Change license headers to say 'FFmpeg' instead of 'this program/this library'
[ffmpeg.git] / libavformat / mxf.c
1 /*
2  * MXF demuxer.
3  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /*
23  * References
24  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
25  * SMPTE 377M MXF File Format Specifications
26  * SMPTE 378M Operational Pattern 1a
27  * SMPTE 379M MXF Generic Container
28  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
29  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
30  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
31  *
32  * Principle
33  * Search for Track numbers which will identify essence element KLV packets.
34  * Search for SourcePackage which define tracks which contains Track numbers.
35  * Material Package contains tracks with reference to SourcePackage tracks.
36  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
37  * Assign Descriptors to correct Tracks.
38  *
39  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
40  * Metadata parsing resolves Strong References to objects.
41  *
42  * Simple demuxer, only OP1A supported and some files might not work at all.
43  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
44  */
45
46 //#define DEBUG
47
48 #include "avformat.h"
49
50 typedef uint8_t UID[16];
51
52 enum MXFMetadataSetType {
53     MaterialPackage,
54     SourcePackage,
55     SourceClip,
56     TimecodeComponent,
57     Sequence,
58     MultipleDescriptor,
59     Descriptor,
60     Track,
61     EssenceContainerData,
62 };
63
64 typedef struct MXFStructuralComponent {
65     UID uid;
66     enum MXFMetadataSetType type;
67     UID source_package_uid;
68     UID data_definition_ul;
69     int64_t duration;
70     int64_t start_position;
71     int source_track_id;
72 } MXFStructuralComponent;
73
74 typedef struct MXFSequence {
75     UID uid;
76     enum MXFMetadataSetType type;
77     UID data_definition_ul;
78     UID *structural_components_refs;
79     int structural_components_count;
80     int64_t duration;
81 } MXFSequence;
82
83 typedef struct MXFTrack {
84     UID uid;
85     enum MXFMetadataSetType type;
86     MXFSequence *sequence; /* mandatory, and only one */
87     UID sequence_ref;
88     int track_id;
89     uint8_t track_number[4];
90     AVRational edit_rate;
91 } MXFTrack;
92
93 typedef struct MXFDescriptor {
94     UID uid;
95     enum MXFMetadataSetType type;
96     UID essence_container_ul;
97     UID essence_codec_ul;
98     AVRational sample_rate;
99     AVRational aspect_ratio;
100     int width;
101     int height;
102     int channels;
103     int bits_per_sample;
104     UID *sub_descriptors_refs;
105     int sub_descriptors_count;
106     int linked_track_id;
107     uint8_t *extradata;
108     int extradata_size;
109 } MXFDescriptor;
110
111 typedef struct MXFPackage {
112     UID uid;
113     enum MXFMetadataSetType type;
114     UID package_uid;
115     UID *tracks_refs;
116     int tracks_count;
117     MXFDescriptor *descriptor; /* only one */
118     UID descriptor_ref;
119 } MXFPackage;
120
121 typedef struct MXFEssenceContainerData {
122     UID uid;
123     enum MXFMetadataSetType type;
124     UID linked_package_uid;
125 } MXFEssenceContainerData;
126
127 typedef struct {
128     UID uid;
129     enum MXFMetadataSetType type;
130 } MXFMetadataSet;
131
132 typedef struct MXFContext {
133     UID *packages_refs;
134     int packages_count;
135     UID *essence_container_data_sets_refs;
136     int essence_container_data_sets_count;
137     UID *essence_containers_uls; /* Universal Labels SMPTE RP224 */
138     int essence_containers_uls_count;
139     UID operational_pattern_ul;
140     UID content_storage_uid;
141     MXFMetadataSet **metadata_sets;
142     int metadata_sets_count;
143     AVFormatContext *fc;
144 } MXFContext;
145
146 typedef struct KLVPacket {
147     UID key;
148     offset_t offset;
149     uint64_t length;
150 } KLVPacket;
151
152 enum MXFWrappingScheme {
153     Frame,
154     Clip,
155 };
156
157 typedef struct MXFCodecUL {
158     UID uid;
159     enum CodecID id;
160     enum MXFWrappingScheme wrapping;
161 } MXFCodecUL;
162
163 typedef struct MXFDataDefinitionUL {
164     UID uid;
165     enum CodecType type;
166 } MXFDataDefinitionUL;
167
168 typedef struct MXFMetadataReadTableEntry {
169     const UID key;
170     int (*read)(MXFContext *mxf, KLVPacket *klv);
171 } MXFMetadataReadTableEntry;
172
173 /* partial keys to match */
174 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
175 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
176
177 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
178
179 #define PRINT_KEY(s, x) dprintf("%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
180                              (x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15])
181
182 static int64_t klv_decode_ber_length(ByteIOContext *pb)
183 {
184     int64_t size = 0;
185     uint8_t length = get_byte(pb);
186     int type = length >> 7;
187
188     if (type) { /* long form */
189         int bytes_num = length & 0x7f;
190         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
191         if (bytes_num > 8)
192             return -1;
193         while (bytes_num--)
194             size = size << 8 | get_byte(pb);
195     } else {
196         size = length & 0x7f;
197     }
198     return size;
199 }
200
201 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
202 {
203     klv->offset = url_ftell(pb);
204     get_buffer(pb, klv->key, 16);
205     klv->length = klv_decode_ber_length(pb);
206     return klv->length == -1 ? -1 : 0;
207 }
