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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 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.     AVRational index_edit_rate;

  152.     uint64_t index_start_position;

  153.     uint64_t index_duration;

  154.     int8_t *temporal_offset_entries;

  155.     int *flag_entries;

  156.     uint64_t *stream_offset_entries;

  157.     int nb_index_entries;

  158. } MXFIndexTableSegment;

  159. 

  160. typedef struct {

  161.     UID uid;

  162.     enum MXFMetadataSetType type;

  163.     UID package_uid;

  164.     UID *tracks_refs;

  165.     int tracks_count;

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

  167.     UID descriptor_ref;

  168. } MXFPackage;

  169. 

  170. typedef struct {

  171.     UID uid;

  172.     enum MXFMetadataSetType type;

  173. } MXFMetadataSet;

  174. 

  175. /* decoded index table */

  176. typedef struct {

  177.     int index_sid;

  178.     int body_sid;

  179.     int nb_ptses;               /* number of PTSes or total duration of index */

  180.     int64_t first_dts;          /* DTS = EditUnit + first_dts */

  181.     int64_t *ptses;             /* maps EditUnit -> PTS */

  182.     int nb_segments;

  183.     MXFIndexTableSegment **segments;    /* sorted by IndexStartPosition */

  184.     AVIndexEntry *fake_index;   /* used for calling ff_index_search_timestamp() */

  185. } MXFIndexTable;

  186. 

  187. typedef struct {

  188.     MXFPartition *partitions;

  189.     unsigned partitions_count;

  190.     MXFOP op;

  191.     UID *packages_refs;

  192.     int packages_count;

  193.     MXFMetadataSet **metadata_sets;

  194.     int metadata_sets_count;

  195.     AVFormatContext *fc;

  196.     struct AVAES *aesc;

  197.     uint8_t *local_tags;

  198.     int local_tags_count;

  199.     uint64_t footer_partition;

  200.     KLVPacket current_klv_data;

  201.     int current_klv_index;

  202.     int run_in;

  203.     MXFPartition *current_partition;

  204.     int parsing_backward;

  205.     int64_t last_forward_tell;

  206.     int last_forward_partition;

  207.     int current_edit_unit;

  208.     int nb_index_tables;

  209.     MXFIndexTable *index_tables;

  210. } MXFContext;

  211. 

  212. enum MXFWrappingScheme {

  213.     Frame,

  214.     Clip,

  215. };

  216. 

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

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

  219. 

  220. typedef struct {

  221.     const UID key;

  222.     MXFMetadataReadFunc *read;

  223.     int ctx_size;

  224.     enum MXFMetadataSetType type;

  225. } MXFMetadataReadTableEntry;

  226. 

  227. /* partial keys to match */

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

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

  230. static const uint8_t mxf_avid_essence_element_key[]        = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0e,0x04,0x03,0x01 };

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

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

  233. /* complete keys to match */

  234. 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 };

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

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

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

  238. 

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

  240. 

  241. static int64_t klv_decode_ber_length(AVIOContext *pb)

  242. {

  243.     uint64_t size = avio_r8(pb);

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

  245.         int bytes_num = size & 0x7f;

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

  247.         if (bytes_num > 8)

  248.             return AVERROR_INVALIDDATA;

  249.         size = 0;

  250.         while (bytes_num--)

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

  252.     }

  253.     return size;

  254. }

  255. 

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

  257. {

  258.     int i, b;

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

  260.         b = avio_r8(pb);

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

  262.             i = 0;

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

  264.             i = -1;

  265.     }

  266.     return i == size;

  267. }

  268. 

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

  270. {

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

  272.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  278. }

  279. 

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

  281. {

  282.     int i;

  283. 

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

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

  286.         /* SMPTE 379M 7.3 */

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

  288.             return i;

  289.     }

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

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

  292. }

  293. 

  294. /* XXX: use AVBitStreamFilter */

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

  296. {

  297.     const uint8_t *buf_ptr, *end_ptr;

  298.     uint8_t *data_ptr;

  299.     int i;

  300. 

