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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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 "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef struct {

  56.     UID uid;

  57.     enum MXFMetadataSetType type;

  58.     UID source_container_ul;

  59. } MXFCryptoContext;

  60. 

  61. typedef struct {

  62.     UID uid;

  63.     enum MXFMetadataSetType type;

  64.     UID source_package_uid;

  65.     UID data_definition_ul;

  66.     int64_t duration;

  67.     int64_t start_position;

  68.     int source_track_id;

  69. } MXFStructuralComponent;

  70. 

  71. typedef struct {

  72.     UID uid;

  73.     enum MXFMetadataSetType type;

  74.     UID data_definition_ul;

  75.     UID *structural_components_refs;

  76.     int structural_components_count;

  77.     int64_t duration;

  78. } MXFSequence;

  79. 

  80. typedef struct {

  81.     UID uid;

  82.     enum MXFMetadataSetType type;

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

  84.     UID sequence_ref;

  85.     int track_id;

  86.     uint8_t track_number[4];

  87.     AVRational edit_rate;

  88. } MXFTrack;

  89. 

  90. typedef struct {

  91.     UID uid;

  92.     enum MXFMetadataSetType type;

  93.     UID essence_container_ul;

  94.     UID essence_codec_ul;

  95.     AVRational sample_rate;

  96.     AVRational aspect_ratio;

  97.     int width;

  98.     int height;

  99.     int channels;

  100.     int bits_per_sample;

  101.     UID *sub_descriptors_refs;

  102.     int sub_descriptors_count;

  103.     int linked_track_id;

  104.     uint8_t *extradata;

  105.     int extradata_size;

  106.     enum PixelFormat pix_fmt;

  107. } MXFDescriptor;

  108. 

  109. typedef struct {

  110.     UID uid;

  111.     enum MXFMetadataSetType type;

  112. } MXFIndexTableSegment;

  113. 

  114. typedef struct {

  115.     UID uid;

  116.     enum MXFMetadataSetType type;

  117.     UID package_uid;

  118.     UID *tracks_refs;

  119.     int tracks_count;

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

  121.     UID descriptor_ref;

  122. } MXFPackage;

  123. 

  124. typedef struct {

  125.     UID uid;

  126.     enum MXFMetadataSetType type;

  127. } MXFMetadataSet;

  128. 

  129. typedef struct {

  130.     UID *packages_refs;

  131.     int packages_count;

  132.     MXFMetadataSet **metadata_sets;

  133.     int metadata_sets_count;

  134.     AVFormatContext *fc;

  135.     struct AVAES *aesc;

  136.     uint8_t *local_tags;

  137.     int local_tags_count;

  138. } MXFContext;

  139. 

  140. enum MXFWrappingScheme {

  141.     Frame,

  142.     Clip,

  143. };

  144. 

  145. typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid);

  146. 

  147. typedef struct {

  148.     const UID key;

  149.     MXFMetadataReadFunc *read;

  150.     int ctx_size;

  151.     enum MXFMetadataSetType type;

  152. } MXFMetadataReadTableEntry;

  153. 

  154. /* partial keys to match */

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

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

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

  158. /* complete keys to match */

  159. 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 };

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

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

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

  163. 

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

  165. 

  166. static int64_t klv_decode_ber_length(AVIOContext *pb)

  167. {

  168.     uint64_t size = avio_r8(pb);

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

  170.         int bytes_num = size & 0x7f;

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

  172.         if (bytes_num > 8)

  173.             return -1;

  174.         size = 0;

  175.         while (bytes_num--)

  176.             size = size << 8 | avio_r8(pb);

  177.     }

  178.     return size;

  179. }

  180. 

  181. static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)

  182. {

  183.     int i, b;

  184.     for (i = 0; i < size && !pb->eof_reached; i++) {

  185.         b = avio_r8(pb);

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

  187.             i = 0;

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

  189.             i = -1;

  190.     }

  191.     return i == size;

  192. }

  193. 

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

  195. {

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

  197.         return -1;

  198.     klv->offset = avio_tell(pb) - 4;

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

  200.     avio_read(pb, klv->key + 4, 12);

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

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

  203. }

  204. 

