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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 "libavcodec/bytestream.h"

  50. #include "avformat.h"

  51. #include "mxf.h"

  52. 

  53. typedef struct {

  54.     UID uid;

  55.     enum MXFMetadataSetType type;

  56.     UID source_container_ul;

  57. } MXFCryptoContext;

  58. 

  59. typedef struct {

  60.     UID uid;

  61.     enum MXFMetadataSetType type;

  62.     UID source_package_uid;

  63.     UID data_definition_ul;

  64.     int64_t duration;

  65.     int64_t start_position;

  66.     int source_track_id;

  67. } MXFStructuralComponent;

  68. 

  69. typedef struct {

  70.     UID uid;

  71.     enum MXFMetadataSetType type;

  72.     UID data_definition_ul;

  73.     UID *structural_components_refs;

  74.     int structural_components_count;

  75.     int64_t duration;

  76. } MXFSequence;

  77. 

  78. typedef struct {

  79.     UID uid;

  80.     enum MXFMetadataSetType type;

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

  82.     UID sequence_ref;

  83.     int track_id;

  84.     uint8_t track_number[4];

  85.     AVRational edit_rate;

  86. } MXFTrack;

  87. 

  88. typedef struct {

  89.     UID uid;

  90.     enum MXFMetadataSetType type;

  91.     UID essence_container_ul;

  92.     UID essence_codec_ul;

  93.     AVRational sample_rate;

  94.     AVRational aspect_ratio;

  95.     int width;

  96.     int height;

  97.     int channels;

  98.     int bits_per_sample;

  99.     UID *sub_descriptors_refs;

  100.     int sub_descriptors_count;

  101.     int linked_track_id;

  102.     uint8_t *extradata;

  103.     int extradata_size;

  104.     enum PixelFormat pix_fmt;

  105. } MXFDescriptor;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110. } MXFIndexTableSegment;

  111. 

  112. typedef struct {

  113.     UID uid;

  114.     enum MXFMetadataSetType type;

  115.     UID package_uid;

  116.     UID *tracks_refs;

  117.     int tracks_count;

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

  119.     UID descriptor_ref;

  120. } MXFPackage;

  121. 

  122. typedef struct {

  123.     UID uid;

  124.     enum MXFMetadataSetType type;

  125. } MXFMetadataSet;

  126. 

  127. typedef struct {

  128.     UID *packages_refs;

  129.     int packages_count;

  130.     MXFMetadataSet **metadata_sets;

  131.     int metadata_sets_count;

  132.     AVFormatContext *fc;

  133.     struct AVAES *aesc;

  134.     uint8_t *local_tags;

  135.     int local_tags_count;

  136. } MXFContext;

  137. 

  138. enum MXFWrappingScheme {

  139.     Frame,

  140.     Clip,

  141. };

  142. 

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

  144. 

  145. typedef struct {

  146.     const UID key;

  147.     MXFMetadataReadFunc *read;

  148.     int ctx_size;

  149.     enum MXFMetadataSetType type;

  150. } MXFMetadataReadTableEntry;

  151. 

  152. /* partial keys to match */

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

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

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

  156. /* complete keys to match */

  157. 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 };

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

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

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

  161. 

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

  163. 

  164. static int64_t klv_decode_ber_length(ByteIOContext *pb)

  165. {

  166.     uint64_t size = get_byte(pb);

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

  168.         int bytes_num = size & 0x7f;

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

  170.         if (bytes_num > 8)

  171.             return -1;

  172.         size = 0;

  173.         while (bytes_num--)

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

  175.     }

  176.     return size;

  177. }

  178. 

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

  180. {

  181.     int i, b;

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

  183.         b = get_byte(pb);

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

  185.             i = 0;

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

  187.             i = -1;

  188.     }

  189.     return i == size;

  190. }

  191. 

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

  193. {

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

  195.         return -1;

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

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

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

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

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

  201. }

  202. 

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

  204. {

  205.     int i;

  206. 

