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 "libavutil/pixdesc.h"
  30 #include "bytestream.h"
  31 #include "decode.h"
  32 #include "h264dec.h"
  33 #include "hevcdec.h"
  34 #include "mpegvideo.h"
  35 #include <TargetConditionals.h>
  36
  37 #ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
  38 #  define kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder CFSTR("RequireHardwareAcceleratedVideoDecoder")
  39 #endif
  40 #ifndef kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
  41 #  define kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder CFSTR("EnableHardwareAcceleratedVideoDecoder")
  42 #endif
  43
  44 #if !HAVE_KCMVIDEOCODECTYPE_HEVC
  45 enum { kCMVideoCodecType_HEVC = 'hvc1' };
  46 #endif
  47
  48 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
  49
  50 typedef struct VTHWFrame {
  51     CVPixelBufferRef pixbuf;
  52     AVBufferRef *hw_frames_ctx;
  53 } VTHWFrame;
  54
  55 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
  56 {
  57     VTHWFrame *ref = (VTHWFrame *)data;
  58     av_buffer_unref(&ref->hw_frames_ctx);
  59     CVPixelBufferRelease(ref->pixbuf);
  60
  61     av_free(data);
  62 }
  63
  64 static int videotoolbox_buffer_copy(VTContext *vtctx,
  65                                     const uint8_t *buffer,
  66                                     uint32_t size)
  67 {
  68     void *tmp;
  69
  70     tmp = av_fast_realloc(vtctx->bitstream,
  71                          &vtctx->allocated_size,
  72                          size);
  73
  74     if (!tmp)
  75         return AVERROR(ENOMEM);
  76
  77     vtctx->bitstream = tmp;
  78     memcpy(vtctx->bitstream, buffer, size);
  79     vtctx->bitstream_size = size;
  80
  81     return 0;
  82 }
  83
  84 static int videotoolbox_postproc_frame(void *avctx, AVFrame *frame)
  85 {
  86     VTHWFrame *ref = (VTHWFrame *)frame->buf[0]->data;
  87
  88     if (!ref->pixbuf) {
  89         av_log(avctx, AV_LOG_ERROR, "No frame decoded?\n");
  90         av_frame_unref(frame);
  91         return AVERROR_EXTERNAL;
  92     }
  93
  94     frame->data[3] = (uint8_t*)ref->pixbuf;
  95
  96     if (ref->hw_frames_ctx) {
  97         av_buffer_unref(&frame->hw_frames_ctx);
  98         frame->hw_frames_ctx = av_buffer_ref(ref->hw_frames_ctx);
  99         if (!frame->hw_frames_ctx)
 100             return AVERROR(ENOMEM);
 101     }
 102
 103     return 0;
 104 }
 105
 106 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
 107 {
 108     size_t      size = sizeof(VTHWFrame);
 109     uint8_t    *data = NULL;
 110     AVBufferRef *buf = NULL;
 111     int ret = ff_attach_decode_data(frame);
 112     FrameDecodeData *fdd;
 113     if (ret < 0)
 114         return ret;
 115
 116     data = av_mallocz(size);
 117     if (!data)
 118         return AVERROR(ENOMEM);
 119     buf = av_buffer_create(data, size, videotoolbox_buffer_release, NULL, 0);
 120     if (!buf) {
 121         av_freep(&data);
 122         return AVERROR(ENOMEM);
 123     }
 124     frame->buf[0] = buf;
 125
 126     fdd = (FrameDecodeData*)frame->private_ref->data;
 127     fdd->post_process = videotoolbox_postproc_frame;
 128
 129     frame->width  = avctx->width;
 130     frame->height = avctx->height;
 131     frame->format = avctx->pix_fmt;
 132
 133     return 0;
 134 }
 135
 136 #define AV_W8(p, v) *(p) = (v)
 137
 138 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
 139 {
 140     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 141     H264Context *h = avctx->priv_data;
 142     CFDataRef data = NULL;
 143     uint8_t *p;
 144     int vt_extradata_size = 6 + 2 + h->ps.sps->data_size + 3 + h->ps.pps->data_size;
 145     uint8_t *vt_extradata = av_malloc(vt_extradata_size);
 146     if (!vt_extradata)
 147         return NULL;
 148
 149     p = vt_extradata;
 150
 151     AV_W8(p + 0, 1); /* version */
 152     AV_W8(p + 1, h->ps.sps->data[1]); /* profile */
 153     AV_W8(p + 2, h->ps.sps->data[2]); /* profile compat */
 154     AV_W8(p + 3, h->ps.sps->data[3]); /* level */
 155     AV_W8(p + 4, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 3 (11) */
 156     AV_W8(p + 5, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
 157     AV_WB16(p + 6, h->ps.sps->data_size);
 158     memcpy(p + 8, h->ps.sps->data, h->ps.sps->data_size);
 159     p += 8 + h->ps.sps->data_size;
 160     AV_W8(p + 0, 1); /* number of pps */
 161     AV_WB16(p + 1, h->ps.pps->data_size);
 162     memcpy(p + 3, h->ps.pps->data, h->ps.pps->data_size);
 163
 164     p += 3 + h->ps.pps->data_size;
 165     av_assert0(p - vt_extradata == vt_extradata_size);
 166
 167     // save sps header (profile/level) used to create decoder session,
 168     // so we can detect changes and recreate it.
