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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

  3.  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /*

  23.  * References

  24.  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

  28.  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container

  29.  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container

  30.  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container

  31.  *

  32.  * Principle

  33.  * Search for Track numbers which will identify essence element KLV packets.

  34.  * Search for SourcePackage which define tracks which contains Track numbers.

  35.  * Material Package contains tracks with reference to SourcePackage tracks.

  36.  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.

  37.  * Assign Descriptors to correct Tracks.

  38.  *

  39.  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

  42.  * Simple demuxer, only OP1A supported and some files might not work at all.

  43.  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "mxf.h"

  50. 

  51. typedef struct {

  52.     UID uid;

  53.     enum MXFMetadataSetType type;

  54.     UID source_container_ul;

  55. } MXFCryptoContext;

  56. 

  57. typedef struct {

  58.     UID uid;

  59.     enum MXFMetadataSetType type;

  60.     UID source_package_uid;

  61.     UID data_definition_ul;

  62.     int64_t duration;

  63.     int64_t start_position;

  64.     int source_track_id;

  65. } MXFStructuralComponent;

  66. 

  67. typedef struct {

  68.     UID uid;

  69.     enum MXFMetadataSetType type;

  70.     UID data_definition_ul;

  71.     UID *structural_components_refs;

  72.     int structural_components_count;

  73.     int64_t duration;

  74. } MXFSequence;

  75. 

  76. typedef struct {

  77.     UID uid;

  78.     enum MXFMetadataSetType type;

  79.     MXFSequence *sequence; /* mandatory, and only one */

  80.     UID sequence_ref;

  81.     int track_id;

  82.     uint8_t track_number[4];

  83.     AVRational edit_rate;

  84. } MXFTrack;

  85. 

  86. typedef struct {

  87.     UID uid;

  88.     enum MXFMetadataSetType type;

  89.     UID essence_container_ul;

  90.     UID essence_codec_ul;

  91.     AVRational sample_rate;

  92.     AVRational aspect_ratio;

  93.     int width;

  94.     int height;

  95.     int channels;

  96.     int bits_per_sample;

  97.     UID *sub_descriptors_refs;

  98.     int sub_descriptors_count;

  99.     int linked_track_id;

  100.     uint8_t *extradata;

  101.     int extradata_size;

  102. } MXFDescriptor;

  103. 

  104. typedef struct {

  105.     UID uid;

  106.     enum MXFMetadataSetType type;

  107. } MXFIndexTableSegment;

  108. 

  109. typedef struct {

  110.     UID uid;

  111.     enum MXFMetadataSetType type;

  112.     UID package_uid;

  113.     UID *tracks_refs;

  114.     int tracks_count;

  115.     MXFDescriptor *descriptor; /* only one */

  116.     UID descriptor_ref;

  117. } MXFPackage;

  118. 

  119. typedef struct {

  120.     UID uid;

  121.     enum MXFMetadataSetType type;

  122. } MXFMetadataSet;

  123. 

  124. typedef struct {

  125.     UID *packages_refs;

  126.     int packages_count;

  127.     MXFMetadataSet **metadata_sets;

  128.     int metadata_sets_count;

  129.     AVFormatContext *fc;

  130.     struct AVAES *aesc;

  131.     uint8_t *local_tags;

  132.     int local_tags_count;

  133. } MXFContext;

  134. 

  135. enum MXFWrappingScheme {

  136.     Frame,

  137.     Clip,

  138. };

  139. 

  140. typedef struct {

  141.     const UID key;

  142.     int (*read)();

  143.     int ctx_size;

  144.     enum MXFMetadataSetType type;

  145. } MXFMetadataReadTableEntry;

  146. 

  147. /* partial keys to match */

  148. static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };

  149. static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };

  150. static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };

  151. /* complete keys to match */

  152. 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 };

  153. static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };

  154. static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };

  155. static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };

  156. 

  157. #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))

  158. 

  159. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  160. {

  161.     uint64_t size = get_byte(pb);

  162.     if (size & 0x80) { /* long form */

  163.         int bytes_num = size & 0x7f;

  164.         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */

  165.         if (bytes_num > 8)

  166.             return -1;

  167.         size = 0;

  168.         while (bytes_num--)

  169.             size = size << 8 | get_byte(pb);

  170.     }

  171.     return size;

  172. }

  173. 

