avcodec/h264, videotoolbox: fix crash after VT decoder fails
[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 "h264dec.h"
33 #include "mpegvideo.h"
34 #include <TargetConditionals.h>
35
36 #ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
37 #  define kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder CFSTR("RequireHardwareAcceleratedVideoDecoder")
38 #endif
39
40 #define VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING  12
41
42 static void videotoolbox_buffer_release(void *opaque, uint8_t *data)
43 {
44     CVPixelBufferRef cv_buffer = (CVImageBufferRef)data;
45     CVPixelBufferRelease(cv_buffer);
46 }
47
48 static int videotoolbox_buffer_copy(VTContext *vtctx,
49                                     const uint8_t *buffer,
50                                     uint32_t size)
51 {
52     void *tmp;
53
54     tmp = av_fast_realloc(vtctx->bitstream,
55                          &vtctx->allocated_size,
56                          size);
57
58     if (!tmp)
59         return AVERROR(ENOMEM);
60
61     vtctx->bitstream = tmp;
62     memcpy(vtctx->bitstream, buffer, size);
63     vtctx->bitstream_size = size;
64
65     return 0;
66 }
67
68 int ff_videotoolbox_alloc_frame(AVCodecContext *avctx, AVFrame *frame)
69 {
70     frame->width  = avctx->width;
71     frame->height = avctx->height;
72     frame->format = avctx->pix_fmt;
73     frame->buf[0] = av_buffer_alloc(1);
74
75     if (!frame->buf[0])
76         return AVERROR(ENOMEM);
77
78     return 0;
79 }
80
81 #define AV_W8(p, v) *(p) = (v)
82
83 CFDataRef ff_videotoolbox_avcc_extradata_create(AVCodecContext *avctx)
84 {
85     H264Context *h     = avctx->priv_data;
86     CFDataRef data = NULL;
87     uint8_t *p;
88     int vt_extradata_size = 6 + 2 + h->ps.sps->data_size + 3 + h->ps.pps->data_size;
89     uint8_t *vt_extradata = av_malloc(vt_extradata_size);
90     if (!vt_extradata)
91         return NULL;
92
93     p = vt_extradata;
94
95     AV_W8(p + 0, 1); /* version */
96     AV_W8(p + 1, h->ps.sps->data[1]); /* profile */
97     AV_W8(p + 2, h->ps.sps->data[2]); /* profile compat */
98     AV_W8(p + 3, h->ps.sps->data[3]); /* level */
99     AV_W8(p + 4, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 3 (11) */
100     AV_W8(p + 5, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
101     AV_WB16(p + 6, h->ps.sps->data_size);
102     memcpy(p + 8, h->ps.sps->data, h->ps.sps->data_size);
103     p += 8 + h->ps.sps->data_size;
104     AV_W8(p + 0, 1); /* number of pps */
105     AV_WB16(p + 1, h->ps.pps->data_size);
106     memcpy(p + 3, h->ps.pps->data, h->ps.pps->data_size);
107
108     p += 3 + h->ps.pps->data_size;
109     av_assert0(p - vt_extradata == vt_extradata_size);
110
111     data = CFDataCreate(kCFAllocatorDefault, vt_extradata, vt_extradata_size);
112     av_free(vt_extradata);
113     return data;
114 }
115
116 int ff_videotoolbox_buffer_create(VTContext *vtctx, AVFrame *frame)
117 {
118     av_buffer_unref(&frame->buf[0]);
119
120     frame->buf[0] = av_buffer_create((uint8_t*)vtctx->frame,
121                                      sizeof(vtctx->frame),
122                                      videotoolbox_buffer_release,
123                                      NULL,
124                                      AV_BUFFER_FLAG_READONLY);
125     if (!frame->buf[0]) {
126         return AVERROR(ENOMEM);
127     }
128
129     frame->data[3] = (uint8_t*)vtctx->frame;
130     vtctx->frame = NULL;
131
132     return 0;
133 }
134
135 int ff_videotoolbox_h264_start_frame(AVCodecContext *avctx,
136                                      const uint8_t *buffer,
137                                      uint32_t size)
138 {
139     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
140     H264Context *h  = avctx->priv_data;
141
142     vtctx->bitstream_size = 0;
143
144     if (h->is_avc == 1) {
145         return videotoolbox_buffer_copy(vtctx, buffer, size);
146     }
147
148     return 0;
149 }
150
151 int ff_videotoolbox_h264_decode_slice(AVCodecContext *avctx,
152                                       const uint8_t *buffer,
153                                       uint32_t size)
154 {
155     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
156     H264Context *h  = avctx->priv_data;
157     void *tmp;
158
159     if (h->is_avc == 1)
160         return 0;
161
