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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 MXFMetadataReadTableEntry {

  162.     const UID key;

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

  164. } MXFMetadataReadTableEntry;

  165. 

  166. /* partial keys to match */

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

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

  169. 

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

  171. 

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

  173.                              (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])

  174. 

  175. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  176. {

  177.     int64_t size = 0;

  178.     uint8_t length = get_byte(pb);

  179.     int type = length >> 7;

  180. 

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

  182.         int bytes_num = length & 0x7f;

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

  184.         if (bytes_num > 8)

  185.             return -1;

  186.         while (bytes_num--)

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

  188.     } else {

  189.         size = length & 0x7f;

  190.     }

  191.     return size;

  192. }

  193. 

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

  195. {

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

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

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

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

  200. }

  201. 

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

  203. {

  204.     int i;

  205. 

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

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

  208.          /* SMPTE 379M 7.3 */

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

  210.             return i;

  211.     }

  212.     return -1;

  213. }

  214. 

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

  216. {

  217.     KLVPacket klv;

  218. 

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

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

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

  222.             return -1;

  223.         }

  224. #ifdef DEBUG

  225.         PRINT_KEY(klv.key);

  226. #endif

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

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

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

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

  231.         } else

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

  233.     }

  234.     return AVERROR_IO;

  235. }

  236. 

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

  238. {

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

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

  241.     mxf->metadata_sets_count++;

  242.     return 0;

  243. }

  244. 

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

  246. {

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

  248.     int bytes_read = 0;

  249. 

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

  251.         int tag = get_be16(pb);

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

  253. 

  254.         switch (tag) {

  255.         case 0x3B03:

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

  257.             break;

  258.         case 0x3B09:

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

  260.             break;

  261.         case 0x3B0A:

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

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

  264.                 return -1;

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

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

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

  268.             break;

  269.         default:

  270.             url_fskip(pb, size);

  271.         }

  272.         bytes_read += size + 4;

  273.     }

  274.     return 0;

  275. }

  276. 

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

  278. {

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

  280.     int bytes_read = 0;

  281. 

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

  283.         int tag = get_be16(pb);

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

  285. 

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

  287.         switch (tag) {

  288.         case 0x1901:

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

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

  291.                 return -1;

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

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

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

  295.             break;

  296.         case 0x1902:

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

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

  299.                 return -1;

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

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

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

  303.             break;

  304.         default:

  305.             url_fskip(pb, size);

  306.         }

  307.         bytes_read += size + 4;

  308.     }

  309.     return 0;

  310. }

  311. 

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

  313. {

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

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

  316.     int bytes_read = 0;

  317. 

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

  319.         int tag = get_be16(pb);

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

  321. 

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

  323.         switch (tag) {

  324.         case 0x3C0A:

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

  326.             break;

  327.         case 0x0202:

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

  329.             break;

  330.         case 0x1201:

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

  332.             break;

  333.         case 0x1101:

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

  335.             url_fskip(pb, 16);

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

  337.             break;

  338.         case 0x1102:

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

  340.             break;

  341.         default:

  342.             url_fskip(pb, size);

  343.         }

  344.         bytes_read += size + 4;

  345.     }

  346.     source_clip->type = SourceClip;

  347.     return mxf_add_metadata_set(mxf, source_clip);

  348. }

  349. 

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

  351. {

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

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

  354.     int bytes_read = 0;

  355. 

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

  357.         int tag = get_be16(pb);

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

  359. 

  360.         switch (tag) {

  361.         case 0x3C0A:

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

  363.             break;

  364.         case 0x4403:

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

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

  367.                 return -1;

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

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

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

  371.             break;

  372.         default:

  373.             url_fskip(pb, size);

  374.         }

  375.         bytes_read += size + 4;

  376.     }

  377.     package->type = MaterialPackage;

  378.     return mxf_add_metadata_set(mxf, package);

  379. }

  380. 

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

  382. {

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

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

  385.     int bytes_read = 0;

  386. 

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

  388.         int tag = get_be16(pb);

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

  390. 

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

  392.         switch (tag) {

  393.         case 0x3C0A:

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

  395.             break;

  396.         case 0x4801:

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

  398.             break;

  399.         case 0x4804:

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

  401.             break;

  402.         case 0x4B01:

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

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

  405.             break;

  406.         case 0x4803:

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

  408.             break;

  409.         default:

  410.             url_fskip(pb, size);

  411.         }

  412.         bytes_read += size + 4;

  413.     }

  414.     track->type = Track;

  415.     return mxf_add_metadata_set(mxf, track);

  416. }

  417. 

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

  419. {

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

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

  422.     int bytes_read = 0;

  423. 

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

  425.         int tag = get_be16(pb);

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

  427. 

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

  429.         switch (tag) {

  430.         case 0x3C0A:

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

  432.             break;

  433.         case 0x0202:

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

  435.             break;

  436.         case 0x0201:

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

  438.             break;

  439.         case 0x1001:

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

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

  442.                 return -1;

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

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

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

  446.             break;

  447.         default:

  448.             url_fskip(pb, size);

  449.         }

  450.         bytes_read += size + 4;

  451.     }

  452.     sequence->type = Sequence;

  453.     return mxf_add_metadata_set(mxf, sequence);

  454. }

  455. 

