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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.     enum PixelFormat pix_fmt;

  105. } MXFDescriptor;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110. } MXFIndexTableSegment;

  111. 

  112. typedef struct {

  113.     UID uid;

  114.     enum MXFMetadataSetType type;

  115.     UID package_uid;

  116.     UID *tracks_refs;

  117.     int tracks_count;

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

  119.     UID descriptor_ref;

  120. } MXFPackage;

  121. 

  122. typedef struct {

  123.     UID uid;

  124.     enum MXFMetadataSetType type;

  125. } MXFMetadataSet;

  126. 

  127. typedef struct {

  128.     UID *packages_refs;

  129.     int packages_count;

  130.     MXFMetadataSet **metadata_sets;

  131.     int metadata_sets_count;

  132.     AVFormatContext *fc;

  133.     struct AVAES *aesc;

  134.     uint8_t *local_tags;

  135.     int local_tags_count;

  136. } MXFContext;

  137. 

  138. enum MXFWrappingScheme {

  139.     Frame,

  140.     Clip,

  141. };

  142. 

  143. typedef struct {

  144.     const UID key;

  145.     int (*read)();

  146.     int ctx_size;

  147.     enum MXFMetadataSetType type;

  148. } MXFMetadataReadTableEntry;

  149. 

  150. /* partial keys to match */

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

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

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

  154. /* complete keys to match */

  155. 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 };

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

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

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

  159. 

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

  161. 

  162. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  163. {

  164.     uint64_t size = get_byte(pb);

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

  166.         int bytes_num = size & 0x7f;

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

  168.         if (bytes_num > 8)

  169.             return -1;

  170.         size = 0;

  171.         while (bytes_num--)

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

  173.     }

  174.     return size;

  175. }

  176. 

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

  178. {

  179.     int i, b;

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

  181.         b = get_byte(pb);

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

  183.             i = 0;

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

  185.             i = -1;

  186.     }

  187.     return i == size;

  188. }

  189. 

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

  191. {

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

  193.         return -1;

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

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

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

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

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

  199. }

  200. 

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

  202. {

  203.     int i;

  204. 

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

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

  207.         /* SMPTE 379M 7.3 */

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

  209.             return i;

  210.     }

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

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

  213. }

  214. 

  215. /* XXX: use AVBitStreamFilter */

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

  217. {

  218.     const uint8_t *buf_ptr, *end_ptr;

  219.     uint8_t *data_ptr;

  220.     int i;

  221. 

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

  223.         return -1;

  224.     av_new_packet(pkt, length);

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

  226.     data_ptr = pkt->data;

  227.     end_ptr = pkt->data + length;

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

  229.     for (; buf_ptr < end_ptr; ) {

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

  231.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  234.             else

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

  236.         }

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

  238.     }

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

  240.     return 0;

  241. }

  242. 

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

  244. {

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

  246.     MXFContext *mxf = s->priv_data;

  247.     ByteIOContext *pb = s->pb;

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

  249.     uint64_t size;

  250.     uint64_t orig_size;

  251.     uint64_t plaintext_size;

  252.     uint8_t ivec[16];

  253.     uint8_t tmpbuf[16];

  254.     int index;

  255. 

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

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

  258.         if (!mxf->aesc)

  259.             return -1;

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

  261.     }

  262.     // crypto context

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

  264.     // plaintext offset

  265.     klv_decode_ber_length(pb);

  266.     plaintext_size = get_be64(pb);

  267.     // source klv key

  268.     klv_decode_ber_length(pb);

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

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

  271.         return -1;

  272.     index = mxf_get_stream_index(s, klv);

  273.     if (index < 0)

  274.         return -1;

  275.     // source size

  276.     klv_decode_ber_length(pb);

  277.     orig_size = get_be64(pb);

  278.     if (orig_size < plaintext_size)

  279.         return -1;

  280.     // enc. code

  281.     size = klv_decode_ber_length(pb);

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

  283.         return -1;

  284.     get_buffer(pb, ivec, 16);

  285.     get_buffer(pb, tmpbuf, 16);

  286.     if (mxf->aesc)

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

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

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

  290.     size -= 32;

  291.     av_get_packet(pb, pkt, size);

  292.     size -= plaintext_size;

  293.     if (mxf->aesc)

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

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

  296.     pkt->size = orig_size;

  297.     pkt->stream_index = index;

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

  299.     return 0;

  300. }

  301. 

