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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 -1;

  218. }

  219. 

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

  221. {

  222.     KLVPacket klv;

  223. 

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

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

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

  227.             return -1;

  228.         }

  229. #ifdef DEBUG

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

  231. #endif

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

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

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

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

  236.         } else

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

  238.     }

  239.     return AVERROR_IO;

  240. }

  241. 

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

  243. {

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

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

  246.     mxf->metadata_sets_count++;

  247.     return 0;

  248. }

  249. 

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

  251. {

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

  253.     int bytes_read = 0;

  254. 

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

  256.         int tag = get_be16(pb);

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

  258. 

  259.         switch (tag) {

  260.         case 0x3B03:

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

  262.             break;

  263.         case 0x3B09:

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

  265.             break;

  266.         case 0x3B0A:

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

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

  269.                 return -1;

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

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

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

  273.             break;

  274.         default:

  275.             url_fskip(pb, size);

  276.         }

  277.         bytes_read += size + 4;

  278.     }

  279.     return 0;

  280. }

  281. 

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

  283. {

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

  285.     int bytes_read = 0;

  286. 

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

  288.         int tag = get_be16(pb);

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

  290. 

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

  292.         switch (tag) {

  293.         case 0x1901:

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

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

  296.                 return -1;

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

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

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

  300.             break;

  301.         case 0x1902:

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

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

  304.                 return -1;

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

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

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

  308.             break;

  309.         default:

  310.             url_fskip(pb, size);

  311.         }

  312.         bytes_read += size + 4;

  313.     }

  314.     return 0;

  315. }

  316. 

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

  318. {

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

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

  321.     int bytes_read = 0;

  322. 

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

  324.         int tag = get_be16(pb);

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

  326. 

  327.         bytes_read += size + 4;

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

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

  330.             continue;

  331.         switch (tag) {

  332.         case 0x3C0A:

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

  334.             break;

  335.         case 0x0202:

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

  337.             break;

  338.         case 0x1201:

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

  340.             break;

  341.         case 0x1101:

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

  343.             url_fskip(pb, 16);

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

  345.             break;

  346.         case 0x1102:

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

  348.             break;

  349.         default:

  350.             url_fskip(pb, size);

  351.         }

  352.     }

  353.     source_clip->type = SourceClip;

  354.     return mxf_add_metadata_set(mxf, source_clip);

  355. }

  356. 

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

  358. {

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

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

  361.     int bytes_read = 0;

  362. 

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

  364.         int tag = get_be16(pb);

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

  366. 

  367.         switch (tag) {

  368.         case 0x3C0A:

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

  370.             break;

  371.         case 0x4403:

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

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

  374.                 return -1;

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

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

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

  378.             break;

  379.         default:

  380.             url_fskip(pb, size);

  381.         }

  382.         bytes_read += size + 4;

  383.     }

  384.     package->type = MaterialPackage;

  385.     return mxf_add_metadata_set(mxf, package);

  386. }

  387. 

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

  389. {

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

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

  392.     int bytes_read = 0;

  393. 

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

  395.         int tag = get_be16(pb);

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

  397. 

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

  399.         switch (tag) {

  400.         case 0x3C0A:

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

  402.             break;

  403.         case 0x4801:

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

  405.             break;

  406.         case 0x4804:

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

  408.             break;

  409.         case 0x4B01:

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

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

  412.             break;

  413.         case 0x4803:

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

  415.             break;

  416.         default:

  417.             url_fskip(pb, size);

  418.         }

  419.         bytes_read += size + 4;

  420.     }

  421.     track->type = Track;

  422.     return mxf_add_metadata_set(mxf, track);

  423. }

  424. 

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

  426. {

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

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

  429.     int bytes_read = 0;

  430. 

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

  432.         int tag = get_be16(pb);

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

  434. 

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

  436.         switch (tag) {

  437.         case 0x3C0A:

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

  439.             break;

  440.         case 0x0202:

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

  442.             break;

  443.         case 0x0201:

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

  445.             break;

  446.         case 0x1001:

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

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

  449.                 return -1;

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

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

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

  453.             break;

  454.         default:

  455.             url_fskip(pb, size);

  456.         }

  457.         bytes_read += size + 4;

  458.     }

  459.     sequence->type = Sequence;

  460.     return mxf_add_metadata_set(mxf, sequence);

  461. }

  462. 

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

  464. {

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

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

  467.     int bytes_read = 0;

  468. 

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

  470.         int tag = get_be16(pb);

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

  472. 

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

  474.         switch (tag) {

  475.         case 0x3C0A:

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

  477.             break;

  478.         case 0x4403:

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

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

  481.                 return -1;

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

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

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

  485.             break;

  486.         case 0x4401:

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

  488.             url_fskip(pb, 16);

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

  490.             break;

  491.         case 0x4701:

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

  493.             break;

  494.         default:

  495.             url_fskip(pb, size);

  496.         }

  497.         bytes_read += size + 4;

  498.     }

  499.     package->type = SourcePackage;

  500.     return mxf_add_metadata_set(mxf, package);

  501. }

  502. 