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

  302.         return AVERROR_INVALIDDATA;

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

  304.     if (length < 0)

  305.         return length;

  306.     data_ptr = pkt->data;

  307.     end_ptr = pkt->data + length;

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

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

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

  311.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  314.             else

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

  316.         }

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

  318.     }

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

  320.     return 0;

  321. }

  322. 

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

  324. {

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

  326.     MXFContext *mxf = s->priv_data;

  327.     AVIOContext *pb = s->pb;

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

  329.     int64_t size;

  330.     uint64_t orig_size;

  331.     uint64_t plaintext_size;

  332.     uint8_t ivec[16];

  333.     uint8_t tmpbuf[16];

  334.     int index;

  335. 

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

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

  338.         if (!mxf->aesc)

  339.             return AVERROR(ENOMEM);

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

  341.     }

  342.     // crypto context

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

  344.     // plaintext offset

  345.     klv_decode_ber_length(pb);

  346.     plaintext_size = avio_rb64(pb);

  347.     // source klv key

  348.     klv_decode_ber_length(pb);

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

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

  351.         return AVERROR_INVALIDDATA;

  352.     index = mxf_get_stream_index(s, klv);

  353.     if (index < 0)

  354.         return AVERROR_INVALIDDATA;

  355.     // source size

  356.     klv_decode_ber_length(pb);

  357.     orig_size = avio_rb64(pb);

  358.     if (orig_size < plaintext_size)

  359.         return AVERROR_INVALIDDATA;

  360.     // enc. code

  361.     size = klv_decode_ber_length(pb);

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

  363.         return AVERROR_INVALIDDATA;

  364.     avio_read(pb, ivec, 16);

  365.     avio_read(pb, tmpbuf, 16);

  366.     if (mxf->aesc)

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

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

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

  370.     size -= 32;

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

  372.     if (size < 0)

  373.         return size;

  374.     else if (size < plaintext_size)

  375.         return AVERROR_INVALIDDATA;

  376.     size -= plaintext_size;

  377.     if (mxf->aesc)

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

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

  380.     av_shrink_packet(pkt, orig_size);

  381.     pkt->stream_index = index;

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

  383.     return 0;

  384. }

  385. 

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

  387. {

  388.     MXFContext *mxf = arg;

  389.     int item_num = avio_rb32(pb);

  390.     int item_len = avio_rb32(pb);

  391. 

  392.     if (item_len != 18) {

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

  394.                               item_len);

  395.         return AVERROR_PATCHWELCOME;

  396.     }

  397.     if (item_num > UINT_MAX / item_len)

  398.         return AVERROR_INVALIDDATA;

  399.     mxf->local_tags_count = item_num;

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

  401.     if (!mxf->local_tags)

  402.         return AVERROR(ENOMEM);

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

  404.     return 0;

  405. }

  406. 

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

  408. {

  409.     MXFContext *mxf = arg;

  410.     MXFPartition *partition, *tmp_part;

  411.     UID op;

  412.     uint64_t footer_partition;

  413. 

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

  415.         return AVERROR(ENOMEM);

  416. 

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

  418.     if (!tmp_part)

  419.         return AVERROR(ENOMEM);

  420.     mxf->partitions = tmp_part;

  421. 

  422.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  429.     } else {

  430.         mxf->last_forward_partition++;

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

  432.     }

  433. 

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

  435.     mxf->partitions_count++;

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

  437. 

  438.     switch(uid[13]) {

  439.     case 2:

  440.         partition->type = Header;

  441.         break;

  442.     case 3:

  443.         partition->type = BodyPartition;

  444.         break;

  445.     case 4:

  446.         partition->type = Footer;

  447.         break;

  448.     default:

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

  450.         return AVERROR_INVALIDDATA;

  451.     }

  452. 

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

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

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

  456.     avio_skip(pb, 4);

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

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

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

  460.     footer_partition = avio_rb64(pb);

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

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

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

  464.     avio_skip(pb, 8);

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

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

  467. 

