FFmpeg: libavformat/mxfdec.c Source File

00001 /*
00002  * MXF demuxer.
00003  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 /*
00023  * References
00024  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
00025  * SMPTE 377M MXF File Format Specifications
00026  * SMPTE 378M Operational Pattern 1a
00027  * SMPTE 379M MXF Generic Container
00028  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
00029  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
00030  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
00031  *
00032  * Principle
00033  * Search for Track numbers which will identify essence element KLV packets.
00034  * Search for SourcePackage which define tracks which contains Track numbers.
00035  * Material Package contains tracks with reference to SourcePackage tracks.
00036  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
00037  * Assign Descriptors to correct Tracks.
00038  *
00039  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
00040  * Metadata parsing resolves Strong References to objects.
00041  *
00042  * Simple demuxer, only OP1A supported and some files might not work at all.
00043  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
00044  */
00045 
00046 //#define DEBUG
00047 
00048 #include "libavutil/aes.h"
00049 #include "libavcodec/bytestream.h"
00050 #include "avformat.h"
00051 #include "mxf.h"
00052 
00053 typedef struct {
00054     UID uid;
00055     enum MXFMetadataSetType type;
00056     UID source_container_ul;
00057 } MXFCryptoContext;
00058 
00059 typedef struct {
00060     UID uid;
00061     enum MXFMetadataSetType type;
00062     UID source_package_uid;
00063     UID data_definition_ul;
00064     int64_t duration;
00065     int64_t start_position;
00066     int source_track_id;
00067 } MXFStructuralComponent;
00068 
00069 typedef struct {
00070     UID uid;
00071     enum MXFMetadataSetType type;
00072     UID data_definition_ul;
00073     UID *structural_components_refs;
00074     int structural_components_count;
00075     int64_t duration;
00076 } MXFSequence;
00077 
00078 typedef struct {
00079     UID uid;
00080     enum MXFMetadataSetType type;
00081     MXFSequence *sequence; /* mandatory, and only one */
00082     UID sequence_ref;
00083     int track_id;
00084     uint8_t track_number[4];
00085     AVRational edit_rate;
00086 } MXFTrack;
00087 
00088 typedef struct {
00089     UID uid;
00090     enum MXFMetadataSetType type;
00091     UID essence_container_ul;
00092     UID essence_codec_ul;
00093     AVRational sample_rate;
00094     AVRational aspect_ratio;
00095     int width;
00096     int height;
00097     int channels;
00098     int bits_per_sample;
00099     UID *sub_descriptors_refs;
00100     int sub_descriptors_count;
00101     int linked_track_id;
00102     uint8_t *extradata;
00103     int extradata_size;
00104 } MXFDescriptor;
00105 
00106 typedef struct {
00107     UID uid;
00108     enum MXFMetadataSetType type;
00109 } MXFIndexTableSegment;
00110 
00111 typedef struct {
00112     UID uid;
00113     enum MXFMetadataSetType type;
00114     UID package_uid;
00115     UID *tracks_refs;
00116     int tracks_count;
00117     MXFDescriptor *descriptor; /* only one */
00118     UID descriptor_ref;
00119 } MXFPackage;
00120 
00121 typedef struct {
00122     UID uid;
00123     enum MXFMetadataSetType type;
00124 } MXFMetadataSet;
00125 
00126 typedef struct {
00127     UID *packages_refs;
00128     int packages_count;
00129     MXFMetadataSet **metadata_sets;
00130     int metadata_sets_count;
00131     AVFormatContext *fc;
00132     struct AVAES *aesc;
00133     uint8_t *local_tags;
00134     int local_tags_count;
00135 } MXFContext;
00136 
00137 enum MXFWrappingScheme {
00138     Frame,
00139     Clip,
00140 };
00141 
00142 typedef struct {
00143     const UID key;
00144     int (*read)();
00145     int ctx_size;
00146     enum MXFMetadataSetType type;
00147 } MXFMetadataReadTableEntry;
00148 
00149 /* partial keys to match */
00150 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
00151 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
00152 static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
00153 /* complete keys to match */
00154 static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
00155 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
00156 static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
00157 static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
00158 
00159 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
00160 
00161 static int64_t klv_decode_ber_length(ByteIOContext *pb)
00162 {
00163     uint64_t size = get_byte(pb);
00164     if (size & 0x80) { /* long form */
00165         int bytes_num = size & 0x7f;
00166         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
00167         if (bytes_num > 8)
00168             return -1;
00169         size = 0;
00170         while (bytes_num--)
00171             size = size << 8 | get_byte(pb);
00172     }
00173     return size;
00174 }
00175 
00176 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
00177 {
00178     int i, b;
00179     for (i = 0; i < size && !url_feof(pb); i++) {
00180         b = get_byte(pb);
00181         if (b == key[0])
00182             i = 0;
00183         else if (b != key[i])
00184             i = -1;
00185     }
00186     return i == size;
00187 }
00188 
