remove useless preface parsing for now, will reintroduce it if needed
[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     AnyType,
54     MaterialPackage,
55     SourcePackage,
56     SourceClip,
57     TimecodeComponent,
58     Sequence,
59     MultipleDescriptor,
60     Descriptor,
61     Track,
62     EssenceContainerData,
63 };
64
65 typedef struct MXFStructuralComponent {
66     UID uid;
67     enum MXFMetadataSetType type;
68     UID source_package_uid;
69     UID data_definition_ul;
70     int64_t duration;
71     int64_t start_position;
72     int source_track_id;
73 } MXFStructuralComponent;
74
75 typedef struct MXFSequence {
76     UID uid;
77     enum MXFMetadataSetType type;
78     UID data_definition_ul;
79     UID *structural_components_refs;
80     int structural_components_count;
81     int64_t duration;
82 } MXFSequence;
83
84 typedef struct MXFTrack {
85     UID uid;
86     enum MXFMetadataSetType type;
87     MXFSequence *sequence; /* mandatory, and only one */
88     UID sequence_ref;
89     int track_id;
90     uint8_t track_number[4];
91     AVRational edit_rate;
92 } MXFTrack;
93
94 typedef struct MXFDescriptor {
95     UID uid;
96     enum MXFMetadataSetType type;
97     UID essence_container_ul;
98     UID essence_codec_ul;
99     AVRational sample_rate;
100     AVRational aspect_ratio;
101     int width;
102     int height;
103     int channels;
104     int bits_per_sample;
105     UID *sub_descriptors_refs;
106     int sub_descriptors_count;
107     int linked_track_id;
108     uint8_t *extradata;
109     int extradata_size;
110 } MXFDescriptor;
111
112 typedef struct MXFPackage {
113     UID uid;
114     enum MXFMetadataSetType type;
115     UID package_uid;
116     UID *tracks_refs;
117     int tracks_count;
118     MXFDescriptor *descriptor; /* only one */
119     UID descriptor_ref;
120 } MXFPackage;
121
122 typedef struct MXFEssenceContainerData {
123     UID uid;
124     enum MXFMetadataSetType type;
125     UID linked_package_uid;
126 } MXFEssenceContainerData;
127
128 typedef struct {
129     UID uid;
130     enum MXFMetadataSetType type;
131 } MXFMetadataSet;
132
133 typedef struct MXFContext {
134     UID *packages_refs;
135     int packages_count;
136     UID *essence_container_data_sets_refs;
137     int essence_container_data_sets_count;
138     MXFMetadataSet **metadata_sets;
139     int metadata_sets_count;
140     const uint8_t *sync_key;
141     AVFormatContext *fc;
142 } MXFContext;
143
144 typedef struct KLVPacket {
145     UID key;
146     offset_t offset;
147     uint64_t length;
148 } KLVPacket;
149
150 enum MXFWrappingScheme {
151     Frame,
152     Clip,
153 };
154
155 typedef struct MXFCodecUL {
156     UID uid;
157     enum CodecID id;
158     enum MXFWrappingScheme wrapping;
159 } MXFCodecUL;
160
161 typedef struct MXFDataDefinitionUL {
162     UID uid;
163     enum CodecType type;
164 } MXFDataDefinitionUL;
165
166 typedef struct MXFMetadataReadTableEntry {
167     const UID key;
168     int (*read)();
169     int ctx_size;
170     enum MXFMetadataSetType type;
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 /* complete keys to match */
177 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
178
179 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
180
181 #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, \
182                              (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])
183
184 static int64_t klv_decode_ber_length(ByteIOContext *pb)
185 {
186     uint64_t size = get_byte(pb);
187     if (size & 0x80) { /* long form */
188         int bytes_num = size & 0x7f;
189         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
190         if (bytes_num > 8)
191             return -1;
192         size = 0;
193         while (bytes_num--)
194             size = size << 8 | get_byte(pb);
195     }
196     return size;
197 }
198
199 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
200 {
201     klv->offset = url_ftell(pb);
202     get_buffer(pb, klv->key, 16);
203     klv->length = klv_decode_ber_length(pb);
204     return klv->length == -1 ? -1 : 0;
205 }
206
207 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
208 {
209     int i;
210
211     for (i = 0; i < s->nb_streams; i++) {
212         MXFTrack *track = s->streams[i]->priv_data;
213         /* SMPTE 379M 7.3 */
214         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
215             return i;
216     }
217     /* return 0 if only one stream, for OP Atom files with 0 as track number */
218     return s->nb_streams == 1 ? 0 : -1;
219 }
220
221 /* XXX: use AVBitStreamFilter */
222 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
223 {
224     uint8_t buffer[61444];
225     uint8_t *buf_ptr, *end_ptr, *data_ptr;
226
227     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
228         return -1;
229     get_buffer(pb, buffer, length);
230     av_new_packet(pkt, length);
231     data_ptr = pkt->data;
232     end_ptr = buffer + length;
233     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
234     for (; buf_ptr < end_ptr; buf_ptr += 4) {
235         if (st->codec->bits_per_sample == 24) {
236             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
237             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
238             data_ptr[2] = (buf_ptr[0] >> 4) | ((buf_ptr[1] & 0x0f) << 4);
239             data_ptr += 3;
240         } else {
241             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
242             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
243             data_ptr += 2;
244         }
245     }
246     pkt->size = data_ptr - pkt->data;
247     return 0;
248 }
249
250 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
251 {
252     MXFContext *mxf = s->priv_data;
253     KLVPacket klv;
254
255     while (!url_feof(&s->pb)) {
256         if (klv_read_packet(&klv, &s->pb) < 0) {
257             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
258             return -1;
259         }
260 #ifdef DEBUG
261         PRINT_KEY("read packet", klv.key);
262 #endif
263         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
264             mxf->sync_key = mxf_encrypted_triplet_key;
265             av_log(s, AV_LOG_ERROR, "encrypted triplet not supported\n");
266             return -1;
267         }
268         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
