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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 "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

  72. } MXFOP;

  73. 

  74. typedef struct {

  75.     int closed;

  76.     int complete;

  77.     MXFPartitionType type;

  78.     uint64_t previous_partition;

  79.     int index_sid;

  80.     int body_sid;

  81. } MXFPartition;

  82. 

  83. typedef struct {

  84.     UID uid;

  85.     enum MXFMetadataSetType type;

  86.     UID source_container_ul;

  87. } MXFCryptoContext;

  88. 

  89. typedef struct {

  90.     UID uid;

  91.     enum MXFMetadataSetType type;

  92.     UID source_package_uid;

  93.     UID data_definition_ul;

  94.     int64_t duration;

  95.     int64_t start_position;

  96.     int source_track_id;

  97. } MXFStructuralComponent;

  98. 

  99. typedef struct {

  100.     UID uid;

  101.     enum MXFMetadataSetType type;

  102.     UID data_definition_ul;

  103.     UID *structural_components_refs;

  104.     int structural_components_count;

  105.     int64_t duration;

  106. } MXFSequence;

  107. 

  108. typedef struct {

  109.     UID uid;

  110.     enum MXFMetadataSetType type;

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

  112.     UID sequence_ref;

  113.     int track_id;

  114.     uint8_t track_number[4];

  115.     AVRational edit_rate;

  116. } MXFTrack;

  117. 

  118. typedef struct {

  119.     UID uid;

  120.     enum MXFMetadataSetType type;

  121.     UID essence_container_ul;

  122.     UID essence_codec_ul;

  123.     AVRational sample_rate;

  124.     AVRational aspect_ratio;

  125.     int width;

  126.     int height;

  127.     int channels;

  128.     int bits_per_sample;

  129.     UID *sub_descriptors_refs;

  130.     int sub_descriptors_count;

  131.     int linked_track_id;

  132.     uint8_t *extradata;

  133.     int extradata_size;

  134.     enum PixelFormat pix_fmt;

  135. } MXFDescriptor;

  136. 

  137. typedef struct {

  138.     UID uid;

  139.     enum MXFMetadataSetType type;

  140.     int edit_unit_byte_count;

  141.     int index_sid;

  142.     int body_sid;

  143.     int slice_count;

  144.     AVRational index_edit_rate;

  145.     uint64_t index_start_position;

  146.     uint64_t index_duration;

  147.     int *slice;

  148.     int *element_delta;

  149.     int nb_delta_entries;

  150.     int *flag_entries;

  151.     uint64_t *stream_offset_entries;

  152.     uint32_t **slice_offset_entries;

  153.     int nb_index_entries;

  154. } MXFIndexTableSegment;

  155. 

  156. typedef struct {

  157.     UID uid;

  158.     enum MXFMetadataSetType type;

  159.     UID package_uid;

  160.     UID *tracks_refs;

  161.     int tracks_count;

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

  163.     UID descriptor_ref;

  164. } MXFPackage;

  165. 

  166. typedef struct {

  167.     UID uid;

  168.     enum MXFMetadataSetType type;

  169. } MXFMetadataSet;

  170. 

  171. typedef struct {

  172.     MXFPartition *partitions;

  173.     unsigned partitions_count;

  174.     MXFOP op;

  175.     UID *packages_refs;

  176.     int packages_count;

  177.     MXFMetadataSet **metadata_sets;

  178.     int metadata_sets_count;

  179.     AVFormatContext *fc;

  180.     struct AVAES *aesc;

  181.     uint8_t *local_tags;

  182.     int local_tags_count;

  183.     uint64_t footer_partition;

  184.     int system_item;

  185.     int64_t essence_offset;

  186.     int first_essence_kl_length;

  187.     int64_t first_essence_length;

  188.     KLVPacket current_klv_data;

  189.     int current_klv_index;

  190. } MXFContext;

  191. 

  192. enum MXFWrappingScheme {

  193.     Frame,

  194.     Clip,

  195. };

  196. 

  197. typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid);

  198. 

  199. typedef struct {

  200.     const UID key;

  201.     MXFMetadataReadFunc *read;

  202.     int ctx_size;

  203.     enum MXFMetadataSetType type;

  204. } MXFMetadataReadTableEntry;

  205. 

  206. /* partial keys to match */

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

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

  209. static const uint8_t mxf_system_item_key[]                 = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04 };

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

  211. /* complete keys to match */

  212. 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 };

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

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

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

  216. 

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

  218. 

  219. static int64_t klv_decode_ber_length(AVIOContext *pb)

  220. {

  221.     uint64_t size = avio_r8(pb);

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

  223.         int bytes_num = size & 0x7f;

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

  225.         if (bytes_num > 8)

  226.             return -1;

  227.         size = 0;

  228.         while (bytes_num--)

  229.             size = size << 8 | avio_r8(pb);

  230.     }

  231.     return size;

  232. }

  233. 

  234. static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)

  235. {

  236.     int i, b;

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

  238.         b = avio_r8(pb);

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

  240.             i = 0;

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

  242.             i = -1;

  243.     }

  244.     return i == size;

  245. }

  246. 

  247. static int klv_read_packet(KLVPacket *klv, AVIOContext *pb)

  248. {

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

  250.         return -1;

  251.     klv->offset = avio_tell(pb) - 4;

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

  253.     avio_read(pb, klv->key + 4, 12);

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

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

  256. }

  257. 