00189 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
00190 {
00191     if (!mxf_read_sync(pb, mxf_klv_key, 4))
00192         return -1;
00193     klv->offset = url_ftell(pb) - 4;
00194     memcpy(klv->key, mxf_klv_key, 4);
00195     get_buffer(pb, klv->key + 4, 12);
00196     klv->length = klv_decode_ber_length(pb);
00197     return klv->length == -1 ? -1 : 0;
00198 }
00199 
00200 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
00201 {
00202     int i;
00203 
00204     for (i = 0; i < s->nb_streams; i++) {
00205         MXFTrack *track = s->streams[i]->priv_data;
00206         /* SMPTE 379M 7.3 */
00207         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
00208             return i;
00209     }
00210     /* return 0 if only one stream, for OP Atom files with 0 as track number */
00211     return s->nb_streams == 1 ? 0 : -1;
00212 }
00213 
00214 /* XXX: use AVBitStreamFilter */
00215 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
00216 {
00217     uint8_t buffer[61444];
00218     const uint8_t *buf_ptr, *end_ptr;
00219     uint8_t *data_ptr;
00220     int i;
00221 
00222     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
00223         return -1;
00224     get_buffer(pb, buffer, length);
00225     av_new_packet(pkt, length);
00226     data_ptr = pkt->data;
00227     end_ptr = buffer + length;
00228     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
00229     for (; buf_ptr < end_ptr; ) {
00230         for (i = 0; i < st->codec->channels; i++) {
00231             uint32_t sample = bytestream_get_le32(&buf_ptr);
00232             if (st->codec->bits_per_coded_sample == 24)
00233                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
00234             else
00235                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
00236         }
00237         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
00238     }
00239     pkt->size = data_ptr - pkt->data;
00240     return 0;
00241 }
00242 
00243 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
00244 {
00245     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
00246     MXFContext *mxf = s->priv_data;
00247     ByteIOContext *pb = s->pb;
00248     int64_t end = url_ftell(pb) + klv->length;
00249     uint64_t size;
00250     uint64_t orig_size;
00251     uint64_t plaintext_size;
00252     uint8_t ivec[16];
00253     uint8_t tmpbuf[16];
00254     int index;
00255 
00256     if (!mxf->aesc && s->key && s->keylen == 16) {
00257         mxf->aesc = av_malloc(av_aes_size);
00258         if (!mxf->aesc)
00259             return -1;
00260         av_aes_init(mxf->aesc, s->key, 128, 1);
00261     }
00262     // crypto context
00263     url_fskip(pb, klv_decode_ber_length(pb));
00264     // plaintext offset
00265     klv_decode_ber_length(pb);
00266     plaintext_size = get_be64(pb);
00267     // source klv key
00268     klv_decode_ber_length(pb);
00269     get_buffer(pb, klv->key, 16);
00270     if (!IS_KLV_KEY(klv, mxf_essence_element_key))
00271         return -1;
00272     index = mxf_get_stream_index(s, klv);
00273     if (index < 0)
00274         return -1;
00275     // source size
00276     klv_decode_ber_length(pb);
00277     orig_size = get_be64(pb);
00278     if (orig_size < plaintext_size)
00279         return -1;
00280     // enc. code
00281     size = klv_decode_ber_length(pb);
00282     if (size < 32 || size - 32 < orig_size)
00283         return -1;
00284     get_buffer(pb, ivec, 16);
00285     get_buffer(pb, tmpbuf, 16);
00286     if (mxf->aesc)
00287         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
00288     if (memcmp(tmpbuf, checkv, 16))
00289         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
00290     size -= 32;
00291     av_get_packet(pb, pkt, size);
00292     size -= plaintext_size;
00293     if (mxf->aesc)
00294         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
00295                      &pkt->data[plaintext_size], size >> 4, ivec, 1);
00296     pkt->size = orig_size;
00297     pkt->stream_index = index;
00298     url_fskip(pb, end - url_ftell(pb));
00299     return 0;
00300 }
00301 
00302 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
00303 {
00304     KLVPacket klv;
00305 
00306     while (!url_feof(s->pb)) {
00307         if (klv_read_packet(&klv, s->pb) < 0)
00308             return -1;
00309         PRINT_KEY(s, "read packet", klv.key);
00310         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);
00311         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
00312             int res = mxf_decrypt_triplet(s, pkt, &klv);
00313             if (res < 0) {
00314                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
00315                 return -1;
00316             }
00317             return 0;
00318         }
00319         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
00320             int index = mxf_get_stream_index(s, &klv);
00321             if (index < 0) {
00322                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));
00323                 goto skip;
00324             }
00325             if (s->streams[index]->discard == AVDISCARD_ALL)
00326                 goto skip;
00327             /* check for 8 channels AES3 element */
00328             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
00329                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
