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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

  72.     OPSONYOpt,  /* FATE sample, violates the spec in places */

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

  83.     int64_t essence_offset;         /* absolute offset of essence */

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124. } MXFTrack;

  125. 

  126. typedef struct {

  127.     UID uid;

  128.     enum MXFMetadataSetType type;

  129.     UID essence_container_ul;

  130.     UID essence_codec_ul;

  131.     AVRational sample_rate;

  132.     AVRational aspect_ratio;

  133.     int width;

  134.     int height;

  135.     int channels;

  136.     int bits_per_sample;

  137.     UID *sub_descriptors_refs;

  138.     int sub_descriptors_count;

  139.     int linked_track_id;

  140.     uint8_t *extradata;

  141.     int extradata_size;

  142.     enum PixelFormat pix_fmt;

  143. } MXFDescriptor;

  144. 

  145. typedef struct {

  146.     UID uid;

  147.     enum MXFMetadataSetType type;

  148.     int edit_unit_byte_count;

  149.     int index_sid;

  150.     int body_sid;

  151.     int slice_count;

  152.     AVRational index_edit_rate;

  153.     uint64_t index_start_position;

  154.     uint64_t index_duration;

  155.     int *slice;

  156.     int *element_delta;

  157.     int nb_delta_entries;

  158.     int8_t *temporal_offset_entries;

  159.     int *flag_entries;

  160.     uint64_t *stream_offset_entries;

  161.     uint32_t **slice_offset_entries;

  162.     int nb_index_entries;

  163. } MXFIndexTableSegment;

  164. 

  165. typedef struct {

  166.     UID uid;

  167.     enum MXFMetadataSetType type;

  168.     UID package_uid;

  169.     UID *tracks_refs;

  170.     int tracks_count;

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

  172.     UID descriptor_ref;

  173. } MXFPackage;

  174. 

  175. typedef struct {

  176.     UID uid;

  177.     enum MXFMetadataSetType type;

  178. } MXFMetadataSet;

  179. 

  180. typedef struct {

  181.     MXFPartition *partitions;

  182.     unsigned partitions_count;

  183.     MXFOP op;

  184.     UID *packages_refs;

  185.     int packages_count;

  186.     MXFMetadataSet **metadata_sets;

  187.     int metadata_sets_count;

  188.     AVFormatContext *fc;

  189.     struct AVAES *aesc;

  190.     uint8_t *local_tags;

  191.     int local_tags_count;

  192.     uint64_t footer_partition;

  193.     KLVPacket current_klv_data;

  194.     int current_klv_index;

  195.     int run_in;

  196.     MXFPartition *current_partition;

  197.     int parsing_backward;

  198.     int64_t last_forward_tell;

  199.     int last_forward_partition;

  200.     int current_edit_unit;

  201.     int current_stream;

  202.     int d10;

  203. } MXFContext;

  204. 

  205. enum MXFWrappingScheme {

  206.     Frame,

  207.     Clip,

  208. };

  209. 

  210. /* NOTE: klv_offset is not set (-1) for local keys */

  211. typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset);

  212. 

  213. typedef struct {

  214.     const UID key;

  215.     MXFMetadataReadFunc *read;

  216.     int ctx_size;

  217.     enum MXFMetadataSetType type;

  218. } MXFMetadataReadTableEntry;

  219. 

  220. /* partial keys to match */

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

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

  223. static const uint8_t mxf_system_item_key[]                 = { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0D,0x01,0x03,0x01,0x04 };

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

  225. /* complete keys to match */

  226. 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 };

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

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

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

  230. 

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

  232. 

  233. static int64_t klv_decode_ber_length(AVIOContext *pb)

  234. {

  235.     uint64_t size = avio_r8(pb);

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

  237.         int bytes_num = size & 0x7f;

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

  239.         if (bytes_num > 8)

  240.             return -1;

  241.         size = 0;

  242.         while (bytes_num--)

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

  244.     }

  245.     return size;

  246. }

  247. 

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

  249. {

  250.     int i, b;

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

  252.         b = avio_r8(pb);

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

  254.             i = 0;

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

  256.             i = -1;

  257.     }

  258.     return i == size;

  259. }

  260. 

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

  262. {

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

  264.         return -1;

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

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

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

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

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

  270. }

  271. 

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

  273. {

  274.     int i;

  275. 

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

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

  278.         /* SMPTE 379M 7.3 */

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

  280.             return i;

  281.     }

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

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

  284. }

  285. 

  286. /* XXX: use AVBitStreamFilter */

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

  288. {

  289.     const uint8_t *buf_ptr, *end_ptr;

  290.     uint8_t *data_ptr;

  291.     int i;

  292. 

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

  294.         return -1;

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

  296.     if (length < 0)

  297.         return length;

  298.     data_ptr = pkt->data;

  299.     end_ptr = pkt->data + length;

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

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

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

  303.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  306.             else

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

  308.         }

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

  310.     }

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

  312.     return 0;

  313. }

  314. 

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

  316. {

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

  318.     MXFContext *mxf = s->priv_data;

  319.     AVIOContext *pb = s->pb;

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

  321.     int64_t size;

  322.     uint64_t orig_size;

  323.     uint64_t plaintext_size;

  324.     uint8_t ivec[16];

  325.     uint8_t tmpbuf[16];

  326.     int index;

  327. 

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

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

  330.         if (!mxf->aesc)

  331.             return -1;

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

  333.     }

  334.     // crypto context

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

  336.     // plaintext offset

  337.     klv_decode_ber_length(pb);

  338.     plaintext_size = avio_rb64(pb);

  339.     // source klv key

  340.     klv_decode_ber_length(pb);

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

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

  343.         return -1;

  344.     index = mxf_get_stream_index(s, klv);

  345.     if (index < 0)

  346.         return -1;

  347.     // source size

  348.     klv_decode_ber_length(pb);

  349.     orig_size = avio_rb64(pb);

  350.     if (orig_size < plaintext_size)

  351.         return -1;

  352.     // enc. code

  353.     size = klv_decode_ber_length(pb);

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

  355.         return -1;

  356.     avio_read(pb, ivec, 16);

  357.     avio_read(pb, tmpbuf, 16);

  358.     if (mxf->aesc)

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

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

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

  362.     size -= 32;

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

  364.     if (size < 0)

  365.         return size;

  366.     else if (size < plaintext_size)

  367.         return AVERROR_INVALIDDATA;

  368.     size -= plaintext_size;

  369.     if (mxf->aesc)

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

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

  372.     av_shrink_packet(pkt, orig_size);

  373.     pkt->stream_index = index;

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

  375.     return 0;

  376. }

  377. 

