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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "mxf.h"

  50. 

  51. typedef struct {

  52.     UID uid;

  53.     enum MXFMetadataSetType type;

  54.     UID source_container_ul;

  55. } MXFCryptoContext;

  56. 

  57. typedef struct {

  58.     UID uid;

  59.     enum MXFMetadataSetType type;

  60.     UID source_package_uid;

  61.     UID data_definition_ul;

  62.     int64_t duration;

  63.     int64_t start_position;

  64.     int source_track_id;

  65. } MXFStructuralComponent;

  66. 

  67. typedef struct {

  68.     UID uid;

  69.     enum MXFMetadataSetType type;

  70.     UID data_definition_ul;

  71.     UID *structural_components_refs;

  72.     int structural_components_count;

  73.     int64_t duration;

  74. } MXFSequence;

  75. 

  76. typedef struct {

  77.     UID uid;

  78.     enum MXFMetadataSetType type;

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

  80.     UID sequence_ref;

  81.     int track_id;

  82.     uint8_t track_number[4];

  83.     AVRational edit_rate;

  84. } MXFTrack;

  85. 

  86. typedef struct {

  87.     UID uid;

  88.     enum MXFMetadataSetType type;

  89.     UID essence_container_ul;

  90.     UID essence_codec_ul;

  91.     AVRational sample_rate;

  92.     AVRational aspect_ratio;

  93.     int width;

  94.     int height;

  95.     int channels;

  96.     int bits_per_sample;

  97.     UID *sub_descriptors_refs;

  98.     int sub_descriptors_count;

  99.     int linked_track_id;

  100.     uint8_t *extradata;

  101.     int extradata_size;

  102. } MXFDescriptor;

  103. 

  104. typedef struct {

  105.     UID uid;

  106.     enum MXFMetadataSetType type;

  107.     UID package_uid;

  108.     UID *tracks_refs;

  109.     int tracks_count;

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

  111.     UID descriptor_ref;

  112. } MXFPackage;

  113. 

  114. typedef struct {

  115.     UID uid;

  116.     enum MXFMetadataSetType type;

  117. } MXFMetadataSet;

  118. 

  119. typedef struct {

  120.     UID *packages_refs;

  121.     int packages_count;

  122.     MXFMetadataSet **metadata_sets;

  123.     int metadata_sets_count;

  124.     AVFormatContext *fc;

  125.     struct AVAES *aesc;

  126.     uint8_t *local_tags;

  127.     int local_tags_count;

  128. } MXFContext;

  129. 

  130. enum MXFWrappingScheme {

  131.     Frame,

  132.     Clip,

  133. };

  134. 

  135. typedef struct {

  136.     const UID key;

  137.     int (*read)();

  138.     int ctx_size;

  139.     enum MXFMetadataSetType type;

  140. } MXFMetadataReadTableEntry;

  141. 

  142. /* partial keys to match */

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

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

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

  146. /* complete keys to match */

  147. 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 };

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

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

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

  151. 

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

  153. 

  154. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  155. {

  156.     uint64_t size = get_byte(pb);

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

  158.         int bytes_num = size & 0x7f;

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

  160.         if (bytes_num > 8)

  161.             return -1;

  162.         size = 0;

  163.         while (bytes_num--)

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

  165.     }

  166.     return size;

  167. }

  168. 

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

  170. {

  171.     int i, b;

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

  173.         b = get_byte(pb);

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

  175.             i = 0;

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

  177.             i = -1;

  178.     }

  179.     return i == size;

  180. }

  181. 

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

  183. {

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

  185.         return -1;

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

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

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

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

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

  191. }

  192. 

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

  194. {

  195.     int i;

  196. 

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

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

  199.         /* SMPTE 379M 7.3 */

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

  201.             return i;

  202.     }

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

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

  205. }

  206. 

  207. /* XXX: use AVBitStreamFilter */

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

  209. {

  210.     uint8_t buffer[61444];

  211.     const uint8_t *buf_ptr, *end_ptr;

  212.     uint8_t *data_ptr;

  213.     int i;

  214. 

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

  216.         return -1;

  217.     get_buffer(pb, buffer, length);

  218.     av_new_packet(pkt, length);

  219.     data_ptr = pkt->data;

  220.     end_ptr = buffer + length;

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

  222.     for (; buf_ptr < end_ptr; ) {

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

  224.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  227.             else

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

  229.         }

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

  231.     }

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

  233.     return 0;

  234. }

  235. 

