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 #ifndef kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
  40 #  define kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder CFSTR("EnableHardwareAcceleratedVideoDecoder")
  41 #endif
  42
  43 #if !HAVE_KCMVIDEOCODECTYPE_HEVC
  44 enum { kCMVideoCodecType_HEVC = 'hvc1' };
  45 #endif
  46
  47 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
  48
  49 typedef struct VTHWFrame {
  50     CVPixelBufferRef pixbuf;
  51     AVBufferRef *hw_frames_ctx;
  52 } VTHWFrame;
  53
  54 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
  55 {
  56     VTHWFrame *ref = (VTHWFrame *)data;
  57     av_buffer_unref(&ref->hw_frames_ctx);
  58     CVPixelBufferRelease(ref->pixbuf);
  59
  60     av_free(data);
  61 }
  62
  63 static int videotoolbox_buffer_copy(VTContext *vtctx,
  64                                     const uint8_t *buffer,
  65                                     uint32_t size)
  66 {
  67     void *tmp;
  68
  69     tmp = av_fast_realloc(vtctx->bitstream,
  70                          &vtctx->allocated_size,
  71                          size);
  72
  73     if (!tmp)
  74         return AVERROR(ENOMEM);
  75
  76     vtctx->bitstream = tmp;
  77     memcpy(vtctx->bitstream, buffer, size);
  78     vtctx->bitstream_size = size;
  79
  80     return 0;
  81 }
  82
  83 static int videotoolbox_postproc_frame(void *avctx, AVFrame *frame)
  84 {
  85     VTHWFrame *ref = (VTHWFrame *)frame->buf[0]->data;
  86
  87     if (!ref->pixbuf) {
  88         av_log(avctx, AV_LOG_ERROR, "No frame decoded?\n");
  89         av_frame_unref(frame);
  90         return AVERROR_EXTERNAL;
  91     }
  92
  93     frame->data[3] = (uint8_t*)ref->pixbuf;
  94
  95     if (ref->hw_frames_ctx) {
  96         av_buffer_unref(&frame->hw_frames_ctx);
  97         frame->hw_frames_ctx = av_buffer_ref(ref->hw_frames_ctx);
  98         if (!frame->hw_frames_ctx)
  99             return AVERROR(ENOMEM);
 100     }
 101
 102     return 0;
 103 }
 104
 105 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
 106 {
 107     size_t      size = sizeof(VTHWFrame);
 108     uint8_t    *data = NULL;
 109     AVBufferRef *buf = NULL;
 110     int ret = ff_attach_decode_data(frame);
 111     FrameDecodeData *fdd;
 112     if (ret < 0)
 113         return ret;
 114
 115     data = av_mallocz(size);
 116     if (!data)
 117         return AVERROR(ENOMEM);
 118     buf = av_buffer_create(data, size, videotoolbox_buffer_release, NULL, 0);
 119     if (!buf) {
 120         av_freep(&data);
 121         return AVERROR(ENOMEM);
 122     }
 123     frame->buf[0] = buf;
 124
 125     fdd = (FrameDecodeData*)frame->private_ref->data;
 126     fdd->post_process = videotoolbox_postproc_frame;
 127
 128     frame->width  = avctx->width;
 129     frame->height = avctx->height;
 130     frame->format = avctx->pix_fmt;
 131
 132     return 0;
 133 }
 134
 135 #define AV_W8(p, v) *(p) = (v)
 136
 137 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
 138 {
 139     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 140     H264Context *h = avctx->priv_data;
 141     CFDataRef data = NULL;
 142     uint8_t *p;
 143     int vt_extradata_size = 6 + 2 + h->ps.sps->data_size + 3 + h->ps.pps->data_size;
 144     uint8_t *vt_extradata = av_malloc(vt_extradata_size);
 145     if (!vt_extradata)
 146         return NULL;
 147
 148     p = vt_extradata;
 149
 150     AV_W8(p + 0, 1); /* version */
 151     AV_W8(p + 1, h->ps.sps->data[1]); /* profile */
 152     AV_W8(p + 2, h->ps.sps->data[2]); /* profile compat */
 153     AV_W8(p + 3, h->ps.sps->data[3]); /* level */
 154     AV_W8(p + 4, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 3 (11) */
 155     AV_W8(p + 5, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
 156     AV_WB16(p + 6, h->ps.sps->data_size);
 157     memcpy(p + 8, h->ps.sps->data, h->ps.sps->data_size);
 158     p += 8 + h->ps.sps->data_size;
 159     AV_W8(p + 0, 1); /* number of pps */
 160     AV_WB16(p + 1, h->ps.pps->data_size);
 161     memcpy(p + 3, h->ps.pps->data, h->ps.pps->data_size);
 162
 163     p += 3 + h->ps.pps->data_size;
 164     av_assert0(p - vt_extradata == vt_extradata_size);
 165
 166     // save sps header (profile/level) used to create decoder session,
 167     // so we can detect changes and recreate it.