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

  303. {

  304.     KLVPacket klv;

  305. 

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

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

  308.             return -1;

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

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

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

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

  313.             if (res < 0) {

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

  315.                 return -1;

  316.             }

  317.             return 0;

  318.         }

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

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

  321.             if (index < 0) {

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

  323.                 goto skip;

  324.             }

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

  326.                 goto skip;

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

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

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

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

  331.                     return -1;

  332.                 }

  333.             } else

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

  335.             pkt->stream_index = index;

  336.             pkt->pos = klv.offset;

  337.             return 0;

  338.         } else

  339.         skip:

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

  341.     }

  342.     return AVERROR_EOF;

  343. }

  344. 

  345. static int mxf_read_primer_pack(MXFContext *mxf)

  346. {

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

  348.     int item_num = get_be32(pb);

  349.     int item_len = get_be32(pb);

  350. 

  351.     if (item_len != 18) {

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

  353.         return -1;

  354.     }

  355.     if (item_num > UINT_MAX / item_len)

  356.         return -1;

  357.     mxf->local_tags_count = item_num;

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

  359.     if (!mxf->local_tags)

  360.         return -1;

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

  362.     return 0;

  363. }

  364. 

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

  366. {

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

  368.         return AVERROR(ENOMEM);

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

  370.     if (!mxf->metadata_sets)

  371.         return -1;

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

  373.     mxf->metadata_sets_count++;

  374.     return 0;

  375. }

  376. 

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

  378. {

  379.     if (size != 16)

  380.         return -1;

  381.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  383.     return 0;

  384. }

  385. 

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

  387. {

  388.     switch (tag) {

  389.     case 0x1901:

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

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

  392.             return -1;

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

  394.         if (!mxf->packages_refs)

  395.             return -1;

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

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

  398.         break;

  399.     }

  400.     return 0;

  401. }

  402. 

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

  404. {

  405.     switch(tag) {

  406.     case 0x0202:

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

  408.         break;

  409.     case 0x1201:

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

  411.         break;

  412.     case 0x1101:

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

  414.         url_fskip(pb, 16);

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

  416.         break;

  417.     case 0x1102:

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

  419.         break;

  420.     }

  421.     return 0;

  422. }

  423. 

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

  425. {

  426.     switch(tag) {

  427.     case 0x4403:

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

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

  430.             return -1;

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

  432.         if (!package->tracks_refs)

  433.             return -1;

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

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

  436.         break;

  437.     }

  438.     return 0;

  439. }

  440. 

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

  442. {

  443.     switch(tag) {

  444.     case 0x4801:

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

  446.         break;

  447.     case 0x4804:

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

  449.         break;

  450.     case 0x4B01:

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

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

  453.         break;

  454.     case 0x4803:

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

  456.         break;

  457.     }

  458.     return 0;

  459. }

  460. 

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

  462. {

  463.     switch(tag) {

  464.     case 0x0202:

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

  466.         break;

  467.     case 0x0201:

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

  469.         break;

  470.     case 0x1001:

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

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

  473.             return -1;

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

  475.         if (!sequence->structural_components_refs)

  476.             return -1;

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

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

  479.         break;

  480.     }

  481.     return 0;

  482. }

  483. 

