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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. 

  50. typedef uint8_t UID[16];

  51. 

  52. enum MXFMetadataSetType {

  53.     MaterialPackage,

  54.     SourcePackage,

  55.     SourceClip,

  56.     TimecodeComponent,

  57.     Sequence,

  58.     MultipleDescriptor,

  59.     Descriptor,

  60.     Track,

  61.     EssenceContainerData,

  62. };

  63. 

  64. typedef struct MXFStructuralComponent {

  65.     UID uid;

  66.     enum MXFMetadataSetType type;

  67.     UID source_package_uid;

  68.     UID data_definition_ul;

  69.     int64_t duration;

  70.     int64_t start_position;

  71.     int source_track_id;

  72. } MXFStructuralComponent;

  73. 

  74. typedef struct MXFSequence {

  75.     UID uid;

  76.     enum MXFMetadataSetType type;

  77.     UID data_definition_ul;

  78.     UID *structural_components_refs;

  79.     int structural_components_count;

  80.     int64_t duration;

  81. } MXFSequence;

  82. 

  83. typedef struct MXFTrack {

  84.     UID uid;

  85.     enum MXFMetadataSetType type;

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

  87.     UID sequence_ref;

  88.     int track_id;

  89.     uint8_t track_number[4];

  90.     AVRational edit_rate;

  91. } MXFTrack;

  92. 

  93. typedef struct MXFDescriptor {

  94.     UID uid;

  95.     enum MXFMetadataSetType type;

  96.     UID essence_container_ul;

  97.     UID essence_codec_ul;

  98.     AVRational sample_rate;

  99.     AVRational aspect_ratio;

  100.     int width;

  101.     int height;

  102.     int channels;

  103.     int bits_per_sample;

  104.     UID *sub_descriptors_refs;

  105.     int sub_descriptors_count;

  106.     int linked_track_id;

  107.     uint8_t *extradata;

  108.     int extradata_size;

  109. } MXFDescriptor;

  110. 

  111. typedef struct MXFPackage {

  112.     UID uid;

  113.     enum MXFMetadataSetType type;

  114.     UID package_uid;

  115.     UID *tracks_refs;

  116.     int tracks_count;

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

  118.     UID descriptor_ref;

  119. } MXFPackage;

  120. 

  121. typedef struct MXFEssenceContainerData {

  122.     UID uid;

  123.     enum MXFMetadataSetType type;

  124.     UID linked_package_uid;

  125. } MXFEssenceContainerData;

  126. 

  127. typedef struct {

  128.     UID uid;

  129.     enum MXFMetadataSetType type;

  130. } MXFMetadataSet;

  131. 

  132. typedef struct MXFContext {

  133.     UID *packages_refs;

  134.     int packages_count;

  135.     UID *essence_container_data_sets_refs;

  136.     int essence_container_data_sets_count;

  137.     UID *essence_containers_uls; /* Universal Labels SMPTE RP224 */

  138.     int essence_containers_uls_count;

  139.     UID operational_pattern_ul;

  140.     UID content_storage_uid;

  141.     MXFMetadataSet **metadata_sets;

  142.     int metadata_sets_count;

  143.     AVFormatContext *fc;

  144. } MXFContext;

  145. 

  146. typedef struct KLVPacket {

  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 MXFCodecUL {

  158.     UID uid;

  159.     enum CodecID id;

  160.     enum MXFWrappingScheme wrapping;

  161. } MXFCodecUL;

  162. 

  163. typedef struct MXFDataDefinitionUL {

  164.     UID uid;

  165.     enum CodecType type;

  166. } MXFDataDefinitionUL;

  167. 

  168. typedef struct MXFMetadataReadTableEntry {

  169.     const UID key;

  170.     int (*read)(MXFContext *mxf, KLVPacket *klv);

  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. 

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

  178. 

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

  180.                              (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])

  181. 

  182. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  183. {

  184.     int64_t size = 0;

  185.     uint8_t length = get_byte(pb);

  186.     int type = length >> 7;

  187. 

