00001 /* 00002 * MXF demuxer. 00003 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 /* 00023 * References 00024 * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value 00025 * SMPTE 377M MXF File Format Specifications 00026 * SMPTE 378M Operational Pattern 1a 00027 * SMPTE 379M MXF Generic Container 00028 * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container 00029 * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container 00030 * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container 00031 * 00032 * Principle 00033 * Search for Track numbers which will identify essence element KLV packets. 00034 * Search for SourcePackage which define tracks which contains Track numbers. 00035 * Material Package contains tracks with reference to SourcePackage tracks. 00036 * Search for Descriptors (Picture, Sound) which contains codec info and parameters. 00037 * Assign Descriptors to correct Tracks. 00038 * 00039 * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext. 00040 * Metadata parsing resolves Strong References to objects. 00041 * 00042 * Simple demuxer, only OP1A supported and some files might not work at all. 00043 * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1 00044 */ 00045 00046 //#define DEBUG 00047 00048 #include "libavutil/aes.h" 00049 #include "libavcodec/bytestream.h" 00050 #include "avformat.h" 00051 #include "mxf.h" 00052 00053 typedef struct { 00054 UID uid; 00055 enum MXFMetadataSetType type; 00056 UID source_container_ul; 00057 } MXFCryptoContext; 00058 00059 typedef struct { 00060 UID uid; 00061 enum MXFMetadataSetType type; 00062 UID source_package_uid; 00063 UID data_definition_ul; 00064 int64_t duration; 00065 int64_t start_position; 00066 int source_track_id; 00067 } MXFStructuralComponent; 00068 00069 typedef struct { 00070 UID uid; 00071 enum MXFMetadataSetType type; 00072 UID data_definition_ul; 00073 UID *structural_components_refs; 00074 int structural_components_count; 00075 int64_t duration; 00076 } MXFSequence; 00077 00078 typedef struct { 00079 UID uid; 00080 enum MXFMetadataSetType type; 00081 MXFSequence *sequence; /* mandatory, and only one */ 00082 UID sequence_ref; 00083 int track_id; 00084 uint8_t track_number[4]; 00085 AVRational edit_rate; 00086 } MXFTrack; 00087 00088 typedef struct { 00089 UID uid; 00090 enum MXFMetadataSetType type; 00091 UID essence_container_ul; 00092 UID essence_codec_ul; 00093 AVRational sample_rate; 00094 AVRational aspect_ratio; 00095 int width; 00096 int height; 00097 int channels; 00098 int bits_per_sample; 00099 UID *sub_descriptors_refs; 00100 int sub_descriptors_count; 00101 int linked_track_id; 00102 uint8_t *extradata; 00103 int extradata_size; 00104 } MXFDescriptor; 00105 00106 typedef struct { 00107 UID uid; 00108 enum MXFMetadataSetType type; 00109 } MXFIndexTableSegment; 00110 00111 typedef struct { 00112 UID uid; 00113 enum MXFMetadataSetType type; 00114 UID package_uid; 00115 UID *tracks_refs; 00116 int tracks_count; 00117 MXFDescriptor *descriptor; /* only one */ 00118 UID descriptor_ref; 00119 } MXFPackage; 00120 00121 typedef struct { 00122 UID uid; 00123 enum MXFMetadataSetType type; 00124 } MXFMetadataSet; 00125 00126 typedef struct { 00127 UID *packages_refs; 00128 int packages_count; 00129 MXFMetadataSet **metadata_sets; 00130 int metadata_sets_count; 00131 AVFormatContext *fc; 00132 struct AVAES *aesc; 00133 uint8_t *local_tags; 00134 int local_tags_count; 00135 } MXFContext; 00136 00137 enum MXFWrappingScheme { 00138 Frame, 00139 Clip, 00140 }; 00141 00142 typedef struct { 00143 const UID key; 00144 int (*read)(); 00145 int ctx_size; 00146 enum MXFMetadataSetType type; 00147 } MXFMetadataReadTableEntry; 00148 00149 /* partial keys to match */ 00150 static const uint8_t mxf_header_partition_pack_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 }; 00151 static const uint8_t mxf_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 }; 00152 static const uint8_t mxf_klv_key[] = { 0x06,0x0e,0x2b,0x34 }; 00153 /* complete keys to match */ 00154 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 }; 00155 