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

  259. {

  260.     int i;

  261. 

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

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

  264.         /* SMPTE 379M 7.3 */

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

  266.             return i;

  267.     }

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

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

  270. }

  271. 

  272. /* XXX: use AVBitStreamFilter */

  273. static int mxf_get_d10_aes3_packet(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)

  274. {

  275.     const uint8_t *buf_ptr, *end_ptr;

  276.     uint8_t *data_ptr;

  277.     int i;

  278. 

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

  280.         return -1;

  281.     length = av_get_packet(pb, pkt, length);

  282.     if (length < 0)

  283.         return length;

  284.     data_ptr = pkt->data;

  285.     end_ptr = pkt->data + length;

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

  287.     for (; buf_ptr + st->codec->channels*4 < end_ptr; ) {

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

  289.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  292.             else

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

  294.         }

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

  296.     }

  297.     av_shrink_packet(pkt, data_ptr - pkt->data);

  298.     return 0;

  299. }

  300. 

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

  302. {

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

  304.     MXFContext *mxf = s->priv_data;

  305.     AVIOContext *pb = s->pb;

  306.     int64_t end = avio_tell(pb) + klv->length;

  307.     int64_t size;

  308.     uint64_t orig_size;

  309.     uint64_t plaintext_size;

  310.     uint8_t ivec[16];

  311.     uint8_t tmpbuf[16];

  312.     int index;

  313. 

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

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

  316.         if (!mxf->aesc)

  317.             return -1;

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

  319.     }

  320.     // crypto context

  321.     avio_skip(pb, klv_decode_ber_length(pb));

  322.     // plaintext offset

  323.     klv_decode_ber_length(pb);

  324.     plaintext_size = avio_rb64(pb);

  325.     // source klv key

  326.     klv_decode_ber_length(pb);

  327.     avio_read(pb, klv->key, 16);

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

  329.         return -1;

  330.     index = mxf_get_stream_index(s, klv);

  331.     if (index < 0)

  332.         return -1;

  333.     // source size

  334.     klv_decode_ber_length(pb);

  335.     orig_size = avio_rb64(pb);

  336.     if (orig_size < plaintext_size)

  337.         return -1;

  338.     // enc. code

  339.     size = klv_decode_ber_length(pb);

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

  341.         return -1;

  342.     avio_read(pb, ivec, 16);

  343.     avio_read(pb, tmpbuf, 16);

  344.     if (mxf->aesc)

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

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

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

  348.     size -= 32;

  349.     size = av_get_packet(pb, pkt, size);

  350.     if (size < 0)

  351.         return size;

  352.     else if (size < plaintext_size)

  353.         return AVERROR_INVALIDDATA;

  354.     size -= plaintext_size;

  355.     if (mxf->aesc)

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

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

  358.     av_shrink_packet(pkt, orig_size);

  359.     pkt->stream_index = index;

  360.     avio_skip(pb, end - avio_tell(pb));

  361.     return 0;

  362. }

  363. 

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

  365. {

  366.     KLVPacket klv;

  367. 

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

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

  370.             return -1;

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

  372.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

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

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

  375.             if (res < 0) {

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

  377.                 return -1;

  378.             }

  379.             return 0;

  380.         }

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

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

  383.             if (index < 0) {

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

  385.                 goto skip;

  386.             }

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

  388.                 goto skip;

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

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

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

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

  393.                     return -1;

  394.                 }

  395.             } else {

  396.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  397.                 if (ret < 0)

  398.                     return ret;

  399.             }

  400.             pkt->stream_index = index;

  401.             pkt->pos = klv.offset;

  402.             return 0;

  403.         } else

  404.         skip:

  405.             avio_skip(s->pb, klv.length);

  406.     }

  407.     return AVERROR_EOF;

  408. }

  409. 

  410. static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  411. {

  412.     MXFContext *mxf = arg;

  413.     int item_num = avio_rb32(pb);

  414.     int item_len = avio_rb32(pb);

  415. 

  416.     if (item_len != 18) {

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

  418.         return -1;

  419.     }

  420.     if (item_num > UINT_MAX / item_len)

  421.         return -1;

  422.     mxf->local_tags_count = item_num;

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

  424.     if (!mxf->local_tags)

  425.         return -1;

  426.     avio_read(pb, mxf->local_tags, item_num*item_len);

  427.     return 0;

  428. }

  429. 

  430. static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  431. {

  432.     MXFContext *mxf = arg;

  433.     MXFPartition *partition;

  434.     UID op;

  435.     uint64_t footer_partition;

  436. 

  437.     if (mxf->partitions_count+1 >= UINT_MAX / sizeof(*mxf->partitions))

  438.         return AVERROR(ENOMEM);

  439. 

  440.     mxf->partitions = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));

  441.     if (!mxf->partitions)

  442.         return AVERROR(ENOMEM);

  443. 

  444.     partition = &mxf->partitions[mxf->partitions_count++];

  445. 

  446.     switch(uid[13]) {

  447.     case 2:

  448.         partition->type = Header;

  449.         break;

  450.     case 3:

  451.         partition->type = BodyPartition;

  452.         break;

  453.     case 4:

  454.         partition->type = Footer;

  455.         break;

  456.     default:

  457.         av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);

  458.         return AVERROR_INVALIDDATA;

  459.     }

  460. 

