falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
33469 Commits
32 Branches
283MB
Tree: 4b4a6ebd68
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '4b4a6ebd68'
${ noResults }
FFmpeg/libavformat/mxfdec.c

1138 lines
43KB
Raw Blame History 

  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 "mxf.h"

  53. 

  54. typedef enum {

  55.     Header,

  56.     BodyPartition,

  57.     Footer

  58. } MXFPartitionType;

  59. 

  60. typedef enum {

  61.     OP1a,

  62.     OP1b,

  63.     OP1c,

  64.     OP2a,

  65.     OP2b,

  66.     OP2c,

  67.     OP3a,

  68.     OP3b,

  69.     OP3c,

  70.     OPAtom,

  71. } MXFOP;

  72. 

  73. typedef struct {

  74.     int closed;

  75.     int complete;

  76.     MXFPartitionType type;

  77.     uint64_t previous_partition;

  78.     uint64_t footer_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. } MXFIndexTableSegment;

  141. 

  142. typedef struct {

  143.     UID uid;

  144.     enum MXFMetadataSetType type;

  145.     UID package_uid;

  146.     UID *tracks_refs;

  147.     int tracks_count;

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

  149.     UID descriptor_ref;

  150. } MXFPackage;

  151. 

  152. typedef struct {

  153.     UID uid;

  154.     enum MXFMetadataSetType type;

  155. } MXFMetadataSet;

  156. 

  157. typedef struct {

  158.     MXFPartition *partitions;

  159.     unsigned partitions_count;

  160.     MXFOP op;

  161.     UID *packages_refs;

  162.     int packages_count;

  163.     MXFMetadataSet **metadata_sets;

  164.     int metadata_sets_count;

  165.     AVFormatContext *fc;

  166.     struct AVAES *aesc;

  167.     uint8_t *local_tags;

  168.     int local_tags_count;

  169. } MXFContext;

  170. 

  171. enum MXFWrappingScheme {

  172.     Frame,

  173.     Clip,

  174. };

  175. 

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

  177. 

  178. typedef struct {

  179.     const UID key;

  180.     MXFMetadataReadFunc *read;

  181.     int ctx_size;

  182.     enum MXFMetadataSetType type;

  183. } MXFMetadataReadTableEntry;

  184. 

  185. /* partial keys to match */

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

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

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

  189. /* complete keys to match */

  190. 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 };

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

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

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

  194. 

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

  196. 

  197. static int64_t klv_decode_ber_length(AVIOContext *pb)

  198. {

  199.     uint64_t size = avio_r8(pb);

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

  201.         int bytes_num = size & 0x7f;

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

  203.         if (bytes_num > 8)

  204.             return -1;

  205.         size = 0;

  206.         while (bytes_num--)

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

  208.     }

  209.     return size;

  210. }

  211. 

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

  213. {

  214.     int i, b;

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

  216.         b = avio_r8(pb);

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

  218.             i = 0;

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

  220.             i = -1;

  221.     }

  222.     return i == size;

  223. }

  224. 

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

  226. {

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

  228.         return -1;

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

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

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

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

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

  234. }

  235. 

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

  237. {

  238.     int i;

  239. 

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

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

  242.         /* SMPTE 379M 7.3 */

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

  244.             return i;

  245.     }

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

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

  248. }

  249. 

  250. /* XXX: use AVBitStreamFilter */

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

  252. {

  253.     const uint8_t *buf_ptr, *end_ptr;

  254.     uint8_t *data_ptr;

  255.     int i;

  256. 

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

  258.         return -1;

  259.     av_new_packet(pkt, length);

  260.     avio_read(pb, pkt->data, length);

  261.     data_ptr = pkt->data;

  262.     end_ptr = pkt->data + length;

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

  264.     for (; buf_ptr < end_ptr; ) {

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

  266.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  269.             else

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

  271.         }

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

  273.     }

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

  275.     return 0;

  276. }

  277. 

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

  279. {

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

  281.     MXFContext *mxf = s->priv_data;

  282.     AVIOContext *pb = s->pb;

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

  284.     uint64_t size;

  285.     uint64_t orig_size;

  286.     uint64_t plaintext_size;

  287.     uint8_t ivec[16];

  288.     uint8_t tmpbuf[16];

  289.     int index;

  290. 

