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FFmpeg/libavformat/mxfdec.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 "libavutil/aes.h"

  49. #include "mxf.h"

  50. 

  51. typedef struct {

  52.     UID uid;

  53.     enum MXFMetadataSetType type;

  54.     UID source_container_ul;

  55. } MXFCryptoContext;

  56. 

  57. typedef struct {

  58.     UID uid;

  59.     enum MXFMetadataSetType type;

  60.     UID source_package_uid;

  61.     UID data_definition_ul;

  62.     int64_t duration;

  63.     int64_t start_position;

  64.     int source_track_id;

  65. } MXFStructuralComponent;

  66. 

  67. typedef struct {

  68.     UID uid;

  69.     enum MXFMetadataSetType type;

  70.     UID data_definition_ul;

  71.     UID *structural_components_refs;

  72.     int structural_components_count;

  73.     int64_t duration;

  74. } MXFSequence;

  75. 

  76. typedef struct {

  77.     UID uid;

  78.     enum MXFMetadataSetType type;

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

  80.     UID sequence_ref;

  81.     int track_id;

  82.     uint8_t track_number[4];

  83.     AVRational edit_rate;

  84. } MXFTrack;

  85. 

  86. typedef struct {

  87.     UID uid;

  88.     enum MXFMetadataSetType type;

  89.     UID essence_container_ul;

  90.     UID essence_codec_ul;

  91.     AVRational sample_rate;

  92.     AVRational aspect_ratio;

  93.     int width;

  94.     int height;

  95.     int channels;

  96.     int bits_per_sample;

  97.     UID *sub_descriptors_refs;

  98.     int sub_descriptors_count;

  99.     int linked_track_id;

  100.     uint8_t *extradata;

  101.     int extradata_size;

  102. } MXFDescriptor;

  103. 

  104. typedef struct {

  105.     UID uid;

  106.     enum MXFMetadataSetType type;

  107.     UID package_uid;

  108.     UID *tracks_refs;

  109.     int tracks_count;

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

  111.     UID descriptor_ref;

  112. } MXFPackage;

  113. 

  114. typedef struct {

  115.     UID uid;

  116.     enum MXFMetadataSetType type;

  117. } MXFMetadataSet;

  118. 

  119. typedef struct {

  120.     UID *packages_refs;

  121.     int packages_count;

  122.     MXFMetadataSet **metadata_sets;

  123.     int metadata_sets_count;

  124.     AVFormatContext *fc;

  125.     struct AVAES *aesc;

  126.     uint8_t *local_tags;

  127.     int local_tags_count;

  128. } MXFContext;

  129. 

  130. enum MXFWrappingScheme {

  131.     Frame,

  132.     Clip,

  133. };

  134. 

  135. typedef struct {

  136.     const UID key;

  137.     int (*read)();

  138.     int ctx_size;

  139.     enum MXFMetadataSetType type;

  140. } MXFMetadataReadTableEntry;

  141. 

  142. /* partial keys to match */

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

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

  145. static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };

  146. /* complete keys to match */

  147. static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };

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

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

  150. static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };

  151. 

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

  153. 

  154. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  155. {

  156.     uint64_t size = get_byte(pb);

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

  158.         int bytes_num = size & 0x7f;

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

  160.         if (bytes_num > 8)

  161.             return -1;

  162.         size = 0;

  163.         while (bytes_num--)

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

  165.     }

  166.     return size;

  167. }

  168. 

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

  170. {

  171.     int i, b;

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

  173.         b = get_byte(pb);

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

  175.             i = 0;

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

  177.             i = -1;

  178.     }

  179.     return i == size;

  180. }

  181. 

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

  183. {

  184.     if (!mxf_read_sync(pb, mxf_klv_key, 4))

  185.         return -1;

  186.     klv->offset = url_ftell(pb) - 4;

  187.     memcpy(klv->key, mxf_klv_key, 4);

  188.     get_buffer(pb, klv->key + 4, 12);

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

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

  191. }

  192. 

