avcodec/videotoolbox: Add missing AV_ prefix to CODEC_ID in comment
[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_EnableHardwareAcceleratedVideoDecoder
36 #  define kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder CFSTR("EnableHardwareAcceleratedVideoDecoder")
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 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
81 {
82     CFDataRef data = NULL;
83
84     /* Each VCL NAL in the bitstream sent to the decoder
85      * is preceded by a 4 bytes length header.
86      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
87     if (avctx->extradata_size >= 4 && (avctx->extradata[4] & 0x03) != 0x03) {
88         uint8_t *rw_extradata = av_memdup(avctx->extradata, avctx->extradata_size);
89
90         if (!rw_extradata)
91             return NULL;
92
93         rw_extradata[4] |= 0x03;
94
95         data = CFDataCreate(kCFAllocatorDefault, rw_extradata, avctx->extradata_size);
96
97         av_freep(&rw_extradata);
98     } else {
99         data = CFDataCreate(kCFAllocatorDefault, avctx->extradata, avctx->extradata_size);
100     }
101
102     return data;
103 }
104
105 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
106 {
107     av_buffer_unref(&frame->buf[0]);
108
109     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
110                                      sizeof(vtctx->frame),
111                                      videotoolbox_buffer_release,
112                                      NULL,
113                                      AV_BUFFER_FLAG_READONLY);
114     if (!frame->buf[0]) {
115         return AVERROR(ENOMEM);
116     }
117
118     frame->data[3] = (uint8_t*)vtctx->frame;
119     vtctx->frame = NULL;
120
121     return 0;
122 }
123
124 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
125                                      const uint8_t *buffer,
126                                      uint32_t size)
127 {
128     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
129     H264Context *h  = avctx->priv_data;
130
131     vtctx->bitstream_size = 0;
132
133     if (h->is_avc == 1) {
134         return videotoolbox_buffer_copy(vtctx, buffer, size);
135     }
136
137     return 0;
138 }
139
140 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
141                                       const uint8_t *buffer,
142                                       uint32_t size)
143 {
144     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
145     H264Context *h  = avctx->priv_data;
146     void *tmp;
147
148     if (h->is_avc == 1)
149         return 0;
150
151     tmp = av_fast_realloc(vtctx->bitstream,
152                           &vtctx->allocated_size,
153                           vtctx->bitstream_size+size+4);
154     if (!tmp)
155         return AVERROR(ENOMEM);
156
157     vtctx->bitstream = tmp;
158
159     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
160     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
161
162     vtctx->bitstream_size += size + 4;
163
164     return 0;
165 }
166
167 int ff_videotoolbox_uninit(AVCodecContext *avctx)
168 {
169     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
170     if (vtctx) {
171         av_freep(&vtctx->bitstream);
172         if (vtctx->frame)
173             CVPixelBufferRelease(vtctx->frame);
174     }
175
176     return 0;
177 }
178
179 #if CONFIG_VIDEOTOOLBOX
180 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
181 {
182     int i;
183     uint8_t b;
184
185     for (i = 3; i >= 0; i--) {
186         b = (length >> (i * 7)) & 0x7F;
187         if (i != 0)
188             b |= 0x80;
189
190         bytestream2_put_byteu(pb, b);
191     }
192 }
193
194 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
195 {
196     CFDataRef data;
197     uint8_t *rw_extradata;
198     PutByteContext pb;
199     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
200     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
201     int config_size = 13 + 5 + avctx->extradata_size;
202     int s;
203
204     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
205         return NULL;
206
207     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
208     bytestream2_put_byteu(&pb, 0);        // version
209     bytestream2_put_ne24(&pb, 0);         // flags
210
211     // elementary stream descriptor
212     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
213     videotoolbox_write_mp4_descr_length(&pb, full_size);
214     bytestream2_put_ne16(&pb, 0);         // esid
215     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
216
217     // decoder configuration descriptor
218     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
219     videotoolbox_write_mp4_descr_length(&pb, config_size);
220     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
221     bytestream2_put_byteu(&pb, 0x11);     // stream type
222     bytestream2_put_ne24(&pb, 0);         // buffer size
223     bytestream2_put_ne32(&pb, 0);         // max bitrate
224     bytestream2_put_ne32(&pb, 0);         // avg bitrate
225
226     // decoder specific descriptor
227     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
228     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
229
230     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
231
232     // SLConfigDescriptor
233     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
234     bytestream2_put_byteu(&pb, 0x01);     // length
235     bytestream2_put_byteu(&pb, 0x02);     //
236
237     s = bytestream2_size_p(&pb);
238
239     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
240
241     av_freep(&rw_extradata);
242     return data;
243 }
244
245 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
246                                                            void *buffer,
247                                                            int size)