  378. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  379. {

  380.     KLVPacket klv;

  381. 

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

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

  384.             return -1;

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

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

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

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

  389.             if (res < 0) {

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

  391.                 return -1;

  392.             }

  393.             return 0;

  394.         }

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

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

  397.             if (index < 0) {

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

  399.                 goto skip;

  400.             }

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

  402.                 goto skip;

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

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

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

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

  407.                     return -1;

  408.                 }

  409.             } else {

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

  411.                 if (ret < 0)

  412.                     return ret;

  413.             }

  414.             pkt->stream_index = index;

  415.             pkt->pos = klv.offset;

  416.             return 0;

  417.         } else

  418.         skip:

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

  420.     }

  421.     return AVERROR_EOF;

  422. }

  423. 

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

  425. {

  426.     MXFContext *mxf = s->priv_data;

  427.     AVIndexEntry *e;

  428.     int ret;

  429.     int64_t ret64;

  430.     KLVPacket klv;

  431.     AVStream *st;

  432. 

  433.     /* TODO: better logic for this?

  434.      * only files that lack all index segments prior to the essence need this */

  435.     if (!s->pb->seekable && mxf->op != OPAtom || mxf->d10)

  436.         return mxf_read_packet_old(s, pkt);

  437. 

  438.     if (mxf->current_stream >= s->nb_streams) {

  439.         mxf->current_edit_unit++;

  440.         mxf->current_stream = 0;

  441.     }

  442. 

  443.     st = s->streams[mxf->current_stream];

  444. 

  445.     if (mxf->current_edit_unit >= st->nb_index_entries)

  446.         return AVERROR_EOF;

  447. 

  448.     e = &st->index_entries[mxf->current_edit_unit];

  449. 

  450.     if ((ret64 = avio_seek(s->pb, e->pos, SEEK_SET)) < 0)

  451.         return ret64;

  452. 

  453.     if (mxf->op == OPAtom) {

  454.         /* OPAtom - no KL, just essence */

  455.         if ((ret = av_get_packet(s->pb, pkt, e->size)) != e->size)

  456.             return ret < 0 ? ret : AVERROR_EOF;

  457.     } else {

  458.         /* read KL, read L bytes of essence */

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

  460.             return ret;

  461. 

  462.         /* untested, but looks OK */

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

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

  465.             if (res < 0) {

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

  467.                 return -1;

  468.             }

  469.             return 0;

  470.         }

  471. 

  472.         if ((ret = av_get_packet(s->pb, pkt, klv.length)) != klv.length)

  473.             return ret < 0 ? ret : AVERROR_EOF;

  474. 

  475.         pkt->pos = e->pos;

  476.     }

  477. 

  478.     pkt->stream_index = mxf->current_stream++;

  479. 

  480.     return 0;

  481. }

  482. 

  483. static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  484. {

  485.     MXFContext *mxf = arg;

  486.     int item_num = avio_rb32(pb);

  487.     int item_len = avio_rb32(pb);

  488. 

  489.     if (item_len != 18) {

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

  491.         return -1;

  492.     }

  493.     if (item_num > UINT_MAX / item_len)

  494.         return -1;

  495.     mxf->local_tags_count = item_num;

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

  497.     if (!mxf->local_tags)

  498.         return -1;

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

  500.     return 0;

  501. }

  502. 

  503. static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  504. {

  505.     MXFContext *mxf = arg;

  506.     MXFPartition *partition;

  507.     UID op;

  508.     uint64_t footer_partition;

  509. 

  510.     if (mxf->partitions_count+1 >= UINT_MAX / sizeof(*mxf->partitions))

  511.         return AVERROR(ENOMEM);

  512. 

  513.     mxf->partitions = av_realloc(mxf->partitions, (mxf->partitions_count + 1) * sizeof(*mxf->partitions));

  514.     if (!mxf->partitions)

  515.         return AVERROR(ENOMEM);

  516. 

  517.     if (mxf->parsing_backward) {

  518.         /* insert the new partition pack in the middle

  519.          * this makes the entries in mxf->partitions sorted by offset */

  520.         memmove(&mxf->partitions[mxf->last_forward_partition+1],

  521.                 &mxf->partitions[mxf->last_forward_partition],

  522.                 (mxf->partitions_count - mxf->last_forward_partition)*sizeof(*mxf->partitions));

  523.         partition = mxf->current_partition = &mxf->partitions[mxf->last_forward_partition];

  524.     } else {

  525.         mxf->last_forward_partition++;

  526.         partition = mxf->current_partition = &mxf->partitions[mxf->partitions_count];

  527.     }

  528. 

  529.     memset(partition, 0, sizeof(*partition));

  530.     mxf->partitions_count++;

  531.     partition->pack_length = avio_tell(pb) - klv_offset + size;

  532. 

  533.     switch(uid[13]) {

  534.     case 2:

  535.         partition->type = Header;

  536.         break;

  537.     case 3:

  538.         partition->type = BodyPartition;

  539.         break;

  540.     case 4:

  541.         partition->type = Footer;

  542.         break;

  543.     default:

  544.         av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);

  545.         return AVERROR_INVALIDDATA;

  546.     }

  547. 

  548.     /* consider both footers to be closed (there is only Footer and CompleteFooter) */

  549.     partition->closed = partition->type == Footer || !(uid[14] & 1);

  550.     partition->complete = uid[14] > 2;

  551.     avio_skip(pb, 4);

  552.     partition->kag_size = avio_rb32(pb);

  553.     partition->this_partition = avio_rb64(pb);

  554.     partition->previous_partition = avio_rb64(pb);

  555.     footer_partition = avio_rb64(pb);

  556.     partition->header_byte_count = avio_rb64(pb);

  557.     partition->index_byte_count = avio_rb64(pb);

  558.     partition->index_sid = avio_rb32(pb);

  559.     avio_skip(pb, 8);

  560.     partition->body_sid = avio_rb32(pb);

  561.     avio_read(pb, op, sizeof(UID));

  562. 