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

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

  293.         if (!mxf->aesc)

  294.             return -1;

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

  296.     }

  297.     // crypto context

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

  299.     // plaintext offset

  300.     klv_decode_ber_length(pb);

  301.     plaintext_size = avio_rb64(pb);

  302.     // source klv key

  303.     klv_decode_ber_length(pb);

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

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

  306.         return -1;

  307.     index = mxf_get_stream_index(s, klv);

  308.     if (index < 0)

  309.         return -1;

  310.     // source size

  311.     klv_decode_ber_length(pb);

  312.     orig_size = avio_rb64(pb);

  313.     if (orig_size < plaintext_size)

  314.         return -1;

  315.     // enc. code

  316.     size = klv_decode_ber_length(pb);

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

  318.         return -1;

  319.     avio_read(pb, ivec, 16);

  320.     avio_read(pb, tmpbuf, 16);

  321.     if (mxf->aesc)

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

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

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

  325.     size -= 32;

  326.     av_get_packet(pb, pkt, size);

  327.     size -= plaintext_size;

  328.     if (mxf->aesc)

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

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

  331.     pkt->size = orig_size;

  332.     pkt->stream_index = index;

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

  334.     return 0;

  335. }

  336. 

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

  338. {

  339.     KLVPacket klv;

  340. 

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

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

  343.             return -1;

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

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

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

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

  348.             if (res < 0) {

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

  350.                 return -1;

  351.             }

  352.             return 0;

  353.         }

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

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

  356.             if (index < 0) {

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

  358.                 goto skip;

  359.             }

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

  361.                 goto skip;

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

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

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

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

  366.                     return -1;

  367.                 }

  368.             } else

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

  370.             pkt->stream_index = index;

  371.             pkt->pos = klv.offset;

  372.             return 0;

  373.         } else

  374.         skip:

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

  376.     }

  377.     return AVERROR_EOF;

  378. }

  379. 

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

  381. {

  382.     MXFContext *mxf = arg;

  383.     int item_num = avio_rb32(pb);

  384.     int item_len = avio_rb32(pb);

  385. 

  386.     if (item_len != 18) {

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

  388.         return -1;

  389.     }

  390.     if (item_num > UINT_MAX / item_len)

  391.         return -1;

  392.     mxf->local_tags_count = item_num;

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

  394.     if (!mxf->local_tags)

  395.         return -1;

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

  397.     return 0;

  398. }

  399. 

  400. static int mxf_read_partition_pack(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  401. {

  402.     MXFContext *mxf = arg;

  403.     MXFPartition *partition;

  404.     UID op;

  405. 

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

  407.         return AVERROR(ENOMEM);

  408. 

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

  410.     if (!mxf->partitions)

  411.         return AVERROR(ENOMEM);

  412. 

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

  414. 

  415.     switch(uid[13]) {

  416.     case 2:

  417.         partition->type = Header;

  418.         break;

  419.     case 3:

  420.         partition->type = BodyPartition;

  421.         break;

  422.     case 4:

  423.         partition->type = Footer;

  424.         break;

  425.     default:

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

  427.         return AVERROR_INVALIDDATA;

  428.     }

  429. 

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

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

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

  433.     avio_skip(pb, 16);

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

  435.     partition->footer_partition = avio_rb64(pb);

  436.     avio_skip(pb, 16);

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

  438.     avio_skip(pb, 8);

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

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

  441. 

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

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

  444.             partition->previous_partition, partition->footer_partition,

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

  446. 

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

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

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

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

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

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

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

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

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

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

  457.     else

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

  459. 

  460.     return 0;

  461. }

  462. 

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

  464. {

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

  466.         return AVERROR(ENOMEM);

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

  468.     if (!mxf->metadata_sets)

  469.         return -1;

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

  471.     mxf->metadata_sets_count++;

  472.     return 0;

  473. }

  474. 

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

  476. {

  477.     MXFCryptoContext *cryptocontext = arg;

  478.     if (size != 16)

  479.         return -1;

  480.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  482.     return 0;

  483. }

  484. 

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

  486. {

  487.     MXFContext *mxf = arg;

  488.     switch (tag) {

  489.     case 0x1901:

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

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

  492.             return -1;

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

  494.         if (!mxf->packages_refs)

  495.             return -1;

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

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

  498.         break;

  499.     }

  500.     return 0;

  501. }

  502. 

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

  504. {

  505.     MXFStructuralComponent *source_clip = arg;

  506.     switch(tag) {

  507.     case 0x0202:

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

  509.         break;

  510.     case 0x1201:

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

  512.         break;

  513.     case 0x1101:

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

  515.         avio_skip(pb, 16);

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

  517.         break;

  518.     case 0x1102:

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

  520.         break;

  521.     }

  522.     return 0;

  523. }

  524. 

