avcodec/videotoolbox: fix decoding of some h264 bitstreams
[ffmpeg.git] / 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 #if CONFIG_VIDEOTOOLBOX
25 #  include "videotoolbox.h"
26 #else
27 #  include "vda.h"
28 #endif
29 #include "vda_vt_internal.h"
30 #include "libavutil/avutil.h"
31 #include "bytestream.h"
32 #include "h264.h"
33 #include "mpegvideo.h"
34
35 #ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
36 #  define kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder CFSTR("RequireHardwareAcceleratedVideoDecoder")
37 #endif
38
39 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
40
41 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
42 {
43     CVPixelBufferRef cv_buffer = (CVImageBufferRef)data;
44     CVPixelBufferRelease(cv_buffer);
45 }
46
47 static int videotoolbox_buffer_copy(VTContext *vtctx,
48                                     const uint8_t *buffer,
49                                     uint32_t size)
50 {
51     void *tmp;
52
53     tmp = av_fast_realloc(vtctx->bitstream,
54                          &vtctx->allocated_size,
55                          size);
56
57     if (!tmp)
58         return AVERROR(ENOMEM);
59
60     vtctx->bitstream = tmp;
61     memcpy(vtctx->bitstream, buffer, size);
62     vtctx->bitstream_size = size;
63
64     return 0;
65 }
66
67 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
68 {
69     frame->width  = avctx->width;
70     frame->height = avctx->height;
71     frame->format = avctx->pix_fmt;
72     frame->buf[0] = av_buffer_alloc(1);
73
74     if (!frame->buf[0])
75         return AVERROR(ENOMEM);
76
77     return 0;
78 }
79
80 #define AV_W8(p, v) *(p) = (v)
81
82 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
83 {
84     H264Context *h     = avctx->priv_data;
85     CFDataRef data = NULL;
86     uint8_t *p;
87     int vt_extradata_size = 6 + 3 + h->sps.data_size + 4 + h->pps.data_size;
88     uint8_t *vt_extradata = av_malloc(vt_extradata_size);
89     if (!vt_extradata)
90         return NULL;
91
92     p = vt_extradata;
93
94     AV_W8(p + 0, 1); /* version */
95     AV_W8(p + 1, h->sps.data[0]); /* profile */
96     AV_W8(p + 2, h->sps.data[1]); /* profile compat */
97     AV_W8(p + 3, h->sps.data[2]); /* level */
98     AV_W8(p + 4, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 3 (11) */
99     AV_W8(p + 5, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
100     AV_WB16(p + 6, h->sps.data_size + 1);
101     AV_W8(p + 8, NAL_SPS | (3 << 5)); // NAL unit header
102     memcpy(p + 9, h->sps.data, h->sps.data_size);
103     p += 9 + h->sps.data_size;
104     AV_W8(p + 0, 1); /* number of pps */
105     AV_WB16(p + 1, h->pps.data_size + 1);
106     AV_W8(p + 3, NAL_PPS | (3 << 5)); // NAL unit header
107     memcpy(p + 4, h->pps.data, h->pps.data_size);
108
109     p += 4 + h->pps.data_size;
110     av_assert0(p - vt_extradata == vt_extradata_size);
111
112     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
113     av_free(vt_extradata);
114     return data;
115 }
116
117 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
118 {
119     av_buffer_unref(&frame->buf[0]);
120
121     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
122                                      sizeof(vtctx->frame),
123                                      videotoolbox_buffer_release,
124                                      NULL,
125                                      AV_BUFFER_FLAG_READONLY);
126     if (!frame->buf[0]) {
127         return AVERROR(ENOMEM);
128     }
129
130     frame->data[3] = (uint8_t*)vtctx->frame;
131     vtctx->frame = NULL;
132
133     return 0;
134 }
135
136 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
137                                      const uint8_t *buffer,
138                                      uint32_t size)
139 {
140     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
141     H264Context *h  = avctx->priv_data;
142
143     vtctx->bitstream_size = 0;
144
145     if (h->is_avc == 1) {
146         return videotoolbox_buffer_copy(vtctx, buffer, size);
147     }
148
149     return 0;
150 }
151
152 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
153                                       const uint8_t *buffer,
154                                       uint32_t size)
155 {
156     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
157     H264Context *h  = avctx->priv_data;
158     void *tmp;
159
160     if (h->is_avc == 1)
161         return 0;
162
163     tmp = av_fast_realloc(vtctx->bitstream,
164                           &vtctx->allocated_size,
165                           vtctx->bitstream_size+size+4);
166     if (!tmp)
167         return AVERROR(ENOMEM);
168
169     vtctx->bitstream = tmp;
170
171     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
172     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
173
174     vtctx->bitstream_size += size + 4;
175
176     return 0;
177 }
178
179 int ff_videotoolbox_uninit(AVCodecContext *avctx)
180 {
181     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