248 {
249     OSStatus status;
250     CMBlockBufferRef  block_buf;
251     CMSampleBufferRef sample_buf;
252
253     block_buf  = NULL;
254     sample_buf = NULL;
255
256     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
257                                                 buffer,             // memoryBlock
258                                                 size,               // blockLength
259                                                 kCFAllocatorNull,   // blockAllocator
260                                                 NULL,               // customBlockSource
261                                                 0,                  // offsetToData
262                                                 size,               // dataLength
263                                                 0,                  // flags
264                                                 &block_buf);
265
266     if (!status) {
267         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
268                                       block_buf,            // dataBuffer
269                                       TRUE,                 // dataReady
270                                       0,                    // makeDataReadyCallback
271                                       0,                    // makeDataReadyRefcon
272                                       fmt_desc,             // formatDescription
273                                       1,                    // numSamples
274                                       0,                    // numSampleTimingEntries
275                                       NULL,                 // sampleTimingArray
276                                       0,                    // numSampleSizeEntries
277                                       NULL,                 // sampleSizeArray
278                                       &sample_buf);
279     }
280
281     if (block_buf)
282         CFRelease(block_buf);
283
284     return sample_buf;
285 }
286
287 static void videotoolbox_decoder_callback(void *opaque,
288                                           void *sourceFrameRefCon,
289                                           OSStatus status,
290                                           VTDecodeInfoFlags flags,
291                                           CVImageBufferRef image_buffer,
292                                           CMTime pts,
293                                           CMTime duration)
294 {
295     AVCodecContext *avctx = opaque;
296     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
297
298     if (vtctx->frame) {
299         CVPixelBufferRelease(vtctx->frame);
300         vtctx->frame = NULL;
301     }
302
303     if (!image_buffer) {
304         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
305         return;
306     }
307
308     vtctx->frame = CVPixelBufferRetain(image_buffer);
309 }
310
311 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
312 {
313     OSStatus status;
314     CMSampleBufferRef sample_buf;
315     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
316     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
317
318     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
319                                                    vtctx->bitstream,
320                                                    vtctx->bitstream_size);
321
322     if (!sample_buf)
323         return -1;
324
325     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
326                                                sample_buf,
327                                                0,       // decodeFlags
328                                                NULL,    // sourceFrameRefCon
329                                                0);      // infoFlagsOut
330     if (status == noErr)
331         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
332
333     CFRelease(sample_buf);
334
335     return status;
336 }
337
338 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
339 {
340     int status;
341     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
342     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
343
344     if (!videotoolbox->session || !vtctx->bitstream)
345         return AVERROR_INVALIDDATA;
346
347     status = videotoolbox_session_decode_frame(avctx);
348
349     if (status) {
350         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
351         return AVERROR_UNKNOWN;
352     }
353
354     if (!vtctx->frame)
355         return AVERROR_UNKNOWN;
356
357     return ff_videotoolbox_buffer_create(vtctx, frame);
358 }
359
360 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
361 {
362     H264Context *h = avctx->priv_data;
363     AVFrame *frame = h->cur_pic_ptr->f;
364
365     return videotoolbox_common_end_frame(avctx, frame);
366 }
367
368 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
369                                          const uint8_t *buffer,
370                                          uint32_t size)
371 {
372     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
373
374     return videotoolbox_buffer_copy(vtctx, buffer, size);
375 }
376
377 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
378                                           const uint8_t *buffer,
379                                           uint32_t size)
380 {
381     return 0;
382 }
383
384 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
385 {
386     MpegEncContext *s = avctx->priv_data;
387     AVFrame *frame = s->current_picture_ptr->f;
388
389     return videotoolbox_common_end_frame(avctx, frame);
390 }
391
392 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
393                                                           AVCodecContext *avctx)
394 {
395     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
