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.
34114 Commits
32 Branches
296MB
Tree: 23040e2e3d
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '23040e2e3d'
${ noResults }
FFmpeg/libavformat/mxfdec.c

1158 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.     int index_sid;

  79.     int body_sid;

  80. } MXFPartition;

  81. 

  82. typedef struct {

  83.     UID uid;

  84.     enum MXFMetadataSetType type;

  85.     UID source_container_ul;

  86. } MXFCryptoContext;

  87. 

  88. typedef struct {

  89.     UID uid;

  90.     enum MXFMetadataSetType type;

  91.     UID source_package_uid;

  92.     UID data_definition_ul;

  93.     int64_t duration;

  94.     int64_t start_position;

  95.     int source_track_id;

  96. } MXFStructuralComponent;

  97. 

  98. typedef struct {

  99.     UID uid;

  100.     enum MXFMetadataSetType type;

  101.     UID data_definition_ul;

  102.     UID *structural_components_refs;

  103.     int structural_components_count;

  104.     int64_t duration;

  105. } MXFSequence;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

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

  111.     UID sequence_ref;

  112.     int track_id;

  113.     uint8_t track_number[4];

  114.     AVRational edit_rate;

  115. } MXFTrack;

  116. 

  117. typedef struct {

  118.     UID uid;

  119.     enum MXFMetadataSetType type;

  120.     UID essence_container_ul;

  121.     UID essence_codec_ul;

  122.     AVRational sample_rate;

  123.     AVRational aspect_ratio;

  124.     int width;

  125.     int height;

  126.     int channels;

  127.     int bits_per_sample;

  128.     UID *sub_descriptors_refs;

  129.     int sub_descriptors_count;

  130.     int linked_track_id;

  131.     uint8_t *extradata;

  132.     int extradata_size;

  133.     enum PixelFormat pix_fmt;

  134. } MXFDescriptor;

  135. 

  136. typedef struct {

  137.     UID uid;

  138.     enum MXFMetadataSetType type;

  139. } MXFIndexTableSegment;

  140. 

  141. typedef struct {

  142.     UID uid;

  143.     enum MXFMetadataSetType type;

  144.     UID package_uid;

  145.     UID *tracks_refs;

  146.     int tracks_count;

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

  148.     UID descriptor_ref;

  149. } MXFPackage;

  150. 

  151. typedef struct {

  152.     UID uid;

  153.     enum MXFMetadataSetType type;

  154. } MXFMetadataSet;

  155. 

  156. typedef struct {

  157.     MXFPartition *partitions;

  158.     unsigned partitions_count;

  159.     MXFOP op;

  160.     UID *packages_refs;

  161.     int packages_count;

  162.     MXFMetadataSet **metadata_sets;

  163.     int metadata_sets_count;

  164.     AVFormatContext *fc;

  165.     struct AVAES *aesc;

  166.     uint8_t *local_tags;

  167.     int local_tags_count;

  168.     uint64_t footer_partition;

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

  260.     if (length < 0)

  261.         return length;

  262.     data_ptr = pkt->data;

  263.     end_ptr = pkt->data + length;

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

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

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

  267.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  270.             else

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

  272.         }

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

  274.     }

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

  276.     return 0;

  277. }

  278. 

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

  280. {

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

  282.     MXFContext *mxf = s->priv_data;

  283.     AVIOContext *pb = s->pb;

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

  285.     uint64_t size;

  286.     uint64_t orig_size;

  287.     uint64_t plaintext_size;

  288.     uint8_t ivec[16];

  289.     uint8_t tmpbuf[16];

  290.     int index;

  291. 

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

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

  294.         if (!mxf->aesc)

  295.             return -1;

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

  297.     }

  298.     // crypto context

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

  300.     // plaintext offset

  301.     klv_decode_ber_length(pb);

  302.     plaintext_size = avio_rb64(pb);

  303.     // source klv key

  304.     klv_decode_ber_length(pb);

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

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

  307.         return -1;

  308.     index = mxf_get_stream_index(s, klv);

  309.     if (index < 0)

  310.         return -1;

  311.     // source size

  312.     klv_decode_ber_length(pb);

  313.     orig_size = avio_rb64(pb);

  314.     if (orig_size < plaintext_size)

  315.         return -1;

