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 #include "videotoolbox.h"
  25 #include "libavutil/hwcontext_videotoolbox.h"
  26 #include "vt_internal.h"
  27 #include "libavutil/avutil.h"
  28 #include "libavutil/hwcontext.h"
  29 #include "bytestream.h"
  30 #include "decode.h"
  31 #include "h264dec.h"
  32 #include "hevcdec.h"
  33 #include "mpegvideo.h"
  34 #include <TargetConditionals.h>
  35
  36 #ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
  37 #  define kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder CFSTR("RequireHardwareAcceleratedVideoDecoder")
  38 #endif
  39
  40 #if !HAVE_KCMVIDEOCODECTYPE_HEVC
  41 enum { kCMVideoCodecType_HEVC = 'hvc1' };
  42 #endif
  43
  44 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
  45
  46 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
  47 {
  48     CVPixelBufferRef cv_buffer = (CVImageBufferRef)data;
  49     CVPixelBufferRelease(cv_buffer);
  50 }
  51
  52 static int videotoolbox_buffer_copy(VTContext *vtctx,
  53                                     const uint8_t *buffer,
  54                                     uint32_t size)
  55 {
  56     void *tmp;
  57
  58     tmp = av_fast_realloc(vtctx->bitstream,
  59                          &vtctx->allocated_size,
  60                          size);
  61
  62     if (!tmp)
  63         return AVERROR(ENOMEM);
  64
  65     vtctx->bitstream = tmp;
  66     memcpy(vtctx->bitstream, buffer, size);
  67     vtctx->bitstream_size = size;
  68
  69     return 0;
  70 }
  71
  72 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
  73 {
  74     int ret = ff_attach_decode_data(frame);
  75     if (ret < 0)
  76         return ret;
  77
  78     frame->width  = avctx->width;
  79     frame->height = avctx->height;
  80     frame->format = avctx->pix_fmt;
  81     frame->buf[0] = av_buffer_alloc(1);
  82
  83     if (!frame->buf[0])
  84         return AVERROR(ENOMEM);
  85
  86     return 0;
  87 }
  88
  89 #define AV_W8(p, v) *(p) = (v)
  90
  91 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
  92 {
  93     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
  94     H264Context *h = avctx->priv_data;
  95     CFDataRef data = NULL;
  96     uint8_t *p;
  97     int vt_extradata_size = 6 + 2 + h->ps.sps->data_size + 3 + h->ps.pps->data_size;
  98     uint8_t *vt_extradata = av_malloc(vt_extradata_size);
  99     if (!vt_extradata)
 100         return NULL;
 101
 102     p = vt_extradata;
 103
 104     AV_W8(p + 0, 1); /* version */
 105     AV_W8(p + 1, h->ps.sps->data[1]); /* profile */
 106     AV_W8(p + 2, h->ps.sps->data[2]); /* profile compat */
 107     AV_W8(p + 3, h->ps.sps->data[3]); /* level */
 108     AV_W8(p + 4, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 3 (11) */
 109     AV_W8(p + 5, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
 110     AV_WB16(p + 6, h->ps.sps->data_size);
 111     memcpy(p + 8, h->ps.sps->data, h->ps.sps->data_size);
 112     p += 8 + h->ps.sps->data_size;
 113     AV_W8(p + 0, 1); /* number of pps */
 114     AV_WB16(p + 1, h->ps.pps->data_size);
 115     memcpy(p + 3, h->ps.pps->data, h->ps.pps->data_size);
 116
 117     p += 3 + h->ps.pps->data_size;
 118     av_assert0(p - vt_extradata == vt_extradata_size);
 119
 120     // save sps header (profile/level) used to create decoder session,
 121     // so we can detect changes and recreate it.