 169     if (vtctx)
 170         memcpy(vtctx->sps, h->ps.sps->data + 1, 3);
 171
 172     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 173     av_free(vt_extradata);
 174     return data;
 175 }
 176
 177 CFDataRef ff_videotoolbox_hvcc_extradata_create(AVCodecContext *avctx)
 178 {
 179     HEVCContext *h = avctx->priv_data;
 180     int i, num_vps = 0, num_sps = 0, num_pps = 0;
 181     const HEVCVPS *vps = h->ps.vps;
 182     const HEVCSPS *sps = h->ps.sps;
 183     const HEVCPPS *pps = h->ps.pps;
 184     PTLCommon ptlc = vps->ptl.general_ptl;
 185     VUI vui = sps->vui;
 186     uint8_t parallelismType;
 187     CFDataRef data = NULL;
 188     uint8_t *p;
 189     int vt_extradata_size = 23 + 3 + 3 + 3;
 190     uint8_t *vt_extradata;
 191
 192 #define COUNT_SIZE_PS(T, t) \
 193     for (i = 0; i < HEVC_MAX_##T##PS_COUNT; i++) { \
 194         if (h->ps.t##ps_list[i]) { \
 195             const HEVC##T##PS *lps = (const HEVC##T##PS *)h->ps.t##ps_list[i]->data; \
 196             vt_extradata_size += 2 + lps->data_size; \
 197             num_##t##ps++; \
 198         } \
 199     }
 200
 201     COUNT_SIZE_PS(V, v)
 202     COUNT_SIZE_PS(S, s)
 203     COUNT_SIZE_PS(P, p)
 204
 205     vt_extradata = av_malloc(vt_extradata_size);
 206     if (!vt_extradata)
 207         return NULL;
 208     p = vt_extradata;
 209
 210     /* unsigned int(8) configurationVersion = 1; */
 211     AV_W8(p + 0, 1);
 212
 213     /*
 214      * unsigned int(2) general_profile_space;
 215      * unsigned int(1) general_tier_flag;
 216      * unsigned int(5) general_profile_idc;
 217      */
 218     AV_W8(p + 1, ptlc.profile_space << 6 |
 219                  ptlc.tier_flag     << 5 |
 220                  ptlc.profile_idc);
 221
 222     /* unsigned int(32) general_profile_compatibility_flags; */
 223     memcpy(p + 2, ptlc.profile_compatibility_flag, 4);
 224
 225     /* unsigned int(48) general_constraint_indicator_flags; */
 226     AV_W8(p + 6, ptlc.progressive_source_flag    << 7 |
 227                  ptlc.interlaced_source_flag     << 6 |
 228                  ptlc.non_packed_constraint_flag << 5 |
 229                  ptlc.frame_only_constraint_flag << 4);
 230     AV_W8(p + 7, 0);
 231     AV_WN32(p + 8, 0);
 232
 233     /* unsigned int(8) general_level_idc; */
 234     AV_W8(p + 12, ptlc.level_idc);
 235
 236     /*
 237      * bit(4) reserved = ‘1111’b;
 238      * unsigned int(12) min_spatial_segmentation_idc;
 239      */
 240     AV_W8(p + 13, 0xf0 | (vui.min_spatial_segmentation_idc >> 4));
 241     AV_W8(p + 14, vui.min_spatial_segmentation_idc & 0xff);
 242
 243     /*
 244      * bit(6) reserved = ‘111111’b;
 245      * unsigned int(2) parallelismType;
 246      */
 247     if (!vui.min_spatial_segmentation_idc)
 248         parallelismType = 0;
 249     else if (pps->entropy_coding_sync_enabled_flag && pps->tiles_enabled_flag)
 250         parallelismType = 0;
 251     else if (pps->entropy_coding_sync_enabled_flag)
 252         parallelismType = 3;
 253     else if (pps->tiles_enabled_flag)
 254         parallelismType = 2;
 255     else
 256         parallelismType = 1;
 257     AV_W8(p + 15, 0xfc | parallelismType);
 258
 259     /*
 260      * bit(6) reserved = ‘111111’b;
 261      * unsigned int(2) chromaFormat;
 262      */
 263     AV_W8(p + 16, sps->chroma_format_idc | 0xfc);
 264
 265     /*
 266      * bit(5) reserved = ‘11111’b;
 267      * unsigned int(3) bitDepthLumaMinus8;
 268      */
 269     AV_W8(p + 17, (sps->bit_depth - 8) | 0xfc);
 270
 271     /*
 272      * bit(5) reserved = ‘11111’b;
 273      * unsigned int(3) bitDepthChromaMinus8;
 274      */
 275     AV_W8(p + 18, (sps->bit_depth_chroma - 8) | 0xfc);
 276
 277     /* bit(16) avgFrameRate; */
 278     AV_WB16(p + 19, 0);
 279
 280     /*
 281      * bit(2) constantFrameRate;
 282      * bit(3) numTemporalLayers;
 283      * bit(1) temporalIdNested;
 284      * unsigned int(2) lengthSizeMinusOne;
 285      */
 286     AV_W8(p + 21, 0                             << 6 |
 287                   sps->max_sub_layers           << 3 |
 288                   sps->temporal_id_nesting_flag << 2 |
 289                   3);
 290
 291     /* unsigned int(8) numOfArrays; */
 292     AV_W8(p + 22, 3);
 293
 294     p += 23;
 295
 296 #define APPEND_PS(T, t) \
 297     /* \
 298      * bit(1) array_completeness; \
 299      * unsigned int(1) reserved = 0; \
 300      * unsigned int(6) NAL_unit_type; \
 301      */ \
 302     AV_W8(p, 1 << 7 | \
 303              HEVC_NAL_##T##PS & 0x3f); \
 304     /* unsigned int(16) numNalus; */ \
 305     AV_WB16(p + 1, num_##t##ps); \
 306     p += 3; \
 307     for (i = 0; i < HEVC_MAX_##T##PS_COUNT; i++) { \
 308         if (h->ps.t##ps_list[i]) { \
 309             const HEVC##T##PS *lps = (const HEVC##T##PS *)h->ps.t##ps_list[i]->data; \
 310             /* unsigned int(16) nalUnitLength; */ \
 311             AV_WB16(p, lps->data_size); \
