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FFmpeg/libavformat/mxf.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 "avformat.h"

  49. #include "aes.h"

  50. #include "bytestream.h"

  51. 

  52. typedef uint8_t UID[16];

  53. 

  54. enum MXFMetadataSetType {

  55.     AnyType,

  56.     MaterialPackage,

  57.     SourcePackage,

  58.     SourceClip,

  59.     TimecodeComponent,

  60.     Sequence,

  61.     MultipleDescriptor,

  62.     Descriptor,

  63.     Track,

  64.     CryptoContext,

  65. };

  66. 

  67. typedef struct {

  68.     UID uid;

  69.     enum MXFMetadataSetType type;

  70.     UID source_container_ul;

  71. } MXFCryptoContext;

  72. 

  73. typedef struct {

  74.     UID uid;

  75.     enum MXFMetadataSetType type;

  76.     UID source_package_uid;

  77.     UID data_definition_ul;

  78.     int64_t duration;

  79.     int64_t start_position;

  80.     int source_track_id;

  81. } MXFStructuralComponent;

  82. 

  83. typedef struct {

  84.     UID uid;

  85.     enum MXFMetadataSetType type;

  86.     UID data_definition_ul;

  87.     UID *structural_components_refs;

  88.     int structural_components_count;

  89.     int64_t duration;

  90. } MXFSequence;

  91. 

  92. typedef struct {

  93.     UID uid;

  94.     enum MXFMetadataSetType type;

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

  96.     UID sequence_ref;

  97.     int track_id;

  98.     uint8_t track_number[4];

  99.     AVRational edit_rate;

  100. } MXFTrack;

  101. 

  102. typedef struct {

  103.     UID uid;

  104.     enum MXFMetadataSetType type;

  105.     UID essence_container_ul;

  106.     UID essence_codec_ul;

  107.     AVRational sample_rate;

  108.     AVRational aspect_ratio;

  109.     int width;

  110.     int height;

  111.     int channels;

  112.     int bits_per_sample;

  113.     UID *sub_descriptors_refs;

  114.     int sub_descriptors_count;

  115.     int linked_track_id;

  116.     uint8_t *extradata;

  117.     int extradata_size;

  118. } MXFDescriptor;

  119. 

  120. typedef struct {

  121.     UID uid;

  122.     enum MXFMetadataSetType type;

  123.     UID package_uid;

  124.     UID *tracks_refs;

  125.     int tracks_count;

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

  127.     UID descriptor_ref;

  128. } MXFPackage;

  129. 

  130. typedef struct {

  131.     UID uid;

  132.     enum MXFMetadataSetType type;

  133. } MXFMetadataSet;

  134. 

  135. typedef struct {

  136.     UID *packages_refs;

  137.     int packages_count;

  138.     MXFMetadataSet **metadata_sets;

  139.     int metadata_sets_count;

  140.     AVFormatContext *fc;

  141.     struct AVAES *aesc;

  142.     uint8_t *local_tags;

  143.     int local_tags_count;

  144. } MXFContext;

  145. 

  146. typedef struct {

  147.     UID key;

  148.     offset_t offset;

  149.     uint64_t length;

  150. } KLVPacket;

  151. 

  152. enum MXFWrappingScheme {

  153.     Frame,

  154.     Clip,

  155. };

  156. 

  157. typedef struct {

  158.     UID uid;

  159.     unsigned matching_len;

  160.     enum CodecID id;

  161. } MXFCodecUL;

  162. 

  163. typedef struct {

  164.     UID uid;

  165.     enum CodecType type;

  166. } MXFDataDefinitionUL;

  167. 

  168. typedef struct {

  169.     const UID key;

  170.     int (*read)();

  171.     int ctx_size;

  172.     enum MXFMetadataSetType type;

  173. } MXFMetadataReadTableEntry;

  174. 

  175. /* partial keys to match */

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

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

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

  179. /* complete keys to match */

  180. 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 };

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

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

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

  184. 

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

  186. 

  187. #define PRINT_KEY(pc, s, x) dprintf(pc, "%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \

  188.                              (x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15])

  189. 

  190. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  191. {

  192.     uint64_t size = get_byte(pb);

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

  194.         int bytes_num = size & 0x7f;

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

  196.         if (bytes_num > 8)

  197.             return -1;

  198.         size = 0;

  199.         while (bytes_num--)

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

  201.     }

  202.     return size;

  203. }

  204. 