 122     if (vtctx)
 123         memcpy(vtctx->sps, h->ps.sps->data + 1, 3);
 124
 125     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 126     av_free(vt_extradata);
 127     return data;
 128 }
 129
 130 CFDataRef ff_videotoolbox_hvcc_extradata_create(AVCodecContext *avctx)
 131 {
 132     HEVCContext *h = avctx->priv_data;
 133     const HEVCVPS *vps = (const HEVCVPS *)h->ps.vps_list[0]->data;
 134     const HEVCSPS *sps = (const HEVCSPS *)h->ps.sps_list[0]->data;
 135     int i, num_pps = 0;
 136     const HEVCPPS *pps = h->ps.pps;
 137     PTLCommon ptlc = vps->ptl.general_ptl;
 138     VUI vui = sps->vui;
 139     uint8_t parallelismType;
 140     CFDataRef data = NULL;
 141     uint8_t *p;
 142     int vt_extradata_size = 23 + 5 + vps->data_size + 5 + sps->data_size + 3;
 143     uint8_t *vt_extradata;
 144
 145     for (i = 0; i < HEVC_MAX_PPS_COUNT; i++) {
 146         if (h->ps.pps_list[i]) {
 147             const HEVCPPS *pps = (const HEVCPPS *)h->ps.pps_list[i]->data;
 148             vt_extradata_size += 2 + pps->data_size;
 149             num_pps++;
 150         }
 151     }
 152
 153     vt_extradata = av_malloc(vt_extradata_size);
 154     if (!vt_extradata)
 155         return NULL;
 156     p = vt_extradata;
 157
 158     /* unsigned int(8) configurationVersion = 1; */
 159     AV_W8(p + 0, 1);
 160
 161     /*
 162      * unsigned int(2) general_profile_space;
 163      * unsigned int(1) general_tier_flag;
 164      * unsigned int(5) general_profile_idc;
 165      */
 166     AV_W8(p + 1, ptlc.profile_space << 6 |
 167                  ptlc.tier_flag     << 5 |
 168                  ptlc.profile_idc);
 169
 170     /* unsigned int(32) general_profile_compatibility_flags; */
 171     memcpy(p + 2, ptlc.profile_compatibility_flag, 4);
 172
 173     /* unsigned int(48) general_constraint_indicator_flags; */
 174     AV_W8(p + 6, ptlc.progressive_source_flag    << 7 |
 175                  ptlc.interlaced_source_flag     << 6 |
 176                  ptlc.non_packed_constraint_flag << 5 |
 177                  ptlc.frame_only_constraint_flag << 4);
 178     AV_W8(p + 7, 0);
 179     AV_WN32(p + 8, 0);
 180
 181     /* unsigned int(8) general_level_idc; */
 182     AV_W8(p + 12, ptlc.level_idc);
 183
 184     /*
 185      * bit(4) reserved = ‘1111’b;
 186      * unsigned int(12) min_spatial_segmentation_idc;
 187      */
 188     AV_W8(p + 13, 0xf0 | (vui.min_spatial_segmentation_idc >> 4));
 189     AV_W8(p + 14, vui.min_spatial_segmentation_idc & 0xff);
 190
 191     /*
 192      * bit(6) reserved = ‘111111’b;
 193      * unsigned int(2) parallelismType;
 194      */
 195     if (!vui.min_spatial_segmentation_idc)
 196         parallelismType = 0;
 197     else if (pps->entropy_coding_sync_enabled_flag && pps->tiles_enabled_flag)
 198         parallelismType = 0;
 199     else if (pps->entropy_coding_sync_enabled_flag)
 200         parallelismType = 3;
 201     else if (pps->tiles_enabled_flag)
 202         parallelismType = 2;
 203     else
 204         parallelismType = 1;
 205     AV_W8(p + 15, 0xfc | parallelismType);
 206
 207     /*
 208      * bit(6) reserved = ‘111111’b;
 209      * unsigned int(2) chromaFormat;
 210      */
 211     AV_W8(p + 16, sps->chroma_format_idc | 0xfc);
 212
 213     /*
 214      * bit(5) reserved = ‘11111’b;
 215      * unsigned int(3) bitDepthLumaMinus8;
 216      */
 217     AV_W8(p + 17, (sps->bit_depth - 8) | 0xfc);
 218
 219     /*
 220      * bit(5) reserved = ‘11111’b;
 221      * unsigned int(3) bitDepthChromaMinus8;
 222      */
 223     AV_W8(p + 18, (sps->bit_depth_chroma - 8) | 0xfc);
 224
 225     /* bit(16) avgFrameRate; */
 226     AV_WB16(p + 19, 0);
 227
 228     /*
 229      * bit(2) constantFrameRate;
 230      * bit(3) numTemporalLayers;
 231      * bit(1) temporalIdNested;
 232      * unsigned int(2) lengthSizeMinusOne;
 233      */
 234     AV_W8(p + 21, 0                             << 6 |
 235                   sps->max_sub_layers           << 3 |
 236                   sps->temporal_id_nesting_flag << 2 |
 237                   3);
 238
 239     /* unsigned int(8) numOfArrays; */
 240     AV_W8(p + 22, 3);
 241
 242     p += 23;
 243     /* vps */
 244     /*
 245      * bit(1) array_completeness;
 246      * unsigned int(1) reserved = 0;
 247      * unsigned int(6) NAL_unit_type;
 248      */
 249     AV_W8(p, 1 << 7 |
 250              HEVC_NAL_VPS & 0x3f);
 251     /* unsigned int(16) numNalus; */
 252     AV_WB16(p + 1, 1);
 253     /* unsigned int(16) nalUnitLength; */
 254     AV_WB16(p + 3, vps->data_size);
 255     /* bit(8*nalUnitLength) nalUnit; */
 256     memcpy(p + 5, vps->data, vps->data_size);
 257     p += 5 + vps->data_size;
 258
 259     /* sps */
 260     AV_W8(p, 1 << 7 |
 261              HEVC_NAL_SPS & 0x3f);
 262     AV_WB16(p + 1, 1);
 263     AV_WB16(p + 3, sps->data_size);
 264     memcpy(p + 5, sps->data, sps->data_size);
 265     p += 5 + sps->data_size;
 266
 267     /* pps */
 268     AV_W8(p, 1 << 7 |
 269              HEVC_NAL_PPS & 0x3f);
 270     AV_WB16(p + 1, num_pps);