208
209 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
210 {
211     int i;
212
213     for (i = 0; i < s->nb_streams; i++) {
214         MXFTrack *track = s->streams[i]->priv_data;
215          /* SMPTE 379M 7.3 */
216         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
217             return i;
218     }
219     /* return 0 if only one stream, for OP Atom files with 0 as track number */
220     return s->nb_streams == 1 ? 0 : -1;
221 }
222
223 /* XXX: use AVBitStreamFilter */
224 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
225 {
226     uint8_t buffer[61444];
227     uint8_t *buf_ptr, *end_ptr, *data_ptr;
228
229     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
230         return -1;
231     get_buffer(pb, buffer, length);
232     av_new_packet(pkt, length);
233     data_ptr = pkt->data;
234     end_ptr = buffer + length;
235     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
236     for (; buf_ptr < end_ptr; buf_ptr += 4) {
237         if (st->codec->bits_per_sample == 24) {
238             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
239             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
240             data_ptr[2] = (buf_ptr[0] >> 4) | ((buf_ptr[1] & 0x0f) << 4);
241             data_ptr += 3;
242         } else {
243             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
244             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
245             data_ptr += 2;
246         }
247     }
248     pkt->size = data_ptr - pkt->data;
249     return 0;
250 }
251
252 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
253 {
254     KLVPacket klv;
255
256     while (!url_feof(&s->pb)) {
257         if (klv_read_packet(&klv, &s->pb) < 0) {
258             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
259             return -1;
260         }
261 #ifdef DEBUG
262         PRINT_KEY("read packet", klv.key);
263 #endif
264         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
265             int index = mxf_get_stream_index(s, &klv);
266             if (index < 0) {
267                 av_log(s, AV_LOG_ERROR, "error getting stream index\n");
268                 return -1;
269             }
270             /* check for 8 channels AES3 element */
271             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
272                 if (mxf_get_d10_aes3_packet(&s->pb, s->streams[index], pkt, klv.length) < 0) {
273                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
274                     return -1;
275                 }
276             } else
277                 av_get_packet(&s->pb, pkt, klv.length);
278             pkt->stream_index = index;
279             return 0;
280         } else
281             url_fskip(&s->pb, klv.length);
282     }
283     return AVERROR_IO;
284 }
285
286 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
287 {
288     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
289     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
290     mxf->metadata_sets_count++;
291     return 0;
292 }
293
294 static int mxf_read_metadata_preface(MXFContext *mxf, KLVPacket *klv)
295 {
296     ByteIOContext *pb = &mxf->fc->pb;
297     int bytes_read = 0;
298
299     while (bytes_read < klv->length) {
300         int tag = get_be16(pb);
301         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
302
303         switch (tag) {
304         case 0x3B03:
305             get_buffer(pb, mxf->content_storage_uid, 16);
306             break;
307         case 0x3B09:
308             get_buffer(pb, mxf->operational_pattern_ul, 16);
309             break;
310         case 0x3B0A:
311             mxf->essence_containers_uls_count = get_be32(pb);
312             if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))
313                 return -1;
314             mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));
315             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
316             get_buffer(pb, (uint8_t *)mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));
317             break;
318         default:
319             url_fskip(pb, size);
320         }
321         bytes_read += size + 4;
322     }
323     return 0;
324 }
325
326 static int mxf_read_metadata_content_storage(MXFContext *mxf, KLVPacket *klv)
327 {
328     ByteIOContext *pb = &mxf->fc->pb;
329     int bytes_read = 0;
330
331     while (bytes_read < klv->length) {
332         int tag = get_be16(pb);
333         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
334
335         dprintf("tag 0x%04X, size %d\n", tag, size);
336         switch (tag) {
337         case 0x1901:
338             mxf->packages_count = get_be32(pb);
339             if (mxf->packages_count >= UINT_MAX / sizeof(UID))
340                 return -1;
341             mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
342             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
343             get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
344             break;
345         case 0x1902:
346             mxf->essence_container_data_sets_count = get_be32(pb);
347             if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))
348                 return -1;
349             mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));
350             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
351             get_buffer(pb, (uint8_t *)mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));
352             break;
353         default:
354             url_fskip(pb, size);
355         }