269             int index = mxf_get_stream_index(s, &klv);
270             if (index < 0) {
271                 av_log(s, AV_LOG_ERROR, "error getting stream index\n");
272                 url_fskip(&s->pb, klv.length);
273                 return -1;
274             }
275             /* check for 8 channels AES3 element */
276             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
277                 if (mxf_get_d10_aes3_packet(&s->pb, s->streams[index], pkt, klv.length) < 0) {
278                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
279                     return -1;
280                 }
281             } else
282                 av_get_packet(&s->pb, pkt, klv.length);
283             pkt->stream_index = index;
284             return 0;
285         } else
286             url_fskip(&s->pb, klv.length);
287     }
288     return AVERROR_IO;
289 }
290
291 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
292 {
293     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
294     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
295     mxf->metadata_sets_count++;
296     return 0;
297 }
298
299 static int mxf_read_metadata_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
300 {
301     switch (tag) {
302     case 0x1901:
303         mxf->packages_count = get_be32(pb);
304         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
305             return -1;
306         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
307         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
308         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
309         break;
310     case 0x1902:
311         mxf->essence_container_data_sets_count = get_be32(pb);
312         if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))
313             return -1;
314         mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_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_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));
317         break;
318     }
319     return 0;
320 }
321
322 static int mxf_read_metadata_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
323 {
324     switch(tag) {
325     case 0x0202:
326         source_clip->duration = get_be64(pb);
327         break;
328     case 0x1201:
329         source_clip->start_position = get_be64(pb);
330         break;
331     case 0x1101:
332         /* UMID, only get last 16 bytes */
333         url_fskip(pb, 16);
334         get_buffer(pb, source_clip->source_package_uid, 16);
335         break;
336     case 0x1102:
337         source_clip->source_track_id = get_be32(pb);
338         break;
339     }
340     return 0;
341 }
342
343 static int mxf_read_metadata_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
344 {
345     switch(tag) {
346     case 0x4403:
347         package->tracks_count = get_be32(pb);
348         if (package->tracks_count >= UINT_MAX / sizeof(UID))
349             return -1;
350         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
351         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
352         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
353         break;
354     }
355     return 0;
356 }
357
358 static int mxf_read_metadata_track(MXFTrack *track, ByteIOContext *pb, int tag)
359 {
360     switch(tag) {
361     case 0x4801:
362         track->track_id = get_be32(pb);
363         break;
364     case 0x4804:
365         get_buffer(pb, track->track_number, 4);
366         break;
367     case 0x4B01:
368         track->edit_rate.den = get_be32(pb);
369         track->edit_rate.num = get_be32(pb);
370         break;
371     case 0x4803:
372         get_buffer(pb, track->sequence_ref, 16);
373         break;
374     }
375     return 0;
376 }
377
378 static int mxf_read_metadata_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
379 {
380     switch(tag) {
381     case 0x0202:
382         sequence->duration = get_be64(pb);
383         break;
384     case 0x0201:
385         get_buffer(pb, sequence->data_definition_ul, 16);
386         break;
387     case 0x1001:
388         sequence->structural_components_count = get_be32(pb);
389         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
390             return -1;
391         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
392         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
393         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
394         break;
395     }
396     return 0;
397 }
398
399 static int mxf_read_metadata_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
400 {
401     switch(tag) {
402     case 0x4403:
403         package->tracks_count = get_be32(pb);
404         if (package->tracks_count >= UINT_MAX / sizeof(UID))
405             return -1;
406         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
407         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
408         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
409         break;
410     case 0x4401:
411         /* UMID, only get last 16 bytes */
412         url_fskip(pb, 16);
413         get_buffer(pb, package->package_uid, 16);
414         break;
415     case 0x4701:
416         get_buffer(pb, package->descriptor_ref, 16);
417         break;
418     }
419     return 0;
420 }
421
422 static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
423 {
424     int code;
425
426     do {
427         code = get_byte(pb);
428         dprintf("pixel layout: code 0x%x\n", code);
429         switch (code) {
430         case 0x52: /* R */
431             descriptor->bits_per_sample += get_byte(pb);
432             break;
433         case 0x47: /* G */
434             descriptor->bits_per_sample += get_byte(pb);
435             break;
436         case 0x42: /* B */
437             descriptor->bits_per_sample += get_byte(pb);
438             break;
439         default:
440             get_byte(pb);
441         }
442     } while (code != 0); /* SMPTE 377M E.2.46 */
443 }
444
445 static int mxf_read_metadata_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size)
446 {
447     switch(tag) {
448     case 0x3F01:
449         descriptor->sub_descriptors_count = get_be32(pb);
450         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
451             return -1;
452         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
453         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
