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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 "libavcodec/bytestream.h"

  50. #include "avformat.h"

  51. #include "mxf.h"

  52. 

  53. typedef struct {

  54.     UID uid;

  55.     enum MXFMetadataSetType type;

  56.     UID source_container_ul;

  57. } MXFCryptoContext;

  58. 

  59. typedef struct {

  60.     UID uid;

  61.     enum MXFMetadataSetType type;

  62.     UID source_package_uid;

  63.     UID data_definition_ul;

  64.     int64_t duration;

  65.     int64_t start_position;

  66.     int source_track_id;

  67. } MXFStructuralComponent;

  68. 

  69. typedef struct {

  70.     UID uid;

  71.     enum MXFMetadataSetType type;

  72.     UID data_definition_ul;

  73.     UID *structural_components_refs;

  74.     int structural_components_count;

  75.     int64_t duration;

  76. } MXFSequence;

  77. 

  78. typedef struct {

  79.     UID uid;

  80.     enum MXFMetadataSetType type;

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

  82.     UID sequence_ref;

  83.     int track_id;

  84.     uint8_t track_number[4];

  85.     AVRational edit_rate;

  86. } MXFTrack;

  87. 

  88. typedef struct {

  89.     UID uid;

  90.     enum MXFMetadataSetType type;

  91.     UID essence_container_ul;

  92.     UID essence_codec_ul;

  93.     AVRational sample_rate;

  94.     AVRational aspect_ratio;

  95.     int width;

  96.     int height;

  97.     int channels;

  98.     int bits_per_sample;

  99.     UID *sub_descriptors_refs;

  100.     int sub_descriptors_count;

  101.     int linked_track_id;

  102.     uint8_t *extradata;

  103.     int extradata_size;

  104. } MXFDescriptor;

  105. 

  106. typedef struct {

  107.     UID uid;

  108.     enum MXFMetadataSetType type;

  109. } MXFIndexTableSegment;

  110. 

  111. typedef struct {

  112.     UID uid;

  113.     enum MXFMetadataSetType type;

  114.     UID package_uid;

  115.     UID *tracks_refs;

  116.     int tracks_count;

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

  118.     UID descriptor_ref;

  119. } MXFPackage;

  120. 

  121. typedef struct {

  122.     UID uid;

  123.     enum MXFMetadataSetType type;

  124. } MXFMetadataSet;

  125. 

  126. typedef struct {

  127.     UID *packages_refs;

  128.     int packages_count;

  129.     MXFMetadataSet **metadata_sets;

  130.     int metadata_sets_count;

  131.     AVFormatContext *fc;

  132.     struct AVAES *aesc;

  133.     uint8_t *local_tags;

  134.     int local_tags_count;

  135. } MXFContext;

  136. 

  137. enum MXFWrappingScheme {

  138.     Frame,

  139.     Clip,

  140. };

  141. 

  142. typedef struct {

  143.     const UID key;

  144.     int (*read)();

  145.     int ctx_size;

  146.     enum MXFMetadataSetType type;

  147. } MXFMetadataReadTableEntry;

  148. 

  149. /* partial keys to match */

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

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

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

  153. /* complete keys to match */

  154. 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 };

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

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

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

  158. 

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

  160. 

  161. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  162. {

  163.     uint64_t size = get_byte(pb);

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

  165.         int bytes_num = size & 0x7f;

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

  167.         if (bytes_num > 8)

  168.             return -1;

  169.         size = 0;

  170.         while (bytes_num--)

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

  172.     }

  173.     return size;

  174. }

  175. 

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

  177. {

  178.     int i, b;

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

  180.         b = get_byte(pb);

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

  182.             i = 0;

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

  184.             i = -1;

  185.     }

  186.     return i == size;

  187. }

  188. 

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

  190. {

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

  192.         return -1;

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

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

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

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

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

  198. }

  199. 

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

  201. {

  202.     int i;

  203. 

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

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

  206.         /* SMPTE 379M 7.3 */

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

  208.             return i;

  209.     }

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

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

  212. }

  213. 

  214. /* XXX: use AVBitStreamFilter */

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

  216. {

  217.     const uint8_t *buf_ptr, *end_ptr;

  218.     uint8_t *data_ptr;

  219.     int i;

  220. 

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

  222.         return -1;

  223.     av_new_packet(pkt, length);

  224.     get_buffer(pb, pkt->data, length);

  225.     data_ptr = pkt->data;

  226.     end_ptr = pkt->data + length;

  227.     buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */

  228.     for (; buf_ptr < end_ptr; ) {

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

  230.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  233.             else

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

  235.         }

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

  237.     }

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

  239.     return 0;

  240. }

  241. 