static const uint8_t mxf_encrypted_triplet_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 }; 00156 static const uint8_t mxf_encrypted_essence_container[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 }; 00157 static const uint8_t mxf_sony_mpeg4_extradata[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 }; 00158 00159 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y))) 00160 00161 static int64_t klv_decode_ber_length(ByteIOContext *pb) 00162 { 00163 uint64_t size = get_byte(pb); 00164 if (size & 0x80) { /* long form */ 00165 int bytes_num = size & 0x7f; 00166 /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */ 00167 if (bytes_num > 8) 00168 return -1; 00169 size = 0; 00170 while (bytes_num--) 00171 size = size << 8 | get_byte(pb); 00172 } 00173 return size; 00174 } 00175 00176 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size) 00177 { 00178 int i, b; 00179 for (i = 0; i < size && !url_feof(pb); i++) { 00180 b = get_byte(pb); 00181 if (b == key[0]) 00182 i = 0; 00183 else if (b != key[i]) 00184 i = -1; 00185 } 00186 return i == size; 00187 } 00188 00189 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb) 00190 { 00191 if (!mxf_read_sync(pb, mxf_klv_key, 4)) 00192 return -1; 00193 klv->offset = url_ftell(pb) - 4; 00194 memcpy(klv->key, mxf_klv_key, 4); 00195 get_buffer(pb, klv->key + 4, 12); 00196 klv->length = klv_decode_ber_length(pb); 00197 return klv->length == -1 ? -1 : 0; 00198 } 00199 00200 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv) 00201 { 00202 int i; 00203 00204 for (i = 0; i < s->nb_streams; i++) { 00205 MXFTrack *track = s->streams[i]->priv_data; 00206 /* SMPTE 379M 7.3 */ 00207 if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number))) 00208 return i; 00209 } 00210 /* return 0 if only one stream, for OP Atom files with 0 as track number */ 00211 return s->nb_streams == 1 ? 0 : -1; 00212 } 00213 00214 /* XXX: use AVBitStreamFilter */ 00215 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length) 00216 { 00217 uint8_t buffer[61444]; 00218 const uint8_t *buf_ptr, *end_ptr; 00219 uint8_t *data_ptr; 00220 int i; 00221 00222 if (length > 61444) /* worst case PAL 1920 samples 8 channels */ 00223 return -1; 00224 get_buffer(pb, buffer, length); 00225 av_new_packet(pkt, length); 00226 data_ptr = pkt->data; 00227 end_ptr = buffer + length; 00228 buf_ptr = buffer + 4; /* skip SMPTE 331M header */ 00229 for (; buf_ptr < end_ptr; ) { 00230 for (i = 0; i < st->codec->channels; i++) { 00231 uint32_t sample = bytestream_get_le32(&buf_ptr); 00232 if (st->codec->bits_per_coded_sample == 24) 00233 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff); 00234 else 00235 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff); 00236 } 00237 buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M 00238 } 00239 pkt->size = data_ptr - pkt->data; 00240 return 0; 00241 } 00242 00243 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv) 00244 { 00245 static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b}; 00246 MXFContext *mxf = s->priv_data; 00247 ByteIOContext *pb = s->pb; 00248 int64_t end = url_ftell(pb) + klv->length; 00249 uint64_t size; 00250 uint64_t orig_size; 00251 uint64_t plaintext_size; 00252 uint8_t ivec[16]; 00253 uint8_t tmpbuf[16]; 00254 int index; 00255 00256 if (!mxf->aesc && s->key && s->keylen == 16) { 00257 mxf->aesc = av_malloc(av_aes_size); 00258 if (!mxf->aesc) 00259 return -1; 00260 av_aes_init(mxf->aesc, s->key, 128, 1); 00261 } 00262 // crypto context 00263 url_fskip(pb, klv_decode_ber_length(pb)); 00264 // plaintext offset 00265 klv_decode_ber_length(pb); 00266 plaintext_size = get_be64(pb); 00267 // source klv key 00268 klv_decode_ber_length(pb); 00269 get_buffer(pb, klv->key, 16); 00270 if (!IS_KLV_KEY(klv, mxf_essence_element_key)) 00271 return -1; 00272 index = mxf_get_stream_index(s, klv); 00273 if (index < 0) 00274 return -1; 00275 // source size 00276 klv_decode_ber_length(pb); 00277 orig_size = get_be64(pb); 00278 if (orig_size < plaintext_size) 00279 return -1; 00280 // enc. code 00281 size = klv_decode_ber_length(pb); 00282 