162     tmp = av_fast_realloc(vtctx->bitstream,
163                           &vtctx->allocated_size,
164                           vtctx->bitstream_size+size+4);
165     if (!tmp)
166         return AVERROR(ENOMEM);
167
168     vtctx->bitstream = tmp;
169
170     AV_WB32(vtctx->bitstream + vtctx->bitstream_size, size);
171     memcpy(vtctx->bitstream + vtctx->bitstream_size + 4, buffer, size);
172
173     vtctx->bitstream_size += size + 4;
174
175     return 0;
176 }
177
178 int ff_videotoolbox_uninit(AVCodecContext *avctx)
179 {
180     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
181     if (vtctx) {
182         av_freep(&vtctx->bitstream);
183         if (vtctx->frame)
184             CVPixelBufferRelease(vtctx->frame);
185     }
186
187     return 0;
188 }
189
190 #if CONFIG_VIDEOTOOLBOX
191 static void videotoolbox_write_mp4_descr_length(PutByteContext *pb, int length)
192 {
193     int i;
194     uint8_t b;
195
196     for (i = 3; i >= 0; i--) {
197         b = (length >> (i * 7)) & 0x7F;
198         if (i != 0)
199             b |= 0x80;
200
201         bytestream2_put_byteu(pb, b);
202     }
203 }
204
205 static CFDataRef videotoolbox_esds_extradata_create(AVCodecContext *avctx)
206 {
207     CFDataRef data;
208     uint8_t *rw_extradata;
209     PutByteContext pb;
210     int full_size = 3 + 5 + 13 + 5 + avctx->extradata_size + 3;
211     // ES_DescrTag data + DecoderConfigDescrTag + data + DecSpecificInfoTag + size + SLConfigDescriptor
212     int config_size = 13 + 5 + avctx->extradata_size;
213     int s;
214
215     if (!(rw_extradata = av_mallocz(full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING)))
216         return NULL;
217
218     bytestream2_init_writer(&pb, rw_extradata, full_size + VIDEOTOOLBOX_ESDS_EXTRADATA_PADDING);
219     bytestream2_put_byteu(&pb, 0);        // version
220     bytestream2_put_ne24(&pb, 0);         // flags
221
222     // elementary stream descriptor
223     bytestream2_put_byteu(&pb, 0x03);     // ES_DescrTag
224     videotoolbox_write_mp4_descr_length(&pb, full_size);
225     bytestream2_put_ne16(&pb, 0);         // esid
226     bytestream2_put_byteu(&pb, 0);        // stream priority (0-32)
227
228     // decoder configuration descriptor
229     bytestream2_put_byteu(&pb, 0x04);     // DecoderConfigDescrTag
230     videotoolbox_write_mp4_descr_length(&pb, config_size);
231     bytestream2_put_byteu(&pb, 32);       // object type indication. 32 = AV_CODEC_ID_MPEG4
232     bytestream2_put_byteu(&pb, 0x11);     // stream type
233     bytestream2_put_ne24(&pb, 0);         // buffer size
234     bytestream2_put_ne32(&pb, 0);         // max bitrate
235     bytestream2_put_ne32(&pb, 0);         // avg bitrate
236
237     // decoder specific descriptor
238     bytestream2_put_byteu(&pb, 0x05);     ///< DecSpecificInfoTag
239     videotoolbox_write_mp4_descr_length(&pb, avctx->extradata_size);
240
241     bytestream2_put_buffer(&pb, avctx->extradata, avctx->extradata_size);
242
243     // SLConfigDescriptor
244     bytestream2_put_byteu(&pb, 0x06);     // SLConfigDescrTag
245     bytestream2_put_byteu(&pb, 0x01);     // length
246     bytestream2_put_byteu(&pb, 0x02);     //
247
248     s = bytestream2_size_p(&pb);
249
250     data = CFDataCreate(kCFAllocatorDefault, rw_extradata, s);
251
252     av_freep(&rw_extradata);
253     return data;
254 }
255
256 static CMSampleBufferRef videotoolbox_sample_buffer_create(CMFormatDescriptionRef fmt_desc,
257                                                            void *buffer,
258                                                            int size)
259 {
260     OSStatus status;
261     CMBlockBufferRef  block_buf;
262     CMSampleBufferRef sample_buf;
263
264     block_buf  = NULL;
265     sample_buf = NULL;
266
267     status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault,// structureAllocator
268                                                 buffer,             // memoryBlock
269                                                 size,               // blockLength
270                                                 kCFAllocatorNull,   // blockAllocator
271                                                 NULL,               // customBlockSource
272                                                 0,                  // offsetToData
273                                                 size,               // dataLength