  461.     /* consider both footers to be closed (there is only Footer and CompleteFooter) */

  462.     partition->closed = partition->type == Footer || !(uid[14] & 1);

  463.     partition->complete = uid[14] > 2;

  464.     avio_skip(pb, 16);

  465.     partition->previous_partition = avio_rb64(pb);

  466.     footer_partition = avio_rb64(pb);

  467.     avio_skip(pb, 16);

  468.     partition->index_sid = avio_rb32(pb);

  469.     avio_skip(pb, 8);

  470.     partition->body_sid = avio_rb32(pb);

  471.     avio_read(pb, op, sizeof(UID));

  472. 

  473.     /* some files don'thave FooterPartition set in every partition */

  474.     if (footer_partition) {

  475.         if (mxf->footer_partition && mxf->footer_partition != footer_partition) {

  476.             av_log(mxf->fc, AV_LOG_ERROR, "inconsistent FooterPartition value: %li != %li\n",

  477.                    mxf->footer_partition, footer_partition);

  478.         } else {

  479.             mxf->footer_partition = footer_partition;

  480.         }

  481.     }

  482. 

  483.     av_dlog(mxf->fc, "PartitionPack: PreviousPartition = 0x%lx, "

  484.             "FooterPartition = 0x%lx, IndexSID = %i, BodySID = %i\n",

  485.             partition->previous_partition, footer_partition,

  486.             partition->index_sid, partition->body_sid);

  487. 

  488.     if      (op[12] == 1 && op[13] == 1) mxf->op = OP1a;

  489.     else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;

  490.     else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;

  491.     else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;

  492.     else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;

  493.     else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;

  494.     else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;

  495.     else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;

  496.     else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;

  497.     else if (op[12] == 0x10)             mxf->op = OPAtom;

  498.     else

  499.         av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh\n", op[12], op[13]);

  500. 

  501.     return 0;

  502. }

  503. 

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

  505. {

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

  507.         return AVERROR(ENOMEM);

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

  509.     if (!mxf->metadata_sets)

  510.         return -1;

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

  512.     mxf->metadata_sets_count++;

  513.     return 0;

  514. }

  515. 

  516. static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  517. {

  518.     MXFCryptoContext *cryptocontext = arg;

  519.     if (size != 16)

  520.         return -1;

  521.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

  522.         avio_read(pb, cryptocontext->source_container_ul, 16);

  523.     return 0;

  524. }

  525. 

  526. static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  527. {

  528.     MXFContext *mxf = arg;

  529.     switch (tag) {

  530.     case 0x1901:

  531.         mxf->packages_count = avio_rb32(pb);

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

  533.             return -1;

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

  535.         if (!mxf->packages_refs)

  536.             return -1;

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

  538.         avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));

  539.         break;

  540.     }

  541.     return 0;

  542. }

  543. 

  544. static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  545. {

  546.     MXFStructuralComponent *source_clip = arg;

  547.     switch(tag) {

  548.     case 0x0202:

  549.         source_clip->duration = avio_rb64(pb);

  550.         break;

  551.     case 0x1201:

  552.         source_clip->start_position = avio_rb64(pb);

  553.         break;

  554.     case 0x1101:

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

  556.         avio_skip(pb, 16);

  557.         avio_read(pb, source_clip->source_package_uid, 16);

  558.         break;

  559.     case 0x1102:

  560.         source_clip->source_track_id = avio_rb32(pb);

  561.         break;

  562.     }

  563.     return 0;

  564. }

  565. 

  566. static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  567. {

  568.     MXFPackage *package = arg;

  569.     switch(tag) {

  570.     case 0x4403:

  571.         package->tracks_count = avio_rb32(pb);

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

  573.             return -1;

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

  575.         if (!package->tracks_refs)

  576.             return -1;

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

  578.         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  579.         break;

  580.     }

  581.     return 0;

  582. }

  583. 

  584. static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  585. {

  586.     MXFTrack *track = arg;

  587.     switch(tag) {

  588.     case 0x4801:

  589.         track->track_id = avio_rb32(pb);

  590.         break;

  591.     case 0x4804:

  592.         avio_read(pb, track->track_number, 4);

  593.         break;

  594.     case 0x4B01:

  595.         track->edit_rate.den = avio_rb32(pb);

  596.         track->edit_rate.num = avio_rb32(pb);

  597.         break;

  598.     case 0x4803:

  599.         avio_read(pb, track->sequence_ref, 16);

  600.         break;

  601.     }

  602.     return 0;

  603. }

  604. 

  605. static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  606. {

  607.     MXFSequence *sequence = arg;

  608.     switch(tag) {

  609.     case 0x0202:

  610.         sequence->duration = avio_rb64(pb);

  611.         break;

  612.     case 0x0201:

  613.         avio_read(pb, sequence->data_definition_ul, 16);

  614.         break;

  615.     case 0x1001:

  616.         sequence->structural_components_count = avio_rb32(pb);

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

  618.             return -1;

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

  620.         if (!sequence->structural_components_refs)

  621.             return -1;

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

  623.         avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));

  624.         break;

  625.     }

  626.     return 0;

  627. }

  628. 

