mxfdec.c
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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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 "libavutil/aes.h"
49 #include "libavutil/mathematics.h"
50 #include "libavcodec/bytestream.h"
51 #include "avformat.h"
52 #include "internal.h"
53 #include "mxf.h"
54 
55 typedef enum {
56  Header,
57  BodyPartition,
58  Footer
59 } MXFPartitionType;
60 
61 typedef enum {
62  OP1a = 1,
63  OP1b,
64  OP1c,
65  OP2a,
66  OP2b,
67  OP2c,
68  OP3a,
69  OP3b,
70  OP3c,
71  OPAtom,
72  OPSonyOpt, /* FATE sample, violates the spec in places */
73 } MXFOP;
74 
75 typedef struct {
76  int closed;
77  int complete;
78  MXFPartitionType type;
79  uint64_t previous_partition;
80  int index_sid;
81  int body_sid;
82  int64_t this_partition;
83  int64_t essence_offset;
84  int64_t essence_length;
85  int32_t kag_size;
86  int64_t header_byte_count;
87  int64_t index_byte_count;
88  int pack_length;
89 } MXFPartition;
90 
91 typedef struct {
92  UID uid;
93  enum MXFMetadataSetType type;
94  UID source_container_ul;
95 } MXFCryptoContext;
96 
97 typedef struct {
98  UID uid;
99  enum MXFMetadataSetType type;
100  UID source_package_uid;
101  UID data_definition_ul;
102  int64_t duration;
103  int64_t start_position;
104  int source_track_id;
105 } MXFStructuralComponent;
106 
107 typedef struct {
108  UID uid;
109  enum MXFMetadataSetType type;
110  UID data_definition_ul;
111  UID *structural_components_refs;
112  int structural_components_count;
113  int64_t duration;
114 } MXFSequence;
115 
116 typedef struct {
117  UID uid;
118  enum MXFMetadataSetType type;
119  MXFSequence *sequence; /* mandatory, and only one */
120  UID sequence_ref;
121  int track_id;
122  uint8_t track_number[4];
123  AVRational edit_rate;
124  int intra_only;
125 } MXFTrack;
126 
127 typedef struct {
128  UID uid;
129  enum MXFMetadataSetType type;
130  UID essence_container_ul;
131  UID essence_codec_ul;
132  AVRational sample_rate;
133  AVRational aspect_ratio;
134  int width;
135  int height; /* Field height, not frame height */
136  int frame_layout; /* See MXFFrameLayout enum */
137  int channels;
138  int bits_per_sample;
139  unsigned int component_depth;
140  unsigned int horiz_subsampling;
141  unsigned int vert_subsampling;
142  UID *sub_descriptors_refs;
143  int sub_descriptors_count;
144  int linked_track_id;
145  uint8_t *extradata;
146  int extradata_size;
147  enum AVPixelFormat pix_fmt;
148 } MXFDescriptor;
149 
150 typedef struct {
151  UID uid;
152  enum MXFMetadataSetType type;
153  int edit_unit_byte_count;
154  int index_sid;
155  int body_sid;
156  AVRational index_edit_rate;
157  uint64_t index_start_position;
158  uint64_t index_duration;
159  int8_t *temporal_offset_entries;
160  int *flag_entries;
161  uint64_t *stream_offset_entries;
162  int nb_index_entries;
163 } MXFIndexTableSegment;
164 
165 typedef struct {
166  UID uid;
167  enum MXFMetadataSetType type;
168  UID package_uid;
169  UID *tracks_refs;
170  int tracks_count;
171  MXFDescriptor *descriptor; /* only one */
172  UID descriptor_ref;
173 } MXFPackage;
174 
175 typedef struct {
176  UID uid;
177  enum MXFMetadataSetType type;
178 } MXFMetadataSet;
179 
180 /* decoded index table */
181 typedef struct {
182  int index_sid;
183  int body_sid;
184  int nb_ptses; /* number of PTSes or total duration of index */
185  int64_t first_dts; /* DTS = EditUnit + first_dts */
186  int64_t *ptses; /* maps EditUnit -> PTS */
187  int nb_segments;
188  MXFIndexTableSegment **segments; /* sorted by IndexStartPosition */
189  AVIndexEntry *fake_index; /* used for calling ff_index_search_timestamp() */
190 } MXFIndexTable;
191 
192 typedef struct {
193  MXFPartition *partitions;
194  unsigned partitions_count;
195  MXFOP op;
196  UID *packages_refs;
197  int packages_count;
198  MXFMetadataSet **metadata_sets;
199  int metadata_sets_count;
200  AVFormatContext *fc;
201  struct AVAES *aesc;
202  uint8_t *local_tags;
203  int local_tags_count;
204  uint64_t footer_partition;
205  KLVPacket current_klv_data;
206  int current_klv_index;
207  int run_in;
208  MXFPartition *current_partition;
209  int parsing_backward;
210  int64_t last_forward_tell;
211  int last_forward_partition;
212  int current_edit_unit;
213  int nb_index_tables;
214  MXFIndexTable *index_tables;
215  int edit_units_per_packet;
216 } MXFContext;
217 
218 enum MXFWrappingScheme {
219  Frame,
220  Clip,
221 };
222 
223 /* NOTE: klv_offset is not set (-1) for local keys */
224 typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset);
225 
226 typedef struct {
227  const UID key;
228  MXFMetadataReadFunc *read;
229  int ctx_size;
230  enum MXFMetadataSetType type;
231 } MXFMetadataReadTableEntry;
232 
233 /* partial keys to match */
234 static const uint8_t mxf_header_partition_pack_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
235 static const uint8_t mxf_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
236 static const uint8_t mxf_avid_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0e,0x04,0x03,0x01 };
237 static const uint8_t mxf_system_item_key[] = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04 };
238 static const uint8_t mxf_klv_key[] = { 0x06,0x0e,0x2b,0x34 };
239 /* complete keys to match */
240 static const uint8_t mxf_crypto_source_container_ul[] = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
241 static const uint8_t mxf_encrypted_triplet_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
242 static const uint8_t mxf_encrypted_essence_container[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
243 static const uint8_t mxf_sony_mpeg4_extradata[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
244 
245 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
246 
247 static int64_t klv_decode_ber_length(AVIOContext *pb)
248 {
249  uint64_t size = avio_r8(pb);
250  if (size & 0x80) { /* long form */
251  int bytes_num = size & 0x7f;
252  /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
253  if (bytes_num > 8)
254  return AVERROR_INVALIDDATA;
255  size = 0;
256  while (bytes_num--)
257  size = size << 8 | avio_r8(pb);
258  }
259  return size;
260 }
261 
262 static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)
263 {
264  int i, b;
265  for (i = 0; i < size && !pb->eof_reached; i++) {
266  b = avio_r8(pb);
267  if (b == key[0])
268  i = 0;
269  else if (b != key[i])
270  i = -1;
271  }
272  return i == size;
273 }
274 
275 static int klv_read_packet(KLVPacket *klv, AVIOContext *pb)
276 {
277  if (!mxf_read_sync(pb, mxf_klv_key, 4))
278  return AVERROR_INVALIDDATA;
279  klv->offset = avio_tell(pb) - 4;
280  memcpy(klv->key, mxf_klv_key, 4);
281  avio_read(pb, klv->key + 4, 12);
282  klv->length = klv_decode_ber_length(pb);
283  return klv->length == -1 ? -1 : 0;
284 }
285 
286 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
287 {
288  int i;
289 
290  for (i = 0; i < s->nb_streams; i++) {
291  MXFTrack *track = s->streams[i]->priv_data;
292  /* SMPTE 379M 7.3 */
293  if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
294  return i;
295  }
296  /* return 0 if only one stream, for OP Atom files with 0 as track number */
297  return s->nb_streams == 1 ? 0 : -1;
298 }
299 
300 /* XXX: use AVBitStreamFilter */
301 static int mxf_get_d10_aes3_packet(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
302 {
303  const uint8_t *buf_ptr, *end_ptr;
304  uint8_t *data_ptr;
305  int i;
306 
307  if (length > 61444) /* worst case PAL 1920 samples 8 channels */
308  return AVERROR_INVALIDDATA;
309  length = av_get_packet(pb, pkt, length);
310  if (length < 0)
311  return length;
312  data_ptr = pkt->data;
313  end_ptr = pkt->data + length;
314  buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */
315  for (; buf_ptr + st->codec->channels*4 < end_ptr; ) {
316  for (i = 0; i < st->codec->channels; i++) {
317  uint32_t sample = bytestream_get_le32(&buf_ptr);
318  if (st->codec->bits_per_coded_sample == 24)
319  bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
320  else
321  bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
322  }
323  buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
324  }
325  av_shrink_packet(pkt, data_ptr - pkt->data);
326  return 0;
327 }
328 
329 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
330 {
331  static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
332  MXFContext *mxf = s->priv_data;
333  AVIOContext *pb = s->pb;
334  int64_t end = avio_tell(pb) + klv->length;
335  int64_t size;
336  uint64_t orig_size;
337  uint64_t plaintext_size;
338  uint8_t ivec[16];
339  uint8_t tmpbuf[16];
340  int index;
341 
342  if (!mxf->aesc && s->key && s->keylen == 16) {
343  mxf->aesc = av_aes_alloc();
344  if (!mxf->aesc)
345  return AVERROR(ENOMEM);
346  av_aes_init(mxf->aesc, s->key, 128, 1);
347  }
348  // crypto context
349  avio_skip(pb, klv_decode_ber_length(pb));
350  // plaintext offset
351  klv_decode_ber_length(pb);
352  plaintext_size = avio_rb64(pb);
353  // source klv key
354  klv_decode_ber_length(pb);
355  avio_read(pb, klv->key, 16);
356  if (!IS_KLV_KEY(klv, mxf_essence_element_key))
357  return AVERROR_INVALIDDATA;