 312             /* bit(8*nalUnitLength) nalUnit; */ \
 313             memcpy(p + 2, lps->data, lps->data_size); \
 314             p += 2 + lps->data_size; \
 315         } \
 316     }
 317
 318     APPEND_PS(V, v)
 319     APPEND_PS(S, s)
 320     APPEND_PS(P, p)
 321
 322     av_assert0(p - vt_extradata == vt_extradata_size);
 323
 324     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
 325     av_free(vt_extradata);
 326     return data;
 327 }
 328
 329 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
 330                                      const uint8_t *buffer,
 331                                      uint32_t size)
 332 {
 333     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 334     H264Context *h = avctx->priv_data;
 335
 336     if (h->is_avc == 1) {
 337         return videotoolbox_buffer_copy(vtctx, buffer, size);
 338     }
 339
 340     return 0;
 341 }
 342
 343 static int videotoolbox_h264_decode_params(AVCodecContext *avctx,
 344                                            int type,
 345                                            const uint8_t *buffer,
 346                                            uint32_t size)
 347 {
 348     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 349     H264Context *h = avctx->priv_data;
 350
 351     // save sps header (profile/level) used to create decoder session
 352     if (!vtctx->sps[0])
 353         memcpy(vtctx->sps, h->ps.sps->data + 1, 3);
 354
 355     if (type == H264_NAL_SPS) {
 356         if (size > 4 && memcmp(vtctx->sps, buffer + 1, 3) != 0) {
 357             vtctx->reconfig_needed = true;
 358             memcpy(vtctx->sps, buffer + 1, 3);
 359         }
 360     }
 361
 362     // pass-through SPS/PPS changes to the decoder
 363     return ff_videotoolbox_h264_decode_slice(avctx, buffer, size);
 364 }
 365
 366 static int videotoolbox_common_decode_slice(AVCodecContext *avctx,
 367                                             const uint8_t *buffer,
 368                                             uint32_t size)
 369 {
 370     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 371     void *tmp;
 372
 373     tmp = av_fast_realloc(vtctx->bitstream,
 374                           &vtctx->allocated_size,
 375                           vtctx->bitstream_size+size+4);
 376     if (!tmp)
 377         return AVERROR(ENOMEM);
 378
 379     vtctx->bitstream = tmp;
 380
 381     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
 382     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
 383
 384     vtctx->bitstream_size += size + 4;
 385
 386     return 0;
 387 }
 388
 389 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
 390                                       const uint8_t *buffer,
 391                                       uint32_t size)
 392 {
 393     H264Context *h = avctx->priv_data;
 394
 395     if (h->is_avc == 1)
 396         return 0;
 397
 398     return videotoolbox_common_decode_slice(avctx, buffer, size);
 399 }
 400
 401 int ff_videotoolbox_uninit(AVCodecContext *avctx)
 402 {
 403     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 404     if (vtctx) {
 405         av_freep(&vtctx->bitstream);
 406         if (vtctx->frame)
 407             CVPixelBufferRelease(vtctx->frame);
 408     }
 409
 410     return 0;
 411 }
 412
 413 #if CONFIG_VIDEOTOOLBOX
 414 // Return the AVVideotoolboxContext that matters currently. Where it comes from
 415 // depends on the API used.
 416 static AVVideotoolboxContext *videotoolbox_get_context(AVCodecContext *avctx)
 417 {
 418     // Somewhat tricky because the user can call av_videotoolbox_default_free()
 419     // at any time, even when the codec is closed.
 420     if (avctx->internal && avctx->internal->hwaccel_priv_data) {
 421         VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 422         if (vtctx->vt_ctx)
 423             return vtctx->vt_ctx;
 424     }
 425     return avctx->hwaccel_context;
 426 }
 427
 428 static int videotoolbox_buffer_create(AVCodecContext *avctx, AVFrame *frame)
 429 {
 430     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 431     CVPixelBufferRef pixbuf = (CVPixelBufferRef)vtctx->frame;
 432     OSType pixel_format = CVPixelBufferGetPixelFormatType(pixbuf);
 433     enum AVPixelFormat sw_format = av_map_videotoolbox_format_to_pixfmt(pixel_format);
 434     int width = CVPixelBufferGetWidth(pixbuf);
 435     int height = CVPixelBufferGetHeight(pixbuf);
 436     AVHWFramesContext *cached_frames;
 437     VTHWFrame *ref;
 438     int ret;
 439
 440     if (!frame->buf[0] || frame->data[3]) {
 441         av_log(avctx, AV_LOG_ERROR, "videotoolbox: invalid state\n");
 442         av_frame_unref(frame);
 443         return AVERROR_EXTERNAL;
 444     }
 445
 446     ref = (VTHWFrame *)frame->buf[0]->data;
 447
 448     if (ref->pixbuf)
 449         CVPixelBufferRelease(ref->pixbuf);
 450     ref->pixbuf = vtctx->frame;
 451     vtctx->frame = NULL;
 452
 453     // Old API code path.