  188.     if (type) { /* long form */

  189.         int bytes_num = length & 0x7f;

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

  191.         if (bytes_num > 8)

  192.             return -1;

  193.         while (bytes_num--)

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

  195.     } else {

  196.         size = length & 0x7f;

  197.     }

  198.     return size;

  199. }

  200. 

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

  202. {

  203.     klv->offset = url_ftell(pb);

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

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

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

  207. }

  208. 

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

  210. {

  211.     int i;

  212. 

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

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

  215.          /* SMPTE 379M 7.3 */

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

  217.             return i;

  218.     }

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

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

  221. }

  222. 

  223. /* XXX: use AVBitStreamFilter */

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

  225. {

  226.     uint8_t buffer[61444];

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

  228. 

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

  230.         return -1;

  231.     get_buffer(pb, buffer, length);

  232.     av_new_packet(pkt, length);

  233.     data_ptr = pkt->data;

  234.     end_ptr = buffer + length;

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

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

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

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

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

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

  241.             data_ptr += 3;

  242.         } else {

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

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

  245.             data_ptr += 2;

  246.         }

  247.     }

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

  249.     return 0;

  250. }

  251. 

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

  253. {

  254.     KLVPacket klv;

  255. 

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

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

  258.             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");

  259.             return -1;

  260.         }

  261. #ifdef DEBUG

  262.         PRINT_KEY("read packet", klv.key);

  263. #endif

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

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

  266.             if (index < 0) {

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

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

  269.                 return -1;

  270.             }

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

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

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

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

  275.                     return -1;

  276.                 }

  277.             } else

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

  279.             pkt->stream_index = index;

  280.             return 0;

  281.         } else

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

  283.     }

  284.     return AVERROR_IO;

  285. }

  286. 

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

  288. {

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

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

  291.     mxf->metadata_sets_count++;

  292.     return 0;

  293. }

  294. 

  295. static int mxf_read_metadata_preface(MXFContext *mxf, KLVPacket *klv)

  296. {

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

  298.     int bytes_read = 0;

  299. 

  300.     while (bytes_read < klv->length) {

  301.         int tag = get_be16(pb);

  302.         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */

  303. 

  304.         switch (tag) {

  305.         case 0x3B03:

  306.             get_buffer(pb, mxf->content_storage_uid, 16);

  307.             break;

  308.         case 0x3B09:

  309.             get_buffer(pb, mxf->operational_pattern_ul, 16);

  310.             break;

  311.         case 0x3B0A:

  312.             mxf->essence_containers_uls_count = get_be32(pb);

  313.             if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))

  314.                 return -1;

  315.             mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));

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

  317.             get_buffer(pb, (uint8_t *)mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));

  318.             break;

  319.         default:

  320.             url_fskip(pb, size);

  321.         }

  322.         bytes_read += size + 4;

  323.     }

  324.     return 0;

  325. }

  326. 

  327. static int mxf_read_metadata_content_storage(MXFContext *mxf, KLVPacket *klv)

  328. {

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

  330.     int bytes_read = 0;

  331. 

  332.     while (bytes_read < klv->length) {

  333.         int tag = get_be16(pb);

  334.         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */

  335. 

  336.         dprintf("tag 0x%04X, size %d\n", tag, size);

  337.         switch (tag) {

  338.         case 0x1901:

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

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

  341.                 return -1;

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

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

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

  345.             break;

  346.         case 0x1902:

  347.             mxf->essence_container_data_sets_count = get_be32(pb);

  348.             if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))

  349.                 return -1;

  350.             mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));

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

  352.             get_buffer(pb, (uint8_t *)mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));

  353.             break;

  354.         default:

  355.             url_fskip(pb, size);

  356.         }

  357.         bytes_read += size + 4;

  358.     }

  359.     return 0;

  360. }

  361. 

  362. static int mxf_read_metadata_source_clip(MXFContext *mxf, KLVPacket *klv)

  363. {

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

  365.     MXFStructuralComponent *source_clip = av_mallocz(sizeof(*source_clip));

  366.     int bytes_read = 0;

  367. 