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

  206. {

  207.     int i, b;

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

  209.         b = get_byte(pb);

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

  211.             i = 0;

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

  213.             i = -1;

  214.     }

  215.     return i == size;

  216. }

  217. 

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

  219. {

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

  221.         return -1;

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

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

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

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

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

  227. }

  228. 

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

  230. {

  231.     int i;

  232. 

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

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

  235.         /* SMPTE 379M 7.3 */

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

  237.             return i;

  238.     }

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

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

  241. }

  242. 

  243. /* XXX: use AVBitStreamFilter */

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

  245. {

  246.     uint8_t buffer[61444];

  247.     const uint8_t *buf_ptr, *end_ptr;

  248.     uint8_t *data_ptr;

  249.     int i;

  250. 

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

  252.         return -1;

  253.     get_buffer(pb, buffer, length);

  254.     av_new_packet(pkt, length);

  255.     data_ptr = pkt->data;

  256.     end_ptr = buffer + length;

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

  258.     for (; buf_ptr < end_ptr; ) {

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

  260.             uint32_t sample = bytestream_get_le32(&buf_ptr);

  261.             if (st->codec->bits_per_sample == 24)

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

  263.             else

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

  265.         }

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

  267.     }

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

  269.     return 0;

  270. }

  271. 

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

  273. {

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

  275.     MXFContext *mxf = s->priv_data;

  276.     ByteIOContext *pb = s->pb;

  277.     offset_t end = url_ftell(pb) + klv->length;

  278.     uint64_t size;

  279.     uint64_t orig_size;

  280.     uint64_t plaintext_size;

  281.     uint8_t ivec[16];

  282.     uint8_t tmpbuf[16];

  283.     int index;

  284. 

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

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

  287.         if (!mxf->aesc)

  288.             return -1;

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

  290.     }

  291.     // crypto context

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

  293.     // plaintext offset

  294.     klv_decode_ber_length(pb);

  295.     plaintext_size = get_be64(pb);

  296.     // source klv key

  297.     klv_decode_ber_length(pb);

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

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

  300.         return -1;

  301.     index = mxf_get_stream_index(s, klv);

  302.     if (index < 0)

  303.         return -1;

  304.     // source size

  305.     klv_decode_ber_length(pb);

  306.     orig_size = get_be64(pb);

  307.     if (orig_size < plaintext_size)

  308.         return -1;

  309.     // enc. code

  310.     size = klv_decode_ber_length(pb);

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

  312.         return -1;

  313.     get_buffer(pb, ivec, 16);

  314.     get_buffer(pb, tmpbuf, 16);

  315.     if (mxf->aesc)

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

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

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

  319.     size -= 32;

  320.     av_get_packet(pb, pkt, size);

  321.     size -= plaintext_size;

  322.     if (mxf->aesc)

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

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

  325.     pkt->size = orig_size;

  326.     pkt->stream_index = index;

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

  328.     return 0;

  329. }

  330. 

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

  332. {

  333.     KLVPacket klv;

  334. 

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

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

  337.             return -1;

  338. #ifdef DEBUG

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

  340. #endif

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

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

  343.             if (res < 0) {

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

  345.                 return -1;

  346.             }

  347.             return 0;

  348.         }

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

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

  351.             if (index < 0) {

  352.                 av_log(s, AV_LOG_ERROR, "error getting stream index\n");

  353.                 goto skip;

  354.             }

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

  356.                 goto skip;

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

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

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

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

  361.                     return -1;

  362.                 }

  363.             } else

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

  365.             pkt->stream_index = index;

  366.             pkt->pos = klv.offset;

  367.             return 0;

  368.         } else

  369.         skip:

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

  371.     }

  372.     return AVERROR(EIO);

  373. }

  374. 

  375. static int mxf_read_primer_pack(MXFContext *mxf)

  376. {

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

  378.     int item_num = get_be32(pb);

  379.     int item_len = get_be32(pb);

  380. 

  381.     if (item_len != 18) {

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

  383.         return -1;

  384.     }

  385.     if (item_num > UINT_MAX / item_len)

  386.         return -1;

  387.     mxf->local_tags_count = item_num;

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

  389.     if (!mxf->local_tags)

  390.         return -1;

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

  392.     return 0;

  393. }

  394. 