 168     if (vtctx)
 169         memcpy(vtctx->sps, h->ps.sps->data + 1, 3);
 170
 171     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 172     av_free(vt_extradata);
 173     return data;
 174 }
 175
 176 CFDataRef ff_videotoolbox_hvcc_extradata_create(AVCodecContext *avctx)
 177 {
 178     HEVCContext *h = avctx->priv_data;
 179     int i, num_vps = 0, num_sps = 0, num_pps = 0;
 180     const HEVCVPS *vps = h->ps.vps;
 181     const HEVCSPS *sps = h->ps.sps;
 182     const HEVCPPS *pps = h->ps.pps;
 183     PTLCommon ptlc = vps->ptl.general_ptl;
 184     VUI vui = sps->vui;
 185     uint8_t parallelismType;
 186     CFDataRef data = NULL;
 187     uint8_t *p;
 188     int vt_extradata_size = 23 + 3 + 3 + 3;
 189     uint8_t *vt_extradata;
 190
 191 #define COUNT_SIZE_PS(T, t) \
 192     for (i = 0; i < HEVC_MAX_##T##PS_COUNT; i++) { \
 193         if (h->ps.t##ps_list[i]) { \
 194             const HEVC##T##PS *lps = (const HEVC##T##PS *)h->ps.t##ps_list[i]->data; \
 195             vt_extradata_size += 2 + lps->data_size; \
 196             num_##t##ps++; \
 197         } \
 198     }
 199
 200     COUNT_SIZE_PS(V, v)
 201     COUNT_SIZE_PS(S, s)
 202     COUNT_SIZE_PS(P, p)
 203
 204     vt_extradata = av_malloc(vt_extradata_size);
 205     if (!vt_extradata)
 206         return NULL;
 207     p = vt_extradata;
 208
 209     /* unsigned int(8) configurationVersion = 1; */
 210     AV_W8(p + 0, 1);
 211
 212     /*
 213      * unsigned int(2) general_profile_space;
 214      * unsigned int(1) general_tier_flag;
 215      * unsigned int(5) general_profile_idc;
 216      */
 217     AV_W8(p + 1, ptlc.profile_space << 6 |
 218                  ptlc.tier_flag     << 5 |
 219                  ptlc.profile_idc);
 220
 221     /* unsigned int(32) general_profile_compatibility_flags; */
 222     memcpy(p + 2, ptlc.profile_compatibility_flag, 4);
 223
 224     /* unsigned int(48) general_constraint_indicator_flags; */
 225     AV_W8(p + 6, ptlc.progressive_source_flag    << 7 |
 226                  ptlc.interlaced_source_flag     << 6 |
 227                  ptlc.non_packed_constraint_flag << 5 |
 228                  ptlc.frame_only_constraint_flag << 4);
 229     AV_W8(p + 7, 0);
 230     AV_WN32(p + 8, 0);
 231
 232     /* unsigned int(8) general_level_idc; */
 233     AV_W8(p + 12, ptlc.level_idc);
 234
 235     /*
 236      * bit(4) reserved = ‘1111’b;
 237      * unsigned int(12) min_spatial_segmentation_idc;
 238      */
 239     AV_W8(p + 13, 0xf0 | (vui.min_spatial_segmentation_idc >> 4));
 240     AV_W8(p + 14, vui.min_spatial_segmentation_idc & 0xff);
 241
 242     /*
 243      * bit(6) reserved = ‘111111’b;
 244      * unsigned int(2) parallelismType;
 245      */
 246     if (!vui.min_spatial_segmentation_idc)
 247         parallelismType = 0;
 248     else if (pps->entropy_coding_sync_enabled_flag && pps->tiles_enabled_flag)
 249         parallelismType = 0;
 250     else if (pps->entropy_coding_sync_enabled_flag)
 251         parallelismType = 3;
 252     else if (pps->tiles_enabled_flag)
 253         parallelismType = 2;
 254     else
 255         parallelismType = 1;
 256     AV_W8(p + 15, 0xfc | parallelismType);
 257
 258     /*
 259      * bit(6) reserved = ‘111111’b;
 260      * unsigned int(2) chromaFormat;
 261      */
 262     AV_W8(p + 16, sps->chroma_format_idc | 0xfc);
 263
 264     /*
 265      * bit(5) reserved = ‘11111’b;
 266      * unsigned int(3) bitDepthLumaMinus8;
 267      */
 268     AV_W8(p + 17, (sps->bit_depth - 8) | 0xfc);
 269
 270     /*
 271      * bit(5) reserved = ‘11111’b;
 272      * unsigned int(3) bitDepthChromaMinus8;
 273      */
 274     AV_W8(p + 18, (sps->bit_depth_chroma - 8) | 0xfc);
 275
 276     /* bit(16) avgFrameRate; */
 277     AV_WB16(p + 19, 0);
 278
 279     /*
 280      * bit(2) constantFrameRate;
 281      * bit(3) numTemporalLayers;
 282      * bit(1) temporalIdNested;
 283      * unsigned int(2) lengthSizeMinusOne;
 284      */
 285     AV_W8(p + 21, 0                             << 6 |
 286                   sps->max_sub_layers           << 3 |
 287                   sps->temporal_id_nesting_flag << 2 |
 288                   3);
 289
 290     /* unsigned int(8) numOfArrays; */
 291     AV_W8(p + 22, 3);
 292
 293     p += 23;
 294
 295 #define APPEND_PS(T, t) \
 296     /* \
 297      * bit(1) array_completeness; \
 298      * unsigned int(1) reserved = 0; \
 299      * unsigned int(6) NAL_unit_type; \
 300      */ \
 301     AV_W8(p, 1 << 7 | \
 302              HEVC_NAL_##T##PS & 0x3f); \
 303     /* unsigned int(16) numNalus; */ \
 304     AV_WB16(p + 1, num_##t##ps); \
 305     p += 3; \
 306     for (i = 0; i < HEVC_MAX_##T##PS_COUNT; i++) { \
 307         if (h->ps.t##ps_list[i]) { \
 308             const HEVC##T##PS *lps = (const HEVC##T##PS *)h->ps.t##ps_list[i]->data; \
 309             /* unsigned int(16) nalUnitLength; */ \
 310             AV_WB16(p, lps->data_size); \