 454     if (!vtctx->cached_hw_frames_ctx)
 455         return 0;
 456
 457     cached_frames = (AVHWFramesContext*)vtctx->cached_hw_frames_ctx->data;
 458
 459     if (cached_frames->sw_format != sw_format ||
 460         cached_frames->width != width ||
 461         cached_frames->height != height) {
 462         AVBufferRef *hw_frames_ctx = av_hwframe_ctx_alloc(cached_frames->device_ref);
 463         AVHWFramesContext *hw_frames;
 464         if (!hw_frames_ctx)
 465             return AVERROR(ENOMEM);
 466
 467         hw_frames = (AVHWFramesContext*)hw_frames_ctx->data;
 468         hw_frames->format = cached_frames->format;
 469         hw_frames->sw_format = sw_format;
 470         hw_frames->width = width;
 471         hw_frames->height = height;
 472
 473         ret = av_hwframe_ctx_init(hw_frames_ctx);
 474         if (ret < 0) {
 475             av_buffer_unref(&hw_frames_ctx);
 476             return ret;
 477         }
 478
 479         av_buffer_unref(&vtctx->cached_hw_frames_ctx);
 480         vtctx->cached_hw_frames_ctx = hw_frames_ctx;
 481     }
 482
 483     av_buffer_unref(&ref->hw_frames_ctx);
 484     ref->hw_frames_ctx = av_buffer_ref(vtctx->cached_hw_frames_ctx);
 485     if (!ref->hw_frames_ctx)
 486         return AVERROR(ENOMEM);
 487
 488     return 0;
 489 }
 490
 491 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
 492 {
 493     int i;
 494     uint8_t b;
 495
 496     for (i = 3; i >= 0; i--) {
 497         b = (length >> (i * 7)) & 0x7F;
 498         if (i != 0)
 499             b |= 0x80;
 500
 501         bytestream2_put_byteu(pb, b);
 502     }
 503 }
 504
 505 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
 506 {
 507     CFDataRef data;
 508     uint8_t *rw_extradata;
 509     PutByteContext pb;
 510     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
 511     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
 512     int config_size = 13 + 5 + avctx->extradata_size;
 513     int s;
 514
 515     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
 516         return NULL;
 517
 518     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
 519     bytestream2_put_byteu(&pb, 0);        // version
 520     bytestream2_put_ne24(&pb, 0);         // flags
 521
 522     // elementary stream descriptor
 523     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
 524     videotoolbox_write_mp4_descr_length(&pb, full_size);
 525     bytestream2_put_ne16(&pb, 0);         // esid
 526     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
 527
 528     // decoder configuration descriptor
 529     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
 530     videotoolbox_write_mp4_descr_length(&pb, config_size);
 531     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
 532     bytestream2_put_byteu(&pb, 0x11);     // stream type
 533     bytestream2_put_ne24(&pb, 0);         // buffer size
 534     bytestream2_put_ne32(&pb, 0);         // max bitrate
 535     bytestream2_put_ne32(&pb, 0);         // avg bitrate
 536
 537     // decoder specific descriptor
 538     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
 539     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
 540
 541     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
 542
 543     // SLConfigDescriptor
 544     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
 545     bytestream2_put_byteu(&pb, 0x01);     // length
 546     bytestream2_put_byteu(&pb, 0x02);     //
 547
 548     s = bytestream2_size_p(&pb);
 549
 550     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
 551
 552     av_freep(&rw_extradata);
 553     return data;
 554 }
 555
 556 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
 557                                                            void *buffer,
 558                                                            int size)
 559 {
 560     OSStatus status;
 561     CMBlockBufferRef  block_buf;
 562     CMSampleBufferRef sample_buf;
 563
 564     block_buf  = NULL;
 565     sample_buf = NULL;
 566
 567     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
 568                                                 buffer,             // memoryBlock
 569                                                 size,               // blockLength
 570                                                 kCFAllocatorNull,   // blockAllocator
 571                                                 NULL,               // customBlockSource
 572                                                 0,                  // offsetToData
 573                                                 size,               // dataLength
 574                                                 0,                  // flags
 575                                                 &block_buf);
 576
 577     if (!status) {
 578         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
 579                                       block_buf,            // dataBuffer
 580                                       TRUE,                 // dataReady
 581                                       0,                    // makeDataReadyCallback
 582                                       0,                    // makeDataReadyRefcon
 583                                       fmt_desc,             // formatDescription
 584                                       1,                    // numSamples
 585                                       0,                    // numSampleTimingEntries
 586                                       NULL,                 // sampleTimingArray
 587                                       0,                    // numSampleSizeEntries
 588                                       NULL,                 // sampleSizeArray
 589                                       &sample_buf);
 590     }
 591
 592     if (block_buf)
 593         CFRelease(block_buf);
 594
 595     return sample_buf;
 596 }
 597
 598 static void videotoolbox_decoder_callback(void *opaque,
 599                                           void *sourceFrameRefCon,
 600                                           OSStatus status,
 601                                           VTDecodeInfoFlags flags,
 602                                           CVImageBufferRef image_buffer,
 603                                           CMTime pts,
 604                                           CMTime duration)
 605 {
 606     AVCodecContext *avctx = opaque;
 607     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 608
 609     if (vtctx->frame) {
 610         CVPixelBufferRelease(vtctx->frame);
 611         vtctx->frame = NULL;
 612     }
 613
 614     if (!image_buffer) {
 615         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
 616         return;
 617     }
 618
 619     vtctx->frame = CVPixelBufferRetain(image_buffer);
 620 }
 621
 622 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
 623 {
 624     OSStatus status;