if (size < 32 || size - 32 < orig_size) 00283 return -1; 00284 get_buffer(pb, ivec, 16); 00285 get_buffer(pb, tmpbuf, 16); 00286 if (mxf->aesc) 00287 av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1); 00288 if (memcmp(tmpbuf, checkv, 16)) 00289 av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n"); 00290 size -= 32; 00291 av_get_packet(pb, pkt, size); 00292 size -= plaintext_size; 00293 if (mxf->aesc) 00294 av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size], 00295 &pkt->data[plaintext_size], size >> 4, ivec, 1); 00296 pkt->size = orig_size; 00297 pkt->stream_index = index; 00298 url_fskip(pb, end - url_ftell(pb)); 00299 return 0; 00300 } 00301 00302 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt) 00303 { 00304 KLVPacket klv; 00305 00306 while (!url_feof(s->pb)) { 00307 if (klv_read_packet(&klv, s->pb) < 0) 00308 return -1; 00309 PRINT_KEY(s, "read packet", klv.key); 00310 dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset); 00311 if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) { 00312 int res = mxf_decrypt_triplet(s, pkt, &klv); 00313 if (res < 0) { 00314 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n"); 00315 return -1; 00316 } 00317 return 0; 00318 } 00319 if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) { 00320 int index = mxf_get_stream_index(s, &klv); 00321 if (index < 0) { 00322 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12)); 00323 goto skip; 00324 } 00325 if (s->streams[index]->discard == AVDISCARD_ALL) 00326 goto skip; 00327 /* check for 8 channels AES3 element */ 00328 if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) { 00329 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) { 00330 av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n"); 00331 return -1; 00332 } 00333 } else 00334 av_get_packet(s->pb, pkt, klv.length); 00335 pkt->stream_index = index; 00336 pkt->pos = klv.offset; 00337 return 0; 00338 } else 00339 skip: 00340 url_fskip(s->pb, klv.length); 00341 } 00342 return AVERROR(EIO); 00343 } 00344 00345 static int mxf_read_primer_pack(MXFContext *mxf) 00346 { 00347 ByteIOContext *pb = mxf->fc->pb; 00348 int item_num = get_be32(pb); 00349 int item_len = get_be32(pb); 00350 00351 if (item_len != 18) { 00352 av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n"); 00353 return -1; 00354 } 00355 if (item_num > UINT_MAX / item_len) 00356 return -1; 00357 mxf->local_tags_count = item_num; 00358 mxf->local_tags = av_malloc(item_num*item_len); 00359 if (!mxf->local_tags) 00360 return -1; 00361 get_buffer(pb, mxf->local_tags, item_num*item_len); 00362 return 0; 00363 } 00364 00365 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set) 00366 { 00367 mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets)); 00368 if (!mxf->metadata_sets) 00369 return -1; 00370 mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set; 00371 mxf->metadata_sets_count++; 00372 return 0; 00373 } 00374 00375 static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid) 00376 { 00377 if (size != 16) 00378 return -1; 00379 if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul)) 00380 get_buffer(pb, cryptocontext->source_container_ul, 16); 00381 return 0; 00382 } 00383 00384 static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag) 00385 { 00386 switch (tag) { 00387 case 0x1901: 00388 mxf->packages_count = get_be32(pb); 00389 if (mxf->packages_count >= UINT_MAX / sizeof(UID)) 00390 return -1; 00391 mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID)); 00392 if (!mxf->packages_refs) 00393 return -1; 00394 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00395 get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID)); 00396 break; 00397 } 00398 return 0; 00399 } 00400 00401 static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag) 00402 { 00403 switch(tag) { 00404 case 0x0202: 00405 source_clip->duration = get_be64(pb); 00406 break; 00407 case 0x1201: 00408 source_clip->start_position = get_be64(pb); 00409 break; 00410 case 0x1101: 00411 /* UMID, only get last 16 bytes */ 00412 url_fskip(pb, 16); 00413 