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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 "mxf.h"

  53. 

  54. typedef struct {

  55.     UID uid;

  56.     enum MXFMetadataSetType type;

  57.     UID source_container_ul;

  58. } MXFCryptoContext;

  59. 

  60. typedef struct {

  61.     UID uid;

  62.     enum MXFMetadataSetType type;

  63.     UID source_package_uid;

  64.     UID data_definition_ul;

  65.     int64_t duration;

  66.     int64_t start_position;

  67.     int source_track_id;

  68. } MXFStructuralComponent;

  69. 

  70. typedef struct {

  71.     UID uid;

  72.     enum MXFMetadataSetType type;

  73.     UID data_definition_ul;

  74.     UID *structural_components_refs;

  75.     int structural_components_count;

  76.     int64_t duration;

  77. } MXFSequence;

  78. 

  79. typedef struct {

  80.     UID uid;

  81.     enum MXFMetadataSetType type;

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

  83.     UID sequence_ref;

  84.     int track_id;

  85.     uint8_t track_number[4];

  86.     AVRational edit_rate;

  87. } MXFTrack;

  88. 

  89. typedef struct {

  90.     UID uid;

  91.     enum MXFMetadataSetType type;

  92.     UID essence_container_ul;

  93.     UID essence_codec_ul;

  94.     AVRational sample_rate;

  95.     AVRational aspect_ratio;

  96.     int width;

  97.     int height;

  98.     int channels;

  99.     int bits_per_sample;

  100.     UID *sub_descriptors_refs;

  101.     int sub_descriptors_count;

  102.     int linked_track_id;

  103.     uint8_t *extradata;

  104.     int extradata_size;

  105.     enum PixelFormat pix_fmt;

  106. } MXFDescriptor;

  107. 

  108. typedef struct {

  109.     UID uid;

  110.     enum MXFMetadataSetType type;

  111. } MXFIndexTableSegment;

  112. 

  113. typedef struct {

  114.     UID uid;

  115.     enum MXFMetadataSetType type;

  116.     UID package_uid;

  117.     UID *tracks_refs;

  118.     int tracks_count;

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

  120.     UID descriptor_ref;

  121. } MXFPackage;

  122. 

  123. typedef struct {

  124.     UID uid;

  125.     enum MXFMetadataSetType type;

  126. } MXFMetadataSet;

  127. 

  128. typedef struct {

  129.     UID *packages_refs;

  130.     int packages_count;

  131.     MXFMetadataSet **metadata_sets;

  132.     int metadata_sets_count;

  133.     AVFormatContext *fc;

  134.     struct AVAES *aesc;

  135.     uint8_t *local_tags;

  136.     int local_tags_count;

  137. } MXFContext;

  138. 

  139. enum MXFWrappingScheme {

  140.     Frame,

  141.     Clip,

  142. };

  143. 

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

  145. 

  146. typedef struct {

  147.     const UID key;

  148.     MXFMetadataReadFunc *read;

  149.     int ctx_size;

  150.     enum MXFMetadataSetType type;

  151. } MXFMetadataReadTableEntry;

  152. 

  153. /* partial keys to match */

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

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

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

  157. /* complete keys to match */

  158. 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 };

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

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

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

  162. 

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

  164. 

  165. static int64_t klv_decode_ber_length(AVIOContext *pb)

  166. {

  167.     uint64_t size = avio_r8(pb);

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

  169.         int bytes_num = size & 0x7f;

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

  171.         if (bytes_num > 8)

  172.             return -1;

  173.         size = 0;

  174.         while (bytes_num--)

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

  176.     }

  177.     return size;

  178. }

  179. 

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

  181. {

  182.     int i, b;

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

  184.         b = avio_r8(pb);

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

  186.             i = 0;

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

  188.             i = -1;

  189.     }

  190.     return i == size;

  191. }

  192. 

