormatErr:
 616         return AVERROR(ENOSYS);
 617     case kVTVideoDecoderMalfunctionErr:
 618         return AVERROR(EINVAL);
 619     case kVTVideoDecoderBadDataErr :
 620         return AVERROR_INVALIDDATA;
 621     case 0:
 622         return 0;
 623     default:
 624         return AVERROR_UNKNOWN;
 625     }
 626 }
 627
 628 static void videotoolbox_default_free(AVCodecContext *avctx)
 629 {
 630     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
 631
 632     if (videotoolbox) {
 633         if (videotoolbox->cm_fmt_desc)
 634             CFRelease(videotoolbox->cm_fmt_desc);
 635
 636         if (videotoolbox->session) {
 637             VTDecompressionSessionInvalidate(videotoolbox->session);
 638             CFRelease(videotoolbox->session);
 639         }
 640     }
 641 }
 642
 643 AVHWAccel ff_h263_videotoolbox_hwaccel = {
 644     .name           = "h263_videotoolbox",
 645     .type           = AVMEDIA_TYPE_VIDEO,
 646     .id             = AV_CODEC_ID_H263,
 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 AVHWAccel ff_h264_videotoolbox_hwaccel = {
 657     .name           = "h264_videotoolbox",
 658     .type           = AVMEDIA_TYPE_VIDEO,
 659     .id             = AV_CODEC_ID_H264,
 660     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 661     .alloc_frame    = ff_videotoolbox_alloc_frame,
 662     .start_frame    = ff_videotoolbox_h264_start_frame,
 663     .decode_slice   = ff_videotoolbox_h264_decode_slice,
 664     .end_frame      = videotoolbox_h264_end_frame,
 665     .uninit         = ff_videotoolbox_uninit,
 666     .priv_data_size = sizeof(VTContext),
 667 };
 668
 669 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
 670     .name           = "mpeg1_videotoolbox",
 671     .type           = AVMEDIA_TYPE_VIDEO,
 672     .id             = AV_CODEC_ID_MPEG1VIDEO,
 673     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 674     .alloc_frame    = ff_videotoolbox_alloc_frame,
 675     .start_frame    = videotoolbox_mpeg_start_frame,
 676     .decode_slice   = videotoolbox_mpeg_decode_slice,
 677     .end_frame      = videotoolbox_mpeg_end_frame,
 678     .uninit         = ff_videotoolbox_uninit,
 679     .priv_data_size = sizeof(VTContext),
 680 };
 681
 682 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
 683     .name           = "mpeg2_videotoolbox",
 684     .type           = AVMEDIA_TYPE_VIDEO,
 685     .id             = AV_CODEC_ID_MPEG2VIDEO,
 686     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 687     .alloc_frame    = ff_videotoolbox_alloc_frame,
 688     .start_frame    = videotoolbox_mpeg_start_frame,
 689     .decode_slice   = videotoolbox_mpeg_decode_slice,
 690     .end_frame      = videotoolbox_mpeg_end_frame,
 691     .uninit         = ff_videotoolbox_uninit,
 692     .priv_data_size = sizeof(VTContext),
 693 };
 694
 695 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
 696     .name           = "mpeg4_videotoolbox",
 697     .type           = AVMEDIA_TYPE_VIDEO,
 698     .id             = AV_CODEC_ID_MPEG4,
 699     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
 700     .alloc_frame    = ff_videotoolbox_alloc_frame,
 701     .start_frame    = videotoolbox_mpeg_start_frame,
 702     .decode_slice   = videotoolbox_mpeg_decode_slice,
 703     .end_frame      = videotoolbox_mpeg_end_frame,
 704     .uninit         = ff_videotoolbox_uninit,
 705     .priv_data_size = sizeof(VTContext),
 706 };
 707
 708 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
 709 {
 710     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
 711
 712     if (ret) {
 713         ret->output_callback = videotoolbox_decoder_callback;
 714         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
 715     }
 716
 717     return ret;
 718 }
 719
 720 int av_videotoolbox_default_init(AVCodecContext *avctx)
 721 {
 722     return av_videotoolbox_default_init2(avctx, NULL);
 723 }
 724
 725 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
 726 {
 727     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
 728     if (!avctx->hwaccel_context)
 729         return AVERROR(ENOMEM);
 730     return videotoolbox_default_init(avctx);
 731 }
 732
 733 void av_videotoolbox_default_free(AVCodecContext *avctx)
 734 {
 735
 736     videotoolbox_default_free(avctx);
 737     av_freep(&avctx->hwaccel_context);
 738 }
 739 #endif /* CONFIG_VIDEOTOOLBOX */