182     if (vtctx) {
183         av_freep(&vtctx->bitstream);
184         if (vtctx->frame)
185             CVPixelBufferRelease(vtctx->frame);
186     }
187
188     return 0;
189 }
190
191 #if CONFIG_VIDEOTOOLBOX
192 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
193 {
194     int i;
195     uint8_t b;
196
197     for (i = 3; i >= 0; i--) {
198         b = (length >> (i * 7)) & 0x7F;
199         if (i != 0)
200             b |= 0x80;
201
202         bytestream2_put_byteu(pb, b);
203     }
204 }
205
206 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
207 {
208     CFDataRef data;
209     uint8_t *rw_extradata;
210     PutByteContext pb;
211     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
212     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
213     int config_size = 13 + 5 + avctx->extradata_size;
214     int s;
215
216     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
217         return NULL;
218
219     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
220     bytestream2_put_byteu(&pb, 0);        // version
221     bytestream2_put_ne24(&pb, 0);         // flags
222
223     // elementary stream descriptor
224     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
225     videotoolbox_write_mp4_descr_length(&pb, full_size);
226     bytestream2_put_ne16(&pb, 0);         // esid
227     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
228
229     // decoder configuration descriptor
230     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
231     videotoolbox_write_mp4_descr_length(&pb, config_size);
232     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
233     bytestream2_put_byteu(&pb, 0x11);     // stream type
234     bytestream2_put_ne24(&pb, 0);         // buffer size
235     bytestream2_put_ne32(&pb, 0);         // max bitrate
236     bytestream2_put_ne32(&pb, 0);         // avg bitrate
237
238     // decoder specific descriptor
239     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
240     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
241
242     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
243
244     // SLConfigDescriptor
245     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
246     bytestream2_put_byteu(&pb, 0x01);     // length
247     bytestream2_put_byteu(&pb, 0x02);     //
248
249     s = bytestream2_size_p(&pb);
250
251     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
252
253     av_freep(&rw_extradata);
254     return data;
255 }
256
257 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
258                                                            void *buffer,
259                                                            int size)
260 {
261     OSStatus status;
262     CMBlockBufferRef  block_buf;
263     CMSampleBufferRef sample_buf;
264
265     block_buf  = NULL;
266     sample_buf = NULL;
267
268     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
269                                                 buffer,             // memoryBlock
270                                                 size,               // blockLength
271                                                 kCFAllocatorNull,   // blockAllocator
272                                                 NULL,               // customBlockSource
273                                                 0,                  // offsetToData
274                                                 size,               // dataLength
275                                                 0,                  // flags
276                                                 &block_buf);
277
278     if (!status) {
279         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
280                                       block_buf,            // dataBuffer
281                                       TRUE,                 // dataReady
282                                       0,                    // makeDataReadyCallback
283                                       0,                    // makeDataReadyRefcon
284                                       fmt_desc,             // formatDescription
285                                       1,                    // numSamples
286                                       0,                    // numSampleTimingEntries
287                                       NULL,                 // sampleTimingArray
288                                       0,                    // numSampleSizeEntries
289                                       NULL,                 // sampleSizeArray
290                                       &sample_buf);
291     }
292
293     if (block_buf)
294         CFRelease(block_buf);
295
296     return sample_buf;
297 }
298
299 static void videotoolbox_decoder_callback(void *opaque,
300                                           void *sourceFrameRefCon,
301                                           OSStatus status,
302                                           VTDecodeInfoFlags flags,
303                                           CVImageBufferRef image_buffer,