274                                                 0,                  // flags
275                                                 &block_buf);
276
277     if (!status) {
278         status = CMSampleBufferCreate(kCFAllocatorDefault,  // allocator
279                                       block_buf,            // dataBuffer
280                                       TRUE,                 // dataReady
281                                       0,                    // makeDataReadyCallback
282                                       0,                    // makeDataReadyRefcon
283                                       fmt_desc,             // formatDescription
284                                       1,                    // numSamples
285                                       0,                    // numSampleTimingEntries
286                                       NULL,                 // sampleTimingArray
287                                       0,                    // numSampleSizeEntries
288                                       NULL,                 // sampleSizeArray
289                                       &sample_buf);
290     }
291
292     if (block_buf)
293         CFRelease(block_buf);
294
295     return sample_buf;
296 }
297
298 static void videotoolbox_decoder_callback(void *opaque,
299                                           void *sourceFrameRefCon,
300                                           OSStatus status,
301                                           VTDecodeInfoFlags flags,
302                                           CVImageBufferRef image_buffer,
303                                           CMTime pts,
304                                           CMTime duration)
305 {
306     AVCodecContext *avctx = opaque;
307     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
308
309     if (vtctx->frame) {
310         CVPixelBufferRelease(vtctx->frame);
311         vtctx->frame = NULL;
312     }
313
314     if (!image_buffer) {
315         av_log(NULL, AV_LOG_DEBUG, "vt decoder cb: output image buffer is null\n");
316         return;
317     }
318
319     vtctx->frame = CVPixelBufferRetain(image_buffer);
320 }
321
322 static OSStatus videotoolbox_session_decode_frame(AVCodecContext *avctx)
323 {
324     OSStatus status;
325     CMSampleBufferRef sample_buf;
326     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
327     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
328
329     sample_buf = videotoolbox_sample_buffer_create(videotoolbox->cm_fmt_desc,
330                                                    vtctx->bitstream,
331                                                    vtctx->bitstream_size);
332
333     if (!sample_buf)
334         return -1;
335
336     status = VTDecompressionSessionDecodeFrame(videotoolbox->session,
337                                                sample_buf,
338                                                0,       // decodeFlags
339                                                NULL,    // sourceFrameRefCon
340                                                0);      // infoFlagsOut
341     if (status == noErr)
342         status = VTDecompressionSessionWaitForAsynchronousFrames(videotoolbox->session);
343
344     CFRelease(sample_buf);
345
346     return status;
347 }
348
349 static int videotoolbox_common_end_frame(AVCodecContext *avctx, AVFrame *frame)
350 {
351     int status;
352     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
353     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
354
355     if (!videotoolbox->session || !vtctx->bitstream)
356         return AVERROR_INVALIDDATA;
357
358     status = videotoolbox_session_decode_frame(avctx);
359
360     if (status) {
361         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
362         return AVERROR_UNKNOWN;
363     }
364
365     if (!vtctx->frame)
366         return AVERROR_UNKNOWN;
367
368     return ff_videotoolbox_buffer_create(vtctx, frame);
369 }
370
371 static int videotoolbox_h264_end_frame(AVCodecContext *avctx)
372 {
373     H264Context *h = avctx->priv_data;
374     AVFrame *frame = h->cur_pic_ptr->f;
375
376     return videotoolbox_common_end_frame(avctx, frame);
377 }
378
379 static int videotoolbox_mpeg_start_frame(AVCodecContext *avctx,
380                                          const uint8_t *buffer,
