Libav 0.7.1
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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 Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 enum PixelFormat pix_fmt; 00105 } MXFDescriptor; 00106 00107 typedef struct { 00108 UID uid; 00109 enum MXFMetadataSetType type; 00110 } MXFIndexTableSegment; 00111 00112 typedef struct { 00113 UID uid; 00114 enum MXFMetadataSetType type; 00115 UID package_uid; 00116 UID *tracks_refs; 00117 int tracks_count; 00118 MXFDescriptor *descriptor; /* only one */ 00119 UID descriptor_ref; 00120 } MXFPackage; 00121 00122 typedef struct { 00123 UID uid; 00124 enum MXFMetadataSetType type; 00125 } MXFMetadataSet; 00126 00127 typedef struct { 00128 UID *packages_refs; 00129 int packages_count; 00130 MXFMetadataSet **metadata_sets; 00131 int metadata_sets_count; 00132 AVFormatContext *fc; 00133 struct AVAES *aesc; 00134 uint8_t *local_tags; 00135 int local_tags_count; 00136 } MXFContext; 00137 00138 enum MXFWrappingScheme { 00139 Frame, 00140 Clip, 00141 }; 00142 00143 typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid); 00144 00145 typedef struct { 00146 const UID key; 00147 MXFMetadataReadFunc *read; 00148 int ctx_size; 00149 enum MXFMetadataSetType type; 00150 } MXFMetadataReadTableEntry; 00151 00152 /* partial keys to match */ 00153 static const uint8_t mxf_header_partition_pack_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 }; 00154 static const uint8_t mxf_essence_element_key[] = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 }; 00155 static const uint8_t mxf_klv_key[] = { 0x06,0x0e,0x2b,0x34 }; 00156 /* complete keys to match */ 00157 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 }; 00158 static const uint8_t mxf_encrypted_triplet_key[] = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 }; 00159 static const uint8_t mxf_encrypted_essence_container[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 }; 00160 static const uint8_t mxf_sony_mpeg4_extradata[] = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 }; 00161 00162 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y))) 00163 00164 static int64_t klv_decode_ber_length(AVIOContext *pb) 00165 { 00166 uint64_t size = avio_r8(pb); 00167 if (size & 0x80) { /* long form */ 00168 int bytes_num = size & 0x7f; 00169 /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */ 00170 if (bytes_num > 8) 00171 return -1; 00172 size = 0; 00173 while (bytes_num--) 00174 size = size << 8 | avio_r8(pb); 00175 } 00176 return size; 00177 } 00178 00179 static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size) 00180 { 00181 int i, b; 00182 for (i = 0; i < size && !pb->eof_reached; i++) { 00183 b = avio_r8(pb); 00184 if (b == key[0]) 00185 i = 0; 00186 else if (b != key[i]) 00187 i = -1; 00188 } 00189 return i == size; 00190 } 00191 00192 static int klv_read_packet(KLVPacket *klv, AVIOContext *pb) 00193 { 00194 if (!mxf_read_sync(pb, mxf_klv_key, 4)) 00195 return -1; 00196 klv->offset = avio_tell(pb) - 4; 00197 memcpy(klv->key, mxf_klv_key, 4); 00198 avio_read(pb, klv->key + 4, 12); 00199 klv->length = klv_decode_ber_length(pb); 00200 return klv->length == -1 ? -1 : 0; 00201 } 00202 00203 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv) 00204 { 00205 int i; 00206 00207 for (i = 0; i < s->nb_streams; i++) { 00208 MXFTrack *track = s->streams[i]->priv_data; 00209 /* SMPTE 379M 7.3 */ 00210 if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number))) 00211 return i; 00212 } 00213 /* return 0 if only one stream, for OP Atom files with 0 as track number */ 00214 return s->nb_streams == 1 ? 0 : -1; 00215 } 00216 00217 /* XXX: use AVBitStreamFilter */ 00218 static int mxf_get_d10_aes3_packet(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length) 00219 { 00220 const uint8_t *buf_ptr, *end_ptr; 00221 uint8_t *data_ptr; 00222 int i; 00223 00224 if (length > 61444) /* worst case PAL 1920 samples 8 channels */ 00225 return -1; 00226 length = av_get_packet(pb, pkt, length); 00227 if (length < 0) 00228 return length; 00229 data_ptr = pkt->data; 00230 end_ptr = pkt->data + length; 00231 buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */ 00232 for (; buf_ptr + st->codec->channels*4 < end_ptr; ) { 00233 for (i = 0; i < st->codec->channels; i++) { 00234 uint32_t sample = bytestream_get_le32(&buf_ptr); 00235 if (st->codec->bits_per_coded_sample == 24) 00236 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff); 00237 else 