  174. static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)

  175. {

  176.     int i, b;

  177.     for (i = 0; i < size && !url_feof(pb); i++) {

  178.         b = get_byte(pb);

  179.         if (b == key[0])

  180.             i = 0;

  181.         else if (b != key[i])

  182.             i = -1;

  183.     }

  184.     return i == size;

  185. }

  186. 

  187. static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)

  188. {

  189.     if (!mxf_read_sync(pb, mxf_klv_key, 4))

  190.         return -1;

  191.     klv->offset = url_ftell(pb) - 4;

  192.     memcpy(klv->key, mxf_klv_key, 4);

  193.     get_buffer(pb, klv->key + 4, 12);

  194.     klv->length = klv_decode_ber_length(pb);

  195.     return klv->length == -1 ? -1 : 0;

  196. }

  197. 

  198. static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)

  199. {

  200.     int i;

  201. 

  202.     for (i = 0; i < s->nb_streams; i++) {

  203.         MXFTrack *track = s->streams[i]->priv_data;

  204.         /* SMPTE 379M 7.3 */

  205.         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))

  206.             return i;

  207.     }

  208.     /* return 0 if only one stream, for OP Atom files with 0 as track number */

  209.     return s->nb_streams == 1 ? 0 : -1;

  210. }

  211. 

  212. /* XXX: use AVBitStreamFilter */

  213. static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)

  214. {

  215.     uint8_t buffer[61444];

  216.     const uint8_t *buf_ptr, *end_ptr;

  217.     uint8_t *data_ptr;

  218.     int i;

  219. 

  220.     if (length > 61444) /* worst case PAL 1920 samples 8 channels */

  221.         return -1;

  222.     get_buffer(pb, buffer, length);

  223.     av_new_packet(pkt, length);

  224.     data_ptr = pkt->data;

  225.     end_ptr = buffer + length;

  226.     buf_ptr = buffer + 4; /* skip SMPTE 331M header */

  227.     for (; buf_ptr < end_ptr; ) {

  228.         for (i = 0; i < st->codec->channels; i++) {

  229.             uint32_t sample = bytestream_get_le32(&buf_ptr);

  230.             if (st->codec->bits_per_coded_sample == 24)

  231.                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);

  232.             else

  233.                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);

  234.         }

  235.         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M

  236.     }

  237.     pkt->size = data_ptr - pkt->data;

  238.     return 0;

  239. }

  240. 

  241. static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)

  242. {

  243.     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};

  244.     MXFContext *mxf = s->priv_data;

  245.     ByteIOContext *pb = s->pb;

  246.     int64_t end = url_ftell(pb) + klv->length;

  247.     uint64_t size;

  248.     uint64_t orig_size;

  249.     uint64_t plaintext_size;

  250.     uint8_t ivec[16];

  251.     uint8_t tmpbuf[16];

  252.     int index;

  253. 

  254.     if (!mxf->aesc && s->key && s->keylen == 16) {

  255.         mxf->aesc = av_malloc(av_aes_size);

  256.         if (!mxf->aesc)

  257.             return -1;

  258.         av_aes_init(mxf->aesc, s->key, 128, 1);

  259.     }

  260.     // crypto context

  261.     url_fskip(pb, klv_decode_ber_length(pb));

  262.     // plaintext offset

  263.     klv_decode_ber_length(pb);

  264.     plaintext_size = get_be64(pb);

  265.     // source klv key

  266.     klv_decode_ber_length(pb);

  267.     get_buffer(pb, klv->key, 16);

  268.     if (!IS_KLV_KEY(klv, mxf_essence_element_key))

  269.         return -1;

  270.     index = mxf_get_stream_index(s, klv);

  271.     if (index < 0)

  272.         return -1;

  273.     // source size

  274.     klv_decode_ber_length(pb);

  275.     orig_size = get_be64(pb);

  276.     if (orig_size < plaintext_size)

  277.         return -1;

  278.     // enc. code

  279.     size = klv_decode_ber_length(pb);

  280.     if (size < 32 || size - 32 < orig_size)

  281.         return -1;

  282.     get_buffer(pb, ivec, 16);

  283.     get_buffer(pb, tmpbuf, 16);

  284.     if (mxf->aesc)

  285.         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);

  286.     if (memcmp(tmpbuf, checkv, 16))

  287.         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");

  288.     size -= 32;

  289.     av_get_packet(pb, pkt, size);

  290.     size -= plaintext_size;

  291.     if (mxf->aesc)

  292.         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],

  293.                      &pkt->data[plaintext_size], size >> 4, ivec, 1);

  294.     pkt->size = orig_size;

  295.     pkt->stream_index = index;

  296.     url_fskip(pb, end - url_ftell(pb));

  297.     return 0;

  298. }

  299. 