  316.     // enc. code

  317.     size = klv_decode_ber_length(pb);

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

  319.         return -1;

  320.     avio_read(pb, ivec, 16);

  321.     avio_read(pb, tmpbuf, 16);

  322.     if (mxf->aesc)

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

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

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

  326.     size -= 32;

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

  328.     if (size < 0)

  329.         return size;

  330.     else if (size < plaintext_size)

  331.         return AVERROR_INVALIDDATA;

  332.     size -= plaintext_size;

  333.     if (mxf->aesc)

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

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

  336.     av_shrink_packet(pkt, orig_size);

  337.     pkt->stream_index = index;

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

  339.     return 0;

  340. }

  341. 

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

  343. {

  344.     KLVPacket klv;

  345. 

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

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

  348.             return -1;

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

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

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

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

  353.             if (res < 0) {

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

  355.                 return -1;

  356.             }

  357.             return 0;

  358.         }

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

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

  361.             if (index < 0) {

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

  363.                 goto skip;

  364.             }

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

  366.                 goto skip;

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

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

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

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

  371.                     return -1;

  372.                 }

  373.             } else {

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

  375.                 if (ret < 0)

  376.                     return ret;

  377.             }

  378.             pkt->stream_index = index;

  379.             pkt->pos = klv.offset;

  380.             return 0;

  381.         } else

  382.         skip:

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

  384.     }

  385.     return AVERROR_EOF;

  386. }

  387. 

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

  389. {

  390.     MXFContext *mxf = arg;

  391.     int item_num = avio_rb32(pb);

  392.     int item_len = avio_rb32(pb);

  393. 

  394.     if (item_len != 18) {

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

  396.         return -1;

  397.     }

  398.     if (item_num > UINT_MAX / item_len)

  399.         return -1;

  400.     mxf->local_tags_count = item_num;

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

  402.     if (!mxf->local_tags)

  403.         return -1;

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

  405.     return 0;

  406. }

  407. 

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

  409. {

  410.     MXFContext *mxf = arg;

  411.     MXFPartition *partition;

  412.     UID op;

  413.     uint64_t footer_partition;

  414. 

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

  416.         return AVERROR(ENOMEM);

  417. 

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

  419.     if (!mxf->partitions)

  420.         return AVERROR(ENOMEM);

  421. 

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

  423. 

  424.     switch(uid[13]) {

  425.     case 2:

  426.         partition->type = Header;

  427.         break;

  428.     case 3:

  429.         partition->type = BodyPartition;

  430.         break;

  431.     case 4:

  432.         partition->type = Footer;

  433.         break;

  434.     default:

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

  436.         return AVERROR_INVALIDDATA;

  437.     }

  438. 

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

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

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

  442.     avio_skip(pb, 16);

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

  444.     footer_partition = avio_rb64(pb);

  445.     avio_skip(pb, 16);

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

  447.     avio_skip(pb, 8);

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

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

  450. 

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

  452.     if (footer_partition) {

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

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

  455.                    mxf->footer_partition, footer_partition);

  456.         } else {

  457.             mxf->footer_partition = footer_partition;

  458.         }

  459.     }

  460. 

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

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

  463.             partition->previous_partition, footer_partition,

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

  465. 

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

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

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

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

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

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

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

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

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

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

  476.     else

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

  478. 

  479.     return 0;

  480. }

  481. 

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

  483. {

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

  485.         return AVERROR(ENOMEM);

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

  487.     if (!mxf->metadata_sets)

  488.         return -1;

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

  490.     mxf->metadata_sets_count++;

  491.     return 0;

  492. }

  493. 

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

  495. {

  496.     MXFCryptoContext *cryptocontext = arg;

  497.     if (size != 16)

  498.         return -1;

  499.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     MXFContext *mxf = arg;

  507.     switch (tag) {

  508.     case 0x1901:

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

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

  511.             return -1;

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

  513.         if (!mxf->packages_refs)

  514.             return -1;

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

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

  517.         break;

  518.     }

  519.     return 0;

  520. }

  521. 

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

  523. {

  524.     MXFStructuralComponent *source_clip = arg;

  525.     switch(tag) {

  526.     case 0x0202:

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

  528.         break;

  529.     case 0x1201:

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

  531.         break;

  532.     case 0x1101:

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

  534.         avio_skip(pb, 16);

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

  536.         break;

  537.     case 0x1102:

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

  539.         break;

  540.     }

  541.     return 0;

  542. }

  543. 