00238 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff); 00239 } 00240 buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M 00241 } 00242 av_shrink_packet(pkt, data_ptr - pkt->data); 00243 return 0; 00244 } 00245 00246 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv) 00247 { 00248 static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b}; 00249 MXFContext *mxf = s->priv_data; 00250 AVIOContext *pb = s->pb; 00251 int64_t end = avio_tell(pb) + klv->length; 00252 uint64_t size; 00253 uint64_t orig_size; 00254 uint64_t plaintext_size; 00255 uint8_t ivec[16]; 00256 uint8_t tmpbuf[16]; 00257 int index; 00258 00259 if (!mxf->aesc && s->key && s->keylen == 16) { 00260 mxf->aesc = av_malloc(av_aes_size); 00261 if (!mxf->aesc) 00262 return -1; 00263 av_aes_init(mxf->aesc, s->key, 128, 1); 00264 } 00265 // crypto context 00266 avio_skip(pb, klv_decode_ber_length(pb)); 00267 // plaintext offset 00268 klv_decode_ber_length(pb); 00269 plaintext_size = avio_rb64(pb); 00270 // source klv key 00271 klv_decode_ber_length(pb); 00272 avio_read(pb, klv->key, 16); 00273 if (!IS_KLV_KEY(klv, mxf_essence_element_key)) 00274 return -1; 00275 index = mxf_get_stream_index(s, klv); 00276 if (index < 0) 00277 return -1; 00278 // source size 00279 klv_decode_ber_length(pb); 00280 orig_size = avio_rb64(pb); 00281 if (orig_size < plaintext_size) 00282 return -1; 00283 // enc. code 00284 size = klv_decode_ber_length(pb); 00285 if (size < 32 || size - 32 < orig_size) 00286 return -1; 00287 avio_read(pb, ivec, 16); 00288 avio_read(pb, tmpbuf, 16); 00289 if (mxf->aesc) 00290 av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1); 00291 if (memcmp(tmpbuf, checkv, 16)) 00292 av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n"); 00293 size -= 32; 00294 size = av_get_packet(pb, pkt, size); 00295 if (size < 0) 00296 return size; 00297 else if (size < plaintext_size) 00298 return AVERROR_INVALIDDATA; 00299 size -= plaintext_size; 00300 if (mxf->aesc) 00301 av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size], 00302 &pkt->data[plaintext_size], size >> 4, ivec, 1); 00303 av_shrink_packet(pkt, orig_size); 00304 pkt->stream_index = index; 00305 avio_skip(pb, end - avio_tell(pb)); 00306 return 0; 00307 } 00308 00309 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt) 00310 { 00311 KLVPacket klv; 00312 00313 while (!s->pb->eof_reached) { 00314 if (klv_read_packet(&klv, s->pb) < 0) 00315 return -1; 00316 PRINT_KEY(s, "read packet", klv.key); 00317 av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset); 00318 if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) { 00319 int res = mxf_decrypt_triplet(s, pkt, &klv); 00320 if (res < 0) { 00321 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n"); 00322 return -1; 00323 } 00324 return 0; 00325 } 00326 if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) { 00327 int index = mxf_get_stream_index(s, &klv); 00328 if (index < 0) { 00329 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12)); 00330 goto skip; 00331 } 00332 if (s->streams[index]->discard == AVDISCARD_ALL) 00333 goto skip; 00334 /* check for 8 channels AES3 element */ 00335 if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) { 00336 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) { 00337 av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n"); 00338 return -1; 00339 } 00340 } else { 00341 int ret = av_get_packet(s->pb, pkt, klv.length); 00342 if (ret < 0) 00343 return ret; 00344 } 00345 pkt->stream_index = index; 00346 pkt->pos = klv.offset; 00347 return 0; 00348 } else 00349 skip: 00350 avio_skip(s->pb, klv.length); 00351 } 00352 return AVERROR_EOF; 00353 } 00354 00355 static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00356 { 00357 MXFContext *mxf = arg; 00358 int item_num = avio_rb32(pb); 00359 int item_len = avio_rb32(pb); 00360 00361 if (item_len != 18) { 00362 av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n"); 00363 return -1; 00364 } 00365 if (item_num > UINT_MAX / item_len) 00366 return -1; 00367 mxf->local_tags_count = item_num; 00368 mxf->local_tags = av_malloc(item_num*item_len); 00369 if (!mxf->local_tags) 00370 return -1; 00371 avio_read(pb, mxf->local_tags, item_num*item_len); 00372 return 0; 00373 } 00374 00375 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set) 00376 { 00377 if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets)) 00378 return AVERROR(ENOMEM); 00379 mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets)); 00380 if (!mxf->metadata_sets) 00381 return -1; 00382 mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set; 00383 mxf->metadata_sets_count++; 00384 return 0; 00385 } 00386 00387 static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00388 { 00389 MXFCryptoContext *cryptocontext = arg; 00390 if (size != 16) 00391 return -1; 00392 if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul)) 00393 avio_read(pb, cryptocontext->source_container_ul, 16); 00394 return 0; 00395 } 00396 00397 static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00398 { 00399 MXFContext *mxf = arg; 00400 switch (tag) { 00401 case 0x1901: 00402 mxf->packages_count = avio_rb32(pb); 00403 if (mxf->packages_count >= UINT_MAX / sizeof(UID)) 00404 return -1; 00405 mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID)); 00406 if (!mxf->packages_refs) 00407 return -1; 00408 avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */ 00409 avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID)); 00410 break; 00411 } 00412 return 0; 00413 } 00414 00415 static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00416 { 00417 MXFStructuralComponent *source_clip = arg; 00418 switch(tag) { 00419 case 0x0202: 00420 source_clip->duration = avio_rb64(pb); 00421 break; 00422 case 0x1201: 00423 source_clip->start_position = avio_rb64(pb); 00424 break; 00425 case 0x1101: 00426 /* UMID, only get last 16 bytes */ 00427 avio_skip(pb, 16); 00428 avio_read(pb, source_clip->source_package_uid, 16); 00429 break; 00430 case 0x1102: 00431 source_clip->source_track_id = avio_rb32(pb); 00432 break; 00433 } 00434 return 0; 00435 } 00436 00437 static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00438 { 00439 MXFPackage *package = arg; 00440 switch(tag) { 00441 case 0x4403: 00442 package->tracks_count = avio_rb32(pb); 00443 if (package->tracks_count >= UINT_MAX / sizeof(UID)) 00444 return -1; 00445 package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID)); 00446 if (!package->tracks_refs) 00447 return -1; 00448 avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */ 00449 avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID)); 00450 break; 00451 } 00452 return 0; 00453 } 00454 00455 static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00456 { 00457 MXFTrack *track = arg; 00458 switch(tag) { 00459 case 0x4801: 00460 track->track_id = avio_rb32(pb); 00461 break; 00462 case 0x4804: 00463 avio_read(pb, track->track_number, 4); 00464 break; 00465 case 0x4B01: 00466 track->edit_rate.den = avio_rb32(pb); 00467 track->edit_rate.num = avio_rb32(pb); 00468 break; 00469 case 0x4803: 00470 avio_read(pb, track->sequence_ref, 16); 00471 break; 00472 } 00473 return 0; 00474 } 00475 00476 static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00477 { 00478 MXFSequence *sequence = arg; 00479 switch(tag) { 00480 case 0x0202: 00481 sequence->duration = avio_rb64(pb); 00482 break; 00483 case 0x0201: 00484 avio_read(pb, sequence->data_definition_ul, 16); 00485 break; 00486 case 0x1001: 00487 sequence->structural_components_count = avio_rb32(pb); 00488 if (sequence->structural_components_count >= UINT_MAX / sizeof(UID)) 00489 return -1; 00490 sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID)); 00491 if (!sequence->structural_components_refs) 00492 return -1; 00493 avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */ 00494 avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID)); 00495 break; 00496 } 00497 return 0; 00498 } 00499 00500 static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00501 { 00502 MXFPackage *package = arg; 00503 switch(tag) { 00504 case 0x4403: 00505 package->tracks_count = avio_rb32(pb); 00506 if (package->tracks_count >= UINT_MAX / sizeof(UID)) 00507 return -1; 00508 package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID)); 00509 if (!package->tracks_refs) 00510 return -1; 00511 avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */ 00512 avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID)); 00513 break; 00514 case 0x4401: 00515 /* UMID, only get last 16 bytes */ 00516 avio_skip(pb, 16); 00517 avio_read(pb, package->package_uid, 16); 00518 break; 00519 case 0x4701: 00520 avio_read(pb, package->descriptor_ref, 16); 00521 break; 00522 } 00523 return 0; 00524 } 00525 00526 static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00527 { 00528 switch(tag) { 00529 case 0x3F05: av_dlog(NULL, "EditUnitByteCount %d\n", avio_rb32(pb)); break; 00530 case 0x3F06: av_dlog(NULL, "IndexSID %d\n", avio_rb32(pb)); break; 00531 case 0x3F07: av_dlog(NULL, "BodySID %d\n", avio_rb32(pb)); break; 00532 case 0x3F0B: av_dlog(NULL, "IndexEditRate %d/%d\n", avio_rb32(pb), avio_rb32(pb)); break; 00533 case 0x3F0C: av_dlog(NULL, "IndexStartPosition %"PRIu64"\n", avio_rb64(pb)); break; 00534 case 0x3F0D: av_dlog(NULL, "IndexDuration %"PRIu64"\n", avio_rb64(pb)); break; 00535 } 00536 return 0; 00537 } 00538 00539 static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor) 00540 { 00541 int code, value, ofs = 0; 00542 char layout[16] = {0}; 00543 00544 do { 00545 code = avio_r8(pb); 00546 value = avio_r8(pb); 00547 av_dlog(NULL, "pixel layout: code %#x\n", code); 00548 00549 if (ofs < 16) { 00550 layout[ofs++] = code; 00551 layout[ofs++] = value; 00552 } 00553 } while (code != 0); /* SMPTE 377M E.2.46 */ 00554 00555 ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt); 00556 } 00557 00558 static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid) 00559 { 00560 MXFDescriptor *descriptor = arg; 00561 switch(tag) { 00562 case 0x3F01: 00563 descriptor->sub_descriptors_count = avio_rb32(pb); 00564 if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID)) 00565 return -1; 00566 descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID)); 00567 if (!descriptor->sub_descriptors_refs) 00568 return -1; 00569 avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */ 00570 avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID)); 00571 break; 00572 case 0x3004: 00573 avio_read(pb, descriptor->essence_container_ul, 16); 00574 break; 00575 case 0x3006: 00576 descriptor->linked_track_id = avio_rb32(pb); 00577 break; 00578 case 0x3201: /* PictureEssenceCoding */ 00579 avio_read(pb, descriptor->essence_codec_ul, 16); 00580 break; 00581 case 0x3203: 00582 descriptor->width = avio_rb32(pb); 00583 break; 00584 case 0x3202: 00585 descriptor->height = avio_rb32(pb); 00586 break; 00587 case 0x320E: 00588 descriptor->aspect_ratio.num = avio_rb32(pb); 00589 descriptor->aspect_ratio.den = avio_rb32(pb); 00590 break; 00591 case 0x3D03: 00592 descriptor->sample_rate.num = avio_rb32(pb); 00593 descriptor->sample_rate.den = avio_rb32(pb); 00594 break; 00595 case 0x3D06: /* SoundEssenceCompression */ 00596 avio_read(pb, descriptor->essence_codec_ul, 16); 00597 break; 00598 case 0x3D07: 00599 descriptor->channels = avio_rb32(pb); 00600 break; 00601 case 0x3D01: 00602 descriptor->bits_per_sample = avio_rb32(pb); 00603 break; 00604 case 0x3401: 00605 mxf_read_pixel_layout(pb, descriptor); 00606 break; 00607 default: 00608 /* Private uid used by SONY C0023S01.mxf */ 00609 if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) { 00610 descriptor->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); 00611 if (!descriptor->extradata) 00612 return -1; 00613 descriptor->extradata_size = size; 00614 avio_read(pb, descriptor->extradata, size); 00615 } 00616 break; 00617 } 00618 return 0; 00619 } 00620 00621 /* 00622 * Match an uid independently of the version byte and up to len common bytes 00623 * Returns: boolean 00624 */ 00625 static int mxf_match_uid(const UID key, const UID uid, int len) 00626 { 00627 int i; 00628 for (i = 0; i < len; i++) { 00629 if (i != 7 && key[i] != uid[i]) 00630 return 0; 00631 } 00632 return 1; 00633 } 00634 00635 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid) 00636 { 00637 while (uls->uid[0]) { 00638 if(mxf_match_uid(uls->uid, *uid, uls->matching_len)) 00639 break; 00640 uls++; 00641 } 00642 return uls; 00643 } 00644 00645 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type) 00646 { 00647 int i; 00648 00649 if (!strong_ref) 00650 return NULL; 00651 for (i = 0; i < mxf->metadata_sets_count; i++) { 00652 if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) && 00653 (type == AnyType || mxf->metadata_sets[i]->type == type)) { 00654 return mxf->metadata_sets[i]; 00655 } 00656 } 00657 return NULL; 00658 } 00659 00660 static const MXFCodecUL mxf_essence_container_uls[] = { 00661 // video essence container uls 00662 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */ 00663 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14, CODEC_ID_DVVIDEO }, /* DV 625 25mbps */ 00664 // sound essence container uls 00665 { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */ 00666 { { 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 */ 00667 { { 