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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. } 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.     uint64_t footer_partition;

  170. } MXFContext;

  171. 

  172. enum MXFWrappingScheme {

  173.     Frame,

  174.     Clip,

  175. };

  176. 

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

  178. 

  179. typedef struct {

  180.     const UID key;

  181.     MXFMetadataReadFunc *read;

  182.     int ctx_size;

  183.     enum MXFMetadataSetType type;

  184. } MXFMetadataReadTableEntry;

  185. 

  186. /* partial keys to match */

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

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

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

  190. /* complete keys to match */

  191. 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 };

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

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

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

  195. 

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

  197. 

  198. static int64_t klv_decode_ber_length(AVIOContext *pb)

  199. {

  200.     uint64_t size = avio_r8(pb);

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

  202.         int bytes_num = size & 0x7f;

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

  204.         if (bytes_num > 8)

  205.             return -1;

  206.         size = 0;

  207.         while (bytes_num--)

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

  209.     }

  210.     return size;

  211. }

  212. 

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

  214. {

  215.     int i, b;

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

  217.         b = avio_r8(pb);

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

  219.             i = 0;

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

  221.             i = -1;

  222.     }

  223.     return i == size;

  224. }

  225. 

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

  227. {

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

  229.         return -1;

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

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

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

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

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

  235. }

  236. 

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

  238. {

  239.     int i;

  240. 

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

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

  243.         /* SMPTE 379M 7.3 */

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

  245.             return i;

  246.     }

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

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

  249. }

  250. 

  251. /* XXX: use AVBitStreamFilter */

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

  253. {

  254.     const uint8_t *buf_ptr, *end_ptr;

  255.     uint8_t *data_ptr;

  256.     int i;

  257. 

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

  259.         return -1;

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

  261.     if (length < 0)

  262.         return length;

  263.     data_ptr = pkt->data;

  264.     end_ptr = pkt->data + length;

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

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

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

  268.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  271.             else

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

  273.         }

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

  275.     }

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

  277.     return 0;

  278. }

  279. 

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

  281. {

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

  283.     MXFContext *mxf = s->priv_data;

  284.     AVIOContext *pb = s->pb;

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

  286.     uint64_t size;

  287.     uint64_t orig_size;

  288.     uint64_t plaintext_size;

  289.     uint8_t ivec[16];

  290.     uint8_t tmpbuf[16];

  291.     int index;

  292. 

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

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

  295.         if (!mxf->aesc)

  296.             return -1;

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

  298.     }

  299.     // crypto context

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

  301.     // plaintext offset

  302.     klv_decode_ber_length(pb);

  303.     plaintext_size = avio_rb64(pb);

  304.     // source klv key

  305.     klv_decode_ber_length(pb);

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

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

  308.         return -1;

  309.     index = mxf_get_stream_index(s, klv);

  310.     if (index < 0)

  311.         return -1;

  312.     // source size

  313.     klv_decode_ber_length(pb);

  314.     orig_size = avio_rb64(pb);

  315.     if (orig_size < plaintext_size)

  316.         return -1;

  317.     // enc. code

  318.     size = klv_decode_ber_length(pb);

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

  320.         return -1;

  321.     avio_read(pb, ivec, 16);

  322.     avio_read(pb, tmpbuf, 16);

  323.     if (mxf->aesc)

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

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

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

  327.     size -= 32;

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

  329.     if (size < 0)

  330.         return size;

  331.     else if (size < plaintext_size)

  332.         return AVERROR_INVALIDDATA;

  333.     size -= plaintext_size;

  334.     if (mxf->aesc)

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

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

  337.     av_shrink_packet(pkt, orig_size);

  338.     pkt->stream_index = index;

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

  340.     return 0;

  341. }

  342. 

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

  344. {

  345.     KLVPacket klv;

  346. 