358  index = mxf_get_stream_index(s, klv);
359  if (index < 0)
360  return AVERROR_INVALIDDATA;
361  // source size
362  klv_decode_ber_length(pb);
363  orig_size = avio_rb64(pb);
364  if (orig_size < plaintext_size)
365  return AVERROR_INVALIDDATA;
366  // enc. code
367  size = klv_decode_ber_length(pb);
368  if (size < 32 || size - 32 < orig_size)
369  return AVERROR_INVALIDDATA;
370  avio_read(pb, ivec, 16);
371  avio_read(pb, tmpbuf, 16);
372  if (mxf->aesc)
373  av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
374  if (memcmp(tmpbuf, checkv, 16))
375  av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
376  size -= 32;
377  size = av_get_packet(pb, pkt, size);
378  if (size < 0)
379  return size;
380  else if (size < plaintext_size)
381  return AVERROR_INVALIDDATA;
382  size -= plaintext_size;
383  if (mxf->aesc)
384  av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
385  &pkt->data[plaintext_size], size >> 4, ivec, 1);
386  av_shrink_packet(pkt, orig_size);
387  pkt->stream_index = index;
388  avio_skip(pb, end - avio_tell(pb));
389  return 0;
390 }
391 
392 static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
393 {
394  MXFContext *mxf = arg;
395  int item_num = avio_rb32(pb);
396  int item_len = avio_rb32(pb);
397 
398  if (item_len != 18) {
399  av_log_ask_for_sample(pb, "unsupported primer pack item length %d\n",
400  item_len);
401  return AVERROR_PATCHWELCOME;
402  }
403  if (item_num > UINT_MAX / item_len)
404  return AVERROR_INVALIDDATA;
405  mxf->local_tags_count = item_num;
406  mxf->local_tags = av_malloc(item_num*item_len);
407  if (!mxf->local_tags)
408  return AVERROR(ENOMEM);
409  avio_read(pb, mxf->local_tags, item_num*item_len);
410  return 0;
411 }
412 
413 static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
414 {
415  MXFContext *mxf = arg;
416  MXFPartition *partition, *tmp_part;
417  UID op;
418  uint64_t footer_partition;
419  uint32_t nb_essence_containers;
420 
421  if (mxf->partitions_count+1 >= UINT_MAX / sizeof(*mxf->partitions))
422  return AVERROR(ENOMEM);
423 
424  tmp_part = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));
425  if (!tmp_part)
426  return AVERROR(ENOMEM);
427  mxf->partitions = tmp_part;
428 
429  if (mxf->parsing_backward) {
430  /* insert the new partition pack in the middle
431  * this makes the entries in mxf->partitions sorted by offset */
432  memmove(&mxf->partitions[mxf->last_forward_partition+1],
433  &mxf->partitions[mxf->last_forward_partition],
434  (mxf->partitions_count - mxf->last_forward_partition)*sizeof(*mxf->partitions));
435  partition = mxf->current_partition = &mxf->partitions[mxf->last_forward_partition];
436  } else {
437  mxf->last_forward_partition++;
438  partition = mxf->current_partition = &mxf->partitions[mxf->partitions_count];
439  }
440 
441  memset(partition, 0, sizeof(*partition));
442  mxf->partitions_count++;
443  partition->pack_length = avio_tell(pb) - klv_offset + size;
444 
445  switch(uid[13]) {
446  case 2:
447  partition->type = Header;
448  break;
449  case 3:
450  partition->type = BodyPartition;
451  break;
452  case 4:
453  partition->type = Footer;
454  break;
455  default:
456  av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);
457  return AVERROR_INVALIDDATA;
458  }
459 
460  /* consider both footers to be closed (there is only Footer and CompleteFooter) */
461  partition->closed = partition->type == Footer || !(uid[14] & 1);
462  partition->complete = uid[14] > 2;
463  avio_skip(pb, 4);
464  partition->kag_size = avio_rb32(pb);
465  partition->this_partition = avio_rb64(pb);
466  partition->previous_partition = avio_rb64(pb);
467  footer_partition = avio_rb64(pb);
468  partition->header_byte_count = avio_rb64(pb);
469  partition->index_byte_count = avio_rb64(pb);
470  partition->index_sid = avio_rb32(pb);
471  avio_skip(pb, 8);
472  partition->body_sid = avio_rb32(pb);
473  avio_read(pb, op, sizeof(UID));
474  nb_essence_containers = avio_rb32(pb);
475 
476  /* some files don'thave FooterPartition set in every partition */
477  if (footer_partition) {
478  if (mxf->footer_partition && mxf->footer_partition != footer_partition) {
479  av_log(mxf->fc, AV_LOG_ERROR,
480  "inconsistent FooterPartition value: %"PRIu64" != %"PRIu64"\n",
481  mxf->footer_partition, footer_partition);
482  } else {
483  mxf->footer_partition = footer_partition;
484  }
485  }
486 
487  av_dlog(mxf->fc,
488  "PartitionPack: ThisPartition = 0x%"PRIX64
489  ", PreviousPartition = 0x%"PRIX64", "
490  "FooterPartition = 0x%"PRIX64", IndexSID = %i, BodySID = %i\n",
491  partition->this_partition,
492  partition->previous_partition, footer_partition,
493  partition->index_sid, partition->body_sid);
494 
495  /* sanity check PreviousPartition if set */
496  if (partition->previous_partition &&
497  mxf->run_in + partition->previous_partition >= klv_offset) {
498  av_log(mxf->fc, AV_LOG_ERROR,
499  "PreviousPartition points to this partition or forward\n");
500  return AVERROR_INVALIDDATA;
501  }
502 
503  if (op[12] == 1 && op[13] == 1) mxf->op = OP1a;
504  else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;
505  else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;
506  else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;
507  else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;
508  else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;
509  else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;
510  else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;
511  else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;
512  else if (op[12] == 64&& op[13] == 1) mxf->op = OPSonyOpt;
513  else if (op[12] == 0x10) {
514  /* SMPTE 390m: "There shall be exactly one essence container"
515  * The following block deals with files that violate this, namely:
516  * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a
517  * abcdefghiv016f56415e.mxf - zero ECs, OPAtom, output by Avid AirSpeed */
518  if (nb_essence_containers != 1) {
519  MXFOP op = nb_essence_containers ? OP1a : OPAtom;
520 
521  /* only nag once */
522  if (!mxf->op)
523  av_log(mxf->fc, AV_LOG_WARNING,
524  "\"OPAtom\" with %u ECs - assuming %s\n",
525  nb_essence_containers,
526  op == OP1a ? "OP1a" : "OPAtom");
527 
528  mxf->op = op;
529  } else
530  mxf->op = OPAtom;
531  } else {
532  av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh - guessing OP1a\n", op[12], op[13]);
533  mxf->op = OP1a;
534  }
535 
536  if (partition->kag_size <= 0 || partition->kag_size > (1 << 20)) {
537  av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %i - guessing ", partition->kag_size);
538 
539  if (mxf->op == OPSonyOpt)
540  partition->kag_size = 512;
541  else
542  partition->kag_size = 1;
543 
544  av_log(mxf->fc, AV_LOG_WARNING, "%i\n", partition->kag_size);
545  }
546 
547  return 0;
548 }
549 
550 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
551 {
552  MXFMetadataSet **tmp;
553  if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets))
554  return AVERROR(ENOMEM);
555  tmp = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
556  if (!tmp)
557  return AVERROR(ENOMEM);
558  mxf->metadata_sets = tmp;
559  mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
560  mxf->metadata_sets_count++;
561  return 0;
562 }
563 
564 static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
565 {
566  MXFCryptoContext *cryptocontext = arg;
567  if (size != 16)
568  return AVERROR_INVALIDDATA;
569  if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
570  avio_read(pb, cryptocontext->source_container_ul, 16);
571  return 0;
572 }
573 
574 static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
575 {
576  MXFContext *mxf = arg;
577  switch (tag) {
578  case 0x1901:
579  mxf->packages_count = avio_rb32(pb);
580  if (mxf->packages_count >= UINT_MAX / sizeof(UID))
581  return AVERROR_INVALIDDATA;
582  mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
583  if (!mxf->packages_refs)
584  return AVERROR(ENOMEM);
585  avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
586  avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
587  break;
588  }
589  return 0;
590 }
591 
592 static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
593 {
594  MXFStructuralComponent *source_clip = arg;
595  switch(tag) {
596  case 0x0202:
597  source_clip->duration = avio_rb64(pb);
598  break;
599  case 0x1201:
600  source_clip->start_position = avio_rb64(pb);
601  break;
602  case 0x1101:
603  /* UMID, only get last 16 bytes */
604  avio_skip(pb, 16);
605  avio_read(pb, source_clip->source_package_uid, 16);
606  break;
607  case 0x1102:
608  source_clip->source_track_id = avio_rb32(pb);
609  break;
610  }
611  return 0;
612 }
613 
614 static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
615 {
616  MXFPackage *package = arg;
617  switch(tag) {
618  case 0x4403:
619  package->tracks_count = avio_rb32(pb);
620  if (package->tracks_count >= UINT_MAX / sizeof(UID))
621  return AVERROR_INVALIDDATA;
622  package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
623  if (!package->tracks_refs)
624  return AVERROR(ENOMEM);
625  avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