  629. static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  630. {

  631.     MXFPackage *package = arg;

  632.     switch(tag) {

  633.     case 0x4403:

  634.         package->tracks_count = avio_rb32(pb);

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

  636.             return -1;

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

  638.         if (!package->tracks_refs)

  639.             return -1;

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

  641.         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  642.         break;

  643.     case 0x4401:

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

  645.         avio_skip(pb, 16);

  646.         avio_read(pb, package->package_uid, 16);

  647.         break;

  648.     case 0x4701:

  649.         avio_read(pb, package->descriptor_ref, 16);

  650.         break;

  651.     }

  652.     return 0;

  653. }

  654. 

  655. static int mxf_read_delta_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)

  656. {

  657.     int i, length;

  658. 

  659.     segment->nb_delta_entries = avio_rb32(pb);

  660.     length = avio_rb32(pb);

  661. 

  662.     if (!(segment->slice         = av_calloc(segment->nb_delta_entries, sizeof(*segment->slice))) ||

  663.         !(segment->element_delta = av_calloc(segment->nb_delta_entries, sizeof(*segment->element_delta))))

  664.         return AVERROR(ENOMEM);

  665. 

  666.     for (i = 0; i < segment->nb_delta_entries; i++) {

  667.         avio_r8(pb);    /* PosTableIndex */

  668.         segment->slice[i] = avio_r8(pb);

  669.         segment->element_delta[i] = avio_rb32(pb);

  670.     }

  671.     return 0;

  672. }

  673. 

  674. static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)

  675. {

  676.     int i, j, length;

  677. 

  678.     segment->nb_index_entries = avio_rb32(pb);

  679.     length = avio_rb32(pb);

  680. 

  681.     if (!(segment->flag_entries          = av_calloc(segment->nb_index_entries, sizeof(*segment->flag_entries))) ||

  682.         !(segment->stream_offset_entries = av_calloc(segment->nb_index_entries, sizeof(*segment->stream_offset_entries))))

  683.         return AVERROR(ENOMEM);

  684. 

  685.     if (segment->slice_count &&

  686.         !(segment->slice_offset_entries  = av_calloc(segment->nb_index_entries, sizeof(*segment->slice_offset_entries))))

  687.         return AVERROR(ENOMEM);

  688. 

  689.     for (i = 0; i < segment->nb_index_entries; i++) {

  690.         avio_rb16(pb);  /* TemporalOffset and KeyFrameOffset */

  691.         segment->flag_entries[i] = avio_r8(pb);

  692.         segment->stream_offset_entries[i] = avio_rb64(pb);

  693.         if (segment->slice_count) {

  694.             if (!(segment->slice_offset_entries[i] = av_calloc(segment->slice_count, sizeof(**segment->slice_offset_entries))))

  695.                 return AVERROR(ENOMEM);

  696. 

  697.             for (j = 0; j < segment->slice_count; j++)

  698.                 segment->slice_offset_entries[i][j] = avio_rb32(pb);

  699.         }

  700. 

  701.         avio_skip(pb, length - 11 - 4 * segment->slice_count);

  702.     }

  703.     return 0;

  704. }

  705. 

  706. static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  707. {

  708.     MXFIndexTableSegment *segment = arg;

  709.     switch(tag) {

  710.     case 0x3F05:

  711.         segment->edit_unit_byte_count = avio_rb32(pb);

  712.         av_dlog(NULL, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);

  713.         break;

  714.     case 0x3F06:

  715.         segment->index_sid = avio_rb32(pb);

  716.         av_dlog(NULL, "IndexSID %d\n", segment->index_sid);

  717.         break;

  718.     case 0x3F07:

  719.         segment->body_sid = avio_rb32(pb);

  720.         av_dlog(NULL, "BodySID %d\n", segment->body_sid);

  721.         break;

  722.     case 0x3F08:

  723.         segment->slice_count = avio_r8(pb);

  724.         av_dlog(NULL, "SliceCount %d\n", segment->slice_count);

  725.         break;

  726.     case 0x3F09:

  727.         av_dlog(NULL, "DeltaEntryArray found\n");

  728.         return mxf_read_delta_entry_array(pb, segment);

  729.     case 0x3F0A:

  730.         av_dlog(NULL, "IndexEntryArray found\n");

  731.         return mxf_read_index_entry_array(pb, segment);

  732.     case 0x3F0B:

  733.         segment->index_edit_rate.num = avio_rb32(pb);

  734.         segment->index_edit_rate.den = avio_rb32(pb);

  735.         av_dlog(NULL, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,

  736.                 segment->index_edit_rate.den);

  737.         break;

  738.     case 0x3F0C:

  739.         segment->index_start_position = avio_rb64(pb);

  740.         av_dlog(NULL, "IndexStartPosition %"PRId64"\n", segment->index_start_position);

  741.         break;

  742.     case 0x3F0D:

  743.         segment->index_duration = avio_rb64(pb);

  744.         av_dlog(NULL, "IndexDuration %"PRId64"\n", segment->index_duration);

  745.         break;

  746.     }

  747.     return 0;

  748. }

  749. 

  750. static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)

  751. {

  752.     int code, value, ofs = 0;

  753.     char layout[16] = {0};

  754. 

  755.     do {

  756.         code = avio_r8(pb);

  757.         value = avio_r8(pb);

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

  759. 

  760.         if (ofs < 16) {

  761.             layout[ofs++] = code;

  762.             layout[ofs++] = value;

  763.         }

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

  765. 

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

  767. }

  768. 