 311             /* bit(8*nalUnitLength) nalUnit; */ \
 312             memcpy(p + 2, lps->data, lps->data_size); \
 313             p += 2 + lps->data_size; \
 314         } \
 315     }
 316
 317     APPEND_PS(V, v)
 318     APPEND_PS(S, s)
 319     APPEND_PS(P, p)
 320
 321     av_assert0(p - vt_extradata == vt_extradata_size);
 322
 323     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 324     av_free(vt_extradata);
 325     return data;
 326 }
 327
 328 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
 329                                      const uint8_t *buffer,
 330                                      uint32_t size)
 331 {
 332     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 333     H264Context *h = avctx->priv_data;
 334
 335     if (h->is_avc == 1) {
 336         return videotoolbox_buffer_copy(vtctx, buffer, size);
 337     }
 338
 339     return 0;
 340 }
 341
 342 static int videotoolbox_h264_decode_params(AVCodecContext *avctx,
 343                                            int type,
 344                                            const uint8_t *buffer,
 345                                            uint32_t size)
 346 {
 347     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 348     H264Context *h = avctx->priv_data;
 349
 350     // save sps header (profile/level) used to create decoder session
 351     if (!vtctx->sps[0])
 352         memcpy(vtctx->sps, h->ps.sps->data + 1, 3);
 353
 354     if (type == H264_NAL_SPS) {
 355         if (size > 4 && memcmp(vtctx->sps, buffer + 1, 3) != 0) {
 356             vtctx->reconfig_needed = true;
 357             memcpy(vtctx->sps, buffer + 1, 3);
 358         }
 359     }
 360
 361     // pass-through SPS/PPS changes to the decoder
 362     return ff_videotoolbox_h264_decode_slice(avctx, buffer, size);
 363 }
 364
 365 static int videotoolbox_common_decode_slice(AVCodecContext *avctx,
 366                                             const uint8_t *buffer,
 367                                             uint32_t size)
 368 {
 369     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 370     void *tmp;
 371
 372     tmp = av_fast_realloc(vtctx->bitstream,
 373                           &vtctx->allocated_size,
 374                           vtctx->bitstream_size+size+4);
 375     if (!tmp)
 376         return AVERROR(ENOMEM);
 377
 378     vtctx->bitstream = tmp;
 379
 380     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
 381     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
 382
 383     vtctx->bitstream_size += size + 4;
 384
 385     return 0;
 386 }
 387
 388 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
 389                                       const uint8_t *buffer,
 390                                       uint32_t size)
 391 {
 392     H264Context *h = avctx->priv_data;
 393
 394     if (h->is_avc == 1)
 395         return 0;
 396
 397     return videotoolbox_common_decode_slice(avctx, buffer, size);
 398 }
 399
 400 int ff_videotoolbox_uninit(AVCodecContext *avctx)
 401 {
 402     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 403     if (vtctx) {
 404         av_freep(&vtctx->bitstream);
 405         if (vtctx->frame)
 406             CVPixelBufferRelease(vtctx->frame);
 407     }
 408
 409     return 0;
 410 }
 411
 412 #if CONFIG_VIDEOTOOLBOX
 413 // Return the AVVideotoolboxContext that matters currently. Where it comes from
 414 // depends on the API used.
 415 static AVVideotoolboxContext *videotoolbox_get_context(AVCodecContext *avctx)
 416 {
 417     // Somewhat tricky because the user can call av_videotoolbox_default_free()
 418     // at any time, even when the codec is closed.
 419     if (avctx->internal && avctx->internal->hwaccel_priv_data) {
 420         VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 421         if (vtctx->vt_ctx)
 422             return vtctx->vt_ctx;
 423     }
 424     return avctx->hwaccel_context;
 425 }
 426
 427 static int videotoolbox_buffer_create(AVCodecContext *avctx, AVFrame *frame)
 428 {
 429     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 430     CVPixelBufferRef pixbuf = (CVPixelBufferRef)vtctx->frame;
 431     OSType pixel_format = CVPixelBufferGetPixelFormatType(pixbuf);
 432     enum AVPixelFormat sw_format = av_map_videotoolbox_format_to_pixfmt(pixel_format);
 433     int width = CVPixelBufferGetWidth(pixbuf);
 434     int height = CVPixelBufferGetHeight(pixbuf);
 435     AVHWFramesContext *cached_frames;
 436     VTHWFrame *ref;
 437     int ret;
 438
 439     if (!frame->buf[0] || frame->data[3]) {
 440         av_log(avctx, AV_LOG_ERROR, "videotoolbox: invalid state\n");
 441         av_frame_unref(frame);
 442         return AVERROR_EXTERNAL;
 443     }
 444
 445     ref = (VTHWFrame *)frame->buf[0]->data;
 446
 447     if (ref->pixbuf)
 448         CVPixelBufferRelease(ref->pixbuf);
 449     ref->pixbuf = vtctx->frame;
 450     vtctx->frame = NULL;
 451
 452     // Old API code path.