626  avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
627  break;
628  }
629  return 0;
630 }
631 
632 static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
633 {
634  MXFTrack *track = arg;
635  switch(tag) {
636  case 0x4801:
637  track->track_id = avio_rb32(pb);
638  break;
639  case 0x4804:
640  avio_read(pb, track->track_number, 4);
641  break;
642  case 0x4B01:
643  track->edit_rate.num = avio_rb32(pb);
644  track->edit_rate.den = avio_rb32(pb);
645  break;
646  case 0x4803:
647  avio_read(pb, track->sequence_ref, 16);
648  break;
649  }
650  return 0;
651 }
652 
653 static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
654 {
655  MXFSequence *sequence = arg;
656  switch(tag) {
657  case 0x0202:
658  sequence->duration = avio_rb64(pb);
659  break;
660  case 0x0201:
661  avio_read(pb, sequence->data_definition_ul, 16);
662  break;
663  case 0x1001:
664  sequence->structural_components_count = avio_rb32(pb);
665  if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
666  return AVERROR_INVALIDDATA;
667  sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
668  if (!sequence->structural_components_refs)
669  return AVERROR(ENOMEM);
670  avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
671  avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
672  break;
673  }
674  return 0;
675 }
676 
677 static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
678 {
679  MXFPackage *package = arg;
680  switch(tag) {
681  case 0x4403:
682  package->tracks_count = avio_rb32(pb);
683  if (package->tracks_count >= UINT_MAX / sizeof(UID))
684  return AVERROR_INVALIDDATA;
685  package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
686  if (!package->tracks_refs)
687  return AVERROR(ENOMEM);
688  avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
689  avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
690  break;
691  case 0x4401:
692  /* UMID, only get last 16 bytes */
693  avio_skip(pb, 16);
694  avio_read(pb, package->package_uid, 16);
695  break;
696  case 0x4701:
697  avio_read(pb, package->descriptor_ref, 16);
698  break;
699  }
700  return 0;
701 }
702 
703 static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)
704 {
705  int i, length;
706 
707  segment->nb_index_entries = avio_rb32(pb);
708  if (!segment->nb_index_entries)
709  return 0;
710  else if (segment->nb_index_entries < 0 ||
711  segment->nb_index_entries >
712  (INT_MAX / sizeof(*segment->stream_offset_entries)))
713  return AVERROR(ENOMEM);
714 
715  length = avio_rb32(pb);
716 
717  segment->temporal_offset_entries = av_mallocz(segment->nb_index_entries *
718  sizeof(*segment->temporal_offset_entries));
719  segment->flag_entries = av_mallocz(segment->nb_index_entries *
720  sizeof(*segment->flag_entries));
721  segment->stream_offset_entries = av_mallocz(segment->nb_index_entries *
722  sizeof(*segment->stream_offset_entries));
723 
724  if (!segment->flag_entries || !segment->stream_offset_entries ||
725  !segment->temporal_offset_entries) {
726  av_freep(&segment->flag_entries);
727  av_freep(&segment->stream_offset_entries);
728  av_freep(&segment->temporal_offset_entries);
729  return AVERROR(ENOMEM);
730  }
731 
732  for (i = 0; i < segment->nb_index_entries; i++) {
733  segment->temporal_offset_entries[i] = avio_r8(pb);
734  avio_r8(pb); /* KeyFrameOffset */
735  segment->flag_entries[i] = avio_r8(pb);
736  segment->stream_offset_entries[i] = avio_rb64(pb);
737  avio_skip(pb, length - 11);
738  }
739  return 0;
740 }
741 
742 static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
743 {
744  MXFIndexTableSegment *segment = arg;
745  switch(tag) {
746  case 0x3F05:
747  segment->edit_unit_byte_count = avio_rb32(pb);
748  av_dlog(NULL, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);
749  break;
750  case 0x3F06:
751  segment->index_sid = avio_rb32(pb);
752  av_dlog(NULL, "IndexSID %d\n", segment->index_sid);
753  break;
754  case 0x3F07:
755  segment->body_sid = avio_rb32(pb);
756  av_dlog(NULL, "BodySID %d\n", segment->body_sid);
757  break;
758  case 0x3F0A:
759  av_dlog(NULL, "IndexEntryArray found\n");
760  return mxf_read_index_entry_array(pb, segment);
761  case 0x3F0B:
762  segment->index_edit_rate.num = avio_rb32(pb);
763  segment->index_edit_rate.den = avio_rb32(pb);
764  av_dlog(NULL, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,
765  segment->index_edit_rate.den);
766  break;
767  case 0x3F0C:
768  segment->index_start_position = avio_rb64(pb);
769  av_dlog(NULL, "IndexStartPosition %"PRId64"\n", segment->index_start_position);
770  break;
771  case 0x3F0D:
772  segment->index_duration = avio_rb64(pb);
773  av_dlog(NULL, "IndexDuration %"PRId64"\n", segment->index_duration);
774  break;
775  }
776  return 0;
777 }
778 
779 static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)
780 {
781  int code, value, ofs = 0;
782  char layout[16] = {0};
783 
784  do {
785  code = avio_r8(pb);
786  value = avio_r8(pb);
787  av_dlog(NULL, "pixel layout: code %#x\n", code);
788 
789  if (ofs < 16) {
790  layout[ofs++] = code;
791  layout[ofs++] = value;
792  }
793  } while (code != 0); /* SMPTE 377M E.2.46 */
794 
795  ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);
796 }
797 
798 static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
799 {
800  MXFDescriptor *descriptor = arg;
801  descriptor->pix_fmt = AV_PIX_FMT_NONE;
802  switch(tag) {
803  case 0x3F01:
804  descriptor->sub_descriptors_count = avio_rb32(pb);
805  if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
806  return AVERROR_INVALIDDATA;
807  descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
808  if (!descriptor->sub_descriptors_refs)
809  return AVERROR(ENOMEM);
810  avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
811  avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
812  break;
813  case 0x3004:
814  avio_read(pb, descriptor->essence_container_ul, 16);
815  break;
816  case 0x3006:
817  descriptor->linked_track_id = avio_rb32(pb);
818  break;
819  case 0x3201: /* PictureEssenceCoding */
820  avio_read(pb, descriptor->essence_codec_ul, 16);
821  break;
822  case 0x3203:
823  descriptor->width = avio_rb32(pb);
824  break;
825  case 0x3202:
826  descriptor->height = avio_rb32(pb);
827  break;
828  case 0x320C:
829  descriptor->frame_layout = avio_r8(pb);
830  break;
831  case 0x320E:
832  descriptor->aspect_ratio.num = avio_rb32(pb);
833  descriptor->aspect_ratio.den = avio_rb32(pb);
834  break;
835  case 0x3301:
836  descriptor->component_depth = avio_rb32(pb);
837  break;
838  case 0x3302:
839  descriptor->horiz_subsampling = avio_rb32(pb);
840  break;
841  case 0x3308:
842  descriptor->vert_subsampling = avio_rb32(pb);
843  break;
844  case 0x3D03:
845  descriptor->sample_rate.num = avio_rb32(pb);
846  descriptor->sample_rate.den = avio_rb32(pb);
847  break;
848  case 0x3D06: /* SoundEssenceCompression */
849  avio_read(pb, descriptor->essence_codec_ul, 16);
850  break;
851  case 0x3D07:
852  descriptor->channels = avio_rb32(pb);
853  break;
854  case 0x3D01:
855  descriptor->bits_per_sample = avio_rb32(pb);
856  break;
857  case 0x3401:
858  mxf_read_pixel_layout(pb, descriptor);
859  break;
860  default:
861  /* Private uid used by SONY C0023S01.mxf */
862  if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
863  descriptor->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
864  if (!descriptor->extradata)
865  return AVERROR(ENOMEM);
866  descriptor->extradata_size = size;
867  avio_read(pb, descriptor->extradata, size);
868  }
869  break;
870  }
871  return 0;
872 }
873 
874 /*
875  * Match an uid independently of the version byte and up to len common bytes
876  * Returns: boolean
877  */
878 static int mxf_match_uid(const UID key, const UID uid, int len)
879 {
880  int i;
881  for (i = 0; i < len; i++) {
882  if (i != 7 && key[i] != uid[i])
883  return 0;
884  }
885  return 1;
886 }
887 
888 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
889 {
890  while (uls->uid[0]) {
891  if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
892  break;
893  uls++;
894  }
895  return uls;
896 }
897 
898 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
899 {
900  int i;
901 
902  if (!strong_ref)
903  return NULL;
904  for (i = 0; i < mxf->metadata_sets_count; i++) {
905  if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
906  (type == AnyType || mxf->metadata_sets[i]->type == type)) {
907  return mxf->metadata_sets[i];
908  }
909  }
910  return NULL;
911 }
912 
913 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
914  // video essence container uls
915  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
916  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14, AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
917  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14, AV_CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */
918  { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, AV_CODEC_ID_NONE },
919 };
920 
921 /* EC ULs for intra-only formats */
922 static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {
923  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */
924  { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, AV_CODEC_ID_NONE },