454         get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
455         break;
456     case 0x3004:
457         get_buffer(pb, descriptor->essence_container_ul, 16);
458         break;
459     case 0x3006:
460         descriptor->linked_track_id = get_be32(pb);
461         break;
462     case 0x3201: /* PictureEssenceCoding */
463         get_buffer(pb, descriptor->essence_codec_ul, 16);
464         break;
465     case 0x3203:
466         descriptor->width = get_be32(pb);
467         break;
468     case 0x3202:
469         descriptor->height = get_be32(pb);
470         break;
471     case 0x320E:
472         descriptor->aspect_ratio.num = get_be32(pb);
473         descriptor->aspect_ratio.den = get_be32(pb);
474         break;
475     case 0x3D03:
476         descriptor->sample_rate.num = get_be32(pb);
477         descriptor->sample_rate.den = get_be32(pb);
478         break;
479     case 0x3D06: /* SoundEssenceCompression */
480         get_buffer(pb, descriptor->essence_codec_ul, 16);
481         break;
482     case 0x3D07:
483         descriptor->channels = get_be32(pb);
484         break;
485     case 0x3D01:
486         descriptor->bits_per_sample = get_be32(pb);
487         break;
488     case 0x3401:
489         mxf_read_metadata_pixel_layout(pb, descriptor);
490         break;
491     case 0x8201: /* Private tag used by SONY C0023S01.mxf */
492         descriptor->extradata = av_malloc(size);
493         descriptor->extradata_size = size;
494         get_buffer(pb, descriptor->extradata, size);
495         break;
496     }
497     return 0;
498 }
499
500 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
501 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
502     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
503     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
504     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
505     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
506 };
507
508 static const MXFCodecUL mxf_codec_uls[] = {
509     /* PictureEssenceCoding */
510     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
511     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */
512     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
513     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
514     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
515     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
516     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
517     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
518     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
519     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
520     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
521     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
522     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
523     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
524     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
525     /* SoundEssenceCompression */
526     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
527     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
528     { { 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 */
529     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
530     { { 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 */
531     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
532     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
533   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
534     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
535 };
536
537 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
538     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
539     { { 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 */
540     { { 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 */
541     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
542 };
543
544 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
545     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
546     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
547     { { 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 */
548     { { 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 */
549     { { 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 */
550     { { 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 */
551     { { 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 */
552     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
553 };
554
555 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
556 {
557     while (uls->id != CODEC_ID_NONE) {
558         if(!memcmp(uls->uid, *uid, 16))
559             break;
560         uls++;
561     }
562     return uls;
563 }
564
565 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
566 {
567     while (uls->type != CODEC_TYPE_DATA) {
568         if(!memcmp(uls->uid, *uid, 16))
569             break;
570         uls++;
571     }
572     return uls->type;
573 }
574
575 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
576 {
577     int i;
578
579     if (!strong_ref)
580         return NULL;
581     for (i = 0; i < mxf->metadata_sets_count; i++) {
582         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
583             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
584             return mxf->metadata_sets[i];
585         }
586     }
587     return NULL;
588 }
589
590 static int mxf_parse_structural_metadata(MXFContext *mxf)
591 {
592     MXFPackage *material_package = NULL;
593     MXFPackage *temp_package = NULL;
594     int i, j, k;
595
596     dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
597     /* TODO: handle multiple material packages (OP3x) */
598     for (i = 0; i < mxf->packages_count; i++) {
599         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
600         if (material_package) break;
601     }
602     if (!material_package) {
603         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
604         return -1;
605     }
606
607     for (i = 0; i < material_package->tracks_count; i++) {
608         MXFPackage *source_package = NULL;
609         MXFTrack *material_track = NULL;
610         MXFTrack *source_track = NULL;
611         MXFTrack *temp_track = NULL;
612         MXFDescriptor *descriptor = NULL;
613         MXFStructuralComponent *component = NULL;
614         const MXFCodecUL *codec_ul = NULL;
615         const MXFCodecUL *container_ul = NULL;
