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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

  3.  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /*

  23.  * References

  24.  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

  28.  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container

  29.  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container

  30.  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container

  31.  *

  32.  * Principle

  33.  * Search for Track numbers which will identify essence element KLV packets.

  34.  * Search for SourcePackage which define tracks which contains Track numbers.

  35.  * Material Package contains tracks with reference to SourcePackage tracks.

  36.  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.

  37.  * Assign Descriptors to correct Tracks.

  38.  *

  39.  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

  42.  * Simple demuxer, only OP1A supported and some files might not work at all.

  43.  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef struct {

  56.     UID uid;

  57.     enum MXFMetadataSetType type;

  58.     UID source_container_ul;

  59. } MXFCryptoContext;

  60. 

  61. typedef struct {

  62.     UID uid;

  63.     enum MXFMetadataSetType type;

  64.     UID source_package_uid;

  65.     UID data_definition_ul;

  66.     int64_t duration;

  67.     int64_t start_position;

  68.     int source_track_id;

  69. } MXFStructuralComponent;

  70. 

  71. typedef struct {

  72.     UID uid;

  73.     enum MXFMetadataSetType type;

  74.     UID data_definition_ul;

  75.     UID *structural_components_refs;

  76.     int structural_components_count;

  77.     int64_t duration;

  78. } MXFSequence;

  79. 

  80. typedef struct {

  81.     UID uid;

  82.     enum MXFMetadataSetType type;

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

  84.     UID sequence_ref;

  85.     int track_id;

  86.     uint8_t track_number[4];

  87.     AVRational edit_rate;

  88. } MXFTrack;

  89. 

  90. typedef struct {

  91.     UID uid;

  92.     enum MXFMetadataSetType type;

  93.     UID essence_container_ul;

  94.     UID essence_codec_ul;

  95.     AVRational sample_rate;

  96.     AVRational aspect_ratio;

  97.     int width;

  98.     int height;

  99.     int channels;

  100.     int bits_per_sample;

  101.     UID *sub_descriptors_refs;

  102.     int sub_descriptors_count;

  103.     int linked_track_id;

  104.     uint8_t *extradata;

  105.     int extradata_size;

  106.     enum PixelFormat pix_fmt;

  107. } MXFDescriptor;

  108. 

  109. typedef struct {

  110.     UID uid;

  111.     enum MXFMetadataSetType type;

  112. } MXFIndexTableSegment;

  113. 

  114. typedef struct {

  115.     UID uid;

  116.     enum MXFMetadataSetType type;

  117.     UID package_uid;

  118.     UID *tracks_refs;

  119.     int tracks_count;

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

  121.     UID descriptor_ref;

  122. } MXFPackage;

  123. 

  124. typedef struct {

  125.     UID uid;

  126.     enum MXFMetadataSetType type;

  127. } MXFMetadataSet;

  128. 

  129. typedef struct {

  130.     UID *packages_refs;

  131.     int packages_count;

  132.     MXFMetadataSet **metadata_sets;

  133.     int metadata_sets_count;

  134.     AVFormatContext *fc;

  135.     struct AVAES *aesc;

  136.     uint8_t *local_tags;

  137.     int local_tags_count;

  138. } MXFContext;

  139. 

  140. enum MXFWrappingScheme {

  141.     Frame,

  142.     Clip,

  143. };

  144. 

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

  146. 

  147. typedef struct {

  148.     const UID key;

  149.     MXFMetadataReadFunc *read;

  150.     int ctx_size;

  151.     enum MXFMetadataSetType type;

  152. } MXFMetadataReadTableEntry;

  153. 

  154. /* partial keys to match */

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

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

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

  158. /* complete keys to match */

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

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

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

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

  163. 

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

  165. 

  166. static int64_t klv_decode_ber_length(AVIOContext *pb)

  167. {

  168.     uint64_t size = avio_r8(pb);

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

  170.         int bytes_num = size & 0x7f;

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

  172.         if (bytes_num > 8)

  173.             return AVERROR_INVALIDDATA;

  174.         size = 0;

  175.         while (bytes_num--)

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

  177.     }

  178.     return size;

  179. }

  180. 

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

  182. {

  183.     int i, b;

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

  185.         b = avio_r8(pb);

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

  187.             i = 0;

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

  189.             i = -1;

  190.     }

  191.     return i == size;

  192. }

  193. 