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

  206. {

  207.     int i;

  208. 

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

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

  211.         /* SMPTE 379M 7.3 */

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

  213.             return i;

  214.     }

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

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

  217. }

  218. 

  219. /* XXX: use AVBitStreamFilter */

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

  221. {

  222.     const uint8_t *buf_ptr, *end_ptr;

  223.     uint8_t *data_ptr;

  224.     int i;

  225. 

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

  227.         return -1;

  228.     length = av_get_packet(pb, pkt, length);

  229.     if (length < 0)

  230.         return length;

  231.     data_ptr = pkt->data;

  232.     end_ptr = pkt->data + length;

  233.     buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */

  234.     for (; buf_ptr + st->codec->channels*4 < end_ptr; ) {

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

  236.             uint32_t sample = bytestream_get_le32(&buf_ptr);

  237.             if (st->codec->bits_per_coded_sample == 24)

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

  239.             else

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

  241.         }

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

  243.     }

  244.     av_shrink_packet(pkt, data_ptr - pkt->data);

  245.     return 0;

  246. }

  247. 

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

  249. {

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

  251.     MXFContext *mxf = s->priv_data;

  252.     AVIOContext *pb = s->pb;

  253.     int64_t end = avio_tell(pb) + klv->length;

  254.     uint64_t size;

  255.     uint64_t orig_size;

  256.     uint64_t plaintext_size;

  257.     uint8_t ivec[16];

  258.     uint8_t tmpbuf[16];

  259.     int index;

  260. 

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

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

  263.         if (!mxf->aesc)

  264.             return -1;

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

  266.     }

  267.     // crypto context

  268.     avio_skip(pb, klv_decode_ber_length(pb));

  269.     // plaintext offset

  270.     klv_decode_ber_length(pb);

  271.     plaintext_size = avio_rb64(pb);

  272.     // source klv key

  273.     klv_decode_ber_length(pb);

  274.     avio_read(pb, klv->key, 16);

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

  276.         return -1;

  277.     index = mxf_get_stream_index(s, klv);

  278.     if (index < 0)

  279.         return -1;

  280.     // source size

  281.     klv_decode_ber_length(pb);

  282.     orig_size = avio_rb64(pb);

  283.     if (orig_size < plaintext_size)

  284.         return -1;

  285.     // enc. code

  286.     size = klv_decode_ber_length(pb);

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

  288.         return -1;

  289.     avio_read(pb, ivec, 16);

  290.     avio_read(pb, tmpbuf, 16);

  291.     if (mxf->aesc)

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

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

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

  295.     size -= 32;

  296.     size = av_get_packet(pb, pkt, size);

  297.     if (size < 0)

  298.         return size;

  299.     else if (size < plaintext_size)

  300.         return AVERROR_INVALIDDATA;

  301.     size -= plaintext_size;

  302.     if (mxf->aesc)

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

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

  305.     av_shrink_packet(pkt, orig_size);

  306.     pkt->stream_index = index;

  307.     avio_skip(pb, end - avio_tell(pb));

  308.     return 0;

  309. }

  310. 

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

  312. {

  313.     KLVPacket klv;

  314. 

  315.     while (!s->pb->eof_reached) {

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

  317.             return -1;

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

  319.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

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

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

  322.             if (res < 0) {

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

  324.                 return -1;

  325.             }

  326.             return 0;

  327.         }

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

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

  330.             if (index < 0) {

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

  332.                 goto skip;

  333.             }

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

  335.                 goto skip;

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

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

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

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

  340.                     return -1;

  341.                 }

  342.             } else {

  343.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  344.                 if (ret < 0)

  345.                     return ret;

  346.             }

  347.             pkt->stream_index = index;

  348.             pkt->pos = klv.offset;

  349.             return 0;

  350.         } else

  351.         skip:

  352.             avio_skip(s->pb, klv.length);

  353.     }

  354.     return AVERROR_EOF;

  355. }

  356. 

  357. static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  358. {

  359.     MXFContext *mxf = arg;

  360.     int item_num = avio_rb32(pb);

  361.     int item_len = avio_rb32(pb);

  362. 

