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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. 

  51. typedef uint8_t UID[16];

  52. 

  53. enum MXFMetadataSetType {

  54.     AnyType,

  55.     MaterialPackage,

  56.     SourcePackage,

  57.     SourceClip,

  58.     TimecodeComponent,

  59.     Sequence,

  60.     MultipleDescriptor,

  61.     Descriptor,

  62.     Track,

  63.     CryptoContext,

  64. };

  65. 

  66. typedef struct {

  67.     UID uid;

  68.     enum MXFMetadataSetType type;

  69.     UID context_uid;

  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. } MXFContext;

  143. 

  144. typedef struct {

  145.     UID key;

  146.     offset_t offset;

  147.     uint64_t length;

  148. } KLVPacket;

  149. 

  150. enum MXFWrappingScheme {

  151.     Frame,

  152.     Clip,

  153. };

  154. 

  155. typedef struct {

  156.     UID uid;

  157.     enum CodecID id;

  158.     enum MXFWrappingScheme wrapping;

  159. } MXFCodecUL;

  160. 

  161. typedef struct {

  162.     UID uid;

  163.     enum CodecType type;

  164. } MXFDataDefinitionUL;

  165. 

  166. typedef struct {

  167.     const UID key;

  168.     int (*read)();

  169.     int ctx_size;

  170.     enum MXFMetadataSetType type;

  171. } MXFMetadataReadTableEntry;

  172. 

  173. /* partial keys to match */

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

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

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

  177. /* complete keys to match */

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

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

  180. 

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

  182. 

  183. #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, \

  184.                              (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])

  185. 

  186. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  187. {

  188.     uint64_t size = get_byte(pb);

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

  190.         int bytes_num = size & 0x7f;

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

  192.         if (bytes_num > 8)

  193.             return -1;

  194.         size = 0;

  195.         while (bytes_num--)

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

  197.     }

  198.     return size;

  199. }

  200. 

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

  202. {

  203.     int i, b;

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

  205.         b = get_byte(pb);

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

  207.             i = 0;

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

  209.             i = -1;

  210.     }

  211.     return i == size;

  212. }

  213. 

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

  215. {

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

  217.         return -1;

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

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

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

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

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

  223. }

  224. 

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

  226. {

  227.     int i;

  228. 

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

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

  231.         /* SMPTE 379M 7.3 */

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

  233.             return i;

  234.     }

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

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

  237. }

  238. 

  239. /* XXX: use AVBitStreamFilter */

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

  241. {

  242.     uint8_t buffer[61444];

  243.     uint8_t *buf_ptr, *end_ptr, *data_ptr;

  244. 

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

  246.         return -1;

  247.     get_buffer(pb, buffer, length);

  248.     av_new_packet(pkt, length);

  249.     data_ptr = pkt->data;

  250.     end_ptr = buffer + length;

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

  252.     for (; buf_ptr < end_ptr; buf_ptr += 4) {

  253.         if (st->codec->bits_per_sample == 24) {

  254.             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);

  255.             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);

  256.             data_ptr[2] = (buf_ptr[0] >> 4) | ((buf_ptr[1] & 0x0f) << 4);

  257.             data_ptr += 3;

  258.         } else {

  259.             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);

  260.             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);

  261.             data_ptr += 2;

  262.         }

  263.     }

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

  265.     return 0;

  266. }

  267. 

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

  269. {

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

  271.     MXFContext *mxf = s->priv_data;

  272.     ByteIOContext *pb = &s->pb;

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

  274.     uint64_t size;

  275.     uint64_t orig_size;

  276.     uint64_t plaintext_size;

  277.     uint8_t ivec[16];

  278.     uint8_t tmpbuf[16];

  279.     int index;

  280. 

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

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

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

  284.     }

  285.     // crypto context

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

  287.     // plaintext offset

  288.     klv_decode_ber_length(pb);

  289.     plaintext_size = get_be64(pb);

  290.     // source klv key

  291.     klv_decode_ber_length(pb);

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

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

  294.         return -1;

  295.     index = mxf_get_stream_index(s, klv);

  296.     if (index < 0)

  297.         return -1;

  298.     // source size

  299.     klv_decode_ber_length(pb);

  300.     orig_size = get_be64(pb);

  301.     if (orig_size < plaintext_size)

  302.         return -1;

  303.     // enc. code

  304.     size = klv_decode_ber_length(pb);

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

  306.         return -1;

  307.     get_buffer(pb, ivec, 16);

  308.     get_buffer(pb, tmpbuf, 16);

  309.     if (mxf->aesc)

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

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

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

  313.     size -= 32;

  314.     av_get_packet(pb, pkt, size);

  315.     size -= plaintext_size;

  316.     if (mxf->aesc)

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

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

  319.     pkt->size = orig_size;

  320.     pkt->stream_index = index;

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

  322.     return 0;

  323. }

  324. 