356         bytes_read += size + 4;
357     }
358     return 0;
359 }
360
361 static int mxf_read_metadata_source_clip(MXFContext *mxf, KLVPacket *klv)
362 {
363     ByteIOContext *pb = &mxf->fc->pb;
364     MXFStructuralComponent *source_clip = av_mallocz(sizeof(*source_clip));
365     int bytes_read = 0;
366
367     while (bytes_read < klv->length) {
368         int tag = get_be16(pb);
369         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
370
371         bytes_read += size + 4;
372         dprintf("tag 0x%04X, size %d\n", tag, size);
373         if (!size) /* ignore empty tag, needed for some files with empty UMID tag */
374             continue;
375         switch (tag) {
376         case 0x3C0A:
377             get_buffer(pb, source_clip->uid, 16);
378             break;
379         case 0x0202:
380             source_clip->duration = get_be64(pb);
381             break;
382         case 0x1201:
383             source_clip->start_position = get_be64(pb);
384             break;
385         case 0x1101:
386             /* UMID, only get last 16 bytes */
387             url_fskip(pb, 16);
388             get_buffer(pb, source_clip->source_package_uid, 16);
389             break;
390         case 0x1102:
391             source_clip->source_track_id = get_be32(pb);
392             break;
393         default:
394             url_fskip(pb, size);
395         }
396     }
397     source_clip->type = SourceClip;
398     return mxf_add_metadata_set(mxf, source_clip);
399 }
400
401 static int mxf_read_metadata_material_package(MXFContext *mxf, KLVPacket *klv)
402 {
403     ByteIOContext *pb = &mxf->fc->pb;
404     MXFPackage *package = av_mallocz(sizeof(*package));
405     int bytes_read = 0;
406
407     while (bytes_read < klv->length) {
408         int tag = get_be16(pb);
409         int size = get_be16(pb); /* KLV specified by 0x53 */
410
411         switch (tag) {
412         case 0x3C0A:
413             get_buffer(pb, package->uid, 16);
414             break;
415         case 0x4403:
416             package->tracks_count = get_be32(pb);
417             if (package->tracks_count >= UINT_MAX / sizeof(UID))
418                 return -1;
419             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
420             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
421             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
422             break;
423         default:
424             url_fskip(pb, size);
425         }
426         bytes_read += size + 4;
427     }
428     package->type = MaterialPackage;
429     return mxf_add_metadata_set(mxf, package);
430 }
431
432 static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)
433 {
434     ByteIOContext *pb = &mxf->fc->pb;
435     MXFTrack *track = av_mallocz(sizeof(*track));
436     int bytes_read = 0;
437
438     while (bytes_read < klv->length) {
439         int tag = get_be16(pb);
440         int size = get_be16(pb); /* KLV specified by 0x53 */
441
442         dprintf("tag 0x%04X, size %d\n", tag, size);
443         switch (tag) {
444         case 0x3C0A:
445             get_buffer(pb, track->uid, 16);
446             break;
447         case 0x4801:
448             track->track_id = get_be32(pb);
449             break;
450         case 0x4804:
451             get_buffer(pb, track->track_number, 4);
452             break;
453         case 0x4B01:
454             track->edit_rate.den = get_be32(pb);
455             track->edit_rate.num = get_be32(pb);
456             break;
457         case 0x4803:
458             get_buffer(pb, track->sequence_ref, 16);
459             break;
460         default:
461             url_fskip(pb, size);
462         }
463         bytes_read += size + 4;
464     }
465     track->type = Track;
466     return mxf_add_metadata_set(mxf, track);
467 }
468
469 static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)
470 {
471     ByteIOContext *pb = &mxf->fc->pb;
472     MXFSequence *sequence = av_mallocz(sizeof(*sequence));
473     int bytes_read = 0;
474
475     while (bytes_read < klv->length) {
476         int tag = get_be16(pb);
477         int size = get_be16(pb); /* KLV specified by 0x53 */
478
479         dprintf("tag 0x%04X, size %d\n", tag, size);
480         switch (tag) {
481         case 0x3C0A:
482             get_buffer(pb, sequence->uid, 16);
483             break;
484         case 0x0202:
485             sequence->duration = get_be64(pb);
486             break;
487         case 0x0201:
488             get_buffer(pb, sequence->data_definition_ul, 16);
489             break;
490         case 0x1001:
491             sequence->structural_components_count = get_be32(pb);
492             if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
493                 return -1;
494             sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
495             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
496             get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
497             break;
498         default:
499             url_fskip(pb, size);
500         }
501         bytes_read += size + 4;
502     }
503     sequence->type = Sequence;
504     return mxf_add_metadata_set(mxf, sequence);
505 }
506
507 static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)
508 {
509     ByteIOContext *pb = &mxf->fc->pb;
510     MXFPackage *package = av_mallocz(sizeof(*package));
511     int bytes_read = 0;
512
513     while (bytes_read < klv->length) {
514         int tag = get_be16(pb);
515         int size = get_be16(pb); /* KLV specified by 0x53 */
516