  563.     /* some files don'thave FooterPartition set in every partition */

  564.     if (footer_partition) {

  565.         if (mxf->footer_partition && mxf->footer_partition != footer_partition) {

  566.             av_log(mxf->fc, AV_LOG_ERROR, "inconsistent FooterPartition value: %li != %li\n",

  567.                    mxf->footer_partition, footer_partition);

  568.         } else {

  569.             mxf->footer_partition = footer_partition;

  570.         }

  571.     }

  572. 

  573.     av_dlog(mxf->fc, "PartitionPack: ThisPartition = 0x%lx, PreviousPartition = 0x%lx, "

  574.             "FooterPartition = 0x%lx, IndexSID = %i, BodySID = %i\n",

  575.             partition->this_partition,

  576.             partition->previous_partition, footer_partition,

  577.             partition->index_sid, partition->body_sid);

  578. 

  579.     if      (op[12] == 1 && op[13] == 1) mxf->op = OP1a;

  580.     else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;

  581.     else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;

  582.     else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;

  583.     else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;

  584.     else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;

  585.     else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;

  586.     else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;

  587.     else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;

  588.     else if (op[12] == 0x10)             mxf->op = OPAtom;

  589.     else if (op[12] == 64&& op[13] == 1) mxf->op = OPSONYOpt;

  590.     else {

  591.         av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh - guessing OP1a\n", op[12], op[13]);

  592.         mxf->op = OP1a;

  593.     }

  594. 

  595.     if (partition->kag_size <= 0 || partition->kag_size > (1 << 20)) {

  596.         av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %i - guessing ", partition->kag_size);

  597. 

  598.         if (mxf->op == OPSONYOpt)

  599.             partition->kag_size = 512;

  600.         else

  601.             partition->kag_size = 1;

  602. 

  603.         av_log(mxf->fc, AV_LOG_WARNING, "%i\n", partition->kag_size);

  604.     }

  605. 

  606.     return 0;

  607. }

  608. 

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

  610. {

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

  612.         return AVERROR(ENOMEM);

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

  614.     if (!mxf->metadata_sets)

  615.         return -1;

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

  617.     mxf->metadata_sets_count++;

  618.     return 0;

  619. }

  620. 

  621. static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  622. {

  623.     MXFCryptoContext *cryptocontext = arg;

  624.     if (size != 16)

  625.         return -1;

  626.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  628.     return 0;

  629. }

  630. 

  631. static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  632. {

  633.     MXFContext *mxf = arg;

  634.     switch (tag) {

  635.     case 0x1901:

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

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

  638.             return -1;

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

  640.         if (!mxf->packages_refs)

  641.             return -1;

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

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

  644.         break;

  645.     }

  646.     return 0;

  647. }

  648. 

  649. static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  650. {

  651.     MXFStructuralComponent *source_clip = arg;

  652.     switch(tag) {

  653.     case 0x0202:

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

  655.         break;

  656.     case 0x1201:

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

  658.         break;

  659.     case 0x1101:

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

  661.         avio_skip(pb, 16);

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

  663.         break;

  664.     case 0x1102:

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

  666.         break;

  667.     }

  668.     return 0;

  669. }

  670. 

  671. static int mxf_read_material_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  672. {

  673.     MXFPackage *package = arg;

  674.     switch(tag) {

  675.     case 0x4403:

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

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

  678.             return -1;

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

  680.         if (!package->tracks_refs)

  681.             return -1;

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

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

  684.         break;

  685.     }

  686.     return 0;

  687. }

  688. 

  689. static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  690. {

  691.     MXFTrack *track = arg;

  692.     switch(tag) {

  693.     case 0x4801:

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

  695.         break;

  696.     case 0x4804:

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

  698.         break;

  699.     case 0x4B01:

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

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

  702.         break;

  703.     case 0x4803:

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

  705.         break;

  706.     }

  707.     return 0;

  708. }

  709. 

  710. static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  711. {

  712.     MXFSequence *sequence = arg;

  713.     switch(tag) {

  714.     case 0x0202:

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

  716.         break;

  717.     case 0x0201:

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

  719.         break;

  720.     case 0x1001:

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

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

  723.             return -1;

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

  725.         if (!sequence->structural_components_refs)

  726.             return -1;

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

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

  729.         break;

  730.     }

  731.     return 0;

  732. }

  733. 

  734. static int mxf_read_source_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  735. {

  736.     MXFPackage *package = arg;

  737.     switch(tag) {

  738.     case 0x4403:

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

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

  741.             return -1;

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

  743.         if (!package->tracks_refs)

  744.             return -1;

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

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

  747.         break;

  748.     case 0x4401:

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

  750.         avio_skip(pb, 16);

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

  752.         break;

  753.     case 0x4701:

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

  755.         break;

  756.     }

  757.     return 0;

  758. }

  759. 

  760. static int mxf_read_delta_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)

  761. {

  762.     int i, length;

  763. 

  764.     segment->nb_delta_entries = avio_rb32(pb);

  765.     length = avio_rb32(pb);

  766. 

  767.     if (!(segment->slice         = av_calloc(segment->nb_delta_entries, sizeof(*segment->slice))) ||

  768.         !(segment->element_delta = av_calloc(segment->nb_delta_entries, sizeof(*segment->element_delta))))

  769.         return AVERROR(ENOMEM);

  770. 

  771.     for (i = 0; i < segment->nb_delta_entries; i++) {

  772.         avio_r8(pb);    /* PosTableIndex */

  773.         segment->slice[i] = avio_r8(pb);

  774.         segment->element_delta[i] = avio_rb32(pb);

  775.     }

  776.     return 0;

  777. }

  778. 

  779. static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)

  780. {

  781.     int i, j, length;

  782. 

  783.     segment->nb_index_entries = avio_rb32(pb);

  784.     length = avio_rb32(pb);

  785. 

  786.     if (!(segment->temporal_offset_entries=av_calloc(segment->nb_index_entries, sizeof(*segment->temporal_offset_entries))) ||

  787.         !(segment->flag_entries          = av_calloc(segment->nb_index_entries, sizeof(*segment->flag_entries))) ||

  788.         !(segment->stream_offset_entries = av_calloc(segment->nb_index_entries, sizeof(*segment->stream_offset_entries))))

  789.         return AVERROR(ENOMEM);

  790. 