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

  195. {

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

  197.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  203. }

  204. 

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

  206. {

  207.     int i;

  208. 

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

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

  211.         /* SMPTE 379M 7.3 */

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

  213.             return i;

  214.     }

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

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

  217. }

  218. 

  219. /* XXX: use AVBitStreamFilter */

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

  221. {

  222.     const uint8_t *buf_ptr, *end_ptr;

  223.     uint8_t *data_ptr;

  224.     int i;

  225. 

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

  227.         return AVERROR_INVALIDDATA;

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

  229.     if (length < 0)

  230.         return length;

  231.     data_ptr = pkt->data;

  232.     end_ptr = pkt->data + length;

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

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

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

  236.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  239.             else

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

  241.         }

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

  243.     }

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

  245.     return 0;

  246. }

  247. 

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

  249. {

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

  251.     MXFContext *mxf = s->priv_data;

  252.     AVIOContext *pb = s->pb;

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

  254.     int64_t size;

  255.     uint64_t orig_size;

  256.     uint64_t plaintext_size;

  257.     uint8_t ivec[16];

  258.     uint8_t tmpbuf[16];

  259.     int index;

  260. 

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

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

  263.         if (!mxf->aesc)

  264.             return AVERROR(ENOMEM);

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

  266.     }

  267.     // crypto context

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

  269.     // plaintext offset

  270.     klv_decode_ber_length(pb);

  271.     plaintext_size = avio_rb64(pb);

  272.     // source klv key

  273.     klv_decode_ber_length(pb);

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

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

  276.         return AVERROR_INVALIDDATA;

  277.     index = mxf_get_stream_index(s, klv);

  278.     if (index < 0)

  279.         return AVERROR_INVALIDDATA;

  280.     // source size

  281.     klv_decode_ber_length(pb);

  282.     orig_size = avio_rb64(pb);

  283.     if (orig_size < plaintext_size)

  284.         return AVERROR_INVALIDDATA;

  285.     // enc. code

  286.     size = klv_decode_ber_length(pb);

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

  288.         return AVERROR_INVALIDDATA;

  289.     avio_read(pb, ivec, 16);

  290.     avio_read(pb, tmpbuf, 16);

  291.     if (mxf->aesc)

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

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

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

  295.     size -= 32;

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

  297.     if (size < 0)

  298.         return size;

  299.     else if (size < plaintext_size)

  300.         return AVERROR_INVALIDDATA;

  301.     size -= plaintext_size;

  302.     if (mxf->aesc)

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

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

  305.     av_shrink_packet(pkt, orig_size);

  306.     pkt->stream_index = index;

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

  308.     return 0;

  309. }

  310. 

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

  312. {

  313.     KLVPacket klv;

  314. 

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

  316.         int ret;

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

  318.             return -1;

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

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

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

  322.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  323.             if (ret < 0) {

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

  325.                 return AVERROR_INVALIDDATA;

  326.             }

  327.             return 0;

  328.         }

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

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

  331.             if (index < 0) {

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

  333.                 goto skip;

  334.             }

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

  336.                 goto skip;

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

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

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

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

  341.                     return AVERROR_INVALIDDATA;

  342.                 }

  343.             } else {

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

  345.                 if (ret < 0)

  346.                     return ret;

  347.             }

  348.             pkt->stream_index = index;

  349.             pkt->pos = klv.offset;

  350.             return 0;

  351.         } else

  352.         skip:

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

  354.     }

  355.     return AVERROR_EOF;

  356. }

  357. 

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

  359. {

  360.     MXFContext *mxf = arg;

  361.     int item_num = avio_rb32(pb);

  362.     int item_len = avio_rb32(pb);

  363. 

  364.     if (item_len != 18) {

  365.         av_log_ask_for_sample(pb, "unsupported primer pack item length %d\n",

  366.                               item_len);

  367.         return AVERROR_PATCHWELCOME;

  368.     }

  369.     if (item_num > UINT_MAX / item_len)

  370.         return AVERROR_INVALIDDATA;

  371.     mxf->local_tags_count = item_num;

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

  373.     if (!mxf->local_tags)

  374.         return AVERROR(ENOMEM);

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

  376.     return 0;

  377. }

  378. 