517         dprintf("tag 0x%04X, size %d\n", tag, size);
518         switch (tag) {
519         case 0x3C0A:
520             get_buffer(pb, package->uid, 16);
521             break;
522         case 0x4403:
523             package->tracks_count = get_be32(pb);
524             if (package->tracks_count >= UINT_MAX / sizeof(UID))
525                 return -1;
526             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
527             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
528             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
529             break;
530         case 0x4401:
531             /* UMID, only get last 16 bytes */
532             url_fskip(pb, 16);
533             get_buffer(pb, package->package_uid, 16);
534             break;
535         case 0x4701:
536             get_buffer(pb, package->descriptor_ref, 16);
537             break;
538         default:
539             url_fskip(pb, size);
540         }
541         bytes_read += size + 4;
542     }
543     package->type = SourcePackage;
544     return mxf_add_metadata_set(mxf, package);
545 }
546
547 static int mxf_read_metadata_multiple_descriptor(MXFContext *mxf, KLVPacket *klv)
548 {
549     ByteIOContext *pb = &mxf->fc->pb;
550     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));
551     int bytes_read = 0;
552
553     while (bytes_read < klv->length) {
554         int tag = get_be16(pb);
555         int size = get_be16(pb); /* KLV specified by 0x53 */
556
557         dprintf("tag 0x%04X, size %d\n", tag, size);
558         switch (tag) {
559         case 0x3C0A:
560             get_buffer(pb, descriptor->uid, 16);
561             break;
562         case 0x3F01:
563             descriptor->sub_descriptors_count = get_be32(pb);
564             if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
565                 return -1;
566             descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
567             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
568             get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
569             break;
570         default:
571             url_fskip(pb, size);
572         }
573         bytes_read += size + 4;
574     }
575     descriptor->type = MultipleDescriptor;
576     return mxf_add_metadata_set(mxf, descriptor);
577 }
578
579 static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
580 {
581     int code;
582
583     do {
584         code = get_byte(pb);
585         dprintf("pixel layout: code 0x%x\n", code);
586         switch (code) {
587         case 0x52: /* R */
588             descriptor->bits_per_sample += get_byte(pb);
589             break;
590         case 0x47: /* G */
591             descriptor->bits_per_sample += get_byte(pb);
592             break;
593         case 0x42: /* B */
594             descriptor->bits_per_sample += get_byte(pb);
595             break;
596         default:
597             get_byte(pb);
598         }
599     } while (code != 0); /* SMPTE 377M E.2.46 */
600 }
601
602 static int mxf_read_metadata_generic_descriptor(MXFContext *mxf, KLVPacket *klv)
603 {
604     ByteIOContext *pb = &mxf->fc->pb;
605     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));
606     int bytes_read = 0;
607
608     while (bytes_read < klv->length) {
609         int tag = get_be16(pb);
610         int size = get_be16(pb); /* KLV specified by 0x53 */
611
612         dprintf("tag 0x%04X, size %d\n", tag, size);
613         switch (tag) {
614         case 0x3C0A:
615             get_buffer(pb, descriptor->uid, 16);
616             break;
617         case 0x3004:
618             get_buffer(pb, descriptor->essence_container_ul, 16);
619             break;
620         case 0x3006:
621             descriptor->linked_track_id = get_be32(pb);
622             break;
623         case 0x3201: /* PictureEssenceCoding */
624             get_buffer(pb, descriptor->essence_codec_ul, 16);
625             break;
626         case 0x3203:
627             descriptor->width = get_be32(pb);
628             break;
629         case 0x3202:
630             descriptor->height = get_be32(pb);
631             break;
632         case 0x320E:
633             descriptor->aspect_ratio.num = get_be32(pb);
634             descriptor->aspect_ratio.den = get_be32(pb);
635             break;
636         case 0x3D03:
637             descriptor->sample_rate.num = get_be32(pb);
638             descriptor->sample_rate.den = get_be32(pb);
639             break;
640         case 0x3D06: /* SoundEssenceCompression */
641             get_buffer(pb, descriptor->essence_codec_ul, 16);
642             break;
643         case 0x3D07:
644             descriptor->channels = get_be32(pb);
645             break;
646         case 0x3D01:
647             descriptor->bits_per_sample = get_be32(pb);
648             break;
649         case 0x3401:
650             mxf_read_metadata_pixel_layout(pb, descriptor);
651             break;
652         case 0x8201: /* Private tag used by SONY C0023S01.mxf */
653             descriptor->extradata = av_malloc(size);
654             descriptor->extradata_size = size;
655             get_buffer(pb, descriptor->extradata, size);
656             break;
657         default:
658             url_fskip(pb, size);
659         }
660         bytes_read += size + 4;
661     }
662     descriptor->type = Descriptor;
663     return mxf_add_metadata_set(mxf, descriptor);
664 }
665
666 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
667 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
668     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