  791.     if (segment->slice_count &&

  792.         !(segment->slice_offset_entries  = av_calloc(segment->nb_index_entries, sizeof(*segment->slice_offset_entries))))

  793.         return AVERROR(ENOMEM);

  794. 

  795.     for (i = 0; i < segment->nb_index_entries; i++) {

  796.         segment->temporal_offset_entries[i] = avio_r8(pb);

  797.         avio_r8(pb);                                        /* KeyFrameOffset */

  798.         segment->flag_entries[i] = avio_r8(pb);

  799.         segment->stream_offset_entries[i] = avio_rb64(pb);

  800.         if (segment->slice_count) {

  801.             if (!(segment->slice_offset_entries[i] = av_calloc(segment->slice_count, sizeof(**segment->slice_offset_entries))))

  802.                 return AVERROR(ENOMEM);

  803. 

  804.             for (j = 0; j < segment->slice_count; j++)

  805.                 segment->slice_offset_entries[i][j] = avio_rb32(pb);

  806.         }

  807. 

  808.         avio_skip(pb, length - 11 - 4 * segment->slice_count);

  809.     }

  810.     return 0;

  811. }

  812. 

  813. static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  814. {

  815.     MXFIndexTableSegment *segment = arg;

  816.     switch(tag) {

  817.     case 0x3F05:

  818.         segment->edit_unit_byte_count = avio_rb32(pb);

  819.         av_dlog(NULL, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);

  820.         break;

  821.     case 0x3F06:

  822.         segment->index_sid = avio_rb32(pb);

  823.         av_dlog(NULL, "IndexSID %d\n", segment->index_sid);

  824.         break;

  825.     case 0x3F07:

  826.         segment->body_sid = avio_rb32(pb);

  827.         av_dlog(NULL, "BodySID %d\n", segment->body_sid);

  828.         break;

  829.     case 0x3F08:

  830.         segment->slice_count = avio_r8(pb);

  831.         av_dlog(NULL, "SliceCount %d\n", segment->slice_count);

  832.         break;

  833.     case 0x3F09:

  834.         av_dlog(NULL, "DeltaEntryArray found\n");

  835.         return mxf_read_delta_entry_array(pb, segment);

  836.     case 0x3F0A:

  837.         av_dlog(NULL, "IndexEntryArray found\n");

  838.         return mxf_read_index_entry_array(pb, segment);

  839.     case 0x3F0B:

  840.         segment->index_edit_rate.num = avio_rb32(pb);

  841.         segment->index_edit_rate.den = avio_rb32(pb);

  842.         av_dlog(NULL, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,

  843.                 segment->index_edit_rate.den);

  844.         break;

  845.     case 0x3F0C:

  846.         segment->index_start_position = avio_rb64(pb);

  847.         av_dlog(NULL, "IndexStartPosition %"PRId64"\n", segment->index_start_position);

  848.         break;

  849.     case 0x3F0D:

  850.         segment->index_duration = avio_rb64(pb);

  851.         av_dlog(NULL, "IndexDuration %"PRId64"\n", segment->index_duration);

  852.         break;

  853.     }

  854.     return 0;

  855. }

  856. 

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

  858. {

  859.     int code, value, ofs = 0;

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

  861. 

  862.     do {

  863.         code = avio_r8(pb);

  864.         value = avio_r8(pb);

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

  866. 

  867.         if (ofs < 16) {

  868.             layout[ofs++] = code;

  869.             layout[ofs++] = value;

  870.         }

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

  872. 

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

  874. }

  875. 

  876. static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)

  877. {

  878.     MXFDescriptor *descriptor = arg;

  879.     switch(tag) {

  880.     case 0x3F01:

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

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

  883.             return -1;

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

  885.         if (!descriptor->sub_descriptors_refs)

  886.             return -1;

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

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

  889.         break;

  890.     case 0x3004:

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

  892.         break;

  893.     case 0x3006:

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

  895.         break;

  896.     case 0x3201: /* PictureEssenceCoding */

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

  898.         break;

  899.     case 0x3203:

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

  901.         break;

  902.     case 0x3202:

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

  904.         break;

  905.     case 0x320E:

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

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

  908.         break;

  909.     case 0x3D03:

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

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

  912.         break;

  913.     case 0x3D06: /* SoundEssenceCompression */

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

  915.         break;

  916.     case 0x3D07:

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

  918.         break;

  919.     case 0x3D01:

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

  921.         break;

  922.     case 0x3401:

  923.         mxf_read_pixel_layout(pb, descriptor);

  924.         break;

  925.     default:

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

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

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

  929.             if (!descriptor->extradata)

  930.                 return -1;

  931.             descriptor->extradata_size = size;

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

  933.         }

  934.         break;

  935.     }

  936.     return 0;

  937. }

  938. 

  939. /*

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

  941.  * Returns: boolean

  942.  */

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

  944. {

  945.     int i;

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

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

  948.             return 0;

  949.     }

  950.     return 1;

  951. }

  952. 

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

  954. {

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

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

  957.             break;

  958.         uls++;

  959.     }

  960.     return uls;

  961. }

  962. 

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

  964. {

  965.     int i;

  966. 

  967.     if (!strong_ref)

  968.         return NULL;

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

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

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

  972.             return mxf->metadata_sets[i];

  973.         }

  974.     }

  975.     return NULL;

  976. }

  977. 

  978. static const MXFCodecUL mxf_essence_container_uls[] = {

  979.     // video essence container uls

  980.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  981.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  982.     // sound essence container uls

  983.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  984.     { { 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 */

  985.     { { 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 */

  986.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  987.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  988. };

  989. 

  990. static UID mxf_d10_ul = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 };

  991. 

  992. static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)

  993. {

  994.     int i, j, nb_segments = 0;

  995.     MXFIndexTableSegment **unsorted_segments;

  996.     int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;

  997. 

  998.     /* count number of segments, allocate arrays and copy unsorted segments */

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

  1000.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  1001.             nb_segments++;

  1002. 

  1003.     if (!(unsorted_segments = av_calloc(nb_segments, sizeof(*unsorted_segments))) ||

  1004.         !(*sorted_segments  = av_calloc(nb_segments, sizeof(**sorted_segments)))) {

  1005.         av_free(unsorted_segments);

  1006.         return AVERROR(ENOMEM);

  1007.     }

  1008. 