381                                          uint32_t size)
382 {
383     VTContext *vtctx = avctx->internal->hwaccel_priv_data;
384
385     return videotoolbox_buffer_copy(vtctx, buffer, size);
386 }
387
388 static int videotoolbox_mpeg_decode_slice(AVCodecContext *avctx,
389                                           const uint8_t *buffer,
390                                           uint32_t size)
391 {
392     return 0;
393 }
394
395 static int videotoolbox_mpeg_end_frame(AVCodecContext *avctx)
396 {
397     MpegEncContext *s = avctx->priv_data;
398     AVFrame *frame = s->current_picture_ptr->f;
399
400     return videotoolbox_common_end_frame(avctx, frame);
401 }
402
403 static CFDictionaryRef videotoolbox_decoder_config_create(CMVideoCodecType codec_type,
404                                                           AVCodecContext *avctx)
405 {
406     CFMutableDictionaryRef config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
407                                                                    0,
408                                                                    &kCFTypeDictionaryKeyCallBacks,
409                                                                    &kCFTypeDictionaryValueCallBacks);
410
411     CFDictionarySetValue(config_info,
412                          kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
413                          kCFBooleanTrue);
414
415     if (avctx->extradata_size) {
416         CFMutableDictionaryRef avc_info;
417         CFDataRef data = NULL;
418
419         avc_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
420                                              1,
421                                              &kCFTypeDictionaryKeyCallBacks,
422                                              &kCFTypeDictionaryValueCallBacks);
423
424         switch (codec_type) {
425         case kCMVideoCodecType_MPEG4Video :
426             data = videotoolbox_esds_extradata_create(avctx);
427             if (data)
428                 CFDictionarySetValue(avc_info, CFSTR("esds"), data);
429             break;
430         case kCMVideoCodecType_H264 :
431             data = ff_videotoolbox_avcc_extradata_create(avctx);
432             if (data)
433                 CFDictionarySetValue(avc_info, CFSTR("avcC"), data);
434             break;
435         default:
436             break;
437         }
438
439         CFDictionarySetValue(config_info,
440                 kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms,
441                 avc_info);
442
443         if (data)
444             CFRelease(data);
445
446         CFRelease(avc_info);
447     }
448     return config_info;
449 }
450
451 static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
452                                                              int height,
453                                                              OSType pix_fmt)
454 {
455     CFMutableDictionaryRef buffer_attributes;
456     CFMutableDictionaryRef io_surface_properties;
457     CFNumberRef cv_pix_fmt;
458     CFNumberRef w;
459     CFNumberRef h;
460
461     w = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width);
462     h = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height);
463     cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pix_fmt);
464
465     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
466                                                   4,
467                                                   &kCFTypeDictionaryKeyCallBacks,
468                                                   &kCFTypeDictionaryValueCallBacks);
469     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
470                                                       0,
471                                                       &kCFTypeDictionaryKeyCallBacks,
472                                                       &kCFTypeDictionaryValueCallBacks);
473
474     if (pix_fmt)
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 #if TARGET_OS_IPHONE
480     CFDictionarySetValue(buffer_attributes, kCVPixelBufferOpenGLESCompatibilityKey, kCFBooleanTrue);
481 #else
482     CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfaceOpenGLTextureCompatibilityKey, kCFBooleanTrue);
483 #endif
484
485     CFRelease(io_surface_properties);
486     CFRelease(cv_pix_fmt);