  363.     if (item_len != 18) {

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

  365.         return -1;

  366.     }

  367.     if (item_num > UINT_MAX / item_len)

  368.         return -1;

  369.     mxf->local_tags_count = item_num;

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

  371.     if (!mxf->local_tags)

  372.         return -1;

  373.     avio_read(pb, mxf->local_tags, item_num*item_len);

  374.     return 0;

  375. }

  376. 

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

  378. {

  379.     if (mxf->metadata_sets_count+1 >= UINT_MAX / sizeof(*mxf->metadata_sets))

  380.         return AVERROR(ENOMEM);

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

  382.     if (!mxf->metadata_sets)

  383.         return -1;

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

  385.     mxf->metadata_sets_count++;

  386.     return 0;

  387. }

  388. 

  389. static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  390. {

  391.     MXFCryptoContext *cryptocontext = arg;

  392.     if (size != 16)

  393.         return -1;

  394.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

  395.         avio_read(pb, cryptocontext->source_container_ul, 16);

  396.     return 0;

  397. }

  398. 

  399. static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  400. {

  401.     MXFContext *mxf = arg;

  402.     switch (tag) {

  403.     case 0x1901:

  404.         mxf->packages_count = avio_rb32(pb);

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

  406.             return -1;

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

  408.         if (!mxf->packages_refs)

  409.             return -1;

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

  411.         avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));

  412.         break;

  413.     }

  414.     return 0;

  415. }

  416. 

  417. static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  418. {

  419.     MXFStructuralComponent *source_clip = arg;

  420.     switch(tag) {

  421.     case 0x0202:

  422.         source_clip->duration = avio_rb64(pb);

  423.         break;

  424.     case 0x1201:

  425.         source_clip->start_position = avio_rb64(pb);

  426.         break;

  427.     case 0x1101:

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

  429.         avio_skip(pb, 16);

  430.         avio_read(pb, source_clip->source_package_uid, 16);

  431.         break;

  432.     case 0x1102:

  433.         source_clip->source_track_id = avio_rb32(pb);

  434.         break;

  435.     }

  436.     return 0;

  437. }

  438. 

  439. static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  440. {

  441.     MXFPackage *package = arg;

  442.     switch(tag) {

  443.     case 0x4403:

  444.         package->tracks_count = avio_rb32(pb);

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

  446.             return -1;

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

  448.         if (!package->tracks_refs)

  449.             return -1;

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

  451.         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  452.         break;

  453.     }

  454.     return 0;

  455. }

  456. 

  457. static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  458. {

  459.     MXFTrack *track = arg;

  460.     switch(tag) {

  461.     case 0x4801:

  462.         track->track_id = avio_rb32(pb);

  463.         break;

  464.     case 0x4804:

  465.         avio_read(pb, track->track_number, 4);

  466.         break;

  467.     case 0x4B01:

  468.         track->edit_rate.den = avio_rb32(pb);

  469.         track->edit_rate.num = avio_rb32(pb);

  470.         break;

  471.     case 0x4803:

  472.         avio_read(pb, track->sequence_ref, 16);

  473.         break;

  474.     }

  475.     return 0;

  476. }

  477. 

  478. static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  479. {

  480.     MXFSequence *sequence = arg;

  481.     switch(tag) {

  482.     case 0x0202:

  483.         sequence->duration = avio_rb64(pb);

  484.         break;

  485.     case 0x0201:

  486.         avio_read(pb, sequence->data_definition_ul, 16);

  487.         break;

  488.     case 0x1001:

  489.         sequence->structural_components_count = avio_rb32(pb);

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

  491.             return -1;

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

  493.         if (!sequence->structural_components_refs)

  494.             return -1;

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

  496.         avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));

  497.         break;

  498.     }

  499.     return 0;

  500. }

  501. 

  502. static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  503. {

  504.     MXFPackage *package = arg;

  505.     switch(tag) {

  506.     case 0x4403:

  507.         package->tracks_count = avio_rb32(pb);

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

  509.             return -1;

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

  511.         if (!package->tracks_refs)

  512.             return -1;

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

  514.         avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));

  515.         break;

  516.     case 0x4401:

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

  518.         avio_skip(pb, 16);

  519.         avio_read(pb, package->package_uid, 16);

  520.         break;

  521.     case 0x4701:

  522.         avio_read(pb, package->descriptor_ref, 16);

  523.         break;

  524.     }

  525.     return 0;

  526. }

  527. 