00330                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
00331                     return -1;
00332                 }
00333             } else
00334                 av_get_packet(s->pb, pkt, klv.length);
00335             pkt->stream_index = index;
00336             pkt->pos = klv.offset;
00337             return 0;
00338         } else
00339         skip:
00340             url_fskip(s->pb, klv.length);
00341     }
00342     return AVERROR(EIO);
00343 }
00344 
00345 static int mxf_read_primer_pack(MXFContext *mxf)
00346 {
00347     ByteIOContext *pb = mxf->fc->pb;
00348     int item_num = get_be32(pb);
00349     int item_len = get_be32(pb);
00350 
00351     if (item_len != 18) {
00352         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
00353         return -1;
00354     }
00355     if (item_num > UINT_MAX / item_len)
00356         return -1;
00357     mxf->local_tags_count = item_num;
00358     mxf->local_tags = av_malloc(item_num*item_len);
00359     if (!mxf->local_tags)
00360         return -1;
00361     get_buffer(pb, mxf->local_tags, item_num*item_len);
00362     return 0;
00363 }
00364 
00365 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
00366 {
00367     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
00368     if (!mxf->metadata_sets)
00369         return -1;
00370     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
00371     mxf->metadata_sets_count++;
00372     return 0;
00373 }
00374 
00375 static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
00376 {
00377     if (size != 16)
00378         return -1;
00379     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
00380         get_buffer(pb, cryptocontext->source_container_ul, 16);
00381     return 0;
00382 }
00383 
00384 static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
00385 {
00386     switch (tag) {
00387     case 0x1901:
00388         mxf->packages_count = get_be32(pb);
00389         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
00390             return -1;
00391         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
00392         if (!mxf->packages_refs)
00393             return -1;
00394         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
00395         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
00396         break;
00397     }
00398     return 0;
00399 }
00400 
00401 static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
00402 {
00403     switch(tag) {
00404     case 0x0202:
00405         source_clip->duration = get_be64(pb);
00406         break;
00407     case 0x1201:
00408         source_clip->start_position = get_be64(pb);
00409         break;
00410     case 0x1101:
00411         /* UMID, only get last 16 bytes */
00412         url_fskip(pb, 16);
00413         get_buffer(pb, source_clip->source_package_uid, 16);
00414         break;
00415     case 0x1102:
00416         source_clip->source_track_id = get_be32(pb);
00417         break;
00418     }
00419     return 0;
00420 }
00421 
00422 static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
00423 {
00424     switch(tag) {
00425     case 0x4403:
00426         package->tracks_count = get_be32(pb);
00427         if (package->tracks_count >= UINT_MAX / sizeof(UID))
00428             return -1;
00429         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
00430         if (!package->tracks_refs)
00431             return -1;
00432         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
00433         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
00434         break;
00435     }
00436     return 0;
00437 }
00438 
00439 static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
00440 {
00441     switch(tag) {
00442     case 0x4801:
00443         track->track_id = get_be32(pb);
00444         break;
00445     case 0x4804:
00446         get_buffer(pb, track->track_number, 4);
00447         break;
00448     case 0x4B01:
00449         track->edit_rate.den = get_be32(pb);
00450         track->edit_rate.num = get_be32(pb);
00451         break;
00452     case 0x4803:
00453         get_buffer(pb, track->sequence_ref, 16);
00454         break;
00455     }
00456     return 0;
00457 }
00458 
00459 static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
00460 {
00461     switch(tag) {
00462     case 0x0202:
00463         sequence->duration = get_be64(pb);
00464         break;
00465     case 0x0201:
00466         get_buffer(pb, sequence->data_definition_ul, 16);
00467         break;
00468     case 0x1001:
00469         sequence->structural_components_count = get_be32(pb);
00470         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
00471             return -1;
00472         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
00473         if (!sequence->structural_components_refs)
00474             return -1;
00475         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
00476         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
00477         break;
00478     }
00479     return 0;
00480 }
00481 
00482 static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
00483 {
00484     switch(tag) {
00485     case 0x4403:
00486         package->tracks_count = get_be32(pb);
00487         if (package->tracks_count >= UINT_MAX / sizeof(UID))
00488             return -1;
00489         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