  368.     while (bytes_read < klv->length) {

  369.         int tag = get_be16(pb);

  370.         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */

  371. 

  372.         bytes_read += size + 4;

  373.         dprintf("tag 0x%04X, size %d\n", tag, size);

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

  375.             continue;

  376.         switch (tag) {

  377.         case 0x3C0A:

  378.             get_buffer(pb, source_clip->uid, 16);

  379.             break;

  380.         case 0x0202:

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

  382.             break;

  383.         case 0x1201:

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

  385.             break;

  386.         case 0x1101:

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

  388.             url_fskip(pb, 16);

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

  390.             break;

  391.         case 0x1102:

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

  393.             break;

  394.         default:

  395.             url_fskip(pb, size);

  396.         }

  397.     }

  398.     source_clip->type = SourceClip;

  399.     return mxf_add_metadata_set(mxf, source_clip);

  400. }

  401. 

  402. static int mxf_read_metadata_material_package(MXFContext *mxf, KLVPacket *klv)

  403. {

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

  405.     MXFPackage *package = av_mallocz(sizeof(*package));

  406.     int bytes_read = 0;

  407. 

  408.     while (bytes_read < klv->length) {

  409.         int tag = get_be16(pb);

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

  411. 

  412.         switch (tag) {

  413.         case 0x3C0A:

  414.             get_buffer(pb, package->uid, 16);

  415.             break;

  416.         case 0x4403:

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

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

  419.                 return -1;

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

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

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

  423.             break;

  424.         default:

  425.             url_fskip(pb, size);

  426.         }

  427.         bytes_read += size + 4;

  428.     }

  429.     package->type = MaterialPackage;

  430.     return mxf_add_metadata_set(mxf, package);

  431. }

  432. 

  433. static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)

  434. {

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

  436.     MXFTrack *track = av_mallocz(sizeof(*track));

  437.     int bytes_read = 0;

  438. 

  439.     while (bytes_read < klv->length) {

  440.         int tag = get_be16(pb);

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

  442. 

  443.         dprintf("tag 0x%04X, size %d\n", tag, size);

  444.         switch (tag) {

  445.         case 0x3C0A:

  446.             get_buffer(pb, track->uid, 16);

  447.             break;

  448.         case 0x4801:

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

  450.             break;

  451.         case 0x4804:

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

  453.             break;

  454.         case 0x4B01:

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

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

  457.             break;

  458.         case 0x4803:

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

  460.             break;

  461.         default:

  462.             url_fskip(pb, size);

  463.         }

  464.         bytes_read += size + 4;

  465.     }

  466.     track->type = Track;

  467.     return mxf_add_metadata_set(mxf, track);

  468. }

  469. 

  470. static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)

  471. {

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

  473.     MXFSequence *sequence = av_mallocz(sizeof(*sequence));

  474.     int bytes_read = 0;

  475. 

  476.     while (bytes_read < klv->length) {

  477.         int tag = get_be16(pb);

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

  479. 

  480.         dprintf("tag 0x%04X, size %d\n", tag, size);

  481.         switch (tag) {

  482.         case 0x3C0A:

  483.             get_buffer(pb, sequence->uid, 16);

  484.             break;

  485.         case 0x0202:

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

  487.             break;

  488.         case 0x0201:

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

  490.             break;

  491.         case 0x1001:

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

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

  494.                 return -1;

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

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

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

  498.             break;

  499.         default:

  500.             url_fskip(pb, size);

  501.         }

  502.         bytes_read += size + 4;

  503.     }

  504.     sequence->type = Sequence;

  505.     return mxf_add_metadata_set(mxf, sequence);

  506. }

  507. 

  508. static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)

  509. {

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

  511.     MXFPackage *package = av_mallocz(sizeof(*package));

  512.     int bytes_read = 0;

  513. 

  514.     while (bytes_read < klv->length) {

  515.         int tag = get_be16(pb);

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

  517. 