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

  526. {

  527.     MXFPackage *package = arg;

  528.     switch(tag) {

  529.     case 0x4403:

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

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

  532.             return -1;

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

  534.         if (!package->tracks_refs)

  535.             return -1;

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

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

  538.         break;

  539.     }

  540.     return 0;

  541. }

  542. 

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

  544. {

  545.     MXFTrack *track = arg;

  546.     switch(tag) {

  547.     case 0x4801:

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

  549.         break;

  550.     case 0x4804:

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

  552.         break;

  553.     case 0x4B01:

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

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

  556.         break;

  557.     case 0x4803:

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

  559.         break;

  560.     }

  561.     return 0;

  562. }

  563. 

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

  565. {

  566.     MXFSequence *sequence = arg;

  567.     switch(tag) {

  568.     case 0x0202:

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

  570.         break;

  571.     case 0x0201:

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

  573.         break;

  574.     case 0x1001:

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

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

  577.             return -1;

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

  579.         if (!sequence->structural_components_refs)

  580.             return -1;

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

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

  583.         break;

  584.     }

  585.     return 0;

  586. }

  587. 

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

  589. {

  590.     MXFPackage *package = arg;

  591.     switch(tag) {

  592.     case 0x4403:

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

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

  595.             return -1;

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

  597.         if (!package->tracks_refs)

  598.             return -1;

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

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

  601.         break;

  602.     case 0x4401:

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

  604.         avio_skip(pb, 16);

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

  606.         break;

  607.     case 0x4701:

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

  609.         break;

  610.     }

  611.     return 0;

  612. }

  613. 

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

  615. {

  616.     switch(tag) {

  617.     case 0x3F05: av_dlog(NULL, "EditUnitByteCount %d\n", avio_rb32(pb)); break;

  618.     case 0x3F06: av_dlog(NULL, "IndexSID %d\n", avio_rb32(pb)); break;

  619.     case 0x3F07: av_dlog(NULL, "BodySID %d\n", avio_rb32(pb)); break;

  620.     case 0x3F0B: av_dlog(NULL, "IndexEditRate %d/%d\n", avio_rb32(pb), avio_rb32(pb)); break;

  621.     case 0x3F0C: av_dlog(NULL, "IndexStartPosition %"PRIu64"\n", avio_rb64(pb)); break;

  622.     case 0x3F0D: av_dlog(NULL, "IndexDuration %"PRIu64"\n", avio_rb64(pb)); break;

  623.     }

  624.     return 0;

  625. }

  626. 

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

  628. {

  629.     int code, value, ofs = 0;

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

  631. 

  632.     do {

  633.         code = avio_r8(pb);

  634.         value = avio_r8(pb);

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

  636. 

  637.         if (ofs < 16) {

  638.             layout[ofs++] = code;

  639.             layout[ofs++] = value;

  640.         }

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

  642. 

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

  644. }

  645. 

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

  647. {

  648.     MXFDescriptor *descriptor = arg;

  649.     switch(tag) {

  650.     case 0x3F01:

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

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

  653.             return -1;

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

  655.         if (!descriptor->sub_descriptors_refs)

  656.             return -1;

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

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

  659.         break;

  660.     case 0x3004:

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

  662.         break;

  663.     case 0x3006:

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

  665.         break;

  666.     case 0x3201: /* PictureEssenceCoding */

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

  668.         break;

  669.     case 0x3203:

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

  671.         break;

  672.     case 0x3202:

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

  674.         break;

  675.     case 0x320E:

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

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

  678.         break;

  679.     case 0x3D03:

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

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

  682.         break;

  683.     case 0x3D06: /* SoundEssenceCompression */

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

  685.         break;

  686.     case 0x3D07:

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

  688.         break;

  689.     case 0x3D01:

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

  691.         break;

  692.     case 0x3401:

  693.         mxf_read_pixel_layout(pb, descriptor);

  694.         break;

  695.     default:

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

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

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

  699.             if (!descriptor->extradata)

  700.                 return -1;

  701.             descriptor->extradata_size = size;

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

  703.         }

  704.         break;

  705.     }

  706.     return 0;

  707. }

  708. 