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

  237. {

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

  239.     MXFContext *mxf = s->priv_data;

  240.     ByteIOContext *pb = s->pb;

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

  242.     uint64_t size;

  243.     uint64_t orig_size;

  244.     uint64_t plaintext_size;

  245.     uint8_t ivec[16];

  246.     uint8_t tmpbuf[16];

  247.     int index;

  248. 

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

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

  251.         if (!mxf->aesc)

  252.             return -1;

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

  254.     }

  255.     // crypto context

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

  257.     // plaintext offset

  258.     klv_decode_ber_length(pb);

  259.     plaintext_size = get_be64(pb);

  260.     // source klv key

  261.     klv_decode_ber_length(pb);

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

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

  264.         return -1;

  265.     index = mxf_get_stream_index(s, klv);

  266.     if (index < 0)

  267.         return -1;

  268.     // source size

  269.     klv_decode_ber_length(pb);

  270.     orig_size = get_be64(pb);

  271.     if (orig_size < plaintext_size)

  272.         return -1;

  273.     // enc. code

  274.     size = klv_decode_ber_length(pb);

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

  276.         return -1;

  277.     get_buffer(pb, ivec, 16);

  278.     get_buffer(pb, tmpbuf, 16);

  279.     if (mxf->aesc)

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

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

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

  283.     size -= 32;

  284.     av_get_packet(pb, pkt, size);

  285.     size -= plaintext_size;

  286.     if (mxf->aesc)

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

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

  289.     pkt->size = orig_size;

  290.     pkt->stream_index = index;

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

  292.     return 0;

  293. }

  294. 

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

  296. {

  297.     KLVPacket klv;

  298. 

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

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

  301.             return -1;

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

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

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

  305.             if (res < 0) {

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

  307.                 return -1;

  308.             }

  309.             return 0;

  310.         }

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

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

  313.             if (index < 0) {

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

  315.                 goto skip;

  316.             }

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

  318.                 goto skip;

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

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

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

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

  323.                     return -1;

  324.                 }

  325.             } else

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

  327.             pkt->stream_index = index;

  328.             pkt->pos = klv.offset;

  329.             return 0;

  330.         } else

  331.         skip:

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

  333.     }

  334.     return AVERROR(EIO);

  335. }

  336. 

  337. static int mxf_read_primer_pack(MXFContext *mxf)

  338. {

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

  340.     int item_num = get_be32(pb);

  341.     int item_len = get_be32(pb);

  342. 

  343.     if (item_len != 18) {

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

  345.         return -1;

  346.     }

  347.     if (item_num > UINT_MAX / item_len)

  348.         return -1;

  349.     mxf->local_tags_count = item_num;

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

  351.     if (!mxf->local_tags)

  352.         return -1;

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

  354.     return 0;

  355. }

  356. 

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

  358. {

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

  360.     if (!mxf->metadata_sets)

  361.         return -1;

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

  363.     mxf->metadata_sets_count++;

  364.     return 0;

  365. }

  366. 

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

  368. {

  369.     if (size != 16)

  370.         return -1;

  371.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  373.     return 0;

  374. }

  375. 

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

  377. {

  378.     switch (tag) {

  379.     case 0x1901:

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

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

  382.             return -1;

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

  384.         if (!mxf->packages_refs)

  385.             return -1;

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

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

  388.         break;

  389.     }

  390.     return 0;

  391. }

  392. 

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

  394. {

  395.     switch(tag) {

  396.     case 0x0202:

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

  398.         break;

  399.     case 0x1201:

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

  401.         break;

  402.     case 0x1101:

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

  404.         url_fskip(pb, 16);

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

  406.         break;

  407.     case 0x1102:

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

  409.         break;

  410.     }

  411.     return 0;

  412. }

  413. 

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

  415. {

  416.     switch(tag) {

  417.     case 0x4403:

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

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

  420.             return -1;

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

  422.         if (!package->tracks_refs)

  423.             return -1;

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

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

  426.         break;

  427.     }

  428.     return 0;

  429. }

  430. 

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

  432. {

  433.     switch(tag) {

  434.     case 0x4801:

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

  436.         break;

  437.     case 0x4804:

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

  439.         break;

  440.     case 0x4B01:

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

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

  443.         break;

  444.     case 0x4803:

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

  446.         break;

  447.     }

  448.     return 0;

  449. }

  450. 

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

  452. {

  453.     switch(tag) {

  454.     case 0x0202:

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

  456.         break;

  457.     case 0x0201:

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

  459.         break;

  460.     case 0x1001:

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

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

  463.             return -1;

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

  465.         if (!sequence->structural_components_refs)

  466.             return -1;

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

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

  469.         break;

  470.     }

  471.     return 0;

  472. }

  473. 

