Libav
|
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 const uint8_t *buf_ptr, *end_ptr; 00218 uint8_t *data_ptr; 00219 int i; 00220 00221 if (length > 61444) /* worst case PAL 1920 samples 8 channels */ 00222 return -1; 00223 av_new_packet(pkt, length); 00224 get_buffer(pb, pkt->data, length); 00225 data_ptr = pkt->data; 00226 end_ptr = pkt->data + length; 00227 buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */ 00228 for (; buf_ptr < end_ptr; ) { 00229 for (i = 0; i < st->codec->channels; i++) { 00230 uint32_t sample = bytestream_get_le32(&buf_ptr); 00231 if (st->codec->bits_per_coded_sample == 24) 00232 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff); 00233 else 00234 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff); 00235 } 00236 buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M 00237 } 00238 pkt->size = data_ptr - pkt->data; 00239 return 0; 00240 } 00241 00242 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv) 00243 { 00244 static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b}; 00245 MXFContext *mxf = s->priv_data; 00246 ByteIOContext *pb = s->pb; 00247 int64_t end = url_ftell(pb) + klv->length; 00248 uint64_t size; 00249 uint64_t orig_size; 00250 uint64_t plaintext_size; 00251 uint8_t ivec[16]; 00252 uint8_t tmpbuf[16]; 00253 int index; 00254 00255 if (!mxf->aesc && s->key && s->keylen == 16) { 00256 mxf->aesc = av_malloc(av_aes_size); 00257 if (!mxf->aesc) 00258 return -1; 00259 av_aes_init(mxf->aesc, s->key, 128, 1); 00260 } 00261 // crypto context 00262 url_fskip(pb, klv_decode_ber_length(pb)); 00263 // plaintext offset 00264 klv_decode_ber_length(pb); 00265 plaintext_size = get_be64(pb); 00266 // source klv key 00267 klv_decode_ber_length(pb); 00268 get_buffer(pb, klv->key, 16); 00269 if (!IS_KLV_KEY(klv, mxf_essence_element_key)) 00270 return -1; 00271 index = mxf_get_stream_index(s, klv); 00272 if (index < 0) 00273 return -1; 00274 // source size 00275 klv_decode_ber_length(pb); 00276 orig_size = get_be64(pb); 00277 if (orig_size < plaintext_size) 00278 return -1; 00279 // enc. code 00280 size = klv_decode_ber_length(pb); 00281 if (size < 32 || size - 32 < orig_size) 00282 return -1; 00283 get_buffer(pb, ivec, 16); 00284 get_buffer(pb, tmpbuf, 16); 00285 if (mxf->aesc) 00286 av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1); 00287 if (memcmp(tmpbuf, checkv, 16)) 00288 av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n"); 00289 size -= 32; 00290 av_get_packet(pb, pkt, size); 00291 size -= plaintext_size; 00292 if (mxf->aesc) 00293 av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size], 00294 &pkt->data[plaintext_size], size >> 4, ivec, 1); 00295 pkt->size = orig_size; 00296 pkt->stream_index = index; 00297 url_fskip(pb, end - url_ftell(pb)); 00298 return 0; 00299 } 00300 00301 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt) 00302 { 00303 KLVPacket klv; 00304 00305 while (!url_feof(s->pb)) { 00306 if (klv_read_packet(&klv, s->pb) < 0) 00307 return -1; 00308 PRINT_KEY(s, "read packet", klv.key); 00309 dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset); 00310 if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) { 00311 int res = mxf_decrypt_triplet(s, pkt, &klv); 00312 if (res < 0) { 00313 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n"); 00314 return -1; 00315 } 00316 return 0; 00317 } 00318 if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) { 00319 int index = mxf_get_stream_index(s, &klv); 00320 if (index < 0) { 00321 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12)); 00322 goto skip; 00323 } 00324 if (s->streams[index]->discard == AVDISCARD_ALL) 00325 goto skip; 00326 /* check for 8 channels AES3 element */ 00327 if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) { 00328 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) { 00329 av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n"); 00330 return -1; 00331 } 00332 } else 00333 av_get_packet(s->pb, pkt, klv.length); 00334 pkt->stream_index = index; 00335 pkt->pos = klv.offset; 00336 return 0; 00337 } else 00338 skip: 00339 url_fskip(s->pb, klv.length); 00340 } 00341 return AVERROR_EOF; 00342 } 00343 00344 static int mxf_read_primer_pack(MXFContext *mxf) 00345 { 00346 ByteIOContext *pb = mxf->fc->pb; 00347 int item_num = get_be32(pb); 00348 int item_len = get_be32(pb); 00349 00350 if (item_len != 18) { 00351 av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n"); 00352 return -1; 00353 } 00354 