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

  194. {

  195.     int i;

  196. 

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

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

  199.         /* SMPTE 379M 7.3 */

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

  201.             return i;

  202.     }

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

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

  205. }

  206. 

  207. /* XXX: use AVBitStreamFilter */

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

  209. {

  210.     uint8_t buffer[61444];

  211.     const uint8_t *buf_ptr, *end_ptr;

  212.     uint8_t *data_ptr;

  213.     int i;

  214. 

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

  216.         return -1;

  217.     get_buffer(pb, buffer, length);

  218.     av_new_packet(pkt, length);

  219.     data_ptr = pkt->data;

  220.     end_ptr = buffer + length;

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

  222.     for (; buf_ptr < end_ptr; ) {

  223.         for (i = 0; i < st->codec->channels; i++) {

  224.             uint32_t sample = bytestream_get_le32(&buf_ptr);

  225.             if (st->codec->bits_per_sample == 24)

  226.                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);

  227.             else

  228.                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);

  229.         }

  230.         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M

  231.     }

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

  233.     return 0;

  234. }

  235. 

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

  237. {

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

  239.     MXFContext *mxf = s->priv_data;

  240.     ByteIOContext *pb = s->pb;

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

  242.     uint64_t size;

  243.     uint64_t orig_size;

  244.     uint64_t plaintext_size;

  245.     uint8_t ivec[16];

  246.     uint8_t tmpbuf[16];

  247.     int index;

  248. 

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

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

  251.         if (!mxf->aesc)

  252.             return -1;

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

  254.     }

  255.     // crypto context

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

  257.     // plaintext offset

  258.     klv_decode_ber_length(pb);

  259.     plaintext_size = get_be64(pb);

  260.     // source klv key

  261.     klv_decode_ber_length(pb);

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

  263.     if (!IS_KLV_KEY(klv, mxf_essence_element_key))

  264.         return -1;

  265.     index = mxf_get_stream_index(s, klv);

  266.     if (index < 0)

  267.         return -1;

  268.     // source size

  269.     klv_decode_ber_length(pb);

  270.     orig_size = get_be64(pb);

  271.     if (orig_size < plaintext_size)

  272.         return -1;

  273.     // enc. code

  274.     size = klv_decode_ber_length(pb);

  275.     if (size < 32 || size - 32 < orig_size)

  276.         return -1;

  277.     get_buffer(pb, ivec, 16);

  278.     get_buffer(pb, tmpbuf, 16);

  279.     if (mxf->aesc)

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

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

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

  283.     size -= 32;

  284.     av_get_packet(pb, pkt, size);

  285.     size -= plaintext_size;

  286.     if (mxf->aesc)

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

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

  289.     pkt->size = orig_size;

  290.     pkt->stream_index = index;

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

  292.     return 0;

  293. }

  294. 

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

  296. {

  297.     KLVPacket klv;

  298. 

  299.     while (!url_feof(s->pb)) {

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

  301.             return -1;

  302. #ifdef DEBUG

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

  304. #endif

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

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

  307.             if (res < 0) {

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

  309.                 return -1;

  310.             }

  311.             return 0;

  312.         }

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

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

  315.             if (index < 0) {

  316.                 av_log(s, AV_LOG_ERROR, "error getting stream index %x\n", AV_RB32(klv.key+12));

  317.                 goto skip;

  318.             }

  319.             if (s->streams[index]->discard == AVDISCARD_ALL)

  320.                 goto skip;

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

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

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

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

  325.                     return -1;

  326.                 }

  327.             } else

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

  329.             pkt->stream_index = index;

  330.             pkt->pos = klv.offset;

  331.             return 0;

  332.         } else

  333.         skip:

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

  335.     }

  336.     return AVERROR(EIO);

  337. }

  338. 

  339. static int mxf_read_primer_pack(MXFContext *mxf)

  340. {

  341.     ByteIOContext *pb = mxf->fc->pb;

  342.     int item_num = get_be32(pb);

  343.     int item_len = get_be32(pb);

  344. 