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

  485. {

  486.     switch(tag) {

  487.     case 0x4403:

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

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

  490.             return -1;

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

  492.         if (!package->tracks_refs)

  493.             return -1;

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

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

  496.         break;

  497.     case 0x4401:

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

  499.         url_fskip(pb, 16);

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

  501.         break;

  502.     case 0x4701:

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

  504.         break;

  505.     }

  506.     return 0;

  507. }

  508. 

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

  510. {

  511.     switch(tag) {

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

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

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

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

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

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

  518.     }

  519.     return 0;

  520. }

  521. 

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

  523. {

  524.     int code, value, ofs = 0;

  525.     char layout[16] = {};

  526. 

  527.     do {

  528.         code = get_byte(pb);

  529.         value = get_byte(pb);

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

  531. 

  532.         if (ofs < 16) {

  533.             layout[ofs++] = code;

  534.             layout[ofs++] = value;

  535.         }

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

  537. 

  538.     ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);

  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->uid[0]) {

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

  621.             break;

  622.         uls++;

  623.     }

  624.     return uls;

  625. }

  626. 

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

  628. {

  629.     int i;

  630. 

  631.     if (!strong_ref)

  632.         return NULL;

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

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

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

  636.             return mxf->metadata_sets[i];

  637.         }

  638.     }

  639.     return NULL;

  640. }

  641. 

  642. static const MXFCodecUL mxf_essence_container_uls[] = {

  643.     // video essence container uls

  644.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  645.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  646.     // sound essence container uls

  647.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  648.     { { 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 */

  649.     { { 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 */

  650.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  651. };

  652. 

  653. static int mxf_parse_structural_metadata(MXFContext *mxf)

  654. {

  655.     MXFPackage *material_package = NULL;

  656.     MXFPackage *temp_package = NULL;

  657.     int i, j, k;

  658. 

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

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

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

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

  663.         if (material_package) break;

  664.     }

  665.     if (!material_package) {

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

  667.         return -1;

  668.     }

  669. 

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

  671.         MXFPackage *source_package = NULL;

  672.         MXFTrack *material_track = NULL;

  673.         MXFTrack *source_track = NULL;

  674.         MXFTrack *temp_track = NULL;

  675.         MXFDescriptor *descriptor = NULL;

  676.         MXFStructuralComponent *component = NULL;

  677.         UID *essence_container_ul = NULL;

  678.         const MXFCodecUL *codec_ul = NULL;

  679.         const MXFCodecUL *container_ul = NULL;

  680.         AVStream *st;

  681. 

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

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

  684.             continue;

  685.         }

  686. 

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

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

  689.             continue;

  690.         }

  691. 

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

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

  694.             /* TODO: handle timecode component */

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

  696.             if (!component)

  697.                 continue;

  698. 

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

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

  701.                 if (!temp_package)

  702.                     continue;

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

  704.                     source_package = temp_package;

  705.                     break;

  706.                 }

  707.             }

  708.             if (!source_package) {

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

  710.                 break;

  711.             }

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

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

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

  715.                     return -1;

  716.                 }

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

  718.                     source_track = temp_track;

  719.                     break;

  720.                 }

  721.             }

  722.             if (!source_track) {

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

  724.                 break;

  725.             }

  726.         }

  727.         if (!source_track)

  728.             continue;

  729. 

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

  731.         if (!st) {

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

  733.             return -1;

  734.         }

  735.         st->priv_data = source_track;

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

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

  738.             st->duration = AV_NOPTS_VALUE;

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

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

  741. 

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

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

  744.             return -1;

  745.         }

  746. 

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

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

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

  750. 

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

  752.         if (source_package->descriptor) {

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

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

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

  756. 

