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FFmpeg/libavformat/mxf.c

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  1. /*

  2.  * MXF demuxer.

  3.  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

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

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

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "avformat.h"

  49. 

  50. typedef uint8_t UID[16];

  51. 

  52. enum MXFMetadataSetType {

  53.     AnyType,

  54.     MaterialPackage,

  55.     SourcePackage,

  56.     SourceClip,

  57.     TimecodeComponent,

  58.     Sequence,

  59.     MultipleDescriptor,

  60.     Descriptor,

  61.     Track,

  62.     EssenceContainerData,

  63. };

  64. 

  65. typedef struct MXFStructuralComponent {

  66.     UID uid;

  67.     enum MXFMetadataSetType type;

  68.     UID source_package_uid;

  69.     UID data_definition_ul;

  70.     int64_t duration;

  71.     int64_t start_position;

  72.     int source_track_id;

  73. } MXFStructuralComponent;

  74. 

  75. typedef struct MXFSequence {

  76.     UID uid;

  77.     enum MXFMetadataSetType type;

  78.     UID data_definition_ul;

  79.     UID *structural_components_refs;

  80.     int structural_components_count;

  81.     int64_t duration;

  82. } MXFSequence;

  83. 

  84. typedef struct MXFTrack {

  85.     UID uid;

  86.     enum MXFMetadataSetType type;

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

  88.     UID sequence_ref;

  89.     int track_id;

  90.     uint8_t track_number[4];

  91.     AVRational edit_rate;

  92. } MXFTrack;

  93. 

  94. typedef struct MXFDescriptor {

  95.     UID uid;

  96.     enum MXFMetadataSetType type;

  97.     UID essence_container_ul;

  98.     UID essence_codec_ul;

  99.     AVRational sample_rate;

  100.     AVRational aspect_ratio;

  101.     int width;

  102.     int height;

  103.     int channels;

  104.     int bits_per_sample;

  105.     UID *sub_descriptors_refs;

  106.     int sub_descriptors_count;

  107.     int linked_track_id;

  108.     uint8_t *extradata;

  109.     int extradata_size;

  110. } MXFDescriptor;

  111. 

  112. typedef struct MXFPackage {

  113.     UID uid;

  114.     enum MXFMetadataSetType type;

  115.     UID package_uid;

  116.     UID *tracks_refs;

  117.     int tracks_count;

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

  119.     UID descriptor_ref;

  120. } MXFPackage;

  121. 

  122. typedef struct MXFEssenceContainerData {

  123.     UID uid;

  124.     enum MXFMetadataSetType type;

  125.     UID linked_package_uid;

  126. } MXFEssenceContainerData;

  127. 

  128. typedef struct {

  129.     UID uid;

  130.     enum MXFMetadataSetType type;

  131. } MXFMetadataSet;

  132. 

  133. typedef struct MXFContext {

  134.     UID *packages_refs;

  135.     int packages_count;

  136.     MXFMetadataSet **metadata_sets;

  137.     int metadata_sets_count;

  138.     const uint8_t *sync_key;

  139.     AVFormatContext *fc;

  140. } MXFContext;

  141. 

  142. typedef struct KLVPacket {

  143.     UID key;

  144.     offset_t offset;

  145.     uint64_t length;

  146. } KLVPacket;

  147. 

  148. enum MXFWrappingScheme {

  149.     Frame,

  150.     Clip,

  151. };

  152. 

  153. typedef struct MXFCodecUL {

  154.     UID uid;

  155.     enum CodecID id;

  156.     enum MXFWrappingScheme wrapping;

  157. } MXFCodecUL;

  158. 

  159. typedef struct MXFDataDefinitionUL {

  160.     UID uid;

  161.     enum CodecType type;

  162. } MXFDataDefinitionUL;

  163. 

  164. typedef struct MXFMetadataReadTableEntry {

  165.     const UID key;

  166.     int (*read)();

  167.     int ctx_size;

  168.     enum MXFMetadataSetType type;

  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. /* complete keys to match */

  175. static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };

  176. 

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

  178. 

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

  180.                              (x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15])

  181. 

  182. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  183. {

  184.     uint64_t size = get_byte(pb);

  185.     if (size & 0x80) { /* long form */

  186.         int bytes_num = size & 0x7f;

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

  188.         if (bytes_num > 8)

  189.             return -1;

  190.         size = 0;

  191.         while (bytes_num--)

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

  193.     }

  194.     return size;

  195. }

  196. 

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

  198. {

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

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

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

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

  203. }

  204. 

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

  206. {

  207.     int i;

  208. 