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

  243. {

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

  245.     MXFContext *mxf = s->priv_data;

  246.     ByteIOContext *pb = s->pb;

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

  248.     uint64_t size;

  249.     uint64_t orig_size;

  250.     uint64_t plaintext_size;

  251.     uint8_t ivec[16];

  252.     uint8_t tmpbuf[16];

  253.     int index;

  254. 

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

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

  257.         if (!mxf->aesc)

  258.             return -1;

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

  260.     }

  261.     // crypto context

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

  263.     // plaintext offset

  264.     klv_decode_ber_length(pb);

  265.     plaintext_size = get_be64(pb);

  266.     // source klv key

  267.     klv_decode_ber_length(pb);

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

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

  270.         return -1;

  271.     index = mxf_get_stream_index(s, klv);

  272.     if (index < 0)

  273.         return -1;

  274.     // source size

  275.     klv_decode_ber_length(pb);

  276.     orig_size = get_be64(pb);

  277.     if (orig_size < plaintext_size)

  278.         return -1;

  279.     // enc. code

  280.     size = klv_decode_ber_length(pb);

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

  282.         return -1;

  283.     get_buffer(pb, ivec, 16);

  284.     get_buffer(pb, tmpbuf, 16);

  285.     if (mxf->aesc)

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

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

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

  289.     size -= 32;

  290.     av_get_packet(pb, pkt, size);

  291.     size -= plaintext_size;

  292.     if (mxf->aesc)

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

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

  295.     pkt->size = orig_size;

  296.     pkt->stream_index = index;

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

  298.     return 0;

  299. }

  300. 

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

  302. {

  303.     KLVPacket klv;

  304. 

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

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

  307.             return -1;

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

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

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

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

  312.             if (res < 0) {

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

  314.                 return -1;

  315.             }

  316.             return 0;

  317.         }

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

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

  320.             if (index < 0) {

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

  322.                 goto skip;

  323.             }

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

  325.                 goto skip;

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

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

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

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

  330.                     return -1;

  331.                 }

  332.             } else

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

  334.             pkt->stream_index = index;

  335.             pkt->pos = klv.offset;

  336.             return 0;

  337.         } else

  338.         skip:

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

  340.     }

  341.     return AVERROR_EOF;

  342. }

  343. 

  344. static int mxf_read_primer_pack(MXFContext *mxf)

  345. {

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

  347.     int item_num = get_be32(pb);

  348.     int item_len = get_be32(pb);

  349. 

  350.     if (item_len != 18) {

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

  352.         return -1;

  353.     }

  354.     if (item_num > UINT_MAX / item_len)

  355.         return -1;

  356.     mxf->local_tags_count = item_num;

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

  358.     if (!mxf->local_tags)

  359.         return -1;

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

  361.     return 0;

  362. }

  363. 

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

  365. {

  366.     if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets))

  367.         return AVERROR(ENOMEM);

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

  369.     if (!mxf->metadata_sets)

  370.         return -1;

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

  372.     mxf->metadata_sets_count++;

  373.     return 0;

  374. }

  375. 

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

  377. {

  378.     if (size != 16)

  379.         return -1;

  380.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  382.     return 0;

  383. }

  384. 

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

  386. {

  387.     switch (tag) {

  388.     case 0x1901:

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

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

  391.             return -1;

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

  393.         if (!mxf->packages_refs)

  394.             return -1;

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

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

  397.         break;

  398.     }

  399.     return 0;

  400. }

  401. 

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

  403. {

  404.     switch(tag) {

  405.     case 0x0202:

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

  407.         break;

  408.     case 0x1201:

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

  410.         break;

  411.     case 0x1101:

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

  413.         url_fskip(pb, 16);

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

  415.         break;

  416.     case 0x1102:

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

  418.         break;

  419.     }

  420.     return 0;

  421. }

  422. 

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

  424. {

  425.     switch(tag) {

  426.     case 0x4403:

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

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

  429.             return -1;

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

  431.         if (!package->tracks_refs)

  432.             return -1;

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

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

  435.         break;

  436.     }

  437.     return 0;

  438. }

  439. 

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

  441. {

  442.     switch(tag) {

  443.     case 0x4801:

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

  445.         break;

  446.     case 0x4804:

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

  448.         break;

  449.     case 0x4B01:

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

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

  452.         break;

  453.     case 0x4803:

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

  455.         break;

  456.     }

  457.     return 0;

  458. }

  459. 

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

  461. {

  462.     switch(tag) {

  463.     case 0x0202:

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

  465.         break;

  466.     case 0x0201:

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

  468.         break;

  469.     case 0x1001:

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

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

  472.             return -1;

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

  474.         if (!sequence->structural_components_refs)

  475.             return -1;

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

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

  478.         break;

  479.     }

  480.     return 0;

  481. }

  482. 