 625     CMSampleBufferRef sample_buf;
 626     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 627     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 628
 629     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
 630                                                    vtctx->bitstream,
 631                                                    vtctx->bitstream_size);
 632
 633     if (!sample_buf)
 634         return -1;
 635
 636     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
 637                                                sample_buf,
 638                                                0,       // decodeFlags
 639                                                NULL,    // sourceFrameRefCon
 640                                                0);      // infoFlagsOut
 641     if (status == noErr)
 642         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
 643
 644     CFRelease(sample_buf);
 645
 646     return status;
 647 }
 648
 649 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
 650                                                                    CFDictionaryRef decoder_spec,
 651                                                                    int width,
 652                                                                    int height)
 653 {
 654     CMFormatDescriptionRef cm_fmt_desc;
 655     OSStatus status;
 656
 657     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
 658                                             codec_type,
 659                                             width,
 660                                             height,
 661                                             decoder_spec, // Dictionary of extension
 662                                             &cm_fmt_desc);
 663
 664     if (status)
 665         return NULL;
 666
 667     return cm_fmt_desc;
 668 }
 669
 670 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
 671                                                              int height,
 672                                                              OSType pix_fmt)
 673 {
 674     CFMutableDictionaryRef buffer_attributes;
 675     CFMutableDictionaryRef io_surface_properties;
 676     CFNumberRef cv_pix_fmt;
 677     CFNumberRef w;
 678     CFNumberRef h;
 679
 680     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
 681     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
 682     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
 683
 684     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 685                                                   4,
 686                                                   &kCFTypeDictionaryKeyCallBacks,
 687                                                   &kCFTypeDictionaryValueCallBacks);
 688     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 689                                                       0,
 690                                                       &kCFTypeDictionaryKeyCallBacks,
 691                                                       &kCFTypeDictionaryValueCallBacks);
 692
 693     if (pix_fmt)
 694         CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
 695     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
 696     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
 697     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
 698 #if TARGET_OS_IPHONE
 699     CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
 700 #else
 701     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
 702 #endif
 703
 704     CFRelease(io_surface_properties);
 705     CFRelease(cv_pix_fmt);
 706     CFRelease(w);
 707     CFRelease(h);
 708
 709     return buffer_attributes;
 710 }
 711
 712 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
 713                                                           AVCodecContext *avctx)
 714 {
 715     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 716                                                                    0,
 717                                                                    &kCFTypeDictionaryKeyCallBacks,
 718                                                                    &kCFTypeDictionaryValueCallBacks);
 719
 720     CFDictionarySetValue(config_info,
 721                          codec_type == kCMVideoCodecType_HEVC ?
 722                             kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder :
 723                             kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
 724                          kCFBooleanTrue);
 725
 726     CFMutableDictionaryRef avc_info;
 727     CFDataRef data = NULL;
 728
 729     avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 730                                          1,
 731                                          &kCFTypeDictionaryKeyCallBacks,
 732                                          &kCFTypeDictionaryValueCallBacks);
 733
 734     switch (codec_type) {
 735     case kCMVideoCodecType_MPEG4Video :
 736         if (avctx->extradata_size)
 737             data = videotoolbox_esds_extradata_create(avctx);
 738         if (data)
 739             CFDictionarySetValue(avc_info, CFSTR("esds"), data);
 740         break;
 741     case kCMVideoCodecType_H264 :
 742         data = ff_videotoolbox_avcc_extradata_create(avctx);
 743         if (data)
 744             CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
 745         break;
 746     case kCMVideoCodecType_HEVC :
 747         data = ff_videotoolbox_hvcc_extradata_create(avctx);
 748         if (data)
 749             CFDictionarySetValue(avc_info, CFSTR("hvcC"), data);
 750         break;
 751     default:
 752         break;
 753     }
 754
 755     CFDictionarySetValue(config_info,
 756             kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
 757             avc_info);
 758
 759     if (data)
 760         CFRelease(data);
 761
 762     CFRelease(avc_info);
 763     return config_info;
 764 }
 765
 766 static int videotoolbox_start(AVCodecContext *avctx)
 767 {
 768     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 769     OSStatus status;
 770     VTDecompressionOutputCallbackRecord decoder_cb;
 771     CFDictionaryRef decoder_spec;
 772     CFDictionaryRef buf_attr;
 773
 774     if (!videotoolbox) {
 775         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
 776         return -1;
 777     }
 778
 779     switch( avctx->codec_id ) {
 780     case AV_CODEC_ID_H263 :
 781         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
 782         break;
 783     case AV_CODEC_ID_H264 :
 784         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
 785         break;
 786     case AV_CODEC_ID_HEVC :
 787         videotoolbox->cm_codec_type = kCMVideoCodecType_HEVC;
 788         break;
 789     case AV_CODEC_ID_MPEG1VIDEO :
 790         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