925 };
926 
927 /* intra-only PictureEssenceCoding ULs, where no corresponding EC UL exists */
928 static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {
929  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14, AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */
930  { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, AV_CODEC_ID_NONE },
931 };
932 
933 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
934  // sound essence container uls
935  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
936  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14, AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
937  { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */
938  { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */
939  { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, AV_CODEC_ID_NONE },
940 };
941 
942 static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)
943 {
944  int i, j, nb_segments = 0;
945  MXFIndexTableSegment **unsorted_segments;
946  int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;
947 
948  /* count number of segments, allocate arrays and copy unsorted segments */
949  for (i = 0; i < mxf->metadata_sets_count; i++)
950  if (mxf->metadata_sets[i]->type == IndexTableSegment)
951  nb_segments++;
952 
953  if (!nb_segments)
954  return AVERROR_INVALIDDATA;
955 
956  *sorted_segments = av_mallocz(nb_segments * sizeof(**sorted_segments));
957  unsorted_segments = av_mallocz(nb_segments * sizeof(*unsorted_segments));
958  if (!*sorted_segments || !unsorted_segments) {
959  av_freep(sorted_segments);
960  av_free(unsorted_segments);
961  return AVERROR(ENOMEM);
962  }
963 
964  for (i = j = 0; i < mxf->metadata_sets_count; i++)
965  if (mxf->metadata_sets[i]->type == IndexTableSegment)
966  unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];
967 
968  *nb_sorted_segments = 0;
969 
970  /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */
971  for (i = 0; i < nb_segments; i++) {
972  int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;
973 
974  for (j = 0; j < nb_segments; j++) {
975  MXFIndexTableSegment *s = unsorted_segments[j];
976 
977  /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.
978  * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.
979  */
980  if ((i == 0 || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&
981  (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {
982  best = j;
983  best_body_sid = s->body_sid;
984  best_index_sid = s->index_sid;
985  best_index_start = s->index_start_position;
986  }
987  }
988 
989  /* no suitable entry found -> we're done */
990  if (best == -1)
991  break;
992 
993  (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];
994  last_body_sid = best_body_sid;
995  last_index_sid = best_index_sid;
996  last_index_start = best_index_start;
997  }
998 
999  av_free(unsorted_segments);
1000 
1001  return 0;
1002 }
1003 
1007 static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)
1008 {
1009  int x;
1010  int64_t offset_in = offset; /* for logging */
1011 
1012  for (x = 0; x < mxf->partitions_count; x++) {
1013  MXFPartition *p = &mxf->partitions[x];
1014 
1015  if (p->body_sid != body_sid)
1016  continue;
1017 
1018  if (offset < p->essence_length || !p->essence_length) {
1019  *offset_out = p->essence_offset + offset;
1020  return 0;
1021  }
1022 
1023  offset -= p->essence_length;
1024  }
1025 
1026  av_log(mxf->fc, AV_LOG_ERROR,
1027  "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",
1028  offset_in, body_sid);
1029 
1030  return AVERROR_INVALIDDATA;
1031 }
1032 
1036 static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)
1037 {
1038  int x;
1039  int64_t ret = 0;
1040 
1041  for (x = 0; x < mxf->partitions_count; x++) {
1042  MXFPartition *p = &mxf->partitions[x];
1043 
1044  if (p->body_sid != body_sid)
1045  continue;
1046 
1047  if (!p->essence_length)
1048  return 0;
1049 
1050  ret = p->essence_offset + p->essence_length;
1051  }
1052 
1053  return ret;
1054 }
1055 
1056 /* EditUnit -> absolute offset */
1057 static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, int64_t *edit_unit_out, int64_t *offset_out, int nag)
1058 {
1059  int i;
1060  int64_t offset_temp = 0;
1061 
1062  for (i = 0; i < index_table->nb_segments; i++) {
1063  MXFIndexTableSegment *s = index_table->segments[i];
1064 
1065  edit_unit = FFMAX(edit_unit, s->index_start_position); /* clamp if trying to seek before start */
1066 
1067  if (edit_unit < s->index_start_position + s->index_duration) {
1068  int64_t index = edit_unit - s->index_start_position;
1069 
1070  if (s->edit_unit_byte_count)
1071  offset_temp += s->edit_unit_byte_count * index;
1072  else if (s->nb_index_entries) {
1073  if (s->nb_index_entries == 2 * s->index_duration + 1)
1074  index *= 2; /* Avid index */
1075 
1076  if (index < 0 || index >= s->nb_index_entries) {
1077  av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",
1078  index_table->index_sid, s->index_start_position);
1079  return AVERROR_INVALIDDATA;
1080  }
1081 
1082  offset_temp = s->stream_offset_entries[index];
1083  } else {
1084  av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",
1085  index_table->index_sid, s->index_start_position);
1086  return AVERROR_INVALIDDATA;
1087  }
1088 
1089  if (edit_unit_out)
1090  *edit_unit_out = edit_unit;
1091 
1092  return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);
1093  } else {
1094  /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */
1095  offset_temp += s->edit_unit_byte_count * s->index_duration;
1096  }
1097  }
1098 
1099  if (nag)
1100  av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);
1101 
1102  return AVERROR_INVALIDDATA;
1103 }
1104 
1105 static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)
1106 {
1107  int i, j, x;
1108  int8_t max_temporal_offset = -128;
1109 
1110  /* first compute how many entries we have */
1111  for (i = 0; i < index_table->nb_segments; i++) {
1112  MXFIndexTableSegment *s = index_table->segments[i];
1113 
1114  if (!s->nb_index_entries) {
1115  index_table->nb_ptses = 0;
1116  return 0; /* no TemporalOffsets */
1117  }
1118 
1119  index_table->nb_ptses += s->index_duration;
1120  }
1121 
1122  /* paranoid check */
1123  if (index_table->nb_ptses <= 0)
1124  return 0;
1125 
1126  if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))
1127  return AVERROR(ENOMEM);
1128 
1129  index_table->ptses = av_mallocz(index_table->nb_ptses *
1130  sizeof(int64_t));
1131  index_table->fake_index = av_mallocz(index_table->nb_ptses *
1132  sizeof(AVIndexEntry));
1133  if (!index_table->ptses || !index_table->fake_index) {
1134  av_freep(&index_table->ptses);
1135  return AVERROR(ENOMEM);
1136  }
1137 
1138  /* we may have a few bad TemporalOffsets
1139  * make sure the corresponding PTSes don't have the bogus value 0 */
1140  for (x = 0; x < index_table->nb_ptses; x++)
1141  index_table->ptses[x] = AV_NOPTS_VALUE;
1142 
1170  for (i = x = 0; i < index_table->nb_segments; i++) {
1171  MXFIndexTableSegment *s = index_table->segments[i];
1172  int index_delta = 1;
1173  int n = s->nb_index_entries;
1174 
1175  if (s->nb_index_entries == 2 * s->index_duration + 1) {
1176  index_delta = 2; /* Avid index */
1177  /* ignore the last entry - it's the size of the essence container */
1178  n--;
1179  }
1180 
1181  for (j = 0; j < n; j += index_delta, x++) {
1182  int offset = s->temporal_offset_entries[j] / index_delta;
1183  int index = x + offset;
1184 
1185  if (x >= index_table->nb_ptses) {
1186  av_log(mxf->fc, AV_LOG_ERROR,
1187  "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",
1188  s->nb_index_entries, s->index_duration);
1189  break;
1190  }
1191 
1192  index_table->fake_index[x].timestamp = x;
1193  index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;
1194 
1195  if (index < 0 || index >= index_table->nb_ptses) {
1196  av_log(mxf->fc, AV_LOG_ERROR,
1197  "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",
1198  x, offset, index);
1199  continue;
1200  }
1201 
1202  index_table->ptses[index] = x;
1203  max_temporal_offset = FFMAX(max_temporal_offset, offset);
1204  }
1205  }
1206 
1207  index_table->first_dts = -max_temporal_offset;
1208 
1209  return 0;
1210 }
1211 
1216 static int mxf_compute_index_tables(MXFContext *mxf)
1217 {
1218  int i, j, k, ret, nb_sorted_segments;
1219  MXFIndexTableSegment **sorted_segments = NULL;
1220 
1221  if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||
1222  nb_sorted_segments <= 0) {
1223  av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");
1224  return 0;
1225  }
1226 
1227  /* sanity check and count unique BodySIDs/IndexSIDs */
1228  for (i = 0; i < nb_sorted_segments; i++) {
1229  if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)
1230  mxf->nb_index_tables++;
1231  else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {
1232  av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");
1233  ret = AVERROR_INVALIDDATA;
1234  goto finish_decoding_index;
1235  }
1236  }
1237 
1238  if (mxf->nb_index_tables > INT_MAX / sizeof(MXFIndexTable) ||
1239  !(mxf->index_tables = av_mallocz(mxf->nb_index_tables *
1240  sizeof(MXFIndexTable)))) {