  518.         dprintf("tag 0x%04X, size %d\n", tag, size);

  519.         switch (tag) {

  520.         case 0x3C0A:

  521.             get_buffer(pb, package->uid, 16);

  522.             break;

  523.         case 0x4403:

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

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

  526.                 return -1;

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

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

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

  530.             break;

  531.         case 0x4401:

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

  533.             url_fskip(pb, 16);

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

  535.             break;

  536.         case 0x4701:

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

  538.             break;

  539.         default:

  540.             url_fskip(pb, size);

  541.         }

  542.         bytes_read += size + 4;

  543.     }

  544.     package->type = SourcePackage;

  545.     return mxf_add_metadata_set(mxf, package);

  546. }

  547. 

  548. static int mxf_read_metadata_multiple_descriptor(MXFContext *mxf, KLVPacket *klv)

  549. {

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

  551.     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));

  552.     int bytes_read = 0;

  553. 

  554.     while (bytes_read < klv->length) {

  555.         int tag = get_be16(pb);

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

  557. 

  558.         dprintf("tag 0x%04X, size %d\n", tag, size);

  559.         switch (tag) {

  560.         case 0x3C0A:

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

  562.             break;

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

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

  570.             break;

  571.         default:

  572.             url_fskip(pb, size);

  573.         }

  574.         bytes_read += size + 4;

  575.     }

  576.     descriptor->type = MultipleDescriptor;

  577.     return mxf_add_metadata_set(mxf, descriptor);

  578. }

  579. 

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

  581. {

  582.     int code;

  583. 

  584.     do {

  585.         code = get_byte(pb);

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

  587.         switch (code) {

  588.         case 0x52: /* R */

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

  590.             break;

  591.         case 0x47: /* G */

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

  593.             break;

  594.         case 0x42: /* B */

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

  596.             break;

  597.         default:

  598.             get_byte(pb);

  599.         }

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

  601. }

  602. 

  603. static int mxf_read_metadata_generic_descriptor(MXFContext *mxf, KLVPacket *klv)

  604. {

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

  606.     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));

  607.     int bytes_read = 0;

  608. 

  609.     while (bytes_read < klv->length) {

  610.         int tag = get_be16(pb);

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

  612. 

  613.         dprintf("tag 0x%04X, size %d\n", tag, size);

  614.         switch (tag) {

  615.         case 0x3C0A:

  616.             get_buffer(pb, descriptor->uid, 16);

  617.             break;

  618.         case 0x3004:

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

  620.             break;

  621.         case 0x3006:

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

  623.             break;

  624.         case 0x3201: /* PictureEssenceCoding */

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

  626.             break;

  627.         case 0x3203:

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

  629.             break;

  630.         case 0x3202:

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

  632.             break;

  633.         case 0x320E:

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

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

  636.             break;

  637.         case 0x3D03:

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

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

  640.             break;

  641.         case 0x3D06: /* SoundEssenceCompression */

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

  643.             break;

  644.         case 0x3D07:

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

  646.             break;

  647.         case 0x3D01:

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

  649.             break;

  650.         case 0x3401:

  651.             mxf_read_metadata_pixel_layout(pb, descriptor);

  652.             break;

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

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

  655.             descriptor->extradata_size = size;

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

  657.             break;

  658.         default:

  659.             url_fskip(pb, size);

  660.         }

  661.         bytes_read += size + 4;

  662.     }

  663.     descriptor->type = Descriptor;

  664.     return mxf_add_metadata_set(mxf, descriptor);

  665. }

  666. 

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

  668. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

  669.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },

  670.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },

  671.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  672.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  673. };

  674. 

  675. static const MXFCodecUL mxf_codec_uls[] = {

  676.     /* PictureEssenceCoding */

  677.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  678.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  679.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  680.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  681.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  682.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  683.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  684.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  685.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  686.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  687.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  688.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  689.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  690.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  691.     /* SoundEssenceCompression */

  692.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  693.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  694.     { { 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 */

  695.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },

  696.     { { 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 */

  697.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  698.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  699.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  700.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  701. };

  702. 

