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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 library is free software; you can redistribute it and/or

  6.  * modify it under the terms of the GNU Lesser General Public

  7.  * License as published by the Free Software Foundation; either

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU Lesser General Public

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  18.  */

  19. 

  20. /*

  21.  * References

  22.  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value

  23.  * SMPTE 377M MXF File Format Specifications

  24.  * SMPTE 378M Operational Pattern 1a

  25.  * SMPTE 379M MXF Generic Container

  26.  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container

  27.  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container

  28.  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container

  29.  *

  30.  * Principle

  31.  * Search for Track numbers which will identify essence element KLV packets.

  32.  * Search for SourcePackage which define tracks which contains Track numbers.

  33.  * Material Package contains tracks with reference to SourcePackage tracks.

  34.  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.

  35.  * Assign Descriptors to correct Tracks.

  36.  *

  37.  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.

  38.  * Metadata parsing resolves Strong References to objects.

  39.  *

  40.  * Simple demuxer, only OP1A supported and some files might not work at all.

  41.  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1

  42.  */

  43. 

  44. //#define DEBUG

  45. 

  46. #include "avformat.h"

  47. 

  48. typedef uint8_t UID[16];

  49. 

  50. enum MXFMetadataSetType {

  51.     MaterialPackage,

  52.     SourcePackage,

  53.     SourceClip,

  54.     TimecodeComponent,

  55.     Sequence,

  56.     MultipleDescriptor,

  57.     Descriptor,

  58.     Track,

  59.     EssenceContainerData,

  60. };

  61. 

  62. typedef struct MXFStructuralComponent {

  63.     UID uid;

  64.     enum MXFMetadataSetType type;

  65.     UID source_package_uid;

  66.     UID data_definition_ul;

  67.     int64_t duration;

  68.     int64_t start_position;

  69.     int source_track_id;

  70. } MXFStructuralComponent;

  71. 

  72. typedef struct MXFSequence {

  73.     UID uid;

  74.     enum MXFMetadataSetType type;

  75.     UID data_definition_ul;

  76.     UID *structural_components_refs;

  77.     int structural_components_count;

  78.     int64_t duration;

  79. } MXFSequence;

  80. 

  81. typedef struct MXFTrack {

  82.     UID uid;

  83.     enum MXFMetadataSetType type;

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

  85.     UID sequence_ref;

  86.     int track_id;

  87.     uint8_t track_number[4];

  88.     AVRational edit_rate;

  89. } MXFTrack;

  90. 

  91. typedef struct MXFDescriptor {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID essence_container_ul;

  95.     UID essence_codec_ul;

  96.     AVRational sample_rate;

  97.     AVRational aspect_ratio;

  98.     int width;

  99.     int height;

  100.     int channels;

  101.     int bits_per_sample;

  102.     UID *sub_descriptors_refs;

  103.     int sub_descriptors_count;

  104.     int linked_track_id;

  105.     uint8_t *extradata;

  106.     int extradata_size;

  107. } MXFDescriptor;

  108. 

  109. typedef struct MXFPackage {

  110.     UID uid;

  111.     enum MXFMetadataSetType type;

  112.     UID package_uid;

  113.     UID *tracks_refs;

  114.     int tracks_count;

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

  116.     UID descriptor_ref;

  117. } MXFPackage;

  118. 

  119. typedef struct MXFEssenceContainerData {

  120.     UID uid;

  121.     enum MXFMetadataSetType type;

  122.     UID linked_package_uid;

  123. } MXFEssenceContainerData;

  124. 

  125. typedef struct {

  126.     UID uid;

  127.     enum MXFMetadataSetType type;

  128. } MXFMetadataSet;

  129. 

  130. typedef struct MXFContext {

  131.     UID *packages_refs;

  132.     int packages_count;

  133.     UID *essence_container_data_sets_refs;

  134.     int essence_container_data_sets_count;

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

  136.     int essence_containers_uls_count;

  137.     UID operational_pattern_ul;

  138.     UID content_storage_uid;

  139.     MXFMetadataSet **metadata_sets;

  140.     int metadata_sets_count;

  141.     AVFormatContext *fc;

  142. } MXFContext;

  143. 