616         AVStream *st;
617
618         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
619             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
620             continue;
621         }
622
623         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
624             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
625             return -1;
626         }
627
628         /* TODO: handle multiple source clips */
629         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
630             /* TODO: handle timecode component */
631             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
632             if (!component)
633                 continue;
634
635             for (k = 0; k < mxf->packages_count; k++) {
636                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
637                 if (!temp_package)
638                     continue;
639                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
640                     source_package = temp_package;
641                     break;
642                 }
643             }
644             if (!source_package) {
645                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
646                 break;
647             }
648             for (k = 0; k < source_package->tracks_count; k++) {
649                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
650                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
651                     return -1;
652                 }
653                 if (temp_track->track_id == component->source_track_id) {
654                     source_track = temp_track;
655                     break;
656                 }
657             }
658             if (!source_track) {
659                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
660                 break;
661             }
662         }
663         if (!source_track)
664             continue;
665
666         st = av_new_stream(mxf->fc, source_track->track_id);
667         st->priv_data = source_track;
668         st->duration = component->duration;
669         if (st->duration == -1)
670             st->duration = AV_NOPTS_VALUE;
671         st->start_time = component->start_position;
672         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
673
674         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
675             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
676             return -1;
677         }
678
679 #ifdef DEBUG
680         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
681 #endif
682         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
683
684         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
685         if (source_package->descriptor) {
686             if (source_package->descriptor->type == MultipleDescriptor) {
687                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
688                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
689
690                     if (!sub_descriptor) {
691                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
692                         continue;
693                     }
694                     if (sub_descriptor->linked_track_id == source_track->track_id) {
695                         descriptor = sub_descriptor;
696                         break;
697                     }
698                 }
699             } else if (source_package->descriptor->type == Descriptor)
700                 descriptor = source_package->descriptor;
701         }
702         if (!descriptor) {
703             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
704             continue;
705         }
706 #ifdef DEBUG
707         PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
708         PRINT_KEY("essence container ul", descriptor->essence_container_ul);
709 #endif
710         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
711         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
712         st->codec->codec_id = codec_ul->id;
713         if (descriptor->extradata) {
714             st->codec->extradata = descriptor->extradata;
715             st->codec->extradata_size = descriptor->extradata_size;
716         }
717         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
718             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
719             if (st->codec->codec_id == CODEC_ID_NONE)
720                 st->codec->codec_id = container_ul->id;
721             st->codec->width = descriptor->width;
722             st->codec->height = descriptor->height;
723             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
724             st->need_parsing = 2; /* only parse headers */
725         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
726             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
727             if (st->codec->codec_id == CODEC_ID_NONE)
728                 st->codec->codec_id = container_ul->id;
729             st->codec->channels = descriptor->channels;
730             st->codec->bits_per_sample = descriptor->bits_per_sample;
731             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
732             /* TODO: implement CODEC_ID_RAWAUDIO */
733             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
734                 if (descriptor->bits_per_sample == 24)
735                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
736                 else if (descriptor->bits_per_sample == 32)
737                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
738             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
739                 if (descriptor->bits_per_sample == 24)
740                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
741                 else if (descriptor->bits_per_sample == 32)
742                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
743                 if (descriptor->essence_container_ul[13] == 0x01) /* D-10 Mapping */
744                     st->codec->channels = 8; /* force channels to 8 */
745             } else if (st->codec->codec_id == CODEC_ID_MP2) {
746                 st->need_parsing = 1;
747             }
748         }
749         if (container_ul && container_ul->wrapping == Clip) {
750             dprintf("stream %d: clip wrapped essence\n", st->index);
751             st->need_parsing = 1;