487     CFRelease(w);
488     CFRelease(h);
489
490     return buffer_attributes;
491 }
492
493 static CMVideoFormatDescriptionRef videotoolbox_format_desc_create(CMVideoCodecType codec_type,
494                                                                    CFDictionaryRef decoder_spec,
495                                                                    int width,
496                                                                    int height)
497 {
498     CMFormatDescriptionRef cm_fmt_desc;
499     OSStatus status;
500
501     status = CMVideoFormatDescriptionCreate(kCFAllocatorDefault,
502                                             codec_type,
503                                             width,
504                                             height,
505                                             decoder_spec, // Dictionary of extension
506                                             &cm_fmt_desc);
507
508     if (status)
509         return NULL;
510
511     return cm_fmt_desc;
512 }
513
514 static int videotoolbox_default_init(AVCodecContext *avctx)
515 {
516     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
517     OSStatus status;
518     VTDecompressionOutputCallbackRecord decoder_cb;
519     CFDictionaryRef decoder_spec;
520     CFDictionaryRef buf_attr;
521
522     if (!videotoolbox) {
523         av_log(avctx, AV_LOG_ERROR, "hwaccel context is not set\n");
524         return -1;
525     }
526
527     switch( avctx->codec_id ) {
528     case AV_CODEC_ID_H263 :
529         videotoolbox->cm_codec_type = kCMVideoCodecType_H263;
530         break;
531     case AV_CODEC_ID_H264 :
532         videotoolbox->cm_codec_type = kCMVideoCodecType_H264;
533         break;
534     case AV_CODEC_ID_MPEG1VIDEO :
535         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG1Video;
536         break;
537     case AV_CODEC_ID_MPEG2VIDEO :
538         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG2Video;
539         break;
540     case AV_CODEC_ID_MPEG4 :
541         videotoolbox->cm_codec_type = kCMVideoCodecType_MPEG4Video;
542         break;
543     default :
544         break;
545     }
546
547     decoder_spec = videotoolbox_decoder_config_create(videotoolbox->cm_codec_type, avctx);
548
549     videotoolbox->cm_fmt_desc = videotoolbox_format_desc_create(videotoolbox->cm_codec_type,
550                                                                 decoder_spec,
551                                                                 avctx->width,
552                                                                 avctx->height);
553     if (!videotoolbox->cm_fmt_desc) {
554         if (decoder_spec)
555             CFRelease(decoder_spec);
556
557         av_log(avctx, AV_LOG_ERROR, "format description creation failed\n");
558         return -1;
559     }
560
561     buf_attr = videotoolbox_buffer_attributes_create(avctx->width,
562                                                      avctx->height,
563                                                      videotoolbox->cv_pix_fmt_type);
564
565     decoder_cb.decompressionOutputCallback = videotoolbox_decoder_callback;
566     decoder_cb.decompressionOutputRefCon   = avctx;
567
568     status = VTDecompressionSessionCreate(NULL,                      // allocator
569                                           videotoolbox->cm_fmt_desc, // videoFormatDescription
570                                           decoder_spec,              // videoDecoderSpecification
571                                           buf_attr,                  // destinationImageBufferAttributes
572                                           &decoder_cb,               // outputCallback
573                                           &videotoolbox->session);   // decompressionSessionOut
574
575     if (decoder_spec)
576         CFRelease(decoder_spec);
577     if (buf_attr)
578         CFRelease(buf_attr);
579
580     switch (status) {
581     case kVTVideoDecoderNotAvailableNowErr:
582     case kVTVideoDecoderUnsupportedDataFormatErr:
583         return AVERROR(ENOSYS);
584     case kVTVideoDecoderMalfunctionErr:
585         return AVERROR(EINVAL);
586     case kVTVideoDecoderBadDataErr :
587         return AVERROR_INVALIDDATA;
588     case 0:
589         return 0;
590     default:
591         return AVERROR_UNKNOWN;
592     }
593 }
594