 271     p += 3;
 272     for (i = 0; i < HEVC_MAX_PPS_COUNT; i++) {
 273         if (h->ps.pps_list[i]) {
 274             const HEVCPPS *pps = (const HEVCPPS *)h->ps.pps_list[i]->data;
 275             AV_WB16(p, pps->data_size);
 276             memcpy(p + 2, pps->data, pps->data_size);
 277             p += 2 + pps->data_size;
 278         }
 279     }
 280
 281     av_assert0(p - vt_extradata == vt_extradata_size);
 282
 283     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 284     av_free(vt_extradata);
 285     return data;
 286 }
 287
 288 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
 289 {
 290     av_buffer_unref(&frame->buf[0]);
 291
 292     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
 293                                      sizeof(vtctx->frame),
 294                                      videotoolbox_buffer_release,
 295                                      NULL,
 296                                      AV_BUFFER_FLAG_READONLY);
 297     if (!frame->buf[0]) {
 298         return AVERROR(ENOMEM);
 299     }
 300
 301     frame->data[3] = (uint8_t*)vtctx->frame;
 302     vtctx->frame = NULL;
 303
 304     return 0;
 305 }
 306
 307 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
 308                                      const uint8_t *buffer,
 309                                      uint32_t size)
 310 {
 311     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 312     H264Context *h  = avctx->priv_data;
 313
 314     if (h->is_avc == 1) {
 315         return videotoolbox_buffer_copy(vtctx, buffer, size);
 316     }
 317
 318     return 0;
 319 }
 320
 321 static int videotoolbox_h264_decode_params(AVCodecContext *avctx,
 322                                            int type,
 323                                            const uint8_t *buffer,
 324                                            uint32_t size)
 325 {
 326     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 327     H264Context *h = avctx->priv_data;
 328
 329     // save sps header (profile/level) used to create decoder session
 330     if (!vtctx->sps[0])
 331         memcpy(vtctx->sps, h->ps.sps->data + 1, 3);
 332
 333     if (type == H264_NAL_SPS) {
 334         if (size > 4 && memcmp(vtctx->sps, buffer + 1, 3) != 0) {
 335             vtctx->reconfig_needed = true;
 336             memcpy(vtctx->sps, buffer + 1, 3);
 337         }
 338     }
 339
 340     // pass-through SPS/PPS changes to the decoder
 341     return ff_videotoolbox_h264_decode_slice(avctx, buffer, size);
 342 }
 343
 344 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
 345                                       const uint8_t *buffer,
 346                                       uint32_t size)
 347 {
 348     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 349     H264Context *h  = avctx->priv_data;
 350     void *tmp;
 351
 352     if (h->is_avc == 1)
 353         return 0;
 354
 355     tmp = av_fast_realloc(vtctx->bitstream,
 356                           &vtctx->allocated_size,
 357                           vtctx->bitstream_size+size+4);
 358     if (!tmp)
 359         return AVERROR(ENOMEM);
 360
 361     vtctx->bitstream = tmp;
 362
 363     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
 364     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
 365
 366     vtctx->bitstream_size += size + 4;
 367
 368     return 0;
 369 }
 370
 371 int ff_videotoolbox_uninit(AVCodecContext *avctx)
 372 {
 373     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 374     if (vtctx) {
 375         av_freep(&vtctx->bitstream);
 376         if (vtctx->frame)
 377             CVPixelBufferRelease(vtctx->frame);
 378     }
 379
 380     return 0;
 381 }
 382
 383 #if CONFIG_VIDEOTOOLBOX
 384 // Return the AVVideotoolboxContext that matters currently. Where it comes from
 385 // depends on the API used.
 386 static AVVideotoolboxContext *videotoolbox_get_context(AVCodecContext *avctx)
 387 {
 388     // Somewhat tricky because the user can call av_videotoolbox_default_free()
 389     // at any time, even when the codec is closed.
 390     if (avctx->internal && avctx->internal->hwaccel_priv_data) {
 391         VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 392         if (vtctx->vt_ctx)
 393             return vtctx->vt_ctx;
 394     }
 395     return avctx->hwaccel_context;
 396 }
 397
 398 static int videotoolbox_buffer_create(AVCodecContext *avctx, AVFrame *frame)
 399 {
 400     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 401     CVPixelBufferRef pixbuf = (CVPixelBufferRef)vtctx->frame;
 402     OSType pixel_format = CVPixelBufferGetPixelFormatType(pixbuf);
 403     enum AVPixelFormat sw_format = av_map_videotoolbox_format_to_pixfmt(pixel_format);
 404     int width = CVPixelBufferGetWidth(pixbuf);
 405     int height = CVPixelBufferGetHeight(pixbuf);
 406     AVHWFramesContext *cached_frames;
 407     int ret;
 408
 409     ret = ff_videotoolbox_buffer_create(vtctx, frame);
 410     if (ret < 0)
 411         return ret;
 412
 413     // Old API code path.