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

  457. {

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

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

  460.     int bytes_read = 0;

  461. 

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

  463.         int tag = get_be16(pb);

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

  465. 

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

  467.         switch (tag) {

  468.         case 0x3C0A:

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

  470.             break;

  471.         case 0x4403:

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

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

  474.                 return -1;

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

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

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

  478.             break;

  479.         case 0x4401:

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

  481.             url_fskip(pb, 16);

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

  483.             break;

  484.         case 0x4701:

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

  486.             break;

  487.         default:

  488.             url_fskip(pb, size);

  489.         }

  490.         bytes_read += size + 4;

  491.     }

  492.     package->type = SourcePackage;

  493.     return mxf_add_metadata_set(mxf, package);

  494. }

  495. 

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

  497. {

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

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

  500.     int bytes_read = 0;

  501. 

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

  503.         int tag = get_be16(pb);

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

  505. 

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

  507.         switch (tag) {

  508.         case 0x3C0A:

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

  510.             break;

  511.         case 0x3F01:

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

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

  514.                 return -1;

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

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

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

  518.             break;

  519.         default:

  520.             url_fskip(pb, size);

  521.         }

  522.         bytes_read += size + 4;

  523.     }

  524.     descriptor->type = MultipleDescriptor;

  525.     return mxf_add_metadata_set(mxf, descriptor);

  526. }

  527. 

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

  529. {

  530.     int code;

  531. 

  532.     do {

  533.         code = get_byte(pb);

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

  535.         switch (code) {

  536.         case 0x52: /* R */

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

  538.             break;

  539.         case 0x47: /* G */

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

  541.             break;

  542.         case 0x42: /* B */

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

  544.             break;

  545.         default:

  546.             get_byte(pb);

  547.         }

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

  549. }

  550. 

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

  552. {

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

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

  555.     int bytes_read = 0;

  556. 

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

  558.         int tag = get_be16(pb);

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

  560. 

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

  562.         switch (tag) {

  563.         case 0x3C0A:

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

  565.             break;

  566.         case 0x3004:

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

  568.             break;

  569.         case 0x3006:

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

  571.             break;

  572.         case 0x3201: /* PictureEssenceCoding */

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

  574.             break;

  575.         case 0x3203:

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

  577.             break;

  578.         case 0x3202:

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

  580.             break;

  581.         case 0x320E:

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

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

  584.             break;

  585.         case 0x3D03:

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

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

  588.             break;

  589.         case 0x3D06: /* SoundEssenceCompression */

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

  591.             break;

  592.         case 0x3D07:

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

  594.             break;

  595.         case 0x3D01:

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

  597.             break;

  598.         case 0x3401:

  599.             mxf_read_metadata_pixel_layout(pb, descriptor);

  600.             break;

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

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

  603.             descriptor->extradata_size = size;

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

  605.             break;

  606.         default:

  607.             url_fskip(pb, size);

  608.         }

  609.         bytes_read += size + 4;

  610.     }

  611.     descriptor->type = Descriptor;

  612.     return mxf_add_metadata_set(mxf, descriptor);

  613. }

  614. 

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

  616. static const UID picture_essence_track_ul = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 };

  617. static const UID sound_essence_track_ul   = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 };

  618. 

  619. static const MXFCodecUL mxf_codec_uls[] = {

  620.     /* PictureEssenceCoding */

  621.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  622.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  623.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  624.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  625.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  626.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  627.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  628.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  629.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  630.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  631.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  632.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  633.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  634.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  635.     /* SoundEssenceCompression */

  636.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  637.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  638.     { { 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 */

  639.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },

  640.     { { 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 */

  641.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  642.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  643.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  644.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  645. };

  646. 

  647. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  648.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  649.     { { 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 */

  650.     { { 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 */

  651.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  652. };

  653. 

  654. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  655.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  656.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  657.     { { 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 */

  658.     { { 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 */

  659.     { { 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 */

  660.   //{ { 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 */

  661.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  662. };

  663. 

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

  665. {

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

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

  668.             break;

  669.         uls++;

  670.     }

  671.     return uls;

  672. }

  673. 

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

  675. {

  676.     int i;

  677. 

  678.     if (!strong_ref)

  679.         return NULL;

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

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

  682.             return mxf->metadata_sets[i];

  683.         }

  684.     }

  685.     return NULL;

  686. }

  687. 

  688. static int mxf_parse_structural_metadata(MXFContext *mxf)

  689. {

  690.     MXFPackage *material_package = NULL;

  691.     MXFPackage *source_package = NULL;

  692.     MXFPackage *temp_package = NULL;

  693.     int i, j, k;

  694. 

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

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

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

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

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

  700.             return -1;

  701.         }

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

  703.             material_package = temp_package;

  704.             break;

  705.         }

  706.     }

  707.     if (!material_package) {

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

  709.         return -1;

  710.     }

  711. 