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

  484. {

  485.     switch(tag) {

  486.     case 0x4403:

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

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

  489.             return -1;

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

  491.         if (!package->tracks_refs)

  492.             return -1;

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

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

  495.         break;

  496.     case 0x4401:

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

  498.         url_fskip(pb, 16);

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

  500.         break;

  501.     case 0x4701:

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

  503.         break;

  504.     }

  505.     return 0;

  506. }

  507. 

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

  509. {

  510.     switch(tag) {

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

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

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

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

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

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

  517.     }

  518.     return 0;

  519. }

  520. 

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

  522. {

  523.     int code;

  524. 

  525.     do {

  526.         code = get_byte(pb);

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

  528.         switch (code) {

  529.         case 0x52: /* R */

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

  531.             break;

  532.         case 0x47: /* G */

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

  534.             break;

  535.         case 0x42: /* B */

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

  537.             break;

  538.         default:

  539.             get_byte(pb);

  540.         }

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

  542. }

  543. 

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

  545. {

  546.     switch(tag) {

  547.     case 0x3F01:

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

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

  550.             return -1;

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

  552.         if (!descriptor->sub_descriptors_refs)

  553.             return -1;

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

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

  556.         break;

  557.     case 0x3004:

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

  559.         break;

  560.     case 0x3006:

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

  562.         break;

  563.     case 0x3201: /* PictureEssenceCoding */

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

  565.         break;

  566.     case 0x3203:

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

  568.         break;

  569.     case 0x3202:

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

  571.         break;

  572.     case 0x320E:

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

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

  575.         break;

  576.     case 0x3D03:

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

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

  579.         break;

  580.     case 0x3D06: /* SoundEssenceCompression */

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

  582.         break;

  583.     case 0x3D07:

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

  585.         break;

  586.     case 0x3D01:

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

  588.         break;

  589.     case 0x3401:

  590.         mxf_read_pixel_layout(pb, descriptor);

  591.         break;

  592.     default:

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

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

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

  596.             if (!descriptor->extradata)

  597.                 return -1;

  598.             descriptor->extradata_size = size;

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

  600.         }

  601.         break;

  602.     }

  603.     return 0;

  604. }

  605. 

  606. /*

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

  608.  * Returns: boolean

  609.  */

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

  611. {

  612.     int i;

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

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

  615.             return 0;

  616.     }

  617.     return 1;

  618. }

  619. 

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

  621. {

  622.     while (uls->uid[0]) {

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

  624.             break;

  625.         uls++;

  626.     }

  627.     return uls;

  628. }

  629. 

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

  631. {

  632.     int i;

  633. 

  634.     if (!strong_ref)

  635.         return NULL;

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

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

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

  639.             return mxf->metadata_sets[i];

  640.         }

  641.     }

  642.     return NULL;

  643. }

  644. 

  645. static const MXFCodecUL mxf_essence_container_uls[] = {

  646.     // video essence container uls

  647.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  648.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  649.     // sound essence container uls

  650.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  651.     { { 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 */

  652.     { { 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 */

  653.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  654. };

  655. 

  656. static int mxf_parse_structural_metadata(MXFContext *mxf)

  657. {

  658.     MXFPackage *material_package = NULL;

  659.     MXFPackage *temp_package = NULL;

  660.     int i, j, k;

  661. 

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

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

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

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

  666.         if (material_package) break;

  667.     }

  668.     if (!material_package) {

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

  670.         return -1;

  671.     }

  672. 

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

  674.         MXFPackage *source_package = NULL;

  675.         MXFTrack *material_track = NULL;

  676.         MXFTrack *source_track = NULL;

  677.         MXFTrack *temp_track = NULL;

  678.         MXFDescriptor *descriptor = NULL;

  679.         MXFStructuralComponent *component = NULL;

  680.         UID *essence_container_ul = NULL;

  681.         const MXFCodecUL *codec_ul = NULL;

  682.         const MXFCodecUL *container_ul = NULL;

  683.         AVStream *st;

  684. 

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

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

  687.             continue;

  688.         }

  689. 

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

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

  692.             continue;

  693.         }

  694. 

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

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

  697.             /* TODO: handle timecode component */

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

  699.             if (!component)

  700.                 continue;

  701. 

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

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

  704.                 if (!temp_package)

  705.                     continue;

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

  707.                     source_package = temp_package;

  708.                     break;

  709.                 }

  710.             }

  711.             if (!source_package) {

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

  713.                 break;

  714.             }

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

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

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

  718.                     return -1;

  719.                 }

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

  721.                     source_track = temp_track;

  722.                     break;

  723.                 }

  724.             }

  725.             if (!source_track) {

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

  727.                 break;

  728.             }

  729.         }

  730.         if (!source_track)

  731.             continue;

  732. 