  528. static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  529. {

  530.     switch(tag) {

  531.     case 0x3F05: av_dlog(NULL, "EditUnitByteCount %d\n", avio_rb32(pb)); break;

  532.     case 0x3F06: av_dlog(NULL, "IndexSID %d\n", avio_rb32(pb)); break;

  533.     case 0x3F07: av_dlog(NULL, "BodySID %d\n", avio_rb32(pb)); break;

  534.     case 0x3F0B: av_dlog(NULL, "IndexEditRate %d/%d\n", avio_rb32(pb), avio_rb32(pb)); break;

  535.     case 0x3F0C: av_dlog(NULL, "IndexStartPosition %"PRIu64"\n", avio_rb64(pb)); break;

  536.     case 0x3F0D: av_dlog(NULL, "IndexDuration %"PRIu64"\n", avio_rb64(pb)); break;

  537.     }

  538.     return 0;

  539. }

  540. 

  541. static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)

  542. {

  543.     int code, value, ofs = 0;

  544.     char layout[16] = {0};

  545. 

  546.     do {

  547.         code = avio_r8(pb);

  548.         value = avio_r8(pb);

  549.         av_dlog(NULL, "pixel layout: code %#x\n", code);

  550. 

  551.         if (ofs < 16) {

  552.             layout[ofs++] = code;

  553.             layout[ofs++] = value;

  554.         }

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

  556. 

  557.     ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);

  558. }

  559. 

  560. static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid)

  561. {

  562.     MXFDescriptor *descriptor = arg;

  563.     switch(tag) {

  564.     case 0x3F01:

  565.         descriptor->sub_descriptors_count = avio_rb32(pb);

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

  567.             return -1;

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

  569.         if (!descriptor->sub_descriptors_refs)

  570.             return -1;

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

  572.         avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));

  573.         break;

  574.     case 0x3004:

  575.         avio_read(pb, descriptor->essence_container_ul, 16);

  576.         break;

  577.     case 0x3006:

  578.         descriptor->linked_track_id = avio_rb32(pb);

  579.         break;

  580.     case 0x3201: /* PictureEssenceCoding */

  581.         avio_read(pb, descriptor->essence_codec_ul, 16);

  582.         break;

  583.     case 0x3203:

  584.         descriptor->width = avio_rb32(pb);

  585.         break;

  586.     case 0x3202:

  587.         descriptor->height = avio_rb32(pb);

  588.         break;

  589.     case 0x320E:

  590.         descriptor->aspect_ratio.num = avio_rb32(pb);

  591.         descriptor->aspect_ratio.den = avio_rb32(pb);

  592.         break;

  593.     case 0x3D03:

  594.         descriptor->sample_rate.num = avio_rb32(pb);

  595.         descriptor->sample_rate.den = avio_rb32(pb);

  596.         break;

  597.     case 0x3D06: /* SoundEssenceCompression */

  598.         avio_read(pb, descriptor->essence_codec_ul, 16);

  599.         break;

  600.     case 0x3D07:

  601.         descriptor->channels = avio_rb32(pb);

  602.         break;

  603.     case 0x3D01:

  604.         descriptor->bits_per_sample = avio_rb32(pb);

  605.         break;

  606.     case 0x3401:

  607.         mxf_read_pixel_layout(pb, descriptor);

  608.         break;

  609.     default:

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

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

  612.             descriptor->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  613.             if (!descriptor->extradata)

  614.                 return -1;

  615.             descriptor->extradata_size = size;

  616.             avio_read(pb, descriptor->extradata, size);

  617.         }

  618.         break;

  619.     }

  620.     return 0;

  621. }

  622. 

  623. /*

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

  625.  * Returns: boolean

  626.  */

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

  628. {

  629.     int i;

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

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

  632.             return 0;

  633.     }

  634.     return 1;

  635. }

  636. 