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

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

  211.         /* SMPTE 379M 7.3 */

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

  213.             return i;

  214.     }

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

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

  217. }

  218. 

  219. /* XXX: use AVBitStreamFilter */

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

  221. {

  222.     uint8_t buffer[61444];

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

  224. 

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

  226.         return -1;

  227.     get_buffer(pb, buffer, length);

  228.     av_new_packet(pkt, length);

  229.     data_ptr = pkt->data;

  230.     end_ptr = buffer + length;

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

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

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

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

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

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

  237.             data_ptr += 3;

  238.         } else {

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

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

  241.             data_ptr += 2;

  242.         }

  243.     }

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

  245.     return 0;

  246. }

  247. 

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

  249. {

  250.     MXFContext *mxf = s->priv_data;

  251.     KLVPacket klv;

  252. 

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

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

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

  256.             return -1;

  257.         }

  258. #ifdef DEBUG

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

  260. #endif

  261.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  262.             mxf->sync_key = mxf_encrypted_triplet_key;

  263.             av_log(s, AV_LOG_ERROR, "encrypted triplet not supported\n");

  264.             return -1;

  265.         }

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

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

  268.             if (index < 0) {

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

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

  271.                 return -1;

  272.             }

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

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

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

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

  277.                     return -1;

  278.                 }

  279.             } else

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

  281.             pkt->stream_index = index;

  282.             return 0;

  283.         } else

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

  285.     }

  286.     return AVERROR_IO;

  287. }

  288. 

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

  290. {

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

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

  293.     mxf->metadata_sets_count++;

  294.     return 0;

  295. }

  296. 

  297. static int mxf_read_metadata_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)

  298. {

  299.     switch (tag) {

  300.     case 0x1901:

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

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

  303.             return -1;

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

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

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

  307.         break;

  308.     }

  309.     return 0;

  310. }

  311. 

  312. static int mxf_read_metadata_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)

  313. {

  314.     switch(tag) {

  315.     case 0x0202:

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

  317.         break;

  318.     case 0x1201:

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

  320.         break;

  321.     case 0x1101:

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

  323.         url_fskip(pb, 16);

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

  325.         break;

  326.     case 0x1102:

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

  328.         break;

  329.     }

  330.     return 0;

  331. }

  332. 

  333. static int mxf_read_metadata_material_package(MXFPackage *package, ByteIOContext *pb, int tag)

  334. {

  335.     switch(tag) {

  336.     case 0x4403:

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

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

  339.             return -1;

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

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

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

  343.         break;

  344.     }

  345.     return 0;

  346. }

  347. 

  348. static int mxf_read_metadata_track(MXFTrack *track, ByteIOContext *pb, int tag)

  349. {

  350.     switch(tag) {

  351.     case 0x4801:

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

  353.         break;

  354.     case 0x4804:

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

  356.         break;

  357.     case 0x4B01:

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

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

  360.         break;

  361.     case 0x4803:

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

  363.         break;

  364.     }

  365.     return 0;

  366. }

  367. 

  368. static int mxf_read_metadata_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)

  369. {

  370.     switch(tag) {

  371.     case 0x0202:

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

  373.         break;

  374.     case 0x0201:

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

  376.         break;

  377.     case 0x1001:

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

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

  380.             return -1;

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

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

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

  384.         break;

  385.     }

  386.     return 0;

  387. }

  388. 

  389. static int mxf_read_metadata_source_package(MXFPackage *package, ByteIOContext *pb, int tag)

  390. {

  391.     switch(tag) {

  392.     case 0x4403:

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

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

  395.             return -1;

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

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

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

  399.         break;

  400.     case 0x4401:

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

  402.         url_fskip(pb, 16);

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

  404.         break;

  405.     case 0x4701:

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

  407.         break;

  408.     }

  409.     return 0;

  410. }

  411. 

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

  413. {

  414.     int code;

  415. 

  416.     do {

  417.         code = get_byte(pb);

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

  419.         switch (code) {

  420.         case 0x52: /* R */

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

  422.             break;

  423.         case 0x47: /* G */

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

  425.             break;

  426.         case 0x42: /* B */

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

  428.             break;

  429.         default:

  430.             get_byte(pb);

  431.         }

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

  433. }

  434. 