  144. typedef struct KLVPacket {

  145.     UID key;

  146.     offset_t offset;

  147.     uint64_t length;

  148. } KLVPacket;

  149. 

  150. enum MXFWrappingScheme {

  151.     Frame,

  152.     Clip,

  153. };

  154. 

  155. typedef struct MXFCodecUL {

  156.     UID uid;

  157.     enum CodecID id;

  158.     enum MXFWrappingScheme wrapping;

  159. } MXFCodecUL;

  160. 

  161. typedef struct MXFDataDefinitionUL {

  162.     UID uid;

  163.     enum CodecType type;

  164. } MXFDataDefinitionUL;

  165. 

  166. typedef struct MXFMetadataReadTableEntry {

  167.     const UID key;

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

  169. } MXFMetadataReadTableEntry;

  170. 

  171. /* partial keys to match */

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

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

  174. 

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

  176. 

  177. #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, \

  178.                              (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])

  179. 

  180. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  181. {

  182.     int64_t size = 0;

  183.     uint8_t length = get_byte(pb);

  184.     int type = length >> 7;

  185. 

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

  187.         int bytes_num = length & 0x7f;

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

  189.         if (bytes_num > 8)

  190.             return -1;

  191.         while (bytes_num--)

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

  193.     } else {

  194.         size = length & 0x7f;

  195.     }

  196.     return size;

  197. }

  198. 

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

  200. {

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

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

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

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

  205. }

  206. 

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

  208. {

  209.     int i;

  210. 

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

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

  213.          /* SMPTE 379M 7.3 */

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

  215.             return i;

  216.     }

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

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

  219. }

  220. 

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

  222. {

  223.     KLVPacket klv;

  224. 

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

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

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

  228.             return -1;

  229.         }

  230. #ifdef DEBUG

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

  232. #endif

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

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

  235.             pkt->stream_index = mxf_get_stream_index(s, &klv);

  236.             return pkt->stream_index == -1 ? -1 : 0;

  237.         } else

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

  239.     }

  240.     return AVERROR_IO;

  241. }

  242. 

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

  244. {

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

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

  247.     mxf->metadata_sets_count++;

  248.     return 0;

  249. }

  250. 

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

  252. {

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

  254.     int bytes_read = 0;

  255. 

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

  257.         int tag = get_be16(pb);

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

  259. 

  260.         switch (tag) {

  261.         case 0x3B03:

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

  263.             break;

  264.         case 0x3B09:

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

  266.             break;

  267.         case 0x3B0A:

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

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

  270.                 return -1;

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

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

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

  274.             break;

  275.         default:

  276.             url_fskip(pb, size);

  277.         }

  278.         bytes_read += size + 4;

  279.     }

  280.     return 0;

  281. }

  282. 

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

  284. {

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

  286.     int bytes_read = 0;

  287. 

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

  289.         int tag = get_be16(pb);

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

  291. 

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

  293.         switch (tag) {

  294.         case 0x1901:

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

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

  297.                 return -1;

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

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

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

  301.             break;

  302.         case 0x1902:

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

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

  305.                 return -1;

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

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

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

  309.             break;

  310.         default:

  311.             url_fskip(pb, size);

  312.         }

  313.         bytes_read += size + 4;

  314.     }

  315.     return 0;

  316. }

  317. 

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

  319. {

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

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

  322.     int bytes_read = 0;

  323. 

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

  325.         int tag = get_be16(pb);

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

  327. 

  328.         bytes_read += size + 4;

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

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

  331.             continue;

  332.         switch (tag) {

  333.         case 0x3C0A:

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

  335.             break;

  336.         case 0x0202:

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

  338.             break;

  339.         case 0x1201:

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

  341.             break;

  342.         case 0x1101:

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

  344.             url_fskip(pb, 16);

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

  346.             break;

  347.         case 0x1102:

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

  349.             break;

  350.         default:

  351.             url_fskip(pb, size);

  352.         }

  353.     }

  354.     source_clip->type = SourceClip;

  355.     return mxf_add_metadata_set(mxf, source_clip);

  356. }

  357. 

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

  359. {

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

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

  362.     int bytes_read = 0;

  363. 

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

  365.         int tag = get_be16(pb);

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

  367. 