  1009.     for (i = j = 0; i < mxf->metadata_sets_count; i++)

  1010.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  1011.             unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];

  1012. 

  1013.     *nb_sorted_segments = 0;

  1014. 

  1015.     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */

  1016.     for (i = 0; i < nb_segments; i++) {

  1017.         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;

  1018. 

  1019.         for (j = 0; j < nb_segments; j++) {

  1020.             MXFIndexTableSegment *s = unsorted_segments[j];

  1021. 

  1022.             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.

  1023.              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.

  1024.              */

  1025.             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&

  1026.                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {

  1027.                 best             = j;

  1028.                 best_body_sid    = s->body_sid;

  1029.                 best_index_sid   = s->index_sid;

  1030.                 best_index_start = s->index_start_position;

  1031.             }

  1032.         }

  1033. 

  1034.         /* no suitable entry found -> we're done */

  1035.         if (best == -1)

  1036.             break;

  1037. 

  1038.         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];

  1039.         last_body_sid    = best_body_sid;

  1040.         last_index_sid   = best_index_sid;

  1041.         last_index_start = best_index_start;

  1042.     }

  1043. 

  1044.     av_free(unsorted_segments);

  1045. 

  1046.     return 0;

  1047. }

  1048. 

  1049. /**

  1050.  * Computes the absolute file offset of the given essence container offset

  1051.  */

  1052. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1053. {

  1054.     int x;

  1055.     int64_t offset_in = offset;     /* for logging */

  1056. 

  1057.     for (x = 0; x < mxf->partitions_count; x++) {

  1058.         MXFPartition *p = &mxf->partitions[x];

  1059. 

  1060.         if (p->body_sid != body_sid)

  1061.             continue;

  1062. 

  1063.         if (offset < p->essence_length || !p->essence_length) {

  1064.             *offset_out = p->essence_offset + offset;

  1065.             return 0;

  1066.         }

  1067. 

  1068.         offset -= p->essence_length;

  1069.     }

  1070. 

  1071.     av_log(mxf->fc, AV_LOG_ERROR, "failed to find absolute offset of %lx in BodySID %i - partial file?\n",

  1072.            offset_in, body_sid);

  1073. 

  1074.     return AVERROR_INVALIDDATA;

  1075. }

  1076. 

  1077. static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)

  1078. {

  1079.     int j, k, ret, nb_sorted_segments;

  1080.     MXFIndexTableSegment **sorted_segments;

  1081.     int n_delta = track_id - 1;  /* TrackID = 1-based stream index */

  1082. 

  1083.     if (track_id < 1) {

  1084.         av_log(mxf->fc, AV_LOG_ERROR, "TrackID not positive: %i\n", track_id);

  1085.         return AVERROR_INVALIDDATA;

  1086.     }

  1087. 

  1088.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)))

  1089.         return ret;

  1090. 

  1091.     for (j = 0; j < nb_sorted_segments; j++) {

  1092.         int duration, sample_duration = 1, last_sample_size = 0;

  1093.         int64_t segment_size;

  1094.         MXFIndexTableSegment *tableseg = sorted_segments[j];

  1095. 

  1096.         if (n_delta >= tableseg->nb_delta_entries && st->index != 0)

  1097.             continue;

  1098.         duration = tableseg->index_duration > 0 ? tableseg->index_duration :

  1099.             st->duration - st->nb_index_entries;

  1100.         segment_size = tableseg->edit_unit_byte_count * duration;

  1101.         /* check small EditUnitByteCount for audio */

  1102.         if (tableseg->edit_unit_byte_count && tableseg->edit_unit_byte_count < 32

  1103.             && !tableseg->index_duration) {

  1104.             /* duration might be prime relative to the new sample_duration,

  1105.              * which means we need to handle the last frame differently */

  1106.             sample_duration = 8192;

  1107.             last_sample_size = (duration % sample_duration) * tableseg->edit_unit_byte_count;

  1108.             tableseg->edit_unit_byte_count *= sample_duration;

  1109.             duration /= sample_duration;

  1110.             if (last_sample_size) duration++;

  1111.         }

  1112. 

  1113.         for (k = 0; k < duration; k++) {

  1114.             int64_t pos;

  1115.             int size, flags = 0;

  1116. 

  1117.             if (k < tableseg->nb_index_entries) {

  1118.                 pos = tableseg->stream_offset_entries[k];

  1119.                 if (n_delta < tableseg->nb_delta_entries) {

  1120.                     if (n_delta < tableseg->nb_delta_entries - 1) {

  1121.                         size =

  1122.                             tableseg->slice_offset_entries[k][tableseg->slice[n_delta+1]-1] +

  1123.                             tableseg->element_delta[n_delta+1] -

  1124.                             tableseg->element_delta[n_delta];

  1125.                         if (tableseg->slice[n_delta] > 0)

  1126.                             size -= tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1127.                     } else if (k < duration - 1) {

  1128.                         size = tableseg->stream_offset_entries[k+1] -

  1129.                             tableseg->stream_offset_entries[k] -

  1130.                             tableseg->slice_offset_entries[k][tableseg->slice[tableseg->nb_delta_entries-1]-1] -

  1131.                             tableseg->element_delta[tableseg->nb_delta_entries-1];

  1132.                     } else

  1133.                         size = 0;

  1134.                     if (tableseg->slice[n_delta] > 0)

  1135.                         pos += tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1136.                     pos += tableseg->element_delta[n_delta];

  1137.                 } else

  1138.                     size = 0;

  1139.                 flags = !(tableseg->flag_entries[k] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1140.             } else {

  1141.                 pos = (int64_t)(tableseg->index_start_position + k) * tableseg->edit_unit_byte_count;

  1142.                 if (n_delta < tableseg->nb_delta_entries - 1)

  1143.                     size = tableseg->element_delta[n_delta+1] - tableseg->element_delta[n_delta];

  1144.                 else {

  1145.                     /* use smaller size for last sample if we should */

  1146.                     if (last_sample_size && k == duration - 1)

  1147.                         size = last_sample_size;

  1148.                     else

  1149.                         size = tableseg->edit_unit_byte_count;

  1150.                     if (tableseg->nb_delta_entries)

  1151.                         size -= tableseg->element_delta[tableseg->nb_delta_entries-1];

  1152.                 }

  1153.                 if (n_delta < tableseg->nb_delta_entries)

  1154.                     pos += tableseg->element_delta[n_delta];

  1155.                 flags = AVINDEX_KEYFRAME;

  1156.             }

  1157. 