  757.                     if (!sub_descriptor) {

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

  759.                         continue;

  760.                     }

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

  762.                         descriptor = sub_descriptor;

  763.                         break;

  764.                     }

  765.                 }

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

  767.                 descriptor = source_package->descriptor;

  768.         }

  769.         if (!descriptor) {

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

  771.             continue;

  772.         }

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

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

  775.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  784.                     break;

  785.                 }

  786.             }

  787.         }

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

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

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

  791.         if (descriptor->extradata) {

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

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

  794.         }

  795.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  796.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

  801.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

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

  803.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  804.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  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->channels = descriptor->channels;

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

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

  811.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  823.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  824.             }

  825.         }

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

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

  828.             st->need_parsing = AVSTREAM_PARSE_FULL;

  829.         }

  830.     }

  831.     return 0;

  832. }

  833. 

  834. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  835.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  836.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  837.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  838.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  839.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  840.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  841.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  842.     { { 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 */

  843.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  844.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  845.     { { 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 */

  846.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  847.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  848.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  849.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  850.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  851.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  852.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  853. };

  854. 

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

  856. {

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

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

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

  860. 

  861.     if (!ctx)

  862.         return -1;

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

  864.         int tag = get_be16(pb);

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

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

  867.         UID uid = {0};

  868. 

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

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

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

  872.             continue;

  873.         }

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

  875.             int i;

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

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

  878.                 if (local_tag == tag) {

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

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

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

  882.                 }

  883.             }

  884.         }

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

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

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

  888.             return -1;

  889. 

  890.         url_fseek(pb, next, SEEK_SET);

  891.     }

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

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

  894. }

  895. 

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

  897. {

  898.     MXFContext *mxf = s->priv_data;

  899.     KLVPacket klv;

  900. 

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

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

  903.         return -1;

  904.     }

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

  906.     mxf->fc = s;

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

  908.         const MXFMetadataReadTableEntry *metadata;

  909. 

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

  911.             return -1;

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

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

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

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

  916.             /* FIXME avoid seek */

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

  918.             break;

  919.         }

  920. 

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

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

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

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

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

  926.                     return -1;

  927.                 }

  928.                 break;

  929.             }

  930.         }

  931.         if (!metadata->read)

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

  933.     }

  934.     return mxf_parse_structural_metadata(mxf);

  935. }

  936. 

  937. static int mxf_read_close(AVFormatContext *s)

  938. {

  939.     MXFContext *mxf = s->priv_data;

  940.     int i;

  941. 

  942.     av_freep(&mxf->packages_refs);

  943. 

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

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

  946. 

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

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

  949.         case MultipleDescriptor:

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

  951.             break;

  952.         case Sequence:

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

  954.             break;

  955.         case SourcePackage:

  956.         case MaterialPackage:

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

  958.             break;

  959.         default:

  960.             break;

  961.         }

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

  963.     }

  964.     av_freep(&mxf->metadata_sets);

  965.     av_freep(&mxf->aesc);

  966.     av_freep(&mxf->local_tags);

  967.     return 0;

  968. }

  969. 

  970. static int mxf_probe(AVProbeData *p) {

  971.     uint8_t *bufp = p->buf;

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

  973. 

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

  975.         return 0;

  976. 

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

  978.     end -= sizeof(mxf_header_partition_pack_key);

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

  980.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  981.             return AVPROBE_SCORE_MAX;

  982.     }

  983.     return 0;

  984. }

  985. 

  986. /* rudimentary byte seek */

  987. /* XXX: use MXF Index */

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

  989. {

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

  991.     int64_t seconds;

  992. 

  993.     if (!s->bit_rate)

  994.         return -1;

  995.     if (sample_time < 0)

  996.         sample_time = 0;

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

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

  999.     av_update_cur_dts(s, st, sample_time);

  1000.     return 0;

  1001. }

  1002. 

  1003. AVInputFormat mxf_demuxer = {

  1004.     "mxf",

  1005.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1006.     sizeof(MXFContext),

  1007.     mxf_probe,

  1008.     mxf_read_header,

  1009.     mxf_read_packet,

  1010.     mxf_read_close,

  1011.     mxf_read_seek,

  1012. };