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

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

  349.             return -1;

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

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

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

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

  354.             if (res < 0) {

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

  356.                 return -1;

  357.             }

  358.             return 0;

  359.         }

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

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

  362.             if (index < 0) {

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

  364.                 goto skip;

  365.             }

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

  367.                 goto skip;

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

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

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

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

  372.                     return -1;

  373.                 }

  374.             } else {

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

  376.                 if (ret < 0)

  377.                     return ret;

  378.             }

  379.             pkt->stream_index = index;

  380.             pkt->pos = klv.offset;

  381.             return 0;

  382.         } else

  383.         skip:

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

  385.     }

  386.     return AVERROR_EOF;

  387. }

  388. 

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

  390. {

  391.     MXFContext *mxf = arg;

  392.     int item_num = avio_rb32(pb);

  393.     int item_len = avio_rb32(pb);

  394. 

  395.     if (item_len != 18) {

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

  397.         return -1;

  398.     }

  399.     if (item_num > UINT_MAX / item_len)

  400.         return -1;

  401.     mxf->local_tags_count = item_num;

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

  403.     if (!mxf->local_tags)

  404.         return -1;

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

  406.     return 0;

  407. }

  408. 

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

  410. {

  411.     MXFContext *mxf = arg;

  412.     MXFPartition *partition;

  413.     UID op;

  414.     uint64_t footer_partition;

  415. 

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

  417.         return AVERROR(ENOMEM);

  418. 

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

  420.     if (!mxf->partitions)

  421.         return AVERROR(ENOMEM);

  422. 

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

  424. 

  425.     switch(uid[13]) {

  426.     case 2:

  427.         partition->type = Header;

  428.         break;

  429.     case 3:

  430.         partition->type = BodyPartition;

  431.         break;

  432.     case 4:

  433.         partition->type = Footer;

  434.         break;

  435.     default:

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

  437.         return AVERROR_INVALIDDATA;

  438.     }

  439. 

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

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

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

  443.     avio_skip(pb, 16);

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

  445.     footer_partition = avio_rb64(pb);

  446.     avio_skip(pb, 16);

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

  448.     avio_skip(pb, 8);

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

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

  451. 

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

  453.     if (footer_partition) {

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

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

  456.                    mxf->footer_partition, footer_partition);

  457.         } else {

  458.             mxf->footer_partition = footer_partition;

  459.         }

  460.     }

  461. 

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

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

  464.             partition->previous_partition, footer_partition,

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

  466. 

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

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

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

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

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

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

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

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

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

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

  477.     else

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

  479. 

  480.     return 0;

  481. }

  482. 

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

  484. {

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

  486.         return AVERROR(ENOMEM);

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

  488.     if (!mxf->metadata_sets)

  489.         return -1;

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

  491.     mxf->metadata_sets_count++;

  492.     return 0;

  493. }

  494. 

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

  496. {

  497.     MXFCryptoContext *cryptocontext = arg;

  498.     if (size != 16)

  499.         return -1;

  500.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  502.     return 0;

  503. }

  504. 

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

  506. {

  507.     MXFContext *mxf = arg;

  508.     switch (tag) {

  509.     case 0x1901:

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

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

  512.             return -1;

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

  514.         if (!mxf->packages_refs)

  515.             return -1;

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

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

  518.         break;

  519.     }

  520.     return 0;

  521. }

  522. 

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

  524. {

  525.     MXFStructuralComponent *source_clip = arg;

  526.     switch(tag) {

  527.     case 0x0202:

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

  529.         break;

  530.     case 0x1201:

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

  532.         break;

  533.     case 0x1101:

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

  535.         avio_skip(pb, 16);

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

  537.         break;

  538.     case 0x1102:

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

  540.         break;

  541.     }

  542.     return 0;

  543. }

  544. 

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

  546. {

  547.     MXFPackage *package = arg;

  548.     switch(tag) {

  549.     case 0x4403:

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

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

  552.             return -1;

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

  554.         if (!package->tracks_refs)

  555.             return -1;

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

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

  558.         break;

  559.     }

  560.     return 0;

  561. }

  562. 

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

  564. {

  565.     MXFTrack *track = arg;

  566.     switch(tag) {

  567.     case 0x4801:

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

  569.         break;

  570.     case 0x4804:

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

  572.         break;

  573.     case 0x4B01:

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

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

  576.         break;

  577.     case 0x4803:

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

  579.         break;

  580.     }

  581.     return 0;

  582. }

  583. 

