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

  376.             continue;

  377.         }

  378.         switch (tag) {

  379.         case 0x3C0A:

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

  381.             break;

  382.         case 0x0202:

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

  384.             break;

  385.         case 0x1201:

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

  387.             break;

  388.         case 0x1101:

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

  390.             url_fskip(pb, 16);

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

  392.             break;

  393.         case 0x1102:

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

  395.             break;

  396.         default:

  397.             url_fskip(pb, size);

  398.         }

  399.     }

  400.     source_clip->type = SourceClip;

  401.     return mxf_add_metadata_set(mxf, source_clip);

  402. }

  403. 

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

  405. {

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

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

  408.     int bytes_read = 0;

  409. 

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

  411.         int tag = get_be16(pb);

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

  413. 

  414.         switch (tag) {

  415.         case 0x3C0A:

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

  417.             break;

  418.         case 0x4403:

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

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

  421.                 return -1;

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

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

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

  425.             break;

  426.         default:

  427.             url_fskip(pb, size);

  428.         }

  429.         bytes_read += size + 4;

  430.     }

  431.     package->type = MaterialPackage;

  432.     return mxf_add_metadata_set(mxf, package);

  433. }

  434. 

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

  436. {

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

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

  439.     int bytes_read = 0;

  440. 

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

  442.         int tag = get_be16(pb);

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

  444. 

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

  446.         switch (tag) {

  447.         case 0x3C0A:

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

  449.             break;

  450.         case 0x4801:

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

  452.             break;

  453.         case 0x4804:

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

  455.             break;

  456.         case 0x4B01:

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

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

  459.             break;

  460.         case 0x4803:

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

  462.             break;

  463.         default:

  464.             url_fskip(pb, size);

  465.         }

  466.         bytes_read += size + 4;

  467.     }

  468.     track->type = Track;

  469.     return mxf_add_metadata_set(mxf, track);

  470. }

  471. 

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

  473. {

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

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

  476.     int bytes_read = 0;

  477. 

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

  479.         int tag = get_be16(pb);

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

  481. 

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

  483.         switch (tag) {

  484.         case 0x3C0A:

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

  486.             break;

  487.         case 0x0202:

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

  489.             break;

  490.         case 0x0201:

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

  492.             break;

  493.         case 0x1001:

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

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

  496.                 return -1;

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

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

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

  500.             break;

  501.         default:

  502.             url_fskip(pb, size);

  503.         }

  504.         bytes_read += size + 4;

  505.     }

  506.     sequence->type = Sequence;

  507.     return mxf_add_metadata_set(mxf, sequence);

  508. }

  509. 

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

  511. {

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

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

  514.     int bytes_read = 0;

  515. 

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

  517.         int tag = get_be16(pb);

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

  519. 

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

  521.         switch (tag) {

  522.         case 0x3C0A:

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

  524.             break;

  525.         case 0x4403:

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

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

  528.                 return -1;

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

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

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

  532.             break;

  533.         case 0x4401:

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

  535.             url_fskip(pb, 16);

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

  537.             break;

  538.         case 0x4701:

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

  540.             break;

  541.         default:

  542.             url_fskip(pb, size);

  543.         }

  544.         bytes_read += size + 4;

  545.     }

  546.     package->type = SourcePackage;

  547.     return mxf_add_metadata_set(mxf, package);

  548. }

  549. 

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

  551. {

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

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

  554.     int bytes_read = 0;

  555. 

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

  557.         int tag = get_be16(pb);

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

  559. 

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

  561.         switch (tag) {

  562.         case 0x3C0A:

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

  564.             break;

  565.         case 0x3F01:

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

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

  568.                 return -1;

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

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

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

  572.             break;

  573.         default:

  574.             url_fskip(pb, size);

  575.         }

  576.         bytes_read += size + 4;

  577.     }

  578.     descriptor->type = MultipleDescriptor;

  579.     return mxf_add_metadata_set(mxf, descriptor);

  580. }

  581. 

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

  583. {

  584.     int code;

  585. 

  586.     do {

  587.         code = get_byte(pb);

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

  589.         switch (code) {

  590.         case 0x52: /* R */

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

  592.             break;

  593.         case 0x47: /* G */

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

  595.             break;

  596.         case 0x42: /* B */

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

  598.             break;

  599.         default:

  600.             get_byte(pb);

  601.         }

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

  603. }

  604. 

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

  606. {

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

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

  609.     int bytes_read = 0;

  610. 

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

  612.         int tag = get_be16(pb);

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

  614. 