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 */ 00668 { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, 0, CODEC_ID_NONE }, 00669 }; 00670 00671 static int mxf_parse_structural_metadata(MXFContext *mxf) 00672 { 00673 MXFPackage *material_package = NULL; 00674 MXFPackage *temp_package = NULL; 00675 int i, j, k; 00676 00677 av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count); 00678 /* TODO: handle multiple material packages (OP3x) */ 00679 for (i = 0; i < mxf->packages_count; i++) { 00680 material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage); 00681 if (material_package) break; 00682 } 00683 if (!material_package) { 00684 av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n"); 00685 return -1; 00686 } 00687 00688 for (i = 0; i < material_package->tracks_count; i++) { 00689 MXFPackage *source_package = NULL; 00690 MXFTrack *material_track = NULL; 00691 MXFTrack *source_track = NULL; 00692 MXFTrack *temp_track = NULL; 00693 MXFDescriptor *descriptor = NULL; 00694 MXFStructuralComponent *component = NULL; 00695 UID *essence_container_ul = NULL; 00696 const MXFCodecUL *codec_ul = NULL; 00697 const MXFCodecUL *container_ul = NULL; 00698 AVStream *st; 00699 00700 if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) { 00701 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n"); 00702 continue; 00703 } 00704 00705 if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) { 00706 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n"); 00707 continue; 00708 } 00709 00710 /* TODO: handle multiple source clips */ 00711 for (j = 0; j < material_track->sequence->structural_components_count; j++) { 00712 /* TODO: handle timecode component */ 00713 component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip); 00714 if (!component) 00715 continue; 00716 00717 for (k = 0; k < mxf->packages_count; k++) { 00718 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage); 00719 if (!temp_package) 00720 continue; 00721 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) { 00722 source_package = temp_package; 00723 break; 00724 } 00725 } 00726 if (!source_package) { 00727 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id); 00728 break; 00729 } 00730 for (k = 0; k < source_package->tracks_count; k++) { 00731 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) { 00732 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n"); 00733 return -1; 00734 } 00735 if (temp_track->track_id == component->source_track_id) { 00736 source_track = temp_track; 00737 break; 00738 } 00739 } 00740 if (!source_track) { 00741 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id); 00742 break; 00743 } 00744 } 00745 if (!source_track) 00746 continue; 00747 00748 st = av_new_stream(mxf->fc, source_track->track_id); 00749 if (!st) { 00750 av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n"); 00751 return -1; 00752 } 00753 st->priv_data = source_track; 00754 st->duration = component->duration; 00755 if (st->duration == -1) 00756 st->duration = AV_NOPTS_VALUE; 00757 st->start_time = component->start_position; 00758 av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den); 00759 00760 if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) { 00761 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n"); 00762 return -1; 00763 } 00764 00765 PRINT_KEY(mxf->fc, "data definition ul", source_track->sequence->data_definition_ul); 00766 codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul); 00767 st->codec->codec_type = codec_ul->id; 00768 00769 source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType); 00770 if (source_package->descriptor) { 00771 if (source_package->descriptor->type == MultipleDescriptor) { 00772 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) { 00773 MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor); 00774 00775 if (!sub_descriptor) { 00776 av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n"); 00777 continue; 00778 } 00779 if (sub_descriptor->linked_track_id == source_track->track_id) { 00780 descriptor = sub_descriptor; 00781 break; 00782 } 00783 } 00784 } else if (source_package->descriptor->type == Descriptor) 00785 descriptor = source_package->descriptor; 00786 } 00787 if (!descriptor) { 00788 av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index); 00789 continue; 00790 } 00791 PRINT_KEY(mxf->fc, "essence codec ul", descriptor->essence_codec_ul); 00792 PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul); 00793 