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

  380. {

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

  382.         return AVERROR(ENOMEM);

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

  384.     if (!mxf->metadata_sets)

  385.         return AVERROR(ENOMEM);

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

  387.     mxf->metadata_sets_count++;

  388.     return 0;

  389. }

  390. 

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

  392. {

  393.     MXFCryptoContext *cryptocontext = arg;

  394.     if (size != 16)

  395.         return AVERROR_INVALIDDATA;

  396.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  398.     return 0;

  399. }

  400. 

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

  402. {

  403.     MXFContext *mxf = arg;

  404.     switch (tag) {

  405.     case 0x1901:

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

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

  408.             return AVERROR_INVALIDDATA;

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

  410.         if (!mxf->packages_refs)

  411.             return AVERROR(ENOMEM);

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

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

  414.         break;

  415.     }

  416.     return 0;

  417. }

  418. 

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

  420. {

  421.     MXFStructuralComponent *source_clip = arg;

  422.     switch(tag) {

  423.     case 0x0202:

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

  425.         break;

  426.     case 0x1201:

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

  428.         break;

  429.     case 0x1101:

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

  431.         avio_skip(pb, 16);

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

  433.         break;

  434.     case 0x1102:

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

  436.         break;

  437.     }

  438.     return 0;

  439. }

  440. 

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

  442. {

  443.     MXFPackage *package = arg;

  444.     switch(tag) {

  445.     case 0x4403:

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

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

  448.             return AVERROR_INVALIDDATA;

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

  450.         if (!package->tracks_refs)

  451.             return AVERROR(ENOMEM);

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

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

  454.         break;

  455.     }

  456.     return 0;

  457. }

  458. 

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

  460. {

  461.     MXFTrack *track = arg;

  462.     switch(tag) {

  463.     case 0x4801:

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

  465.         break;

  466.     case 0x4804:

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

  468.         break;

  469.     case 0x4B01:

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

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

  472.         break;

  473.     case 0x4803:

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

  475.         break;

  476.     }

  477.     return 0;

  478. }

  479. 

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

  481. {

  482.     MXFSequence *sequence = arg;

  483.     switch(tag) {

  484.     case 0x0202:

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

  486.         break;

  487.     case 0x0201:

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

  489.         break;

  490.     case 0x1001:

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

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

  493.             return AVERROR_INVALIDDATA;

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

  495.         if (!sequence->structural_components_refs)

  496.             return AVERROR(ENOMEM);

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

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

  499.         break;

  500.     }

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     MXFPackage *package = arg;

  507.     switch(tag) {

  508.     case 0x4403:

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

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

  511.             return AVERROR_INVALIDDATA;

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

  513.         if (!package->tracks_refs)

  514.             return AVERROR(ENOMEM);

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

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

  517.         break;

  518.     case 0x4401:

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

  520.         avio_skip(pb, 16);

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

  522.         break;

  523.     case 0x4701:

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

  525.         break;

  526.     }

  527.     return 0;

  528. }

  529. 

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

  531. {

  532.     switch(tag) {

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

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

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

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

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

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

  539.     }

  540.     return 0;

  541. }

  542. 

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

  544. {

  545.     int code, value, ofs = 0;

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

  547. 

  548.     do {

  549.         code = avio_r8(pb);

  550.         value = avio_r8(pb);

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

  552. 

  553.         if (ofs < 16) {

  554.             layout[ofs++] = code;

  555.             layout[ofs++] = value;

  556.         }

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

  558. 

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

  560. }

  561. 

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

  563. {

  564.     MXFDescriptor *descriptor = arg;

  565.     switch(tag) {

  566.     case 0x3F01:

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

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

  569.             return AVERROR_INVALIDDATA;

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

  571.         if (!descriptor->sub_descriptors_refs)

  572.             return AVERROR(ENOMEM);

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

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

  575.         break;

  576.     case 0x3004:

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

  578.         break;

  579.     case 0x3006:

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

  581.         break;

  582.     case 0x3201: /* PictureEssenceCoding */

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

  584.         break;

  585.     case 0x3203:

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

  587.         break;

  588.     case 0x3202:

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

  590.         break;

  591.     case 0x320E:

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

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

  594.         break;

  595.     case 0x3D03:

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

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

  598.         break;

  599.     case 0x3D06: /* SoundEssenceCompression */

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

  601.         break;

  602.     case 0x3D07:

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

  604.         break;

  605.     case 0x3D01:

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

  607.         break;

  608.     case 0x3401:

  609.         mxf_read_pixel_layout(pb, descriptor);

  610.         break;

  611.     default:

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

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

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

  615.             if (!descriptor->extradata)

  616.                 return AVERROR(ENOMEM);

  617.             descriptor->extradata_size = size;

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

  619.         }

  620.         break;

  621.     }

  622.     return 0;

  623. }

  624. 