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

  545. {

  546.     MXFPackage *package = arg;

  547.     switch(tag) {

  548.     case 0x4403:

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

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

  551.             return -1;

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

  553.         if (!package->tracks_refs)

  554.             return -1;

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

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

  557.         break;

  558.     }

  559.     return 0;

  560. }

  561. 

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

  563. {

  564.     MXFTrack *track = arg;

  565.     switch(tag) {

  566.     case 0x4801:

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

  568.         break;

  569.     case 0x4804:

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

  571.         break;

  572.     case 0x4B01:

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

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

  575.         break;

  576.     case 0x4803:

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

  578.         break;

  579.     }

  580.     return 0;

  581. }

  582. 

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

  584. {

  585.     MXFSequence *sequence = arg;

  586.     switch(tag) {

  587.     case 0x0202:

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

  589.         break;

  590.     case 0x0201:

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

  592.         break;

  593.     case 0x1001:

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

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

  596.             return -1;

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

  598.         if (!sequence->structural_components_refs)

  599.             return -1;

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

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

  602.         break;

  603.     }

  604.     return 0;

  605. }

  606. 

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

  608. {

  609.     MXFPackage *package = arg;

  610.     switch(tag) {

  611.     case 0x4403:

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

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

  614.             return -1;

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

  616.         if (!package->tracks_refs)

  617.             return -1;

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

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

  620.         break;

  621.     case 0x4401:

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

  623.         avio_skip(pb, 16);

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

  625.         break;

  626.     case 0x4701:

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

  628.         break;

  629.     }

  630.     return 0;

  631. }

  632. 

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

  634. {

  635.     switch(tag) {

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

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

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

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

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

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

  642.     }

  643.     return 0;

  644. }

  645. 

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

  647. {

  648.     int code, value, ofs = 0;

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

  650. 

  651.     do {

  652.         code = avio_r8(pb);

  653.         value = avio_r8(pb);

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

  655. 

  656.         if (ofs < 16) {

  657.             layout[ofs++] = code;

  658.             layout[ofs++] = value;

  659.         }

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

  661. 

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

  663. }

  664. 

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

  666. {

  667.     MXFDescriptor *descriptor = arg;

  668.     switch(tag) {

  669.     case 0x3F01:

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

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

  672.             return -1;

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

  674.         if (!descriptor->sub_descriptors_refs)

  675.             return -1;

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

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

  678.         break;

  679.     case 0x3004:

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

  681.         break;

  682.     case 0x3006:

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

  684.         break;

  685.     case 0x3201: /* PictureEssenceCoding */

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

  687.         break;

  688.     case 0x3203:

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

  690.         break;

  691.     case 0x3202:

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

  693.         break;

  694.     case 0x320E:

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

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

  697.         break;

  698.     case 0x3D03:

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

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

  701.         break;

  702.     case 0x3D06: /* SoundEssenceCompression */

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

  704.         break;

  705.     case 0x3D07:

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

  707.         break;

  708.     case 0x3D01:

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

  710.         break;

  711.     case 0x3401:

  712.         mxf_read_pixel_layout(pb, descriptor);

  713.         break;

  714.     default:

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

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

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

  718.             if (!descriptor->extradata)

  719.                 return -1;

  720.             descriptor->extradata_size = size;

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

  722.         }

  723.         break;

  724.     }

  725.     return 0;

  726. }

  727. 

  728. /*

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

  730.  * Returns: boolean

  731.  */

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

  733. {

  734.     int i;

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

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

  737.             return 0;

  738.     }

  739.     return 1;

  740. }

  741. 

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

  743. {

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

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

  746.             break;

  747.         uls++;

  748.     }

  749.     return uls;

  750. }

  751. 

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

  753. {

  754.     int i;

  755. 

  756.     if (!strong_ref)

  757.         return NULL;

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

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

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

  761.             return mxf->metadata_sets[i];

  762.         }

  763.     }

  764.     return NULL;

  765. }

  766. 

  767. static const MXFCodecUL mxf_essence_container_uls[] = {

  768.     // video essence container uls

  769.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  770.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  771.     // sound essence container uls

  772.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  773.     { { 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 */

  774.     { { 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 */

  775.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  776. };

  777. 