  368.         switch (tag) {

  369.         case 0x3C0A:

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

  371.             break;

  372.         case 0x4403:

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

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

  375.                 return -1;

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

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

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

  379.             break;

  380.         default:

  381.             url_fskip(pb, size);

  382.         }

  383.         bytes_read += size + 4;

  384.     }

  385.     package->type = MaterialPackage;

  386.     return mxf_add_metadata_set(mxf, package);

  387. }

  388. 

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

  390. {

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

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

  393.     int bytes_read = 0;

  394. 

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

  396.         int tag = get_be16(pb);

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

  398. 

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

  400.         switch (tag) {

  401.         case 0x3C0A:

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

  403.             break;

  404.         case 0x4801:

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

  406.             break;

  407.         case 0x4804:

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

  409.             break;

  410.         case 0x4B01:

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

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

  413.             break;

  414.         case 0x4803:

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

  416.             break;

  417.         default:

  418.             url_fskip(pb, size);

  419.         }

  420.         bytes_read += size + 4;

  421.     }

  422.     track->type = Track;

  423.     return mxf_add_metadata_set(mxf, track);

  424. }

  425. 

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

  427. {

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

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

  430.     int bytes_read = 0;

  431. 

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

  433.         int tag = get_be16(pb);

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

  435. 

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

  437.         switch (tag) {

  438.         case 0x3C0A:

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

  440.             break;

  441.         case 0x0202:

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

  443.             break;

  444.         case 0x0201:

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

  446.             break;

  447.         case 0x1001:

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

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

  450.                 return -1;

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

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

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

  454.             break;

  455.         default:

  456.             url_fskip(pb, size);

  457.         }

  458.         bytes_read += size + 4;

  459.     }

  460.     sequence->type = Sequence;

  461.     return mxf_add_metadata_set(mxf, sequence);

  462. }

  463. 

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

  465. {

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

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

  468.     int bytes_read = 0;

  469. 

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

  471.         int tag = get_be16(pb);

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

  473. 

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

  475.         switch (tag) {

  476.         case 0x3C0A:

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

  478.             break;

  479.         case 0x4403:

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

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

  482.                 return -1;

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

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

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

  486.             break;

  487.         case 0x4401:

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

  489.             url_fskip(pb, 16);

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

  491.             break;

  492.         case 0x4701:

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

  494.             break;

  495.         default:

  496.             url_fskip(pb, size);

  497.         }

  498.         bytes_read += size + 4;

  499.     }

  500.     package->type = SourcePackage;

  501.     return mxf_add_metadata_set(mxf, package);

  502. }

  503. 

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

  505. {

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

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

  508.     int bytes_read = 0;

  509. 

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

  511.         int tag = get_be16(pb);

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

  513. 

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

  515.         switch (tag) {

  516.         case 0x3C0A:

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

  518.             break;

  519.         case 0x3F01:

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

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

  522.                 return -1;

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

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

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

  526.             break;

  527.         default:

  528.             url_fskip(pb, size);

  529.         }

  530.         bytes_read += size + 4;

  531.     }

  532.     descriptor->type = MultipleDescriptor;

  533.     return mxf_add_metadata_set(mxf, descriptor);

  534. }

  535. 

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

  537. {

  538.     int code;

  539. 

  540.     do {

  541.         code = get_byte(pb);

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

  543.         switch (code) {

  544.         case 0x52: /* R */

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

  546.             break;

  547.         case 0x47: /* G */

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

  549.             break;

  550.         case 0x42: /* B */

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

  552.             break;

  553.         default:

  554.             get_byte(pb);

  555.         }

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

  557. }

  558. 

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

  560. {

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

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

  563.     int bytes_read = 0;

  564. 

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

  566.         int tag = get_be16(pb);

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

  568. 