  625. /*

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

  627.  * Returns: boolean

  628.  */

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

  630. {

  631.     int i;

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

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

  634.             return 0;

  635.     }

  636.     return 1;

  637. }

  638. 

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

  640. {

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

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

  643.             break;

  644.         uls++;

  645.     }

  646.     return uls;

  647. }

  648. 

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

  650. {

  651.     int i;

  652. 

  653.     if (!strong_ref)

  654.         return NULL;

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

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

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

  658.             return mxf->metadata_sets[i];

  659.         }

  660.     }

  661.     return NULL;

  662. }

  663. 

  664. static const MXFCodecUL mxf_essence_container_uls[] = {

  665.     // video essence container uls

  666.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  667.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  668.     // sound essence container uls

  669.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  670.     { { 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 */

  671.     { { 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 */

  672.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  673. };

  674. 

  675. static int mxf_parse_structural_metadata(MXFContext *mxf)

  676. {

  677.     MXFPackage *material_package = NULL;

  678.     MXFPackage *temp_package = NULL;

  679.     int i, j, k;

  680. 

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

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

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

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

  685.         if (material_package) break;

  686.     }

  687.     if (!material_package) {

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

  689.         return AVERROR_INVALIDDATA;

  690.     }

  691. 

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

  693.         MXFPackage *source_package = NULL;

  694.         MXFTrack *material_track = NULL;

  695.         MXFTrack *source_track = NULL;

  696.         MXFTrack *temp_track = NULL;

  697.         MXFDescriptor *descriptor = NULL;

  698.         MXFStructuralComponent *component = NULL;

  699.         UID *essence_container_ul = NULL;

  700.         const MXFCodecUL *codec_ul = NULL;

  701.         const MXFCodecUL *container_ul = NULL;

  702.         AVStream *st;

  703. 

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

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

  706.             continue;

  707.         }

  708. 

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

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

  711.             continue;

  712.         }

  713. 

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

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

  716.             /* TODO: handle timecode component */

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

  718.             if (!component)

  719.                 continue;

  720. 

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

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

  723.                 if (!temp_package)

  724.                     continue;

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

  726.                     source_package = temp_package;

  727.                     break;

  728.                 }

  729.             }

  730.             if (!source_package) {

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

  732.                 break;

  733.             }

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

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

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

  737.                     return AVERROR_INVALIDDATA;

  738.                 }

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

  740.                     source_track = temp_track;

  741.                     break;

  742.                 }

  743.             }

  744.             if (!source_track) {

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

  746.                 break;

  747.             }

  748.         }

  749.         if (!source_track)

  750.             continue;

  751. 

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

  753.         if (!st) {

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

  755.             return AVERROR(ENOMEM);

  756.         }

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

  758.         st->priv_data = source_track;

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

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

  761.             st->duration = AV_NOPTS_VALUE;

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

  763.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  764. 

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

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

  767.             return AVERROR_INVALIDDATA;

  768.         }

  769. 

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

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

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

  773. 

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

  775.         if (source_package->descriptor) {

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

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

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

  779. 

  780.                     if (!sub_descriptor) {

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

  782.                         continue;

  783.                     }

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

  785.                         descriptor = sub_descriptor;

  786.                         break;

  787.                     }

  788.                 }

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

  790.                 descriptor = source_package->descriptor;

  791.         }

  792.         if (!descriptor) {

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

  794.             continue;

  795.         }

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

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

  798.         essence_container_ul = &descriptor->essence_container_ul;

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

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

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

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

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

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

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

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

  807.                     break;

  808.                 }

  809.             }

  810.         }

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

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

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

  814.         if (descriptor->extradata) {

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

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

  817.         }

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

  819.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

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

  826.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

  828.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

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

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

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

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

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

  834.             /* TODO: implement CODEC_ID_RAWAUDIO */

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

  836.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

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

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

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

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

  841.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

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

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

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

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

  846.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  847.             }

  848.         }

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

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

  851.             st->need_parsing = AVSTREAM_PARSE_FULL;

  852.         }

  853.     }

  854.     return 0;

  855. }

  856. 