00490         if (!package->tracks_refs)
00491             return -1;
00492         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
00493         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
00494         break;
00495     case 0x4401:
00496         /* UMID, only get last 16 bytes */
00497         url_fskip(pb, 16);
00498         get_buffer(pb, package->package_uid, 16);
00499         break;
00500     case 0x4701:
00501         get_buffer(pb, package->descriptor_ref, 16);
00502         break;
00503     }
00504     return 0;
00505 }
00506 
00507 static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag)
00508 {
00509     switch(tag) {
00510     case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break;
00511     case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break;
00512     case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break;
00513     case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break;
00514     case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break;
00515     case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break;
00516     }
00517     return 0;
00518 }
00519 
00520 static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
00521 {
00522     int code;
00523 
00524     do {
00525         code = get_byte(pb);
00526         dprintf(NULL, "pixel layout: code %#x\n", code);
00527         switch (code) {
00528         case 0x52: /* R */
00529             descriptor->bits_per_sample += get_byte(pb);
00530             break;
00531         case 0x47: /* G */
00532             descriptor->bits_per_sample += get_byte(pb);
00533             break;
00534         case 0x42: /* B */
00535             descriptor->bits_per_sample += get_byte(pb);
00536             break;
00537         default:
00538             get_byte(pb);
00539         }
00540     } while (code != 0); /* SMPTE 377M E.2.46 */
00541 }
00542 
00543 static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
00544 {
00545     switch(tag) {
00546     case 0x3F01:
00547         descriptor->sub_descriptors_count = get_be32(pb);
00548         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
00549             return -1;
00550         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
00551         if (!descriptor->sub_descriptors_refs)
00552             return -1;
00553         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
00554         get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
00555         break;
00556     case 0x3004:
00557         get_buffer(pb, descriptor->essence_container_ul, 16);
00558         break;
00559     case 0x3006:
00560         descriptor->linked_track_id = get_be32(pb);
00561         break;
00562     case 0x3201: /* PictureEssenceCoding */
00563         get_buffer(pb, descriptor->essence_codec_ul, 16);
00564         break;
00565     case 0x3203:
00566         descriptor->width = get_be32(pb);
00567         break;
00568     case 0x3202:
00569         descriptor->height = get_be32(pb);
00570         break;
00571     case 0x320E:
00572         descriptor->aspect_ratio.num = get_be32(pb);
00573         descriptor->aspect_ratio.den = get_be32(pb);
00574         break;
00575     case 0x3D03:
00576         descriptor->sample_rate.num = get_be32(pb);
00577         descriptor->sample_rate.den = get_be32(pb);
00578         break;
00579     case 0x3D06: /* SoundEssenceCompression */
00580         get_buffer(pb, descriptor->essence_codec_ul, 16);
00581         break;
00582     case 0x3D07:
00583         descriptor->channels = get_be32(pb);
00584         break;
00585     case 0x3D01:
00586         descriptor->bits_per_sample = get_be32(pb);
00587         break;
00588     case 0x3401:
00589         mxf_read_pixel_layout(pb, descriptor);
00590         break;
00591     default:
00592         /* Private uid used by SONY C0023S01.mxf */
00593         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
00594             descriptor->extradata = av_malloc(size);
00595             if (!descriptor->extradata)
00596                 return -1;
00597             descriptor->extradata_size = size;
00598             get_buffer(pb, descriptor->extradata, size);
00599         }
00600         break;
00601     }
00602     return 0;
00603 }
00604 
00605 /*
00606  * Match an uid independently of the version byte and up to len common bytes
00607  * Returns: boolean
00608  */
00609 static int mxf_match_uid(const UID key, const UID uid, int len)
00610 {
00611     int i;
00612     for (i = 0; i < len; i++) {
00613         if (i != 7 && key[i] != uid[i])
00614             return 0;
00615     }
00616     return 1;
00617 }
00618 
00619 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
00620 {
00621     while (uls->uid[0]) {
00622         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
00623             break;
00624         uls++;
00625     }
00626     return uls;
00627 }
00628 
00629 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
00630 {
00631     int i;
00632 
00633     if (!strong_ref)
00634         return NULL;
00635     for (i = 0; i < mxf->metadata_sets_count; i++) {
00636         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
00637             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
00638             return mxf->metadata_sets[i];
00639         }
00640     }
00641     return NULL;
00642 }
00643 