595 static void videotoolbox_default_free(AVCodecContext *avctx)
596 {
597     AVVideotoolboxContext *videotoolbox = avctx->hwaccel_context;
598
599     if (videotoolbox) {
600         if (videotoolbox->cm_fmt_desc)
601             CFRelease(videotoolbox->cm_fmt_desc);
602
603         if (videotoolbox->session) {
604             VTDecompressionSessionInvalidate(videotoolbox->session);
605             CFRelease(videotoolbox->session);
606         }
607     }
608 }
609
610 AVHWAccel ff_h263_videotoolbox_hwaccel = {
611     .name           = "h263_videotoolbox",
612     .type           = AVMEDIA_TYPE_VIDEO,
613     .id             = AV_CODEC_ID_H263,
614     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
615     .alloc_frame    = ff_videotoolbox_alloc_frame,
616     .start_frame    = videotoolbox_mpeg_start_frame,
617     .decode_slice   = videotoolbox_mpeg_decode_slice,
618     .end_frame      = videotoolbox_mpeg_end_frame,
619     .uninit         = ff_videotoolbox_uninit,
620     .priv_data_size = sizeof(VTContext),
621 };
622
623 AVHWAccel ff_h264_videotoolbox_hwaccel = {
624     .name           = "h264_videotoolbox",
625     .type           = AVMEDIA_TYPE_VIDEO,
626     .id             = AV_CODEC_ID_H264,
627     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
628     .alloc_frame    = ff_videotoolbox_alloc_frame,
629     .start_frame    = ff_videotoolbox_h264_start_frame,
630     .decode_slice   = ff_videotoolbox_h264_decode_slice,
631     .end_frame      = videotoolbox_h264_end_frame,
632     .uninit         = ff_videotoolbox_uninit,
633     .priv_data_size = sizeof(VTContext),
634 };
635
636 AVHWAccel ff_mpeg1_videotoolbox_hwaccel = {
637     .name           = "mpeg1_videotoolbox",
638     .type           = AVMEDIA_TYPE_VIDEO,
639     .id             = AV_CODEC_ID_MPEG1VIDEO,
640     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
641     .alloc_frame    = ff_videotoolbox_alloc_frame,
642     .start_frame    = videotoolbox_mpeg_start_frame,
643     .decode_slice   = videotoolbox_mpeg_decode_slice,
644     .end_frame      = videotoolbox_mpeg_end_frame,
645     .uninit         = ff_videotoolbox_uninit,
646     .priv_data_size = sizeof(VTContext),
647 };
648
649 AVHWAccel ff_mpeg2_videotoolbox_hwaccel = {
650     .name           = "mpeg2_videotoolbox",
651     .type           = AVMEDIA_TYPE_VIDEO,
652     .id             = AV_CODEC_ID_MPEG2VIDEO,
653     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
654     .alloc_frame    = ff_videotoolbox_alloc_frame,
655     .start_frame    = videotoolbox_mpeg_start_frame,
656     .decode_slice   = videotoolbox_mpeg_decode_slice,
657     .end_frame      = videotoolbox_mpeg_end_frame,
658     .uninit         = ff_videotoolbox_uninit,
659     .priv_data_size = sizeof(VTContext),
660 };
661
662 AVHWAccel ff_mpeg4_videotoolbox_hwaccel = {
663     .name           = "mpeg4_videotoolbox",
664     .type           = AVMEDIA_TYPE_VIDEO,
665     .id             = AV_CODEC_ID_MPEG4,
666     .pix_fmt        = AV_PIX_FMT_VIDEOTOOLBOX,
667     .alloc_frame    = ff_videotoolbox_alloc_frame,
668     .start_frame    = videotoolbox_mpeg_start_frame,
669     .decode_slice   = videotoolbox_mpeg_decode_slice,
670     .end_frame      = videotoolbox_mpeg_end_frame,
671     .uninit         = ff_videotoolbox_uninit,
672     .priv_data_size = sizeof(VTContext),
673 };
674
675 AVVideotoolboxContext *av_videotoolbox_alloc_context(void)
676 {
677     AVVideotoolboxContext *ret = av_mallocz(sizeof(*ret));
678
679     if (ret) {
680         ret->output_callback = videotoolbox_decoder_callback;
681         ret->cv_pix_fmt_type = kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange;
682     }
683
684     return ret;
685 }
686
687 int av_videotoolbox_default_init(AVCodecContext *avctx)
688 {
689     return av_videotoolbox_default_init2(avctx, NULL);
690 }
691
692 int av_videotoolbox_default_init2(AVCodecContext *avctx, AVVideotoolboxContext *vtctx)
693 {
694     avctx->hwaccel_context = vtctx ?: av_videotoolbox_alloc_context();
695     if (!avctx->hwaccel_context)
696         return AVERROR(ENOMEM);
697     return videotoolbox_default_init(avctx);
698 }
699
700 void av_videotoolbox_default_free(AVCodecContext *avctx)
701 {
702
703     videotoolbox_default_free(avctx);
704     av_freep(&avctx->hwaccel_context);
705 }
706 #endif /* CONFIG_VIDEOTOOLBOX */