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

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

  209.         /* SMPTE 379M 7.3 */

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

  211.             return i;

  212.     }

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

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

  215. }

  216. 

  217. /* XXX: use AVBitStreamFilter */

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

  219. {

  220.     const uint8_t *buf_ptr, *end_ptr;

  221.     uint8_t *data_ptr;

  222.     int i;

  223. 

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

  225.         return -1;

  226.     av_new_packet(pkt, length);

  227.     get_buffer(pb, pkt->data, length);

  228.     data_ptr = pkt->data;

  229.     end_ptr = pkt->data + length;

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

  231.     for (; buf_ptr < end_ptr; ) {

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

  233.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  236.             else

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

  238.         }

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

  240.     }

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

  242.     return 0;

  243. }

  244. 

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

  246. {

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

  248.     MXFContext *mxf = s->priv_data;

  249.     ByteIOContext *pb = s->pb;

  250.     int64_t end = url_ftell(pb) + klv->length;

  251.     uint64_t size;

  252.     uint64_t orig_size;

  253.     uint64_t plaintext_size;

  254.     uint8_t ivec[16];

  255.     uint8_t tmpbuf[16];

  256.     int index;

  257. 

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

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

  260.         if (!mxf->aesc)

  261.             return -1;

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

  263.     }

  264.     // crypto context

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

  266.     // plaintext offset

  267.     klv_decode_ber_length(pb);

  268.     plaintext_size = get_be64(pb);

  269.     // source klv key

  270.     klv_decode_ber_length(pb);

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

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

  273.         return -1;

  274.     index = mxf_get_stream_index(s, klv);

  275.     if (index < 0)

  276.         return -1;

  277.     // source size

  278.     klv_decode_ber_length(pb);

  279.     orig_size = get_be64(pb);

  280.     if (orig_size < plaintext_size)

  281.         return -1;

  282.     // enc. code

  283.     size = klv_decode_ber_length(pb);

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

  285.         return -1;

  286.     get_buffer(pb, ivec, 16);

  287.     get_buffer(pb, tmpbuf, 16);

  288.     if (mxf->aesc)

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

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

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

  292.     size -= 32;

  293.     av_get_packet(pb, pkt, size);

  294.     size -= plaintext_size;

  295.     if (mxf->aesc)

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

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

  298.     pkt->size = orig_size;

  299.     pkt->stream_index = index;

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

  301.     return 0;

  302. }

  303. 

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

  305. {

  306.     KLVPacket klv;

  307. 

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

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

  310.             return -1;

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

  312.         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);

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

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

  315.             if (res < 0) {

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

  317.                 return -1;

  318.             }

  319.             return 0;

  320.         }

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

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

  323.             if (index < 0) {

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

  325.                 goto skip;

  326.             }

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

  328.                 goto skip;

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

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

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

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

  333.                     return -1;

  334.                 }

  335.             } else

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

  337.             pkt->stream_index = index;

  338.             pkt->pos = klv.offset;

  339.             return 0;

  340.         } else

  341.         skip:

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

  343.     }

  344.     return AVERROR_EOF;

  345. }

  346. 

  347. static int mxf_read_primer_pack(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  348. {

  349.     MXFContext *mxf = arg;

  350.     int item_num = get_be32(pb);

  351.     int item_len = get_be32(pb);

  352. 

  353.     if (item_len != 18) {

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

  355.         return -1;

  356.     }

  357.     if (item_num > UINT_MAX / item_len)

  358.         return -1;

  359.     mxf->local_tags_count = item_num;

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

  361.     if (!mxf->local_tags)

  362.         return -1;

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

  364.     return 0;

  365. }

  366. 

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

  368. {

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

  370.         return AVERROR(ENOMEM);

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

  372.     if (!mxf->metadata_sets)

  373.         return -1;

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

  375.     mxf->metadata_sets_count++;

  376.     return 0;

  377. }

  378. 

  379. static int mxf_read_cryptographic_context(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  380. {

  381.     MXFCryptoContext *cryptocontext = arg;

  382.     if (size != 16)

  383.         return -1;

  384.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  386.     return 0;

  387. }

  388. 