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

  469.     if (footer_partition) {

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

  471.             av_log(mxf->fc, AV_LOG_ERROR,

  472.                    "inconsistent FooterPartition value: %"PRIu64" != %"PRIu64"\n",

  473.                    mxf->footer_partition, footer_partition);

  474.         } else {

  475.             mxf->footer_partition = footer_partition;

  476.         }

  477.     }

  478. 

  479.     av_dlog(mxf->fc,

  480.             "PartitionPack: ThisPartition = 0x%"PRIX64

  481.             ", PreviousPartition = 0x%"PRIX64", "

  482.             "FooterPartition = 0x%"PRIX64", IndexSID = %i, BodySID = %i\n",

  483.             partition->this_partition,

  484.             partition->previous_partition, footer_partition,

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

  486. 

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

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

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

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

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

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

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

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

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

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

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

  498.     else {

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

  500.         mxf->op = OP1a;

  501.     }

  502. 

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

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

  505. 

  506.         if (mxf->op == OPSonyOpt)

  507.             partition->kag_size = 512;

  508.         else

  509.             partition->kag_size = 1;

  510. 

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

  512.     }

  513. 

  514.     return 0;

  515. }

  516. 

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

  518. {

  519.     MXFMetadataSet **tmp;

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

  521.         return AVERROR(ENOMEM);

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

  523.     if (!tmp)

  524.         return AVERROR(ENOMEM);

  525.     mxf->metadata_sets = tmp;

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

  527.     mxf->metadata_sets_count++;

  528.     return 0;

  529. }

  530. 

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

  532. {

  533.     MXFCryptoContext *cryptocontext = arg;

  534.     if (size != 16)

  535.         return AVERROR_INVALIDDATA;

  536.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  538.     return 0;

  539. }

  540. 

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

  542. {

  543.     MXFContext *mxf = arg;

  544.     switch (tag) {

  545.     case 0x1901:

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

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

  548.             return AVERROR_INVALIDDATA;

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

  550.         if (!mxf->packages_refs)

  551.             return AVERROR(ENOMEM);

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

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

  554.         break;

  555.     }

  556.     return 0;

  557. }

  558. 

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

  560. {

  561.     MXFStructuralComponent *source_clip = arg;

  562.     switch(tag) {

  563.     case 0x0202:

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

  565.         break;

  566.     case 0x1201:

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

  568.         break;

  569.     case 0x1101:

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

  571.         avio_skip(pb, 16);

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

  573.         break;

  574.     case 0x1102:

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

  576.         break;

  577.     }

  578.     return 0;

  579. }

  580. 

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

  582. {

  583.     MXFPackage *package = arg;

  584.     switch(tag) {

  585.     case 0x4403:

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

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

  588.             return AVERROR_INVALIDDATA;

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

  590.         if (!package->tracks_refs)

  591.             return AVERROR(ENOMEM);

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

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

  594.         break;

  595.     }

  596.     return 0;

  597. }

  598. 

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

  600. {

  601.     MXFTrack *track = arg;

  602.     switch(tag) {

  603.     case 0x4801:

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

  605.         break;

  606.     case 0x4804:

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

  608.         break;

  609.     case 0x4B01:

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

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

  612.         break;

  613.     case 0x4803:

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

  615.         break;

  616.     }

  617.     return 0;

  618. }

  619. 

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

  621. {

  622.     MXFSequence *sequence = arg;

  623.     switch(tag) {

  624.     case 0x0202:

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

  626.         break;

  627.     case 0x0201:

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

  629.         break;

  630.     case 0x1001:

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

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

  633.             return AVERROR_INVALIDDATA;

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

  635.         if (!sequence->structural_components_refs)

  636.             return AVERROR(ENOMEM);

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

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

  639.         break;

  640.     }

  641.     return 0;

  642. }

  643. 

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

  645. {

  646.     MXFPackage *package = arg;

  647.     switch(tag) {

  648.     case 0x4403:

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

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

  651.             return AVERROR_INVALIDDATA;

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

  653.         if (!package->tracks_refs)

  654.             return AVERROR(ENOMEM);

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

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

  657.         break;

  658.     case 0x4401:

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

  660.         avio_skip(pb, 16);

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

  662.         break;

  663.     case 0x4701:

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

  665.         break;

  666.     }

  667.     return 0;

  668. }

  669. 