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

  585. {

  586.     MXFSequence *sequence = arg;

  587.     switch(tag) {

  588.     case 0x0202:

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

  590.         break;

  591.     case 0x0201:

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

  593.         break;

  594.     case 0x1001:

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

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

  597.             return -1;

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

  599.         if (!sequence->structural_components_refs)

  600.             return -1;

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

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

  603.         break;

  604.     }

  605.     return 0;

  606. }

  607. 

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

  609. {

  610.     MXFPackage *package = arg;

  611.     switch(tag) {

  612.     case 0x4403:

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

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

  615.             return -1;

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

  617.         if (!package->tracks_refs)

  618.             return -1;

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

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

  621.         break;

  622.     case 0x4401:

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

  624.         avio_skip(pb, 16);

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

  626.         break;

  627.     case 0x4701:

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

  629.         break;

  630.     }

  631.     return 0;

  632. }

  633. 

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

  635. {

  636.     switch(tag) {

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

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

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

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

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

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

  643.     }

  644.     return 0;

  645. }

  646. 

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

  648. {

  649.     int code, value, ofs = 0;

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

  651. 

  652.     do {

  653.         code = avio_r8(pb);

  654.         value = avio_r8(pb);

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

  656. 

  657.         if (ofs < 16) {

  658.             layout[ofs++] = code;

  659.             layout[ofs++] = value;

  660.         }

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

  662. 

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

  664. }

  665. 

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

  667. {

  668.     MXFDescriptor *descriptor = arg;

  669.     switch(tag) {

  670.     case 0x3F01:

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

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

  673.             return -1;

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

  675.         if (!descriptor->sub_descriptors_refs)

  676.             return -1;

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

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

  679.         break;

  680.     case 0x3004:

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

  682.         break;

  683.     case 0x3006:

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

  685.         break;

  686.     case 0x3201: /* PictureEssenceCoding */

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

  688.         break;

  689.     case 0x3203:

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

  691.         break;

  692.     case 0x3202:

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

  694.         break;

  695.     case 0x320E:

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

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

  698.         break;

  699.     case 0x3D03:

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

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

  702.         break;

  703.     case 0x3D06: /* SoundEssenceCompression */

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

  705.         break;

  706.     case 0x3D07:

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

  708.         break;

  709.     case 0x3D01:

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

  711.         break;

  712.     case 0x3401:

  713.         mxf_read_pixel_layout(pb, descriptor);

  714.         break;

  715.     default:

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

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

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

  719.             if (!descriptor->extradata)

  720.                 return -1;

  721.             descriptor->extradata_size = size;

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

  723.         }

  724.         break;

  725.     }

  726.     return 0;

  727. }

  728. 

  729. /*

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

  731.  * Returns: boolean

  732.  */

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

  734. {

  735.     int i;

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

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

  738.             return 0;

  739.     }

  740.     return 1;

  741. }

  742. 

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

  744. {

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

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

  747.             break;

  748.         uls++;

  749.     }

  750.     return uls;

  751. }

  752. 

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

  754. {

  755.     int i;

  756. 

  757.     if (!strong_ref)

  758.         return NULL;

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

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

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

  762.             return mxf->metadata_sets[i];

  763.         }

  764.     }

  765.     return NULL;

  766. }

  767. 

  768. static const MXFCodecUL mxf_essence_container_uls[] = {

  769.     // video essence container uls

  770.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  771.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  772.     // sound essence container uls

  773.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  774.     { { 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 */

  775.     { { 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 */

  776.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  777. };

  778. 

  779. static int mxf_parse_structural_metadata(MXFContext *mxf)

  780. {

  781.     MXFPackage *material_package = NULL;

  782.     MXFPackage *temp_package = NULL;

  783.     int i, j, k;

  784. 

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

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

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

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

  789.         if (material_package) break;

  790.     }

  791.     if (!material_package) {

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

  793.         return -1;

  794.     }

  795. 