1241  av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");
1242  ret = AVERROR(ENOMEM);
1243  goto finish_decoding_index;
1244  }
1245 
1246  /* distribute sorted segments to index tables */
1247  for (i = j = 0; i < nb_sorted_segments; i++) {
1248  if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {
1249  /* next IndexSID */
1250  j++;
1251  }
1252 
1253  mxf->index_tables[j].nb_segments++;
1254  }
1255 
1256  for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {
1257  MXFIndexTable *t = &mxf->index_tables[j];
1258 
1259  if (t->nb_segments >
1260  (INT_MAX / sizeof(MXFIndexTableSegment *)) ||
1261  !(t->segments = av_mallocz(t->nb_segments *
1262  sizeof(MXFIndexTableSegment*)))) {
1263  av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"
1264  " pointer array\n");
1265  ret = AVERROR(ENOMEM);
1266  goto finish_decoding_index;
1267  }
1268 
1269  if (sorted_segments[i]->index_start_position)
1270  av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",
1271  sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);
1272 
1273  memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));
1274  t->index_sid = sorted_segments[i]->index_sid;
1275  t->body_sid = sorted_segments[i]->body_sid;
1276 
1277  if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)
1278  goto finish_decoding_index;
1279 
1280  /* fix zero IndexDurations */
1281  for (k = 0; k < t->nb_segments; k++) {
1282  if (t->segments[k]->index_duration)
1283  continue;
1284 
1285  if (t->nb_segments > 1)
1286  av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",
1287  t->index_sid, k);
1288 
1289  if (mxf->fc->nb_streams <= 0) {
1290  av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");
1291  break;
1292  }
1293 
1294  /* assume the first stream's duration is reasonable
1295  * leave index_duration = 0 on further segments in case we have any (unlikely)
1296  */
1297  t->segments[k]->index_duration = mxf->fc->streams[0]->duration;
1298  break;
1299  }
1300  }
1301 
1302  ret = 0;
1303 finish_decoding_index:
1304  av_free(sorted_segments);
1305  return ret;
1306 }
1307 
1308 static int mxf_is_intra_only(MXFDescriptor *d)
1309 {
1310  return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,
1311  &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||
1312  mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,
1313  &d->essence_codec_ul)->id != AV_CODEC_ID_NONE;
1314 }
1315 
1316 static int mxf_parse_structural_metadata(MXFContext *mxf)
1317 {
1318  MXFPackage *material_package = NULL;
1319  MXFPackage *temp_package = NULL;
1320  int i, j, k, ret;
1321 
1322  av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
1323  /* TODO: handle multiple material packages (OP3x) */
1324  for (i = 0; i < mxf->packages_count; i++) {
1325  material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
1326  if (material_package) break;
1327  }
1328  if (!material_package) {
1329  av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
1330  return AVERROR_INVALIDDATA;
1331  }
1332 
1333  for (i = 0; i < material_package->tracks_count; i++) {
1334  MXFPackage *source_package = NULL;
1335  MXFTrack *material_track = NULL;
1336  MXFTrack *source_track = NULL;
1337  MXFTrack *temp_track = NULL;
1338  MXFDescriptor *descriptor = NULL;
1339  MXFStructuralComponent *component = NULL;
1340  UID *essence_container_ul = NULL;
1341  const MXFCodecUL *codec_ul = NULL;
1342  const MXFCodecUL *container_ul = NULL;
1343  const MXFCodecUL *pix_fmt_ul = NULL;
1344  AVStream *st;
1345 
1346  if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
1347  av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
1348  continue;
1349  }
1350 
1351  if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
1352  av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
1353  continue;
1354  }
1355 
1356  /* TODO: handle multiple source clips */
1357  for (j = 0; j < material_track->sequence->structural_components_count; j++) {
1358  /* TODO: handle timecode component */
1359  component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
1360  if (!component)
1361  continue;
1362 
1363  for (k = 0; k < mxf->packages_count; k++) {
1364  temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
1365  if (!temp_package)
1366  continue;
1367  if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
1368  source_package = temp_package;
1369  break;
1370  }
1371  }
1372  if (!source_package) {
1373  av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);
1374  break;
1375  }
1376  for (k = 0; k < source_package->tracks_count; k++) {
1377  if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
1378  av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
1379  ret = AVERROR_INVALIDDATA;
1380  goto fail_and_free;
1381  }
1382  if (temp_track->track_id == component->source_track_id) {
1383  source_track = temp_track;
1384  break;
1385  }
1386  }
1387  if (!source_track) {
1388  av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
1389  break;
1390  }
1391  }
1392  if (!source_track || !component)
1393  continue;
1394 
1395  if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
1396  av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
1397  ret = AVERROR_INVALIDDATA;
1398  goto fail_and_free;
1399  }
1400 
1401  /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf
1402  * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */
1403  if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {
1404  av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);
1405  continue;
1406  }
1407 
1408  st = avformat_new_stream(mxf->fc, NULL);
1409  if (!st) {
1410  av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
1411  ret = AVERROR(ENOMEM);
1412  goto fail_and_free;
1413  }
1414  st->id = source_track->track_id;
1415  st->priv_data = source_track;
1416  st->duration = component->duration;
1417  if (st->duration == -1)
1418  st->duration = AV_NOPTS_VALUE;
1419  st->start_time = component->start_position;
1420  avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);
1421 
1422  PRINT_KEY(mxf->fc, "data definition ul", source_track->sequence->data_definition_ul);
1423  codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
1424  st->codec->codec_type = codec_ul->id;
1425 
1426  source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
1427  if (source_package->descriptor) {
1428  if (source_package->descriptor->type == MultipleDescriptor) {
1429  for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
1430  MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
1431 
1432  if (!sub_descriptor) {
1433  av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
1434  continue;
1435  }
1436  if (sub_descriptor->linked_track_id == source_track->track_id) {
1437  descriptor = sub_descriptor;
1438  break;
1439  }
1440  }
1441  } else if (source_package->descriptor->type == Descriptor)
1442  descriptor = source_package->descriptor;
1443  }
1444  if (!descriptor) {
1445  av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
1446  continue;
1447  }
1448  PRINT_KEY(mxf->fc, "essence codec ul", descriptor->essence_codec_ul);
1449  PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
1450  essence_container_ul = &descriptor->essence_container_ul;
1451  /* HACK: replacing the original key with mxf_encrypted_essence_container
1452  * is not allowed according to s429-6, try to find correct information anyway */
1453  if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
1454  av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
1455  for (k = 0; k < mxf->metadata_sets_count; k++) {
1456  MXFMetadataSet *metadata = mxf->metadata_sets[k];
1457  if (metadata->type == CryptoContext) {
1458  essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
1459  break;
1460  }
1461  }
1462  }
1463 
1464  /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
1465  codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
1466  st->codec->codec_id = codec_ul->id;
1467  if (descriptor->extradata) {
1468  st->codec->extradata = descriptor->extradata;
1469  st->codec->extradata_size = descriptor->extradata_size;
1470  }
1471  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1472  source_track->intra_only = mxf_is_intra_only(descriptor);
1473  container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
1474  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1475  st->codec->codec_id = container_ul->id;
1476  st->codec->width = descriptor->width;
1477  /* Field height, not frame height */
1478  st->codec->height = descriptor->height;
1479  switch (descriptor->frame_layout) {
1480  case SegmentedFrame:
1481  /* This one is a weird layout I don't fully understand. */
1482  av_log(mxf->fc, AV_LOG_INFO,
1483  "SegmentedFrame layout isn't currently supported\n");
1484  break;
1485  case FullFrame:
1486  break;
1487  case OneField:
1488  /* Every other line is stored and needs to be duplicated. */
1489  av_log(mxf->fc, AV_LOG_INFO,
1490  "OneField frame layout isn't currently supported\n");
1491  break;
1492  /* The correct thing to do here is fall through, but by
1493  * breaking we might be able to decode some streams at half
1494  * the vertical resolution, rather than not al all.