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

  616.         switch (tag) {

  617.         case 0x3C0A:

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

  619.             break;

  620.         case 0x3004:

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

  622.             break;

  623.         case 0x3006:

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

  625.             break;

  626.         case 0x3201: /* PictureEssenceCoding */

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

  628.             break;

  629.         case 0x3203:

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

  631.             break;

  632.         case 0x3202:

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

  634.             break;

  635.         case 0x320E:

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

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

  638.             break;

  639.         case 0x3D03:

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

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

  642.             break;

  643.         case 0x3D06: /* SoundEssenceCompression */

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

  645.             break;

  646.         case 0x3D07:

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

  648.             break;

  649.         case 0x3D01:

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

  651.             break;

  652.         case 0x3401:

  653.             mxf_read_metadata_pixel_layout(pb, descriptor);

  654.             break;

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

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

  657.             descriptor->extradata_size = size;

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

  659.             break;

  660.         default:

  661.             url_fskip(pb, size);

  662.         }

  663.         bytes_read += size + 4;

  664.     }

  665.     descriptor->type = Descriptor;

  666.     return mxf_add_metadata_set(mxf, descriptor);

  667. }

  668. 

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

  670. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

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

  672.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },

  673.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  674.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  675. };

  676. 

  677. static const MXFCodecUL mxf_codec_uls[] = {

  678.     /* PictureEssenceCoding */

  679.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

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

  681.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  682.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  683.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  684.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  685.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  686.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  687.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  688.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  689.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  690.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  691.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  692.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  693.     /* SoundEssenceCompression */

  694.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  695.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  696.     { { 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 */

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

  698.     { { 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 */

  699.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  700.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  701.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  702.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  703. };

  704. 

  705. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  706.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  707.     { { 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 */

  708.     { { 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 */

  709.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  710. };

  711. 

  712. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  713.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  714.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  715.     { { 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 */

  716.     { { 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 */

  717.     { { 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 */

  718.     { { 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 */

  719.     { { 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 */

  720.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  721. };

  722. 

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

  724. {

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

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

  727.             break;

  728.         uls++;

  729.     }

  730.     return uls;

  731. }

  732. 

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

  734. {

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

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

  737.             break;

  738.         uls++;

  739.     }

  740.     return uls->type;

  741. }

  742. 

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

  744. {

  745.     int i;

  746. 

  747.     if (!strong_ref)

  748.         return NULL;

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

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

  751.             return mxf->metadata_sets[i];

  752.         }

  753.     }

  754.     return NULL;

  755. }

  756. 

  757. static int mxf_parse_structural_metadata(MXFContext *mxf)

  758. {

  759.     MXFPackage *material_package = NULL;

  760.     MXFPackage *source_package = NULL;

  761.     MXFPackage *temp_package = NULL;

  762.     int i, j, k;

  763. 

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

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

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

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

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

  769.             return -1;

  770.         }

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

  772.             material_package = temp_package;

  773.             break;

  774.         }

  775.     }

  776.     if (!material_package) {

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

  778.         return -1;

  779.     }

  780. 

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

  782.         MXFTrack *material_track = NULL;

  783.         MXFTrack *source_track = NULL;

  784.         MXFTrack *temp_track = NULL;

  785.         MXFDescriptor *descriptor = NULL;

  786.         MXFStructuralComponent *component = NULL;

  787.         const MXFCodecUL *codec_ul = NULL;

  788.         const MXFCodecUL *container_ul = NULL;

  789.         AVStream *st;

  790. 

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

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

  793.             continue;

  794.         }

  795. 

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

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

  798.             return -1;

  799.         }

  800. 

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

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

  803.             /* TODO: handle timecode component */

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

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

  806.                 continue;

  807. 

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

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

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

  811.                     return -1;

  812.                 }

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

  814.                     source_package = temp_package;

  815.                     break;

  816.                 }

  817.             }

  818.             if (!source_package) {

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

  820.                 break;

  821.             }

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

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

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

  825.                     return -1;

  826.                 }

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

  828.                     source_track = temp_track;

  829.                     break;

  830.                 }

  831.             }

  832.             if (!source_track) {

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

  834.                 break;

  835.             }

  836.         }

  837.         if (!source_track)

  838.             continue;

  839. 

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

  841.         st->priv_data = source_track;

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

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

  844.             st->duration = AV_NOPTS_VALUE;

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

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

  847. 

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

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

  850.             return -1;

  851.         }

  852. 

  853. #ifdef DEBUG

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

  855. #endif

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

  857. 

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

  859.         if (source_package->descriptor) {

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

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

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

  863. 