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

  797.         MXFPackage *source_package = NULL;

  798.         MXFTrack *material_track = NULL;

  799.         MXFTrack *source_track = NULL;

  800.         MXFTrack *temp_track = NULL;

  801.         MXFDescriptor *descriptor = NULL;

  802.         MXFStructuralComponent *component = NULL;

  803.         UID *essence_container_ul = NULL;

  804.         const MXFCodecUL *codec_ul = NULL;

  805.         const MXFCodecUL *container_ul = NULL;

  806.         AVStream *st;

  807. 

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

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

  810.             continue;

  811.         }

  812. 

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

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

  815.             continue;

  816.         }

  817. 

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

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

  820.             /* TODO: handle timecode component */

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

  822.             if (!component)

  823.                 continue;

  824. 

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

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

  827.                 if (!temp_package)

  828.                     continue;

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

  830.                     source_package = temp_package;

  831.                     break;

  832.                 }

  833.             }

  834.             if (!source_package) {

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

  836.                 break;

  837.             }

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

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

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

  841.                     return -1;

  842.                 }

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

  844.                     source_track = temp_track;

  845.                     break;

  846.                 }

  847.             }

  848.             if (!source_track) {

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

  850.                 break;

  851.             }

  852.         }

  853.         if (!source_track)

  854.             continue;

  855. 

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

  857.         if (!st) {

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

  859.             return -1;

  860.         }

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

  862.         st->priv_data = source_track;

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

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

  865.             st->duration = AV_NOPTS_VALUE;

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

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

  868. 

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

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

  871.             return -1;

  872.         }

  873. 

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

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

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

  877. 

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

  879.         if (source_package->descriptor) {

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

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

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

  883. 

  884.                     if (!sub_descriptor) {

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

  886.                         continue;

  887.                     }

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

  889.                         descriptor = sub_descriptor;

  890.                         break;

  891.                     }

  892.                 }

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

  894.                 descriptor = source_package->descriptor;

  895.         }

  896.         if (!descriptor) {

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

  898.             continue;

  899.         }

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

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

  902.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  911.                     break;

  912.                 }

  913.             }

  914.         }

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

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

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

  918.         if (descriptor->extradata) {

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

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

  921.         }

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

  923.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

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

  930.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  932.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  938.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  950.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  951.             }

  952.         }

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

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

  955.             st->need_parsing = AVSTREAM_PARSE_FULL;

  956.         }

  957.     }

  958.     return 0;

  959. }

  960. 

  961. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  962.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  963.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  964.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  965.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  966.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  967.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  968.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  969.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  970.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  971.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  972.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  973.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  974.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  975.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  976.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  977.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  978.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  979.     { { 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 */

  980.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  981.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  982.     { { 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 */

  983.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  984.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  985.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  986.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  987.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  988.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  989.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  990. };

  991. 

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

  993. {

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

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

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

  997. 

  998.     if (!ctx)

  999.         return -1;

  1000.     while (avio_tell(pb) + 4 < klv_end) {

  1001.         int tag = avio_rb16(pb);

  1002.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1003.         uint64_t next = avio_tell(pb) + size;

  1004.         UID uid = {0};

  1005. 

  1006.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1007.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1008.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1009.             continue;

  1010.         }

  1011.         if (tag > 0x7FFF) { /* dynamic tag */

  1012.             int i;

  1013.             for (i = 0; i < mxf->local_tags_count; i++) {

  1014.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1015.                 if (local_tag == tag) {

  1016.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1017.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1018.                     PRINT_KEY(mxf->fc, "uid", uid);

  1019.                 }

  1020.             }

  1021.         }

  1022.         if (ctx_size && tag == 0x3C0A)

  1023.             avio_read(pb, ctx->uid, 16);

  1024.         else if (read_child(ctx, pb, tag, size, uid) < 0)

  1025.             return -1;

  1026. 

  1027.         avio_seek(pb, next, SEEK_SET);

  1028.     }

  1029.     if (ctx_size) ctx->type = type;

  1030.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1031. }

  1032. 