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

  396. {

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

  398.     if (!mxf->metadata_sets)

  399.         return -1;

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

  401.     mxf->metadata_sets_count++;

  402.     return 0;

  403. }

  404. 

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

  406. {

  407.     if (size != 16)

  408.         return -1;

  409.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  411.     return 0;

  412. }

  413. 

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

  415. {

  416.     switch (tag) {

  417.     case 0x1901:

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

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

  420.             return -1;

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

  422.         if (!mxf->packages_refs)

  423.             return -1;

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

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

  426.         break;

  427.     }

  428.     return 0;

  429. }

  430. 

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

  432. {

  433.     switch(tag) {

  434.     case 0x0202:

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

  436.         break;

  437.     case 0x1201:

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

  439.         break;

  440.     case 0x1101:

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

  442.         url_fskip(pb, 16);

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

  444.         break;

  445.     case 0x1102:

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

  447.         break;

  448.     }

  449.     return 0;

  450. }

  451. 

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

  453. {

  454.     switch(tag) {

  455.     case 0x4403:

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

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

  458.             return -1;

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

  460.         if (!package->tracks_refs)

  461.             return -1;

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

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

  464.         break;

  465.     }

  466.     return 0;

  467. }

  468. 

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

  470. {

  471.     switch(tag) {

  472.     case 0x4801:

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

  474.         break;

  475.     case 0x4804:

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

  477.         break;

  478.     case 0x4B01:

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

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

  481.         break;

  482.     case 0x4803:

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

  484.         break;

  485.     }

  486.     return 0;

  487. }

  488. 

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

  490. {

  491.     switch(tag) {

  492.     case 0x0202:

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

  494.         break;

  495.     case 0x0201:

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

  497.         break;

  498.     case 0x1001:

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

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

  501.             return -1;

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

  503.         if (!sequence->structural_components_refs)

  504.             return -1;

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

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

  507.         break;

  508.     }

  509.     return 0;

  510. }

  511. 

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

  513. {

  514.     switch(tag) {

  515.     case 0x4403:

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

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

  518.             return -1;

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

  520.         if (!package->tracks_refs)

  521.             return -1;

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

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

  524.         break;

  525.     case 0x4401:

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

  527.         url_fskip(pb, 16);

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

  529.         break;

  530.     case 0x4701:

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

  532.         break;

  533.     }

  534.     return 0;

  535. }

  536. 

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

  538. {

  539.     int code;

  540. 

  541.     do {

  542.         code = get_byte(pb);

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

  544.         switch (code) {

  545.         case 0x52: /* R */

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

  547.             break;

  548.         case 0x47: /* G */

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

  550.             break;

  551.         case 0x42: /* B */

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

  553.             break;

  554.         default:

  555.             get_byte(pb);

  556.         }

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

  558. }

  559. 

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

  561. {

  562.     switch(tag) {

  563.     case 0x3F01:

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

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

  566.             return -1;

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

  568.         if (!descriptor->sub_descriptors_refs)

  569.             return -1;

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

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

  572.         break;

  573.     case 0x3004:

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

  575.         break;

  576.     case 0x3006:

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

  578.         break;

  579.     case 0x3201: /* PictureEssenceCoding */

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

  581.         break;

  582.     case 0x3203:

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

  584.         break;

  585.     case 0x3202:

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

  587.         break;

  588.     case 0x320E:

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

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

  591.         break;

  592.     case 0x3D03:

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

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

  595.         break;

  596.     case 0x3D06: /* SoundEssenceCompression */

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

  598.         break;

  599.     case 0x3D07:

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

  601.         break;

  602.     case 0x3D01:

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

  604.         break;

  605.     case 0x3401:

  606.         mxf_read_pixel_layout(pb, descriptor);

  607.         break;

  608.     default:

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

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

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

  612.             if (!descriptor->extradata)

  613.                 return -1;

  614.             descriptor->extradata_size = size;

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

  616.         }

  617.         break;

  618.     }

  619.     return 0;

  620. }

  621. 

  622. /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */

  623. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

  624.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },

  625.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },

  626.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  627.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  628. };

  629. 