1495  * It's also for compatibility with the old behavior. */
1496  case SeparateFields:
1497  case MixedFields:
1498  /* Turn field height into frame height. */
1499  st->codec->height *= 2;
1500  default:
1501  av_log(mxf->fc, AV_LOG_INFO,
1502  "Unknown frame layout type: %d\n",
1503  descriptor->frame_layout);
1504  }
1505  if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
1506  st->codec->pix_fmt = descriptor->pix_fmt;
1507  if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {
1508  pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,
1509  &descriptor->essence_codec_ul);
1510  st->codec->pix_fmt = pix_fmt_ul->id;
1511  if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {
1512  /* support files created before RP224v10 by defaulting to UYVY422
1513  if subsampling is 4:2:2 and component depth is 8-bit */
1514  if (descriptor->horiz_subsampling == 2 &&
1515  descriptor->vert_subsampling == 1 &&
1516  descriptor->component_depth == 8) {
1517  st->codec->pix_fmt = AV_PIX_FMT_UYVY422;
1518  }
1519  }
1520  }
1521  }
1522  st->need_parsing = AVSTREAM_PARSE_HEADERS;
1523  } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
1524  container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
1525  if (st->codec->codec_id == AV_CODEC_ID_NONE)
1526  st->codec->codec_id = container_ul->id;
1527  st->codec->channels = descriptor->channels;
1528  st->codec->bits_per_coded_sample = descriptor->bits_per_sample;
1529 
1530  if (descriptor->sample_rate.den > 0)
1531  st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
1532 
1533  /* TODO: implement AV_CODEC_ID_RAWAUDIO */
1534  if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {
1535  if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
1536  st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
1537  else if (descriptor->bits_per_sample == 32)
1538  st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
1539  } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
1540  if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
1541  st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;
1542  else if (descriptor->bits_per_sample == 32)
1543  st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
1544  } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {
1545  st->need_parsing = AVSTREAM_PARSE_FULL;
1546  }
1547  }
1548  if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
1549  /* TODO: decode timestamps */
1550  st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
1551  }
1552  }
1553 
1554  ret = 0;
1555 fail_and_free:
1556  return ret;
1557 }
1558 
1559 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
1560  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
1561  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },
1562  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },
1563  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },
1564  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },
1565  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },
1566  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },
1567  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },
1568  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },
1569  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },
1570  { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },
1571  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
1572  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
1573  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
1574  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
1575  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
1576  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
1577  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
1578  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
1579  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
1580  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
1581  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
1582  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
1583  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
1584  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
1585  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
1586  { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
1587  { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
1588 };
1589 
1590 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)
1591 {
1592  AVIOContext *pb = mxf->fc->pb;
1593  MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
1594  uint64_t klv_end = avio_tell(pb) + klv->length;
1595 
1596  if (!ctx)
1597  return AVERROR(ENOMEM);
1598  while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {
1599  int ret;
1600  int tag = avio_rb16(pb);
1601  int size = avio_rb16(pb); /* KLV specified by 0x53 */
1602  uint64_t next = avio_tell(pb) + size;
1603  UID uid = {0};
1604 
1605  av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);
1606  if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
1607  av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
1608  continue;
1609  }
1610  if (tag > 0x7FFF) { /* dynamic tag */
1611  int i;
1612  for (i = 0; i < mxf->local_tags_count; i++) {
1613  int local_tag = AV_RB16(mxf->local_tags+i*18);
1614  if (local_tag == tag) {
1615  memcpy(uid, mxf->local_tags+i*18+2, 16);
1616  av_dlog(mxf->fc, "local tag %#04x\n", local_tag);
1617  PRINT_KEY(mxf->fc, "uid", uid);
1618  }
1619  }
1620  }
1621  if (ctx_size && tag == 0x3C0A)
1622  avio_read(pb, ctx->uid, 16);
1623  else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)
1624  return ret;
1625 
1626  /* Accept the 64k local set limit being exceeded (Avid). Don't accept
1627  * it extending past the end of the KLV though (zzuf5.mxf). */
1628  if (avio_tell(pb) > klv_end) {
1629  av_log(mxf->fc, AV_LOG_ERROR,
1630  "local tag %#04x extends past end of local set @ %#"PRIx64"\n",
1631  tag, klv->offset);
1632  return AVERROR_INVALIDDATA;
1633  } else if (avio_tell(pb) <= next) /* only seek forward, else this can loop for a long time */
1634  avio_seek(pb, next, SEEK_SET);
1635  }
1636  if (ctx_size) ctx->type = type;
1637  return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
1638 }
1639 
1644 static int mxf_seek_to_previous_partition(MXFContext *mxf)
1645 {
1646  AVIOContext *pb = mxf->fc->pb;
1647 
1648  if (!mxf->current_partition ||
1649  mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)
1650  return 0; /* we've parsed all partitions */
1651 
1652  /* seek to previous partition */
1653  avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);
1654  mxf->current_partition = NULL;
1655 
1656  av_dlog(mxf->fc, "seeking to previous partition\n");
1657 
1658  return 1;
1659 }
1660 
1665 static int mxf_parse_handle_essence(MXFContext *mxf)
1666 {
1667  AVIOContext *pb = mxf->fc->pb;
1668  int64_t ret;
1669 
1670  if (mxf->parsing_backward) {
1671  return mxf_seek_to_previous_partition(mxf);
1672  } else {
1673  if (!mxf->footer_partition) {
1674  av_dlog(mxf->fc, "no footer\n");
1675  return 0;
1676  }
1677 
1678  av_dlog(mxf->fc, "seeking to footer\n");
1679 
1680  /* remember where we were so we don't end up seeking further back than this */
1681  mxf->last_forward_tell = avio_tell(pb);
1682 
1683  if (!pb->seekable) {
1684  av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");
1685  return -1;
1686  }
1687 
1688  /* seek to footer partition and parse backward */
1689  if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {
1690  av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",
1691  mxf->run_in + mxf->footer_partition, ret);
1692  return ret;
1693  }
1694 
1695  mxf->current_partition = NULL;
1696  mxf->parsing_backward = 1;
1697  }
1698 
1699  return 1;
1700 }
1701 
1706 static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)
1707 {
1708  return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;
1709 }
1710 
1715 static void mxf_compute_essence_containers(MXFContext *mxf)
1716 {
1717  int x;
1718 
1719  /* everything is already correct */
1720  if (mxf->op == OPAtom)
1721  return;
1722 
1723  for (x = 0; x < mxf->partitions_count; x++) {
1724  MXFPartition *p = &mxf->partitions[x];
1725 
1726  if (!p->body_sid)
1727  continue; /* BodySID == 0 -> no essence */
1728 
1729  if (x >= mxf->partitions_count - 1)
1730  break; /* last partition - can't compute length (and we don't need to) */
1731 
1732  /* essence container spans to the next partition */
1733  p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;
1734 
1735  if (p->essence_length < 0) {
1736  /* next ThisPartition < essence_offset */
1737  p->essence_length = 0;
1738  av_log(mxf->fc, AV_LOG_ERROR,
1739  "partition %i: bad ThisPartition = %"PRIX64"\n",
1740  x+1, mxf->partitions[x+1].this_partition);
1741  }
1742  }
1743 }
1744 
1745 static int64_t round_to_kag(int64_t position, int kag_size)
1746 {
1747  /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */
1748  /* NOTE: kag_size may be any integer between 1 - 2^10 */
1749  int64_t ret = (position / kag_size) * kag_size;
1750  return ret == position ? ret : ret + kag_size;
1751 }
1752 
1753 static inline void compute_partition_essence_offset(AVFormatContext *s,
1754  MXFContext *mxf,
1755  KLVPacket *klv)
1756 {
1757  MXFPartition *cur_part = mxf->current_partition;
1758  /* for OP1a we compute essence_offset
1759  * for OPAtom we point essence_offset after the KL
1760  * (usually op1a_essence_offset + 20 or 25)
1761  * TODO: for OP1a we could eliminate this entire if statement, always
1762  * stopping parsing at op1a_essence_offset
1763  * for OPAtom we still need the actual essence_offset though
1764  * (the KL's length can vary)