  300. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  301. {

  302.     KLVPacket klv;

  303. 

  304.     while (!url_feof(s->pb)) {

  305.         if (klv_read_packet(&klv, s->pb) < 0)

  306.             return -1;

  307.         PRINT_KEY(s, "read packet", klv.key);

  308.         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);

  309.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  310.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  311.             if (res < 0) {

  312.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  313.                 return -1;

  314.             }

  315.             return 0;

  316.         }

  317.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  318.             int index = mxf_get_stream_index(s, &klv);

  319.             if (index < 0) {

  320.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  321.                 goto skip;

  322.             }

  323.             if (s->streams[index]->discard == AVDISCARD_ALL)

  324.                 goto skip;

  325.             /* check for 8 channels AES3 element */

  326.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  327.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  328.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  329.                     return -1;

  330.                 }

  331.             } else

  332.                 av_get_packet(s->pb, pkt, klv.length);

  333.             pkt->stream_index = index;

  334.             pkt->pos = klv.offset;

  335.             return 0;

  336.         } else

  337.         skip:

  338.             url_fskip(s->pb, klv.length);

  339.     }

  340.     return AVERROR(EIO);

  341. }

  342. 

  343. static int mxf_read_primer_pack(MXFContext *mxf)

  344. {

  345.     ByteIOContext *pb = mxf->fc->pb;

  346.     int item_num = get_be32(pb);

  347.     int item_len = get_be32(pb);

  348. 

  349.     if (item_len != 18) {

  350.         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");

  351.         return -1;

  352.     }

  353.     if (item_num > UINT_MAX / item_len)

  354.         return -1;

  355.     mxf->local_tags_count = item_num;

  356.     mxf->local_tags = av_malloc(item_num*item_len);

  357.     if (!mxf->local_tags)

  358.         return -1;

  359.     get_buffer(pb, mxf->local_tags, item_num*item_len);

  360.     return 0;

  361. }

  362. 

  363. static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)

  364. {

  365.     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));

  366.     if (!mxf->metadata_sets)

  367.         return -1;

  368.     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;

  369.     mxf->metadata_sets_count++;

  370.     return 0;

  371. }

  372. 

  373. static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)

  374. {

  375.     if (size != 16)

  376.         return -1;

  377.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

  378.         get_buffer(pb, cryptocontext->source_container_ul, 16);

  379.     return 0;

  380. }

  381. 

  382. static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)

  383. {

  384.     switch (tag) {

  385.     case 0x1901:

  386.         mxf->packages_count = get_be32(pb);

  387.         if (mxf->packages_count >= UINT_MAX / sizeof(UID))

  388.             return -1;

  389.         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));

  390.         if (!mxf->packages_refs)

  391.             return -1;

  392.         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  393.         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));

  394.         break;

  395.     }

  396.     return 0;

  397. }

  398. 

  399. static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)

  400. {

  401.     switch(tag) {

  402.     case 0x0202:

  403.         source_clip->duration = get_be64(pb);

  404.         break;

  405.     case 0x1201:

  406.         source_clip->start_position = get_be64(pb);

  407.         break;

  408.     case 0x1101:

  409.         /* UMID, only get last 16 bytes */

  410.         url_fskip(pb, 16);

  411.         get_buffer(pb, source_clip->source_package_uid, 16);

  412.         break;

  413.     case 0x1102:

  414.         source_clip->source_track_id = get_be32(pb);

  415.         break;

  416.     }

  417.     return 0;

  418. }

  419. 

  420. static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)

  421. {

  422.     switch(tag) {

  423.     case 0x4403:

  424.         package->tracks_count = get_be32(pb);

  425.         if (package->tracks_count >= UINT_MAX / sizeof(UID))

  426.             return -1;

  427.         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));

  428.         if (!package->tracks_refs)

  429.             return -1;

  430.         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  431.         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  432.         break;

  433.     }

  434.     return 0;

  435. }

  436. 