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

  504. {

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

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

  507.     int bytes_read = 0;

  508. 

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

  510.         int tag = get_be16(pb);

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

  512. 

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

  514.         switch (tag) {

  515.         case 0x3C0A:

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

  517.             break;

  518.         case 0x3F01:

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

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

  521.                 return -1;

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

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

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

  525.             break;

  526.         default:

  527.             url_fskip(pb, size);

  528.         }

  529.         bytes_read += size + 4;

  530.     }

  531.     descriptor->type = MultipleDescriptor;

  532.     return mxf_add_metadata_set(mxf, descriptor);

  533. }

  534. 

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

  536. {

  537.     int code;

  538. 

  539.     do {

  540.         code = get_byte(pb);

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

  542.         switch (code) {

  543.         case 0x52: /* R */

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

  545.             break;

  546.         case 0x47: /* G */

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

  548.             break;

  549.         case 0x42: /* B */

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

  551.             break;

  552.         default:

  553.             get_byte(pb);

  554.         }

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

  556. }

  557. 

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

  559. {

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

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

  562.     int bytes_read = 0;

  563. 

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

  565.         int tag = get_be16(pb);

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

  567. 

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

  569.         switch (tag) {

  570.         case 0x3C0A:

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

  572.             break;

  573.         case 0x3004:

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

  575.             break;

  576.         case 0x3006:

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

  578.             break;

  579.         case 0x3201: /* PictureEssenceCoding */

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

  581.             break;

  582.         case 0x3203:

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

  584.             break;

  585.         case 0x3202:

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

  587.             break;

  588.         case 0x320E:

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

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

  591.             break;

  592.         case 0x3D03:

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

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

  595.             break;

  596.         case 0x3D06: /* SoundEssenceCompression */

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

  598.             break;

  599.         case 0x3D07:

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

  601.             break;

  602.         case 0x3D01:

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

  604.             break;

  605.         case 0x3401:

  606.             mxf_read_metadata_pixel_layout(pb, descriptor);

  607.             break;

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

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

  610.             descriptor->extradata_size = size;

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

  612.             break;

  613.         default:

  614.             url_fskip(pb, size);

  615.         }

  616.         bytes_read += size + 4;

  617.     }

  618.     descriptor->type = Descriptor;

  619.     return mxf_add_metadata_set(mxf, descriptor);

  620. }

  621. 

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

  623. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

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

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

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

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

  628. };

  629. 

  630. static const MXFCodecUL mxf_codec_uls[] = {

  631.     /* PictureEssenceCoding */

  632.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  633.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  634.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  635.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

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

  637.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  638.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  639.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  640.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  641.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  642.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  643.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  644.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  645.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  646.     /* SoundEssenceCompression */

  647.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  648.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  649.     { { 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 */

  650.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },

  651.     { { 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 */

  652.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  653.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  654.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  655.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  656. };

  657. 

  658. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  659.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  660.     { { 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 */

  661.     { { 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 */

  662.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  663. };

  664. 

  665. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  666.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

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

  668.     { { 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 */

  669.     { { 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 */

  670.     { { 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 */

  671.   //{ { 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 */

  672.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  673. };

  674. 

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

  676. {

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

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

  679.             break;

  680.         uls++;

  681.     }

  682.     return uls;

  683. }

  684. 

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

  686. {

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

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

  689.             break;

  690.         uls++;

  691.     }

  692.     return uls->type;

  693. }

  694. 

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

  696. {

  697.     int i;

  698. 

  699.     if (!strong_ref)

  700.         return NULL;

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

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

  703.             return mxf->metadata_sets[i];

  704.         }

  705.     }

  706.     return NULL;

  707. }

  708. 

  709. static int mxf_parse_structural_metadata(MXFContext *mxf)

  710. {

  711.     MXFPackage *material_package = NULL;

  712.     MXFPackage *source_package = NULL;

  713.     MXFPackage *temp_package = NULL;

  714.     int i, j, k;

  715. 

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

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

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

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

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

  721.             return -1;

  722.         }

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

  724.             material_package = temp_package;

  725.             break;

  726.         }

  727.     }

  728.     if (!material_package) {

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

  730.         return -1;

  731.     }

  732. 

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

  734.         MXFTrack *material_track = NULL;

  735.         MXFTrack *source_track = NULL;

  736.         MXFTrack *temp_track = NULL;

  737.         MXFDescriptor *descriptor = NULL;

  738.         MXFStructuralComponent *component = NULL;

  739.         const MXFCodecUL *codec_ul = NULL;

  740.         const MXFCodecUL *container_ul = NULL;

  741.         AVStream *st;

  742. 

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

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

  745.             continue;

  746.         }

  747. 