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

  326. {

  327.     KLVPacket klv;

  328. 

  329.     while (!url_feof(&s->pb)) {

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

  331.             return -1;

  332. #ifdef DEBUG

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

  334. #endif

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

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

  337.             if (res < 0) {

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

  339.                 return -1;

  340.             }

  341.             return 0;

  342.         }

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

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

  345.             if (index < 0) {

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

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

  348.                 return -1;

  349.             }

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

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

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

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

  354.                     return -1;

  355.                 }

  356.             } else

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

  358.             pkt->stream_index = index;

  359.             pkt->pos = klv.offset;

  360.             return 0;

  361.         } else

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

  363.     }

  364.     return AVERROR(EIO);

  365. }

  366. 

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

  368. {

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

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

  371.     mxf->metadata_sets_count++;

  372.     return 0;

  373. }

  374. 

  375. static int mxf_read_metadata_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag)

  376. {

  377.     switch(tag) {

  378.     case 0xFFFE:

  379.         get_buffer(pb, cryptocontext->context_uid, 16);

  380.         break;

  381.     case 0xFFFD:

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

  383.         break;

  384.     }

  385.     return 0;

  386. }

  387. 

  388. static int mxf_read_metadata_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)

  389. {

  390.     switch (tag) {

  391.     case 0x1901:

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

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

  394.             return -1;

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

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

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

  398.         break;

  399.     }

  400.     return 0;

  401. }

  402. 

  403. static int mxf_read_metadata_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)

  404. {

  405.     switch(tag) {

  406.     case 0x0202:

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

  408.         break;

  409.     case 0x1201:

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

  411.         break;

  412.     case 0x1101:

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

  414.         url_fskip(pb, 16);

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

  416.         break;

  417.     case 0x1102:

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

  419.         break;

  420.     }

  421.     return 0;

  422. }

  423. 

  424. static int mxf_read_metadata_material_package(MXFPackage *package, ByteIOContext *pb, int tag)

  425. {

  426.     switch(tag) {

  427.     case 0x4403:

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

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

  430.             return -1;

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

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

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

  434.         break;

  435.     }

  436.     return 0;

  437. }

  438. 

  439. static int mxf_read_metadata_track(MXFTrack *track, ByteIOContext *pb, int tag)

  440. {

  441.     switch(tag) {

  442.     case 0x4801:

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

  444.         break;

  445.     case 0x4804:

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

  447.         break;

  448.     case 0x4B01:

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

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

  451.         break;

  452.     case 0x4803:

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

  454.         break;

  455.     }

  456.     return 0;

  457. }

  458. 

  459. static int mxf_read_metadata_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)

  460. {

  461.     switch(tag) {

  462.     case 0x0202:

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

  464.         break;

  465.     case 0x0201:

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

  467.         break;

  468.     case 0x1001:

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

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

  471.             return -1;

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

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

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

  475.         break;

  476.     }

  477.     return 0;

  478. }

  479. 

  480. static int mxf_read_metadata_source_package(MXFPackage *package, ByteIOContext *pb, int tag)

  481. {

  482.     switch(tag) {

  483.     case 0x4403:

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

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

  486.             return -1;

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

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

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

  490.         break;

  491.     case 0x4401:

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

  493.         url_fskip(pb, 16);

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

  495.         break;

  496.     case 0x4701:

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

  498.         break;

  499.     }

  500.     return 0;

  501. }

  502. 

  503. static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)

  504. {

  505.     int code;

  506. 

  507.     do {

  508.         code = get_byte(pb);

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

  510.         switch (code) {

  511.         case 0x52: /* R */

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

  513.             break;

  514.         case 0x47: /* G */

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

  516.             break;

  517.         case 0x42: /* B */

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

  519.             break;

  520.         default:

  521.             get_byte(pb);

  522.         }

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

  524. }

  525. 

  526. static int mxf_read_metadata_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size)

  527. {

  528.     switch(tag) {

  529.     case 0x3F01:

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

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

  532.             return -1;

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

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

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

  536.         break;

  537.     case 0x3004:

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

  539.         break;

  540.     case 0x3006:

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

  542.         break;

  543.     case 0x3201: /* PictureEssenceCoding */

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

  545.         break;

  546.     case 0x3203:

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

  548.         break;

  549.     case 0x3202:

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

  551.         break;

  552.     case 0x320E:

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

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

  555.         break;

  556.     case 0x3D03:

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

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

  559.         break;

  560.     case 0x3D06: /* SoundEssenceCompression */

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

  562.         break;

  563.     case 0x3D07:

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

  565.         break;

  566.     case 0x3D01:

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

  568.         break;

  569.     case 0x3401:

  570.         mxf_read_metadata_pixel_layout(pb, descriptor);

  571.         break;

  572.     case 0x8201: /* Private tag used by SONY C0023S01.mxf */

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

  574.         descriptor->extradata_size = size;

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

  576.         break;

  577.     }

  578.     return 0;

  579. }

  580. 