  437. static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)

  438. {

  439.     switch(tag) {

  440.     case 0x4801:

  441.         track->track_id = get_be32(pb);

  442.         break;

  443.     case 0x4804:

  444.         get_buffer(pb, track->track_number, 4);

  445.         break;

  446.     case 0x4B01:

  447.         track->edit_rate.den = get_be32(pb);

  448.         track->edit_rate.num = get_be32(pb);

  449.         break;

  450.     case 0x4803:

  451.         get_buffer(pb, track->sequence_ref, 16);

  452.         break;

  453.     }

  454.     return 0;

  455. }

  456. 

  457. static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)

  458. {

  459.     switch(tag) {

  460.     case 0x0202:

  461.         sequence->duration = get_be64(pb);

  462.         break;

  463.     case 0x0201:

  464.         get_buffer(pb, sequence->data_definition_ul, 16);

  465.         break;

  466.     case 0x1001:

  467.         sequence->structural_components_count = get_be32(pb);

  468.         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))

  469.             return -1;

  470.         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));

  471.         if (!sequence->structural_components_refs)

  472.             return -1;

  473.         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  474.         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));

  475.         break;

  476.     }

  477.     return 0;

  478. }

  479. 

  480. static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)

  481. {

  482.     switch(tag) {

  483.     case 0x4403:

  484.         package->tracks_count = get_be32(pb);

  485.         if (package->tracks_count >= UINT_MAX / sizeof(UID))

  486.             return -1;

  487.         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));

  488.         if (!package->tracks_refs)

  489.             return -1;

  490.         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  491.         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  492.         break;

  493.     case 0x4401:

  494.         /* UMID, only get last 16 bytes */

  495.         url_fskip(pb, 16);

  496.         get_buffer(pb, package->package_uid, 16);

  497.         break;

  498.     case 0x4701:

  499.         get_buffer(pb, package->descriptor_ref, 16);

  500.         break;

  501.     }

  502.     return 0;

  503. }

  504. 

  505. static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag)

  506. {

  507.     switch(tag) {

  508.     case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break;

  509.     case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break;

  510.     case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break;

  511.     case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break;

  512.     case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break;

  513.     case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break;

  514.     }

  515.     return 0;

  516. }

  517. 

  518. static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)

  519. {

  520.     int code;

  521. 

  522.     do {

  523.         code = get_byte(pb);

  524.         dprintf(NULL, "pixel layout: code %#x\n", code);

  525.         switch (code) {

  526.         case 0x52: /* R */

  527.             descriptor->bits_per_sample += get_byte(pb);

  528.             break;

  529.         case 0x47: /* G */

  530.             descriptor->bits_per_sample += get_byte(pb);

  531.             break;

  532.         case 0x42: /* B */

  533.             descriptor->bits_per_sample += get_byte(pb);

  534.             break;

  535.         default:

  536.             get_byte(pb);

  537.         }

  538.     } while (code != 0); /* SMPTE 377M E.2.46 */

  539. }

  540. 

  541. static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)

  542. {

  543.     switch(tag) {

  544.     case 0x3F01:

  545.         descriptor->sub_descriptors_count = get_be32(pb);

  546.         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))

  547.             return -1;

  548.         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));

  549.         if (!descriptor->sub_descriptors_refs)

  550.             return -1;

  551.         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */

  552.         get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));

  553.         break;

  554.     case 0x3004:

  555.         get_buffer(pb, descriptor->essence_container_ul, 16);

  556.         break;

  557.     case 0x3006:

  558.         descriptor->linked_track_id = get_be32(pb);

  559.         break;

  560.     case 0x3201: /* PictureEssenceCoding */

  561.         get_buffer(pb, descriptor->essence_codec_ul, 16);

  562.         break;

  563.     case 0x3203:

  564.         descriptor->width = get_be32(pb);

  565.         break;

  566.     case 0x3202:

  567.         descriptor->height = get_be32(pb);

  568.         break;

  569.     case 0x320E:

  570.         descriptor->aspect_ratio.num = get_be32(pb);

  571.         descriptor->aspect_ratio.den = get_be32(pb);