  1158.             if (mxf_absolute_bodysid_offset(mxf, tableseg->body_sid, pos, &pos) < 0) {

  1159.                 /* probably partial file - no point going further for this stream */

  1160.                 break;

  1161.             }

  1162. 

  1163.             av_dlog(mxf->fc, "Stream %d IndexEntry %d TrackID %d Offset %"PRIx64" Timestamp %"PRId64"\n",

  1164.                     st->index, st->nb_index_entries, track_id, pos, sample_duration * st->nb_index_entries);

  1165. 

  1166.             if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)

  1167.                 return ret;

  1168.         }

  1169.     }

  1170. 

  1171.     av_free(sorted_segments);

  1172. 

  1173.     return 0;

  1174. }

  1175. 

  1176. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1177. {

  1178.     MXFPackage *material_package = NULL;

  1179.     MXFPackage *temp_package = NULL;

  1180.     int i, j, k, ret;

  1181. 

  1182.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1183.     /* TODO: handle multiple material packages (OP3x) */

  1184.     for (i = 0; i < mxf->packages_count; i++) {

  1185.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1186.         if (material_package) break;

  1187.     }

  1188.     if (!material_package) {

  1189.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1190.         return -1;

  1191.     }

  1192. 

  1193.     for (i = 0; i < material_package->tracks_count; i++) {

  1194.         MXFPackage *source_package = NULL;

  1195.         MXFTrack *material_track = NULL;

  1196.         MXFTrack *source_track = NULL;

  1197.         MXFTrack *temp_track = NULL;

  1198.         MXFDescriptor *descriptor = NULL;

  1199.         MXFStructuralComponent *component = NULL;

  1200.         UID *essence_container_ul = NULL;

  1201.         const MXFCodecUL *codec_ul = NULL;

  1202.         const MXFCodecUL *container_ul = NULL;

  1203.         AVStream *st;

  1204. 

  1205.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1206.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1207.             continue;

  1208.         }

  1209. 

  1210.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1211.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1212.             continue;

  1213.         }

  1214. 

  1215.         /* TODO: handle multiple source clips */

  1216.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1217.             /* TODO: handle timecode component */

  1218.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1219.             if (!component)

  1220.                 continue;

  1221. 

  1222.             for (k = 0; k < mxf->packages_count; k++) {

  1223.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1224.                 if (!temp_package)

  1225.                     continue;

  1226.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1227.                     source_package = temp_package;

  1228.                     break;

  1229.                 }

  1230.             }

  1231.             if (!source_package) {

  1232.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1233.                 break;

  1234.             }

  1235.             for (k = 0; k < source_package->tracks_count; k++) {

  1236.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1237.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1238.                     return -1;

  1239.                 }

  1240.                 if (temp_track->track_id == component->source_track_id) {

  1241.                     source_track = temp_track;

  1242.                     break;

  1243.                 }

  1244.             }

  1245.             if (!source_track) {

  1246.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1247.                 break;

  1248.             }

  1249.         }

  1250.         if (!source_track)

  1251.             continue;

  1252. 

  1253.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1254.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1255.             return -1;

  1256.         }

  1257. 

  1258.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1259.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1260.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1261.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1262.             continue;

  1263.         }

  1264. 

  1265.         st = avformat_new_stream(mxf->fc, NULL);

  1266.         if (!st) {

  1267.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1268.             return -1;

  1269.         }

  1270.         st->id = source_track->track_id;

  1271.         st->priv_data = source_track;

  1272.         st->duration = component->duration;

  1273.         if (st->duration == -1)

  1274.             st->duration = AV_NOPTS_VALUE;

  1275.         st->start_time = component->start_position;

  1276.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1277. 

  1278.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1279.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1280.         st->codec->codec_type = codec_ul->id;

  1281. 

  1282.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1283.         if (source_package->descriptor) {

  1284.             if (source_package->descriptor->type == MultipleDescriptor) {

  1285.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1286.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1287. 

  1288.                     if (!sub_descriptor) {

  1289.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1290.                         continue;

  1291.                     }

  1292.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1293.                         descriptor = sub_descriptor;

  1294.                         break;

  1295.                     }

  1296.                 }

  1297.             } else if (source_package->descriptor->type == Descriptor)

  1298.                 descriptor = source_package->descriptor;

  1299.         }

  1300.         if (!descriptor) {

  1301.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1302.             continue;

  1303.         }

  1304.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1305.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1306.         essence_container_ul = &descriptor->essence_container_ul;

  1307.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1308.          * is not allowed according to s429-6, try to find correct information anyway */

  1309.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1310.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1311.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1312.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1313.                 if (metadata->type == CryptoContext) {

  1314.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1315.                     break;

  1316.                 }

  1317.             }

  1318.         }

  1319. 

  1320.         /* HACK: revert to the old demuxing/seeking scode for D-10 for now */

  1321.         if (mxf_match_uid(essence_container_ul, mxf_d10_ul, 14))

  1322.             mxf->d10 = 1;

  1323. 

  1324.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1325.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1326.         st->codec->codec_id = codec_ul->id;

  1327.         if (descriptor->extradata) {

  1328.             st->codec->extradata = descriptor->extradata;

  1329.             st->codec->extradata_size = descriptor->extradata_size;

  1330.         }

  1331.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1332.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  1333.             if (st->codec->codec_id == CODEC_ID_NONE)

  1334.                 st->codec->codec_id = container_ul->id;

  1335.             st->codec->width = descriptor->width;

  1336.             st->codec->height = descriptor->height;

  1337.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1338.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1339.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1340.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1341.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  1342.             if (st->codec->codec_id == CODEC_ID_NONE)

  1343.                 st->codec->codec_id = container_ul->id;

  1344.             st->codec->channels = descriptor->channels;

  1345.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1346.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1347.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1348.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1349.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1350.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1351.                 else if (descriptor->bits_per_sample == 32)

  1352.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1353.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1354.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1355.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1356.                 else if (descriptor->bits_per_sample == 32)

  1357.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1358.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1359.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1360.             }

  1361.         }

  1362.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1363.             /* TODO: decode timestamps */

  1364.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1365.         }

  1366. 