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

  671. {

  672.     int i, length;

  673. 

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

  675.     if (!segment->nb_index_entries)

  676.         return 0;

  677.     else if (segment->nb_index_entries < 0 ||

  678.              segment->nb_index_entries >

  679.              (INT_MAX >> av_log2(sizeof(*segment->stream_offset_entries))))

  680.         return AVERROR(ENOMEM);

  681. 

  682.     length = avio_rb32(pb);

  683. 

  684.     segment->temporal_offset_entries = av_mallocz(segment->nb_index_entries *

  685.                                  sizeof(*segment->temporal_offset_entries));

  686.     segment->flag_entries            = av_mallocz(segment->nb_index_entries *

  687.                                  sizeof(*segment->flag_entries));

  688.     segment->stream_offset_entries   = av_mallocz(segment->nb_index_entries *

  689.                                  sizeof(*segment->stream_offset_entries));

  690. 

  691.     if (!segment->flag_entries || !segment->stream_offset_entries ||

  692.         !segment->temporal_offset_entries) {

  693.         av_freep(&segment->flag_entries);

  694.         av_freep(&segment->stream_offset_entries);

  695.         av_freep(&segment->temporal_offset_entries);

  696.         return AVERROR(ENOMEM);

  697.     }

  698. 

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

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

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

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

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

  704.         avio_skip(pb, length - 11);

  705.     }

  706.     return 0;

  707. }

  708. 

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

  710. {

  711.     MXFIndexTableSegment *segment = arg;

  712.     switch(tag) {

  713.     case 0x3F05:

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

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

  716.         break;

  717.     case 0x3F06:

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

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

  720.         break;

  721.     case 0x3F07:

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

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

  724.         break;

  725.     case 0x3F0A:

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

  727.         return mxf_read_index_entry_array(pb, segment);

  728.     case 0x3F0B:

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

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

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

  732.                 segment->index_edit_rate.den);

  733.         break;

  734.     case 0x3F0C:

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

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

  737.         break;

  738.     case 0x3F0D:

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

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

  741.         break;

  742.     }

  743.     return 0;

  744. }

  745. 

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

  747. {

  748.     int code, value, ofs = 0;

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

  750. 

  751.     do {

  752.         code = avio_r8(pb);

  753.         value = avio_r8(pb);

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

  755. 

  756.         if (ofs < 16) {

  757.             layout[ofs++] = code;

  758.             layout[ofs++] = value;

  759.         }

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

  761. 

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

  763. }

  764. 

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

  766. {

  767.     MXFDescriptor *descriptor = arg;

  768.     switch(tag) {

  769.     case 0x3F01:

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

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

  772.             return AVERROR_INVALIDDATA;

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

  774.         if (!descriptor->sub_descriptors_refs)

  775.             return AVERROR(ENOMEM);

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

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

  778.         break;

  779.     case 0x3004:

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

  781.         break;

  782.     case 0x3006:

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

  784.         break;

  785.     case 0x3201: /* PictureEssenceCoding */

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

  787.         break;

  788.     case 0x3203:

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

  790.         break;

  791.     case 0x3202:

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

  793.         break;

  794.     case 0x320E:

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

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

  797.         break;

  798.     case 0x3D03:

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

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

  801.         break;

  802.     case 0x3D06: /* SoundEssenceCompression */

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

  804.         break;

  805.     case 0x3D07:

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

  807.         break;

  808.     case 0x3D01:

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

  810.         break;

  811.     case 0x3401:

  812.         mxf_read_pixel_layout(pb, descriptor);

  813.         break;

  814.     default:

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

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

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

  818.             if (!descriptor->extradata)

  819.                 return AVERROR(ENOMEM);

  820.             descriptor->extradata_size = size;

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

  822.         }

  823.         break;

  824.     }

  825.     return 0;

  826. }

  827. 