304                                           CMTime pts,
305                                           CMTime duration)
306 {
307     AVCodecContext *avctx = opaque;
308     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
309
310     if (vtctx->frame) {
311         CVPixelBufferRelease(vtctx->frame);
312         vtctx->frame = NULL;
313     }
314
315     if (!image_buffer) {
316         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
317         return;
318     }
319
320     vtctx->frame = CVPixelBufferRetain(image_buffer);
321 }
322
323 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
324 {
325     OSStatus status;
326     CMSampleBufferRef sample_buf;
327     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
328     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
329
330     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
331                                                    vtctx->bitstream,
332                                                    vtctx->bitstream_size);
333
334     if (!sample_buf)
335         return -1;
336
337     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
338                                                sample_buf,
339                                                0,       // decodeFlags
340                                                NULL,    // sourceFrameRefCon
341                                                0);      // infoFlagsOut
342     if (status == noErr)
343         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
344
345     CFRelease(sample_buf);
346
347     return status;
348 }
349
350 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
351 {
352     int status;
353     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
354     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
355
356     if (!videotoolbox->session || !vtctx->bitstream)
357         return AVERROR_INVALIDDATA;
358
359     status = videotoolbox_session_decode_frame(avctx);
360
361     if (status) {
362         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
363         return AVERROR_UNKNOWN;
364     }
365
366     if (!vtctx->frame)
367         return AVERROR_UNKNOWN;
368
369     return ff_videotoolbox_buffer_create(vtctx, frame);
370 }
371
372 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
373 {
374     H264Context *h = avctx->priv_data;
375     AVFrame *frame = h->cur_pic_ptr->f;
376
377     return videotoolbox_common_end_frame(avctx, frame);
378 }
379
380 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
381                                          const uint8_t *buffer,
382                                          uint32_t size)
383 {
384     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
385
386     return videotoolbox_buffer_copy(vtctx, buffer, size);
387 }
388
389 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
390                                           const uint8_t *buffer,
391                                           uint32_t size)
392 {
393     return 0;
394 }
395
396 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
397 {
398     MpegEncContext *s = avctx->priv_data;
399     AVFrame *frame = s->current_picture_ptr->f;
400
401     return videotoolbox_common_end_frame(avctx, frame);
402 }
403
404 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
405                                                           AVCodecContext *avctx)
406 {
407     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
408                                                                    1,
409                                                                    &kCFTypeDictionaryKeyCallBacks,
410                                                                    &kCFTypeDictionaryValueCallBacks);
411
412     CFDictionarySetValue(config_info,
413                          kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
414                          kCFBooleanTrue);
415
416     if (avctx->extradata_size) {
417         CFMutableDictionaryRef avc_info;
418         CFDataRef data = NULL;
419
420         avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
421                                              1,
422                                              &kCFTypeDictionaryKeyCallBacks,
423                                              &kCFTypeDictionaryValueCallBacks);
424
425         switch (codec_type) {
426         case kCMVideoCodecType_MPEG4Video :
427             data = videotoolbox_esds_extradata_create(avctx);
428             if (data)
429                 CFDictionarySetValue(avc_info, CFSTR("esds"), data);
430             break;
431         case kCMVideoCodecType_H264 :
432             data = ff_videotoolbox_avcc_extradata_create(avctx);
433             if (data)
434                 CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
435             break;
436         default:
437             break;
438         }
439
440         CFDictionarySetValue(config_info,
441                 kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