669     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
670     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
671     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
672 };
673
674 static const MXFCodecUL mxf_codec_uls[] = {
675     /* PictureEssenceCoding */
676     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
677     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
678     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
679     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
680     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
681     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
682     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
683     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
684     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
685     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
686     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
687     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
688     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
689     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
690     /* SoundEssenceCompression */
691     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
692     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
693     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 },  CODEC_ID_PCM_S16BE, Frame }, /* From Omneon MXF file */
694     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
695     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame }, /* XDCAM Proxy C0023S01.mxf */
696     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
697     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
698   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
699     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
700 };
701
702 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
703     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
704     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xe0,0x02 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Clip wrapped, 0xe0 MPV stream id */
705     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x04,0x61,0x07 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Custom wrapped, 0x61 ??? stream id */
706     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
707 };
708
709 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
710     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
711     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
712     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
713     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0xc0 MPA stream id */
714     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x02 },        CODEC_ID_MP2,  Clip }, /* MPEG-ES Clip wrapped, 0xc0 MPA stream id */
715     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */
716     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 50Mbps PAL Extended Template */
717     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
718 };
719
720 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
721 {
722     while (uls->id != CODEC_ID_NONE) {
723         if(!memcmp(uls->uid, *uid, 16))
724             break;
725         uls++;
726     }
727     return uls;
728 }
729
730 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
731 {
732     while (uls->type != CODEC_TYPE_DATA) {
733         if(!memcmp(uls->uid, *uid, 16))
734             break;
735         uls++;
736     }
737     return uls->type;
738 }
739
740 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref)
741 {
742     int i;
743
744     if (!strong_ref)
745         return NULL;
746     for (i = 0; i < mxf->metadata_sets_count; i++) {
747         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16)) {
748             return mxf->metadata_sets[i];
749         }
750     }
751     return NULL;
752 }
753
754 static int mxf_parse_structural_metadata(MXFContext *mxf)
755 {
756     MXFPackage *material_package = NULL;
757     MXFPackage *source_package = NULL;
758     MXFPackage *temp_package = NULL;
759     int i, j, k;
760
761     dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
762     /* TODO: handle multiple material packages (OP3x) */
763     for (i = 0; i < mxf->packages_count; i++) {
764         if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i]))) {
765             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve package strong ref\n");
766             return -1;
767         }
768         if (temp_package->type == MaterialPackage) {
769             material_package = temp_package;
770             break;
771         }
772     }
773     if (!material_package) {
774         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
775         return -1;
776     }
777
778     for (i = 0; i < material_package->tracks_count; i++) {
779         MXFTrack *material_track = NULL;
780         MXFTrack *source_track = NULL;
781         MXFTrack *temp_track = NULL;
782         MXFDescriptor *descriptor = NULL;
783         MXFStructuralComponent *component = NULL;
784         const MXFCodecUL *codec_ul = NULL;
785         const MXFCodecUL *container_ul = NULL;
786         AVStream *st;
787
788         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i]))) {
789             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
790             continue;
791         }
792
793         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref))) {
794             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
795             return -1;