  778. static int mxf_parse_structural_metadata(MXFContext *mxf)

  779. {

  780.     MXFPackage *material_package = NULL;

  781.     MXFPackage *temp_package = NULL;

  782.     int i, j, k;

  783. 

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

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

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

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

  788.         if (material_package) break;

  789.     }

  790.     if (!material_package) {

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

  792.         return -1;

  793.     }

  794. 

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

  796.         MXFPackage *source_package = NULL;

  797.         MXFTrack *material_track = NULL;

  798.         MXFTrack *source_track = NULL;

  799.         MXFTrack *temp_track = NULL;

  800.         MXFDescriptor *descriptor = NULL;

  801.         MXFStructuralComponent *component = NULL;

  802.         UID *essence_container_ul = NULL;

  803.         const MXFCodecUL *codec_ul = NULL;

  804.         const MXFCodecUL *container_ul = NULL;

  805.         AVStream *st;

  806. 

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

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

  809.             continue;

  810.         }

  811. 

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

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

  814.             continue;

  815.         }

  816. 

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

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

  819.             /* TODO: handle timecode component */

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

  821.             if (!component)

  822.                 continue;

  823. 

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

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

  826.                 if (!temp_package)

  827.                     continue;

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

  829.                     source_package = temp_package;

  830.                     break;

  831.                 }

  832.             }

  833.             if (!source_package) {

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

  835.                 break;

  836.             }

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

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

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

  840.                     return -1;

  841.                 }

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

  843.                     source_track = temp_track;

  844.                     break;

  845.                 }

  846.             }

  847.             if (!source_track) {

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

  849.                 break;

  850.             }

  851.         }

  852.         if (!source_track)

  853.             continue;

  854. 

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

  856.         if (!st) {

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

  858.             return -1;

  859.         }

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

  861.         st->priv_data = source_track;

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

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

  864.             st->duration = AV_NOPTS_VALUE;

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

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

  867. 

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

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

  870.             return -1;

  871.         }

  872. 

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

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

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

  876. 

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

  878.         if (source_package->descriptor) {

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

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

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

  882. 

  883.                     if (!sub_descriptor) {

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

  885.                         continue;

  886.                     }

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

  888.                         descriptor = sub_descriptor;

  889.                         break;

  890.                     }

  891.                 }

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

  893.                 descriptor = source_package->descriptor;

  894.         }

  895.         if (!descriptor) {

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

  897.             continue;

  898.         }

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

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

  901.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  910.                     break;

  911.                 }

  912.             }

  913.         }

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

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

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

  917.         if (descriptor->extradata) {

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

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

  920.         }

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

  922.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

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

  929.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  931.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  937.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  949.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  950.             }

  951.         }

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

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

  954.             st->need_parsing = AVSTREAM_PARSE_FULL;

  955.         }

  956.     }

  957.     return 0;

  958. }

  959. 

  960. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  961.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

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

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

  964.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  965.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  966.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

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

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

  969.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

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

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

  972.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  973.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  974.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  975.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  976.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  977.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  978.     { { 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 */

  979.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  980.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  981.     { { 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 */

  982.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  983.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  984.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  985.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  986.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  987.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  988.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  989. };

  990. 

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

  992. {

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

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

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

  996. 

  997.     if (!ctx)

  998.         return -1;

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

  1000.         int tag = avio_rb16(pb);

  1001.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1002.         uint64_t next = avio_tell(pb) + size;

  1003.         UID uid = {0};

  1004. 

  1005.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1006.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1007.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1008.             continue;

  1009.         }

  1010.         if (tag > 0x7FFF) { /* dynamic tag */

  1011.             int i;

  1012.             for (i = 0; i < mxf->local_tags_count; i++) {

  1013.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1014.                 if (local_tag == tag) {

  1015.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1016.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1017.                     PRINT_KEY(mxf->fc, "uid", uid);

  1018.                 }

  1019.             }

  1020.         }

  1021.         if (ctx_size && tag == 0x3C0A)

  1022.             avio_read(pb, ctx->uid, 16);

  1023.         else if (read_child(ctx, pb, tag, size, uid) < 0)

  1024.             return -1;

  1025. 