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

  582. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

  583.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },

  584.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },

  585.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  586.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  587. };

  588. 

  589. static const MXFCodecUL mxf_codec_uls[] = {

  590.     /* PictureEssenceCoding */

  591.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  592. 

  593.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  594.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x03 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 40Mbps PAL */

  595.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  596. 

  597.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  598.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  599. 

  600.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  601. 

  602.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */

  603.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  604. 

  605.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  606.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  607. 

  608.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  609.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  610.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  611. 

  612.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  613. 

  614.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  615.     /* SoundEssenceCompression */

  616.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  617.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  618.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 },  CODEC_ID_PCM_S16BE, Frame }, /* From Omneon MXF file */

  619.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame }, /* XDCAM Proxy C0023S01.mxf */

  620.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  621.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  622.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  623.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  624. };

  625. 

  626. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  627.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  628.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xe0,0x02 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Clip wrapped, 0xe0 MPV stream id */

  629.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x04,0x61,0x07 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Custom wrapped, 0x61 ??? stream id */

  630.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  631. };

  632. 

  633. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  634.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  635.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  636.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  637.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0xc0 MPA stream id */

  638.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x02 },        CODEC_ID_MP2,  Clip }, /* MPEG-ES Clip wrapped, 0xc0 MPA stream id */

  639.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */

  640.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x03,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 40Mbps PAL Extended Template */

  641.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 50Mbps PAL Extended Template */

  642.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  643. };

  644. 

  645. /*

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

  647.  * Returns: boolean

  648.  */

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

  650. {

  651.     int i;

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

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

  654.             return 0;

  655.     }

  656.     return 1;

  657. }

  658. 

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

  660. {

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

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

  663.             break;

  664.         uls++;

  665.     }

  666.     return uls;

  667. }

  668. 

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

  670. {

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

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

  673.             break;

  674.         uls++;

  675.     }

  676.     return uls->type;

  677. }

  678. 

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

  680. {

  681.     int i;

  682. 

  683.     if (!strong_ref)

  684.         return NULL;

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

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

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

  688.             return mxf->metadata_sets[i];

  689.         }

  690.     }

  691.     return NULL;

  692. }

  693. 

  694. static int mxf_parse_structural_metadata(MXFContext *mxf)

  695. {

  696.     MXFPackage *material_package = NULL;

  697.     MXFPackage *temp_package = NULL;

  698.     int i, j, k;

  699. 

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

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

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

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

  704.         if (material_package) break;

  705.     }

  706.     if (!material_package) {

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

  708.         return -1;

  709.     }

  710. 

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

  712.         MXFPackage *source_package = NULL;

  713.         MXFTrack *material_track = NULL;

  714.         MXFTrack *source_track = NULL;

  715.         MXFTrack *temp_track = NULL;

  716.         MXFDescriptor *descriptor = NULL;

  717.         MXFStructuralComponent *component = NULL;

  718.         UID *essence_container_ul = NULL;

  719.         const MXFCodecUL *codec_ul = NULL;

  720.         const MXFCodecUL *container_ul = NULL;

  721.         AVStream *st;

  722. 

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

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

  725.             continue;

  726.         }

  727. 

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

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

  730.             return -1;

  731.         }

  732. 

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

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

  735.             /* TODO: handle timecode component */

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

  737.             if (!component)

  738.                 continue;

  739. 

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

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

  742.                 if (!temp_package)

  743.                     continue;

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

  745.                     source_package = temp_package;

  746.                     break;

  747.                 }

  748.             }

  749.             if (!source_package) {

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

  751.                 break;

  752.             }

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

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

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

  756.                     return -1;

  757.                 }

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

  759.                     source_track = temp_track;

  760.                     break;

  761.                 }

  762.             }

  763.             if (!source_track) {

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

  765.                 break;

  766.             }

  767.         }

  768.         if (!source_track)

  769.             continue;

  770. 

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

  772.         st->priv_data = source_track;

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

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

  775.             st->duration = AV_NOPTS_VALUE;

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

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

  778. 

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

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

  781.             return -1;

  782.         }

  783. 

  784. #ifdef DEBUG

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

  786. #endif

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

  788. 

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

  790.         if (source_package->descriptor) {

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

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

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

  794. 