if (item_num > UINT_MAX / item_len) 00355 return -1; 00356 mxf->local_tags_count = item_num; 00357 mxf->local_tags = av_malloc(item_num*item_len); 00358 if (!mxf->local_tags) 00359 return -1; 00360 get_buffer(pb, mxf->local_tags, item_num*item_len); 00361 return 0; 00362 } 00363 00364 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set) 00365 { 00366 if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets)) 00367 return AVERROR(ENOMEM); 00368 mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets)); 00369 if (!mxf->metadata_sets) 00370 return -1; 00371 mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set; 00372 mxf->metadata_sets_count++; 00373 return 0; 00374 } 00375 00376 static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid) 00377 { 00378 if (size != 16) 00379 return -1; 00380 if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul)) 00381 get_buffer(pb, cryptocontext->source_container_ul, 16); 00382 return 0; 00383 } 00384 00385 static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag) 00386 { 00387 switch (tag) { 00388 case 0x1901: 00389 mxf->packages_count = get_be32(pb); 00390 if (mxf->packages_count >= UINT_MAX / sizeof(UID)) 00391 return -1; 00392 mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID)); 00393 if (!mxf->packages_refs) 00394 return -1; 00395 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00396 get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID)); 00397 break; 00398 } 00399 return 0; 00400 } 00401 00402 static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag) 00403 { 00404 switch(tag) { 00405 case 0x0202: 00406 source_clip->duration = get_be64(pb); 00407 break; 00408 case 0x1201: 00409 source_clip->start_position = get_be64(pb); 00410 break; 00411 case 0x1101: 00412 /* UMID, only get last 16 bytes */ 00413 url_fskip(pb, 16); 00414 get_buffer(pb, source_clip->source_package_uid, 16); 00415 break; 00416 case 0x1102: 00417 source_clip->source_track_id = get_be32(pb); 00418 break; 00419 } 00420 return 0; 00421 } 00422 00423 static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag) 00424 { 00425 switch(tag) { 00426 case 0x4403: 00427 package->tracks_count = get_be32(pb); 00428 if (package->tracks_count >= UINT_MAX / sizeof(UID)) 00429 return -1; 00430 package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID)); 00431 if (!package->tracks_refs) 00432 return -1; 00433 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00434 get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID)); 00435 break; 00436 } 00437 return 0; 00438 } 00439 00440 static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag) 00441 { 00442 switch(tag) { 00443 case 0x4801: 00444 track->track_id = get_be32(pb); 00445 break; 00446 case 0x4804: 00447 get_buffer(pb, track->track_number, 4); 00448 break; 00449 case 0x4B01: 00450 track->edit_rate.den = get_be32(pb); 00451 track->edit_rate.num = get_be32(pb); 00452 break; 00453 case 0x4803: 00454 get_buffer(pb, track->sequence_ref, 16); 00455 break; 00456 } 00457 return 0; 00458 } 00459 00460 static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag) 00461 { 00462 switch(tag) { 00463 case 0x0202: 00464 sequence->duration = get_be64(pb); 00465 break; 00466 case 0x0201: 00467 get_buffer(pb, sequence->data_definition_ul, 16); 00468 break; 00469 case 0x1001: 00470 sequence->structural_components_count = get_be32(pb); 00471 if (sequence->structural_components_count >= UINT_MAX / sizeof(UID)) 00472 return -1; 00473 sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID)); 00474 if (!sequence->structural_components_refs) 00475 return -1; 00476 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00477 get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID)); 00478 break; 00479 } 00480 return 0; 00481 } 00482 00483 static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag) 00484 { 00485 switch(tag) { 00486 case 0x4403: 00487 package->tracks_count = get_be32(pb); 00488 if (package->tracks_count >= UINT_MAX / sizeof(UID)) 00489 return -1; 00490 package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID)); 00491 if (!package->tracks_refs) 00492 return -1; 00493 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00494 get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID)); 00495 break; 00496 case 0x4401: 00497 /* UMID, only get last 16 bytes */ 00498 url_fskip(pb, 16); 00499 get_buffer(pb, package->package_uid, 16); 00500 break; 00501 case 0x4701: 00502 