  572.         break;

  573.     case 0x3D03:

  574.         descriptor->sample_rate.num = get_be32(pb);

  575.         descriptor->sample_rate.den = get_be32(pb);

  576.         break;

  577.     case 0x3D06: /* SoundEssenceCompression */

  578.         get_buffer(pb, descriptor->essence_codec_ul, 16);

  579.         break;

  580.     case 0x3D07:

  581.         descriptor->channels = get_be32(pb);

  582.         break;

  583.     case 0x3D01:

  584.         descriptor->bits_per_sample = get_be32(pb);

  585.         break;

  586.     case 0x3401:

  587.         mxf_read_pixel_layout(pb, descriptor);

  588.         break;

  589.     default:

  590.         /* Private uid used by SONY C0023S01.mxf */

  591.         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {

  592.             descriptor->extradata = av_malloc(size);

  593.             if (!descriptor->extradata)

  594.                 return -1;

  595.             descriptor->extradata_size = size;

  596.             get_buffer(pb, descriptor->extradata, size);

  597.         }

  598.         break;

  599.     }

  600.     return 0;

  601. }

  602. 

  603. /*

  604.  * Match an uid independently of the version byte and up to len common bytes

  605.  * Returns: boolean

  606.  */

  607. static int mxf_match_uid(const UID key, const UID uid, int len)

  608. {

  609.     int i;

  610.     for (i = 0; i < len; i++) {

  611.         if (i != 7 && key[i] != uid[i])

  612.             return 0;

  613.     }

  614.     return 1;

  615. }

  616. 

  617. static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)

  618. {

  619.     while (uls->id != CODEC_ID_NONE) {

  620.         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))

  621.             break;

  622.         uls++;

  623.     }

  624.     return uls;

  625. }

  626. 

  627. static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)

  628. {

  629.     while (uls->type != CODEC_TYPE_DATA) {

  630.         if(mxf_match_uid(uls->uid, *uid, 16))

  631.             break;

  632.         uls++;

  633.     }

  634.     return uls->type;

  635. }

  636. 

  637. static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)

  638. {

  639.     int i;

  640. 

  641.     if (!strong_ref)

  642.         return NULL;

  643.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  644.         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&

  645.             (type == AnyType || mxf->metadata_sets[i]->type == type)) {

  646.             return mxf->metadata_sets[i];

  647.         }

  648.     }

  649.     return NULL;

  650. }

  651. 

  652. static const MXFCodecUL mxf_essence_container_uls[] = {

  653.     // video essence container uls

  654.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  655.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  656.     // sound essence container uls

  657.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  658.     { { 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 */

  659.     { { 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 */

  660.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  661. };

  662. 

  663. static int mxf_parse_structural_metadata(MXFContext *mxf)

  664. {

  665.     MXFPackage *material_package = NULL;

  666.     MXFPackage *temp_package = NULL;

  667.     int i, j, k;

  668. 

  669.     dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  670.     /* TODO: handle multiple material packages (OP3x) */

  671.     for (i = 0; i < mxf->packages_count; i++) {

  672.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  673.         if (material_package) break;

  674.     }

  675.     if (!material_package) {

  676.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  677.         return -1;

  678.     }

  679. 

  680.     for (i = 0; i < material_package->tracks_count; i++) {

  681.         MXFPackage *source_package = NULL;

  682.         MXFTrack *material_track = NULL;

  683.         MXFTrack *source_track = NULL;

  684.         MXFTrack *temp_track = NULL;

  685.         MXFDescriptor *descriptor = NULL;

  686.         MXFStructuralComponent *component = NULL;

  687.         UID *essence_container_ul = NULL;

  688.         const MXFCodecUL *codec_ul = NULL;

  689.         const MXFCodecUL *container_ul = NULL;

  690.         AVStream *st;

  691. 

  692.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  693.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  694.             continue;

  695.         }

  696. 

  697.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  698.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  699.             return -1;

  700.         }

  701. 

  702.         /* TODO: handle multiple source clips */

  703.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  704.             /* TODO: handle timecode component */

  705.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  706.             if (!component)

  707.                 continue;

  708. 