  389. static int mxf_read_content_storage(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  390. {

  391.     MXFContext *mxf = arg;

  392.     switch (tag) {

  393.     case 0x1901:

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

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

  396.             return -1;

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

  398.         if (!mxf->packages_refs)

  399.             return -1;

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

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

  402.         break;

  403.     }

  404.     return 0;

  405. }

  406. 

  407. static int mxf_read_source_clip(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  408. {

  409.     MXFStructuralComponent *source_clip = arg;

  410.     switch(tag) {

  411.     case 0x0202:

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

  413.         break;

  414.     case 0x1201:

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

  416.         break;

  417.     case 0x1101:

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

  419.         url_fskip(pb, 16);

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

  421.         break;

  422.     case 0x1102:

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

  424.         break;

  425.     }

  426.     return 0;

  427. }

  428. 

  429. static int mxf_read_material_package(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  430. {

  431.     MXFPackage *package = arg;

  432.     switch(tag) {

  433.     case 0x4403:

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

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

  436.             return -1;

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

  438.         if (!package->tracks_refs)

  439.             return -1;

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

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

  442.         break;

  443.     }

  444.     return 0;

  445. }

  446. 

  447. static int mxf_read_track(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  448. {

  449.     MXFTrack *track = arg;

  450.     switch(tag) {

  451.     case 0x4801:

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

  453.         break;

  454.     case 0x4804:

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

  456.         break;

  457.     case 0x4B01:

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

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

  460.         break;

  461.     case 0x4803:

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

  463.         break;

  464.     }

  465.     return 0;

  466. }

  467. 

  468. static int mxf_read_sequence(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  469. {

  470.     MXFSequence *sequence = arg;

  471.     switch(tag) {

  472.     case 0x0202:

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

  474.         break;

  475.     case 0x0201:

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

  477.         break;

  478.     case 0x1001:

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

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

  481.             return -1;

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

  483.         if (!sequence->structural_components_refs)

  484.             return -1;

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

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

  487.         break;

  488.     }

  489.     return 0;

  490. }

  491. 

  492. static int mxf_read_source_package(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  493. {

  494.     MXFPackage *package = arg;

  495.     switch(tag) {

  496.     case 0x4403:

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

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

  499.             return -1;

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

  501.         if (!package->tracks_refs)

  502.             return -1;

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

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

  505.         break;

  506.     case 0x4401:

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

  508.         url_fskip(pb, 16);

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

  510.         break;

  511.     case 0x4701:

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

  513.         break;

  514.     }

  515.     return 0;

  516. }

  517. 

  518. static int mxf_read_index_table_segment(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  519. {

  520.     switch(tag) {

  521.     case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break;

  522.     case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break;

  523.     case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break;

  524.     case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break;

  525.     case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break;

  526.     case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break;

  527.     }

  528.     return 0;

  529. }

  530. 

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

  532. {

  533.     int code, value, ofs = 0;

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

  535. 

  536.     do {

  537.         code = get_byte(pb);

  538.         value = get_byte(pb);

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

  540. 

  541.         if (ofs < 16) {

  542.             layout[ofs++] = code;

  543.             layout[ofs++] = value;

  544.         }

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

  546. 

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

  548. }

  549. 

  550. static int mxf_read_generic_descriptor(void *arg, ByteIOContext *pb, int tag, int size, UID uid)

  551. {

  552.     MXFDescriptor *descriptor = arg;

  553.     switch(tag) {

  554.     case 0x3F01:

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

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

  557.             return -1;

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

  559.         if (!descriptor->sub_descriptors_refs)

  560.             return -1;

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

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

  563.         break;

  564.     case 0x3004:

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

  566.         break;

  567.     case 0x3006:

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

  569.         break;

  570.     case 0x3201: /* PictureEssenceCoding */

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

  572.         break;

  573.     case 0x3203:

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

  575.         break;