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

  734.         if (!st) {

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

  736.             return -1;

  737.         }

  738.         st->priv_data = source_track;

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

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

  741.             st->duration = AV_NOPTS_VALUE;

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

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

  744. 

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

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

  747.             return -1;

  748.         }

  749. 

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

  751.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  752.         st->codec->codec_type = codec_ul->id;

  753. 

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

  755.         if (source_package->descriptor) {

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

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

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

  759. 

  760.                     if (!sub_descriptor) {

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

  762.                         continue;

  763.                     }

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

  765.                         descriptor = sub_descriptor;

  766.                         break;

  767.                     }

  768.                 }

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

  770.                 descriptor = source_package->descriptor;

  771.         }

  772.         if (!descriptor) {

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

  774.             continue;

  775.         }

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

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

  778.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  787.                     break;

  788.                 }

  789.             }

  790.         }

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

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

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

  794.         if (descriptor->extradata) {

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

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

  797.         }

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

  799.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  805.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  807.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  813.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  825.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  826.             }

  827.         }

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

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

  830.             st->need_parsing = AVSTREAM_PARSE_FULL;

  831.         }

  832.     }

  833.     return 0;

  834. }

  835. 

  836. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  837.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  838.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  839.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  840.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  841.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  842.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  843.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  844.     { { 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 */

  845.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  846.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  847.     { { 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 */

  848.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  849.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  850.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  851.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  852.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  853.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  854.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  855. };

  856. 

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

  858. {

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

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

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

  862. 

  863.     if (!ctx)

  864.         return -1;

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

  866.         int tag = get_be16(pb);

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

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

  869.         UID uid = {0};

  870. 

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

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

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

  874.             continue;

  875.         }

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

  877.             int i;

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

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

  880.                 if (local_tag == tag) {

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

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

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

  884.                 }

  885.             }

  886.         }

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

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

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

  890.             return -1;

  891. 

  892.         url_fseek(pb, next, SEEK_SET);

  893.     }

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

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

  896. }

  897. 

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

  899. {

  900.     MXFContext *mxf = s->priv_data;

  901.     KLVPacket klv;

  902. 

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

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

  905.         return -1;

  906.     }

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

  908.     mxf->fc = s;

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

  910.         const MXFMetadataReadTableEntry *metadata;

  911. 

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

  913.             return -1;

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

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

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

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

  918.             /* FIXME avoid seek */

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

  920.             break;

  921.         }

  922. 

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

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

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

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

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

  928.                     return -1;

  929.                 }

  930.                 break;

  931.             }

  932.         }

  933.         if (!metadata->read)

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

  935.     }

  936.     return mxf_parse_structural_metadata(mxf);

  937. }

  938. 

  939. static int mxf_read_close(AVFormatContext *s)

  940. {

  941.     MXFContext *mxf = s->priv_data;

  942.     int i;

  943. 

  944.     av_freep(&mxf->packages_refs);

  945. 

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

  947.         s->streams[i]->priv_data = NULL;

  948. 

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

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

  951.         case MultipleDescriptor:

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

  953.             break;

  954.         case Sequence:

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

  956.             break;

  957.         case SourcePackage:

  958.         case MaterialPackage:

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

  960.             break;

  961.         default:

  962.             break;

  963.         }

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

  965.     }

  966.     av_freep(&mxf->metadata_sets);

  967.     av_freep(&mxf->aesc);

  968.     av_freep(&mxf->local_tags);

  969.     return 0;

  970. }

  971. 

  972. static int mxf_probe(AVProbeData *p) {

  973.     uint8_t *bufp = p->buf;

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

  975. 

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

  977.         return 0;

  978. 

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

  980.     end -= sizeof(mxf_header_partition_pack_key);

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

  982.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  983.             return AVPROBE_SCORE_MAX;

  984.     }

  985.     return 0;

  986. }

  987. 

  988. /* rudimentary byte seek */

  989. /* XXX: use MXF Index */

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

  991. {

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

  993.     int64_t seconds;

  994. 

  995.     if (!s->bit_rate)

  996.         return -1;

  997.     if (sample_time < 0)

  998.         sample_time = 0;

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

  1000.     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1001.     av_update_cur_dts(s, st, sample_time);

  1002.     return 0;

  1003. }

  1004. 

  1005. AVInputFormat mxf_demuxer = {

  1006.     "mxf",

  1007.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1008.     sizeof(MXFContext),

  1009.     mxf_probe,

  1010.     mxf_read_header,

  1011.     mxf_read_packet,

  1012.     mxf_read_close,

  1013.     mxf_read_seek,

  1014. };