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