  576.     case 0x3202:

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

  578.         break;

  579.     case 0x320E:

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

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

  582.         break;

  583.     case 0x3D03:

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

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

  586.         break;

  587.     case 0x3D06: /* SoundEssenceCompression */

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

  589.         break;

  590.     case 0x3D07:

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

  592.         break;

  593.     case 0x3D01:

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

  595.         break;

  596.     case 0x3401:

  597.         mxf_read_pixel_layout(pb, descriptor);

  598.         break;

  599.     default:

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

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

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

  603.             if (!descriptor->extradata)

  604.                 return -1;

  605.             descriptor->extradata_size = size;

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

  607.         }

  608.         break;

  609.     }

  610.     return 0;

  611. }

  612. 

  613. /*

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

  615.  * Returns: boolean

  616.  */

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

  618. {

  619.     int i;

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

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

  622.             return 0;

  623.     }

  624.     return 1;

  625. }

  626. 

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

  628. {

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

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

  631.             break;

  632.         uls++;

  633.     }

  634.     return uls;

  635. }

  636. 

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

  638. {

  639.     int i;

  640. 

  641.     if (!strong_ref)

  642.         return NULL;

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

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

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

  646.             return mxf->metadata_sets[i];

  647.         }

  648.     }

  649.     return NULL;

  650. }

  651. 

  652. static const MXFCodecUL mxf_essence_container_uls[] = {

  653.     // video essence container uls

  654.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  655.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  656.     // sound essence container uls

  657.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  658.     { { 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 */

  659.     { { 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 */

  660.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  661. };

  662. 

  663. static int mxf_parse_structural_metadata(MXFContext *mxf)

  664. {

  665.     MXFPackage *material_package = NULL;

  666.     MXFPackage *temp_package = NULL;

  667.     int i, j, k;

  668. 

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

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

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

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

  673.         if (material_package) break;

  674.     }

  675.     if (!material_package) {

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

  677.         return -1;

  678.     }

  679. 

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

  681.         MXFPackage *source_package = NULL;

  682.         MXFTrack *material_track = NULL;

  683.         MXFTrack *source_track = NULL;

  684.         MXFTrack *temp_track = NULL;

  685.         MXFDescriptor *descriptor = NULL;

  686.         MXFStructuralComponent *component = NULL;

  687.         UID *essence_container_ul = NULL;

  688.         const MXFCodecUL *codec_ul = NULL;

  689.         const MXFCodecUL *container_ul = NULL;

  690.         AVStream *st;

  691. 

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

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

  694.             continue;

  695.         }

  696. 

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

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

  699.             continue;

  700.         }

  701. 

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

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

  704.             /* TODO: handle timecode component */

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

  706.             if (!component)

  707.                 continue;

  708. 

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

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

  711.                 if (!temp_package)

  712.                     continue;

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

  714.                     source_package = temp_package;

  715.                     break;

  716.                 }

  717.             }

  718.             if (!source_package) {

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

  720.                 break;

  721.             }

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

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

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

  725.                     return -1;

  726.                 }

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

  728.                     source_track = temp_track;

  729.                     break;

  730.                 }

  731.             }

  732.             if (!source_track) {

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

  734.                 break;

  735.             }

  736.         }

  737.         if (!source_track)

  738.             continue;

  739. 

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

  741.         if (!st) {

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

  743.             return -1;

  744.         }

  745.         st->priv_data = source_track;

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

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

  748.             st->duration = AV_NOPTS_VALUE;

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

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

  751. 

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

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

  754.             return -1;

  755.         }

  756. 

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

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

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

  760. 

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

  762.         if (source_package->descriptor) {

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

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

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

  766. 