752         }
753     }
754     return 0;
755 }
756
757 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
758     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage, 0, AnyType },
759     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package, sizeof(MXFPackage), SourcePackage },
760     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package, sizeof(MXFPackage), MaterialPackage },
761     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence, sizeof(MXFSequence), Sequence },
762     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip, sizeof(MXFStructuralComponent), SourceClip },
763     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
764     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
765     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
766     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
767     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
768     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
769     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
770     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Static Track */
771     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Generic Track */
772     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
773 };
774
775 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
776 {
777     int i, b;
778     for (i = 0; i < size && !url_feof(pb); i++) {
779         b = get_byte(pb);
780         if (b == key[0])
781             i = 0;
782         else if (b != key[i])
783             i = -1;
784     }
785     return i == size;
786 }
787
788 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
789 {
790     ByteIOContext *pb = &mxf->fc->pb;
791     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
792     uint64_t klv_end= url_ftell(pb) + klv->length;
793
794     while (url_ftell(pb) + 4 < klv_end) {
795         int tag = get_be16(pb);
796         int size = get_be16(pb); /* KLV specified by 0x53 */
797         uint64_t next= url_ftell(pb) + size;
798
799         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
800             av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
801             continue;
802         }
803         if(ctx_size && tag == 0x3C0A)
804             get_buffer(pb, ctx->uid, 16);
805         else
806             read_child(ctx, pb, tag, size);
807
808         url_fseek(pb, next, SEEK_SET);
809     }
810     if (ctx_size) ctx->type = type;
811     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
812 }
813
814 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
815 {
816     MXFContext *mxf = s->priv_data;
817     KLVPacket klv;
818
819     mxf->sync_key = mxf_essence_element_key;
820     if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
821         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
822         return -1;
823     }
824     url_fseek(&s->pb, -14, SEEK_CUR);
825     mxf->fc = s;
826     while (!url_feof(&s->pb)) {
827         const MXFMetadataReadTableEntry *function;
828
829         if (klv_read_packet(&klv, &s->pb) < 0) {
830             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
831             return -1;
832         }
833 #ifdef DEBUG
834         PRINT_KEY("read header", klv.key);
835 #endif
836         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
837             /* FIXME avoid seek */
838             url_fseek(&s->pb, klv.offset, SEEK_SET);
839             break;
840         }
841
842         for (function = mxf_metadata_read_table; function->read; function++) {
843             if (IS_KLV_KEY(klv.key, function->key)) {
844                 if (mxf_read_local_tags(mxf, &klv, function->read, function->ctx_size, function->type) < 0) {
845                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
846                     return -1;
847                 }
848                 break;
849             }
850         }
851         if (!function->read)
852             url_fskip(&s->pb, klv.length);
853     }
854     return mxf_parse_structural_metadata(mxf);
855 }
856
857 static int mxf_read_close(AVFormatContext *s)
858 {
859     MXFContext *mxf = s->priv_data;
860     int i;
861
862     av_freep(&mxf->packages_refs);
863     av_freep(&mxf->essence_container_data_sets_refs);
864     for (i = 0; i < mxf->metadata_sets_count; i++) {
865         switch (mxf->metadata_sets[i]->type) {
866         case MultipleDescriptor:
867             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
868             break;
869         case Sequence:
870             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
871             break;
872         case SourcePackage:
873         case MaterialPackage:
874             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
875             break;
876         default:
877             break;
878         }
879         av_freep(&mxf->metadata_sets[i]);
880     }
881     av_freep(&mxf->metadata_sets);
882     return 0;
883 }
884
885 static int mxf_probe(AVProbeData *p) {
886     uint8_t *bufp = p->buf;
887     uint8_t *end = p->buf + p->buf_size;
888
889     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
890         return 0;
891
892     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
893     end -= sizeof(mxf_header_partition_pack_key);
894     for (; bufp < end; bufp++) {
895         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
896             return AVPROBE_SCORE_MAX;
897     }
898     return 0;
899 }
900
901 /* rudimentary binary seek */
902 /* XXX: use MXF Index */
903 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
904 {
905     MXFContext *mxf = s->priv_data;
906     AVStream *st = s->streams[stream_index];
907     int64_t seconds;
908
909     if (!s->bit_rate)
910         return -1;
911     if (sample_time < 0)
912         sample_time = 0;
913     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
914     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
915     if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))
916         return -1;
917
918     /* found KLV key */
919     url_fseek(&s->pb, -12, SEEK_CUR);
920     av_update_cur_dts(s, st, sample_time);
921     return 0;
922 }
923
924 AVInputFormat mxf_demuxer = {
925     "mxf",
926     "MXF format",
927     sizeof(MXFContext),
928     mxf_probe,
929     mxf_read_header,
930     mxf_read_packet,
931     mxf_read_close,
932     mxf_read_seek,
933 };