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

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

  750.             return -1;

  751.         }

  752. 

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

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

  755.             /* TODO: handle timecode component */

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

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

  758.                 continue;

  759. 

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

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

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

  763.                     return -1;

  764.                 }

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

  766.                     source_package = temp_package;

  767.                     break;

  768.                 }

  769.             }

  770.             if (!source_package) {

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

  772.                 break;

  773.             }

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

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

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

  777.                     return -1;

  778.                 }

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

  780.                     source_track = temp_track;

  781.                     break;

  782.                 }

  783.             }

  784.             if (!source_track) {

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

  786.                 break;

  787.             }

  788.         }

  789.         if (!source_track)

  790.             continue;

  791. 

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

  793.         st->priv_data = source_track;

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

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

  796.             st->duration = AV_NOPTS_VALUE;

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

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

  799. 

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

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

  802.             return -1;

  803.         }

  804. 

  805. #ifdef DEBUG

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

  807. #endif

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

  809. 

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

  811.         if (source_package->descriptor) {

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

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

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

  815. 

  816.                     if (!sub_descriptor) {

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

  818.                         continue;

  819.                     }

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

  821.                         descriptor = sub_descriptor;

  822.                         break;

  823.                     }

  824.                 }

  825.             } else

  826.                 descriptor = source_package->descriptor;

  827.         }

  828.         if (!descriptor) {

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

  830.             continue;

  831.         }

  832. #ifdef DEBUG

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

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

  835. #endif

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

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

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

  839.         if (descriptor->extradata) {

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

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

  842.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  857.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

  868.             }

  869.         }

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

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

  872.             st->need_parsing = 1;

  873.         }

  874.     }

  875.     return 0;

  876. }

  877. 

  878. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  879.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },

  880.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },

  881.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },

  882.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },

  883.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },

  884.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },

  885.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },

  886.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */

  887.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */

  888.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */

  889.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */

  890.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */

  891.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */

  892.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */

  893.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */

  894.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },

  895. };

  896. 

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

  898. {

  899.     MXFContext *mxf = s->priv_data;

  900.     KLVPacket klv;

  901. 

  902.     mxf->fc = s;

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

  904.         const MXFMetadataReadTableEntry *function;

  905. 

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

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

  908.             return -1;

  909.         }

  910. #ifdef DEBUG

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

  912. #endif

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

  914.             /* FIXME avoid seek */

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

  916.             break;

  917.         }

  918. 

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

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

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

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

  923.                     return -1;

  924.                 }

  925.                 break;

  926.             }

  927.         }

  928.         if (!function->read)

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

  930.     }

  931.     return mxf_parse_structural_metadata(mxf);

  932. }

  933. 

  934. static int mxf_read_close(AVFormatContext *s)

  935. {

  936.     MXFContext *mxf = s->priv_data;

  937.     int i;

  938. 

  939.     av_freep(&mxf->packages_refs);

  940.     av_freep(&mxf->essence_container_data_sets_refs);

  941.     av_freep(&mxf->essence_containers_uls);

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

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

  944.         case MultipleDescriptor:

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

  946.             break;

  947.         case Sequence:

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

  949.             break;

  950.         case SourcePackage:

  951.         case MaterialPackage:

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

  953.             break;

  954.         default:

  955.             break;

  956.         }

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

  958.     }

  959.     av_freep(&mxf->metadata_sets);

  960.     return 0;

  961. }

  962. 

  963. static int mxf_probe(AVProbeData *p) {

  964.     uint8_t *bufp = p->buf;

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

  966. 

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

  968.         return 0;

  969. 

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

  971.     end -= sizeof(mxf_header_partition_pack_key);

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

  973.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  974.             return AVPROBE_SCORE_MAX;

  975.     }

  976.     return 0;

  977. }

  978. 

  979. /* rudimentary binary seek */

  980. /* XXX: use MXF Index */

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

  982. {

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

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

  985.     int64_t seconds;

  986.     int i;

  987. 

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

  989.         return -1;

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

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

  992.     /* sync on KLV essence element */

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

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

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

  996.             i = 0;

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

  998.             i = -1;

  999.     }

  1000.     if (i == 12) { /* found KLV key */

  1001.         url_fseek(&s->pb, -12, SEEK_CUR);

  1002.         av_update_cur_dts(s, st, sample_time);

  1003.         return 0;

  1004.     }

  1005.     url_fseek(&s->pb, pos, SEEK_SET);

  1006.     return -1;

  1007. }

  1008. 

  1009. AVInputFormat mxf_demuxer = {

  1010.     "mxf",

  1011.     "MXF format",

  1012.     sizeof(MXFContext),

  1013.     mxf_probe,

  1014.     mxf_read_header,

  1015.     mxf_read_packet,

  1016.     mxf_read_close,

  1017.     mxf_read_seek,

  1018. };