  709. /*

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

  711.  * Returns: boolean

  712.  */

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

  714. {

  715.     int i;

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

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

  718.             return 0;

  719.     }

  720.     return 1;

  721. }

  722. 

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

  724. {

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

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

  727.             break;

  728.         uls++;

  729.     }

  730.     return uls;

  731. }

  732. 

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

  734. {

  735.     int i;

  736. 

  737.     if (!strong_ref)

  738.         return NULL;

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

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

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

  742.             return mxf->metadata_sets[i];

  743.         }

  744.     }

  745.     return NULL;

  746. }

  747. 

  748. static const MXFCodecUL mxf_essence_container_uls[] = {

  749.     // video essence container uls

  750.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  751.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  752.     // sound essence container uls

  753.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  754.     { { 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 */

  755.     { { 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 */

  756.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  757. };

  758. 

  759. static int mxf_parse_structural_metadata(MXFContext *mxf)

  760. {

  761.     MXFPackage *material_package = NULL;

  762.     MXFPackage *temp_package = NULL;

  763.     int i, j, k;

  764. 

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

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

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

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

  769.         if (material_package) break;

  770.     }

  771.     if (!material_package) {

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

  773.         return -1;

  774.     }

  775. 

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

  777.         MXFPackage *source_package = NULL;

  778.         MXFTrack *material_track = NULL;

  779.         MXFTrack *source_track = NULL;

  780.         MXFTrack *temp_track = NULL;

  781.         MXFDescriptor *descriptor = NULL;

  782.         MXFStructuralComponent *component = NULL;

  783.         UID *essence_container_ul = NULL;

  784.         const MXFCodecUL *codec_ul = NULL;

  785.         const MXFCodecUL *container_ul = NULL;

  786.         AVStream *st;

  787. 

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

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

  790.             continue;

  791.         }

  792. 

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

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

  795.             continue;

  796.         }

  797. 

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

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

  800.             /* TODO: handle timecode component */

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

  802.             if (!component)

  803.                 continue;

  804. 

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

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

  807.                 if (!temp_package)

  808.                     continue;

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

  810.                     source_package = temp_package;

  811.                     break;

  812.                 }

  813.             }

  814.             if (!source_package) {

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

  816.                 break;

  817.             }

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

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

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

  821.                     return -1;

  822.                 }

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

  824.                     source_track = temp_track;

  825.                     break;

  826.                 }

  827.             }

  828.             if (!source_track) {

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

  830.                 break;

  831.             }

  832.         }

  833.         if (!source_track)

  834.             continue;

  835. 

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

  837.         if (!st) {

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

  839.             return -1;

  840.         }

  841.         st->priv_data = source_track;

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

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

  844.             st->duration = AV_NOPTS_VALUE;

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

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

  847. 

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

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

  850.             return -1;

  851.         }

  852. 

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

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

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

  856. 

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

  858.         if (source_package->descriptor) {

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

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

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

  862. 

  863.                     if (!sub_descriptor) {

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

  865.                         continue;

  866.                     }

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

  868.                         descriptor = sub_descriptor;

  869.                         break;

  870.                     }

  871.                 }

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

  873.                 descriptor = source_package->descriptor;

  874.         }

  875.         if (!descriptor) {

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

  877.             continue;

  878.         }

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

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

  881.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  890.                     break;

  891.                 }

  892.             }

  893.         }

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

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

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

  897.         if (descriptor->extradata) {

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

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

  900.         }

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

  902.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

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

  909.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  911.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  917.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  929.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  930.             }

  931.         }

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

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

  934.             st->need_parsing = AVSTREAM_PARSE_FULL;

  935.         }

  936.     }

  937.     return 0;

  938. }

  939. 

  940. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  941.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  942.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  943.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  944.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  945.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  946.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  947.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  948.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  949.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  950.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  951.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  952.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  953.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  954.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  955.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  956.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  957.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  958.     { { 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 */

  959.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  960.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  961.     { { 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 */

  962.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  963.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  964.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  965.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  966.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  967.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  968.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  969. };

  970. 

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

  972. {

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

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

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

  976. 

  977.     if (!ctx)

  978.         return -1;

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

  980.         int tag = avio_rb16(pb);

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

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

  983.         UID uid = {0};

  984. 

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

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

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

  988.             continue;

  989.         }

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

  991.             int i;

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

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

  994.                 if (local_tag == tag) {

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

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

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

  998.                 }

  999.             }

  1000.         }

  1001.         if (ctx_size && tag == 0x3C0A)

  1002.             avio_read(pb, ctx->uid, 16);

  1003.         else if (read_child(ctx, pb, tag, size, uid) < 0)

  1004.             return -1;

  1005. 