get_buffer(pb, package->descriptor_ref, 16); 00503 break; 00504 } 00505 return 0; 00506 } 00507 00508 static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag) 00509 { 00510 switch(tag) { 00511 case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break; 00512 case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break; 00513 case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break; 00514 case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break; 00515 case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break; 00516 case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break; 00517 } 00518 return 0; 00519 } 00520 00521 static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor) 00522 { 00523 int code; 00524 00525 do { 00526 code = get_byte(pb); 00527 dprintf(NULL, "pixel layout: code %#x\n", code); 00528 switch (code) { 00529 case 0x52: /* R */ 00530 descriptor->bits_per_sample += get_byte(pb); 00531 break; 00532 case 0x47: /* G */ 00533 descriptor->bits_per_sample += get_byte(pb); 00534 break; 00535 case 0x42: /* B */ 00536 descriptor->bits_per_sample += get_byte(pb); 00537 break; 00538 default: 00539 get_byte(pb); 00540 } 00541 } while (code != 0); /* SMPTE 377M E.2.46 */ 00542 } 00543 00544 static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid) 00545 { 00546 switch(tag) { 00547 case 0x3F01: 00548 descriptor->sub_descriptors_count = get_be32(pb); 00549 if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID)) 00550 return -1; 00551 descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID)); 00552 if (!descriptor->sub_descriptors_refs) 00553 return -1; 00554 url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */ 00555 get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID)); 00556 break; 00557 case 0x3004: 00558 get_buffer(pb, descriptor->essence_container_ul, 16); 00559 break; 00560 case 0x3006: 00561 descriptor->linked_track_id = get_be32(pb); 00562 break; 00563 case 0x3201: /* PictureEssenceCoding */ 00564 get_buffer(pb, descriptor->essence_codec_ul, 16); 00565 break; 00566 case 0x3203: 00567 descriptor->width = get_be32(pb); 00568 break; 00569 case 0x3202: 00570 descriptor->height = get_be32(pb); 00571 break; 00572 case 0x320E: 00573 descriptor->aspect_ratio.num = get_be32(pb); 00574 descriptor->aspect_ratio.den = get_be32(pb); 00575 break; 00576 case 0x3D03: 00577 descriptor->sample_rate.num = get_be32(pb); 00578 descriptor->sample_rate.den = get_be32(pb); 00579 break; 00580 case 0x3D06: /* SoundEssenceCompression */ 00581 get_buffer(pb, descriptor->essence_codec_ul, 16); 00582 break; 00583 case 0x3D07: 00584 descriptor->channels = get_be32(pb); 00585 break; 00586 case 0x3D01: 00587 descriptor->bits_per_sample = get_be32(pb); 00588 break; 00589 case 0x3401: 00590 mxf_read_pixel_layout(pb, descriptor); 00591 break; 00592 default: 00593 /* Private uid used by SONY C0023S01.mxf */ 00594 if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) { 00595 descriptor->extradata = av_malloc(size); 00596 if (!descriptor->extradata) 00597 return -1; 00598 descriptor->extradata_size = size; 00599 get_buffer(pb, descriptor->extradata, size); 00600 } 00601 break; 00602 } 00603 return 0; 00604 } 00605 00606 /* 00607 * Match an uid independently of the version byte and up to len common bytes 00608 * Returns: boolean 00609 */ 00610 static int mxf_match_uid(const UID key, const UID uid, int len) 00611 { 00612 int i; 00613 for (i = 0; i < len; i++) { 00614 if (i != 7 && key[i] != uid[i]) 00615 return 0; 00616 } 00617 return 1; 00618 } 00619 00620 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid) 00621 { 00622 while (uls->uid[0]) { 00623 if(mxf_match_uid(uls->uid, *uid, uls->matching_len)) 00624 break; 00625 uls++; 00626 } 00627 return uls; 00628 } 00629 00630 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type) 00631 { 00632 int i; 00633 00634 if (!strong_ref) 00635 return NULL; 00636 for (i = 0; i < mxf->metadata_sets_count; i++) { 00637 if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) && 00638 (type == AnyType || mxf->metadata_sets[i]->type == type)) { 00639 return mxf->metadata_sets[i]; 00640 } 00641 } 00642 return NULL; 00643 } 00644 00645 static const MXFCodecUL mxf_essence_container_uls[] = { 00646 // video essence container uls 00647 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */ 00648 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14, CODEC_ID_DVVIDEO }, /* DV 625 25mbps */ 00649 // sound essence container uls 