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

  475. {

  476.     switch(tag) {

  477.     case 0x4403:

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

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

  480.             return -1;

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

  482.         if (!package->tracks_refs)

  483.             return -1;

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

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

  486.         break;

  487.     case 0x4401:

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

  489.         url_fskip(pb, 16);

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

  491.         break;

  492.     case 0x4701:

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

  494.         break;

  495.     }

  496.     return 0;

  497. }

  498. 

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

  500. {

  501.     int code;

  502. 

  503.     do {

  504.         code = get_byte(pb);

  505.         dprintf(NULL, "pixel layout: code 0x%x\n", code);

  506.         switch (code) {

  507.         case 0x52: /* R */

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

  509.             break;

  510.         case 0x47: /* G */

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

  512.             break;

  513.         case 0x42: /* B */

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

  515.             break;

  516.         default:

  517.             get_byte(pb);

  518.         }

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

  520. }

  521. 

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

  523. {

  524.     switch(tag) {

  525.     case 0x3F01:

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

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

  528.             return -1;

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

  530.         if (!descriptor->sub_descriptors_refs)

  531.             return -1;

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

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

  534.         break;

  535.     case 0x3004:

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

  537.         break;

  538.     case 0x3006:

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

  540.         break;

  541.     case 0x3201: /* PictureEssenceCoding */

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

  543.         break;

  544.     case 0x3203:

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

  546.         break;

  547.     case 0x3202:

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

  549.         break;

  550.     case 0x320E:

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

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

  553.         break;

  554.     case 0x3D03:

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

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

  557.         break;

  558.     case 0x3D06: /* SoundEssenceCompression */

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

  560.         break;

  561.     case 0x3D07:

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

  563.         break;

  564.     case 0x3D01:

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

  566.         break;

  567.     case 0x3401:

  568.         mxf_read_pixel_layout(pb, descriptor);

  569.         break;

  570.     default:

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

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

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

  574.             if (!descriptor->extradata)

  575.                 return -1;

  576.             descriptor->extradata_size = size;

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

  578.         }

  579.         break;

  580.     }

  581.     return 0;

  582. }

  583. 

  584. /*

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

  586.  * Returns: boolean

  587.  */

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

  589. {

  590.     int i;

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

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

  593.             return 0;

  594.     }

  595.     return 1;

  596. }

  597. 

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

  599. {

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

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

  602.             break;

  603.         uls++;

  604.     }

  605.     return uls;

  606. }

  607. 

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

  609. {

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

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

  612.             break;

  613.         uls++;

  614.     }

  615.     return uls->type;

  616. }

  617. 

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

  619. {

  620.     int i;

  621. 

  622.     if (!strong_ref)

  623.         return NULL;

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

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

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

  627.             return mxf->metadata_sets[i];

  628.         }

  629.     }

  630.     return NULL;

  631. }

  632. 

  633. static const MXFCodecUL mxf_essence_container_uls[] = {

  634.     // video essence container uls

  635.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  636.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  637.     // sound essence container uls

  638.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  639.     { { 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 */

  640.     { { 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 */

  641.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  642. };

  643. 

  644. static int mxf_parse_structural_metadata(MXFContext *mxf)

  645. {

  646.     MXFPackage *material_package = NULL;

  647.     MXFPackage *temp_package = NULL;

  648.     int i, j, k;

  649. 

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

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

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

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

  654.         if (material_package) break;

  655.     }

  656.     if (!material_package) {

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

  658.         return -1;

  659.     }

  660. 

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

  662.         MXFPackage *source_package = NULL;

  663.         MXFTrack *material_track = NULL;

  664.         MXFTrack *source_track = NULL;

  665.         MXFTrack *temp_track = NULL;

  666.         MXFDescriptor *descriptor = NULL;

  667.         MXFStructuralComponent *component = NULL;

  668.         UID *essence_container_ul = NULL;

  669.         const MXFCodecUL *codec_ul = NULL;

  670.         const MXFCodecUL *container_ul = NULL;

  671.         AVStream *st;

  672. 

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

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

  675.             continue;

  676.         }

  677. 

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

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

  680.             return -1;

  681.         }

  682. 

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

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

  685.             /* TODO: handle timecode component */

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

  687.             if (!component)

  688.                 continue;

  689. 

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

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

  692.                 if (!temp_package)

  693.                     continue;

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

  695.                     source_package = temp_package;

  696.                     break;

  697.                 }

  698.             }

  699.             if (!source_package) {

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

  701.                 break;

  702.             }

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

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

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

  706.                     return -1;

  707.                 }

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

  709.                     source_track = temp_track;

  710.                     break;

  711.                 }

  712.             }

  713.             if (!source_track) {

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

  715.                 break;

  716.             }

  717.         }

  718.         if (!source_track)

  719.             continue;

  720. 

