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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. #include "aes.h"

  50. 

  51. typedef uint8_t UID[16];

  52. 

  53. enum MXFMetadataSetType {

  54.     AnyType,

  55.     MaterialPackage,

  56.     SourcePackage,

  57.     SourceClip,

  58.     TimecodeComponent,

  59.     Sequence,

  60.     MultipleDescriptor,

  61.     Descriptor,

  62.     Track,

  63.     EssenceContainerData,

  64.     CryptoContext,

  65. };

  66. 

  67. typedef struct MXFCryptoContext {

  68.     UID uid;

  69.     enum MXFMetadataSetType type;

  70.     UID context_uid;

  71.     UID source_container_ul;

  72. } MXFCryptoContext;

  73. 

  74. typedef struct MXFStructuralComponent {

  75.     UID uid;

  76.     enum MXFMetadataSetType type;

  77.     UID source_package_uid;

  78.     UID data_definition_ul;

  79.     int64_t duration;

  80.     int64_t start_position;

  81.     int source_track_id;

  82. } MXFStructuralComponent;

  83. 

  84. typedef struct MXFSequence {

  85.     UID uid;

  86.     enum MXFMetadataSetType type;

  87.     UID data_definition_ul;

  88.     UID *structural_components_refs;

  89.     int structural_components_count;

  90.     int64_t duration;

  91. } MXFSequence;

  92. 

  93. typedef struct MXFTrack {

  94.     UID uid;

  95.     enum MXFMetadataSetType type;

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

  97.     UID sequence_ref;

  98.     int track_id;

  99.     uint8_t track_number[4];

  100.     AVRational edit_rate;

  101. } MXFTrack;

  102. 

  103. typedef struct MXFDescriptor {

  104.     UID uid;

  105.     enum MXFMetadataSetType type;

  106.     UID essence_container_ul;

  107.     UID essence_codec_ul;

  108.     AVRational sample_rate;

  109.     AVRational aspect_ratio;

  110.     int width;

  111.     int height;

  112.     int channels;

  113.     int bits_per_sample;

  114.     UID *sub_descriptors_refs;

  115.     int sub_descriptors_count;

  116.     int linked_track_id;

  117.     uint8_t *extradata;

  118.     int extradata_size;

  119. } MXFDescriptor;

  120. 

  121. typedef struct MXFPackage {

  122.     UID uid;

  123.     enum MXFMetadataSetType type;

  124.     UID package_uid;

  125.     UID *tracks_refs;

  126.     int tracks_count;

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

  128.     UID descriptor_ref;

  129. } MXFPackage;

  130. 

  131. typedef struct MXFEssenceContainerData {

  132.     UID uid;

  133.     enum MXFMetadataSetType type;

  134.     UID linked_package_uid;

  135. } MXFEssenceContainerData;

  136. 

  137. typedef struct {

  138.     UID uid;

  139.     enum MXFMetadataSetType type;

  140. } MXFMetadataSet;

  141. 

  142. typedef struct MXFContext {

  143.     UID *packages_refs;

  144.     int packages_count;

  145.     MXFMetadataSet **metadata_sets;

  146.     int metadata_sets_count;

  147.     const uint8_t *sync_key;

  148.     AVFormatContext *fc;

  149.     struct AVAES *aesc;

  150. } MXFContext;

  151. 

  152. typedef struct KLVPacket {

  153.     UID key;

  154.     offset_t offset;

  155.     uint64_t length;

  156. } KLVPacket;

  157. 

  158. enum MXFWrappingScheme {

  159.     Frame,

  160.     Clip,

  161. };

  162. 

  163. typedef struct MXFCodecUL {

  164.     UID uid;

  165.     enum CodecID id;

  166.     enum MXFWrappingScheme wrapping;

  167. } MXFCodecUL;

  168. 

  169. typedef struct MXFDataDefinitionUL {

  170.     UID uid;

  171.     enum CodecType type;

  172. } MXFDataDefinitionUL;

  173. 

  174. typedef struct MXFMetadataReadTableEntry {

  175.     const UID key;

  176.     int (*read)();

  177.     int ctx_size;

  178.     enum MXFMetadataSetType type;

  179. } MXFMetadataReadTableEntry;

  180. 

  181. /* partial keys to match */

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

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

  184. /* complete keys to match */

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

  186. static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };

  187. 