  1367.         if ((ret = mxf_parse_index(mxf, material_track->track_id, st)))

  1368.             return ret;

  1369.     }

  1370.     return 0;

  1371. }

  1372. 

  1373. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1374.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1375.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1376.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1377.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1378.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1379.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1380.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1381.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1382.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1383.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1384.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1385.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1386.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1387.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1388.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1389.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1390.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1391.     { { 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 */

  1392.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1393.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1394.     { { 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 */

  1395.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1396.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1397.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1398.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1399.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1400.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1401.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1402. };

  1403. 

  1404. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1405. {

  1406.     AVIOContext *pb = mxf->fc->pb;

  1407.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1408.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1409. 

  1410.     if (!ctx)

  1411.         return -1;

  1412.     while (avio_tell(pb) + 4 < klv_end) {

  1413.         int tag = avio_rb16(pb);

  1414.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1415.         uint64_t next = avio_tell(pb) + size;

  1416.         UID uid = {0};

  1417. 

  1418.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1419.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1420.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1421.             continue;

  1422.         }

  1423.         if (tag > 0x7FFF) { /* dynamic tag */

  1424.             int i;

  1425.             for (i = 0; i < mxf->local_tags_count; i++) {

  1426.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1427.                 if (local_tag == tag) {

  1428.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1429.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1430.                     PRINT_KEY(mxf->fc, "uid", uid);

  1431.                 }

  1432.             }

  1433.         }

  1434.         if (ctx_size && tag == 0x3C0A)

  1435.             avio_read(pb, ctx->uid, 16);

  1436.         else if (read_child(ctx, pb, tag, size, uid, -1) < 0)

  1437.             return -1;

  1438. 

  1439.         avio_seek(pb, next, SEEK_SET);

  1440.     }

  1441.     if (ctx_size) ctx->type = type;

  1442.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1443. }

  1444. 

  1445. /**

  1446.  * Seeks to the previous partition, if possible

  1447.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1448.  */

  1449. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1450. {

  1451.     AVIOContext *pb = mxf->fc->pb;

  1452. 

  1453.     if (!mxf->current_partition ||

  1454.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1455.         return 0;   /* we've parsed all partitions */

  1456. 

  1457.     /* seek to previous partition */

  1458.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1459.     mxf->current_partition = NULL;

  1460. 

  1461.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1462. 

  1463.     return 1;

  1464. }

  1465. 

  1466. /**

  1467.  * Called when essence is encountered

  1468.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1469.  */

  1470. static int mxf_parse_handle_essence(MXFContext *mxf)

  1471. {

  1472.     AVIOContext *pb = mxf->fc->pb;

  1473.     int64_t ret;

  1474. 

  1475.     if (!mxf->current_partition) {

  1476.         av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to PartitionPack\n");

  1477.         return AVERROR_INVALIDDATA;

  1478.     }

  1479. 

  1480.     if (mxf->parsing_backward) {

  1481.         return mxf_seek_to_previous_partition(mxf);

  1482.     } else {

  1483.         if (!mxf->footer_partition) {

  1484.             av_dlog(mxf->fc, "no footer\n");

  1485.             return 0;

  1486.         }

  1487. 

  1488.         av_dlog(mxf->fc, "seeking to footer\n");

  1489. 

  1490.         /* remember where we were so we don't end up seeking further back than this */

  1491.         mxf->last_forward_tell = avio_tell(pb);

  1492. 

  1493.         if (!pb->seekable) {

  1494.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1495.             return -1;

  1496.         }

  1497. 

  1498.         /* seek to footer partition and parse backward */

  1499.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1500.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1501.                    mxf->run_in + mxf->footer_partition, ret);

  1502.             return ret;

  1503.         }

  1504. 

  1505.         mxf->current_partition = NULL;

  1506.         mxf->parsing_backward = 1;

  1507.     }

  1508. 

  1509.     return 1;

  1510. }

  1511. 

  1512. /**

  1513.  * Called when the next partition or EOF is encountered

  1514.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1515.  */

  1516. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1517. {

  1518.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1519. }

  1520. 

  1521. /**

  1522.  * Figures out the proper offset and length of the essence container in each partition

  1523.  */

  1524. static void mxf_compute_essence_containers(MXFContext *mxf)

  1525. {

  1526.     int x;

  1527. 

  1528.     /* everything is already correct */

  1529.     if (mxf->op == OPAtom)

  1530.         return;

  1531. 

  1532.     for (x = 0; x < mxf->partitions_count; x++) {

  1533.         MXFPartition *p = &mxf->partitions[x];

  1534. 

  1535.         if (!p->body_sid)

  1536.             continue;       /* BodySID == 0 -> no essence */

  1537. 

  1538.         if (x >= mxf->partitions_count - 1)

  1539.             break;          /* last partition - can't compute length (and we don't need to) */

  1540. 

  1541.         /* essence container spans to the next partition */

  1542.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1543. 

  1544.         if (p->essence_length < 0) {

  1545.             /* next ThisPartition < essence_offset */

  1546.             p->essence_length = 0;

  1547.             av_log(mxf->fc, AV_LOG_ERROR, "partition %i: bad ThisPartition = %lx\n",

  1548.                    x+1, mxf->partitions[x+1].this_partition);

  1549.         }

  1550.     }

  1551. }

  1552. 

  1553. static int64_t round_to_kag(int64_t position, int kag_size)

  1554. {

  1555.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1556.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1557.     int64_t ret = (position / kag_size) * kag_size;

  1558.     return ret == position ? ret : ret + kag_size;

  1559. }

  1560. 

  1561. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1562. {

  1563.     MXFContext *mxf = s->priv_data;

  1564.     KLVPacket klv;

  1565.     int64_t essence_offset = 0;

  1566. 

  1567.     mxf->last_forward_tell = INT64_MAX;

  1568. 

  1569.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1570.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1571.         return -1;

  1572.     }

  1573.     avio_seek(s->pb, -14, SEEK_CUR);

  1574.     mxf->fc = s;

  1575.     mxf->run_in = avio_tell(s->pb);

  1576. 

  1577.     while (!url_feof(s->pb)) {

  1578.         const MXFMetadataReadTableEntry *metadata;

  1579. 

  1580.         if (klv_read_packet(&klv, s->pb) < 0) {

  1581.             /* EOF - seek to previous partition or stop */

  1582.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1583.                 break;

  1584.             else

  1585.                 continue;

  1586.         }

  1587. 