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

  713.         MXFTrack *material_track = NULL;

  714.         MXFTrack *source_track = NULL;

  715.         MXFTrack *temp_track = NULL;

  716.         MXFDescriptor *descriptor = NULL;

  717.         MXFStructuralComponent *component = NULL;

  718.         const MXFCodecUL *codec_ul = NULL;

  719.         const MXFCodecUL *container_ul = NULL;

  720.         AVStream *st;

  721. 

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

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

  724.             continue;

  725.         }

  726. 

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

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

  729.             return -1;

  730.         }

  731. 

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

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

  734.             /* TODO: handle timecode component */

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

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

  737.                 continue;

  738. 

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

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

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

  742.                     return -1;

  743.                 }

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

  745.                     source_package = temp_package;

  746.                     break;

  747.                 }

  748.             }

  749.             if (!source_package) {

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

  751.                 break;

  752.             }

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

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

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

  756.                     return -1;

  757.                 }

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

  759.                     source_track = temp_track;

  760.                     break;

  761.                 }

  762.             }

  763.             if (!source_track) {

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

  765.                 break;

  766.             }

  767.         }

  768.         if (!source_track)

  769.             continue;

  770. 

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

  772.         st->priv_data = source_track;

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

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

  775.             st->duration = AV_NOPTS_VALUE;

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

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

  778. 

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

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

  781.             return -1;

  782.         }

  783. 

  784. #ifdef DEBUG

  785.         PRINT_KEY(source_track->sequence->data_definition_ul);

  786. #endif

  787.         if (!memcmp(source_track->sequence->data_definition_ul, picture_essence_track_ul, 16))

  788.             st->codec->codec_type = CODEC_TYPE_VIDEO;

  789.         else if (!memcmp(source_track->sequence->data_definition_ul, sound_essence_track_ul, 16))

  790.             st->codec->codec_type = CODEC_TYPE_AUDIO;

  791.         else

  792.             st->codec->codec_type = CODEC_TYPE_DATA;

  793. 

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

  795.         if (source_package->descriptor) {

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

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

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

  799. 

  800.                     if (!sub_descriptor) {

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

  802.                         continue;

  803.                     }

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

  805.                         descriptor = sub_descriptor;

  806.                         break;

  807.                     }

  808.                 }

  809.             } else

  810.                 descriptor = source_package->descriptor;

  811.         }

  812.         if (!descriptor) {

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

  814.             continue;

  815.         }

  816. #ifdef DEBUG

  817.         PRINT_KEY(descriptor->essence_codec_ul);

  818.         PRINT_KEY(descriptor->essence_container_ul);

  819. #endif

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

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

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

  823.         if (descriptor->extradata) {

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

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

  826.         }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  841.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

  852.             }

  853.         }

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

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

  856.             st->need_parsing = 1;

  857.         }

  858.     }

  859.     return 0;

  860. }

  861. 

  862. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  863.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },

  864.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },

  865.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },

  866.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },

  867.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },

  868.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },

  869.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },

  870.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */

  871.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */

  872.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */

  873.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */

  874.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */

  875.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */

  876.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */

  877.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */

  878.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },

  879. };

  880. 

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

  882. {

  883.     MXFContext *mxf = s->priv_data;

  884.     KLVPacket klv;

  885. 

  886.     mxf->fc = s;

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

  888.         const MXFMetadataReadTableEntry *function;

  889. 

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

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

  892.             return -1;

  893.         }

  894. #ifdef DEBUG

  895.         PRINT_KEY(klv.key);

  896. #endif

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

  898.             /* FIXME avoid seek */

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

  900.             break;

  901.         }

  902. 

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

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

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

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

  907.                     return -1;

  908.                 }

  909.                 break;

  910.             }

  911.         }

  912.         if (!function->read)

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

  914.     }

  915.     return mxf_parse_structural_metadata(mxf);

  916. }

  917. 

  918. static int mxf_read_close(AVFormatContext *s)

  919. {

  920.     MXFContext *mxf = s->priv_data;

  921.     int i;

  922. 

  923.     av_freep(&mxf->packages_refs);

  924.     av_freep(&mxf->essence_container_data_sets_refs);

  925.     av_freep(&mxf->essence_containers_uls);

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

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

  928.         case MultipleDescriptor:

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

  930.             break;

  931.         case Sequence:

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

  933.             break;

  934.         case SourcePackage:

  935.         case MaterialPackage:

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

  937.             break;

  938.         default:

  939.             break;

  940.         }

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

  942.     }

  943.     av_freep(&mxf->metadata_sets);

  944.     return 0;

  945. }

  946. 

  947. static int mxf_probe(AVProbeData *p) {

  948.     uint8_t *bufp = p->buf;

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

  950. 

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

  952.         return 0;

  953. 

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

  955.     end -= sizeof(mxf_header_partition_pack_key);

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

  957.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  958.             return AVPROBE_SCORE_MAX;

  959.     }

  960.     return 0;

  961. }

  962. 

  963. 

  964. AVInputFormat mxf_demuxer = {

  965.     "mxf",

  966.     "MXF format",

  967.     sizeof(MXFContext),

  968.     mxf_probe,

  969.     mxf_read_header,

  970.     mxf_read_packet,

  971.     mxf_read_close,

  972.     NULL,

  973. };