442                 avc_info);
443
444         if (data)
445             CFRelease(data);
446
447         CFRelease(avc_info);
448     }
449     return config_info;
450 }
451
452 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
453                                                              int height,
454                                                              OSType pix_fmt)
455 {
456     CFMutableDictionaryRef buffer_attributes;
457     CFMutableDictionaryRef io_surface_properties;
458     CFNumberRef cv_pix_fmt;
459     CFNumberRef w;
460     CFNumberRef h;
461
462     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
463     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
464     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
465
466     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
467                                                   4,
468                                                   &kCFTypeDictionaryKeyCallBacks,
469                                                   &kCFTypeDictionaryValueCallBacks);
470     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
471                                                       0,
472                                                       &kCFTypeDictionaryKeyCallBacks,
473                                                       &kCFTypeDictionaryValueCallBacks);
474
475     CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
476     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
477     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
478     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
479
480     CFRelease(io_surface_properties);
481     CFRelease(cv_pix_fmt);
482     CFRelease(w);
483     CFRelease(h);
484
485     return buffer_attributes;
486 }
487
488 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
489                                                                    CFDictionaryRef decoder_spec,
490                                                                    int width,
491                                                                    int height)
492 {
493     CMFormatDescriptionRef cm_fmt_desc;
494     OSStatus status;
495
496     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
497                                             codec_type,
498                                             width,
499                                             height,
500                                             decoder_spec, // Dictionary of extension
501                                             &cm_fmt_desc);
502
503     if (status)
504         return NULL;
505
506     return cm_fmt_desc;
507 }
508
509 static int videotoolbox_default_init(AVCodecContext *avctx)
510 {
511     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
512     OSStatus status;
513     VTDecompressionOutputCallbackRecord decoder_cb;
514     CFDictionaryRef decoder_spec;
515     CFDictionaryRef buf_attr;
516
517     if (!videotoolbox) {
518         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
519         return -1;
520     }
521
522     switch( avctx->codec_id ) {
523     case AV_CODEC_ID_H263 :
524         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
525         break;
526     case AV_CODEC_ID_H264 :
527         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
528         break;
529     case AV_CODEC_ID_MPEG1VIDEO :
530         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
531         break;
532     case AV_CODEC_ID_MPEG2VIDEO :
533         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
534         break;
535     case AV_CODEC_ID_MPEG4 :
536         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
537         break;
538     default :
539         break;
540     }
541
542     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
543
544     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
545                                                                 decoder_spec,
546                                                                 avctx->width,
547                                                                 avctx->height);
548     if (!videotoolbox->cm_fmt_desc) {
549         if (decoder_spec)
550             CFRelease(decoder_spec);
551
552         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
553         return -1;
554     }
555
556     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
557                                                      avctx->height,
558                                                      videotoolbox->cv_pix_fmt_type);
559
560     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
561     decoder_cb.decompressionOutputRefCon   = avctx;
562
563     status = VTDecompressionSessionCreate(NULL,                      // allocator
564                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
565                                           decoder_spec,              // videoDecoderSpecification
566                                           buf_attr,                  // destinationImageBufferAttributes