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

  189. 

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

  191.                              (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])

  192. 

  193. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  194. {

  195.     uint64_t size = get_byte(pb);

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

  197.         int bytes_num = size & 0x7f;

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

  199.         if (bytes_num > 8)

  200.             return -1;

  201.         size = 0;

  202.         while (bytes_num--)

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

  204.     }

  205.     return size;

  206. }

  207. 

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

  209. {

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

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

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

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

  214. }

  215. 

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

  217. {

  218.     int i;

  219. 

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

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

  222.         /* SMPTE 379M 7.3 */

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

  224.             return i;

  225.     }

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

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

  228. }

  229. 

  230. /* XXX: use AVBitStreamFilter */

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

  232. {

  233.     uint8_t buffer[61444];

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

  235. 

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

  237.         return -1;

  238.     get_buffer(pb, buffer, length);

  239.     av_new_packet(pkt, length);

  240.     data_ptr = pkt->data;

  241.     end_ptr = buffer + length;

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

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

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

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

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

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

  248.             data_ptr += 3;

  249.         } else {

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

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

  252.             data_ptr += 2;

  253.         }

  254.     }

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

  256.     return 0;

  257. }

  258. 

  259. static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)

  260. {

  261.     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};

  262.     MXFContext *mxf = s->priv_data;

  263.     ByteIOContext *pb = &s->pb;

  264.     offset_t end = url_ftell(pb) + klv->length;

  265.     uint64_t size;

  266.     uint64_t orig_size;

  267.     uint64_t plaintext_size;

  268.     uint8_t ivec[16];

  269.     uint8_t tmpbuf[16];

  270.     int index;

  271. 

  272.     if (!mxf->aesc && s->key && s->keylen == 16) {

  273.         mxf->aesc = av_malloc(av_aes_size);

  274.         av_aes_init(mxf->aesc, s->key, 128, 1);

  275.     }

  276.     // crypto context

  277.     url_fskip(pb, klv_decode_ber_length(pb));

  278.     // plaintext offset

  279.     klv_decode_ber_length(pb);

  280.     plaintext_size = get_be64(pb);

  281.     // source klv key

  282.     klv_decode_ber_length(pb);

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

  284.     if (!IS_KLV_KEY(klv, mxf_essence_element_key)) goto err_out;

  285.     index = mxf_get_stream_index(s, klv);

  286.     if (index < 0) goto err_out;

  287.     // source size

  288.     klv_decode_ber_length(pb);

  289.     orig_size = get_be64(pb);

  290.     if (orig_size < plaintext_size) goto err_out;

  291.     // enc. code

  292.     size = klv_decode_ber_length(pb);

  293.     if (size < 32 || size - 32 < orig_size) goto err_out;

  294.     get_buffer(pb, ivec, 16);

  295.     get_buffer(pb, tmpbuf, 16);

  296.     if (mxf->aesc)

  297.         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);

  298.     if (memcmp(tmpbuf, checkv, 16))

  299.         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");

  300.     size -= 32;

  301.     av_get_packet(pb, pkt, size);

  302.     size -= plaintext_size;

  303.     if (mxf->aesc)

  304.         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],

  305.                      &pkt->data[plaintext_size], size >> 4, ivec, 1);

  306.     pkt->size = orig_size;

  307.     pkt->stream_index = index;

  308.     url_fskip(pb, end - url_ftell(pb));

  309.     return 0;

  310. 

  311. err_out:

  312.     url_fskip(pb, end - url_ftell(pb));

  313.     return -1;

  314. }

  315. 

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

  317. {

  318.     MXFContext *mxf = s->priv_data;

  319.     KLVPacket klv;

  320. 

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

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

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

  324.             return -1;

  325.         }

  326. #ifdef DEBUG

  327.         PRINT_KEY(s, "read packet", klv.key);

  328. #endif

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

  330.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  331.             mxf->sync_key = mxf_encrypted_triplet_key;

  332.             if (res < 0) {

  333.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  334.                 return -1;

  335.             }

  336.             return 0;

  337.         }

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

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

  340.             if (index < 0) {

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

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

  343.                 return -1;

  344.             }

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

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

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

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

  349.                     return -1;

  350.                 }

  351.             } else

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

  353.             pkt->stream_index = index;

  354.             return 0;

  355.         } else

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

  357.     }

  358.     return AVERROR_IO;

  359. }

  360. 