  828. /*

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

  830.  * Returns: boolean

  831.  */

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

  833. {

  834.     int i;

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

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

  837.             return 0;

  838.     }

  839.     return 1;

  840. }

  841. 

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

  843. {

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

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

  846.             break;

  847.         uls++;

  848.     }

  849.     return uls;

  850. }

  851. 

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

  853. {

  854.     int i;

  855. 

  856.     if (!strong_ref)

  857.         return NULL;

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

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

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

  861.             return mxf->metadata_sets[i];

  862.         }

  863.     }

  864.     return NULL;

  865. }

  866. 

  867. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  868.     // video essence container uls

  869.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  870.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  871.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  872. };

  873. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  874.     // sound essence container uls

  875.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  876.     { { 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 */

  877.     { { 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 */

  878.     { { 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 */

  879.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  880. };

  881. 

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

  883. {

  884.     int i, j, nb_segments = 0;

  885.     MXFIndexTableSegment **unsorted_segments;

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

  887. 

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

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

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

  891.             nb_segments++;

  892. 

  893.     *sorted_segments  = av_mallocz(nb_segments * sizeof(**sorted_segments));

  894.     unsorted_segments = av_mallocz(nb_segments * sizeof(*unsorted_segments));

  895.     if (!sorted_segments || !unsorted_segments) {

  896.         av_freep(sorted_segments);

  897.         av_free(unsorted_segments);

  898.         return AVERROR(ENOMEM);

  899.     }

  900. 

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

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

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

  904. 

  905.     *nb_sorted_segments = 0;

  906. 

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

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

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

  910. 

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

  912.             MXFIndexTableSegment *s = unsorted_segments[j];

  913. 

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

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

  916.              */

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

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

  919.                 best             = j;

  920.                 best_body_sid    = s->body_sid;

  921.                 best_index_sid   = s->index_sid;

  922.                 best_index_start = s->index_start_position;

  923.             }

  924.         }

  925. 

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

  927.         if (best == -1)

  928.             break;

  929. 

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

  931.         last_body_sid    = best_body_sid;

  932.         last_index_sid   = best_index_sid;

  933.         last_index_start = best_index_start;

  934.     }

  935. 

  936.     av_free(unsorted_segments);

  937. 

  938.     return 0;

  939. }

  940. 

  941. /**

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

  943.  */

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

  945. {

  946.     int x;

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

  948. 

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

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

  951. 

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

  953.             continue;

  954. 

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

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

  957.             return 0;

  958.         }

  959. 

  960.         offset -= p->essence_length;

  961.     }

  962. 

  963.     av_log(mxf->fc, AV_LOG_ERROR,

  964.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  965.            offset_in, body_sid);

  966. 

  967.     return AVERROR_INVALIDDATA;

  968. }

  969. 

  970. /**

  971.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  972.  */

  973. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  974. {

  975.     int x;

  976.     int64_t ret = 0;

  977. 

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

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

  980. 

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

  982.             continue;

  983. 

  984.         if (!p->essence_length)

  985.             return 0;

  986. 

  987.         ret = p->essence_offset + p->essence_length;

  988.     }

  989. 

  990.     return ret;

  991. }

  992. 

  993. /* EditUnit -> absolute offset */

  994. static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, int64_t *edit_unit_out, int64_t *offset_out, int nag)

  995. {

  996.     int i;

  997.     int64_t offset_temp = 0;

  998. 

  999.     for (i = 0; i < index_table->nb_segments; i++) {

  1000.         MXFIndexTableSegment *s = index_table->segments[i];

  1001. 

  1002.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1003. 

  1004.         if (edit_unit < s->index_start_position + s->index_duration) {

  1005.             int64_t index = edit_unit - s->index_start_position;

  1006. 

  1007.             if (s->edit_unit_byte_count)

  1008.                 offset_temp += s->edit_unit_byte_count * index;

  1009.             else if (s->nb_index_entries) {

  1010.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1011.                     index *= 2;     /* Avid index */

  1012. 