  1033. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1034. {

  1035.     MXFContext *mxf = s->priv_data;

  1036.     KLVPacket klv;

  1037. 

  1038.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1039.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1040.         return -1;

  1041.     }

  1042.     avio_seek(s->pb, -14, SEEK_CUR);

  1043.     mxf->fc = s;

  1044.     while (!url_feof(s->pb)) {

  1045.         const MXFMetadataReadTableEntry *metadata;

  1046. 

  1047.         if (klv_read_packet(&klv, s->pb) < 0)

  1048.             return -1;

  1049.         PRINT_KEY(s, "read header", klv.key);

  1050.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1051.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1052.             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  1053.             /* FIXME avoid seek */

  1054.             avio_seek(s->pb, klv.offset, SEEK_SET);

  1055.             break;

  1056.         }

  1057. 

  1058.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1059.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1060.                 int res;

  1061.                 if (klv.key[5] == 0x53) {

  1062.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1063.                 } else {

  1064.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1065.                     res = metadata->read(mxf, s->pb, 0, 0, klv.key);

  1066.                     avio_seek(s->pb, next, SEEK_SET);

  1067.                 }

  1068.                 if (res < 0) {

  1069.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1070.                     return -1;

  1071.                 }

  1072.                 break;

  1073.             }

  1074.         }

  1075.         if (!metadata->read)

  1076.             avio_skip(s->pb, klv.length);

  1077.     }

  1078.     return mxf_parse_structural_metadata(mxf);

  1079. }

  1080. 

  1081. static int mxf_read_close(AVFormatContext *s)

  1082. {

  1083.     MXFContext *mxf = s->priv_data;

  1084.     int i;

  1085. 

  1086.     av_freep(&mxf->packages_refs);

  1087. 

  1088.     for (i = 0; i < s->nb_streams; i++)

  1089.         s->streams[i]->priv_data = NULL;

  1090. 

  1091.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1092.         switch (mxf->metadata_sets[i]->type) {

  1093.         case MultipleDescriptor:

  1094.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1095.             break;

  1096.         case Sequence:

  1097.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1098.             break;

  1099.         case SourcePackage:

  1100.         case MaterialPackage:

  1101.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1102.             break;

  1103.         default:

  1104.             break;

  1105.         }

  1106.         av_freep(&mxf->metadata_sets[i]);

  1107.     }

  1108.     av_freep(&mxf->partitions);

  1109.     av_freep(&mxf->metadata_sets);

  1110.     av_freep(&mxf->aesc);

  1111.     av_freep(&mxf->local_tags);

  1112.     return 0;

  1113. }

  1114. 

  1115. static int mxf_probe(AVProbeData *p) {

  1116.     uint8_t *bufp = p->buf;

  1117.     uint8_t *end = p->buf + p->buf_size;

  1118. 

  1119.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1120.         return 0;

  1121. 

  1122.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1123.     end -= sizeof(mxf_header_partition_pack_key);

  1124.     for (; bufp < end; bufp++) {

  1125.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1126.             return AVPROBE_SCORE_MAX;

  1127.     }

  1128.     return 0;

  1129. }

  1130. 

  1131. /* rudimentary byte seek */

  1132. /* XXX: use MXF Index */

  1133. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1134. {

  1135.     AVStream *st = s->streams[stream_index];

  1136.     int64_t seconds;

  1137. 

  1138.     if (!s->bit_rate)

  1139.         return -1;

  1140.     if (sample_time < 0)

  1141.         sample_time = 0;

  1142.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1143.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1144.         return -1;

  1145.     ff_update_cur_dts(s, st, sample_time);

  1146.     return 0;

  1147. }

  1148. 

  1149. AVInputFormat ff_mxf_demuxer = {

  1150.     .name           = "mxf",

  1151.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1152.     .priv_data_size = sizeof(MXFContext),

  1153.     .read_probe     = mxf_probe,

  1154.     .read_header    = mxf_read_header,

  1155.     .read_packet    = mxf_read_packet,

  1156.     .read_close     = mxf_read_close,

  1157.     .read_seek      = mxf_read_seek,

  1158. };