  435. static int mxf_read_metadata_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size)

  436. {

  437.     switch(tag) {

  438.     case 0x3F01:

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

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

  441.             return -1;

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

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

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

  445.         break;

  446.     case 0x3004:

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

  448.         break;

  449.     case 0x3006:

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

  451.         break;

  452.     case 0x3201: /* PictureEssenceCoding */

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

  454.         break;

  455.     case 0x3203:

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

  457.         break;

  458.     case 0x3202:

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

  460.         break;

  461.     case 0x320E:

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

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

  464.         break;

  465.     case 0x3D03:

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

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

  468.         break;

  469.     case 0x3D06: /* SoundEssenceCompression */

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

  471.         break;

  472.     case 0x3D07:

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

  474.         break;

  475.     case 0x3D01:

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

  477.         break;

  478.     case 0x3401:

  479.         mxf_read_metadata_pixel_layout(pb, descriptor);

  480.         break;

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

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

  483.         descriptor->extradata_size = size;

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

  485.         break;

  486.     }

  487.     return 0;

  488. }

  489. 

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

  491. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

  492.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },

  493.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },

  494.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  495.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  496. };

  497. 

  498. static const MXFCodecUL mxf_codec_uls[] = {

  499.     /* PictureEssenceCoding */

  500.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  501.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */

  502.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  503.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  504.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  505.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  506.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  507.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  508.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  509.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  510.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  511.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  512.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  513.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  514.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  515.     /* SoundEssenceCompression */

  516.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  517.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  518.     { { 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 */

  519.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },

  520.     { { 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 */

  521.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  522.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  523.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  524.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  525. };

  526. 

  527. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  528.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  529.     { { 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 */

  530.     { { 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 */

  531.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  532. };

  533. 

  534. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  535.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  536.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  537.     { { 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 */

  538.     { { 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 */

  539.     { { 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 */

  540.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */

  541.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 50Mbps PAL Extended Template */

  542.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  543. };

  544. 

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

  546. {

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

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

  549.             break;

  550.         uls++;

  551.     }

  552.     return uls;

  553. }

  554. 

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

  556. {

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

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

  559.             break;

  560.         uls++;

  561.     }

  562.     return uls->type;

  563. }

  564. 

  565. static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)

  566. {

  567.     int i;

  568. 

  569.     if (!strong_ref)

  570.         return NULL;

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

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

  573.             (type == AnyType || mxf->metadata_sets[i]->type == type)) {

  574.             return mxf->metadata_sets[i];

  575.         }

  576.     }

  577.     return NULL;

  578. }

  579. 

  580. static int mxf_parse_structural_metadata(MXFContext *mxf)

  581. {

  582.     MXFPackage *material_package = NULL;

  583.     MXFPackage *temp_package = NULL;

  584.     int i, j, k;

  585. 

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

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

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

  589.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  590.         if (material_package) break;

  591.     }

  592.     if (!material_package) {

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

  594.         return -1;

  595.     }

  596. 

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

  598.         MXFPackage *source_package = NULL;

  599.         MXFTrack *material_track = NULL;

  600.         MXFTrack *source_track = NULL;

  601.         MXFTrack *temp_track = NULL;

  602.         MXFDescriptor *descriptor = NULL;

  603.         MXFStructuralComponent *component = NULL;

  604.         const MXFCodecUL *codec_ul = NULL;

  605.         const MXFCodecUL *container_ul = NULL;

  606.         AVStream *st;

  607. 

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

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

  610.             continue;

  611.         }

  612. 

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

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

  615.             return -1;

  616.         }

  617. 

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

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

  620.             /* TODO: handle timecode component */

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

  622.             if (!component)

  623.                 continue;

  624. 

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

  626.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  627.                 if (!temp_package)

  628.                     continue;

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

  630.                     source_package = temp_package;

  631.                     break;

  632.                 }

  633.             }

  634.             if (!source_package) {

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

  636.                 break;

  637.             }

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

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

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

  641.                     return -1;

  642.                 }

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

  644.                     source_track = temp_track;

  645.                     break;

  646.                 }

  647.             }

  648.             if (!source_track) {

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

  650.                 break;

  651.             }

  652.         }

  653.         if (!source_track)

  654.             continue;

  655. 

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

  657.         st->priv_data = source_track;

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

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

  660.             st->duration = AV_NOPTS_VALUE;

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

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

  663. 

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

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

  666.             return -1;

  667.         }

  668. 

  669. #ifdef DEBUG

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

  671. #endif

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

  673. 

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

  675.         if (source_package->descriptor) {

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

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

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

  679. 