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

  362. {

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

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

  365.     mxf->metadata_sets_count++;

  366.     return 0;

  367. }

  368. 

  369. static int mxf_read_metadata_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag)

  370. {

  371.     switch(tag) {

  372.     case 0xFFFE:

  373.         get_buffer(pb, cryptocontext->context_uid, 16);

  374.         break;

  375.     case 0xFFFD:

  376.         get_buffer(pb, cryptocontext->source_container_ul, 16);

  377.         break;

  378.     }

  379.     return 0;

  380. }

  381. 

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

  383. {

  384.     switch (tag) {

  385.     case 0x1901:

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

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

  388.             return -1;

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

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

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

  392.         break;

  393.     }

  394.     return 0;

  395. }

  396. 

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

  398. {

  399.     switch(tag) {

  400.     case 0x0202:

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

  402.         break;

  403.     case 0x1201:

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

  405.         break;

  406.     case 0x1101:

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

  408.         url_fskip(pb, 16);

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

  410.         break;

  411.     case 0x1102:

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

  413.         break;

  414.     }

  415.     return 0;

  416. }

  417. 

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

  419. {

  420.     switch(tag) {

  421.     case 0x4403:

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

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

  424.             return -1;

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

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

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

  428.         break;

  429.     }

  430.     return 0;

  431. }

  432. 

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

  434. {

  435.     switch(tag) {

  436.     case 0x4801:

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

  438.         break;

  439.     case 0x4804:

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

  441.         break;

  442.     case 0x4B01:

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

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

  445.         break;

  446.     case 0x4803:

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

  448.         break;

  449.     }

  450.     return 0;

  451. }

  452. 

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

  454. {

  455.     switch(tag) {

  456.     case 0x0202:

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

  458.         break;

  459.     case 0x0201:

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

  461.         break;

  462.     case 0x1001:

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

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

  465.             return -1;

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

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

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

  469.         break;

  470.     }

  471.     return 0;

  472. }

  473. 

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

  475. {

  476.     switch(tag) {

  477.     case 0x4403:

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

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

  480.             return -1;

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

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

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

  484.         break;

  485.     case 0x4401:

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

  487.         url_fskip(pb, 16);

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

  489.         break;

  490.     case 0x4701:

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

  492.         break;

  493.     }

  494.     return 0;

  495. }

  496. 

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

  498. {

  499.     int code;

  500. 

  501.     do {

  502.         code = get_byte(pb);

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

  504.         switch (code) {

  505.         case 0x52: /* R */

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

  507.             break;

  508.         case 0x47: /* G */

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

  510.             break;

  511.         case 0x42: /* B */

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

  513.             break;

  514.         default:

  515.             get_byte(pb);

  516.         }

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

  518. }

  519. 

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

  521. {

  522.     switch(tag) {

  523.     case 0x3F01:

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

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

  526.             return -1;

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

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

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

  530.         break;

  531.     case 0x3004:

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

  533.         break;

  534.     case 0x3006:

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

  536.         break;

  537.     case 0x3201: /* PictureEssenceCoding */

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

  539.         break;

  540.     case 0x3203:

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

  542.         break;

  543.     case 0x3202:

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

  545.         break;

  546.     case 0x320E:

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

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

  549.         break;

  550.     case 0x3D03:

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

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

  553.         break;

  554.     case 0x3D06: /* SoundEssenceCompression */

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

  556.         break;

  557.     case 0x3D07:

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

  559.         break;

  560.     case 0x3D01:

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

  562.         break;

  563.     case 0x3401:

  564.         mxf_read_metadata_pixel_layout(pb, descriptor);

  565.         break;

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

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

  568.         descriptor->extradata_size = size;

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

  570.         break;

  571.     }

  572.     return 0;

  573. }

  574. 

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

  576. static const MXFDataDefinitionUL mxf_data_definition_uls[] = {

  577.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },

  578.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },

  579.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },

  580.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },

  581. };

  582. 