  345.     if (item_len != 18) {

  346.         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");

  347.         return -1;

  348.     }

  349.     if (item_num > UINT_MAX / item_len)

  350.         return -1;

  351.     mxf->local_tags_count = item_num;

  352.     mxf->local_tags = av_malloc(item_num*item_len);

  353.     if (!mxf->local_tags)

  354.         return -1;

  355.     get_buffer(pb, mxf->local_tags, item_num*item_len);

  356.     return 0;

  357. }

  358. 

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

  360. {

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

  362.     if (!mxf->metadata_sets)

  363.         return -1;

  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_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)

  370. {

  371.     if (size != 16)

  372.         return -1;

  373.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  375.     return 0;

  376. }

  377. 

  378. static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)

  379. {

  380.     switch (tag) {

  381.     case 0x1901:

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

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

  384.             return -1;

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

  386.         if (!mxf->packages_refs)

  387.             return -1;

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

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

  390.         break;

  391.     }

  392.     return 0;

  393. }

  394. 

  395. static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)

  396. {

  397.     switch(tag) {

  398.     case 0x0202:

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

  400.         break;

  401.     case 0x1201:

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

  403.         break;

  404.     case 0x1101:

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

  406.         url_fskip(pb, 16);

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

  408.         break;

  409.     case 0x1102:

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

  411.         break;

  412.     }

  413.     return 0;

  414. }

  415. 

  416. static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)

  417. {

  418.     switch(tag) {

  419.     case 0x4403:

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

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

  422.             return -1;

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

  424.         if (!package->tracks_refs)

  425.             return -1;

  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_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_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.         if (!sequence->structural_components_refs)

  468.             return -1;

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

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

  471.         break;

  472.     }

  473.     return 0;

  474. }

  475. 

  476. static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)

  477. {

  478.     switch(tag) {

  479.     case 0x4403:

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

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

  482.             return -1;

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

  484.         if (!package->tracks_refs)

  485.             return -1;

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

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

  488.         break;

  489.     case 0x4401:

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

  491.         url_fskip(pb, 16);

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

  493.         break;

  494.     case 0x4701:

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

  496.         break;

  497.     }

  498.     return 0;

  499. }

  500. 

  501. static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)

  502. {

  503.     int code;

  504. 

  505.     do {

  506.         code = get_byte(pb);

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

  508.         switch (code) {

  509.         case 0x52: /* R */

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

  511.             break;

  512.         case 0x47: /* G */

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

  514.             break;

  515.         case 0x42: /* B */

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

  517.             break;

  518.         default:

  519.             get_byte(pb);

  520.         }

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

  522. }

  523. 

  524. static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)

  525. {

  526.     switch(tag) {

  527.     case 0x3F01:

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

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

  530.             return -1;

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

  532.         if (!descriptor->sub_descriptors_refs)

  533.             return -1;

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

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

  536.         break;

  537.     case 0x3004:

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

  539.         break;

  540.     case 0x3006:

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

  542.         break;

  543.     case 0x3201: /* PictureEssenceCoding */

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

  545.         break;

  546.     case 0x3203:

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

  548.         break;

  549.     case 0x3202:

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

  551.         break;

  552.     case 0x320E:

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

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

  555.         break;

  556.     case 0x3D03:

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

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

  559.         break;

  560.     case 0x3D06: /* SoundEssenceCompression */

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

  562.         break;

  563.     case 0x3D07:

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

  565.         break;

  566.     case 0x3D01:

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

  568.         break;

  569.     case 0x3401:

  570.         mxf_read_pixel_layout(pb, descriptor);

  571.         break;

  572.     default:

  573.         /* Private uid used by SONY C0023S01.mxf */

  574.         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {

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

  576.             if (!descriptor->extradata)

  577.                 return -1;

  578.             descriptor->extradata_size = size;

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

  580.         }

  581.         break;

  582.     }

  583.     return 0;

  584. }

  585. 