00650 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */ 00651 { { 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 */ 00652 { { 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 */ 00653 { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, CODEC_ID_NONE }, 00654 }; 00655 00656 static int mxf_parse_structural_metadata(MXFContext *mxf) 00657 { 00658 MXFPackage *material_package = NULL; 00659 MXFPackage *temp_package = NULL; 00660 int i, j, k; 00661 00662 dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count); 00663 /* TODO: handle multiple material packages (OP3x) */ 00664 for (i = 0; i < mxf->packages_count; i++) { 00665 material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage); 00666 if (material_package) break; 00667 } 00668 if (!material_package) { 00669 av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n"); 00670 return -1; 00671 } 00672 00673 for (i = 0; i < material_package->tracks_count; i++) { 00674 MXFPackage *source_package = NULL; 00675 MXFTrack *material_track = NULL; 00676 MXFTrack *source_track = NULL; 00677 MXFTrack *temp_track = NULL; 00678 MXFDescriptor *descriptor = NULL; 00679 MXFStructuralComponent *component = NULL; 00680 UID *essence_container_ul = NULL; 00681 const MXFCodecUL *codec_ul = NULL; 00682 const MXFCodecUL *container_ul = NULL; 00683 AVStream *st; 00684 00685 if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) { 00686 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n"); 00687 continue; 00688 } 00689 00690 if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) { 00691 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n"); 00692 continue; 00693 } 00694 00695 /* TODO: handle multiple source clips */ 00696 for (j = 0; j < material_track->sequence->structural_components_count; j++) { 00697 /* TODO: handle timecode component */ 00698 component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip); 00699 if (!component) 00700 continue; 00701 00702 for (k = 0; k < mxf->packages_count; k++) { 00703 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage); 00704 if (!temp_package) 00705 continue; 00706 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) { 00707 source_package = temp_package; 00708 break; 00709 } 00710 } 00711 if (!source_package) { 00712 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id); 00713 break; 00714 } 00715 for (k = 0; k < source_package->tracks_count; k++) { 00716 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) { 00717 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n"); 00718 return -1; 00719 } 00720 if (temp_track->track_id == component->source_track_id) { 00721 source_track = temp_track; 00722 break; 00723 } 00724 } 00725 if (!source_track) { 00726 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id); 00727 break; 00728 } 00729 } 00730 if (!source_track) 00731 continue; 00732 00733 st = av_new_stream(mxf->fc, source_track->track_id); 00734 if (!st) { 00735 av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n"); 00736 return -1; 00737 } 00738 st->priv_data = source_track; 00739 st->duration = component->duration; 00740 if (st->duration == -1) 00741 st->duration = AV_NOPTS_VALUE; 00742 st->start_time = component->start_position; 00743 av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den); 00744 00745 if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) { 00746 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n"); 00747 return -1; 00748 } 00749 00750 PRINT_KEY(mxf->fc, "data definition ul", source_track->sequence->data_definition_ul); 00751 codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul); 00752 st->codec->codec_type = codec_ul->id; 00753 00754 source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType); 00755 if (source_package->descriptor) { 00756 if (source_package->descriptor->type == MultipleDescriptor) { 00757 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) { 00758 MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor); 00759 00760 if (!sub_descriptor) { 00761 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n"); 00762 continue; 00763 } 00764 if (sub_descriptor->linked_track_id == source_track->track_id) { 00765 descriptor = sub_descriptor; 00766 break; 00767 } 00768 } 00769 } else if (source_package->descriptor->type == Descriptor) 00770 descriptor = source_package->descriptor; 00771 } 00772 if (!descriptor) { 00773 av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index); 00774 continue; 00775 } 