  1006.         avio_seek(pb, next, SEEK_SET);

  1007.     }

  1008.     if (ctx_size) ctx->type = type;

  1009.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1010. }

  1011. 

  1012. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1013. {

  1014.     MXFContext *mxf = s->priv_data;

  1015.     KLVPacket klv;

  1016. 

  1017.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1018.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1019.         return -1;

  1020.     }

  1021.     avio_seek(s->pb, -14, SEEK_CUR);

  1022.     mxf->fc = s;

  1023.     while (!url_feof(s->pb)) {

  1024.         const MXFMetadataReadTableEntry *metadata;

  1025. 

  1026.         if (klv_read_packet(&klv, s->pb) < 0)

  1027.             return -1;

  1028.         PRINT_KEY(s, "read header", klv.key);

  1029.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1030.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1031.             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  1032.             /* FIXME avoid seek */

  1033.             avio_seek(s->pb, klv.offset, SEEK_SET);

  1034.             break;

  1035.         }

  1036. 

  1037.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1038.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1039.                 int res;

  1040.                 if (klv.key[5] == 0x53) {

  1041.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1042.                 } else {

  1043.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1044.                     res = metadata->read(mxf, s->pb, 0, 0, klv.key);

  1045.                     avio_seek(s->pb, next, SEEK_SET);

  1046.                 }

  1047.                 if (res < 0) {

  1048.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1049.                     return -1;

  1050.                 }

  1051.                 break;

  1052.             }

  1053.         }

  1054.         if (!metadata->read)

  1055.             avio_skip(s->pb, klv.length);

  1056.     }

  1057.     return mxf_parse_structural_metadata(mxf);

  1058. }

  1059. 

  1060. static int mxf_read_close(AVFormatContext *s)

  1061. {

  1062.     MXFContext *mxf = s->priv_data;

  1063.     int i;

  1064. 

  1065.     av_freep(&mxf->packages_refs);

  1066. 

  1067.     for (i = 0; i < s->nb_streams; i++)

  1068.         s->streams[i]->priv_data = NULL;

  1069. 

  1070.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1071.         switch (mxf->metadata_sets[i]->type) {

  1072.         case MultipleDescriptor:

  1073.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1074.             break;

  1075.         case Sequence:

  1076.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1077.             break;

  1078.         case SourcePackage:

  1079.         case MaterialPackage:

  1080.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1081.             break;

  1082.         default:

  1083.             break;

  1084.         }

  1085.         av_freep(&mxf->metadata_sets[i]);

  1086.     }

  1087.     av_freep(&mxf->partitions);

  1088.     av_freep(&mxf->metadata_sets);

  1089.     av_freep(&mxf->aesc);

  1090.     av_freep(&mxf->local_tags);

  1091.     return 0;

  1092. }

  1093. 

  1094. static int mxf_probe(AVProbeData *p) {

  1095.     uint8_t *bufp = p->buf;

  1096.     uint8_t *end = p->buf + p->buf_size;

  1097. 

  1098.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1099.         return 0;

  1100. 

  1101.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1102.     end -= sizeof(mxf_header_partition_pack_key);

  1103.     for (; bufp < end; bufp++) {

  1104.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1105.             return AVPROBE_SCORE_MAX;

  1106.     }

  1107.     return 0;

  1108. }

  1109. 

  1110. /* rudimentary byte seek */

  1111. /* XXX: use MXF Index */

  1112. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1113. {

  1114.     AVStream *st = s->streams[stream_index];

  1115.     int64_t seconds;

  1116. 

  1117.     if (!s->bit_rate)

  1118.         return -1;

  1119.     if (sample_time < 0)

  1120.         sample_time = 0;

  1121.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1122.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1123.         return -1;

  1124.     av_update_cur_dts(s, st, sample_time);

  1125.     return 0;

  1126. }

  1127. 

  1128. AVInputFormat ff_mxf_demuxer = {

  1129.     .name           = "mxf",

  1130.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1131.     .priv_data_size = sizeof(MXFContext),

  1132.     .read_probe     = mxf_probe,

  1133.     .read_header    = mxf_read_header,

  1134.     .read_packet    = mxf_read_packet,

  1135.     .read_close     = mxf_read_close,

  1136.     .read_seek      = mxf_read_seek,

  1137. };