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

  638. {

  639.     while (uls->uid[0]) {

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

  641.             break;

  642.         uls++;

  643.     }

  644.     return uls;

  645. }

  646. 

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

  648. {

  649.     int i;

  650. 

  651.     if (!strong_ref)

  652.         return NULL;

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

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

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

  656.             return mxf->metadata_sets[i];

  657.         }

  658.     }

  659.     return NULL;

  660. }

  661. 

  662. static const MXFCodecUL mxf_essence_container_uls[] = {

  663.     // video essence container uls

  664.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  665.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  666.     // sound essence container uls

  667.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  668.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  669.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  670.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  671. };

  672. 

  673. static int mxf_parse_structural_metadata(MXFContext *mxf)

  674. {

  675.     MXFPackage *material_package = NULL;

  676.     MXFPackage *temp_package = NULL;

  677.     int i, j, k;

  678. 

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

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

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

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

  683.         if (material_package) break;

  684.     }

  685.     if (!material_package) {

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

  687.         return -1;

  688.     }

  689. 

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

  691.         MXFPackage *source_package = NULL;

  692.         MXFTrack *material_track = NULL;

  693.         MXFTrack *source_track = NULL;

  694.         MXFTrack *temp_track = NULL;

  695.         MXFDescriptor *descriptor = NULL;

  696.         MXFStructuralComponent *component = NULL;

  697.         UID *essence_container_ul = NULL;

  698.         const MXFCodecUL *codec_ul = NULL;

  699.         const MXFCodecUL *container_ul = NULL;

  700.         AVStream *st;

  701. 

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

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

  704.             continue;

  705.         }

  706. 

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

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

  709.             continue;

  710.         }

  711. 

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

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

  714.             /* TODO: handle timecode component */

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

  716.             if (!component)

  717.                 continue;

  718. 

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

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

  721.                 if (!temp_package)

  722.                     continue;

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

  724.                     source_package = temp_package;

  725.                     break;

  726.                 }

  727.             }

  728.             if (!source_package) {

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

  730.                 break;

  731.             }

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

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

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

  735.                     return -1;

  736.                 }

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

  738.                     source_track = temp_track;

  739.                     break;

  740.                 }

  741.             }

  742.             if (!source_track) {

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

  744.                 break;

  745.             }

  746.         }

  747.         if (!source_track)

  748.             continue;

  749. 

  750.         st = avformat_new_stream(mxf->fc, NULL);

  751.         if (!st) {

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

  753.             return -1;

  754.         }

  755.         st->id = source_track->track_id;

  756.         st->priv_data = source_track;

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

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

  759.             st->duration = AV_NOPTS_VALUE;

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

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

  762. 

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

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

  765.             return -1;

  766.         }

  767. 

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

  769.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  770.         st->codec->codec_type = codec_ul->id;

  771. 

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

  773.         if (source_package->descriptor) {

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

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

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

  777. 

  778.                     if (!sub_descriptor) {

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

  780.                         continue;

  781.                     }

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

  783.                         descriptor = sub_descriptor;

  784.                         break;

  785.                     }

  786.                 }

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

  788.                 descriptor = source_package->descriptor;

  789.         }

  790.         if (!descriptor) {

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

  792.             continue;

  793.         }

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

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

  796.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  805.                     break;

  806.                 }

  807.             }

  808.         }

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

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

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

  812.         if (descriptor->extradata) {

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

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

  815.         }

  816.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  817.             container_ul = mxf_get_codec_ul(mxf_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->width = descriptor->width;

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

  822.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  823.                 st->codec->pix_fmt = descriptor->pix_fmt;

  824.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  825.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  826.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

  830.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

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

  832.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  844.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  845.             }

  846.         }

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

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

  849.             st->need_parsing = AVSTREAM_PARSE_FULL;

  850.         }

  851.     }

  852.     return 0;

  853. }

  854. 

  855. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  856.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  857.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  858.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  859.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  860.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  861.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  862.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  863.     { { 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 */

  864.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  865.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  866.     { { 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 */

  867.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  868.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  869.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  870.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  871.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  872.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  873.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  874. };

  875. 

