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