  1013.                 if (index < 0 || index > s->nb_index_entries) {

  1014.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1015.                            index_table->index_sid, s->index_start_position);

  1016.                     return AVERROR_INVALIDDATA;

  1017.                 }

  1018. 

  1019.                 offset_temp = s->stream_offset_entries[index];

  1020.             } else {

  1021.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1022.                        index_table->index_sid, s->index_start_position);

  1023.                 return AVERROR_INVALIDDATA;

  1024.             }

  1025. 

  1026.             if (edit_unit_out)

  1027.                 *edit_unit_out = edit_unit;

  1028. 

  1029.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1030.         } else {

  1031.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1032.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1033.         }

  1034.     }

  1035. 

  1036.     if (nag)

  1037.         av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);

  1038. 

  1039.     return AVERROR_INVALIDDATA;

  1040. }

  1041. 

  1042. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1043. {

  1044.     int i, j, x;

  1045.     int8_t max_temporal_offset = -128;

  1046. 

  1047.     /* first compute how many entries we have */

  1048.     for (i = 0; i < index_table->nb_segments; i++) {

  1049.         MXFIndexTableSegment *s = index_table->segments[i];

  1050. 

  1051.         if (!s->nb_index_entries)

  1052.             return 0;                               /* no TemporalOffsets */

  1053. 

  1054.         index_table->nb_ptses += s->index_duration;

  1055.     }

  1056. 

  1057.     /* paranoid check */

  1058.     if (index_table->nb_ptses <= 0)

  1059.         return 0;

  1060. 

  1061.     if (index_table->nb_ptses > INT_MAX >> av_log2(sizeof(AVIndexEntry)) + 1)

  1062.         return AVERROR(ENOMEM);

  1063. 

  1064.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1065.                                          sizeof(int64_t));

  1066.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1067.                                          sizeof(AVIndexEntry));

  1068.     if (!index_table->ptses || !index_table->fake_index) {

  1069.         av_freep(&index_table->ptses);

  1070.         return AVERROR(ENOMEM);

  1071.     }

  1072. 

  1073.     /* we may have a few bad TemporalOffsets

  1074.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1075.     for (x = 0; x < index_table->nb_ptses; x++)

  1076.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1077. 

  1078.     /**

  1079.      * We have this:

  1080.      *

  1081.      * x  TemporalOffset

  1082.      * 0:  0

  1083.      * 1:  1

  1084.      * 2:  1

  1085.      * 3: -2

  1086.      * 4:  1

  1087.      * 5:  1

  1088.      * 6: -2

  1089.      *

  1090.      * We want to transform it into this:

  1091.      *

  1092.      * x  DTS PTS

  1093.      * 0: -1   0

  1094.      * 1:  0   3

  1095.      * 2:  1   1

  1096.      * 3:  2   2

  1097.      * 4:  3   6

  1098.      * 5:  4   4

  1099.      * 6:  5   5

  1100.      *

  1101.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1102.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1103.      * The latter makes DTS <= PTS.

  1104.      */

  1105.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1106.         MXFIndexTableSegment *s = index_table->segments[i];

  1107.         int index_delta = 1;

  1108. 

  1109.         if (s->nb_index_entries == 2 * s->index_duration + 1)

  1110.             index_delta = 2;    /* Avid index */

  1111. 

  1112.         for (j = 0; j < s->nb_index_entries; j += index_delta, x++) {

  1113.             int offset = s->temporal_offset_entries[j] / index_delta;

  1114.             int index  = x + offset;

  1115. 

  1116.             index_table->fake_index[x].timestamp = x;

  1117.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1118. 

  1119.             if (index < 0 || index >= index_table->nb_ptses) {

  1120.                 av_log(mxf->fc, AV_LOG_ERROR,

  1121.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1122.                        x, offset, index);

  1123.                 continue;

  1124.             }

  1125. 

  1126.             index_table->ptses[index] = x;

  1127.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1128.         }

  1129.     }

  1130. 

  1131.     index_table->first_dts = -max_temporal_offset;

  1132. 