00776 PRINT_KEY(mxf->fc, "essence codec ul", descriptor->essence_codec_ul); 00777 PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul); 00778 essence_container_ul = &descriptor->essence_container_ul; 00779 /* HACK: replacing the original key with mxf_encrypted_essence_container 00780 * is not allowed according to s429-6, try to find correct information anyway */ 00781 if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) { 00782 av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n"); 00783 for (k = 0; k < mxf->metadata_sets_count; k++) { 00784 MXFMetadataSet *metadata = mxf->metadata_sets[k]; 00785 if (metadata->type == CryptoContext) { 00786 essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul; 00787 break; 00788 } 00789 } 00790 } 00791 /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */ 00792 codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul); 00793 st->codec->codec_id = codec_ul->id; 00794 if (descriptor->extradata) { 00795 st->codec->extradata = descriptor->extradata; 00796 st->codec->extradata_size = descriptor->extradata_size; 00797 } 00798 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 00799 container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul); 00800 if (st->codec->codec_id == CODEC_ID_NONE) 00801 st->codec->codec_id = container_ul->id; 00802 st->codec->width = descriptor->width; 00803 st->codec->height = descriptor->height; 00804 st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */ 00805 st->need_parsing = AVSTREAM_PARSE_HEADERS; 00806 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { 00807 container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul); 00808 if (st->codec->codec_id == CODEC_ID_NONE) 00809 st->codec->codec_id = container_ul->id; 00810 st->codec->channels = descriptor->channels; 00811 st->codec->bits_per_coded_sample = descriptor->bits_per_sample; 00812 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den; 00813 /* TODO: implement CODEC_ID_RAWAUDIO */ 00814 if (st->codec->codec_id == CODEC_ID_PCM_S16LE) { 00815 if (descriptor->bits_per_sample == 24) 00816 st->codec->codec_id = CODEC_ID_PCM_S24LE; 00817 else if (descriptor->bits_per_sample == 32) 00818 st->codec->codec_id = CODEC_ID_PCM_S32LE; 00819 } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) { 00820 if (descriptor->bits_per_sample == 24) 00821 st->codec->codec_id = CODEC_ID_PCM_S24BE; 00822 else if (descriptor->bits_per_sample == 32) 00823 st->codec->codec_id = CODEC_ID_PCM_S32BE; 00824 } else if (st->codec->codec_id == CODEC_ID_MP2) { 00825 st->need_parsing = AVSTREAM_PARSE_FULL; 00826 } 00827 } 00828 if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) { 00829 av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n"); 00830 st->need_parsing = AVSTREAM_PARSE_FULL; 00831 } 00832 } 00833 return 0; 00834 } 00835 00836 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = { 00837 { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack }, 00838 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType }, 00839 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage }, 00840 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage }, 00841 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence }, 00842 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip }, 00843 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor }, 00844 { { 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 */ 00845 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */ 00846 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */ 00847 { { 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 */ 00848 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */ 00849 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */ 00850 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */ 00851 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */ 00852 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext }, 00853 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment }, 00854 { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType }, 00855 }; 00856 00857 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type) 00858 { 00859 ByteIOContext *pb = mxf->fc->pb; 00860 MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf; 00861 uint64_t klv_end = url_ftell(pb) + klv->length; 00862 00863 if (!ctx) 00864 return -1; 00865 while (url_ftell(pb) + 4 < klv_end) { 00866 int tag = get_be16(pb); 00867 int size = get_be16(pb); /* KLV specified by 0x53 */ 00868 uint64_t next = url_ftell(pb) + size; 00869 UID uid = {0}; 00870 00871 dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size); 00872 if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */ 00873 av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag); 00874 continue; 00875 } 00876 if (tag > 0x7FFF) { /* dynamic tag */ 00877 int i; 00878 for (i = 0; i < mxf->local_tags_count; i++) { 00879 int local_tag = AV_RB16(mxf->local_tags+i*18); 00880 if (local_tag == tag) { 00881 memcpy(uid, mxf->local_tags+i*18+2, 16); 00882 dprintf(mxf->fc, "local tag %#04x\n", local_tag); 00883 PRINT_KEY(mxf->fc, "uid", uid); 00884 } 00885 } 00886 } 00887 if (ctx_size && tag == 0x3C0A) 00888 get_buffer(pb, ctx->uid, 16); 00889 else if (read_child(ctx, pb, tag, size, uid) < 0) 00890 return -1; 00891 00892 url_fseek(pb, next, SEEK_SET); 00893 } 00894 if (ctx_size) ctx->type = type; 00895 return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0; 00896 } 00897 00898 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap) 00899 { 00900 MXFContext *mxf = s->priv_data; 00901 KLVPacket klv; 00902 00903 if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) { 00904 av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n"); 00905 return -1; 00906 } 00907 url_fseek(s->pb, -14, SEEK_CUR); 00908 mxf->fc = s; 00909 while (!url_feof(s->pb)) { 00910 const MXFMetadataReadTableEntry *metadata; 00911 00912 if (klv_read_packet(&klv, s->pb) < 0) 00913 return -1; 00914 PRINT_KEY(s, "read header", klv.key); 00915 dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset); 00916 if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) || 00917 IS_KLV_KEY(klv.key, mxf_essence_element_key)) { 00918 /* FIXME avoid seek */ 00919 url_fseek(s->pb, klv.offset, SEEK_SET); 00920 break; 00921 } 00922 00923 for (metadata = mxf_metadata_read_table; metadata->read; metadata++) { 00924 if (IS_KLV_KEY(klv.key, metadata->key)) { 00925 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read; 00926 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) { 00927 av_log(s, AV_LOG_ERROR, "error reading header metadata\n"); 00928 return -1; 00929 } 00930 break; 00931 } 00932 } 00933 if (!metadata->read) 00934 url_fskip(s->pb, klv.length); 00935 } 00936 return mxf_parse_structural_metadata(mxf); 00937 } 00938 00939 static int mxf_read_close(AVFormatContext *s) 00940 { 00941 MXFContext *mxf = s->priv_data; 00942 int i; 00943 00944 av_freep(&mxf->packages_refs); 00945 00946 for (i = 0; i < s->nb_streams; i++) 00947 s->streams[i]->priv_data = NULL; 00948 00949 for (i = 0; i < mxf->metadata_sets_count; i++) { 00950 switch (mxf->metadata_sets[i]->type) { 00951 case MultipleDescriptor: 00952 av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs); 00953 break; 00954 case Sequence: 00955 av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs); 00956 break; 00957 case SourcePackage: 00958 case MaterialPackage: 00959 av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs); 00960 break; 00961 default: 00962 break; 00963 } 00964 av_freep(&mxf->metadata_sets[i]); 00965 } 00966 av_freep(&mxf->metadata_sets); 00967 av_freep(&mxf->aesc); 00968 av_freep(&mxf->local_tags); 00969 return 0; 00970 } 00971 00972 static int mxf_probe(AVProbeData *p) { 00973 uint8_t *bufp = p->buf; 00974 uint8_t *end = p->buf + p->buf_size; 00975 00976 if (p->buf_size < sizeof(mxf_header_partition_pack_key)) 00977 return 0; 00978 00979 /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */ 00980 end -= sizeof(mxf_header_partition_pack_key); 00981 for (; bufp < end; bufp++) { 00982 if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key)) 00983 return AVPROBE_SCORE_MAX; 00984 } 00985 return 0; 00986 } 00987 00988 /* rudimentary byte seek */ 00989 /* XXX: use MXF Index */ 00990 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags) 00991 { 00992 AVStream *st = s->streams[stream_index]; 00993 int64_t seconds; 00994 00995 if (!s->bit_rate) 00996 return -1; 00997 if (sample_time < 0) 00998 sample_time = 0; 00999 seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den); 01000 url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET); 01001 av_update_cur_dts(s, st, sample_time); 01002 return 0; 01003 } 01004 01005 AVInputFormat mxf_demuxer = { 01006 "mxf", 01007 NULL_IF_CONFIG_SMALL("Material eXchange Format"), 01008 sizeof(MXFContext), 01009 mxf_probe, 01010 mxf_read_header, 01011 mxf_read_packet, 01012 mxf_read_close, 01013 mxf_read_seek, 01014 };