 453     if (!vtctx->cached_hw_frames_ctx)
 454         return 0;
 455
 456     cached_frames = (AVHWFramesContext*)vtctx->cached_hw_frames_ctx->data;
 457
 458     if (cached_frames->sw_format != sw_format ||
 459         cached_frames->width != width ||
 460         cached_frames->height != height) {
 461         AVBufferRef *hw_frames_ctx = av_hwframe_ctx_alloc(cached_frames->device_ref);
 462         AVHWFramesContext *hw_frames;
 463         if (!hw_frames_ctx)
 464             return AVERROR(ENOMEM);
 465
 466         hw_frames = (AVHWFramesContext*)hw_frames_ctx->data;
 467         hw_frames->format = cached_frames->format;
 468         hw_frames->sw_format = sw_format;
 469         hw_frames->width = width;
 470         hw_frames->height = height;
 471
 472         ret = av_hwframe_ctx_init(hw_frames_ctx);
 473         if (ret < 0) {
 474             av_buffer_unref(&hw_frames_ctx);
 475             return ret;
 476         }
 477
 478         av_buffer_unref(&vtctx->cached_hw_frames_ctx);
 479         vtctx->cached_hw_frames_ctx = hw_frames_ctx;
 480     }
 481
 482     av_buffer_unref(&ref->hw_frames_ctx);
 483     ref->hw_frames_ctx = av_buffer_ref(vtctx->cached_hw_frames_ctx);
 484     if (!ref->hw_frames_ctx)
 485         return AVERROR(ENOMEM);
 486
 487     return 0;
 488 }
 489
 490 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
 491 {
 492     int i;
 493     uint8_t b;
 494
 495     for (i = 3; i >= 0; i--) {
 496         b = (length >> (i * 7)) & 0x7F;
 497         if (i != 0)
 498             b |= 0x80;
 499
 500         bytestream2_put_byteu(pb, b);
 501     }
 502 }
 503
 504 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
 505 {
 506     CFDataRef data;
 507     uint8_t *rw_extradata;
 508     PutByteContext pb;
 509     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
 510     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
 511     int config_size = 13 + 5 + avctx->extradata_size;
 512     int s;
 513
 514     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
 515         return NULL;
 516
 517     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
 518     bytestream2_put_byteu(&pb, 0);        // version
 519     bytestream2_put_ne24(&pb, 0);         // flags
 520
 521     // elementary stream descriptor
 522     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
 523     videotoolbox_write_mp4_descr_length(&pb, full_size);
 524     bytestream2_put_ne16(&pb, 0);         // esid
 525     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
 526
 527     // decoder configuration descriptor
 528     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
 529     videotoolbox_write_mp4_descr_length(&pb, config_size);
 530     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
 531     bytestream2_put_byteu(&pb, 0x11);     // stream type
 532     bytestream2_put_ne24(&pb, 0);         // buffer size
 533     bytestream2_put_ne32(&pb, 0);         // max bitrate
 534     bytestream2_put_ne32(&pb, 0);         // avg bitrate
 535
 536     // decoder specific descriptor
 537     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
 538     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
 539
 540     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
 541
 542     // SLConfigDescriptor
 543     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
 544     bytestream2_put_byteu(&pb, 0x01);     // length
 545     bytestream2_put_byteu(&pb, 0x02);     //
 546
 547     s = bytestream2_size_p(&pb);
 548
 549     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
 550
 551     av_freep(&rw_extradata);
 552     return data;
 553 }
 554
 555 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
 556                                                            void *buffer,
 557                                                            int size)
 558 {
 559     OSStatus status;
 560     CMBlockBufferRef  block_buf;
 561     CMSampleBufferRef sample_buf;
 562
 563     block_buf  = NULL;
 564     sample_buf = NULL;
 565
 566     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
 567                                                 buffer,             // memoryBlock
 568                                                 size,               // blockLength
 569                                                 kCFAllocatorNull,   // blockAllocator
 570                                                 NULL,               // customBlockSource
 571                                                 0,                  // offsetToData
 572                                                 size,               // dataLength
 573                                                 0,                  // flags
 574                                                 &block_buf);
 575
 576     if (!status) {
 577         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
 578                                       block_buf,            // dataBuffer
 579                                       TRUE,                 // dataReady
 580                                       0,                    // makeDataReadyCallback
 581                                       0,                    // makeDataReadyRefcon
 582                                       fmt_desc,             // formatDescription
 583                                       1,                    // numSamples
 584                                       0,                    // numSampleTimingEntries
 585                                       NULL,                 // sampleTimingArray
 586                                       0,                    // numSampleSizeEntries
 587                                       NULL,                 // sampleSizeArray
 588                                       &sample_buf);
 589     }
 590
 591     if (block_buf)
 592         CFRelease(block_buf);
 593
 594     return sample_buf;
 595 }
 596
 597 static void videotoolbox_decoder_callback(void *opaque,
 598                                           void *sourceFrameRefCon,
 599                                           OSStatus status,