  630. static const MXFCodecUL mxf_codec_uls[] = {

  631.     /* PictureEssenceCoding */

  632.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@ML Long GoP */

  633.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* D-10 50Mbps PAL */

  634.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@HL Long GoP */

  635.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* 422P@HL I-Frame */

  636.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 }, 14,      CODEC_ID_MPEG4 }, /* XDCAM proxy_pal030926.mxf */

  637.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 }, 13,    CODEC_ID_DVVIDEO }, /* DV25 IEC PAL */

  638.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */

  639.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,   CODEC_ID_RAWVIDEO }, /* Uncompressed */

  640.     /* SoundEssenceCompression */

  641.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE }, /* Uncompressed */

  642.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE },

  643.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16BE }, /* From Omneon MXF file */

  644.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 }, 15,   CODEC_ID_PCM_ALAW }, /* XDCAM Proxy C0023S01.mxf */

  645.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 }, 15,        CODEC_ID_AC3 },

  646.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 }, 15,        CODEC_ID_MP2 }, /* MP2 or MP3 */

  647.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 }, 15,    CODEC_ID_DOLBY_E }, /* Dolby-E */

  648.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  649. };

  650. 

  651. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  652.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  653.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  654.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  655. };

  656. 

  657. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  658.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  659.     { { 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 */

  660.     { { 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 */

  661.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  662. };

  663. 

  664. /*

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

  666.  * Returns: boolean

  667.  */

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

  669. {

  670.     int i;

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

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

  673.             return 0;

  674.     }

  675.     return 1;

  676. }

  677. 

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

  679. {

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

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

  682.             break;

  683.         uls++;

  684.     }

  685.     return uls;

  686. }

  687. 

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

  689. {

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

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

  692.             break;

  693.         uls++;

  694.     }

  695.     return uls->type;

  696. }

  697. 

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

  699. {

  700.     int i;

  701. 

  702.     if (!strong_ref)

  703.         return NULL;

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

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

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

  707.             return mxf->metadata_sets[i];

  708.         }

  709.     }

  710.     return NULL;

  711. }

  712. 

  713. static int mxf_parse_structural_metadata(MXFContext *mxf)

  714. {

  715.     MXFPackage *material_package = NULL;

  716.     MXFPackage *temp_package = NULL;

  717.     int i, j, k;

  718. 

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

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

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

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

  723.         if (material_package) break;

  724.     }

  725.     if (!material_package) {

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

  727.         return -1;

  728.     }

  729. 

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

  731.         MXFPackage *source_package = NULL;

  732.         MXFTrack *material_track = NULL;

  733.         MXFTrack *source_track = NULL;

  734.         MXFTrack *temp_track = NULL;

  735.         MXFDescriptor *descriptor = NULL;

  736.         MXFStructuralComponent *component = NULL;

  737.         UID *essence_container_ul = NULL;

  738.         const MXFCodecUL *codec_ul = NULL;

  739.         const MXFCodecUL *container_ul = NULL;

  740.         AVStream *st;

  741. 

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

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

  744.             continue;

  745.         }

  746. 

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

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

  749.             return -1;

  750.         }

  751. 

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

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

  754.             /* TODO: handle timecode component */

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

  756.             if (!component)

  757.                 continue;

  758. 

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

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

  761.                 if (!temp_package)

  762.                     continue;

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

  764.                     source_package = temp_package;

  765.                     break;

  766.                 }

  767.             }

  768.             if (!source_package) {

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

  770.                 break;

  771.             }

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

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

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

  775.                     return -1;

  776.                 }

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

  778.                     source_track = temp_track;

  779.                     break;

  780.                 }

  781.             }

  782.             if (!source_track) {

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

  784.                 break;

  785.             }

  786.         }

  787.         if (!source_track)

  788.             continue;

  789. 

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

  791.         if (!st) {

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

  793.             return -1;

  794.         }

  795.         st->priv_data = source_track;

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

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

  798.             st->duration = AV_NOPTS_VALUE;

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

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

  801. 

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

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

  804.             return -1;

  805.         }

  806. 

  807. #ifdef DEBUG

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

  809. #endif

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

  811. 

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

  813.         if (source_package->descriptor) {

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

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

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

  817. 