get_buffer(pb, source_clip->source_package_uid, 16); 00414 break; 00415 case 0x1102: 00416 source_clip->source_track_id = get_be32(pb); 00417 break; 00418 } 00419 return 0; 00420 } 00421 00422 static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag) 00423 { 00424 switch(tag) { 00425 case 0x4403: 00426 package->tracks_count = get_be32(pb); 00427 if (package->tracks_count >= UINT_MAX / sizeof(UID)) 00428 return -1; 00429 package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID)); 00430 if (!package->tracks_refs) 00431 return -1; 00432 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00433 get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID)); 00434 break; 00435 } 00436 return 0; 00437 } 00438 00439 static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag) 00440 { 00441 switch(tag) { 00442 case 0x4801: 00443 track->track_id = get_be32(pb); 00444 break; 00445 case 0x4804: 00446 get_buffer(pb, track->track_number, 4); 00447 break; 00448 case 0x4B01: 00449 track->edit_rate.den = get_be32(pb); 00450 track->edit_rate.num = get_be32(pb); 00451 break; 00452 case 0x4803: 00453 get_buffer(pb, track->sequence_ref, 16); 00454 break; 00455 } 00456 return 0; 00457 } 00458 00459 static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag) 00460 { 00461 switch(tag) { 00462 case 0x0202: 00463 sequence->duration = get_be64(pb); 00464 break; 00465 case 0x0201: 00466 get_buffer(pb, sequence->data_definition_ul, 16); 00467 break; 00468 case 0x1001: 00469 sequence->structural_components_count = get_be32(pb); 00470 if (sequence->structural_components_count >= UINT_MAX / sizeof(UID)) 00471 return -1; 00472 sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID)); 00473 if (!sequence->structural_components_refs) 00474 return -1; 00475 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00476 get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID)); 00477 break; 00478 } 00479 return 0; 00480 } 00481 00482 static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag) 00483 { 00484 switch(tag) { 00485 case 0x4403: 00486 package->tracks_count = get_be32(pb); 00487 if (package->tracks_count >= UINT_MAX / sizeof(UID)) 00488 return -1; 00489 package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID)); 00490 if (!package->tracks_refs) 00491 return -1; 00492 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00493 get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID)); 00494 break; 00495 case 0x4401: 00496 /* UMID, only get last 16 bytes */ 00497 url_fskip(pb, 16); 00498 get_buffer(pb, package->package_uid, 16); 00499 break; 00500 case 0x4701: 00501 get_buffer(pb, package->descriptor_ref, 16); 00502 break; 00503 } 00504 return 0; 00505 } 00506 00507 static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag) 00508 { 00509 switch(tag) { 00510 case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break; 00511 case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break; 00512 case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break; 00513 case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break; 00514 case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break; 00515 case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break; 00516 } 00517 return 0; 00518 } 00519 00520 static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor) 00521 { 00522 int code; 00523 00524 do { 00525 code = get_byte(pb); 00526 dprintf(NULL, "pixel layout: code %#x\n", code); 00527 switch (code) { 00528 case 0x52: /* R */ 00529 descriptor->bits_per_sample += get_byte(pb); 00530 break; 00531 case 0x47: /* G */ 00532 descriptor->bits_per_sample += get_byte(pb); 00533 break; 00534 case 0x42: /* B */ 00535 descriptor->bits_per_sample += get_byte(pb); 00536 break; 00537 default: 00538 get_byte(pb); 00539 } 00540 } while (code != 0); /* SMPTE 377M E.2.46 */ 00541 } 00542 00543 static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid) 00544 { 00545 switch(tag) { 00546 case 0x3F01: 00547 descriptor->sub_descriptors_count = get_be32(pb); 00548 if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID)) 00549 return -1; 00550 descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID)); 00551 if (!descriptor->sub_descriptors_refs) 00552 return -1; 00553 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00554 get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID)); 00555 break; 00556 case 0x3004: 00557 get_buffer(pb, descriptor->essence_container_ul, 16); 00558 break; 00559 case 0x3006: 00560 descriptor->linked_track_id = get_be32(pb); 00561 break; 00562 case 0x3201: /* PictureEssenceCoding */ 00563 get_buffer(pb, descriptor->essence_codec_ul, 16); 00564 break; 00565 case 0x3203: 00566 descriptor->width = get_be32(pb); 00567 break; 00568 case 0x3202: 00569 descriptor->height = get_be32(pb); 00570 break; 00571 case 0x320E: 00572 descriptor->aspect_ratio.num = get_be32(pb); 00573 descriptor->aspect_ratio.den = get_be32(pb); 00574 break; 00575 case 0x3D03: 00576 descriptor->sample_rate.num = get_be32(pb); 00577 descriptor->sample_rate.den = get_be32(pb); 00578 break; 00579 case 0x3D06: /* SoundEssenceCompression */ 00580 get_buffer(pb, descriptor->essence_codec_ul, 16); 00581 break; 00582 case 0x3D07: 00583 descriptor->channels = get_be32(pb); 00584 break; 00585 case 0x3D01: 00586 descriptor->bits_per_sample = get_be32(pb); 00587 break; 00588 case 0x3401: 00589 mxf_read_pixel_layout(pb, descriptor); 00590 break; 00591 default: 00592 /* Private uid used by SONY C0023S01.mxf */ 00593 if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) { 00594 descriptor->extradata = av_malloc(size); 00595 if (!descriptor->extradata) 00596 return -1; 00597 descriptor->extradata_size = size; 00598 get_buffer(pb, descriptor->extradata, size); 00599 } 00600 break; 00601 } 00602 return 0; 00603 } 00604 00605 /* 00606 * Match an uid independently of the version byte and up to len common bytes 00607 * Returns: boolean 00608 */ 00609 static int mxf_match_uid(const UID key, const UID uid, int len) 00610 { 00611 int i; 00612 for (i = 0; i < len; i++) { 00613 if (i != 7 && key[i] != uid[i]) 00614 return 0; 00615 } 00616 return 1; 00617 } 00618 00619 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid) 00620 { 00621 while (uls->uid[0]) { 00622 if(mxf_match_uid(uls->uid, *uid, uls->matching_len)) 00623 break; 00624 uls++; 00625 } 00626 return uls; 00627 } 00628 00629 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type) 00630 { 00631 int i; 00632 00633 if (!strong_ref) 00634 return NULL; 00635 for (i = 0; i < mxf->metadata_sets_count; i++) { 00636 if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) && 00637 (type == AnyType || mxf->metadata_sets[i]->type == type)) { 00638 return mxf->metadata_sets[i]; 00639 } 00640 } 00641 return NULL; 00642 } 00643 00644 static const MXFCodecUL mxf_essence_container_uls[] = { 00645 // video essence container uls 00646 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */ 00647 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14, CODEC_ID_DVVIDEO }, /* DV 625 25mbps */ 00648 // sound essence container uls 00649 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */ 00650 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14, CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */ 00651 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */ 00652 { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, CODEC_ID_NONE }, 00653 }; 00654 00655 static int mxf_parse_structural_metadata(MXFContext *mxf) 00656 { 00657 MXFPackage *material_package = NULL; 00658 MXFPackage *temp_package = NULL; 00659 int i, j, k; 00660 00661 dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count); 00662 /* TODO: handle multiple material packages (OP3x) */ 00663 for (i = 0; i < mxf->packages_count; i++) { 00664 material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage); 00665 if (material_package) break; 00666 } 00667 if (!material_package) { 00668 av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n"); 00669 return -1; 00670 } 00671 00672 for (i = 0; i < material_package->tracks_count; i++) { 00673 MXFPackage *source_package = NULL; 00674 MXFTrack *material_track = NULL; 00675 MXFTrack *source_track = NULL; 00676 MXFTrack *temp_track = NULL; 00677 MXFDescriptor *descriptor = NULL; 00678 MXFStructuralComponent *component = NULL; 00679 UID *essence_container_ul = NULL; 00680 const MXFCodecUL *codec_ul = NULL; 00681 const MXFCodecUL *container_ul = NULL; 00682 AVStream *st; 00683 00684 if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) { 00685 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n"); 00686 continue; 00687 } 00688 00689 if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) { 00690 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n"); 00691 return -1; 00692 } 00693 00694 /* TODO: handle multiple source clips */ 00695 for (j = 0; j < material_track->sequence->structural_components_count; j++) { 00696 /* TODO: handle timecode component */ 00697 component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip); 00698 if (!component) 00699 continue; 00700 00701 for (k = 0; k < mxf->packages_count; k++) { 00702 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage); 00703 if (!temp_package) 00704 continue; 00705 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) { 00706 source_package = temp_package; 00707 break; 00708 } 00709 } 00710 if (!source_package) { 00711 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id); 00712 break; 00713 } 00714 for (k = 0; k < source_package->tracks_count; k++) { 00715 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) { 00716 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n"); 00717 return -1; 00718 } 00719 if (temp_track->track_id == component->source_track_id) { 00720 source_track = temp_track; 00721 break; 00722 } 00723 } 00724 if (!source_track) { 00725 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id); 00726 break; 00727 } 00728 } 00729 if (!source_track) 00730 continue; 00731 00732 st = av_new_stream(mxf->fc, source_track->track_id); 00733 if (!st) { 00734 av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n"); 00735 return -1; 00736 } 00737 st->priv_data = source_track; 00738 st->duration = component->duration; 00739 if (st->duration == -1) 00740 st->duration = AV_NOPTS_VALUE; 00741 st->start_time = component->start_position; 00742 av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den); 00743 00744 if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) { 00745 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n"); 00746 return -1; 00747 } 00748 00749 PRINT_KEY(mxf->fc, "data definition ul", source_track->sequence->data_definition_ul); 00750 codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul); 00751 st->codec->codec_type = codec_ul->id; 00752 00753 source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType); 00754 if (source_package->descriptor) { 00755 if (source_package->descriptor->type == MultipleDescriptor) { 00756 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) { 00757 MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor); 00758 00759 if (!sub_descriptor) { 00760 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n"); 00761 continue; 00762 } 00763 if (sub_descriptor->linked_track_id == source_track->track_id) { 00764 descriptor = sub_descriptor; 00765 break; 00766 } 00767 } 00768 } else if (source_package->descriptor->type == Descriptor) 00769 descriptor = source_package->descriptor; 00770 } 00771 if (!descriptor) { 00772 av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index); 00773 continue; 00774 } 00775 PRINT_KEY(mxf->fc, "essence codec ul", descriptor->essence_codec_ul); 00776 PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul); 00777 essence_container_ul = &descriptor->essence_container_ul; 00778 /* HACK: replacing the original key with mxf_encrypted_essence_container 00779 * is not allowed according to s429-6, try to find correct information anyway */ 00780 if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) { 00781 av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n"); 00782 for (k = 0; k < mxf->metadata_sets_count; k++) { 00783 MXFMetadataSet *metadata = mxf->metadata_sets[k]; 00784 if (metadata->type == CryptoContext) { 00785 essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul; 