 600                                           VTDecodeInfoFlags flags,
 601                                           CVImageBufferRef image_buffer,
 602                                           CMTime pts,
 603                                           CMTime duration)
 604 {
 605     AVCodecContext *avctx = opaque;
 606     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 607
 608     if (vtctx->frame) {
 609         CVPixelBufferRelease(vtctx->frame);
 610         vtctx->frame = NULL;
 611     }
 612
 613     if (!image_buffer) {
 614         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
 615         return;
 616     }
 617
 618     vtctx->frame = CVPixelBufferRetain(image_buffer);
 619 }
 620
 621 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
 622 {
 623     OSStatus status;
 624     CMSampleBufferRef sample_buf;
 625     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 626     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 627
 628     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
 629                                                    vtctx->bitstream,
 630                                                    vtctx->bitstream_size);
 631
 632     if (!sample_buf)
 633         return -1;
 634
 635     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
 636                                                sample_buf,
 637                                                0,       // decodeFlags
 638                                                NULL,    // sourceFrameRefCon
 639                                                0);      // infoFlagsOut
 640     if (status == noErr)
 641         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
 642
 643     CFRelease(sample_buf);
 644
 645     return status;
 646 }
 647
 648 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
 649                                                                    CFDictionaryRef decoder_spec,
 650                                                                    int width,
 651                                                                    int height)
 652 {
 653     CMFormatDescriptionRef cm_fmt_desc;
 654     OSStatus status;
 655
 656     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 657                                             codec_type,
 658                                             width,
 659                                             height,
 660                                             decoder_spec, // Dictionary of extension
 661                                             &cm_fmt_desc);
 662
 663     if (status)
 664         return NULL;
 665
 666     return cm_fmt_desc;
 667 }
 668
 669 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
 670                                                              int height,
 671                                                              OSType pix_fmt)
 672 {
 673     CFMutableDictionaryRef buffer_attributes;
 674     CFMutableDictionaryRef io_surface_properties;
 675     CFNumberRef cv_pix_fmt;
 676     CFNumberRef w;
 677     CFNumberRef h;
 678
 679     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
 680     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
 681     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
 682
 683     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 684                                                   4,
 685                                                   &kCFTypeDictionaryKeyCallBacks,
 686                                                   &kCFTypeDictionaryValueCallBacks);
 687     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 688                                                       0,
 689                                                       &kCFTypeDictionaryKeyCallBacks,
 690                                                       &kCFTypeDictionaryValueCallBacks);
 691
 692     if (pix_fmt)
 693         CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
 694     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
 695     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
 696     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
 697 #if TARGET_OS_IPHONE
 698     CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
 699 #else
 700     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
 701 #endif
 702
 703     CFRelease(io_surface_properties);
 704     CFRelease(cv_pix_fmt);
 705     CFRelease(w);
 706     CFRelease(h);
 707
 708     return buffer_attributes;
 709 }
 710
 711 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
 712                                                           AVCodecContext *avctx)
 713 {
 714     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 715                                                                    0,
 716                                                                    &kCFTypeDictionaryKeyCallBacks,
 717                                                                    &kCFTypeDictionaryValueCallBacks);
 718
 719     CFDictionarySetValue(config_info,
 720                          codec_type == kCMVideoCodecType_HEVC ?
 721                             kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder :
 722                             kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
 723                          kCFBooleanTrue);
 724
 725     CFMutableDictionaryRef avc_info;
 726     CFDataRef data = NULL;
 727
 728     avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 729                                          1,
 730                                          &kCFTypeDictionaryKeyCallBacks,
 731                                          &kCFTypeDictionaryValueCallBacks);
 732
 733     switch (codec_type) {
 734     case kCMVideoCodecType_MPEG4Video :
 735         if (avctx->extradata_size)
 736             data = videotoolbox_esds_extradata_create(avctx);
 737         if (data)
 738             CFDictionarySetValue(avc_info, CFSTR("esds"), data);
 739         break;
 740     case kCMVideoCodecType_H264 :
 741         data = ff_videotoolbox_avcc_extradata_create(avctx);