  709.             for (k = 0; k < mxf->packages_count; k++) {

  710.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  711.                 if (!temp_package)

  712.                     continue;

  713.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  714.                     source_package = temp_package;

  715.                     break;

  716.                 }

  717.             }

  718.             if (!source_package) {

  719.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);

  720.                 break;

  721.             }

  722.             for (k = 0; k < source_package->tracks_count; k++) {

  723.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  724.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  725.                     return -1;

  726.                 }

  727.                 if (temp_track->track_id == component->source_track_id) {

  728.                     source_track = temp_track;

  729.                     break;

  730.                 }

  731.             }

  732.             if (!source_track) {

  733.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  734.                 break;

  735.             }

  736.         }

  737.         if (!source_track)

  738.             continue;

  739. 

  740.         st = av_new_stream(mxf->fc, source_track->track_id);

  741.         if (!st) {

  742.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  743.             return -1;

  744.         }

  745.         st->priv_data = source_track;

  746.         st->duration = component->duration;

  747.         if (st->duration == -1)

  748.             st->duration = AV_NOPTS_VALUE;

  749.         st->start_time = component->start_position;

  750.         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  751. 

  752.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  753.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  754.             return -1;

  755.         }

  756. 

  757.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  758.         st->codec->codec_type = mxf_get_codec_type(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  759. 

  760.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  761.         if (source_package->descriptor) {

  762.             if (source_package->descriptor->type == MultipleDescriptor) {

  763.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  764.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  765. 

  766.                     if (!sub_descriptor) {

  767.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  768.                         continue;

  769.                     }

  770.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  771.                         descriptor = sub_descriptor;

  772.                         break;

  773.                     }

  774.                 }

  775.             } else if (source_package->descriptor->type == Descriptor)

  776.                 descriptor = source_package->descriptor;

  777.         }

  778.         if (!descriptor) {

  779.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  780.             continue;

  781.         }

  782.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  783.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  784.         essence_container_ul = &descriptor->essence_container_ul;

  785.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  786.          * is not allowed according to s429-6, try to find correct information anyway */

  787.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  788.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  789.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  790.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  791.                 if (metadata->type == CryptoContext) {

  792.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  793.                     break;

  794.                 }

  795.             }

  796.         }

  797.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  798.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  799.         st->codec->codec_id = codec_ul->id;

  800.         if (descriptor->extradata) {

  801.             st->codec->extradata = descriptor->extradata;

  802.             st->codec->extradata_size = descriptor->extradata_size;

  803.         }

  804.         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

  805.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  806.             if (st->codec->codec_id == CODEC_ID_NONE)

  807.                 st->codec->codec_id = container_ul->id;

  808.             st->codec->width = descriptor->width;

  809.             st->codec->height = descriptor->height;

  810.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */

  811.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  812.         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

  813.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  814.             if (st->codec->codec_id == CODEC_ID_NONE)

  815.                 st->codec->codec_id = container_ul->id;

  816.             st->codec->channels = descriptor->channels;

  817.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  818.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  819.             /* TODO: implement CODEC_ID_RAWAUDIO */

  820.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  821.                 if (descriptor->bits_per_sample == 24)

  822.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  823.                 else if (descriptor->bits_per_sample == 32)

  824.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  825.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  826.                 if (descriptor->bits_per_sample == 24)

  827.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  828.                 else if (descriptor->bits_per_sample == 32)

  829.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  830.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  831.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  832.             }

  833.         }

  834.         if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  835.             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");

  836.             st->need_parsing = AVSTREAM_PARSE_FULL;

  837.         }

  838.     }

  839.     return 0;

  840. }

  841. 

  842. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  843.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  844.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  845.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  846.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  847.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  848.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  849.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  850.     { { 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 */

  851.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  852.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  853.     { { 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 */

  854.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  855.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  856.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  857.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  858.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  859.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  860.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  861. };

  862. 

  863. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)

  864. {

  865.     ByteIOContext *pb = mxf->fc->pb;

  866.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  867.     uint64_t klv_end = url_ftell(pb) + klv->length;

  868. 

  869.     if (!ctx)

  870.         return -1;

  871.     while (url_ftell(pb) + 4 < klv_end) {

  872.         int tag = get_be16(pb);

  873.         int size = get_be16(pb); /* KLV specified by 0x53 */

  874.         uint64_t next = url_ftell(pb) + size;

  875.         UID uid = {0};

  876. 