  795.                     if (!sub_descriptor) {

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

  797.                         continue;

  798.                     }

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

  800.                         descriptor = sub_descriptor;

  801.                         break;

  802.                     }

  803.                 }

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

  805.                 descriptor = source_package->descriptor;

  806.         }

  807.         if (!descriptor) {

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

  809.             continue;

  810.         }

  811. #ifdef DEBUG

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

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

  814. #endif

  815.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  824.                     break;

  825.                 }

  826.             }

  827.         }

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

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

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

  831.         if (descriptor->extradata) {

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

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

  834.         }

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

  836.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

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

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

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

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

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

  842.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  844.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

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

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

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

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

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

  850.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

  861.                 if (descriptor->essence_container_ul[13] == 0x01) /* D-10 Mapping */

  862.                     st->codec->channels = 8; /* force channels to 8 */

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

  864.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  865.             }

  866.         }

  867.         if (container_ul && container_ul->wrapping == Clip) {

  868.             dprintf(mxf->fc, "stream %d: clip wrapped essence\n", st->index);

  869.             st->need_parsing = AVSTREAM_PARSE_FULL;

  870.         }

  871.     }

  872.     return 0;

  873. }

  874. 

  875. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  876.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage, 0, AnyType },

  877.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package, sizeof(MXFPackage), SourcePackage },

  878.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package, sizeof(MXFPackage), MaterialPackage },

  879.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence, sizeof(MXFSequence), Sequence },

  880.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  881.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  882.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */

  883.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  884.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  885.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */

  886.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  887.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  888.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Static Track */

  889.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Generic Track */

  890.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_metadata_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  891.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  892. };

  893. 

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

  895. {

  896.     ByteIOContext *pb = &mxf->fc->pb;

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

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

  899. 

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

  901.         int tag = get_be16(pb);

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

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

  904. 

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

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

  907.             continue;

  908.         }

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

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

  911.         else

  912.             read_child(ctx, pb, tag, size);

  913. 

  914.         url_fseek(pb, next, SEEK_SET);

  915.     }

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

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

  918. }

  919. 

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

  921. {

  922.     MXFContext *mxf = s->priv_data;

  923.     KLVPacket klv;

  924. 

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

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

  927.         return -1;

  928.     }

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

  930.     mxf->fc = s;

  931.     while (!url_feof(&s->pb)) {

  932.         const MXFMetadataReadTableEntry *metadata;

  933. 

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

  935.             return -1;

  936. #ifdef DEBUG

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

  938. #endif

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

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

  941.             /* FIXME avoid seek */

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

  943.             break;

  944.         }

  945. 

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

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

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

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

  950.                     return -1;

  951.                 }

  952.                 break;

  953.             }

  954.         }

  955.         if (!metadata->read)

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

  957.     }

  958.     return mxf_parse_structural_metadata(mxf);

  959. }

  960. 

  961. static int mxf_read_close(AVFormatContext *s)

  962. {

  963.     MXFContext *mxf = s->priv_data;

  964.     int i;

  965. 

  966.     av_freep(&mxf->packages_refs);

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

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

  969.         case MultipleDescriptor:

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

  971.             break;

  972.         case Sequence:

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

  974.             break;

  975.         case SourcePackage:

  976.         case MaterialPackage:

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

  978.             break;

  979.         default:

  980.             break;

  981.         }

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

  983.     }

  984.     av_freep(&mxf->metadata_sets);

  985.     av_freep(&mxf->aesc);

  986.     return 0;

  987. }

  988. 

  989. static int mxf_probe(AVProbeData *p) {

  990.     uint8_t *bufp = p->buf;

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

  992. 

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

  994.         return 0;

  995. 

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

  997.     end -= sizeof(mxf_header_partition_pack_key);

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

  999.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1000.             return AVPROBE_SCORE_MAX;

  1001.     }

  1002.     return 0;

  1003. }

  1004. 

  1005. /* rudimentary byte seek */

  1006. /* XXX: use MXF Index */

  1007. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1008. {

  1009.     AVStream *st = s->streams[stream_index];

  1010.     int64_t seconds;

  1011. 

  1012.     if (!s->bit_rate)

  1013.         return -1;

  1014.     if (sample_time < 0)

  1015.         sample_time = 0;

  1016.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1017.     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1018.     av_update_cur_dts(s, st, sample_time);

  1019.     return 0;

  1020. }

  1021. 

  1022. AVInputFormat mxf_demuxer = {

  1023.     "mxf",

  1024.     "MXF format",

  1025.     sizeof(MXFContext),

  1026.     mxf_probe,

  1027.     mxf_read_header,

  1028.     mxf_read_packet,

  1029.     mxf_read_close,

  1030.     mxf_read_seek,

  1031. };