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

  570.         switch (tag) {

  571.         case 0x3C0A:

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

  573.             break;

  574.         case 0x3004:

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

  576.             break;

  577.         case 0x3006:

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

  579.             break;

  580.         case 0x3201: /* PictureEssenceCoding */

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

  582.             break;

  583.         case 0x3203:

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

  585.             break;

  586.         case 0x3202:

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

  588.             break;

  589.         case 0x320E:

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

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

  592.             break;

  593.         case 0x3D03:

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

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

  596.             break;

  597.         case 0x3D06: /* SoundEssenceCompression */

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

  599.             break;

  600.         case 0x3D07:

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

  602.             break;

  603.         case 0x3D01:

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

  605.             break;

  606.         case 0x3401:

  607.             mxf_read_metadata_pixel_layout(pb, descriptor);

  608.             break;

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

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

  611.             descriptor->extradata_size = size;

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

  613.             break;

  614.         default:

  615.             url_fskip(pb, size);

  616.         }

  617.         bytes_read += size + 4;

  618.     }

  619.     descriptor->type = Descriptor;

  620.     return mxf_add_metadata_set(mxf, descriptor);

  621. }

  622. 

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

  624. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

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

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

  627.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  628.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  629. };

  630. 

  631. static const MXFCodecUL mxf_codec_uls[] = {

  632.     /* PictureEssenceCoding */

  633.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  634.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  635.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  636.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  637.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  638.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  639.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  640.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  641.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  642.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  643.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  644.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  645.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  646.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  647.     /* SoundEssenceCompression */

  648.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  649.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  650.     { { 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 */

  651.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },

  652.     { { 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 */

  653.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  654.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  655.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  656.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  657. };

  658. 

  659. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  660.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  661.     { { 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 */

  662.     { { 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 */

  663.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  664. };

  665. 

  666. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  667.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  668.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  669.     { { 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 */

  670.     { { 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 */

  671.     { { 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 */

  672.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },   CODEC_ID_PCM_AES3, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */

  673.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  674. };

  675. 

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

  677. {

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

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

  680.             break;

  681.         uls++;

  682.     }

  683.     return uls;

  684. }

  685. 

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

  687. {

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

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

  690.             break;

  691.         uls++;

  692.     }

  693.     return uls->type;

  694. }

  695. 

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

  697. {

  698.     int i;

  699. 

  700.     if (!strong_ref)

  701.         return NULL;

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

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

  704.             return mxf->metadata_sets[i];

  705.         }

  706.     }

  707.     return NULL;

  708. }

  709. 

  710. static int mxf_parse_structural_metadata(MXFContext *mxf)

  711. {

  712.     MXFPackage *material_package = NULL;

  713.     MXFPackage *source_package = NULL;

  714.     MXFPackage *temp_package = NULL;

  715.     int i, j, k;

  716. 

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

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

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

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

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

  722.             return -1;

  723.         }

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

  725.             material_package = temp_package;

  726.             break;

  727.         }

  728.     }

  729.     if (!material_package) {

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

  731.         return -1;

  732.     }

  733. 

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

  735.         MXFTrack *material_track = NULL;

  736.         MXFTrack *source_track = NULL;

  737.         MXFTrack *temp_track = NULL;

  738.         MXFDescriptor *descriptor = NULL;

  739.         MXFStructuralComponent *component = NULL;

  740.         const MXFCodecUL *codec_ul = NULL;

  741.         const MXFCodecUL *container_ul = NULL;

  742.         AVStream *st;

  743. 

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

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

  746.             continue;

  747.         }

  748. 

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

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

  751.             return -1;

  752.         }

  753. 

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

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

  756.             /* TODO: handle timecode component */

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

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

  759.                 continue;

  760. 

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

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

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

  764.                     return -1;

  765.                 }

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

  767.                     source_package = temp_package;

  768.                     break;

  769.                 }

  770.             }

  771.             if (!source_package) {

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

  773.                 break;

  774.             }

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

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

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

  778.                     return -1;

  779.                 }

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

  781.                     source_track = temp_track;

  782.                     break;

  783.                 }

  784.             }

  785.             if (!source_track) {

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

  787.                 break;

  788.             }

  789.         }

  790.         if (!source_track)

  791.             continue;

  792. 

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

  794.         st->priv_data = source_track;

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

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

  797.             st->duration = AV_NOPTS_VALUE;

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

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

  800. 

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

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

  803.             return -1;

  804.         }

  805. 

  806. #ifdef DEBUG

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

  808. #endif

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

  810. 

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

  812.         if (source_package->descriptor) {

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

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

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

  816. 