396                                                                    1,
397                                                                    &kCFTypeDictionaryKeyCallBacks,
398                                                                    &kCFTypeDictionaryValueCallBacks);
399
400     CFDictionarySetValue(config_info,
401                          kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder,
402                          kCFBooleanTrue);
403
404     if (avctx->extradata_size) {
405         CFMutableDictionaryRef avc_info;
406         CFDataRef data = NULL;
407
408         avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
409                                              1,
410                                              &kCFTypeDictionaryKeyCallBacks,
411                                              &kCFTypeDictionaryValueCallBacks);
412
413         switch (codec_type) {
414         case kCMVideoCodecType_MPEG4Video :
415             data = videotoolbox_esds_extradata_create(avctx);
416             if (data)
417                 CFDictionarySetValue(avc_info, CFSTR("esds"), data);
418             break;
419         case kCMVideoCodecType_H264 :
420             data = ff_videotoolbox_avcc_extradata_create(avctx);
421             if (data)
422                 CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
423             break;
424         default:
425             break;
426         }
427
428         CFDictionarySetValue(config_info,
429                 kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
430                 avc_info);
431
432         if (data)
433             CFRelease(data);
434
435         CFRelease(avc_info);
436     }
437     return config_info;
438 }
439
440 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
441                                                              int height,
442                                                              OSType pix_fmt)
443 {
444     CFMutableDictionaryRef buffer_attributes;
445     CFMutableDictionaryRef io_surface_properties;
446     CFNumberRef cv_pix_fmt;
447     CFNumberRef w;
448     CFNumberRef h;
449
450     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
451     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
452     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
453
454     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
455                                                   4,
456                                                   &kCFTypeDictionaryKeyCallBacks,
457                                                   &kCFTypeDictionaryValueCallBacks);
458     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
459                                                       0,
460                                                       &kCFTypeDictionaryKeyCallBacks,
461                                                       &kCFTypeDictionaryValueCallBacks);
462
463     CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
464     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
465     CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);
466     CFDictionarySetValue(buffer_attributes, kCVPixelBufferHeightKey, h);
467
468     CFRelease(io_surface_properties);
469     CFRelease(cv_pix_fmt);
470     CFRelease(w);
471     CFRelease(h);
472
473     return buffer_attributes;
474 }
475
476 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
477                                                                    CFDictionaryRef decoder_spec,
478                                                                    int width,
479                                                                    int height)
480 {
481     CMFormatDescriptionRef cm_fmt_desc;
482     OSStatus status;
483
484     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
485                                             codec_type,
486                                             width,
487                                             height,
488                                             decoder_spec, // Dictionary of extension
489                                             &cm_fmt_desc);
490
491     if (status)
492         return NULL;
493
494     return cm_fmt_desc;
495 }
496
497 static int videotoolbox_default_init(AVCodecContext *avctx)
498 {
499     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
500     OSStatus status;
501     VTDecompressionOutputCallbackRecord decoder_cb;
502     CFDictionaryRef decoder_spec;
503     CFDictionaryRef buf_attr;
504     int32_t pix_fmt;
505
506     if (!videotoolbox) {
507         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
508         return -1;
509     }
510
511     switch( avctx->codec_id ) {
512     case AV_CODEC_ID_H263 :
513         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
514         break;
515     case AV_CODEC_ID_H264 :
516         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
517         break;
518     case AV_CODEC_ID_MPEG1VIDEO :
519         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
520         break;
521     case AV_CODEC_ID_MPEG2VIDEO :
522         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
523         break;
524     case AV_CODEC_ID_MPEG4 :
525         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
526         break;
527     default :
528         break;
529     }
530
531     pix_fmt = videotoolbox->cv_pix_fmt_type;
532
533     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
534
535     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
536                                                                 decoder_spec,
537                                                                 avctx->width,
538                                                                 avctx->height);
539     if (!videotoolbox->cm_fmt_desc) {
540         if (decoder_spec)