  703. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  704.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  705.     { { 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 */

  706.     { { 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 */

  707.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  708. };

  709. 

  710. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  711.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  712.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  713.     { { 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 */

  714.     { { 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 */

  715.     { { 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 */

  716.     { { 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 */

  717.     { { 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 */

  718.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  719. };

  720. 

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

  722. {

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

  724.         if(!memcmp(uls->uid, *uid, 16))

  725.             break;

  726.         uls++;

  727.     }

  728.     return uls;

  729. }

  730. 

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

  732. {

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

  734.         if(!memcmp(uls->uid, *uid, 16))

  735.             break;

  736.         uls++;

  737.     }

  738.     return uls->type;

  739. }

  740. 

  741. static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref)

  742. {

  743.     int i;

  744. 

  745.     if (!strong_ref)

  746.         return NULL;

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

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

  749.             return mxf->metadata_sets[i];

  750.         }

  751.     }

  752.     return NULL;

  753. }

  754. 

  755. static int mxf_parse_structural_metadata(MXFContext *mxf)

  756. {

  757.     MXFPackage *material_package = NULL;

  758.     MXFPackage *source_package = NULL;

  759.     MXFPackage *temp_package = NULL;

  760.     int i, j, k;

  761. 

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

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

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

  765.         if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i]))) {

  766.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve package strong ref\n");

  767.             return -1;

  768.         }

  769.         if (temp_package->type == MaterialPackage) {

  770.             material_package = temp_package;

  771.             break;

  772.         }

  773.     }

  774.     if (!material_package) {

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

  776.         return -1;

  777.     }

  778. 

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

  780.         MXFTrack *material_track = NULL;

  781.         MXFTrack *source_track = NULL;

  782.         MXFTrack *temp_track = NULL;

  783.         MXFDescriptor *descriptor = NULL;

  784.         MXFStructuralComponent *component = NULL;

  785.         const MXFCodecUL *codec_ul = NULL;

  786.         const MXFCodecUL *container_ul = NULL;

  787.         AVStream *st;

  788. 

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

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

  791.             continue;

  792.         }

  793. 

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

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

  796.             return -1;

  797.         }

  798. 

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

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

  801.             /* TODO: handle timecode component */

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

  803.             if (!component || component->type != SourceClip)

  804.                 continue;

  805. 

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

  807.                 if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k]))) {

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

  809.                     return -1;

  810.                 }

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

  812.                     source_package = temp_package;

  813.                     break;

  814.                 }

  815.             }

  816.             if (!source_package) {

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

  818.                 break;

  819.             }

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

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

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

  823.                     return -1;

  824.                 }

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

  826.                     source_track = temp_track;

  827.                     break;

  828.                 }

  829.             }

  830.             if (!source_track) {

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

  832.                 break;

  833.             }

  834.         }

  835.         if (!source_track)

  836.             continue;

  837. 

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

  839.         st->priv_data = source_track;

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

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

  842.             st->duration = AV_NOPTS_VALUE;

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

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

  845. 

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

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

  848.             return -1;

  849.         }

  850. 

  851. #ifdef DEBUG

  852.         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);

  853. #endif

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

  855. 

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

  857.         if (source_package->descriptor) {

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

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

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

  861. 

  862.                     if (!sub_descriptor) {

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

  864.                         continue;

  865.                     }

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

  867.                         descriptor = sub_descriptor;

  868.                         break;

  869.                     }

  870.                 }

  871.             } else

  872.                 descriptor = source_package->descriptor;

  873.         }

  874.         if (!descriptor) {

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

  876.             continue;

  877.         }

  878. #ifdef DEBUG

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

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

  881. #endif

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

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

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

  885.         if (descriptor->extradata) {

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

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

  888.         }

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

  890.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);

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

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

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

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

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

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

  897.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);

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

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

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

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

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

  903.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

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

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

  917.                 st->need_parsing = 1;

  918.             }

  919.         }

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

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

  922.             st->need_parsing = 1;

  923.         }

  924.     }

  925.     return 0;

  926. }

  927. 

