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