00644 static const MXFCodecUL mxf_essence_container_uls[] = {
00645     // video essence container uls
00646     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
00647     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
00648     // sound essence container uls
00649     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
00650     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
00651     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */
00652     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
00653 };
00654 
00655 static int mxf_parse_structural_metadata(MXFContext *mxf)
00656 {
00657     MXFPackage *material_package = NULL;
00658     MXFPackage *temp_package = NULL;
00659     int i, j, k;
00660 
00661     dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
00662     /* TODO: handle multiple material packages (OP3x) */
00663     for (i = 0; i < mxf->packages_count; i++) {
00664         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
00665         if (material_package) break;
00666     }
00667     if (!material_package) {
00668         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
00669         return -1;
00670     }
00671 
00672     for (i = 0; i < material_package->tracks_count; i++) {
00673         MXFPackage *source_package = NULL;
00674         MXFTrack *material_track = NULL;
00675         MXFTrack *source_track = NULL;
00676         MXFTrack *temp_track = NULL;
00677         MXFDescriptor *descriptor = NULL;
00678         MXFStructuralComponent *component = NULL;
00679         UID *essence_container_ul = NULL;
00680         const MXFCodecUL *codec_ul = NULL;
00681         const MXFCodecUL *container_ul = NULL;
00682         AVStream *st;
00683 
00684         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
00685             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
00686             continue;
00687         }
00688 
00689         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
00690             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
00691             return -1;
00692         }
00693 
00694         /* TODO: handle multiple source clips */
00695         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
00696             /* TODO: handle timecode component */
00697             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
00698             if (!component)
00699                 continue;
00700 
00701             for (k = 0; k < mxf->packages_count; k++) {
00702                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
00703                 if (!temp_package)
00704                     continue;
00705                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
00706                     source_package = temp_package;
00707                     break;
00708                 }
00709             }
00710             if (!source_package) {
00711                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
00712                 break;
00713             }
00714             for (k = 0; k < source_package->tracks_count; k++) {
00715                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
00716                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
00717                     return -1;
00718                 }
00719                 if (temp_track->track_id == component->source_track_id) {
00720                     source_track = temp_track;
00721                     break;
00722                 }
00723             }
00724             if (!source_track) {
00725                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
00726                 break;
00727             }
00728         }
00729         if (!source_track)
00730             continue;
00731 
00732         st = av_new_stream(mxf->fc, source_track->track_id);
00733         if (!st) {
00734             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
00735             return -1;
00736         }
00737         st->priv_data = source_track;
00738         st->duration = component->duration;
00739         if (st->duration == -1)
00740             st->duration = AV_NOPTS_VALUE;
00741         st->start_time = component->start_position;
00742         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
00743 
00744         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
00745             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
00746             return -1;
00747         }
00748 
00749         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
00750         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
00751         st->codec->codec_type = codec_ul->id;
00752 
00753         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
00754         if (source_package->descriptor) {
00755             if (source_package->descriptor->type == MultipleDescriptor) {
00756                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
00757                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
00758 
00759                     if (!sub_descriptor) {
00760                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
00761                         continue;
00762                     }
00763                     if (sub_descriptor->linked_track_id == source_track->track_id) {
00764                         descriptor = sub_descriptor;
00765                         break;