  928. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  929.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },

  930.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },

  931.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },

  932.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },

  933.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },

  934.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },

  935.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },

  936.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */

  937.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */

  938.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */

  939.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */

  940.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */

  941.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */

  942.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */

  943.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */

  944.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },

  945. };

  946. 

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

  948. {

  949.     int i, b;

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

  951.         b = get_byte(pb);

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

  953.             i = 0;

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

  955.             i = -1;

  956.     }

  957.     return i == size;

  958. }

  959. 

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

  961. {

  962.     MXFContext *mxf = s->priv_data;

  963.     KLVPacket klv;

  964. 

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

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

  967.         return -1;

  968.     }

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

  970.     mxf->fc = s;

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

  972.         const MXFMetadataReadTableEntry *function;

  973. 

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

  975.             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");

  976.             return -1;

  977.         }

  978. #ifdef DEBUG

  979.         PRINT_KEY("read header", klv.key);

  980. #endif

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

  982.             /* FIXME avoid seek */

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

  984.             break;

  985.         }

  986. 

  987.         for (function = mxf_metadata_read_table; function->read; function++) {

  988.             if (IS_KLV_KEY(klv.key, function->key)) {

  989.                 if (function->read(mxf, &klv) < 0) {

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

  991.                     return -1;

  992.                 }

  993.                 break;

  994.             }

  995.         }

  996.         if (!function->read)

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

  998.     }

  999.     return mxf_parse_structural_metadata(mxf);

  1000. }

  1001. 

  1002. static int mxf_read_close(AVFormatContext *s)

  1003. {

  1004.     MXFContext *mxf = s->priv_data;

  1005.     int i;

  1006. 

  1007.     av_freep(&mxf->packages_refs);

  1008.     av_freep(&mxf->essence_container_data_sets_refs);

  1009.     av_freep(&mxf->essence_containers_uls);

  1010.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1011.         switch (mxf->metadata_sets[i]->type) {

  1012.         case MultipleDescriptor:

  1013.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1014.             break;

  1015.         case Sequence:

  1016.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1017.             break;

  1018.         case SourcePackage:

  1019.         case MaterialPackage:

  1020.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1021.             break;

  1022.         default:

  1023.             break;

  1024.         }

  1025.         av_freep(&mxf->metadata_sets[i]);

  1026.     }

  1027.     av_freep(&mxf->metadata_sets);

  1028.     return 0;

  1029. }

  1030. 

  1031. static int mxf_probe(AVProbeData *p) {

  1032.     uint8_t *bufp = p->buf;

  1033.     uint8_t *end = p->buf + p->buf_size;

  1034. 

  1035.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1036.         return 0;

  1037. 

  1038.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1039.     end -= sizeof(mxf_header_partition_pack_key);

  1040.     for (; bufp < end; bufp++) {

  1041.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1042.             return AVPROBE_SCORE_MAX;

  1043.     }

  1044.     return 0;

  1045. }

  1046. 

  1047. /* rudimentary binary seek */

  1048. /* XXX: use MXF Index */

  1049. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1050. {

  1051.     AVStream *st = s->streams[stream_index];

  1052.     int64_t seconds;

  1053. 

  1054.     if (!s->bit_rate)

  1055.         return -1;

  1056.     if (sample_time < 0)

  1057.         sample_time = 0;

  1058.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1059.     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1060.     if (!mxf_read_sync(&s->pb, mxf_essence_element_key, 12))

  1061.         return -1;

  1062. 

  1063.     /* found KLV key */

  1064.     url_fseek(&s->pb, -12, SEEK_CUR);

  1065.     av_update_cur_dts(s, st, sample_time);

  1066.     return 0;

  1067. }

  1068. 

  1069. AVInputFormat mxf_demuxer = {

  1070.     "mxf",

  1071.     "MXF format",

  1072.     sizeof(MXFContext),

  1073.     mxf_probe,

  1074.     mxf_read_header,

  1075.     mxf_read_packet,

  1076.     mxf_read_close,

  1077.     mxf_read_seek,

  1078. };