  864.                     if (!sub_descriptor) {

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

  866.                         continue;

  867.                     }

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

  869.                         descriptor = sub_descriptor;

  870.                         break;

  871.                     }

  872.                 }

  873.             } else

  874.                 descriptor = source_package->descriptor;

  875.         }

  876.         if (!descriptor) {

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

  878.             continue;

  879.         }

  880. #ifdef DEBUG

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

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

  883. #endif

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

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

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

  887.         if (descriptor->extradata) {

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

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

  890.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  905.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

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

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

  919.                 st->need_parsing = 1;

  920.             }

  921.         }

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

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

  924.             st->need_parsing = 1;

  925.         }

  926.     }

  927.     return 0;

  928. }

  929. 

  930. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  931.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },

  932.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },

  933.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },

  934.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },

  935.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },

  936.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },

  937.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },

  938.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */

  939.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */

  940.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */

  941.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */

  942.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */

  943.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */

  944.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */

  945.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */

  946.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },

  947. };

  948. 

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

  950. {

  951.     int i, b;

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

  953.         b = get_byte(pb);

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

  955.             i = 0;

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

  957.             i = -1;

  958.     }

  959.     return i == size;

  960. }

  961. 

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

  963. {

  964.     MXFContext *mxf = s->priv_data;

  965.     KLVPacket klv;

  966. 

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

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

  969.         return -1;

  970.     }

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

  972.     mxf->fc = s;

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

  974.         const MXFMetadataReadTableEntry *function;

  975. 

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

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

  978.             return -1;

  979.         }

  980. #ifdef DEBUG

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

  982. #endif

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

  984.             /* FIXME avoid seek */

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

  986.             break;

  987.         }

  988. 

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

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

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

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

  993.                     return -1;

  994.                 }

  995.                 break;

  996.             }

  997.         }

  998.         if (!function->read)

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

  1000.     }

  1001.     return mxf_parse_structural_metadata(mxf);

  1002. }

  1003. 

  1004. static int mxf_read_close(AVFormatContext *s)

  1005. {

  1006.     MXFContext *mxf = s->priv_data;

  1007.     int i;

  1008. 

  1009.     av_freep(&mxf->packages_refs);

  1010.     av_freep(&mxf->essence_container_data_sets_refs);

  1011.     av_freep(&mxf->essence_containers_uls);

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

  1013.         switch (mxf->metadata_sets[i]->type) {

  1014.         case MultipleDescriptor:

  1015.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1016.             break;

  1017.         case Sequence:

  1018.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1019.             break;

  1020.         case SourcePackage:

  1021.         case MaterialPackage:

  1022.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1023.             break;

  1024.         default:

  1025.             break;

  1026.         }

  1027.         av_freep(&mxf->metadata_sets[i]);

  1028.     }

  1029.     av_freep(&mxf->metadata_sets);

  1030.     return 0;

  1031. }

  1032. 

  1033. static int mxf_probe(AVProbeData *p) {

  1034.     uint8_t *bufp = p->buf;

  1035.     uint8_t *end = p->buf + p->buf_size;

  1036. 

  1037.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1038.         return 0;

  1039. 

  1040.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1041.     end -= sizeof(mxf_header_partition_pack_key);

  1042.     for (; bufp < end; bufp++) {

  1043.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1044.             return AVPROBE_SCORE_MAX;

  1045.     }

  1046.     return 0;

  1047. }

  1048. 

  1049. /* rudimentary binary seek */

  1050. /* XXX: use MXF Index */

  1051. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1052. {

  1053.     AVStream *st = s->streams[stream_index];

  1054.     int64_t seconds;

  1055. 

  1056.     if (!s->bit_rate)

  1057.         return -1;

  1058.     if (sample_time < 0)

  1059.         sample_time = 0;

  1060.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1061.     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1062.     if (!mxf_read_sync(&s->pb, mxf_essence_element_key, 12))

  1063.         return -1;

  1064. 

  1065.     /* found KLV key */

  1066.     url_fseek(&s->pb, -12, SEEK_CUR);

  1067.     av_update_cur_dts(s, st, sample_time);

  1068.     return 0;

  1069. }

  1070. 

  1071. AVInputFormat mxf_demuxer = {

  1072.     "mxf",

  1073.     "MXF format",

  1074.     sizeof(MXFContext),

  1075.     mxf_probe,

  1076.     mxf_read_header,

  1077.     mxf_read_packet,

  1078.     mxf_read_close,

  1079.     mxf_read_seek,

  1080. };