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

  194. {

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

  196.         return -1;

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

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

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

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

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

  202. }

  203. 

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

  205. {

  206.     int i;

  207. 

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

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

  210.         /* SMPTE 379M 7.3 */

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

  212.             return i;

  213.     }

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

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

  216. }

  217. 

  218. /* XXX: use AVBitStreamFilter */

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

  220. {

  221.     const uint8_t *buf_ptr, *end_ptr;

  222.     uint8_t *data_ptr;

  223.     int i;

  224. 

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

  226.         return -1;

  227.     av_new_packet(pkt, length);

  228.     avio_read(pb, pkt->data, length);

  229.     data_ptr = pkt->data;

  230.     end_ptr = pkt->data + length;

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

  232.     for (; buf_ptr < end_ptr; ) {

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

  234.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  237.             else

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

  239.         }

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

  241.     }

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

  243.     return 0;

  244. }

  245. 

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

  247. {

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

  249.     MXFContext *mxf = s->priv_data;

  250.     AVIOContext *pb = s->pb;

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

  252.     uint64_t size;

  253.     uint64_t orig_size;

  254.     uint64_t plaintext_size;

  255.     uint8_t ivec[16];

  256.     uint8_t tmpbuf[16];

  257.     int index;

  258. 

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

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

  261.         if (!mxf->aesc)

  262.             return -1;

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

  264.     }

  265.     // crypto context

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

  267.     // plaintext offset

  268.     klv_decode_ber_length(pb);

  269.     plaintext_size = avio_rb64(pb);

  270.     // source klv key

  271.     klv_decode_ber_length(pb);

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

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

  274.         return -1;

  275.     index = mxf_get_stream_index(s, klv);

  276.     if (index < 0)

  277.         return -1;

  278.     // source size

  279.     klv_decode_ber_length(pb);

  280.     orig_size = avio_rb64(pb);

  281.     if (orig_size < plaintext_size)

  282.         return -1;

  283.     // enc. code

  284.     size = klv_decode_ber_length(pb);

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

  286.         return -1;

  287.     avio_read(pb, ivec, 16);

  288.     avio_read(pb, tmpbuf, 16);

  289.     if (mxf->aesc)

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

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

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

  293.     size -= 32;

  294.     av_get_packet(pb, pkt, size);

  295.     size -= plaintext_size;

  296.     if (mxf->aesc)

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

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

  299.     pkt->size = orig_size;

  300.     pkt->stream_index = index;

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

  302.     return 0;

  303. }

  304. 

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

  306. {

  307.     KLVPacket klv;

  308. 

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

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

  311.             return -1;

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

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

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

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

  316.             if (res < 0) {

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

  318.                 return -1;

  319.             }

  320.             return 0;

  321.         }

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

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

  324.             if (index < 0) {

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

  326.                 goto skip;

  327.             }

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

  329.                 goto skip;

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

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

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

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

  334.                     return -1;

  335.                 }

  336.             } else

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

  338.             pkt->stream_index = index;

  339.             pkt->pos = klv.offset;

  340.             return 0;

  341.         } else

  342.         skip:

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

  344.     }

  345.     return AVERROR_EOF;

  346. }

  347. 

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

  349. {

  350.     MXFContext *mxf = arg;

  351.     int item_num = avio_rb32(pb);

  352.     int item_len = avio_rb32(pb);

  353. 

  354.     if (item_len != 18) {

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

  356.         return -1;

  357.     }

  358.     if (item_num > UINT_MAX / item_len)

  359.         return -1;

  360.     mxf->local_tags_count = item_num;

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

  362.     if (!mxf->local_tags)

  363.         return -1;

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

  365.     return 0;

  366. }

  367. 

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

  369. {

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

  371.         return AVERROR(ENOMEM);

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

  373.     if (!mxf->metadata_sets)

  374.         return -1;

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

  376.     mxf->metadata_sets_count++;

  377.     return 0;

  378. }

  379. 