  857. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  858.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  859.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  860.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  861.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  862.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  863.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  864.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  865.     { { 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 */

  866.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  867.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  868.     { { 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 */

  869.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  870.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  871.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  872.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  873.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  874.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  875.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  876. };

  877. 

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

  879. {

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

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

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

  883. 

  884.     if (!ctx)

  885.         return AVERROR(ENOMEM);

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

  887.         int ret;

  888.         int tag = avio_rb16(pb);

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

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

  891.         UID uid = {0};

  892. 

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

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

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

  896.             continue;

  897.         }

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

  899.             int i;

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

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

  902.                 if (local_tag == tag) {

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

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

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

  906.                 }

  907.             }

  908.         }

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

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

  911.         else if ((ret = read_child(ctx, pb, tag, size, uid)) < 0)

  912.             return ret;

  913. 

  914.         avio_seek(pb, next, SEEK_SET);

  915.     }

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

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

  918. }

  919. 

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

  921. {

  922.     MXFContext *mxf = s->priv_data;

  923.     KLVPacket klv;

  924. 

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

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

  927.         return AVERROR_INVALIDDATA;

  928.     }

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

  930.     mxf->fc = s;

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

  932.         int ret;

  933.         const MXFMetadataReadTableEntry *metadata;

  934. 

  935.         if ((ret = klv_read_packet(&klv, s->pb)) < 0)

  936.             return ret;

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

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

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

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

  941.             /* FIXME avoid seek */

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

  943.             break;

  944.         }

  945. 

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

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

  948.                 int res;

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

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

  951.                 } else

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

  953.                 if (res < 0) {

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

  955.                     return res;

  956.                 }

  957.                 break;

  958.             }

  959.         }

  960.         if (!metadata->read)

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

  962.     }

  963.     return mxf_parse_structural_metadata(mxf);

  964. }

  965. 

  966. static int mxf_read_close(AVFormatContext *s)

  967. {

  968.     MXFContext *mxf = s->priv_data;

  969.     int i;

  970. 

  971.     av_freep(&mxf->packages_refs);

  972. 

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

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

  975. 

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

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

  978.         case MultipleDescriptor:

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

  980.             break;

  981.         case Sequence:

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

  983.             break;

  984.         case SourcePackage:

  985.         case MaterialPackage:

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

  987.             break;

  988.         default:

  989.             break;

  990.         }

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

  992.     }

  993.     av_freep(&mxf->metadata_sets);

  994.     av_freep(&mxf->aesc);

  995.     av_freep(&mxf->local_tags);

  996.     return 0;

  997. }

  998. 

  999. static int mxf_probe(AVProbeData *p) {

  1000.     uint8_t *bufp = p->buf;

  1001.     uint8_t *end = p->buf + p->buf_size;

  1002. 

  1003.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1004.         return 0;

  1005. 

  1006.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1007.     end -= sizeof(mxf_header_partition_pack_key);

  1008.     for (; bufp < end; bufp++) {

  1009.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1010.             return AVPROBE_SCORE_MAX;

  1011.     }

  1012.     return 0;

  1013. }

  1014. 

  1015. /* rudimentary byte seek */

  1016. /* XXX: use MXF Index */

  1017. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1018. {

  1019.     AVStream *st = s->streams[stream_index];

  1020.     int64_t seconds;

  1021. 

  1022.     if (!s->bit_rate)

  1023.         return AVERROR_INVALIDDATA;

  1024.     if (sample_time < 0)

  1025.         sample_time = 0;

  1026.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1027.     avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  1028.     ff_update_cur_dts(s, st, sample_time);

  1029.     return 0;

  1030. }

  1031. 

  1032. AVInputFormat ff_mxf_demuxer = {

  1033.     .name           = "mxf",

  1034.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1035.     .priv_data_size = sizeof(MXFContext),

  1036.     .read_probe     = mxf_probe,

  1037.     .read_header    = mxf_read_header,

  1038.     .read_packet    = mxf_read_packet,

  1039.     .read_close     = mxf_read_close,

  1040.     .read_seek      = mxf_read_seek,

  1041. };