00766                     }
00767                 }
00768             } else if (source_package->descriptor->type == Descriptor)
00769                 descriptor = source_package->descriptor;
00770         }
00771         if (!descriptor) {
00772             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
00773             continue;
00774         }
00775         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
00776         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
00777         essence_container_ul = &descriptor->essence_container_ul;
00778         /* HACK: replacing the original key with mxf_encrypted_essence_container
00779          * is not allowed according to s429-6, try to find correct information anyway */
00780         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
00781             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
00782             for (k = 0; k < mxf->metadata_sets_count; k++) {
00783                 MXFMetadataSet *metadata = mxf->metadata_sets[k];
00784                 if (metadata->type == CryptoContext) {
00785                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
00786                     break;
00787                 }
00788             }
00789         }
00790         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
00791         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
00792         st->codec->codec_id = codec_ul->id;
00793         if (descriptor->extradata) {
00794             st->codec->extradata = descriptor->extradata;
00795             st->codec->extradata_size = descriptor->extradata_size;
00796         }
00797         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
00798             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);
00799             if (st->codec->codec_id == CODEC_ID_NONE)
00800                 st->codec->codec_id = container_ul->id;
00801             st->codec->width = descriptor->width;
00802             st->codec->height = descriptor->height;
00803             st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */
00804             st->need_parsing = AVSTREAM_PARSE_HEADERS;
00805         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
00806             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);
00807             if (st->codec->codec_id == CODEC_ID_NONE)
00808                 st->codec->codec_id = container_ul->id;
00809             st->codec->channels = descriptor->channels;
00810             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;
00811             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
00812             /* TODO: implement CODEC_ID_RAWAUDIO */
00813             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
00814                 if (descriptor->bits_per_sample == 24)
00815                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
00816                 else if (descriptor->bits_per_sample == 32)
00817                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
00818             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
00819                 if (descriptor->bits_per_sample == 24)
00820                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
00821                 else if (descriptor->bits_per_sample == 32)
00822                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
00823             } else if (st->codec->codec_id == CODEC_ID_MP2) {
00824                 st->need_parsing = AVSTREAM_PARSE_FULL;
00825             }
00826         }
00827         if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
00828             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
00829             st->need_parsing = AVSTREAM_PARSE_FULL;
00830         }
00831     }
00832     return 0;
00833 }
00834 
00835 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
00836     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
00837     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
00838     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
00839     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
00840     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
00841     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
00842     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
00843     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
00844     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
00845     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
00846     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
00847     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
00848     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
00849     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
00850     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
00851     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
00852     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
00853     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
00854 };
00855 
00856 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
00857 {
00858     ByteIOContext *pb = mxf->fc->pb;
00859     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
00860     uint64_t klv_end = url_ftell(pb) + klv->length;
00861 
00862     if (!ctx)
00863         return -1;
00864     while (url_ftell(pb) + 4 < klv_end) {
00865         int tag = get_be16(pb);