1765  */
1766  int64_t op1a_essence_offset =
1767  round_to_kag(cur_part->this_partition + cur_part->pack_length,
1768  cur_part->kag_size) +
1769  round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +
1770  round_to_kag(cur_part->index_byte_count, cur_part->kag_size);
1771 
1772  if (mxf->op == OPAtom) {
1773  /* point essence_offset to the actual data
1774  * OPAtom has all the essence in one big KLV
1775  */
1776  cur_part->essence_offset = avio_tell(s->pb);
1777  cur_part->essence_length = klv->length;
1778  } else {
1779  /* NOTE: op1a_essence_offset may be less than to klv.offset
1780  * (C0023S01.mxf) */
1781  cur_part->essence_offset = op1a_essence_offset;
1782  }
1783 }
1784 
1785 static int is_pcm(enum AVCodecID codec_id)
1786 {
1787  /* we only care about "normal" PCM codecs until we get samples */
1788  return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;
1789 }
1790 
1796 static void mxf_handle_small_eubc(AVFormatContext *s)
1797 {
1798  MXFContext *mxf = s->priv_data;
1799 
1800  /* assuming non-OPAtom == frame wrapped
1801  * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */
1802  if (mxf->op != OPAtom)
1803  return;
1804 
1805  /* expect PCM with exactly one index table segment and a small (< 32) EUBC */
1806  if (s->nb_streams != 1 ||
1807  s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||
1808  !is_pcm(s->streams[0]->codec->codec_id) ||
1809  mxf->nb_index_tables != 1 ||
1810  mxf->index_tables[0].nb_segments != 1 ||
1811  mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)
1812  return;
1813 
1814  /* arbitrarily default to 48 kHz PAL audio frame size */
1815  /* TODO: We could compute this from the ratio between the audio
1816  * and video edit rates for 48 kHz NTSC we could use the
1817  * 1802-1802-1802-1802-1801 pattern. */
1818  mxf->edit_units_per_packet = 1920;
1819 }
1820 
1821 static int mxf_read_header(AVFormatContext *s)
1822 {
1823  MXFContext *mxf = s->priv_data;
1824  KLVPacket klv;
1825  int64_t essence_offset = 0;
1826  int ret;
1827 
1828  mxf->last_forward_tell = INT64_MAX;
1829  mxf->edit_units_per_packet = 1;
1830 
1831  if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
1832  av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
1833  return AVERROR_INVALIDDATA;
1834  }
1835  avio_seek(s->pb, -14, SEEK_CUR);
1836  mxf->fc = s;
1837  mxf->run_in = avio_tell(s->pb);
1838 
1839  while (!s->pb->eof_reached) {
1840  const MXFMetadataReadTableEntry *metadata;
1841 
1842  if (klv_read_packet(&klv, s->pb) < 0) {
1843  /* EOF - seek to previous partition or stop */
1844  if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
1845  break;
1846  else
1847  continue;
1848  }
1849 
1850  PRINT_KEY(s, "read header", klv.key);
1851  av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
1852  if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
1853  IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
1854  IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||
1855  IS_KLV_KEY(klv.key, mxf_system_item_key)) {
1856 
1857  if (!mxf->current_partition) {
1858  av_log(mxf->fc, AV_LOG_ERROR,
1859  "found essence prior to first PartitionPack\n");
1860  return AVERROR_INVALIDDATA;
1861  }
1862 
1863  if (!mxf->current_partition->essence_offset) {
1864  compute_partition_essence_offset(s, mxf, &klv);
1865  }
1866 
1867  if (!essence_offset)
1868  essence_offset = klv.offset;
1869 
1870  /* seek to footer, previous partition or stop */
1871  if (mxf_parse_handle_essence(mxf) <= 0)
1872  break;
1873  continue;
1874  } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&
1875  klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {
1876  /* next partition pack - keep going, seek to previous partition or stop */
1877  if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
1878  break;
1879  else if (mxf->parsing_backward)
1880  continue;
1881  /* we're still parsing forward. proceed to parsing this partition pack */
1882  }
1883 
1884  for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
1885  if (IS_KLV_KEY(klv.key, metadata->key)) {
1886  int res;
1887  if (klv.key[5] == 0x53) {
1888  res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);
1889  } else {
1890  uint64_t next = avio_tell(s->pb) + klv.length;
1891  res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);
1892 
1893  /* only seek forward, else this can loop for a long time */
1894  if (avio_tell(s->pb) > next) {
1895  av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",
1896  klv.offset);
1897  return AVERROR_INVALIDDATA;
1898  }
1899 
1900  avio_seek(s->pb, next, SEEK_SET);
1901  }
1902  if (res < 0) {
1903  av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
1904  return res;
1905  }
1906  break;
1907  }
1908  }
1909  if (!metadata->read)
1910  avio_skip(s->pb, klv.length);
1911  }
1912  /* FIXME avoid seek */
1913  if (!essence_offset) {
1914  av_log(s, AV_LOG_ERROR, "no essence\n");
1915  return AVERROR_INVALIDDATA;
1916  }
1917  avio_seek(s->pb, essence_offset, SEEK_SET);
1918 
1919  mxf_compute_essence_containers(mxf);
1920 
1921  /* we need to do this before computing the index tables
1922  * to be able to fill in zero IndexDurations with st->duration */
1923  if ((ret = mxf_parse_structural_metadata(mxf)) < 0)
1924  return ret;
1925 
1926  if ((ret = mxf_compute_index_tables(mxf)) < 0)
1927  return ret;
1928 
1929  if (mxf->nb_index_tables > 1) {
1930  /* TODO: look up which IndexSID to use via EssenceContainerData */
1931  av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",
1932  mxf->nb_index_tables, mxf->index_tables[0].index_sid);
1933  } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {
1934  av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");
1935  return AVERROR_INVALIDDATA;
1936  }
1937 
1938  mxf_handle_small_eubc(s);
1939 
1940  return 0;
1941 }
1942 
1947 static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)
1948 {
1949  int64_t last_ofs = -1, next_ofs = -1;
1950  MXFIndexTable *t = &mxf->index_tables[0];
1951 
1952  /* this is called from the OP1a demuxing logic, which means there
1953  * may be no index tables */
1954  if (mxf->nb_index_tables <= 0)
1955  return -1;
1956 
1957  /* find mxf->current_edit_unit so that the next edit unit starts ahead
1958  * of current_offset */
1959  while (mxf->current_edit_unit >= 0) {
1960  if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,
1961  NULL, &next_ofs, 0) < 0)
1962  return -1;
1963 
1964  if (next_ofs <= last_ofs) {
1965  /* large next_ofs didn't change or current_edit_unit wrapped
1966  * around this fixes the infinite loop on zzuf3.mxf */
1967  av_log(mxf->fc, AV_LOG_ERROR,
1968  "next_ofs didn't change. not deriving packet timestamps\n");
1969  return -1;
1970  }
1971 
1972  if (next_ofs > current_offset)
1973  break;
1974 
1975  last_ofs = next_ofs;
1976  mxf->current_edit_unit++;
1977  }
1978 
1979  /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files
1980  * may lack IndexEntryArrays */
1981  if (mxf->current_edit_unit < 0)
1982  return -1;
1983 
1984  return next_ofs;
1985 }
1986 
1987 static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)
1988 {
1989  KLVPacket klv;
1990  MXFContext *mxf = s->priv_data;
1991 
1992  while (!s->pb->eof_reached) {
1993  if (klv_read_packet(&klv, s->pb) < 0)
1994  return -1;
1995  PRINT_KEY(s, "read packet", klv.key);
1996  av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
1997  if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
1998  int res = mxf_decrypt_triplet(s, pkt, &klv);
1999  if (res < 0) {
2000  av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
2001  return -1;
2002  }
2003  return 0;
2004  }
2005  if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
2006  IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {
2007  int index = mxf_get_stream_index(s, &klv);
2008  int64_t next_ofs, next_klv;
2009  AVStream *st;
2010  MXFTrack *track;
2011 
2012  if (index < 0) {
2013  av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));
2014  goto skip;
2015  }
2016 
2017  st = s->streams[index];
2018  track = st->priv_data;
2019 
2020  if (s->streams[index]->discard == AVDISCARD_ALL)
2021  goto skip;
2022 
2023  next_klv = avio_tell(s->pb) + klv.length;
2024  next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);
2025 
2026  if (next_ofs >= 0 && next_klv > next_ofs) {
2027  /* if this check is hit then it's possible OPAtom was treated
2028  * as OP1a truncate the packet since it's probably very large
2029  * (>2 GiB is common) */
2030  av_log_ask_for_sample(s,
2031  "KLV for edit unit %i extends into next "
2032  "edit unit - OPAtom misinterpreted as "
2033  "OP1a?\n",
2034  mxf->current_edit_unit);
2035  klv.length = next_ofs - avio_tell(s->pb);
2036  }
2037 
2038  /* check for 8 channels AES3 element */
2039  if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
2040  if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
2041  av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
2042  return -1;
2043  }
2044  } else {
2045  int ret = av_get_packet(s->pb, pkt, klv.length);
2046  if (ret < 0)
2047  return ret;
2048  }
2049  pkt->stream_index = index;
2050  pkt->pos = klv.offset;
2051 
2052  if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {
2053  /* mxf->current_edit_unit good - see if we have an
2054  * index table to derive timestamps from */
2055  MXFIndexTable *t = &mxf->index_tables[0];
2056 
2057  if (mxf->nb_index_tables >= 1 &&
2058  mxf->current_edit_unit < t->nb_ptses) {
2059  pkt->dts = mxf->current_edit_unit + t->first_dts;
2060  pkt->pts = t->ptses[mxf->current_edit_unit];
2061  } else if (track->intra_only) {
2062  /* intra-only -> PTS = EditUnit.