  769. static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  770. {

  771.     MXFDescriptor *descriptor = arg;

  772.     switch(tag) {

  773.     case 0x3F01:

  774.         descriptor->sub_descriptors_count = avio_rb32(pb);

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

  776.             return -1;

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

  778.         if (!descriptor->sub_descriptors_refs)

  779.             return -1;

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

  781.         avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));

  782.         break;

  783.     case 0x3004:

  784.         avio_read(pb, descriptor->essence_container_ul, 16);

  785.         break;

  786.     case 0x3006:

  787.         descriptor->linked_track_id = avio_rb32(pb);

  788.         break;

  789.     case 0x3201: /* PictureEssenceCoding */

  790.         avio_read(pb, descriptor->essence_codec_ul, 16);

  791.         break;

  792.     case 0x3203:

  793.         descriptor->width = avio_rb32(pb);

  794.         break;

  795.     case 0x3202:

  796.         descriptor->height = avio_rb32(pb);

  797.         break;

  798.     case 0x320E:

  799.         descriptor->aspect_ratio.num = avio_rb32(pb);

  800.         descriptor->aspect_ratio.den = avio_rb32(pb);

  801.         break;

  802.     case 0x3D03:

  803.         descriptor->sample_rate.num = avio_rb32(pb);

  804.         descriptor->sample_rate.den = avio_rb32(pb);

  805.         break;

  806.     case 0x3D06: /* SoundEssenceCompression */

  807.         avio_read(pb, descriptor->essence_codec_ul, 16);

  808.         break;

  809.     case 0x3D07:

  810.         descriptor->channels = avio_rb32(pb);

  811.         break;

  812.     case 0x3D01:

  813.         descriptor->bits_per_sample = avio_rb32(pb);

  814.         break;

  815.     case 0x3401:

  816.         mxf_read_pixel_layout(pb, descriptor);

  817.         break;

  818.     default:

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

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

  821.             descriptor->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  822.             if (!descriptor->extradata)

  823.                 return -1;

  824.             descriptor->extradata_size = size;

  825.             avio_read(pb, descriptor->extradata, size);

  826.         }

  827.         break;

  828.     }

  829.     return 0;

  830. }

  831. 

  832. /*

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

  834.  * Returns: boolean

  835.  */

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

  837. {

  838.     int i;

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

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

  841.             return 0;

  842.     }

  843.     return 1;

  844. }

  845. 

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

  847. {

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

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

  850.             break;

  851.         uls++;

  852.     }

  853.     return uls;

  854. }

  855. 

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

  857. {

  858.     int i;

  859. 

  860.     if (!strong_ref)

  861.         return NULL;

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

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

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

  865.             return mxf->metadata_sets[i];

  866.         }

  867.     }

  868.     return NULL;

  869. }

  870. 

  871. static const MXFCodecUL mxf_essence_container_uls[] = {

  872.     // video essence container uls

  873.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  874.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  875.     // sound essence container uls

  876.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  877.     { { 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 */

  878.     { { 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 */

  879.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  880. };

  881. 

  882. static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)

  883. {

  884.     int i, j, nb_segments = 0;

  885.     MXFIndexTableSegment **unsorted_segments;

  886.     int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;

  887. 

  888.     /* count number of segments, allocate arrays and copy unsorted segments */

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

  890.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  891.             nb_segments++;

  892. 

  893.     if (!(unsorted_segments = av_calloc(nb_segments, sizeof(*unsorted_segments))) ||

  894.         !(*sorted_segments  = av_calloc(nb_segments, sizeof(**sorted_segments)))) {

  895.         av_free(unsorted_segments);

  896.         return AVERROR(ENOMEM);

  897.     }

  898. 

  899.     for (i = j = 0; i < mxf->metadata_sets_count; i++)

  900.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  901.             unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];

  902. 

  903.     *nb_sorted_segments = 0;

  904. 

  905.     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */

  906.     for (i = 0; i < nb_segments; i++) {

  907.         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;

  908. 

  909.         for (j = 0; j < nb_segments; j++) {

  910.             MXFIndexTableSegment *s = unsorted_segments[j];

  911. 

  912.             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.

  913.              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.

  914.              */

  915.             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&

  916.                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {

  917.                 best             = j;

  918.                 best_body_sid    = s->body_sid;

  919.                 best_index_sid   = s->index_sid;

  920.                 best_index_start = s->index_start_position;

  921.             }

  922.         }

  923. 

  924.         /* no suitable entry found -> we're done */

  925.         if (best == -1)

  926.             break;

  927. 

  928.         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];

  929.         last_body_sid    = best_body_sid;

  930.         last_index_sid   = best_index_sid;

  931.         last_index_start = best_index_start;

  932.     }

  933. 

  934.     av_free(unsorted_segments);

  935. 

  936.     return 0;

  937. }

  938. 

  939. static int mxf_parse_index(MXFContext *mxf, int i, AVStream *st)

  940. {

  941.     int64_t accumulated_offset = 0;

  942.     int j, k, ret, nb_sorted_segments;

  943.     MXFIndexTableSegment **sorted_segments;

  944. 

  945.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)))

  946.         return ret;

  947. 

  948.     for (j = 0; j < nb_sorted_segments; j++) {

  949.         int n_delta = i;

  950.         int duration, sample_duration = 1, last_sample_size = 0;

  951.         int64_t segment_size;

  952.         MXFIndexTableSegment *tableseg = sorted_segments[j];

  953. 