796         }
797
798         /* TODO: handle multiple source clips */
799         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
800             /* TODO: handle timecode component */
801             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j]);
802             if (!component || component->type != SourceClip)
803                 continue;
804
805             for (k = 0; k < mxf->packages_count; k++) {
806                 if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k]))) {
807                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
808                     return -1;
809                 }
810                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
811                     source_package = temp_package;
812                     break;
813                 }
814             }
815             if (!source_package) {
816                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
817                 break;
818             }
819             for (k = 0; k < source_package->tracks_count; k++) {
820                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k]))) {
821                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
822                     return -1;
823                 }
824                 if (temp_track->track_id == component->source_track_id) {
825                     source_track = temp_track;
826                     break;
827                 }
828             }
829             if (!source_track) {
830                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
831                 break;
832             }
833         }
834         if (!source_track)
835             continue;
836
837         st = av_new_stream(mxf->fc, source_track->track_id);
838         st->priv_data = source_track;
839         st->duration = component->duration;
840         if (st->duration == -1)
841             st->duration = AV_NOPTS_VALUE;
842         st->start_time = component->start_position;
843         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
844
845         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref))) {
846             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
847             return -1;
848         }
849
850 #ifdef DEBUG
851         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
852 #endif
853         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
854
855         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref);
856         if (source_package->descriptor) {
857             if (source_package->descriptor->type == MultipleDescriptor) {
858                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
859                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j]);
860
861                     if (!sub_descriptor) {
862                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
863                         continue;
864                     }
865                     if (sub_descriptor->linked_track_id == source_track->track_id) {
866                         descriptor = sub_descriptor;
867                         break;
868                     }
869                 }
870             } else
871                 descriptor = source_package->descriptor;
872         }
873         if (!descriptor) {
874             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
875             continue;
876         }
877 #ifdef DEBUG
878         PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
879         PRINT_KEY("essence container ul", descriptor->essence_container_ul);
880 #endif
881         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
882         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
883         st->codec->codec_id = codec_ul->id;
884         if (descriptor->extradata) {
885             st->codec->extradata = descriptor->extradata;
886             st->codec->extradata_size = descriptor->extradata_size;
887         }
888         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
889             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
890             if (st->codec->codec_id == CODEC_ID_NONE)
891                 st->codec->codec_id = container_ul->id;
892             st->codec->width = descriptor->width;
893             st->codec->height = descriptor->height;
894             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
895         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
896             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
897             if (st->codec->codec_id == CODEC_ID_NONE)
898                 st->codec->codec_id = container_ul->id;
899             st->codec->channels = descriptor->channels;
900             st->codec->bits_per_sample = descriptor->bits_per_sample;
901             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
902             /* TODO: implement CODEC_ID_RAWAUDIO */
903             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
904                 if (descriptor->bits_per_sample == 24)
905                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
906                 else if (descriptor->bits_per_sample == 32)
907                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
908             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
909                 if (descriptor->bits_per_sample == 24)
910                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
911                 else if (descriptor->bits_per_sample == 32)
912                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