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

  381. {

  382.     MXFCryptoContext *cryptocontext = arg;

  383.     if (size != 16)

  384.         return -1;

  385.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  387.     return 0;

  388. }

  389. 

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

  391. {

  392.     MXFContext *mxf = arg;

  393.     switch (tag) {

  394.     case 0x1901:

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

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

  397.             return -1;

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

  399.         if (!mxf->packages_refs)

  400.             return -1;

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

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

  403.         break;

  404.     }

  405.     return 0;

  406. }

  407. 

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

  409. {

  410.     MXFStructuralComponent *source_clip = arg;

  411.     switch(tag) {

  412.     case 0x0202:

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

  414.         break;

  415.     case 0x1201:

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

  417.         break;

  418.     case 0x1101:

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

  420.         avio_skip(pb, 16);

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

  422.         break;

  423.     case 0x1102:

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

  425.         break;

  426.     }

  427.     return 0;

  428. }

  429. 

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

  431. {

  432.     MXFPackage *package = arg;

  433.     switch(tag) {

  434.     case 0x4403:

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

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

  437.             return -1;

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

  439.         if (!package->tracks_refs)

  440.             return -1;

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

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

  443.         break;

  444.     }

  445.     return 0;

  446. }

  447. 

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

  449. {

  450.     MXFTrack *track = arg;

  451.     switch(tag) {

  452.     case 0x4801:

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

  454.         break;

  455.     case 0x4804:

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

  457.         break;

  458.     case 0x4B01:

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

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

  461.         break;

  462.     case 0x4803:

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

  464.         break;

  465.     }

  466.     return 0;

  467. }

  468. 

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

  470. {

  471.     MXFSequence *sequence = arg;

  472.     switch(tag) {

  473.     case 0x0202:

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

  475.         break;

  476.     case 0x0201:

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

  478.         break;

  479.     case 0x1001:

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

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

  482.             return -1;

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

  484.         if (!sequence->structural_components_refs)

  485.             return -1;

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

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

  488.         break;

  489.     }

  490.     return 0;

  491. }

  492. 

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

  494. {

  495.     MXFPackage *package = arg;

  496.     switch(tag) {

  497.     case 0x4403:

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

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

  500.             return -1;

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

  502.         if (!package->tracks_refs)

  503.             return -1;

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

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

  506.         break;

  507.     case 0x4401:

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

  509.         avio_skip(pb, 16);

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

  511.         break;

  512.     case 0x4701:

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

  514.         break;

  515.     }

  516.     return 0;

  517. }

  518. 

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

  520. {

  521.     switch(tag) {

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

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

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

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

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

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

  528.     }

  529.     return 0;

  530. }

  531. 

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

  533. {

  534.     int code, value, ofs = 0;

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

  536. 

  537.     do {

  538.         code = avio_r8(pb);

  539.         value = avio_r8(pb);

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

  541. 

  542.         if (ofs < 16) {

  543.             layout[ofs++] = code;

  544.             layout[ofs++] = value;

  545.         }

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

  547. 

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

  549. }

  550. 

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

  552. {

  553.     MXFDescriptor *descriptor = arg;

  554.     switch(tag) {

  555.     case 0x3F01:

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

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

  558.             return -1;

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

  560.         if (!descriptor->sub_descriptors_refs)

  561.             return -1;

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

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

  564.         break;

  565.     case 0x3004:

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

  567.         break;

  568.     case 0x3006:

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

  570.         break;

  571.     case 0x3201: /* PictureEssenceCoding */

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

  573.         break;

  574.     case 0x3203:

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

  576.         break;

  577.     case 0x3202:

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

  579.         break;

  580.     case 0x320E:

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

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

  583.         break;

  584.     case 0x3D03:

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

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

  587.         break;

  588.     case 0x3D06: /* SoundEssenceCompression */

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

  590.         break;

  591.     case 0x3D07:

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

  593.         break;

  594.     case 0x3D01:

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

  596.         break;

  597.     case 0x3401:

  598.         mxf_read_pixel_layout(pb, descriptor);

  599.         break;

  600.     default:

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

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

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

  604.             if (!descriptor->extradata)

  605.                 return -1;

  606.             descriptor->extradata_size = size;

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

  608.         }

  609.         break;

  610.     }

  611.     return 0;

  612. }

  613. 