2063  * let utils.c figure out DTS since it can be
2064  * < PTS if low_delay = 0 (Sony IMX30) */
2065  pkt->pts = mxf->current_edit_unit;
2066  }
2067  }
2068 
2069  /* seek for truncated packets */
2070  avio_seek(s->pb, next_klv, SEEK_SET);
2071 
2072  return 0;
2073  } else
2074  skip:
2075  avio_skip(s->pb, klv.length);
2076  }
2077  return AVERROR_EOF;
2078 }
2079 
2080 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
2081 {
2082  MXFContext *mxf = s->priv_data;
2083  int ret, size;
2084  int64_t ret64, pos, next_pos;
2085  AVStream *st;
2086  MXFIndexTable *t;
2087  int edit_units;
2088 
2089  if (mxf->op != OPAtom)
2090  return mxf_read_packet_old(s, pkt);
2091 
2092  /* OPAtom - clip wrapped demuxing */
2093  /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */
2094  st = s->streams[0];
2095  t = &mxf->index_tables[0];
2096 
2097  if (mxf->current_edit_unit >= st->duration)
2098  return AVERROR_EOF;
2099 
2100  edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);
2101 
2102  if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)
2103  return ret;
2104 
2105  /* compute size by finding the next edit unit or the end of the essence container
2106  * not pretty, but it works */
2107  if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&
2108  (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {
2109  av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");
2110  return AVERROR_INVALIDDATA;
2111  }
2112 
2113  if ((size = next_pos - pos) <= 0) {
2114  av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);
2115  return AVERROR_INVALIDDATA;
2116  }
2117 
2118  if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)
2119  return ret64;
2120 
2121  if ((ret = av_get_packet(s->pb, pkt, size)) != size)
2122  return ret < 0 ? ret : AVERROR_EOF;
2123 
2124  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&
2125  mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {
2126  pkt->dts = mxf->current_edit_unit + t->first_dts;
2127  pkt->pts = t->ptses[mxf->current_edit_unit];
2128  }
2129 
2130  pkt->stream_index = 0;
2131  mxf->current_edit_unit += edit_units;
2132 
2133  return 0;
2134 }
2135 
2136 
2137 static int mxf_read_close(AVFormatContext *s)
2138 {
2139  MXFContext *mxf = s->priv_data;
2140  MXFIndexTableSegment *seg;
2141  int i;
2142 
2143  av_freep(&mxf->packages_refs);
2144 
2145  for (i = 0; i < s->nb_streams; i++)
2146  s->streams[i]->priv_data = NULL;
2147 
2148  for (i = 0; i < mxf->metadata_sets_count; i++) {
2149  switch (mxf->metadata_sets[i]->type) {
2150  case MultipleDescriptor:
2151  av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
2152  break;
2153  case Sequence:
2154  av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
2155  break;
2156  case SourcePackage:
2157  case MaterialPackage:
2158  av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
2159  break;
2160  case IndexTableSegment:
2161  seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];
2162  av_freep(&seg->temporal_offset_entries);
2163  av_freep(&seg->flag_entries);
2164  av_freep(&seg->stream_offset_entries);
2165  break;
2166  default:
2167  break;
2168  }
2169  av_freep(&mxf->metadata_sets[i]);
2170  }
2171  av_freep(&mxf->partitions);
2172  av_freep(&mxf->metadata_sets);
2173  av_freep(&mxf->aesc);
2174  av_freep(&mxf->local_tags);
2175 
2176  for (i = 0; i < mxf->nb_index_tables; i++) {
2177  av_freep(&mxf->index_tables[i].segments);
2178  av_freep(&mxf->index_tables[i].ptses);
2179  av_freep(&mxf->index_tables[i].fake_index);
2180  }
2181  av_freep(&mxf->index_tables);
2182 
2183  return 0;
2184 }
2185 
2186 static int mxf_probe(AVProbeData *p) {
2187  uint8_t *bufp = p->buf;
2188  uint8_t *end = p->buf + p->buf_size;
2189 
2190  if (p->buf_size < sizeof(mxf_header_partition_pack_key))
2191  return 0;
2192 
2193  /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
2194  end -= sizeof(mxf_header_partition_pack_key);
2195  for (; bufp < end; bufp++) {
2196  if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
2197  return AVPROBE_SCORE_MAX;
2198  }
2199  return 0;
2200 }
2201 
2202 /* rudimentary byte seek */
2203 /* XXX: use MXF Index */
2204 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
2205 {
2206  AVStream *st = s->streams[stream_index];
2207  int64_t seconds;
2208  MXFContext* mxf = s->priv_data;
2209  int64_t seekpos;
2210  int ret;
2211  MXFIndexTable *t;
2212 
2213  if (mxf->nb_index_tables <= 0) {
2214  if (!s->bit_rate)
2215  return AVERROR_INVALIDDATA;
2216  if (sample_time < 0)
2217  sample_time = 0;
2218  seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
2219 
2220  if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)
2221  return ret;
2222  ff_update_cur_dts(s, st, sample_time);
2223  } else {
2224  t = &mxf->index_tables[0];
2225 
2226  /* clamp above zero, else ff_index_search_timestamp() returns negative
2227  * this also means we allow seeking before the start */
2228  sample_time = FFMAX(sample_time, 0);
2229 
2230  if (t->fake_index) {
2231  /* behave as if we have a proper index */
2232  if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)
2233  return sample_time;
2234  } else {
2235  /* no IndexEntryArray (one or more CBR segments)
2236  * make sure we don't seek past the end */
2237  sample_time = FFMIN(sample_time, st->duration - 1);
2238  }
2239 
2240  if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)
2241  return ret;
2242 
2243  ff_update_cur_dts(s, st, sample_time);
2244  mxf->current_edit_unit = sample_time;
2245  avio_seek(s->pb, seekpos, SEEK_SET);
2246  }
2247  return 0;
2248 }
2249 
2250 AVInputFormat ff_mxf_demuxer = {
2251  .name = "mxf",
2252  .long_name = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),
2253  .priv_data_size = sizeof(MXFContext),
2254  .read_probe = mxf_probe,
2255  .read_header = mxf_read_header,
2256  .read_packet = mxf_read_packet,
2257  .read_close = mxf_read_close,
2258  .read_seek = mxf_read_seek,
2259 };