  583. static const MXFCodecUL mxf_codec_uls[] = {

  584.     /* PictureEssenceCoding */

  585.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */

  586.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */

  587.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */

  588.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */

  589.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */

  590.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */

  591.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */

  592.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */

  593.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */

  594.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x03 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 40Mbps PAL */

  595.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */

  596.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */

  597.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */

  598.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */

  599.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */

  600.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */

  601.     /* SoundEssenceCompression */

  602.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */

  603.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },

  604.     { { 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 */

  605.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },

  606.     { { 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 */

  607.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },

  608.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */

  609.   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */

  610.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  611. };

  612. 

  613. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  614.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */

  615.     { { 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 */

  616.     { { 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 */

  617.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  618. };

  619. 

  620. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  621.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */

  622.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */

  623.     { { 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 */

  624.     { { 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 */

  625.     { { 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 */

  626.     { { 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 */

  627.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x03,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 40Mbps PAL Extended Template */

  628.     { { 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 */

  629.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },

  630. };

  631. 

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

  633. {

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

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

  636.             break;

  637.         uls++;

  638.     }

  639.     return uls;

  640. }

  641. 

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

  643. {

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

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

  646.             break;

  647.         uls++;

  648.     }

  649.     return uls->type;

  650. }

  651. 

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

  653. {

  654.     int i;

  655. 

  656.     if (!strong_ref)

  657.         return NULL;

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

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

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

  661.             return mxf->metadata_sets[i];

  662.         }

  663.     }

  664.     return NULL;

  665. }

  666. 

  667. static int mxf_parse_structural_metadata(MXFContext *mxf)

  668. {

  669.     MXFPackage *material_package = NULL;

  670.     MXFPackage *temp_package = NULL;

  671.     int i, j, k;

  672. 

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

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

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

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

  677.         if (material_package) break;

  678.     }

  679.     if (!material_package) {

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

  681.         return -1;

  682.     }

  683. 

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

  685.         MXFPackage *source_package = NULL;

  686.         MXFTrack *material_track = NULL;

  687.         MXFTrack *source_track = NULL;

  688.         MXFTrack *temp_track = NULL;

  689.         MXFDescriptor *descriptor = NULL;

  690.         MXFStructuralComponent *component = NULL;

  691.         UID *essence_container_ul = NULL;

  692.         const MXFCodecUL *codec_ul = NULL;

  693.         const MXFCodecUL *container_ul = NULL;

  694.         AVStream *st;

  695. 

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

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

  698.             continue;

  699.         }

  700. 

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

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

  703.             return -1;

  704.         }

  705. 

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

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

  708.             /* TODO: handle timecode component */

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

  710.             if (!component)

  711.                 continue;

  712. 

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

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

  715.                 if (!temp_package)

  716.                     continue;

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

  718.                     source_package = temp_package;

  719.                     break;

  720.                 }

  721.             }

  722.             if (!source_package) {

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

  724.                 break;

  725.             }

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

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

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

  729.                     return -1;

  730.                 }

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

  732.                     source_track = temp_track;

  733.                     break;

  734.                 }

  735.             }

  736.             if (!source_track) {

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

  738.                 break;

  739.             }

  740.         }

  741.         if (!source_track)

  742.             continue;

  743. 

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

  745.         st->priv_data = source_track;

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

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

  748.             st->duration = AV_NOPTS_VALUE;

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

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

  751. 

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

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

  754.             return -1;

  755.         }

  756. 

  757. #ifdef DEBUG

  758.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  759. #endif

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

  761. 

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

  763.         if (source_package->descriptor) {

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

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

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

  767. 

  768.                     if (!sub_descriptor) {

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

  770.                         continue;

  771.                     }

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

  773.                         descriptor = sub_descriptor;

  774.                         break;

  775.                     }

  776.                 }

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

  778.                 descriptor = source_package->descriptor;

  779.         }

  780.         if (!descriptor) {

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

  782.             continue;

  783.         }

  784. #ifdef DEBUG

  785.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  786.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  787. #endif

  788.         essence_container_ul = &descriptor->essence_container_ul;

  789.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  790.          * is not allowed according to s429-6, try to find correct information anyway */

  791.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  792.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  793.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  794.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  795.                 if (metadata->type == CryptoContext) {

  796.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  797.                     break;

  798.                 }

  799.             }

  800.         }

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

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

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

  804.         if (descriptor->extradata) {

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

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

  807.         }

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

  809.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

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

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

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

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

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

  815.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  817.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

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

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

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

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

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

  823.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

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

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

  837.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  838.             }

  839.         }

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

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

  842.             st->need_parsing = AVSTREAM_PARSE_FULL;

  843.         }

  844.     }

  845.     return 0;

  846. }

  847. 