  614. /*

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

  616.  * Returns: boolean

  617.  */

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

  619. {

  620.     int i;

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

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

  623.             return 0;

  624.     }

  625.     return 1;

  626. }

  627. 

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

  629. {

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

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

  632.             break;

  633.         uls++;

  634.     }

  635.     return uls;

  636. }

  637. 

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

  639. {

  640.     int i;

  641. 

  642.     if (!strong_ref)

  643.         return NULL;

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

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

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

  647.             return mxf->metadata_sets[i];

  648.         }

  649.     }

  650.     return NULL;

  651. }

  652. 

  653. static const MXFCodecUL mxf_essence_container_uls[] = {

  654.     // video essence container uls

  655.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  656.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  657.     // sound essence container uls

  658.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  659.     { { 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 */

  660.     { { 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 */

  661.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  662. };

  663. 

  664. static int mxf_parse_structural_metadata(MXFContext *mxf)

  665. {

  666.     MXFPackage *material_package = NULL;

  667.     MXFPackage *temp_package = NULL;

  668.     int i, j, k;

  669. 

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

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

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

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

  674.         if (material_package) break;

  675.     }

  676.     if (!material_package) {

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

  678.         return -1;

  679.     }

  680. 

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

  682.         MXFPackage *source_package = NULL;

  683.         MXFTrack *material_track = NULL;

  684.         MXFTrack *source_track = NULL;

  685.         MXFTrack *temp_track = NULL;

  686.         MXFDescriptor *descriptor = NULL;

  687.         MXFStructuralComponent *component = NULL;

  688.         UID *essence_container_ul = NULL;

  689.         const MXFCodecUL *codec_ul = NULL;

  690.         const MXFCodecUL *container_ul = NULL;

  691.         AVStream *st;

  692. 

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

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

  695.             continue;

  696.         }

  697. 

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

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

  700.             continue;

  701.         }

  702. 

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

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

  705.             /* TODO: handle timecode component */

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

  707.             if (!component)

  708.                 continue;

  709. 

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

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

  712.                 if (!temp_package)

  713.                     continue;

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

  715.                     source_package = temp_package;

  716.                     break;

  717.                 }

  718.             }

  719.             if (!source_package) {

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

  721.                 break;

  722.             }

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

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

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

  726.                     return -1;

  727.                 }

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

  729.                     source_track = temp_track;

  730.                     break;

  731.                 }

  732.             }

  733.             if (!source_track) {

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

  735.                 break;

  736.             }

  737.         }

  738.         if (!source_track)

  739.             continue;

  740. 

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

  742.         if (!st) {

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

  744.             return -1;

  745.         }

  746.         st->priv_data = source_track;

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

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

  749.             st->duration = AV_NOPTS_VALUE;

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

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

  752. 

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

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

  755.             return -1;

  756.         }

  757. 

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

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

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

  761. 

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

  763.         if (source_package->descriptor) {

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

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

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

  767. 

  768.                     if (!sub_descriptor) {

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

  770.                         continue;

  771.                     }

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

  773.                         descriptor = sub_descriptor;

  774.                         break;

  775.                     }

  776.                 }

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

  778.                 descriptor = source_package->descriptor;

  779.         }

  780.         if (!descriptor) {

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

  782.             continue;

  783.         }

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

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

  786.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  795.                     break;

  796.                 }

  797.             }

  798.         }

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

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

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

  802.         if (descriptor->extradata) {

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

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

  805.         }

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

  807.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

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

  814.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  816.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  822.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

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

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

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

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

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

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

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

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

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

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

  834.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  835.             }

  836.         }

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

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

  839.             st->need_parsing = AVSTREAM_PARSE_FULL;

  840.         }

  841.     }

  842.     return 0;

  843. }

  844. 