 791         break;
 792     case AV_CODEC_ID_MPEG2VIDEO :
 793         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
 794         break;
 795     case AV_CODEC_ID_MPEG4 :
 796         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
 797         break;
 798     default :
 799         break;
 800     }
 801
 802     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
 803
 804     if (!decoder_spec) {
 805         av_log(avctx, AV_LOG_ERROR, "decoder specification creation failed\n");
 806         return -1;
 807     }
 808
 809     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
 810                                                                 decoder_spec,
 811                                                                 avctx->width,
 812                                                                 avctx->height);
 813     if (!videotoolbox->cm_fmt_desc) {
 814         if (decoder_spec)
 815             CFRelease(decoder_spec);
 816
 817         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
 818         return -1;
 819     }
 820
 821     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
 822                                                      avctx->height,
 823                                                      videotoolbox->cv_pix_fmt_type);
 824
 825     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
 826     decoder_cb.decompressionOutputRefCon   = avctx;
 827
 828     status = VTDecompressionSessionCreate(NULL,                      // allocator
 829                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
 830                                           decoder_spec,              // videoDecoderSpecification
 831                                           buf_attr,                  // destinationImageBufferAttributes
 832                                           &decoder_cb,               // outputCallback
 833                                           &videotoolbox->session);   // decompressionSessionOut
 834
 835     if (decoder_spec)
 836         CFRelease(decoder_spec);
 837     if (buf_attr)
 838         CFRelease(buf_attr);
 839
 840     switch (status) {
 841     case kVTVideoDecoderNotAvailableNowErr:
 842         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox session not available.\n");
 843         return AVERROR(ENOSYS);
 844     case kVTVideoDecoderUnsupportedDataFormatErr:
 845         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox does not support this format.\n");
 846         return AVERROR(ENOSYS);
 847     case kVTCouldNotFindVideoDecoderErr:
 848         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox decoder for this format not found.\n");
 849         return AVERROR(ENOSYS);
 850     case kVTVideoDecoderMalfunctionErr:
 851         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox malfunction.\n");
 852         return AVERROR(EINVAL);
 853     case kVTVideoDecoderBadDataErr:
 854         av_log(avctx, AV_LOG_VERBOSE, "VideoToolbox reported invalid data.\n");
 855         return AVERROR_INVALIDDATA;
 856     case 0:
 857         return 0;
 858     default:
 859         av_log(avctx, AV_LOG_VERBOSE, "Unknown VideoToolbox session creation error %d\n", (int)status);
 860         return AVERROR_UNKNOWN;
 861     }
 862 }
 863
 864 static void videotoolbox_stop(AVCodecContext *avctx)
 865 {
 866     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 867     if (!videotoolbox)
 868         return;
 869
 870     if (videotoolbox->cm_fmt_desc) {
 871         CFRelease(videotoolbox->cm_fmt_desc);
 872         videotoolbox->cm_fmt_desc = NULL;
 873     }
 874
 875     if (videotoolbox->session) {
 876         VTDecompressionSessionInvalidate(videotoolbox->session);
 877         CFRelease(videotoolbox->session);
 878         videotoolbox->session = NULL;
 879     }
 880 }
 881
 882 static const char *videotoolbox_error_string(OSStatus status)
 883 {
 884     switch (status) {
 885         case kVTVideoDecoderBadDataErr:
 886             return "bad data";
 887         case kVTVideoDecoderMalfunctionErr:
 888             return "decoder malfunction";
 889         case kVTInvalidSessionErr:
 890             return "invalid session";
 891     }
 892     return "unknown";
 893 }
 894
 895 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
 896 {
 897     OSStatus status;
 898     AVVideotoolboxContext *videotoolbox = videotoolbox_get_context(avctx);
 899     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 900
 901     frame->crop_right = 0;
 902     frame->crop_left = 0;
 903     frame->crop_top = 0;
 904     frame->crop_bottom = 0;
 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
 973     h->output_frame->crop_right = 0;
 974     h->output_frame->crop_left = 0;
 975     h->output_frame->crop_top = 0;
 976     h->output_frame->crop_bottom = 0;
 977
 978     int ret = videotoolbox_common_end_frame(avctx, frame);
 979     vtctx->bitstream_size = 0;
 980     return ret;
 981 }
 982
 983 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
 984                                          const uint8_t *buffer,
 985                                          uint32_t size)
 986 {
 987     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
 988
 989     return videotoolbox_buffer_copy(vtctx, buffer, size);
 990 }
 991
 992 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
 993                                           const uint8_t *buffer,
 994                                           uint32_t size)
 995 {
 996     return 0;
 997 }
 998
 999 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
1000 {
1001     MpegEncContext *s = avctx->priv_data;
1002     AVFrame *frame = s->current_picture_ptr->f;
1003
1004     return videotoolbox_common_end_frame(avctx, frame);
1005 }
1006
1007 static int videotoolbox_uninit(AVCodecContext *avctx)
1008 {
1009     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
1010     if (!vtctx)
1011         return 0;
1012
1013     ff_videotoolbox_uninit(avctx);
1014
1015     if (vtctx->vt_ctx)
1016         videotoolbox_stop(avctx);
1017
1018     av_buffer_unref(&vtctx->cached_hw_frames_ctx);
1019     av_freep(&vtctx->vt_ctx);
1020
1021     return 0;
1022 }
1023
1024 static enum AVPixelFormat videotoolbox_best_pixel_format(AVCodecContext *avctx) {
1025     const AVPixFmtDescriptor *descriptor = av_pix_fmt_desc_get(avctx->pix_fmt);
1026     if (!descriptor)
1027         return AV_PIX_FMT_NV12; // same as av_videotoolbox_alloc_context()
1028
1029     int depth = descriptor->comp[0].depth;
1030     if (depth > 8) {
1031         return AV_PIX_FMT_P010;
1032     }
1033
1034     return AV_PIX_FMT_NV12;
1035 }
1036
1037 static int videotoolbox_common_init(AVCodecContext *avctx)
1038 {
1039     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
1040     AVHWFramesContext *hw_frames;
1041     int err;
1042
1043     // Old API - do nothing.