00866         int size = get_be16(pb); /* KLV specified by 0x53 */
00867         uint64_t next = url_ftell(pb) + size;
00868         UID uid = {0};
00869 
00870         dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size);
00871         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
00872             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
00873             continue;
00874         }
00875         if (tag > 0x7FFF) { /* dynamic tag */
00876             int i;
00877             for (i = 0; i < mxf->local_tags_count; i++) {
00878                 int local_tag = AV_RB16(mxf->local_tags+i*18);
00879                 if (local_tag == tag) {
00880                     memcpy(uid, mxf->local_tags+i*18+2, 16);
00881                     dprintf(mxf->fc, "local tag %#04x\n", local_tag);
00882                     PRINT_KEY(mxf->fc, "uid", uid);
00883                 }
00884             }
00885         }
00886         if (ctx_size && tag == 0x3C0A)
00887             get_buffer(pb, ctx->uid, 16);
00888         else if (read_child(ctx, pb, tag, size, uid) < 0)
00889             return -1;
00890 
00891         url_fseek(pb, next, SEEK_SET);
00892     }
00893     if (ctx_size) ctx->type = type;
00894     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
00895 }
00896 
00897 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00898 {
00899     MXFContext *mxf = s->priv_data;
00900     KLVPacket klv;
00901 
00902     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
00903         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
00904         return -1;
00905     }
00906     url_fseek(s->pb, -14, SEEK_CUR);
00907     mxf->fc = s;
00908     while (!url_feof(s->pb)) {
00909         const MXFMetadataReadTableEntry *metadata;
00910 
00911         if (klv_read_packet(&klv, s->pb) < 0)
00912             return -1;
00913         PRINT_KEY(s, "read header", klv.key);
00914         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);
00915         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
00916             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
00917             /* FIXME avoid seek */
00918             url_fseek(s->pb, klv.offset, SEEK_SET);
00919             break;
00920         }
00921 
00922         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
00923             if (IS_KLV_KEY(klv.key, metadata->key)) {
00924                 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
00925                 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
00926                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
00927                     return -1;
00928                 }
00929                 break;
00930             }
00931         }
00932         if (!metadata->read)
00933             url_fskip(s->pb, klv.length);
00934     }
00935     return mxf_parse_structural_metadata(mxf);
00936 }
00937 
00938 static int mxf_read_close(AVFormatContext *s)
00939 {
00940     MXFContext *mxf = s->priv_data;
00941     int i;
00942 
00943     av_freep(&mxf->packages_refs);
00944     for (i = 0; i < mxf->metadata_sets_count; i++) {
00945         switch (mxf->metadata_sets[i]->type) {
00946         case MultipleDescriptor:
00947             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
00948             break;
00949         case Sequence:
00950             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
00951             break;
00952         case SourcePackage:
00953         case MaterialPackage:
00954             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
00955             break;
00956         case Track:
00957             mxf->metadata_sets[i] = NULL; /* will be freed later */
00958             break;
00959         default:
00960             break;
00961         }
00962         av_freep(&mxf->metadata_sets[i]);
00963     }
00964     av_freep(&mxf->metadata_sets);
00965     av_freep(&mxf->aesc);
00966     av_freep(&mxf->local_tags);
00967     return 0;
00968 }
00969 
00970 static int mxf_probe(AVProbeData *p) {
00971     uint8_t *bufp = p->buf;
00972     uint8_t *end = p->buf + p->buf_size;
00973 
00974     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
00975         return 0;
00976 
00977     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
00978     end -= sizeof(mxf_header_partition_pack_key);
00979     for (; bufp < end; bufp++) {
00980         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
00981             return AVPROBE_SCORE_MAX;
00982     }
00983     return 0;
00984 }
00985 
00986 /* rudimentary byte seek */
00987 /* XXX: use MXF Index */
00988 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
00989 {
00990     AVStream *st = s->streams[stream_index];
00991     int64_t seconds;
00992 
00993     if (!s->bit_rate)
00994         return -1;
00995     if (sample_time < 0)
00996         sample_time = 0;
00997     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
00998     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
00999     av_update_cur_dts(s, st, sample_time);
01000     return 0;
01001 }
01002 
01003 AVInputFormat mxf_demuxer = {
01004     "mxf",
01005     NULL_IF_CONFIG_SMALL("Material eXchange Format"),
01006     sizeof(MXFContext),
01007     mxf_probe,
01008     mxf_read_header,
01009     mxf_read_packet,
01010     mxf_read_close,
01011     mxf_read_seek,
01012 };