 414     if (!vtctx->cached_hw_frames_ctx)
 415         return 0;
 416
 417     cached_frames = (AVHWFramesContext*)vtctx->cached_hw_frames_ctx->data;
 418
 419     if (cached_frames->sw_format != sw_format ||
 420         cached_frames->width != width ||
 421         cached_frames->height != height) {
 422         AVBufferRef *hw_frames_ctx = av_hwframe_ctx_alloc(cached_frames->device_ref);
 423         AVHWFramesContext *hw_frames;
 424         if (!hw_frames_ctx)
 425             return AVERROR(ENOMEM);
 426
 427         hw_frames = (AVHWFramesContext*)hw_frames_ctx->data;
 428         hw_frames->format = cached_frames->format;
 429         hw_frames->sw_format = sw_format;
 430         hw_frames->width = width;
 431         hw_frames->height = height;
 432
 433         ret = av_hwframe_ctx_init(hw_frames_ctx);
 434         if (ret < 0) {
 435             av_buffer_unref(&hw_frames_ctx);
 436             return ret;
 437         }
 438
 439         av_buffer_unref(&vtctx->cached_hw_frames_ctx);
 440         vtctx->cached_hw_frames_ctx = hw_frames_ctx;
 441     }
 442
 443     av_buffer_unref(&frame->hw_frames_ctx);
 444     frame->hw_frames_ctx = av_buffer_ref(vtctx->cached_hw_frames_ctx);
 445     if (!frame->hw_frames_ctx)
 446         return AVERROR(ENOMEM);
 447
 448     return 0;
 449 }
 450
 451 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
 452 {
 453     int i;
 454     uint8_t b;
 455
 456     for (i = 3; i >= 0; i--) {
 457         b = (length >> (i * 7)) & 0x7F;
 458         if (i != 0)
 459             b |= 0x80;
 460
 461         bytestream2_put_byteu(pb, b);
 462     }
 463 }
 464
 465 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
 466 {
 467     CFDataRef data;
 468     uint8_t *rw_extradata;
 469     PutByteContext pb;
 470     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
 471     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
 472     int config_size = 13 + 5 + avctx->extradata_size;
 473     int s;
 474
 475     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
 476         return NULL;
 477
 478     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
 479     bytestream2_put_byteu(&pb, 0);        // version
 480     bytestream2_put_ne24(&pb, 0);         // flags
 481
 482     // elementary stream descriptor
 483     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
 484     videotoolbox_write_mp4_descr_length(&pb, full_size);
 485     bytestream2_put_ne16(&pb, 0);         // esid
 486     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
 487
 488     // decoder configuration descriptor
 489     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
 490     videotoolbox_write_mp4_descr_length(&pb, config_size);
 491     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
 492     bytestream2_put_byteu(&pb, 0x11);     // stream type
 493     bytestream2_put_ne24(&pb, 0);         // buffer size
 494     bytestream2_put_ne32(&pb, 0);         // max bitrate
 495     bytestream2_put_ne32(&pb, 0);         // avg bitrate
 496
 497     // decoder specific descriptor
 498     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
 499     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
 500
 501     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
 502
 503     // SLConfigDescriptor
 504     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
 505     bytestream2_put_byteu(&pb, 0x01);     // length
 506     bytestream2_put_byteu(&pb, 0x02);     //
 507
 508     s = bytestream2_size_p(&pb);
 509
 510     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
 511
 512     av_freep(&rw_extradata);
 513     return data;
 514 }
 515
 516 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
 517                                                            void *buffer,
 518                                                            int size)
 519 {
 520     OSStatus status;
 521     CMBlockBufferRef  block_buf;
 522     CMSampleBufferRef sample_buf;
 523
 524     block_buf  = NULL;
 525     sample_buf = NULL;
 526
 527     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
 528                                                 buffer,             // memoryBlock
 529                                                 size,               // blockLength
 530                                                 kCFAllocatorNull,   // blockAllocator
 531                                                 NULL,               // customBlockSource
 532                                                 0,                  // offsetToData
 533                                                 size,               // dataLength
 534                                                 0,                  // flags
 535                                                 &block_buf);
 536
 537     if (!status) {
 538         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
 539                                       block_buf,            // dataBuffer
 540                                       TRUE,                 // dataReady
 541                                       0,                    // makeDataReadyCallback
 542                                       0,                    // makeDataReadyRefcon
 543                                       fmt_desc,             // formatDescription
 544                                       1,                    // numSamples
 545                                       0,                    // numSampleTimingEntries
 546                                       NULL,                 // sampleTimingArray
 547                                       0,                    // numSampleSizeEntries
 548                                       NULL,                 // sampleSizeArray
 549                                       &sample_buf);
 550     }
 551
 552     if (block_buf)
 553         CFRelease(block_buf);
 554
 555     return sample_buf;