  767.                     if (!sub_descriptor) {

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

  769.                         continue;

  770.                     }

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

  772.                         descriptor = sub_descriptor;

  773.                         break;

  774.                     }

  775.                 }

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

  777.                 descriptor = source_package->descriptor;

  778.         }

  779.         if (!descriptor) {

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

  781.             continue;

  782.         }

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

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

  785.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  794.                     break;

  795.                 }

  796.             }

  797.         }

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

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

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

  801.         if (descriptor->extradata) {

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

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

  804.         }

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

  806.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

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

  813.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  815.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  821.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  833.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  834.             }

  835.         }

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

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

  838.             st->need_parsing = AVSTREAM_PARSE_FULL;

  839.         }

  840.     }

  841.     return 0;

  842. }

  843. 

  844. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  845.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  846.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  847.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  848.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  849.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  850.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  851.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  852.     { { 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 */

  853.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  854.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  855.     { { 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 */

  856.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  857.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  858.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  859.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  860.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  861.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  862.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  863. };

  864. 

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

  866. {

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

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

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

  870. 

  871.     if (!ctx)

  872.         return -1;

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

  874.         int tag = get_be16(pb);

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

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

  877.         UID uid = {0};

  878. 

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

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

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

  882.             continue;

  883.         }

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

  885.             int i;

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

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

  888.                 if (local_tag == tag) {

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

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

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

  892.                 }

  893.             }

  894.         }

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

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

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

  898.             return -1;

  899. 

  900.         url_fseek(pb, next, SEEK_SET);

  901.     }

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

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

  904. }

  905. 

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

  907. {

  908.     MXFContext *mxf = s->priv_data;

  909.     KLVPacket klv;

  910. 

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

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

  913.         return -1;

  914.     }

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

  916.     mxf->fc = s;

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

  918.         const MXFMetadataReadTableEntry *metadata;

  919. 

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

  921.             return -1;

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

  923.         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);

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

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

  926.             /* FIXME avoid seek */

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

  928.             break;

  929.         }

  930. 

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

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

  933.                 int res;

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

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

  936.                 } else

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

  938.                 if (res < 0) {

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

  940.                     return -1;

  941.                 }

  942.                 break;

  943.             }

  944.         }

  945.         if (!metadata->read)

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

  947.     }

  948.     return mxf_parse_structural_metadata(mxf);

  949. }

  950. 

  951. static int mxf_read_close(AVFormatContext *s)

  952. {

  953.     MXFContext *mxf = s->priv_data;

  954.     int i;

  955. 

  956.     av_freep(&mxf->packages_refs);

  957. 

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

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

  960. 

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

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

  963.         case MultipleDescriptor:

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

  965.             break;

  966.         case Sequence:

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

  968.             break;

  969.         case SourcePackage:

  970.         case MaterialPackage:

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

  972.             break;

  973.         default:

  974.             break;

  975.         }

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

  977.     }

  978.     av_freep(&mxf->metadata_sets);

  979.     av_freep(&mxf->aesc);

  980.     av_freep(&mxf->local_tags);

  981.     return 0;

  982. }

  983. 

  984. static int mxf_probe(AVProbeData *p) {

  985.     uint8_t *bufp = p->buf;

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

  987. 

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

  989.         return 0;

  990. 

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

  992.     end -= sizeof(mxf_header_partition_pack_key);

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

  994.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  995.             return AVPROBE_SCORE_MAX;

  996.     }

  997.     return 0;

  998. }

  999. 

  1000. /* rudimentary byte seek */

  1001. /* XXX: use MXF Index */

  1002. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1003. {

  1004.     AVStream *st = s->streams[stream_index];

  1005.     int64_t seconds;

  1006. 

  1007.     if (!s->bit_rate)

  1008.         return -1;

  1009.     if (sample_time < 0)

  1010.         sample_time = 0;

  1011.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1012.     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1013.     av_update_cur_dts(s, st, sample_time);

  1014.     return 0;

  1015. }

  1016. 

  1017. AVInputFormat mxf_demuxer = {

  1018.     "mxf",

  1019.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1020.     sizeof(MXFContext),

  1021.     mxf_probe,

  1022.     mxf_read_header,

  1023.     mxf_read_packet,

  1024.     mxf_read_close,

  1025.     mxf_read_seek,

  1026. };