  1026.         avio_seek(pb, next, SEEK_SET);

  1027.     }

  1028.     if (ctx_size) ctx->type = type;

  1029.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1030. }

  1031. 

  1032. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1033. {

  1034.     MXFContext *mxf = s->priv_data;

  1035.     KLVPacket klv;

  1036. 

  1037.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1038.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1039.         return -1;

  1040.     }

  1041.     avio_seek(s->pb, -14, SEEK_CUR);

  1042.     mxf->fc = s;

  1043.     while (!url_feof(s->pb)) {

  1044.         const MXFMetadataReadTableEntry *metadata;

  1045. 

  1046.         if (klv_read_packet(&klv, s->pb) < 0)

  1047.             return -1;

  1048.         PRINT_KEY(s, "read header", klv.key);

  1049.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1050.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1051.             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  1052.             /* FIXME avoid seek */

  1053.             avio_seek(s->pb, klv.offset, SEEK_SET);

  1054.             break;

  1055.         }

  1056. 

  1057.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1058.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1059.                 int res;

  1060.                 if (klv.key[5] == 0x53) {

  1061.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1062.                 } else {

  1063.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1064.                     res = metadata->read(mxf, s->pb, 0, 0, klv.key);

  1065.                     avio_seek(s->pb, next, SEEK_SET);

  1066.                 }

  1067.                 if (res < 0) {

  1068.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1069.                     return -1;

  1070.                 }

  1071.                 break;

  1072.             }

  1073.         }

  1074.         if (!metadata->read)

  1075.             avio_skip(s->pb, klv.length);

  1076.     }

  1077.     return mxf_parse_structural_metadata(mxf);

  1078. }

  1079. 

  1080. static int mxf_read_close(AVFormatContext *s)

  1081. {

  1082.     MXFContext *mxf = s->priv_data;

  1083.     int i;

  1084. 

  1085.     av_freep(&mxf->packages_refs);

  1086. 

  1087.     for (i = 0; i < s->nb_streams; i++)

  1088.         s->streams[i]->priv_data = NULL;

  1089. 

  1090.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1091.         switch (mxf->metadata_sets[i]->type) {

  1092.         case MultipleDescriptor:

  1093.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1094.             break;

  1095.         case Sequence:

  1096.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1097.             break;

  1098.         case SourcePackage:

  1099.         case MaterialPackage:

  1100.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1101.             break;

  1102.         default:

  1103.             break;

  1104.         }

  1105.         av_freep(&mxf->metadata_sets[i]);

  1106.     }

  1107.     av_freep(&mxf->partitions);

  1108.     av_freep(&mxf->metadata_sets);

  1109.     av_freep(&mxf->aesc);

  1110.     av_freep(&mxf->local_tags);

  1111.     return 0;

  1112. }

  1113. 

  1114. static int mxf_probe(AVProbeData *p) {

  1115.     uint8_t *bufp = p->buf;

  1116.     uint8_t *end = p->buf + p->buf_size;

  1117. 

  1118.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1119.         return 0;

  1120. 

  1121.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1122.     end -= sizeof(mxf_header_partition_pack_key);

  1123.     for (; bufp < end; bufp++) {

  1124.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1125.             return AVPROBE_SCORE_MAX;

  1126.     }

  1127.     return 0;

  1128. }

  1129. 

  1130. /* rudimentary byte seek */

  1131. /* XXX: use MXF Index */

  1132. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1133. {

  1134.     AVStream *st = s->streams[stream_index];

  1135.     int64_t seconds;

  1136. 

  1137.     if (!s->bit_rate)

  1138.         return -1;

  1139.     if (sample_time < 0)

  1140.         sample_time = 0;

  1141.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1142.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1143.         return -1;

  1144.     av_update_cur_dts(s, st, sample_time);

  1145.     return 0;

  1146. }

  1147. 

  1148. AVInputFormat ff_mxf_demuxer = {

  1149.     .name           = "mxf",

  1150.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1151.     .priv_data_size = sizeof(MXFContext),

  1152.     .read_probe     = mxf_probe,

  1153.     .read_header    = mxf_read_header,

  1154.     .read_packet    = mxf_read_packet,

  1155.     .read_close     = mxf_read_close,

  1156.     .read_seek      = mxf_read_seek,

  1157. };