  817.                     if (!sub_descriptor) {

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

  819.                         continue;

  820.                     }

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

  822.                         descriptor = sub_descriptor;

  823.                         break;

  824.                     }

  825.                 }

  826.             } else

  827.                 descriptor = source_package->descriptor;

  828.         }

  829.         if (!descriptor) {

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

  831.             continue;

  832.         }

  833. #ifdef DEBUG

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

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

  836. #endif

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

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

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

  840.         if (descriptor->extradata) {

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

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

  843.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  858.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  870.                 st->need_parsing = 1;

  871.             }

  872.         }

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

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

  875.             st->need_parsing = 1;

  876.         }

  877.     }

  878.     return 0;

  879. }

  880. 

  881. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  882.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },

  883.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },

  884.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },

  885.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },

  886.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },

  887.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },

  888.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },

  889.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */

  890.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */

  891.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */

  892.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */

  893.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */

  894.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */

  895.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */

  896.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */

  897.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },

  898. };

  899. 

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

  901. {

  902.     MXFContext *mxf = s->priv_data;

  903.     KLVPacket klv;

  904. 

  905.     mxf->fc = s;

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

  907.         const MXFMetadataReadTableEntry *function;

  908. 

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

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

  911.             return -1;

  912.         }

  913. #ifdef DEBUG

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

  915. #endif

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

  917.             /* FIXME avoid seek */

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

  919.             break;

  920.         }

  921. 

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

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

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

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

  926.                     return -1;

  927.                 }

  928.                 break;

  929.             }

  930.         }

  931.         if (!function->read)

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

  933.     }

  934.     return mxf_parse_structural_metadata(mxf);

  935. }

  936. 

  937. static int mxf_read_close(AVFormatContext *s)

  938. {

  939.     MXFContext *mxf = s->priv_data;

  940.     int i;

  941. 

  942.     av_freep(&mxf->packages_refs);

  943.     av_freep(&mxf->essence_container_data_sets_refs);

  944.     av_freep(&mxf->essence_containers_uls);

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

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

  947.         case MultipleDescriptor:

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

  949.             break;

  950.         case Sequence:

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

  952.             break;

  953.         case SourcePackage:

  954.         case MaterialPackage:

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

  956.             break;

  957.         default:

  958.             break;

  959.         }

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

  961.     }

  962.     av_freep(&mxf->metadata_sets);

  963.     return 0;

  964. }

  965. 

  966. static int mxf_probe(AVProbeData *p) {

  967.     uint8_t *bufp = p->buf;

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

  969. 

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

  971.         return 0;

  972. 

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

  974.     end -= sizeof(mxf_header_partition_pack_key);

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

  976.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  977.             return AVPROBE_SCORE_MAX;

  978.     }

  979.     return 0;

  980. }

  981. 

  982. /* rudimentary binary seek */

  983. /* XXX: use MXF Index */

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

  985. {

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

  987.     offset_t pos = url_ftell(&s->pb);

  988.     int64_t seconds;

  989.     int i;

  990. 

  991.     if (!s->bit_rate || sample_time < 0)

  992.         return -1;

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

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

  995.     /* sync on KLV essence element */

  996.     for (i = 0; i < 12 && url_ftell(&s->pb) < s->file_size; i++) {

  997.         int b = get_byte(&s->pb);

  998.         if (b == mxf_essence_element_key[0])

  999.             i = 0;

  1000.         else if (b != mxf_essence_element_key[i])

  1001.             i = -1;

  1002.     }

  1003.     if (i == 12) { /* found KLV key */

  1004.         url_fseek(&s->pb, -12, SEEK_CUR);

  1005.         av_update_cur_dts(s, st, sample_time);

  1006.         return 0;

  1007.     }

  1008.     url_fseek(&s->pb, pos, SEEK_SET);

  1009.     return -1;

  1010. }

  1011. 

  1012. AVInputFormat mxf_demuxer = {

  1013.     "mxf",

  1014.     "MXF format",

  1015.     sizeof(MXFContext),

  1016.     mxf_probe,

  1017.     mxf_read_header,

  1018.     mxf_read_packet,

  1019.     mxf_read_close,

  1020.     mxf_read_seek,

  1021. };