913                 if (descriptor->essence_container_ul[14] == 0x01) /* D-10 Mapping */
914                     st->codec->channels = 8; /* force channels to 8 */
915             } else if (st->codec->codec_id == CODEC_ID_MP2) {
916                 st->need_parsing = 1;
917             }
918         }
919         if (container_ul && container_ul->wrapping == Clip) {
920             dprintf("stream %d: clip wrapped essence\n", st->index);
921             st->need_parsing = 1;
922         }
923     }
924     return 0;
925 }
926
927 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
928     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },
929     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },
930     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },
931     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },
932     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },
933     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },
934     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },
935     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */
936     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */
937     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */
938     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */
939     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */
940     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */
941     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */
942     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */
943     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },
944 };
945
946 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
947 {
948     MXFContext *mxf = s->priv_data;
949     KLVPacket klv;
950
951     mxf->fc = s;
952     while (!url_feof(&s->pb)) {
953         const MXFMetadataReadTableEntry *function;
954
955         if (klv_read_packet(&klv, &s->pb) < 0) {
956             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
957             return -1;
958         }
959 #ifdef DEBUG
960         PRINT_KEY("read header", klv.key);
961 #endif
962         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
963             /* FIXME avoid seek */
964             url_fseek(&s->pb, klv.offset, SEEK_SET);
965             break;
966         }
967
968         for (function = mxf_metadata_read_table; function->read; function++) {
969             if (IS_KLV_KEY(klv.key, function->key)) {
970                 if (function->read(mxf, &klv) < 0) {
971                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
972                     return -1;
973                 }
974                 break;
975             }
976         }
977         if (!function->read)
978             url_fskip(&s->pb, klv.length);
979     }
980     return mxf_parse_structural_metadata(mxf);
981 }
982
983 static int mxf_read_close(AVFormatContext *s)
984 {
985     MXFContext *mxf = s->priv_data;
986     int i;
987
988     av_freep(&mxf->packages_refs);
989     av_freep(&mxf->essence_container_data_sets_refs);
990     av_freep(&mxf->essence_containers_uls);
991     for (i = 0; i < mxf->metadata_sets_count; i++) {
992         switch (mxf->metadata_sets[i]->type) {
993         case MultipleDescriptor:
994             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
995             break;
996         case Sequence:
997             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
998             break;
999         case SourcePackage:
1000         case MaterialPackage:
1001             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
1002             break;
1003         default:
1004             break;
1005         }
1006         av_freep(&mxf->metadata_sets[i]);
1007     }
1008     av_freep(&mxf->metadata_sets);
1009     return 0;
1010 }
1011
1012 static int mxf_probe(AVProbeData *p) {
1013     uint8_t *bufp = p->buf;
1014     uint8_t *end = p->buf + p->buf_size;
1015
1016     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
1017         return 0;
1018
1019     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
1020     end -= sizeof(mxf_header_partition_pack_key);
1021     for (; bufp < end; bufp++) {
1022         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
1023             return AVPROBE_SCORE_MAX;
1024     }
1025     return 0;
1026 }
1027
1028 /* rudimentary binary seek */
1029 /* XXX: use MXF Index */
1030 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
1031 {
1032     AVStream *st = s->streams[stream_index];
1033     offset_t pos = url_ftell(&s->pb);
1034     int64_t seconds;
1035     int i;
1036
1037     if (!s->bit_rate || sample_time < 0)
1038         return -1;
1039     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
1040     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
1041     /* sync on KLV essence element */
1042     for (i = 0; i < 12 && url_ftell(&s->pb) < s->file_size; i++) {
1043         int b = get_byte(&s->pb);
1044         if (b == mxf_essence_element_key[0])
1045             i = 0;
1046         else if (b != mxf_essence_element_key[i])
1047             i = -1;
1048     }
1049     if (i == 12) { /* found KLV key */
1050         url_fseek(&s->pb, -12, SEEK_CUR);
1051         av_update_cur_dts(s, st, sample_time);
1052         return 0;
1053     }
1054     url_fseek(&s->pb, pos, SEEK_SET);
1055     return -1;
1056 }
1057
1058 AVInputFormat mxf_demuxer = {
1059     "mxf",
1060     "MXF format",
1061     sizeof(MXFContext),
1062     mxf_probe,
1063     mxf_read_header,
1064     mxf_read_packet,
1065     mxf_read_close,
1066     mxf_read_seek,
1067 };