 556 }
 557
 558 static void videotoolbox_decoder_callback(void *opaque,
 559                                           void *sourceFrameRefCon,
 560                                           OSStatus status,
 561                                           VTDecodeInfoFlags flags,
 562                                           CVImageBufferRef image_buffer,
 563                                           CMTime pts,
 564                                           CMTime duration)
 565 {
 566     AVCodecContext *avctx = opaque;
 567     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 568
 569     if (vtctx->frame) {
 570         CVPixelBufferRelease(vtctx->frame);
 571         vtctx->frame = NULL;
 572     }
 573
 574     if (!image_buffer) {
 575         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
 576         return;
 577     }
 578
 579     vtctx->frame = CVPixelBufferRetain(image_buffer);
 580 }
 581
 582 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
 583 {
 584     OSStatus status;
 585     CMSampleBufferRef sample_buf;
 586     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 587     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 588
 589     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
 590                                                    vtctx->bitstream,
 591                                                    vtctx->bitstream_size);
 592
 593     if (!sample_buf)
 594         return -1;
 595
 596     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
 597                                                sample_buf,
 598                                                0,       // decodeFlags
 599                                                NULL,    // sourceFrameRefCon
 600                                                0);      // infoFlagsOut
 601     if (status == noErr)
 602         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
 603
 604     CFRelease(sample_buf);
 605
 606     return status;
 607 }
 608
 609 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
 610                                                                    CFDictionaryRef decoder_spec,
 611                                                                    int width,
 612                                                                    int height)
 613 {
 614     CMFormatDescriptionRef cm_fmt_desc;
 615     OSStatus status;
 616
 617     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 618                                             codec_type,
 619                                             width,
 620                                             height,
 621                                             decoder_spec, // Dictionary of extension
 622                                             &cm_fmt_desc);
 623
 624     if (status)
 625         return NULL;
 626
 627     return cm_fmt_desc;
 628 }
 629
 630 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
 631                                                              int height,
 632                                                              OSType pix_fmt)
 633 {
 634     CFMutableDictionaryRef buffer_attributes;
 635     CFMutableDictionaryRef io_surface_properties;
 636     CFNumberRef cv_pix_fmt;
 637     CFNumberRef w;
 638     CFNumberRef h;
 639
 640     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
 641     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
 642     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
 643
 644     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 645                                                   4,
 646                                                   &kCFTypeDictionaryKeyCallBacks,
 647                                                   &kCFTypeDictionaryValueCallBacks);
 648     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 649                                                       0,
 650                                                       &kCFTypeDictionaryKeyCallBacks,
 651                                                       &kCFTypeDictionaryValueCallBacks);
 652
 653     if (pix_fmt)
 654         CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
 655     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
 656     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
 657     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
 658 #if TARGET_OS_IPHONE
 659     CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
 660 #else
 661     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
 662 #endif
 663
 664     CFRelease(io_surface_properties);
 665     CFRelease(cv_pix_fmt);
 666     CFRelease(w);
 667     CFRelease(h);
 668
 669     return buffer_attributes;
 670 }
 671
 672 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
 673                                                           AVCodecContext *avctx)
 674 {
 675     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 676                                                                    0,
 677                                                                    &kCFTypeDictionaryKeyCallBacks,
 678                                                                    &kCFTypeDictionaryValueCallBacks);
 679
 680     CFDictionarySetValue(config_info,
 681                          kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
 682                          kCFBooleanTrue);
 683
 684     CFMutableDictionaryRef avc_info;
 685     CFDataRef data = NULL;
 686
 687     avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 688                                          1,
 689                                          &kCFTypeDictionaryKeyCallBacks,
 690                                          &kCFTypeDictionaryValueCallBacks);
 691
 692     switch (codec_type) {
 693     case kCMVideoCodecType_MPEG4Video :