  954.         /* reset accumulated_offset on BodySID change */

  955.         if (j > 0 && tableseg->body_sid != sorted_segments[j-1]->body_sid)

  956.             accumulated_offset = 0;

  957. 

  958.         /* HACK: How to correctly link between streams and slices? */

  959.         if (i < mxf->system_item + st->index)

  960.             n_delta++;

  961.         if (n_delta >= tableseg->nb_delta_entries && st->index != 0)

  962.             continue;

  963.         duration = tableseg->index_duration > 0 ? tableseg->index_duration :

  964.             st->duration - st->nb_index_entries;

  965.         segment_size = tableseg->edit_unit_byte_count * duration;

  966.         /* check small EditUnitByteCount for audio */

  967.         if (tableseg->edit_unit_byte_count && tableseg->edit_unit_byte_count < 32

  968.             && !tableseg->index_duration) {

  969.             /* duration might be prime relative to the new sample_duration,

  970.              * which means we need to handle the last frame differently */

  971.             sample_duration = 8192;

  972.             last_sample_size = (duration % sample_duration) * tableseg->edit_unit_byte_count;

  973.             tableseg->edit_unit_byte_count *= sample_duration;

  974.             duration /= sample_duration;

  975.             if (last_sample_size) duration++;

  976.         }

  977. 

  978.         for (k = 0; k < duration; k++) {

  979.             int64_t pos;

  980.             int size, flags = 0;

  981. 

  982.             if (k < tableseg->nb_index_entries) {

  983.                 pos = tableseg->stream_offset_entries[k];

  984.                 if (n_delta < tableseg->nb_delta_entries) {

  985.                     if (n_delta < tableseg->nb_delta_entries - 1) {

  986.                         size =

  987.                             tableseg->slice_offset_entries[k][tableseg->slice[n_delta+1]-1] +

  988.                             tableseg->element_delta[n_delta+1] -

  989.                             tableseg->element_delta[n_delta];

  990.                         if (tableseg->slice[n_delta] > 0)

  991.                             size -= tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  992.                     } else if (k < duration - 1) {

  993.                         size = tableseg->stream_offset_entries[k+1] -

  994.                             tableseg->stream_offset_entries[k] -

  995.                             tableseg->slice_offset_entries[k][tableseg->slice[tableseg->nb_delta_entries-1]-1] -

  996.                             tableseg->element_delta[tableseg->nb_delta_entries-1];

  997.                     } else

  998.                         size = 0;

  999.                     if (tableseg->slice[n_delta] > 0)

  1000.                         pos += tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1001.                     pos += tableseg->element_delta[n_delta];

  1002.                 } else

  1003.                     size = 0;

  1004.                 flags = !(tableseg->flag_entries[k] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1005.             } else {

  1006.                 pos = (int64_t)k * tableseg->edit_unit_byte_count + accumulated_offset;

  1007.                 if (n_delta < tableseg->nb_delta_entries - 1)

  1008.                     size = tableseg->element_delta[n_delta+1] - tableseg->element_delta[n_delta];

  1009.                 else {

  1010.                     /* use smaller size for last sample if we should */

  1011.                     if (last_sample_size && k == duration - 1)

  1012.                         size = last_sample_size;

  1013.                     else

  1014.                         size = tableseg->edit_unit_byte_count;

  1015.                     if (tableseg->nb_delta_entries)

  1016.                         size -= tableseg->element_delta[tableseg->nb_delta_entries-1];

  1017.                 }

  1018.                 if (n_delta < tableseg->nb_delta_entries)

  1019.                     pos += tableseg->element_delta[n_delta];

  1020.                 flags = AVINDEX_KEYFRAME;

  1021.             }

  1022. 

  1023.             if (k > 0 && pos < mxf->first_essence_length && accumulated_offset == 0)

  1024.                 pos += mxf->first_essence_kl_length;

  1025. 

  1026.             pos += mxf->essence_offset;

  1027. 

  1028.             av_dlog(mxf->fc, "Stream %d IndexEntry %d n_Delta %d Offset %"PRIx64" Timestamp %"PRId64"\n",

  1029.                     st->index, st->nb_index_entries, n_delta, pos, sample_duration * st->nb_index_entries);

  1030. 

  1031.             if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)

  1032.                 return ret;

  1033.         }

  1034.         accumulated_offset += segment_size;

  1035.     }

  1036. 

  1037.     av_free(sorted_segments);

  1038. 

  1039.     return 0;

  1040. }

  1041. 

  1042. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1043. {

  1044.     MXFPackage *material_package = NULL;

  1045.     MXFPackage *temp_package = NULL;

  1046.     int i, j, k, ret;

  1047. 

  1048.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1049.     /* TODO: handle multiple material packages (OP3x) */

  1050.     for (i = 0; i < mxf->packages_count; i++) {

  1051.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1052.         if (material_package) break;

  1053.     }

  1054.     if (!material_package) {

  1055.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1056.         return -1;

  1057.     }

  1058. 

  1059.     for (i = 0; i < material_package->tracks_count; i++) {

  1060.         MXFPackage *source_package = NULL;

  1061.         MXFTrack *material_track = NULL;

  1062.         MXFTrack *source_track = NULL;

  1063.         MXFTrack *temp_track = NULL;

  1064.         MXFDescriptor *descriptor = NULL;

  1065.         MXFStructuralComponent *component = NULL;

  1066.         UID *essence_container_ul = NULL;

  1067.         const MXFCodecUL *codec_ul = NULL;

  1068.         const MXFCodecUL *container_ul = NULL;

  1069.         AVStream *st;

  1070. 