 742         if (data)
 743             CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
 744         break;
 745     case kCMVideoCodecType_HEVC :
 746         data = ff_videotoolbox_hvcc_extradata_create(avctx);
 747         if (data)
 748             CFDictionarySetValue(avc_info, CFSTR("hvcC"), data);
 749         break;
 750     default:
 751         break;
 752     }
 753
 754     CFDictionarySetValue(config_info,
 755             kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
 756             avc_info);
 757
 758     if (data)
 759         CFRelease(data);
 760
 761     CFRelease(avc_info);
 762     return config_info;
 763 }
 764
 765 static int videotoolbox_start(AVCodecContext *avctx)
 766 {
 767     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 768     OSStatus status;
 769     VTDecompressionOutputCallbackRecord decoder_cb;
 770     CFDictionaryRef decoder_spec;
 771     CFDictionaryRef buf_attr;
 772
 773     if (!videotoolbox) {
 774         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 775         return -1;
 776     }
 777
 778     switch( avctx->codec_id ) {
 779     case AV_CODEC_ID_H263 :
 780         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 781         break;
 782     case AV_CODEC_ID_H264 :
 783         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 784         break;
 785     case AV_CODEC_ID_HEVC :
 786         videotoolbox->cm_codec_type = kCMVideoCodecType_HEVC;
 787         break;
 788     case AV_CODEC_ID_MPEG1VIDEO :
 789         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 790         break;
 791     case AV_CODEC_ID_MPEG2VIDEO :
 792         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 793         break;
 794     case AV_CODEC_ID_MPEG4 :
 795         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 796         break;
 797     default :
 798         break;
 799     }
 800
 801     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 802
 803     if (!decoder_spec) {
 804         av_log(avctx, AV_LOG_ERROR, "decoder specification creation failed\n");
 805         return -1;
 806     }
 807
 808     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
 809                                                                 decoder_spec,
 810                                                                 avctx->width,
 811                                                                 avctx->height);
 812     if (!videotoolbox->cm_fmt_desc) {
 813         if (decoder_spec)
 814             CFRelease(decoder_spec);
 815
 816         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 817         return -1;
 818     }
 819
 820     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 821                                                      avctx->height,
 822                                                      videotoolbox->cv_pix_fmt_type);
 823
 824     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 825     decoder_cb.decompressionOutputRefCon   = avctx;
 826
 827     status = VTDecompressionSessionCreate(NULL,                      // allocator
 828                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 829                                           decoder_spec,              // videoDecoderSpecification
 830                                           buf_attr,                  // destinationImageBufferAttributes
 831                                           &decoder_cb,               // outputCallback
 832                                           &videotoolbox->session);   // decompressionSessionOut
 833
 834     if (decoder_spec)
 835         CFRelease(decoder_spec);
 836     if (buf_attr)
 837         CFRelease(buf_attr);
 838
 839     switch (status) {
 840     case kVTVideoDecoderNotAvailableNowErr:
 841         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox session not available.\n");
 842         return AVERROR(ENOSYS);
 843     case kVTVideoDecoderUnsupportedDataFormatErr:
 844         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox does not support this format.\n");
 845         return AVERROR(ENOSYS);
 846     case kVTCouldNotFindVideoDecoderErr:
 847         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox decoder for this format not found.\n");
 848         return AVERROR(ENOSYS);
 849     case kVTVideoDecoderMalfunctionErr:
 850         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox malfunction.\n");
 851         return AVERROR(EINVAL);
 852     case kVTVideoDecoderBadDataErr:
 853         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox reported invalid data.\n");
 854         return AVERROR_INVALIDDATA;
 855     case 0:
 856         return 0;
 857     default:
 858         av_log(avctx, AV_LOG_VERBOSE, "Unknown VideoToolbox session creation error %d\n", (int)status);
 859         return AVERROR_UNKNOWN;
 860     }
 861 }
 862
 863 static void videotoolbox_stop(AVCodecContext *avctx)
 864 {
 865     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 866     if (!videotoolbox)
 867         return;
 868
 869     if (videotoolbox->cm_fmt_desc) {
 870         CFRelease(videotoolbox->cm_fmt_desc);
 871         videotoolbox->cm_fmt_desc = NULL;
 872     }
 873
 874     if (videotoolbox->session) {
 875         VTDecompressionSessionInvalidate(videotoolbox->session);
 876         CFRelease(videotoolbox->session);
 877         videotoolbox->session = NULL;
 878     }
 879 }
 880
 881 static const char *videotoolbox_error_string(OSStatus status)
 882 {
 883     switch (status) {
 884         case kVTVideoDecoderBadDataErr:
 885             return "bad data";
 886         case kVTVideoDecoderMalfunctionErr:
 887             return "decoder malfunction";
 888         case kVTInvalidSessionErr:
 889             return "invalid session";
 890     }
 891     return "unknown";
 892 }
 893
 894 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
 895 {
 896     OSStatus status;
 897     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 898     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 899
 900     frame->crop_right = 0;