  848. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  849.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage, 0, AnyType },

  850.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package, sizeof(MXFPackage), SourcePackage },

  851.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package, sizeof(MXFPackage), MaterialPackage },

  852.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence, sizeof(MXFSequence), Sequence },

  853.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  854.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  855.     { { 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 */

  856.     { { 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 */

  857.     { { 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 */

  858.     { { 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 */

  859.     { { 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 */

  860.     { { 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 */

  861.     { { 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 */

  862.     { { 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 */

  863.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_metadata_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  864.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  865. };

  866. 

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

  868. {

  869.     int i, b;

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

  871.         b = get_byte(pb);

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

  873.             i = 0;

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

  875.             i = -1;

  876.     }

  877.     return i == size;

  878. }

  879. 

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

  881. {

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

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

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

  885. 

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

  887.         int tag = get_be16(pb);

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

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

  890. 

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

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

  893.             continue;

  894.         }

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

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

  897.         else

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

  899. 

  900.         url_fseek(pb, next, SEEK_SET);

  901.     }

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

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

  904. }

  905. 

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

  907. {

  908.     MXFContext *mxf = s->priv_data;

  909.     KLVPacket klv;

  910. 

  911.     mxf->sync_key = mxf_essence_element_key;

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

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

  914.         return -1;

  915.     }

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

  917.     mxf->fc = s;

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

  919.         const MXFMetadataReadTableEntry *metadata;

  920. 

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

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

  923.             return -1;

  924.         }

  925. #ifdef DEBUG

  926.         PRINT_KEY(s, "read header", klv.key);

  927. #endif

  928.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  929.             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  930.             /* FIXME avoid seek */

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

  932.             break;

  933.         }

  934. 

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

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

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

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

  939.                     return -1;

  940.                 }

  941.                 break;

  942.             }

  943.         }

  944.         if (!metadata->read)

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

  946.     }

  947.     return mxf_parse_structural_metadata(mxf);

  948. }

  949. 

  950. static int mxf_read_close(AVFormatContext *s)

  951. {

  952.     MXFContext *mxf = s->priv_data;

  953.     int i;

  954. 

  955.     av_freep(&mxf->packages_refs);

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

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

  958.         case MultipleDescriptor:

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

  960.             break;

  961.         case Sequence:

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

  963.             break;

  964.         case SourcePackage:

  965.         case MaterialPackage:

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

  967.             break;

  968.         default:

  969.             break;

  970.         }

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

  972.     }

  973.     av_freep(&mxf->metadata_sets);

  974.     av_freep(&mxf->aesc);

  975.     return 0;

  976. }

  977. 

  978. static int mxf_probe(AVProbeData *p) {

  979.     uint8_t *bufp = p->buf;

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

  981. 

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

  983.         return 0;

  984. 

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

  986.     end -= sizeof(mxf_header_partition_pack_key);

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

  988.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  989.             return AVPROBE_SCORE_MAX;

  990.     }

  991.     return 0;

  992. }

  993. 

  994. /* rudimentary byte seek */

  995. /* XXX: use MXF Index */

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

  997. {

  998.     MXFContext *mxf = s->priv_data;

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

  1000.     int64_t seconds;

  1001. 

  1002.     if (!s->bit_rate)

  1003.         return -1;

  1004.     if (sample_time < 0)

  1005.         sample_time = 0;

  1006.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1007.     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1008.     if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))

  1009.         return -1;

  1010. 

  1011.     /* found KLV key */

  1012.     url_fseek(&s->pb, -12, SEEK_CUR);

  1013.     av_update_cur_dts(s, st, sample_time);

  1014.     return 0;

  1015. }

  1016. 

  1017. AVInputFormat mxf_demuxer = {

  1018.     "mxf",

  1019.     "MXF format",

  1020.     sizeof(MXFContext),

  1021.     mxf_probe,

  1022.     mxf_read_header,

  1023.     mxf_read_packet,

  1024.     mxf_read_close,

  1025.     mxf_read_seek,

  1026. };