567                                           &decoder_cb,               // outputCallback
568                                           &videotoolbox->session);   // decompressionSessionOut
569
570     if (decoder_spec)
571         CFRelease(decoder_spec);
572     if (buf_attr)
573         CFRelease(buf_attr);
574
575     switch (status) {
576     case kVTVideoDecoderNotAvailableNowErr:
577     case kVTVideoDecoderUnsupportedDataFormatErr:
578         return AVERROR(ENOSYS);
579     case kVTVideoDecoderMalfunctionErr:
580         return AVERROR(EINVAL);
581     case kVTVideoDecoderBadDataErr :
582         return AVERROR_INVALIDDATA;
583     case 0:
584         return 0;
585     default:
586         return AVERROR_UNKNOWN;
587     }
588 }
589
590 static void videotoolbox_default_free(AVCodecContext *avctx)
591 {
592     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
593
594     if (videotoolbox) {
595         if (videotoolbox->cm_fmt_desc)
596             CFRelease(videotoolbox->cm_fmt_desc);
597
598         if (videotoolbox->session)
599             VTDecompressionSessionInvalidate(videotoolbox->session);
600     }
601 }
602
603 AVHWAccel ff_h263_videotoolbox_hwaccel = {
604     .name           = "h263_videotoolbox",
605     .type           = AVMEDIA_TYPE_VIDEO,
606     .id             = AV_CODEC_ID_H263,
607     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
608     .alloc_frame    = ff_videotoolbox_alloc_frame,
609     .start_frame    = videotoolbox_mpeg_start_frame,
610     .decode_slice   = videotoolbox_mpeg_decode_slice,
611     .end_frame      = videotoolbox_mpeg_end_frame,
612     .uninit         = ff_videotoolbox_uninit,
613     .priv_data_size = sizeof(VTContext),
614 };
615
616 AVHWAccel ff_h264_videotoolbox_hwaccel = {
617     .name           = "h264_videotoolbox",
618     .type           = AVMEDIA_TYPE_VIDEO,
619     .id             = AV_CODEC_ID_H264,
620     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
621     .alloc_frame    = ff_videotoolbox_alloc_frame,
622     .start_frame    = ff_videotoolbox_h264_start_frame,
623     .decode_slice   = ff_videotoolbox_h264_decode_slice,
624     .end_frame      = videotoolbox_h264_end_frame,
625     .uninit         = ff_videotoolbox_uninit,
626     .priv_data_size = sizeof(VTContext),
627 };
628
629 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
630     .name           = "mpeg1_videotoolbox",
631     .type           = AVMEDIA_TYPE_VIDEO,
632     .id             = AV_CODEC_ID_MPEG1VIDEO,
633     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
634     .alloc_frame    = ff_videotoolbox_alloc_frame,
635     .start_frame    = videotoolbox_mpeg_start_frame,
636     .decode_slice   = videotoolbox_mpeg_decode_slice,
637     .end_frame      = videotoolbox_mpeg_end_frame,
638     .uninit         = ff_videotoolbox_uninit,
639     .priv_data_size = sizeof(VTContext),
640 };
641
642 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
643     .name           = "mpeg2_videotoolbox",
644     .type           = AVMEDIA_TYPE_VIDEO,
645     .id             = AV_CODEC_ID_MPEG2VIDEO,
646     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
647     .alloc_frame    = ff_videotoolbox_alloc_frame,
648     .start_frame    = videotoolbox_mpeg_start_frame,
649     .decode_slice   = videotoolbox_mpeg_decode_slice,
650     .end_frame      = videotoolbox_mpeg_end_frame,
651     .uninit         = ff_videotoolbox_uninit,
652     .priv_data_size = sizeof(VTContext),
653 };
654
655 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
656     .name           = "mpeg4_videotoolbox",
657     .type           = AVMEDIA_TYPE_VIDEO,
658     .id             = AV_CODEC_ID_MPEG4,
659     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
660     .alloc_frame    = ff_videotoolbox_alloc_frame,
661     .start_frame    = videotoolbox_mpeg_start_frame,
662     .decode_slice   = videotoolbox_mpeg_decode_slice,
663     .end_frame      = videotoolbox_mpeg_end_frame,
664     .uninit         = ff_videotoolbox_uninit,
665     .priv_data_size = sizeof(VTContext),
666 };
667
668 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
669 {
670     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
671
672     if (ret) {
673         ret->output_callback = videotoolbox_decoder_callback;
674         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
675     }
676
677     return ret;
678 }
679
680 int av_videotoolbox_default_init(AVCodecContext *avctx)
681 {
682     return av_videotoolbox_default_init2(avctx, NULL);
683 }
684
685 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
686 {
687     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
688     if (!avctx->hwaccel_context)
689         return AVERROR(ENOMEM);
690     return videotoolbox_default_init(avctx);
691 }
692
693 void av_videotoolbox_default_free(AVCodecContext *avctx)
694 {
695
696     videotoolbox_default_free(avctx);
697     av_freep(&avctx->hwaccel_context);
698 }
699 #endif /* CONFIG_VIDEOTOOLBOX */