  1071.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1072.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1073.             continue;

  1074.         }

  1075. 

  1076.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1077.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1078.             continue;

  1079.         }

  1080. 

  1081.         /* TODO: handle multiple source clips */

  1082.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1083.             /* TODO: handle timecode component */

  1084.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1085.             if (!component)

  1086.                 continue;

  1087. 

  1088.             for (k = 0; k < mxf->packages_count; k++) {

  1089.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1090.                 if (!temp_package)

  1091.                     continue;

  1092.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1093.                     source_package = temp_package;

  1094.                     break;

  1095.                 }

  1096.             }

  1097.             if (!source_package) {

  1098.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);

  1099.                 break;

  1100.             }

  1101.             for (k = 0; k < source_package->tracks_count; k++) {

  1102.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1103.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1104.                     return -1;

  1105.                 }

  1106.                 if (temp_track->track_id == component->source_track_id) {

  1107.                     source_track = temp_track;

  1108.                     break;

  1109.                 }

  1110.             }

  1111.             if (!source_track) {

  1112.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1113.                 break;

  1114.             }

  1115.         }

  1116.         if (!source_track)

  1117.             continue;

  1118. 

  1119.         st = avformat_new_stream(mxf->fc, NULL);

  1120.         if (!st) {

  1121.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1122.             return -1;

  1123.         }

  1124.         st->id = source_track->track_id;

  1125.         st->priv_data = source_track;

  1126.         st->duration = component->duration;

  1127.         if (st->duration == -1)

  1128.             st->duration = AV_NOPTS_VALUE;

  1129.         st->start_time = component->start_position;

  1130.         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1131. 

  1132.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1133.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1134.             return -1;

  1135.         }

  1136. 

  1137.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1138.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1139.         st->codec->codec_type = codec_ul->id;

  1140. 

  1141.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1142.         if (source_package->descriptor) {

  1143.             if (source_package->descriptor->type == MultipleDescriptor) {

  1144.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1145.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1146. 

  1147.                     if (!sub_descriptor) {

  1148.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1149.                         continue;

  1150.                     }

  1151.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1152.                         descriptor = sub_descriptor;

  1153.                         break;

  1154.                     }

  1155.                 }

  1156.             } else if (source_package->descriptor->type == Descriptor)

  1157.                 descriptor = source_package->descriptor;

  1158.         }

  1159.         if (!descriptor) {

  1160.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1161.             continue;

  1162.         }

  1163.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1164.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1165.         essence_container_ul = &descriptor->essence_container_ul;

  1166.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1167.          * is not allowed according to s429-6, try to find correct information anyway */

  1168.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1169.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1170.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1171.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1172.                 if (metadata->type == CryptoContext) {

  1173.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1174.                     break;

  1175.                 }

  1176.             }

  1177.         }

  1178.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1179.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1180.         st->codec->codec_id = codec_ul->id;

  1181.         if (descriptor->extradata) {

  1182.             st->codec->extradata = descriptor->extradata;

  1183.             st->codec->extradata_size = descriptor->extradata_size;

  1184.         }

  1185.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1186.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  1187.             if (st->codec->codec_id == CODEC_ID_NONE)

  1188.                 st->codec->codec_id = container_ul->id;

  1189.             st->codec->width = descriptor->width;

  1190.             st->codec->height = descriptor->height;

  1191.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1192.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1193.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1194.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1195.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  1196.             if (st->codec->codec_id == CODEC_ID_NONE)

  1197.                 st->codec->codec_id = container_ul->id;

  1198.             st->codec->channels = descriptor->channels;

  1199.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1200.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1201.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1202.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1203.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1204.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1205.                 else if (descriptor->bits_per_sample == 32)

  1206.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1207.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1208.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1209.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1210.                 else if (descriptor->bits_per_sample == 32)

  1211.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1212.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1213.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1214.             }

  1215.         }

  1216.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1217.             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");

  1218.             st->need_parsing = AVSTREAM_PARSE_FULL;

  1219.         }

  1220. 

  1221.         if ((ret = mxf_parse_index(mxf, i, st)))

  1222.             return ret;

  1223.     }

  1224.     return 0;

  1225. }

  1226. 

  1227. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1228.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1229.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1230.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1231.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1232.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1233.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1234.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1235.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1236.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1237.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1238.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1239.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1240.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1241.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1242.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1243.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1244.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1245.     { { 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 */

  1246.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1247.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1248.     { { 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 */

  1249.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1250.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1251.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1252.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1253.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1254.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1255.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1256. };

  1257. 

  1258. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1259. {

  1260.     AVIOContext *pb = mxf->fc->pb;

  1261.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1262.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1263. 

  1264.     if (!ctx)

  1265.         return -1;

  1266.     while (avio_tell(pb) + 4 < klv_end) {

  1267.         int tag = avio_rb16(pb);

  1268.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1269.         uint64_t next = avio_tell(pb) + size;

  1270.         UID uid = {0};

  1271. 