1044     if (avctx->hwaccel_context)
1045         return 0;
1046
1047     if (!avctx->hw_frames_ctx && !avctx->hw_device_ctx) {
1048         av_log(avctx, AV_LOG_ERROR,
1049                "Either hw_frames_ctx or hw_device_ctx must be set.\n");
1050         return AVERROR(EINVAL);
1051     }
1052
1053     vtctx->vt_ctx = av_videotoolbox_alloc_context();
1054     if (!vtctx->vt_ctx) {
1055         err = AVERROR(ENOMEM);
1056         goto fail;
1057     }
1058
1059     if (avctx->hw_frames_ctx) {
1060         hw_frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
1061     } else {
1062         avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);
1063         if (!avctx->hw_frames_ctx) {
1064             err = AVERROR(ENOMEM);
1065             goto fail;
1066         }
1067
1068         hw_frames = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
1069         hw_frames->format = AV_PIX_FMT_VIDEOTOOLBOX;
1070         hw_frames->sw_format = videotoolbox_best_pixel_format(avctx);
1071         hw_frames->width = avctx->width;
1072         hw_frames->height = avctx->height;
1073
1074         err = av_hwframe_ctx_init(avctx->hw_frames_ctx);
1075         if (err < 0) {
1076             av_buffer_unref(&avctx->hw_frames_ctx);
1077             goto fail;
1078         }
1079     }
1080
1081     vtctx->cached_hw_frames_ctx = av_buffer_ref(avctx->hw_frames_ctx);
1082     if (!vtctx->cached_hw_frames_ctx) {
1083         err = AVERROR(ENOMEM);
1084         goto fail;
1085     }
1086
1087     vtctx->vt_ctx->cv_pix_fmt_type =
1088         av_map_videotoolbox_format_from_pixfmt(hw_frames->sw_format);
1089     if (!vtctx->vt_ctx->cv_pix_fmt_type) {
1090         av_log(avctx, AV_LOG_ERROR, "Unknown sw_format.\n");
1091         err = AVERROR(EINVAL);
1092         goto fail;
1093     }
1094
1095     err = videotoolbox_start(avctx);
1096     if (err < 0)
1097         goto fail;
1098
1099     return 0;
1100
1101 fail:
1102     videotoolbox_uninit(avctx);
1103     return err;
1104 }
1105
1106 static int videotoolbox_frame_params(AVCodecContext *avctx,
1107                                      AVBufferRef *hw_frames_ctx)
1108 {
1109     AVHWFramesContext *frames_ctx = (AVHWFramesContext*)hw_frames_ctx->data;
1110
1111     frames_ctx->format            = AV_PIX_FMT_VIDEOTOOLBOX;
1112     frames_ctx->width             = avctx->coded_width;
1113     frames_ctx->height            = avctx->coded_height;
1114     frames_ctx->sw_format         = videotoolbox_best_pixel_format(avctx);
1115
1116     return 0;
1117 }
1118
1119 const AVHWAccel ff_h263_videotoolbox_hwaccel = {
1120     .name           = "h263_videotoolbox",
1121     .type           = AVMEDIA_TYPE_VIDEO,
1122     .id             = AV_CODEC_ID_H263,
1123     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1124     .alloc_frame    = ff_videotoolbox_alloc_frame,
1125     .start_frame    = videotoolbox_mpeg_start_frame,
1126     .decode_slice   = videotoolbox_mpeg_decode_slice,
1127     .end_frame      = videotoolbox_mpeg_end_frame,
1128     .frame_params   = videotoolbox_frame_params,
1129     .init           = videotoolbox_common_init,
1130     .uninit         = videotoolbox_uninit,
1131     .priv_data_size = sizeof(VTContext),
1132 };
1133
1134 const AVHWAccel ff_hevc_videotoolbox_hwaccel = {
1135     .name           = "hevc_videotoolbox",
1136     .type           = AVMEDIA_TYPE_VIDEO,
1137     .id             = AV_CODEC_ID_HEVC,
1138     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1139     .alloc_frame    = ff_videotoolbox_alloc_frame,
1140     .start_frame    = videotoolbox_hevc_start_frame,
1141     .decode_slice   = videotoolbox_hevc_decode_slice,
1142     .decode_params  = videotoolbox_hevc_decode_params,
1143     .end_frame      = videotoolbox_hevc_end_frame,
1144     .frame_params   = videotoolbox_frame_params,
1145     .init           = videotoolbox_common_init,
1146     .uninit         = ff_videotoolbox_uninit,
1147     .priv_data_size = sizeof(VTContext),
1148 };
1149
1150 const AVHWAccel ff_h264_videotoolbox_hwaccel = {
1151     .name           = "h264_videotoolbox",
1152     .type           = AVMEDIA_TYPE_VIDEO,