  1588.         PRINT_KEY(s, "read header", klv.key);

  1589.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1590.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1591.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1592.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1593.             if (!mxf->current_partition->essence_offset) {

  1594.                 /* for OP1a we compute essence_offset

  1595.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1596.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1597.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1598.                  */

  1599.                 int64_t op1a_essence_offset =

  1600.                     round_to_kag(mxf->current_partition->this_partition +

  1601.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1602.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1603.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1604. 

  1605.                 if (mxf->op == OPAtom) {

  1606.                     /* point essence_offset to the actual data

  1607.                     * OPAtom has all the essence in one big KLV

  1608.                     */

  1609.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1610.                     mxf->current_partition->essence_length = klv.length;

  1611.                 } else {

  1612.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1613.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1614.                 }

  1615.             }

  1616. 

  1617.             if (!essence_offset)

  1618.                 essence_offset = klv.offset;

  1619. 

  1620.             /* seek to footer, previous partition or stop */

  1621.             if (mxf_parse_handle_essence(mxf) <= 0)

  1622.                 break;

  1623.             continue;

  1624.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1625.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1626.             /* next partition pack - keep going, seek to previous partition or stop */

  1627.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1628.                 break;

  1629.         }

  1630. 

  1631.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1632.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1633.                 int res;

  1634.                 if (klv.key[5] == 0x53) {

  1635.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1636.                 } else {

  1637.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1638.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1639.                     avio_seek(s->pb, next, SEEK_SET);

  1640.                 }

  1641.                 if (res < 0) {

  1642.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1643.                     return -1;

  1644.                 }

  1645.                 break;

  1646.             }

  1647.         }

  1648.         if (!metadata->read)

  1649.             avio_skip(s->pb, klv.length);

  1650.     }

  1651.     /* FIXME avoid seek */

  1652.     if (!essence_offset)  {

  1653.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1654.         return AVERROR_INVALIDDATA;

  1655.     }

  1656.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1657. 

  1658.     mxf_compute_essence_containers(mxf);

  1659. 

  1660.     return mxf_parse_structural_metadata(mxf);

  1661. }

  1662. 

  1663. static int mxf_read_close(AVFormatContext *s)

  1664. {

  1665.     MXFContext *mxf = s->priv_data;

  1666.     MXFIndexTableSegment *seg;

  1667.     int i, j;

  1668. 

  1669.     av_freep(&mxf->packages_refs);

  1670. 

  1671.     for (i = 0; i < s->nb_streams; i++)

  1672.         s->streams[i]->priv_data = NULL;

  1673. 

  1674.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1675.         switch (mxf->metadata_sets[i]->type) {

  1676.         case MultipleDescriptor:

  1677.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1678.             break;

  1679.         case Sequence:

  1680.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1681.             break;

  1682.         case SourcePackage:

  1683.         case MaterialPackage:

  1684.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1685.             break;

  1686.         case IndexTableSegment:

  1687.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1688.             for (j = 0; j < seg->nb_index_entries; j++)

  1689.                 av_freep(&seg->slice_offset_entries[j]);

  1690.             av_freep(&seg->slice);

  1691.             av_freep(&seg->element_delta);

  1692.             av_freep(&seg->temporal_offset_entries);

  1693.             av_freep(&seg->flag_entries);

  1694.             av_freep(&seg->stream_offset_entries);

  1695.             av_freep(&seg->slice_offset_entries);

  1696.             break;

  1697.         default:

  1698.             break;

  1699.         }

  1700.         av_freep(&mxf->metadata_sets[i]);

  1701.     }

  1702.     av_freep(&mxf->partitions);

  1703.     av_freep(&mxf->metadata_sets);

  1704.     av_freep(&mxf->aesc);

  1705.     av_freep(&mxf->local_tags);

  1706.     return 0;

  1707. }

  1708. 

  1709. static int mxf_probe(AVProbeData *p) {

  1710.     uint8_t *bufp = p->buf;

  1711.     uint8_t *end = p->buf + p->buf_size;

  1712. 

  1713.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1714.         return 0;

  1715. 

  1716.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1717.     end -= sizeof(mxf_header_partition_pack_key);

  1718.     for (; bufp < end; bufp++) {

  1719.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1720.             return AVPROBE_SCORE_MAX;

  1721.     }

  1722.     return 0;

  1723. }

  1724. 

  1725. /* rudimentary byte seek */

  1726. /* XXX: use MXF Index */

  1727. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1728. {

  1729.     AVStream *st = s->streams[stream_index];

  1730.     int64_t seconds;

  1731.     MXFContext* mxf = s->priv_data;

  1732.     int64_t seekpos;

  1733.     int index;

  1734. 

  1735.     if (mxf->d10) {

  1736.     if (!s->bit_rate)

  1737.         return -1;

  1738.     if (sample_time < 0)

  1739.         sample_time = 0;

  1740.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1741.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1742.         return -1;

  1743.     ff_update_cur_dts(s, st, sample_time);

  1744.     } else {

  1745.         if (st->nb_index_entries <= 0)

  1746.             return -1;

  1747. 

  1748.         index = av_index_search_timestamp(st, sample_time, flags);

  1749. 

  1750.         av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, sample_time, index);

  1751. 

  1752.         if (index < 0) {

  1753.             if (sample_time < st->index_entries[0].timestamp)

  1754.                 index = 0;

  1755.             else

  1756.                 return -1;

  1757.         }

  1758. 

  1759.         seekpos = st->index_entries[index].pos;

  1760.         av_update_cur_dts(s, st, st->index_entries[index].timestamp);

  1761.         mxf->current_edit_unit = st->index_entries[index].timestamp;

  1762.         mxf->current_stream = 0;

  1763.         avio_seek(s->pb, seekpos, SEEK_SET);

  1764.     }

  1765.     return 0;

  1766. }

  1767. 

  1768. AVInputFormat ff_mxf_demuxer = {

  1769.     .name           = "mxf",

  1770.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1771.     .priv_data_size = sizeof(MXFContext),

  1772.     .read_probe     = mxf_probe,

  1773.     .read_header    = mxf_read_header,

  1774.     .read_packet    = mxf_read_packet,

  1775.     .read_close     = mxf_read_close,

  1776.     .read_seek      = mxf_read_seek,

  1777. };