  877.         dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size);

  878.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  879.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  880.             continue;

  881.         }

  882.         if (tag > 0x7FFF) { /* dynamic tag */

  883.             int i;

  884.             for (i = 0; i < mxf->local_tags_count; i++) {

  885.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  886.                 if (local_tag == tag) {

  887.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  888.                     dprintf(mxf->fc, "local tag %#04x\n", local_tag);

  889.                     PRINT_KEY(mxf->fc, "uid", uid);

  890.                 }

  891.             }

  892.         }

  893.         if (ctx_size && tag == 0x3C0A)

  894.             get_buffer(pb, ctx->uid, 16);

  895.         else if (read_child(ctx, pb, tag, size, uid) < 0)

  896.             return -1;

  897. 

  898.         url_fseek(pb, next, SEEK_SET);

  899.     }

  900.     if (ctx_size) ctx->type = type;

  901.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  902. }

  903. 

  904. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  905. {

  906.     MXFContext *mxf = s->priv_data;

  907.     KLVPacket klv;

  908. 

  909.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  910.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  911.         return -1;

  912.     }

  913.     url_fseek(s->pb, -14, SEEK_CUR);

  914.     mxf->fc = s;

  915.     while (!url_feof(s->pb)) {

  916.         const MXFMetadataReadTableEntry *metadata;

  917. 

  918.         if (klv_read_packet(&klv, s->pb) < 0)

  919.             return -1;

  920.         PRINT_KEY(s, "read header", klv.key);

  921.         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);

  922.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  923.             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  924.             /* FIXME avoid seek */

  925.             url_fseek(s->pb, klv.offset, SEEK_SET);

  926.             break;

  927.         }

  928. 

  929.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  930.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  931.                 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;

  932.                 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {

  933.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  934.                     return -1;

  935.                 }

  936.                 break;

  937.             }

  938.         }

  939.         if (!metadata->read)

  940.             url_fskip(s->pb, klv.length);

  941.     }

  942.     return mxf_parse_structural_metadata(mxf);

  943. }

  944. 

  945. static int mxf_read_close(AVFormatContext *s)

  946. {

  947.     MXFContext *mxf = s->priv_data;

  948.     int i;

  949. 

  950.     av_freep(&mxf->packages_refs);

  951.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  952.         switch (mxf->metadata_sets[i]->type) {

  953.         case MultipleDescriptor:

  954.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  955.             break;

  956.         case Sequence:

  957.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  958.             break;

  959.         case SourcePackage:

  960.         case MaterialPackage:

  961.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  962.             break;

  963.         case Track:

  964.             mxf->metadata_sets[i] = NULL; /* will be freed later */

  965.             break;

  966.         default:

  967.             break;

  968.         }

  969.         av_freep(&mxf->metadata_sets[i]);

  970.     }

  971.     av_freep(&mxf->metadata_sets);

  972.     av_freep(&mxf->aesc);

  973.     av_freep(&mxf->local_tags);

  974.     return 0;

  975. }

  976. 

  977. static int mxf_probe(AVProbeData *p) {

  978.     uint8_t *bufp = p->buf;

  979.     uint8_t *end = p->buf + p->buf_size;

  980. 

  981.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  982.         return 0;

  983. 

  984.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  985.     end -= sizeof(mxf_header_partition_pack_key);

  986.     for (; bufp < end; bufp++) {

  987.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  988.             return AVPROBE_SCORE_MAX;

  989.     }

  990.     return 0;

  991. }

  992. 

  993. /* rudimentary byte seek */

  994. /* XXX: use MXF Index */

  995. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  996. {

  997.     AVStream *st = s->streams[stream_index];

  998.     int64_t seconds;

  999. 

  1000.     if (!s->bit_rate)

  1001.         return -1;

  1002.     if (sample_time < 0)

  1003.         sample_time = 0;

  1004.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1005.     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1006.     av_update_cur_dts(s, st, sample_time);

  1007.     return 0;

  1008. }

  1009. 

  1010. AVInputFormat mxf_demuxer = {

  1011.     "mxf",

  1012.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1013.     sizeof(MXFContext),

  1014.     mxf_probe,

  1015.     mxf_read_header,

  1016.     mxf_read_packet,

  1017.     mxf_read_close,

  1018.     mxf_read_seek,

  1019. };