541             CFRelease(decoder_spec);
542
543         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
544         return -1;
545     }
546
547     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
548                                                      avctx->height,
549                                                      videotoolbox->cv_pix_fmt_type);
550
551     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
552     decoder_cb.decompressionOutputRefCon   = avctx;
553
554     status = VTDecompressionSessionCreate(NULL,                      // allocator
555                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
556                                           decoder_spec,              // videoDecoderSpecification
557                                           buf_attr,                  // destinationImageBufferAttributes
558                                           &decoder_cb,               // outputCallback
559                                           &videotoolbox->session);   // decompressionSessionOut
560
561     if (decoder_spec)
562         CFRelease(decoder_spec);
563     if (buf_attr)
564         CFRelease(buf_attr);
565
566     switch (status) {
567     case kVTVideoDecoderNotAvailableNowErr:
568     case kVTVideoDecoderUnsupportedDataFormatErr:
569         return AVERROR(ENOSYS);
570     case kVTVideoDecoderMalfunctionErr:
571         return AVERROR(EINVAL);
572     case kVTVideoDecoderBadDataErr :
573         return AVERROR_INVALIDDATA;
574     case 0:
575         return 0;
576     default:
577         return AVERROR_UNKNOWN;
578     }
579 }
580
581 static void videotoolbox_default_free(AVCodecContext *avctx)
582 {
583     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
584
585     if (videotoolbox) {
586         if (videotoolbox->cm_fmt_desc)
587             CFRelease(videotoolbox->cm_fmt_desc);
588
589         if (videotoolbox->session)
590             VTDecompressionSessionInvalidate(videotoolbox->session);
591     }
592 }
593
594 AVHWAccel ff_h263_videotoolbox_hwaccel = {
595     .name           = "h263_videotoolbox",
596     .type           = AVMEDIA_TYPE_VIDEO,
597     .id             = AV_CODEC_ID_H263,
598     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
599     .alloc_frame    = ff_videotoolbox_alloc_frame,
600     .start_frame    = videotoolbox_mpeg_start_frame,
601     .decode_slice   = videotoolbox_mpeg_decode_slice,
602     .end_frame      = videotoolbox_mpeg_end_frame,
603     .uninit         = ff_videotoolbox_uninit,
604     .priv_data_size = sizeof(VTContext),
605 };
606
607 AVHWAccel ff_h264_videotoolbox_hwaccel = {
608     .name           = "h264_videotoolbox",
609     .type           = AVMEDIA_TYPE_VIDEO,
610     .id             = AV_CODEC_ID_H264,
611     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
612     .alloc_frame    = ff_videotoolbox_alloc_frame,
613     .start_frame    = ff_videotoolbox_h264_start_frame,
614     .decode_slice   = ff_videotoolbox_h264_decode_slice,
615     .end_frame      = videotoolbox_h264_end_frame,
616     .uninit         = ff_videotoolbox_uninit,
617     .priv_data_size = sizeof(VTContext),
618 };
619
620 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
621     .name           = "mpeg1_videotoolbox",
622     .type           = AVMEDIA_TYPE_VIDEO,
623     .id             = AV_CODEC_ID_MPEG1VIDEO,
624     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
625     .alloc_frame    = ff_videotoolbox_alloc_frame,
626     .start_frame    = videotoolbox_mpeg_start_frame,
627     .decode_slice   = videotoolbox_mpeg_decode_slice,
628     .end_frame      = videotoolbox_mpeg_end_frame,
629     .uninit         = ff_videotoolbox_uninit,
630     .priv_data_size = sizeof(VTContext),
631 };
632
633 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
634     .name           = "mpeg2_videotoolbox",
635     .type           = AVMEDIA_TYPE_VIDEO,
636     .id             = AV_CODEC_ID_MPEG2VIDEO,
637     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
638     .alloc_frame    = ff_videotoolbox_alloc_frame,
639     .start_frame    = videotoolbox_mpeg_start_frame,
640     .decode_slice   = videotoolbox_mpeg_decode_slice,
641     .end_frame      = videotoolbox_mpeg_end_frame,
642     .uninit         = ff_videotoolbox_uninit,
643     .priv_data_size = sizeof(VTContext),
644 };
645
646 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
647     .name           = "mpeg4_videotoolbox",
648     .type           = AVMEDIA_TYPE_VIDEO,
649     .id             = AV_CODEC_ID_MPEG4,
650     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
651     .alloc_frame    = ff_videotoolbox_alloc_frame,
652     .start_frame    = videotoolbox_mpeg_start_frame,
653     .decode_slice   = videotoolbox_mpeg_decode_slice,
654     .end_frame      = videotoolbox_mpeg_end_frame,
655     .uninit         = ff_videotoolbox_uninit,
656     .priv_data_size = sizeof(VTContext),
657 };
658
659 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
660 {
661     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
662
663     if (ret) {
664         ret->output_callback = videotoolbox_decoder_callback;
665         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
666     }
667
668     return ret;
669 }
670
671 int av_videotoolbox_default_init(AVCodecContext *avctx)
672 {
673     return av_videotoolbox_default_init2(avctx, NULL);
674 }
675
676 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
677 {
678     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
679     if (!avctx->hwaccel_context)
680         return AVERROR(ENOMEM);
681     return videotoolbox_default_init(avctx);
682 }
683
684 void av_videotoolbox_default_free(AVCodecContext *avctx)
685 {
686
687     videotoolbox_default_free(avctx);
688     av_freep(&avctx->hwaccel_context);
689 }
690 #endif /* CONFIG_VIDEOTOOLBOX */