 901     frame->crop_left = 0;
 902     frame->crop_top = 0;
 903     frame->crop_bottom = 0;
 904
 905     if (vtctx->reconfig_needed == true) {
 906         vtctx->reconfig_needed = false;
 907         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox decoder needs reconfig, restarting..\n");
 908         videotoolbox_stop(avctx);
 909         if (videotoolbox_start(avctx) != 0) {
 910             return AVERROR_EXTERNAL;
 911         }
 912     }
 913
 914     if (!videotoolbox->session || !vtctx->bitstream || !vtctx->bitstream_size)
 915         return AVERROR_INVALIDDATA;
 916
 917     status = videotoolbox_session_decode_frame(avctx);
 918     if (status != noErr) {
 919         if (status == kVTVideoDecoderMalfunctionErr || status == kVTInvalidSessionErr)
 920             vtctx->reconfig_needed = true;
 921         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%s, %d)\n", videotoolbox_error_string(status), (int)status);
 922         return AVERROR_UNKNOWN;
 923     }
 924
 925     if (!vtctx->frame) {
 926         vtctx->reconfig_needed = true;
 927         return AVERROR_UNKNOWN;
 928     }
 929
 930     return videotoolbox_buffer_create(avctx, frame);
 931 }
 932
 933 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
 934 {
 935     H264Context *h = avctx->priv_data;
 936     AVFrame *frame = h->cur_pic_ptr->f;
 937     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 938     int ret = videotoolbox_common_end_frame(avctx, frame);
 939     vtctx->bitstream_size = 0;
 940     return ret;
 941 }
 942
 943 static int videotoolbox_hevc_start_frame(AVCodecContext *avctx,
 944                                          const uint8_t *buffer,
 945                                          uint32_t size)
 946 {
 947     return 0;
 948 }
 949
 950 static int videotoolbox_hevc_decode_slice(AVCodecContext *avctx,
 951                                           const uint8_t *buffer,
 952                                           uint32_t size)
 953 {
 954     return videotoolbox_common_decode_slice(avctx, buffer, size);
 955 }
 956
 957
 958 static int videotoolbox_hevc_decode_params(AVCodecContext *avctx,
 959                                            int type,
 960                                            const uint8_t *buffer,
 961                                            uint32_t size)
 962 {
 963     return videotoolbox_common_decode_slice(avctx, buffer, size);
 964 }
 965
 966 static int videotoolbox_hevc_end_frame(AVCodecContext *avctx)
 967 {
 968     HEVCContext *h = avctx->priv_data;
 969     AVFrame *frame = h->ref->frame;
 970     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 971
 972     h->output_frame->crop_right = 0;
 973     h->output_frame->crop_left = 0;
 974     h->output_frame->crop_top = 0;
 975     h->output_frame->crop_bottom = 0;
 976
 977     int ret = videotoolbox_common_end_frame(avctx, frame);
 978     vtctx->bitstream_size = 0;
 979     return ret;
 980 }
 981
 982 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
 983                                          const uint8_t *buffer,
 984                                          uint32_t size)
 985 {
 986     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 987
 988     return videotoolbox_buffer_copy(vtctx, buffer, size);
 989 }
 990
 991 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
 992                                           const uint8_t *buffer,
 993                                           uint32_t size)
 994 {
 995     return 0;
 996 }
 997
 998 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
 999 {
1000     MpegEncContext *s = avctx->priv_data;
1001     AVFrame *frame = s->current_picture_ptr->f;
1002
1003     return videotoolbox_common_end_frame(avctx, frame);
1004 }
1005
1006 static int videotoolbox_uninit(AVCodecContext *avctx)
1007 {
1008     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
1009     if (!vtctx)
1010         return 0;
1011
1012     ff_videotoolbox_uninit(avctx);
1013
1014     if (vtctx->vt_ctx)
1015         videotoolbox_stop(avctx);
1016
1017     av_buffer_unref(&vtctx->cached_hw_frames_ctx);
1018     av_freep(&vtctx->vt_ctx);
1019
1020     return 0;
1021 }
1022
1023 static int videotoolbox_common_init(AVCodecContext *avctx)
1024 {
1025     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
1026     AVHWFramesContext *hw_frames;
1027     int err;
1028
1029     // Old API - do nothing.
1030     if (avctx->hwaccel_context)
1031         return 0;
1032
1033     if (!avctx->hw_frames_ctx && !avctx->hw_device_ctx) {
1034         av_log(avctx, AV_LOG_ERROR,
1035                "Either hw_frames_ctx or hw_device_ctx must be set.\n");
1036         return AVERROR(EINVAL);
1037     }
1038
1039     vtctx->vt_ctx = av_videotoolbox_alloc_context();
1040     if (!vtctx->vt_ctx) {
1041         err = AVERROR(ENOMEM);
1042         goto fail;
1043     }
1044
1045     if (avctx->hw_frames_ctx) {
1046         hw_frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
1047     } else {
1048         avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);
1049         if (!avctx->hw_frames_ctx) {
1050             err = AVERROR(ENOMEM);
1051             goto fail;
1052         }
1053
1054         hw_frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
1055         hw_frames->format = AV_PIX_FMT_VIDEOTOOLBOX;
1056         hw_frames->sw_format = AV_PIX_FMT_NV12; // same as av_videotoolbox_alloc_context()
1057         hw_frames->width = avctx->width;
1058         hw_frames->height = avctx->height;
1059
1060         err = av_hwframe_ctx_init(avctx->hw_frames_ctx);
1061         if (err < 0) {
1062             av_buffer_unref(&avctx->hw_frames_ctx);
1063             goto fail;
1064         }
1065     }
1066
1067     vtctx->cached_hw_frames_ctx = av_buffer_ref(avctx->hw_frames_ctx);
1068     if (!vtctx->cached_hw_frames_ctx) {
1069         err = AVERROR(ENOMEM);
1070         goto fail;
1071     }
1072
1073     vtctx->vt_ctx->cv_pix_fmt_type =
1074         av_map_videotoolbox_format_from_pixfmt(hw_frames->sw_format);
1075     if (!vtctx->vt_ctx->cv_pix_fmt_type) {