essence_container_ul = &descriptor->essence_container_ul; 00794 /* HACK: replacing the original key with mxf_encrypted_essence_container 00795 * is not allowed according to s429-6, try to find correct information anyway */ 00796 if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) { 00797 av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n"); 00798 for (k = 0; k < mxf->metadata_sets_count; k++) { 00799 MXFMetadataSet *metadata = mxf->metadata_sets[k]; 00800 if (metadata->type == CryptoContext) { 00801 essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul; 00802 break; 00803 } 00804 } 00805 } 00806 /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */ 00807 codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul); 00808 st->codec->codec_id = codec_ul->id; 00809 if (descriptor->extradata) { 00810 st->codec->extradata = descriptor->extradata; 00811 st->codec->extradata_size = descriptor->extradata_size; 00812 } 00813 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { 00814 container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul); 00815 if (st->codec->codec_id == CODEC_ID_NONE) 00816 st->codec->codec_id = container_ul->id; 00817 st->codec->width = descriptor->width; 00818 st->codec->height = descriptor->height; 00819 if (st->codec->codec_id == CODEC_ID_RAWVIDEO) 00820 st->codec->pix_fmt = descriptor->pix_fmt; 00821 st->need_parsing = AVSTREAM_PARSE_HEADERS; 00822 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { 00823 container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul); 00824 if (st->codec->codec_id == CODEC_ID_NONE) 00825 st->codec->codec_id = container_ul->id; 00826 st->codec->channels = descriptor->channels; 00827 st->codec->bits_per_coded_sample = descriptor->bits_per_sample; 00828 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den; 00829 /* TODO: implement CODEC_ID_RAWAUDIO */ 00830 if (st->codec->codec_id == CODEC_ID_PCM_S16LE) { 00831 if (descriptor->bits_per_sample == 24) 00832 st->codec->codec_id = CODEC_ID_PCM_S24LE; 00833 else if (descriptor->bits_per_sample == 32) 00834 st->codec->codec_id = CODEC_ID_PCM_S32LE; 00835 } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) { 00836 if (descriptor->bits_per_sample == 24) 00837 st->codec->codec_id = CODEC_ID_PCM_S24BE; 00838 else if (descriptor->bits_per_sample == 32) 00839 st->codec->codec_id = CODEC_ID_PCM_S32BE; 00840 } else if (st->codec->codec_id == CODEC_ID_MP2) { 00841 st->need_parsing = AVSTREAM_PARSE_FULL; 00842 } 00843 } 00844 if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) { 00845 av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n"); 00846 st->need_parsing = AVSTREAM_PARSE_FULL; 00847 } 00848 } 00849 return 0; 00850 } 00851 00852 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = { 00853 { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack }, 00854 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType }, 00855 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage }, 00856 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage }, 00857 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence }, 00858 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip }, 00859 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor }, 00860 { { 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 */ 00861 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */ 00862 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */ 00863 { { 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 */ 00864 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */ 00865 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */ 00866 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */ 00867 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */ 00868 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext }, 00869 { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment }, 00870 { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType }, 00871 }; 00872 00873 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type) 00874 { 00875 AVIOContext *pb = mxf->fc->pb; 00876 MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf; 00877 uint64_t klv_end = avio_tell(pb) + klv->length; 00878 00879 if (!ctx) 00880 return -1; 00881 while (avio_tell(pb) + 4 < klv_end) { 00882 int tag = avio_rb16(pb); 00883 int size = avio_rb16(pb); /* KLV specified by 0x53 */ 00884 uint64_t next = avio_tell(pb) + size; 00885 UID uid = {0}; 00886 00887 