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

  722.         if (!st) {

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

  724.             return -1;

  725.         }

  726.         st->priv_data = source_track;

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

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

  729.             st->duration = AV_NOPTS_VALUE;

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

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

  732. 

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

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

  735.             return -1;

  736.         }

  737. 

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

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

  740. 

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

  742.         if (source_package->descriptor) {

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

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

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

  746. 

  747.                     if (!sub_descriptor) {

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

  749.                         continue;

  750.                     }

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

  752.                         descriptor = sub_descriptor;

  753.                         break;

  754.                     }

  755.                 }

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

  757.                 descriptor = source_package->descriptor;

  758.         }

  759.         if (!descriptor) {

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

  761.             continue;

  762.         }

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

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

  765.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  774.                     break;

  775.                 }

  776.             }

  777.         }

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

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

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

  781.         if (descriptor->extradata) {

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

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

  784.         }

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

  786.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  792.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  794.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  800.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  812.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  813.             }

  814.         }

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

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

  817.             st->need_parsing = AVSTREAM_PARSE_FULL;

  818.         }

  819.     }

  820.     return 0;

  821. }

  822. 

  823. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  824.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  825.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  826.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  827.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  828.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  829.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  830.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  831.     { { 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 */

  832.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  833.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  834.     { { 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 */

  835.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  836.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  837.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  838.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  839.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  840.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  841. };

  842. 

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

  844. {

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

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

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

  848. 

  849.     if (!ctx)

  850.         return -1;

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

  852.         int tag = get_be16(pb);

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

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

  855.         UID uid = {0};

  856. 

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

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

  859.             continue;

  860.         }

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

  862.             int i;

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

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

  865.                 if (local_tag == tag) {

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

  867.                     dprintf(mxf->fc, "local tag 0x%04X\n", local_tag);

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

  869.                 }

  870.             }

  871.         }

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

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

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

  875.             return -1;

  876. 

  877.         url_fseek(pb, next, SEEK_SET);

  878.     }

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

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

  881. }

  882. 

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

  884. {

  885.     MXFContext *mxf = s->priv_data;

  886.     KLVPacket klv;

  887. 

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

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

  890.         return -1;

  891.     }

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

  893.     mxf->fc = s;

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

  895.         const MXFMetadataReadTableEntry *metadata;

  896. 

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

  898.             return -1;

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

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

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

  902.             /* FIXME avoid seek */

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

  904.             break;

  905.         }

  906. 

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

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

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

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

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

  912.                     return -1;

  913.                 }

  914.                 break;

  915.             }

  916.         }

  917.         if (!metadata->read)

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

  919.     }

  920.     return mxf_parse_structural_metadata(mxf);

  921. }

  922. 

  923. static int mxf_read_close(AVFormatContext *s)

  924. {

  925.     MXFContext *mxf = s->priv_data;

  926.     int i;

  927. 

  928.     av_freep(&mxf->packages_refs);

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

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

  931.         case MultipleDescriptor:

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

  933.             break;

  934.         case Sequence:

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

  936.             break;

  937.         case SourcePackage:

  938.         case MaterialPackage:

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

  940.             break;

  941.         case Track:

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

  943.             break;

  944.         default:

  945.             break;

  946.         }

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

  948.     }

  949.     av_freep(&mxf->metadata_sets);

  950.     av_freep(&mxf->aesc);

  951.     av_freep(&mxf->local_tags);

  952.     return 0;

  953. }

  954. 

  955. static int mxf_probe(AVProbeData *p) {

  956.     uint8_t *bufp = p->buf;

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

  958. 

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

  960.         return 0;

  961. 

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

  963.     end -= sizeof(mxf_header_partition_pack_key);

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

  965.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  966.             return AVPROBE_SCORE_MAX;

  967.     }

  968.     return 0;

  969. }

  970. 

  971. /* rudimentary byte seek */

  972. /* XXX: use MXF Index */

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

  974. {

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

  976.     int64_t seconds;

  977. 

  978.     if (!s->bit_rate)

  979.         return -1;

  980.     if (sample_time < 0)

  981.         sample_time = 0;

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

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

  984.     av_update_cur_dts(s, st, sample_time);

  985.     return 0;

  986. }

  987. 

  988. AVInputFormat mxf_demuxer = {

  989.     "mxf",

  990.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  991.     sizeof(MXFContext),

  992.     mxf_probe,

  993.     mxf_read_header,

  994.     mxf_read_packet,

  995.     mxf_read_close,

  996.     mxf_read_seek,

  997. };