  586. /*

  587.  * Match an uid independently of the version byte and up to len common bytes

  588.  * Returns: boolean

  589.  */

  590. static int mxf_match_uid(const UID key, const UID uid, int len)

  591. {

  592.     int i;

  593.     for (i = 0; i < len; i++) {

  594.         if (i != 7 && key[i] != uid[i])

  595.             return 0;

  596.     }

  597.     return 1;

  598. }

  599. 

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

  601. {

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

  603.         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))

  604.             break;

  605.         uls++;

  606.     }

  607.     return uls;

  608. }

  609. 

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

  611. {

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

  613.         if(mxf_match_uid(uls->uid, *uid, 16))

  614.             break;

  615.         uls++;

  616.     }

  617.     return uls->type;

  618. }

  619. 

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

  621. {

  622.     int i;

  623. 

  624.     if (!strong_ref)

  625.         return NULL;

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

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

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

  629.             return mxf->metadata_sets[i];

  630.         }

  631.     }

  632.     return NULL;

  633. }

  634. 

  635. static int mxf_parse_structural_metadata(MXFContext *mxf)

  636. {

  637.     MXFPackage *material_package = NULL;

  638.     MXFPackage *temp_package = NULL;

  639.     int i, j, k;

  640. 

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

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

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

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

  645.         if (material_package) break;

  646.     }

  647.     if (!material_package) {

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

  649.         return -1;

  650.     }

  651. 

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

  653.         MXFPackage *source_package = NULL;

  654.         MXFTrack *material_track = NULL;

  655.         MXFTrack *source_track = NULL;

  656.         MXFTrack *temp_track = NULL;

  657.         MXFDescriptor *descriptor = NULL;

  658.         MXFStructuralComponent *component = NULL;

  659.         UID *essence_container_ul = NULL;

  660.         const MXFCodecUL *codec_ul = NULL;

  661.         const MXFCodecUL *container_ul = NULL;

  662.         AVStream *st;

  663. 

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

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

  666.             continue;

  667.         }

  668. 

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

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

  671.             return -1;

  672.         }

  673. 

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

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

  676.             /* TODO: handle timecode component */

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

  678.             if (!component)

  679.                 continue;

  680. 

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

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

  683.                 if (!temp_package)

  684.                     continue;

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

  686.                     source_package = temp_package;

  687.                     break;

  688.                 }

  689.             }

  690.             if (!source_package) {

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

  692.                 break;

  693.             }

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

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

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

  697.                     return -1;

  698.                 }

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

  700.                     source_track = temp_track;

  701.                     break;

  702.                 }

  703.             }

  704.             if (!source_track) {

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

  706.                 break;

  707.             }

  708.         }

  709.         if (!source_track)

  710.             continue;

  711. 

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

  713.         if (!st) {

  714.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  715.             return -1;

  716.         }

  717.         st->priv_data = source_track;

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

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

  720.             st->duration = AV_NOPTS_VALUE;

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

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

  723. 

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

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

  726.             return -1;

  727.         }

  728. 

  729. #ifdef DEBUG

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

  731. #endif

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

  733. 

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

  735.         if (source_package->descriptor) {

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

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

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

  739. 

  740.                     if (!sub_descriptor) {

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

  742.                         continue;

  743.                     }

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

  745.                         descriptor = sub_descriptor;

  746.                         break;

  747.                     }

  748.                 }

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

  750.                 descriptor = source_package->descriptor;

  751.         }

  752.         if (!descriptor) {

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

  754.             continue;

  755.         }

  756. #ifdef DEBUG

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

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

  759. #endif

  760.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  769.                     break;

  770.                 }

  771.             }

  772.         }

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

  774.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

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

  776.         if (descriptor->extradata) {

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

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

  779.         }

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

  781.             container_ul = mxf_get_codec_ul(ff_mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  787.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  789.             container_ul = mxf_get_codec_ul(ff_mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  795.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  807.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  808.             }

  809.         }

  810.         if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  811.             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");

  812.             st->need_parsing = AVSTREAM_PARSE_FULL;

  813.         }

  814.     }

  815.     return 0;

  816. }

  817. 