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

  877. {

  878.     AVIOContext *pb = mxf->fc->pb;

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

  880.     uint64_t klv_end = avio_tell(pb) + klv->length;

  881. 

  882.     if (!ctx)

  883.         return -1;

  884.     while (avio_tell(pb) + 4 < klv_end) {

  885.         int tag = avio_rb16(pb);

  886.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  887.         uint64_t next = avio_tell(pb) + size;

  888.         UID uid = {0};

  889. 

  890.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

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

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

  893.             continue;

  894.         }

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

  896.             int i;

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

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

  899.                 if (local_tag == tag) {

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

  901.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

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

  903.                 }

  904.             }

  905.         }

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

  907.             avio_read(pb, ctx->uid, 16);

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

  909.             return -1;

  910. 

  911.         avio_seek(pb, next, SEEK_SET);

  912.     }

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

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

  915. }

  916. 

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

  918. {

  919.     MXFContext *mxf = s->priv_data;

  920.     KLVPacket klv;

  921. 

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

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

  924.         return -1;

  925.     }

  926.     avio_seek(s->pb, -14, SEEK_CUR);

  927.     mxf->fc = s;

  928.     while (!s->pb->eof_reached) {

  929.         const MXFMetadataReadTableEntry *metadata;

  930. 

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

  932.             return -1;

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

  934.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

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

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

  937.             /* FIXME avoid seek */

  938.             avio_seek(s->pb, klv.offset, SEEK_SET);

  939.             break;

  940.         }

  941. 

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

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

  944.                 int res;

  945.                 if (klv.key[5] == 0x53) {

  946.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  947.                 } else

  948.                     res = metadata->read(mxf, s->pb, 0, 0, NULL);

  949.                 if (res < 0) {

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

  951.                     return -1;

  952.                 }

  953.                 break;

  954.             }

  955.         }

  956.         if (!metadata->read)

  957.             avio_skip(s->pb, klv.length);

  958.     }

  959.     return mxf_parse_structural_metadata(mxf);

  960. }

  961. 

  962. static int mxf_read_close(AVFormatContext *s)

  963. {

  964.     MXFContext *mxf = s->priv_data;

  965.     int i;

  966. 

  967.     av_freep(&mxf->packages_refs);

  968. 

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

  970.         s->streams[i]->priv_data = NULL;

  971. 

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

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

  974.         case MultipleDescriptor:

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

  976.             break;

  977.         case Sequence:

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

  979.             break;

  980.         case SourcePackage:

  981.         case MaterialPackage:

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

  983.             break;

  984.         default:

  985.             break;

  986.         }

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

  988.     }

  989.     av_freep(&mxf->metadata_sets);

  990.     av_freep(&mxf->aesc);

  991.     av_freep(&mxf->local_tags);

  992.     return 0;

  993. }

  994. 

  995. static int mxf_probe(AVProbeData *p) {

  996.     uint8_t *bufp = p->buf;

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

  998. 

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

  1000.         return 0;

  1001. 

  1002.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1003.     end -= sizeof(mxf_header_partition_pack_key);

  1004.     for (; bufp < end; bufp++) {

  1005.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1006.             return AVPROBE_SCORE_MAX;

  1007.     }

  1008.     return 0;

  1009. }

  1010. 

  1011. /* rudimentary byte seek */

  1012. /* XXX: use MXF Index */

  1013. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1014. {

  1015.     AVStream *st = s->streams[stream_index];

  1016.     int64_t seconds;

  1017. 

  1018.     if (!s->bit_rate)

  1019.         return -1;

  1020.     if (sample_time < 0)

  1021.         sample_time = 0;

  1022.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1023.     avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1024.     ff_update_cur_dts(s, st, sample_time);

  1025.     return 0;

  1026. }

  1027. 

  1028. AVInputFormat ff_mxf_demuxer = {

  1029.     .name           = "mxf",

  1030.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1031.     .priv_data_size = sizeof(MXFContext),

  1032.     .read_probe     = mxf_probe,

  1033.     .read_header    = mxf_read_header,

  1034.     .read_packet    = mxf_read_packet,

  1035.     .read_close     = mxf_read_close,

  1036.     .read_seek      = mxf_read_seek,

  1037. };