  845. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  846.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  847.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  848.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  849.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  850.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  851.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  852.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  853.     { { 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 */

  854.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  855.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  856.     { { 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 */

  857.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  858.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  859.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  860.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  861.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  862.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  863.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  864. };

  865. 

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

  867. {

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

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

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

  871. 

  872.     if (!ctx)

  873.         return -1;

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

  875.         int tag = avio_rb16(pb);

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

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

  878.         UID uid = {0};

  879. 

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

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

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

  883.             continue;

  884.         }

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

  886.             int i;

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

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

  889.                 if (local_tag == tag) {

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

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

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

  893.                 }

  894.             }

  895.         }

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

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

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

  899.             return -1;

  900. 

  901.         avio_seek(pb, next, SEEK_SET);

  902.     }

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

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

  905. }

  906. 

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

  908. {

  909.     MXFContext *mxf = s->priv_data;

  910.     KLVPacket klv;

  911. 

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

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

  914.         return -1;

  915.     }

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

  917.     mxf->fc = s;

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

  919.         const MXFMetadataReadTableEntry *metadata;

  920. 

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

  922.             return -1;

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

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

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

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

  927.             /* FIXME avoid seek */

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

  929.             break;

  930.         }

  931. 

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

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

  934.                 int res;

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

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

  937.                 } else

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

  939.                 if (res < 0) {

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

  941.                     return -1;

  942.                 }

  943.                 break;

  944.             }

  945.         }

  946.         if (!metadata->read)

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

  948.     }

  949.     return mxf_parse_structural_metadata(mxf);

  950. }

  951. 

  952. static int mxf_read_close(AVFormatContext *s)

  953. {

  954.     MXFContext *mxf = s->priv_data;

  955.     int i;

  956. 

  957.     av_freep(&mxf->packages_refs);

  958. 

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

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

  961. 

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

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

  964.         case MultipleDescriptor:

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

  966.             break;

  967.         case Sequence:

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

  969.             break;

  970.         case SourcePackage:

  971.         case MaterialPackage:

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

  973.             break;

  974.         default:

  975.             break;

  976.         }

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

  978.     }

  979.     av_freep(&mxf->metadata_sets);

  980.     av_freep(&mxf->aesc);

  981.     av_freep(&mxf->local_tags);

  982.     return 0;

  983. }

  984. 

  985. static int mxf_probe(AVProbeData *p) {

  986.     uint8_t *bufp = p->buf;

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

  988. 

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

  990.         return 0;

  991. 

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

  993.     end -= sizeof(mxf_header_partition_pack_key);

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

  995.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  996.             return AVPROBE_SCORE_MAX;

  997.     }

  998.     return 0;

  999. }

  1000. 

  1001. /* rudimentary byte seek */

  1002. /* XXX: use MXF Index */

  1003. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1004. {

  1005.     AVStream *st = s->streams[stream_index];

  1006.     int64_t seconds;

  1007. 

  1008.     if (!s->bit_rate)

  1009.         return -1;

  1010.     if (sample_time < 0)

  1011.         sample_time = 0;

  1012.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1013.     avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1014.     av_update_cur_dts(s, st, sample_time);

  1015.     return 0;

  1016. }

  1017. 

  1018. AVInputFormat ff_mxf_demuxer = {

  1019.     "mxf",

  1020.     NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1021.     sizeof(MXFContext),

  1022.     mxf_probe,

  1023.     mxf_read_header,

  1024.     mxf_read_packet,

  1025.     mxf_read_close,

  1026.     mxf_read_seek,

  1027. };