av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size); 00888 if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */ 00889 av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag); 00890 continue; 00891 } 00892 if (tag > 0x7FFF) { /* dynamic tag */ 00893 int i; 00894 for (i = 0; i < mxf->local_tags_count; i++) { 00895 int local_tag = AV_RB16(mxf->local_tags+i*18); 00896 if (local_tag == tag) { 00897 memcpy(uid, mxf->local_tags+i*18+2, 16); 00898 av_dlog(mxf->fc, "local tag %#04x\n", local_tag); 00899 PRINT_KEY(mxf->fc, "uid", uid); 00900 } 00901 } 00902 } 00903 if (ctx_size && tag == 0x3C0A) 00904 avio_read(pb, ctx->uid, 16); 00905 else if (read_child(ctx, pb, tag, size, uid) < 0) 00906 return -1; 00907 00908 avio_seek(pb, next, SEEK_SET); 00909 } 00910 if (ctx_size) ctx->type = type; 00911 return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0; 00912 } 00913 00914 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap) 00915 { 00916 MXFContext *mxf = s->priv_data; 00917 KLVPacket klv; 00918 00919 if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) { 00920 av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n"); 00921 return -1; 00922 } 00923 avio_seek(s->pb, -14, SEEK_CUR); 00924 mxf->fc = s; 00925 while (!s->pb->eof_reached) { 00926 const MXFMetadataReadTableEntry *metadata; 00927 00928 if (klv_read_packet(&klv, s->pb) < 0) 00929 return -1; 00930 PRINT_KEY(s, "read header", klv.key); 00931 av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset); 00932 if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) || 00933 IS_KLV_KEY(klv.key, mxf_essence_element_key)) { 00934 /* FIXME avoid seek */ 00935 avio_seek(s->pb, klv.offset, SEEK_SET); 00936 break; 00937 } 00938 00939 for (metadata = mxf_metadata_read_table; metadata->read; metadata++) { 00940 if (IS_KLV_KEY(klv.key, metadata->key)) { 00941 int res; 00942 if (klv.key[5] == 0x53) { 00943 res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type); 00944 } else 00945 res = metadata->read(mxf, s->pb, 0, 0, NULL); 00946 if (res < 0) { 00947 av_log(s, AV_LOG_ERROR, "error reading header metadata\n"); 00948 return -1; 00949 } 00950 break; 00951 } 00952 } 00953 if (!metadata->read) 00954 avio_skip(s->pb, klv.length); 00955 } 00956 return mxf_parse_structural_metadata(mxf); 00957 } 00958 00959 static int mxf_read_close(AVFormatContext *s) 00960 { 00961 MXFContext *mxf = s->priv_data; 00962 int i; 00963 00964 av_freep(&mxf->packages_refs); 00965 00966 for (i = 0; i < s->nb_streams; i++) 00967 s->streams[i]->priv_data = NULL; 00968 00969 for (i = 0; i < mxf->metadata_sets_count; i++) { 00970 switch (mxf->metadata_sets[i]->type) { 00971 case MultipleDescriptor: 00972 av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs); 00973 break; 00974 case Sequence: 00975 av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs); 00976 break; 00977 case SourcePackage: 00978 case MaterialPackage: 00979 av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs); 00980 break; 00981 default: 00982 break; 00983 } 00984 av_freep(&mxf->metadata_sets[i]); 00985 } 00986 av_freep(&mxf->metadata_sets); 00987 av_freep(&mxf->aesc); 00988 av_freep(&mxf->local_tags); 00989 return 0; 00990 } 00991 00992 static int mxf_probe(AVProbeData *p) { 00993 uint8_t *bufp = p->buf; 00994 uint8_t *end = p->buf + p->buf_size; 00995 00996 if (p->buf_size < sizeof(mxf_header_partition_pack_key)) 00997 return 0; 00998 00999 /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */ 01000 end -= sizeof(mxf_header_partition_pack_key); 01001 for (; bufp < end; bufp++) { 01002 if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key)) 01003 return AVPROBE_SCORE_MAX; 01004 } 01005 return 0; 01006 } 01007 01008 /* rudimentary byte seek */ 01009 /* XXX: use MXF Index */ 01010 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags) 01011 { 01012 AVStream *st = s->streams[stream_index]; 01013 int64_t seconds; 01014 01015 if (!s->bit_rate) 01016 return -1; 01017 if (sample_time < 0) 01018 sample_time = 0; 01019 seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den); 01020 avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET); 01021 av_update_cur_dts(s, st, sample_time); 01022 return 0; 01023 } 01024 01025 AVInputFormat ff_mxf_demuxer = { 01026 "mxf", 01027 NULL_IF_CONFIG_SMALL("Material eXchange Format"), 01028 sizeof(MXFContext), 01029 mxf_probe, 01030 mxf_read_header, 01031 mxf_read_packet, 01032 mxf_read_close, 01033 mxf_read_seek, 01034 };