  680.                     if (!sub_descriptor) {

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

  682.                         continue;

  683.                     }

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

  685.                         descriptor = sub_descriptor;

  686.                         break;

  687.                     }

  688.                 }

  689.             } else if (source_package->descriptor->type == Descriptor)

  690.                 descriptor = source_package->descriptor;

  691.         }

  692.         if (!descriptor) {

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

  694.             continue;

  695.         }

  696. #ifdef DEBUG

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

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

  699. #endif

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

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

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

  703.         if (descriptor->extradata) {

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

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

  706.         }

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

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

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

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

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

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

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

  714.             st->need_parsing = 2; /* only parse headers */

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

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

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

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

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

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

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

  722.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

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

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

  736.                 st->need_parsing = 1;

  737.             }

  738.         }

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

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

  741.             st->need_parsing = 1;

  742.         }

  743.     }

  744.     return 0;

  745. }

  746. 

  747. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  748.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage, 0, AnyType },

  749.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package, sizeof(MXFPackage), SourcePackage },

  750.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package, sizeof(MXFPackage), MaterialPackage },

  751.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence, sizeof(MXFSequence), Sequence },

  752.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  753.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  754.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */

  755.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  756.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  757.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */

  758.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  759.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  760.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Static Track */

  761.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Generic Track */

  762.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  763. };

  764. 

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

  766. {

  767.     int i, b;

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

  769.         b = get_byte(pb);

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

  771.             i = 0;

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

  773.             i = -1;

  774.     }

  775.     return i == size;

  776. }

  777. 

  778. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)

  779. {

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

  781.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  782.     uint64_t klv_end= url_ftell(pb) + klv->length;

  783. 

  784.     while (url_ftell(pb) + 4 < klv_end) {

  785.         int tag = get_be16(pb);

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

  787.         uint64_t next= url_ftell(pb) + size;

  788. 

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

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

  791.             continue;

  792.         }

  793.         if(ctx_size && tag == 0x3C0A)

  794.             get_buffer(pb, ctx->uid, 16);

  795.         else

  796.             read_child(ctx, pb, tag, size);

  797. 

  798.         url_fseek(pb, next, SEEK_SET);

  799.     }

  800.     if (ctx_size) ctx->type = type;

  801.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  802. }

  803. 

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

  805. {

  806.     MXFContext *mxf = s->priv_data;

  807.     KLVPacket klv;

  808. 

  809.     mxf->sync_key = mxf_essence_element_key;

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

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

  812.         return -1;

  813.     }

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

  815.     mxf->fc = s;

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

  817.         const MXFMetadataReadTableEntry *metadata;

  818. 

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

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

  821.             return -1;

  822.         }

  823. #ifdef DEBUG

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

  825. #endif

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

  827.             /* FIXME avoid seek */

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

  829.             break;

  830.         }

  831. 

  832.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  833.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  834.                 if (mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {

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

  836.                     return -1;

  837.                 }

  838.                 break;

  839.             }

  840.         }

  841.         if (!metadata->read)

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

  843.     }

  844.     return mxf_parse_structural_metadata(mxf);

  845. }

  846. 

  847. static int mxf_read_close(AVFormatContext *s)

  848. {

  849.     MXFContext *mxf = s->priv_data;

  850.     int i;

  851. 

  852.     av_freep(&mxf->packages_refs);

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

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

  855.         case MultipleDescriptor:

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

  857.             break;

  858.         case Sequence:

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

  860.             break;

  861.         case SourcePackage:

  862.         case MaterialPackage:

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

  864.             break;

  865.         default:

  866.             break;

  867.         }

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

  869.     }

  870.     av_freep(&mxf->metadata_sets);

  871.     return 0;

  872. }

  873. 

  874. static int mxf_probe(AVProbeData *p) {

  875.     uint8_t *bufp = p->buf;

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

  877. 

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

  879.         return 0;

  880. 

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

  882.     end -= sizeof(mxf_header_partition_pack_key);

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

  884.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  885.             return AVPROBE_SCORE_MAX;

  886.     }

  887.     return 0;

  888. }

  889. 

  890. /* rudimentary binary seek */

  891. /* XXX: use MXF Index */

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

  893. {

  894.     MXFContext *mxf = s->priv_data;

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

  896.     int64_t seconds;

  897. 

  898.     if (!s->bit_rate)

  899.         return -1;

  900.     if (sample_time < 0)

  901.         sample_time = 0;

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

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

  904.     if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))

  905.         return -1;

  906. 

  907.     /* found KLV key */

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

  909.     av_update_cur_dts(s, st, sample_time);

  910.     return 0;

  911. }

  912. 

  913. AVInputFormat mxf_demuxer = {

  914.     "mxf",

  915.     "MXF format",

  916.     sizeof(MXFContext),

  917.     mxf_probe,

  918.     mxf_read_header,

  919.     mxf_read_packet,

  920.     mxf_read_close,

  921.     mxf_read_seek,

  922. };