  818. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  819.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  820.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  821.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  822.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  823.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  824.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  825.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  826.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */

  827.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  828.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  829.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */

  830.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  831.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  832.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  833.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  834.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  835.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  836. };

  837. 

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

  839. {

  840.     ByteIOContext *pb = mxf->fc->pb;

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

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

  843. 

  844.     if (!ctx)

  845.         return -1;

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

  847.         int tag = get_be16(pb);

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

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

  850.         UID uid = {0};

  851. 

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

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

  854.             continue;

  855.         }

  856.         if (tag > 0x7FFF) { /* dynamic tag */

  857.             int i;

  858.             for (i = 0; i < mxf->local_tags_count; i++) {

  859.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  860.                 if (local_tag == tag) {

  861.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  862.                     dprintf(mxf->fc, "local tag 0x%04X\n", local_tag);

  863. #ifdef DEBUG

  864.                     PRINT_KEY(mxf->fc, "uid", uid);

  865. #endif

  866.                 }

  867.             }

  868.         }

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

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

  871.         else if (read_child(ctx, pb, tag, size, uid) < 0)

  872.             return -1;

  873. 

  874.         url_fseek(pb, next, SEEK_SET);

  875.     }

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

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

  878. }

  879. 

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

  881. {

  882.     MXFContext *mxf = s->priv_data;

  883.     KLVPacket klv;

  884. 

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

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

  887.         return -1;

  888.     }

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

  890.     mxf->fc = s;

  891.     while (!url_feof(s->pb)) {

  892.         const MXFMetadataReadTableEntry *metadata;

  893. 

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

  895.             return -1;

  896. #ifdef DEBUG

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

  898. #endif

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

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

  901.             /* FIXME avoid seek */

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

  903.             break;

  904.         }

  905. 

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

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

  908.                 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;

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

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

  911.                     return -1;

  912.                 }

  913.                 break;

  914.             }

  915.         }

  916.         if (!metadata->read)

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

  918.     }

  919.     return mxf_parse_structural_metadata(mxf);

  920. }

  921. 

  922. static int mxf_read_close(AVFormatContext *s)

  923. {

  924.     MXFContext *mxf = s->priv_data;

  925.     int i;

  926. 

  927.     av_freep(&mxf->packages_refs);

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

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

  930.         case MultipleDescriptor:

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

  932.             break;

  933.         case Sequence:

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

  935.             break;

  936.         case SourcePackage:

  937.         case MaterialPackage:

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

  939.             break;

  940.         case Track:

  941.             mxf->metadata_sets[i] = NULL; /* will be freed later */

  942.             break;

  943.         default:

  944.             break;

  945.         }

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

  947.     }

  948.     av_freep(&mxf->metadata_sets);

  949.     av_freep(&mxf->aesc);

  950.     av_freep(&mxf->local_tags);

  951.     return 0;

  952. }

  953. 

  954. static int mxf_probe(AVProbeData *p) {

  955.     uint8_t *bufp = p->buf;

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

  957. 

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

  959.         return 0;

  960. 

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

  962.     end -= sizeof(mxf_header_partition_pack_key);

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

  964.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  965.             return AVPROBE_SCORE_MAX;

  966.     }

  967.     return 0;

  968. }

  969. 

  970. /* rudimentary byte seek */

  971. /* XXX: use MXF Index */

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

  973. {

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

  975.     int64_t seconds;

  976. 

  977.     if (!s->bit_rate)

  978.         return -1;

  979.     if (sample_time < 0)

  980.         sample_time = 0;

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

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

  983.     av_update_cur_dts(s, st, sample_time);

  984.     return 0;

  985. }

  986. 

  987. AVInputFormat mxf_demuxer = {

  988.     "mxf",

  989.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  990.     sizeof(MXFContext),

  991.     mxf_probe,

  992.     mxf_read_header,

  993.     mxf_read_packet,

  994.     mxf_read_close,

  995.     mxf_read_seek,

  996. };