  818.                     if (!sub_descriptor) {

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

  820.                         continue;

  821.                     }

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

  823.                         descriptor = sub_descriptor;

  824.                         break;

  825.                     }

  826.                 }

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

  828.                 descriptor = source_package->descriptor;

  829.         }

  830.         if (!descriptor) {

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

  832.             continue;

  833.         }

  834. #ifdef DEBUG

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

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

  837. #endif

  838.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  847.                     break;

  848.                 }

  849.             }

  850.         }

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

  852.         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);

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

  854.         if (descriptor->extradata) {

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

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

  857.         }

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

  859.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

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

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

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

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

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

  865.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  867.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

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

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

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

  871.             st->codec->bits_per_sample = descriptor->bits_per_sample;

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

  873.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  885.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  886.             }

  887.         }

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

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

  890.             st->need_parsing = AVSTREAM_PARSE_FULL;

  891.         }

  892.     }

  893.     return 0;

  894. }

  895. 

  896. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  897.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  898.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  899.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  900.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  901.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  902.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  903.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  904.     { { 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 */

  905.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  906.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  907.     { { 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 */

  908.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  909.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  910.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  911.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  912.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  913.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  914. };

  915. 

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

  917. {

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

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

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

  921. 

  922.     if (!ctx)

  923.         return -1;

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

  925.         int tag = get_be16(pb);

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

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

  928.         UID uid = {0};

  929. 

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

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

  932.             continue;

  933.         }

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

  935.             int i;

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

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

  938.                 if (local_tag == tag) {

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

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

  941. #ifdef DEBUG

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

  943. #endif

  944.                 }

  945.             }

  946.         }

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

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

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

  950.             return -1;

  951. 

  952.         url_fseek(pb, next, SEEK_SET);

  953.     }

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

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

  956. }

  957. 

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

  959. {

  960.     MXFContext *mxf = s->priv_data;

  961.     KLVPacket klv;

  962. 

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

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

  965.         return -1;

  966.     }

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

  968.     mxf->fc = s;

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

  970.         const MXFMetadataReadTableEntry *metadata;

  971. 

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

  973.             return -1;

  974. #ifdef DEBUG

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

  976. #endif

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

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

  979.             /* FIXME avoid seek */

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

  981.             break;

  982.         }

  983. 

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

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

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

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

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

  989.                     return -1;

  990.                 }

  991.                 break;

  992.             }

  993.         }

  994.         if (!metadata->read)

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

  996.     }

  997.     return mxf_parse_structural_metadata(mxf);

  998. }

  999. 

  1000. static int mxf_read_close(AVFormatContext *s)

  1001. {

  1002.     MXFContext *mxf = s->priv_data;

  1003.     int i;

  1004. 

  1005.     av_freep(&mxf->packages_refs);

  1006.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1007.         switch (mxf->metadata_sets[i]->type) {

  1008.         case MultipleDescriptor:

  1009.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1010.             break;

  1011.         case Sequence:

  1012.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1013.             break;

  1014.         case SourcePackage:

  1015.         case MaterialPackage:

  1016.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1017.             break;

  1018.         default:

  1019.             break;

  1020.         }

  1021.         av_freep(&mxf->metadata_sets[i]);

  1022.     }

  1023.     av_freep(&mxf->metadata_sets);

  1024.     av_freep(&mxf->aesc);

  1025.     av_freep(&mxf->local_tags);

  1026.     return 0;

  1027. }

  1028. 

  1029. static int mxf_probe(AVProbeData *p) {

  1030.     uint8_t *bufp = p->buf;

  1031.     uint8_t *end = p->buf + p->buf_size;

  1032. 

  1033.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1034.         return 0;

  1035. 

  1036.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1037.     end -= sizeof(mxf_header_partition_pack_key);

  1038.     for (; bufp < end; bufp++) {

  1039.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1040.             return AVPROBE_SCORE_MAX;

  1041.     }

  1042.     return 0;

  1043. }

  1044. 

  1045. /* rudimentary byte seek */

  1046. /* XXX: use MXF Index */

  1047. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1048. {

  1049.     AVStream *st = s->streams[stream_index];

  1050.     int64_t seconds;

  1051. 

  1052.     if (!s->bit_rate)

  1053.         return -1;

  1054.     if (sample_time < 0)

  1055.         sample_time = 0;

  1056.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1057.     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1058.     av_update_cur_dts(s, st, sample_time);

  1059.     return 0;

  1060. }

  1061. 

  1062. AVInputFormat mxf_demuxer = {

  1063.     "mxf",

  1064.     "MXF format",

  1065.     sizeof(MXFContext),

  1066.     mxf_probe,

  1067.     mxf_read_header,

  1068.     mxf_read_packet,

  1069.     mxf_read_close,

  1070.     mxf_read_seek,

  1071. };