1153     .id             = AV_CODEC_ID_H264,
1154     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1155     .alloc_frame    = ff_videotoolbox_alloc_frame,
1156     .start_frame    = ff_videotoolbox_h264_start_frame,
1157     .decode_slice   = ff_videotoolbox_h264_decode_slice,
1158     .decode_params  = videotoolbox_h264_decode_params,
1159     .end_frame      = videotoolbox_h264_end_frame,
1160     .frame_params   = videotoolbox_frame_params,
1161     .init           = videotoolbox_common_init,
1162     .uninit         = videotoolbox_uninit,
1163     .priv_data_size = sizeof(VTContext),
1164 };
1165
1166 const AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
1167     .name           = "mpeg1_videotoolbox",
1168     .type           = AVMEDIA_TYPE_VIDEO,
1169     .id             = AV_CODEC_ID_MPEG1VIDEO,
1170     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1171     .alloc_frame    = ff_videotoolbox_alloc_frame,
1172     .start_frame    = videotoolbox_mpeg_start_frame,
1173     .decode_slice   = videotoolbox_mpeg_decode_slice,
1174     .end_frame      = videotoolbox_mpeg_end_frame,
1175     .frame_params   = videotoolbox_frame_params,
1176     .init           = videotoolbox_common_init,
1177     .uninit         = videotoolbox_uninit,
1178     .priv_data_size = sizeof(VTContext),
1179 };
1180
1181 const AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
1182     .name           = "mpeg2_videotoolbox",
1183     .type           = AVMEDIA_TYPE_VIDEO,
1184     .id             = AV_CODEC_ID_MPEG2VIDEO,
1185     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1186     .alloc_frame    = ff_videotoolbox_alloc_frame,
1187     .start_frame    = videotoolbox_mpeg_start_frame,
1188     .decode_slice   = videotoolbox_mpeg_decode_slice,
1189     .end_frame      = videotoolbox_mpeg_end_frame,
1190     .frame_params   = videotoolbox_frame_params,
1191     .init           = videotoolbox_common_init,
1192     .uninit         = videotoolbox_uninit,
1193     .priv_data_size = sizeof(VTContext),
1194 };
1195
1196 const AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
1197     .name           = "mpeg4_videotoolbox",
1198     .type           = AVMEDIA_TYPE_VIDEO,
1199     .id             = AV_CODEC_ID_MPEG4,
1200     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
1201     .alloc_frame    = ff_videotoolbox_alloc_frame,
1202     .start_frame    = videotoolbox_mpeg_start_frame,
1203     .decode_slice   = videotoolbox_mpeg_decode_slice,
1204     .end_frame      = videotoolbox_mpeg_end_frame,
1205     .frame_params   = videotoolbox_frame_params,
1206     .init           = videotoolbox_common_init,
1207     .uninit         = videotoolbox_uninit,
1208     .priv_data_size = sizeof(VTContext),
1209 };
1210
1211 static AVVideotoolboxContext *av_videotoolbox_alloc_context_with_pix_fmt(enum AVPixelFormat pix_fmt)
1212 {
1213     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
1214
1215     if (ret) {
1216         ret->output_callback = videotoolbox_decoder_callback;
1217
1218         OSType cv_pix_fmt_type = av_map_videotoolbox_format_from_pixfmt(pix_fmt);
1219         if (cv_pix_fmt_type == 0) {
1220             cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
1221         }
1222         ret->cv_pix_fmt_type = cv_pix_fmt_type;
1223     }
1224
1225     return ret;
1226 }
1227
1228 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
1229 {
1230     return av_videotoolbox_alloc_context_with_pix_fmt(AV_PIX_FMT_NONE);
1231 }
1232
1233 int av_videotoolbox_default_init(AVCodecContext *avctx)
1234 {
1235     return av_videotoolbox_default_init2(avctx, NULL);
1236 }
1237
1238 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
1239 {
1240     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context_with_pix_fmt(videotoolbox_best_pixel_format(avctx));
1241     if (!avctx->hwaccel_context)
1242         return AVERROR(ENOMEM);
1243     return videotoolbox_start(avctx);
1244 }
1245
1246 void av_videotoolbox_default_free(AVCodecContext *avctx)
1247 {
1248
1249     videotoolbox_stop(avctx);
1250     av_freep(&avctx->hwaccel_context);
1251 }
1252 #endif /* CONFIG_VIDEOTOOLBOX */