00786 break; 00787 } 00788 } 00789 } 00790 /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */ 00791 codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul); 00792 st->codec->codec_id = codec_ul->id; 00793 if (descriptor->extradata) { 00794 st->codec->extradata = descriptor->extradata; 00795 st->codec->extradata_size = descriptor->extradata_size; 00796 } 00797 if (st->codec->codec_type == CODEC_TYPE_VIDEO) { 00798 container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul); 00799 if (st->codec->codec_id == CODEC_ID_NONE) 00800 st->codec->codec_id = container_ul->id; 00801 st->codec->width = descriptor->width; 00802 st->codec->height = descriptor->height; 00803 st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */ 00804 st->need_parsing = AVSTREAM_PARSE_HEADERS; 00805 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) { 00806 container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul); 00807 if (st->codec->codec_id == CODEC_ID_NONE) 00808 st->codec->codec_id = container_ul->id; 00809 st->codec->channels = descriptor->channels; 00810 st->codec->bits_per_coded_sample = descriptor->bits_per_sample; 00811 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den; 00812 /* TODO: implement CODEC_ID_RAWAUDIO */ 00813 if (st->codec->codec_id == CODEC_ID_PCM_S16LE) { 00814 if (descriptor->bits_per_sample == 24) 00815 st->codec->codec_id = CODEC_ID_PCM_S24LE; 00816 else if (descriptor->bits_per_sample == 32) 00817 st->codec->codec_id = CODEC_ID_PCM_S32LE; 00818 } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) { 00819 if (descriptor->bits_per_sample == 24) 00820 st->codec->codec_id = CODEC_ID_PCM_S24BE; 00821 else if (descriptor->bits_per_sample == 32) 00822 st->codec->codec_id = CODEC_ID_PCM_S32BE; 00823 } else if (st->codec->codec_id == CODEC_ID_MP2) { 00824 st->need_parsing = AVSTREAM_PARSE_FULL; 00825 } 00826 } 00827 if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) { 00828 av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n"); 00829 st->need_parsing = AVSTREAM_PARSE_FULL; 00830 } 00831 } 00832 return 0; 00833 } 00834 00835 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = { 00836 { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack }, 00837 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType }, 00838 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage }, 00839 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage }, 00840 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence }, 00841 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip }, 00842 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor }, 00843 { { 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 */ 00844 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */ 00845 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */ 00846 { { 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 */ 00847 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */ 00848 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */ 00849 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */ 00850 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */ 00851 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext }, 00852 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment }, 00853 { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType }, 00854 }; 00855 00856 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type) 00857 { 00858 ByteIOContext *pb = mxf->fc->pb; 00859 MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf; 00860 uint64_t klv_end = url_ftell(pb) + klv->length; 00861 00862 if (!ctx) 00863 return -1; 00864 while (url_ftell(pb) + 4 < klv_end) { 00865 int tag = get_be16(pb); 00866 int size = get_be16(pb); /* KLV specified by 0x53 */ 00867 uint64_t next = url_ftell(pb) + size; 00868 UID uid = {0}; 00869 00870 dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size); 00871 if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */ 00872 av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag); 00873 continue; 00874 } 00875 if (tag > 0x7FFF) { /* dynamic tag */ 00876 int i; 00877 for (i = 0; i < mxf->local_tags_count; i++) { 00878 int local_tag = AV_RB16(mxf->local_tags+i*18); 00879 if (local_tag == tag) { 00880 memcpy(uid, mxf->local_tags+i*18+2, 16); 00881 dprintf(mxf->fc, "local tag %#04x\n", local_tag); 00882 PRINT_KEY(mxf->fc, "uid", uid); 00883 } 00884 } 00885 } 00886 if (ctx_size && tag == 0x3C0A) 00887 get_buffer(pb, ctx->uid, 16); 00888 else if (read_child(ctx, pb, tag, size, uid) < 0) 00889 return -1; 00890 00891 url_fseek(pb, next, SEEK_SET); 00892 } 00893 if (ctx_size) ctx->type = type; 00894 return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0; 00895 } 00896 00897 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap) 00898 { 00899 MXFContext *mxf = s->priv_data; 00900 KLVPacket klv; 00901 00902 if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) { 00903 av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n"); 00904 return -1; 00905 } 00906 url_fseek(s->pb, -14, SEEK_CUR); 00907 mxf->fc = s; 00908 while (!url_feof(s->pb)) { 00909 const MXFMetadataReadTableEntry *metadata; 00910 00911 if (klv_read_packet(&klv, s->pb) < 0) 00912 return -1; 00913 PRINT_KEY(s, "read header", klv.key); 00914 dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset); 00915 if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) || 00916 IS_KLV_KEY(klv.key, mxf_essence_element_key)) { 00917 /* FIXME avoid seek */ 00918 url_fseek(s->pb, klv.offset, SEEK_SET); 00919 break; 00920 } 00921 00922 for (metadata = mxf_metadata_read_table; metadata->read; metadata++) { 00923 if (IS_KLV_KEY(klv.key, metadata->key)) { 00924 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read; 00925 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) { 00926 av_log(s, AV_LOG_ERROR, "error reading header metadata\n"); 00927 return -1; 00928 } 00929 break; 00930 } 00931 } 00932 if (!metadata->read) 00933 url_fskip(s->pb, klv.length); 00934 } 00935 return mxf_parse_structural_metadata(mxf); 00936 } 00937 00938 static int mxf_read_close(AVFormatContext *s) 00939 { 00940 MXFContext *mxf = s->priv_data; 00941 int i; 00942 00943 av_freep(&mxf->packages_refs); 00944 for (i = 0; i < mxf->metadata_sets_count; i++) { 00945 switch (mxf->metadata_sets[i]->type) { 00946 case MultipleDescriptor: 00947 av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs); 00948 break; 00949 case Sequence: 00950 av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs); 00951 break; 00952 case SourcePackage: 00953 case MaterialPackage: 00954 av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs); 00955 break; 00956 case Track: 00957 mxf->metadata_sets[i] = NULL; /* will be freed later */ 00958 break; 00959 default: 00960 break; 00961 } 00962 av_freep(&mxf->metadata_sets[i]); 00963 } 00964 av_freep(&mxf->metadata_sets); 00965 av_freep(&mxf->aesc); 00966 av_freep(&mxf->local_tags); 00967 return 0; 00968 } 00969 00970 static int mxf_probe(AVProbeData *p) { 00971 uint8_t *bufp = p->buf; 00972 uint8_t *end = p->buf + p->buf_size; 00973 00974 if (p->buf_size < sizeof(mxf_header_partition_pack_key)) 00975 return 0; 00976 00977 /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */ 00978 end -= sizeof(mxf_header_partition_pack_key); 00979 for (; bufp < end; bufp++) { 00980 if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key)) 00981 return AVPROBE_SCORE_MAX; 00982 } 00983 return 0; 00984 } 00985 00986 /* rudimentary byte seek */ 00987 /* XXX: use MXF Index */ 00988 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags) 00989 { 00990 AVStream *st = s->streams[stream_index]; 00991 int64_t seconds; 00992 00993 if (!s->bit_rate) 00994 return -1; 00995 if (sample_time < 0) 00996 sample_time = 0; 00997 seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den); 00998 url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET); 00999 av_update_cur_dts(s, st, sample_time); 01000 return 0; 01001 } 01002 01003 AVInputFormat mxf_demuxer = { 01004 "mxf", 01005 NULL_IF_CONFIG_SMALL("Material eXchange Format"), 01006 sizeof(MXFContext), 01007 mxf_probe, 01008 mxf_read_header, 01009 mxf_read_packet, 01010 mxf_read_close, 01011 mxf_read_seek, 01012 };