  1272.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1273.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1274.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1275.             continue;

  1276.         }

  1277.         if (tag > 0x7FFF) { /* dynamic tag */

  1278.             int i;

  1279.             for (i = 0; i < mxf->local_tags_count; i++) {

  1280.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1281.                 if (local_tag == tag) {

  1282.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1283.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1284.                     PRINT_KEY(mxf->fc, "uid", uid);

  1285.                 }

  1286.             }

  1287.         }

  1288.         if (ctx_size && tag == 0x3C0A)

  1289.             avio_read(pb, ctx->uid, 16);

  1290.         else if (read_child(ctx, pb, tag, size, uid) < 0)

  1291.             return -1;

  1292. 

  1293.         avio_seek(pb, next, SEEK_SET);

  1294.     }

  1295.     if (ctx_size) ctx->type = type;

  1296.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1297. }

  1298. 

  1299. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1300. {

  1301.     MXFContext *mxf = s->priv_data;

  1302.     KLVPacket klv;

  1303. 

  1304.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1305.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1306.         return -1;

  1307.     }

  1308.     avio_seek(s->pb, -14, SEEK_CUR);

  1309.     mxf->fc = s;

  1310.     while (!url_feof(s->pb)) {

  1311.         const MXFMetadataReadTableEntry *metadata;

  1312. 

  1313.         if (klv_read_packet(&klv, s->pb) < 0)

  1314.             return -1;

  1315.         PRINT_KEY(s, "read header", klv.key);

  1316.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1317.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1318.             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  1319.             /* FIXME avoid seek */

  1320.             avio_seek(s->pb, klv.offset, SEEK_SET);

  1321.             break;

  1322.         }

  1323.         if (IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1324.             mxf->system_item = 1;

  1325.             avio_skip(s->pb, klv.length);

  1326.             continue;

  1327.         }

  1328. 

  1329.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1330.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1331.                 int res;

  1332.                 if (klv.key[5] == 0x53) {

  1333.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1334.                 } else {

  1335.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1336.                     res = metadata->read(mxf, s->pb, 0, 0, klv.key);

  1337.                     avio_seek(s->pb, next, SEEK_SET);

  1338.                 }

  1339.                 if (res < 0) {

  1340.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1341.                     return -1;

  1342.                 }

  1343.                 break;

  1344.             }

  1345.         }

  1346.         if (!metadata->read)

  1347.             avio_skip(s->pb, klv.length);

  1348.     }

  1349.     return mxf_parse_structural_metadata(mxf);

  1350. }

  1351. 

  1352. static int mxf_read_close(AVFormatContext *s)

  1353. {

  1354.     MXFContext *mxf = s->priv_data;

  1355.     MXFIndexTableSegment *seg;

  1356.     int i, j;

  1357. 

  1358.     av_freep(&mxf->packages_refs);

  1359. 

  1360.     for (i = 0; i < s->nb_streams; i++)

  1361.         s->streams[i]->priv_data = NULL;

  1362. 

  1363.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1364.         switch (mxf->metadata_sets[i]->type) {

  1365.         case MultipleDescriptor:

  1366.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1367.             break;

  1368.         case Sequence:

  1369.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1370.             break;

  1371.         case SourcePackage:

  1372.         case MaterialPackage:

  1373.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1374.             break;

  1375.         case IndexTableSegment:

  1376.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1377.             for (j = 0; j < seg->nb_index_entries; j++)

  1378.                 av_freep(&seg->slice_offset_entries[j]);

  1379.             av_freep(&seg->slice);

  1380.             av_freep(&seg->element_delta);

  1381.             av_freep(&seg->flag_entries);

  1382.             av_freep(&seg->stream_offset_entries);

  1383.             av_freep(&seg->slice_offset_entries);

  1384.             break;

  1385.         default:

  1386.             break;

  1387.         }

  1388.         av_freep(&mxf->metadata_sets[i]);

  1389.     }

  1390.     av_freep(&mxf->partitions);

  1391.     av_freep(&mxf->metadata_sets);

  1392.     av_freep(&mxf->aesc);

  1393.     av_freep(&mxf->local_tags);

  1394.     return 0;

  1395. }

  1396. 

  1397. static int mxf_probe(AVProbeData *p) {

  1398.     uint8_t *bufp = p->buf;

  1399.     uint8_t *end = p->buf + p->buf_size;

  1400. 

  1401.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1402.         return 0;

  1403. 

  1404.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1405.     end -= sizeof(mxf_header_partition_pack_key);

  1406.     for (; bufp < end; bufp++) {

  1407.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1408.             return AVPROBE_SCORE_MAX;

  1409.     }

  1410.     return 0;

  1411. }

  1412. 

  1413. /* rudimentary byte seek */

  1414. /* XXX: use MXF Index */

  1415. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1416. {

  1417.     AVStream *st = s->streams[stream_index];

  1418.     int64_t seconds;

  1419. 

  1420.     if (!s->bit_rate)

  1421.         return -1;

  1422.     if (sample_time < 0)

  1423.         sample_time = 0;

  1424.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1425.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1426.         return -1;

  1427.     ff_update_cur_dts(s, st, sample_time);

  1428.     return 0;

  1429. }

  1430. 

  1431. AVInputFormat ff_mxf_demuxer = {

  1432.     .name           = "mxf",

  1433.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1434.     .priv_data_size = sizeof(MXFContext),

  1435.     .read_probe     = mxf_probe,

  1436.     .read_header    = mxf_read_header,

  1437.     .read_packet    = mxf_read_packet,

  1438.     .read_close     = mxf_read_close,

  1439.     .read_seek      = mxf_read_seek,

  1440. };