1076         av_log(avctx, AV_LOG_ERROR, "Unknown sw_format.\n");
1077         err = AVERROR(EINVAL);
1078         goto fail;
1079     }
1080
1081     err = videotoolbox_start(avctx);
1082     if (err < 0)
1083         goto fail;
1084
1085     return 0;
1086
1087 fail:
1088     videotoolbox_uninit(avctx);
1089     return err;
1090 }
1091
1092 static int videotoolbox_frame_params(AVCodecContext *avctx,
1093                                      AVBufferRef *hw_frames_ctx)
1094 {
1095     AVHWFramesContext *frames_ctx = (AVHWFramesContext*)hw_frames_ctx->data;
1096
1097     frames_ctx->format            = AV_PIX_FMT_VIDEOTOOLBOX;
1098     frames_ctx->width             = avctx->coded_width;
1099     frames_ctx->height            = avctx->coded_height;
1100     frames_ctx->sw_format         = AV_PIX_FMT_NV12;
1101
1102     return 0;
1103 }
1104
1105 const AVHWAccel ff_h263_videotoolbox_hwaccel = {
1106     .name           = "h263_videotoolbox",
1107     .type           = AVMEDIA_TYPE_VIDEO,
1108     .id             = AV_CODEC_ID_H263,
1109     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1110     .alloc_frame    = ff_videotoolbox_alloc_frame,
1111     .start_frame    = videotoolbox_mpeg_start_frame,
1112     .decode_slice   = videotoolbox_mpeg_decode_slice,
1113     .end_frame      = videotoolbox_mpeg_end_frame,
1114     .frame_params   = videotoolbox_frame_params,
1115     .init           = videotoolbox_common_init,
1116     .uninit         = videotoolbox_uninit,
1117     .priv_data_size = sizeof(VTContext),
1118 };
1119
1120 const AVHWAccel ff_hevc_videotoolbox_hwaccel = {
1121     .name           = "hevc_videotoolbox",
1122     .type           = AVMEDIA_TYPE_VIDEO,
1123     .id             = AV_CODEC_ID_HEVC,
1124     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1125     .alloc_frame    = ff_videotoolbox_alloc_frame,
1126     .start_frame    = videotoolbox_hevc_start_frame,
1127     .decode_slice   = videotoolbox_hevc_decode_slice,
1128     .decode_params  = videotoolbox_hevc_decode_params,
1129     .end_frame      = videotoolbox_hevc_end_frame,
1130     .frame_params   = videotoolbox_frame_params,
1131     .init           = videotoolbox_common_init,
1132     .uninit         = ff_videotoolbox_uninit,
1133     .priv_data_size = sizeof(VTContext),
1134 };
1135
1136 const AVHWAccel ff_h264_videotoolbox_hwaccel = {
1137     .name           = "h264_videotoolbox",
1138     .type           = AVMEDIA_TYPE_VIDEO,
1139     .id             = AV_CODEC_ID_H264,
1140     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1141     .alloc_frame    = ff_videotoolbox_alloc_frame,
1142     .start_frame    = ff_videotoolbox_h264_start_frame,
1143     .decode_slice   = ff_videotoolbox_h264_decode_slice,
1144     .decode_params  = videotoolbox_h264_decode_params,
1145     .end_frame      = videotoolbox_h264_end_frame,
1146     .frame_params   = videotoolbox_frame_params,
1147     .init           = videotoolbox_common_init,
1148     .uninit         = videotoolbox_uninit,
1149     .priv_data_size = sizeof(VTContext),
1150 };
1151
1152 const AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
1153     .name           = "mpeg1_videotoolbox",
1154     .type           = AVMEDIA_TYPE_VIDEO,
1155     .id             = AV_CODEC_ID_MPEG1VIDEO,
1156     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1157     .alloc_frame    = ff_videotoolbox_alloc_frame,
1158     .start_frame    = videotoolbox_mpeg_start_frame,
1159     .decode_slice   = videotoolbox_mpeg_decode_slice,
1160     .end_frame      = videotoolbox_mpeg_end_frame,
1161     .frame_params   = videotoolbox_frame_params,
1162     .init           = videotoolbox_common_init,
1163     .uninit         = videotoolbox_uninit,
1164     .priv_data_size = sizeof(VTContext),
1165 };
1166
1167 const AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
1168     .name           = "mpeg2_videotoolbox",
1169     .type           = AVMEDIA_TYPE_VIDEO,
1170     .id             = AV_CODEC_ID_MPEG2VIDEO,
1171     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1172     .alloc_frame    = ff_videotoolbox_alloc_frame,
1173     .start_frame    = videotoolbox_mpeg_start_frame,
1174     .decode_slice   = videotoolbox_mpeg_decode_slice,
1175     .end_frame      = videotoolbox_mpeg_end_frame,
1176     .frame_params   = videotoolbox_frame_params,
1177     .init           = videotoolbox_common_init,
1178     .uninit         = videotoolbox_uninit,
1179     .priv_data_size = sizeof(VTContext),
1180 };
1181
1182 const AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
1183     .name           = "mpeg4_videotoolbox",
1184     .type           = AVMEDIA_TYPE_VIDEO,
1185     .id             = AV_CODEC_ID_MPEG4,
1186     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1187     .alloc_frame    = ff_videotoolbox_alloc_frame,
1188     .start_frame    = videotoolbox_mpeg_start_frame,
1189     .decode_slice   = videotoolbox_mpeg_decode_slice,
1190     .end_frame      = videotoolbox_mpeg_end_frame,
1191     .frame_params   = videotoolbox_frame_params,
1192     .init           = videotoolbox_common_init,
1193     .uninit         = videotoolbox_uninit,
1194     .priv_data_size = sizeof(VTContext),
1195 };
1196
1197 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
1198 {
1199     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
1200
1201     if (ret) {
1202         ret->output_callback = videotoolbox_decoder_callback;
1203         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
1204     }
1205
1206     return ret;
1207 }
1208
1209 int av_videotoolbox_default_init(AVCodecContext *avctx)
1210 {
1211     return av_videotoolbox_default_init2(avctx, NULL);
1212 }
1213
1214 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
1215 {
1216     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
1217     if (!avctx->hwaccel_context)
1218         return AVERROR(ENOMEM);
1219     return videotoolbox_start(avctx);
1220 }
1221
1222 void av_videotoolbox_default_free(AVCodecContext *avctx)
1223 {
1224
1225     videotoolbox_stop(avctx);
1226     av_freep(&avctx->hwaccel_context);
1227 }
1228 #endif /* CONFIG_VIDEOTOOLBOX */