 694         if (avctx->extradata_size)
 695             data = videotoolbox_esds_extradata_create(avctx);
 696         if (data)
 697             CFDictionarySetValue(avc_info, CFSTR("esds"), data);
 698         break;
 699     case kCMVideoCodecType_H264 :
 700         data = ff_videotoolbox_avcc_extradata_create(avctx);
 701         if (data)
 702             CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
 703         break;
 704     case kCMVideoCodecType_HEVC :
 705         data = ff_videotoolbox_hvcc_extradata_create(avctx);
 706         if (data)
 707             CFDictionarySetValue(avc_info, CFSTR("hvcC"), data);
 708         break;
 709     default:
 710         break;
 711     }
 712
 713     CFDictionarySetValue(config_info,
 714             kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
 715             avc_info);
 716
 717     if (data)
 718         CFRelease(data);
 719
 720     CFRelease(avc_info);
 721     return config_info;
 722 }
 723
 724 static int videotoolbox_start(AVCodecContext *avctx)
 725 {
 726     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 727     OSStatus status;
 728     VTDecompressionOutputCallbackRecord decoder_cb;
 729     CFDictionaryRef decoder_spec;
 730     CFDictionaryRef buf_attr;
 731
 732     if (!videotoolbox) {
 733         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 734         return -1;
 735     }
 736
 737     switch( avctx->codec_id ) {
 738     case AV_CODEC_ID_H263 :
 739         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 740         break;
 741     case AV_CODEC_ID_H264 :
 742         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 743         break;
 744     case AV_CODEC_ID_HEVC :
 745         videotoolbox->cm_codec_type = kCMVideoCodecType_HEVC;
 746         break;
 747     case AV_CODEC_ID_MPEG1VIDEO :
 748         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 749         break;
 750     case AV_CODEC_ID_MPEG2VIDEO :
 751         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 752         break;
 753     case AV_CODEC_ID_MPEG4 :
 754         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 755         break;
 756     default :
 757         break;
 758     }
 759
 760     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 761
 762     if (!decoder_spec) {
 763         av_log(avctx, AV_LOG_ERROR, "decoder specification creation failed\n");
 764         return -1;
 765     }
 766
 767     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
 768                                                                 decoder_spec,
 769                                                                 avctx->width,
 770                                                                 avctx->height);
 771     if (!videotoolbox->cm_fmt_desc) {
 772         if (decoder_spec)
 773             CFRelease(decoder_spec);
 774
 775         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 776         return -1;
 777     }
 778
 779     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 780                                                      avctx->height,
 781                                                      videotoolbox->cv_pix_fmt_type);
 782
 783     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 784     decoder_cb.decompressionOutputRefCon   = avctx;
 785
 786     status = VTDecompressionSessionCreate(NULL,                      // allocator
 787                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 788                                           decoder_spec,              // videoDecoderSpecification
 789                                           buf_attr,                  // destinationImageBufferAttributes
 790                                           &decoder_cb,               // outputCallback
 791                                           &videotoolbox->session);   // decompressionSessionOut
 792
 793     if (decoder_spec)
 794         CFRelease(decoder_spec);
 795     if (buf_attr)
 796         CFRelease(buf_attr);
 797
 798     switch (status) {
 799     case kVTVideoDecoderNotAvailableNowErr:
 800         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox session not available.\n");
 801         return AVERROR(ENOSYS);
 802     case kVTVideoDecoderUnsupportedDataFormatErr:
 803         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox does not support this format.\n");
 804         return AVERROR(ENOSYS);
 805     case kVTVideoDecoderMalfunctionErr:
 806         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox malfunction.\n");
 807         return AVERROR(EINVAL);
 808     case kVTVideoDecoderBadDataErr:
 809         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox reported invalid data.\n");
 810         return AVERROR_INVALIDDATA;
 811     case 0:
 812         return 0;
 813     default:
 814         av_log(avctx, AV_LOG_VERBOSE, "Unknown VideoToolbox session creation error %u\n", (unsigned)status);
 815         return AVERROR_UNKNOWN;
 816     }
 817 }
 818
 819 static void videotoolbox_stop(AVCodecContext *avctx)
 820 {
 821     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 822     if (!videotoolbox)
 823         return;
 824
 825     if (videotoolbox->cm_fmt_desc) {
 826         CFRelease(videotoolbox->cm_fmt_desc);
 827         videotoolbox->cm_fmt_desc = NULL;
 828     }
 829
 830     if (videotoolbox->session) {
 831         VTDecompressionSessionInvalidate(videotoolbox->session);
 832         CFRelease(videotoolbox->session);
 833         videotoolbox->session = NULL;
 834     }
 835 }
 836
 837 static const char *videotoolbox_error_string(OSStatus status)
 838 {
 839     switch (status) {
 840         case kVTVideoDecoderBadDataErr:
 841             return "bad data";
 842         case kVTVideoDecoderMalfunctionErr:
 843             return "decoder malfunction";
 844         case kVTInvalidSessionErr:
 845             return "invalid session";
 846     }
 847     return "unknown";
 848 }
 849
 850 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
 851 {
 852     OSStatus status;
 853     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 854     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 855
 856     if (vtctx->reconfig_needed == true) {
 857         vtctx->reconfig_needed = false;
 858         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox decoder needs reconfig, restarting..\n");
 859         videotoolbox_stop(avctx);
 860         if (videotoolbox_start(avctx) != 0) {
 861             return AVERROR_EXTERNAL;
 862         }
 863     }
 864
 865     if (!videotoolbox->session || !vtctx->bitstream || !vtctx->bitstream_size)
 866         return AVERROR_INVALIDDATA;
 867
 868     status = videotoolbox_session_decode_frame(avctx);
 869     if (status != noErr) {
 870         if (status == kVTVideoDecoderMalfunctionErr || status == kVTInvalidSessionErr)
 871             vtctx->reconfig_needed = true;
 872         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%s, %d)\n", videotoolbox_error_string(status), (int)status);
 873         return AVERROR_UNKNOWN;
 874     }
 875
 876     if (!vtctx->frame) {
 877         vtctx->reconfig_needed = true;
 878         return AVERROR_UNKNOWN;
 879     }
 880
 881     return videotoolbox_buffer_create(avctx, frame);
 882 }
 883
 884 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
 885 {
 886     H264Context *h = avctx->priv_data;
 887     AVFrame *frame = h->cur_pic_ptr->f;
 888     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 889     int ret = videotoolbox_common_end_frame(avctx, frame);
 890     vtctx->bitstream_size = 0;
 891     return ret;
 892 }
 893
 894 static int videotoolbox_hevc_decode_params(AVCodecContext *avctx,
 895                                            int type,
 896                                            const uint8_t *buffer,
 897                                            uint32_t size)
 898 {
 899     return ff_videotoolbox_h264_decode_slice(avctx, buffer, size);
 900 }
 901
 902 static int videotoolbox_hevc_end_frame(AVCodecContext *avctx)
 903 {
 904     HEVCContext *h = avctx->priv_data;
 905     AVFrame *frame = h->ref->frame;
 906     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 907     int ret;
 908
 909     ret = videotoolbox_common_end_frame(avctx, frame);
 910     vtctx->bitstream_size = 0;
 911     return ret;
 912 }
 913
 914 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
 915                                          const uint8_t *buffer,
 916                                          uint32_t size)
 917 {
 918     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 919
 920     return videotoolbox_buffer_copy(vtctx, buffer, size);
 921 }
 922
 923 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
 924                                           const uint8_t *buffer,
 925                                           uint32_t size)
 926 {
 927     return 0;
 928 }
 929
 930 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
 931 {
 932     MpegEncContext *s = avctx->priv_data;
 933     AVFrame *frame = s->current_picture_ptr->f;
 934
 935     return videotoolbox_common_end_frame(avctx, frame);
 936 }
 937
 938 static int videotoolbox_uninit(AVCodecContext *avctx)
 939 {
 940     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 941     if (!vtctx)
 942         return 0;
 943
 944     ff_videotoolbox_uninit(avctx);
 945
 946     if (vtctx->vt_ctx)
 947         videotoolbox_stop(avctx);
 948
 949     av_buffer_unref(&vtctx->cached_hw_frames_ctx);
 950     av_freep(&vtctx->vt_ctx);
 951
 952     return 0;
 953 }
 954
 955 static int videotoolbox_common_init(AVCodecContext *avctx)
 956 {
 957     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 958     AVHWFramesContext *hw_frames;
 959     int err;
 960
 961     // Old API - do nothing.
 962     if (avctx->hwaccel_context)
 963         return 0;
 964
 965     if (!avctx->hw_frames_ctx && !avctx->hw_device_ctx) {
 966         av_log(avctx, AV_LOG_ERROR,
 967                "Either hw_frames_ctx or hw_device_ctx must be set.\n");
 968         return AVERROR(EINVAL);
 969     }
 970
 971     vtctx->vt_ctx = av_videotoolbox_alloc_context();
 972     if (!vtctx->vt_ctx) {
 973         err = AVERROR(ENOMEM);
 974         goto fail;
 975     }
 976
 977     if (avctx->hw_frames_ctx) {
 978         hw_frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
 979     } else {
 980         avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);
 981         if (!avctx->hw_frames_ctx) {
 982             err = AVERROR(ENOMEM);
 983             goto fail;
 984         }
 985
 986         hw_frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
 987         hw_frames->format = AV_PIX_FMT_VIDEOTOOLBOX;
 988         hw_frames->sw_format = AV_PIX_FMT_NV12; // same as av_videotoolbox_alloc_context()
 989         hw_frames->width = avctx->width;
 990         hw_frames->height = avctx->height;
 991
 992         err = av_hwframe_ctx_init(avctx->hw_frames_ctx);
 993         if (err < 0) {
 994             av_buffer_unref(&avctx->hw_frames_ctx);
 995             goto fail;
 996         }
 997     }
 998
 999     vtctx->cached_hw_frames_ctx = av_buffer_ref(avctx->hw_frames_ctx);
1000     if (!vtctx->cached_hw_frames_ctx) {
1001         err = AVERROR(ENOMEM);
1002         goto fail;
1003     }
1004
1005     vtctx->vt_ctx->cv_pix_fmt_type =
1006         av_map_videotoolbox_format_from_pixfmt(hw_frames->sw_format);
1007     if (!vtctx->vt_ctx->cv_pix_fmt_type) {
1008         av_log(avctx, AV_LOG_ERROR, "Unknown sw_format.\n");
1009         err = AVERROR(EINVAL);
1010         goto fail;
1011     }
1012
1013     err = videotoolbox_start(avctx);
1014     if (err < 0)
1015         goto fail;
1016
1017     return 0;
1018
1019 fail:
1020     videotoolbox_uninit(avctx);
1021     return err;
1022 }
1023
1024 static int videotoolbox_frame_params(AVCodecContext *avctx,
1025                                      AVBufferRef *hw_frames_ctx)
1026 {
1027     AVHWFramesContext *frames_ctx = (AVHWFramesContext*)hw_frames_ctx->data;
1028
1029     frames_ctx->format            = AV_PIX_FMT_VIDEOTOOLBOX;
1030     frames_ctx->width             = avctx->coded_width;
1031     frames_ctx->height            = avctx->coded_height;
1032     frames_ctx->sw_format         = AV_PIX_FMT_NV12;
1033
1034     return 0;
1035 }
1036
1037 const AVHWAccel ff_h263_videotoolbox_hwaccel = {
1038     .name           = "h263_videotoolbox",
1039     .type           = AVMEDIA_TYPE_VIDEO,
1040     .id             = AV_CODEC_ID_H263,
1041     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1042     .alloc_frame    = ff_videotoolbox_alloc_frame,
1043     .start_frame    = videotoolbox_mpeg_start_frame,
1044     .decode_slice   = videotoolbox_mpeg_decode_slice,
1045     .end_frame      = videotoolbox_mpeg_end_frame,
1046     .frame_params   = videotoolbox_frame_params,
1047     .init           = videotoolbox_common_init,
1048     .uninit         = videotoolbox_uninit,
1049     .priv_data_size = sizeof(VTContext),
1050 };
1051
1052 const AVHWAccel ff_hevc_videotoolbox_hwaccel = {
1053     .name           = "hevc_videotoolbox",
1054     .type           = AVMEDIA_TYPE_VIDEO,
1055     .id             = AV_CODEC_ID_HEVC,
1056     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1057     .alloc_frame    = ff_videotoolbox_alloc_frame,
1058     .start_frame    = ff_videotoolbox_h264_start_frame,
1059     .decode_slice   = ff_videotoolbox_h264_decode_slice,
1060     .decode_params  = videotoolbox_hevc_decode_params,
1061     .end_frame      = videotoolbox_hevc_end_frame,
1062     .frame_params   = videotoolbox_frame_params,
1063     .init           = videotoolbox_common_init,
1064     .uninit         = ff_videotoolbox_uninit,
1065     .priv_data_size = sizeof(VTContext),
1066 };
1067
1068 const AVHWAccel ff_h264_videotoolbox_hwaccel = {
1069     .name           = "h264_videotoolbox",
1070     .type           = AVMEDIA_TYPE_VIDEO,
1071     .id             = AV_CODEC_ID_H264,
1072     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1073     .alloc_frame    = ff_videotoolbox_alloc_frame,
1074     .start_frame    = ff_videotoolbox_h264_start_frame,
1075     .decode_slice   = ff_videotoolbox_h264_decode_slice,
1076     .decode_params  = videotoolbox_h264_decode_params,
1077     .end_frame      = videotoolbox_h264_end_frame,
1078     .frame_params   = videotoolbox_frame_params,
1079     .init           = videotoolbox_common_init,
1080     .uninit         = videotoolbox_uninit,
1081     .priv_data_size = sizeof(VTContext),
1082 };
1083
1084 const AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
1085     .name           = "mpeg1_videotoolbox",
1086     .type           = AVMEDIA_TYPE_VIDEO,
1087     .id             = AV_CODEC_ID_MPEG1VIDEO,
1088     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1089     .alloc_frame    = ff_videotoolbox_alloc_frame,
1090     .start_frame    = videotoolbox_mpeg_start_frame,
1091     .decode_slice   = videotoolbox_mpeg_decode_slice,
1092     .end_frame      = videotoolbox_mpeg_end_frame,
1093     .frame_params   = videotoolbox_frame_params,
1094     .init           = videotoolbox_common_init,
1095     .uninit         = videotoolbox_uninit,
1096     .priv_data_size = sizeof(VTContext),
1097 };
1098
1099 const AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
1100     .name           = "mpeg2_videotoolbox",
1101     .type           = AVMEDIA_TYPE_VIDEO,
1102     .id             = AV_CODEC_ID_MPEG2VIDEO,
1103     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1104     .alloc_frame    = ff_videotoolbox_alloc_frame,
1105     .start_frame    = videotoolbox_mpeg_start_frame,
1106     .decode_slice   = videotoolbox_mpeg_decode_slice,
1107     .end_frame      = videotoolbox_mpeg_end_frame,
1108     .frame_params   = videotoolbox_frame_params,
1109     .init           = videotoolbox_common_init,
1110     .uninit         = videotoolbox_uninit,
1111     .priv_data_size = sizeof(VTContext),
1112 };
1113
1114 const AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
1115     .name           = "mpeg4_videotoolbox",
1116     .type           = AVMEDIA_TYPE_VIDEO,
1117     .id             = AV_CODEC_ID_MPEG4,
1118     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1119     .alloc_frame    = ff_videotoolbox_alloc_frame,
1120     .start_frame    = videotoolbox_mpeg_start_frame,
1121     .decode_slice   = videotoolbox_mpeg_decode_slice,
1122     .end_frame      = videotoolbox_mpeg_end_frame,
1123     .frame_params   = videotoolbox_frame_params,
1124     .init           = videotoolbox_common_init,
1125     .uninit         = videotoolbox_uninit,
1126     .priv_data_size = sizeof(VTContext),
1127 };
1128
1129 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
1130 {
1131     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
1132
1133     if (ret) {
1134         ret->output_callback = videotoolbox_decoder_callback;
1135         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
1136     }
1137
1138     return ret;
1139 }
1140
1141 int av_videotoolbox_default_init(AVCodecContext *avctx)
1142 {
1143     return av_videotoolbox_default_init2(avctx, NULL);
1144 }
1145
1146 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
1147 {
1148     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
1149     if (!avctx->hwaccel_context)
1150         return AVERROR(ENOMEM);
1151     return videotoolbox_start(avctx);
1152 }
1153
1154 void av_videotoolbox_default_free(AVCodecContext *avctx)
1155 {
1156
1157     videotoolbox_stop(avctx);
1158     av_freep(&avctx->hwaccel_context);
1159 }
1160 #endif /* CONFIG_VIDEOTOOLBOX */