  1133.     return 0;

  1134. }

  1135. 

  1136. /**

  1137.  * Sorts and collects index table segments into index tables.

  1138.  * Also computes PTSes if possible.

  1139.  */

  1140. static int mxf_compute_index_tables(MXFContext *mxf)

  1141. {

  1142.     int i, j, k, ret, nb_sorted_segments;

  1143.     MXFIndexTableSegment **sorted_segments = NULL;

  1144. 

  1145.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1146.         nb_sorted_segments <= 0) {

  1147.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1148.         return 0;

  1149.     }

  1150. 

  1151.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1152.     for (i = 0; i < nb_sorted_segments; i++) {

  1153.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1154.             mxf->nb_index_tables++;

  1155.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1156.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1157.             ret = AVERROR_INVALIDDATA;

  1158.             goto finish_decoding_index;

  1159.         }

  1160.     }

  1161. 

  1162.     if (mxf->nb_index_tables > INT_MAX >> av_log2(sizeof(MXFIndexTable)) + 1 ||

  1163.         !(mxf->index_tables = av_mallocz(mxf->nb_index_tables *

  1164.                                          sizeof(MXFIndexTable)))) {

  1165.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1166.         ret = AVERROR(ENOMEM);

  1167.         goto finish_decoding_index;

  1168.     }

  1169. 

  1170.     /* distribute sorted segments to index tables */

  1171.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1172.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1173.             /* next IndexSID */

  1174.             j++;

  1175.         }

  1176. 

  1177.         mxf->index_tables[j].nb_segments++;

  1178.     }

  1179. 

  1180.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1181.         MXFIndexTable *t = &mxf->index_tables[j];

  1182. 

  1183.         if (t->nb_segments >

  1184.             (INT_MAX >> av_log2(sizeof(MXFIndexTableSegment *))) ||

  1185.             !(t->segments = av_mallocz(t->nb_segments *

  1186.                                        sizeof(MXFIndexTableSegment*)))) {

  1187.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1188.                    " pointer array\n");

  1189.             ret = AVERROR(ENOMEM);

  1190.             goto finish_decoding_index;

  1191.         }

  1192. 

  1193.         if (sorted_segments[i]->index_start_position)

  1194.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1195.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1196. 

  1197.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1198.         t->index_sid = sorted_segments[i]->index_sid;

  1199.         t->body_sid = sorted_segments[i]->body_sid;

  1200. 

  1201.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1202.             goto finish_decoding_index;

  1203. 

  1204.         /* fix zero IndexDurations */

  1205.         for (k = 0; k < t->nb_segments; k++) {

  1206.             if (t->segments[k]->index_duration)

  1207.                 continue;

  1208. 

  1209.             if (t->nb_segments > 1)

  1210.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1211.                        t->index_sid, k);

  1212. 

  1213.             if (mxf->fc->nb_streams <= 0) {

  1214.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1215.                 break;

  1216.             }

  1217. 

  1218.             /* assume the first stream's duration is reasonable

  1219.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1220.              */

  1221.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1222.             break;

  1223.         }

  1224.     }

  1225. 

  1226.     ret = 0;

  1227. finish_decoding_index:

  1228.     av_free(sorted_segments);

  1229.     return ret;

  1230. }

  1231. 

  1232. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1233. {

  1234.     MXFPackage *material_package = NULL;

  1235.     MXFPackage *temp_package = NULL;

  1236.     int i, j, k, ret;

  1237. 

  1238.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1239.     /* TODO: handle multiple material packages (OP3x) */

  1240.     for (i = 0; i < mxf->packages_count; i++) {

  1241.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1242.         if (material_package) break;

  1243.     }

  1244.     if (!material_package) {

  1245.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1246.         return AVERROR_INVALIDDATA;

  1247.     }

  1248. 

  1249.     for (i = 0; i < material_package->tracks_count; i++) {

  1250.         MXFPackage *source_package = NULL;

  1251.         MXFTrack *material_track = NULL;

  1252.         MXFTrack *source_track = NULL;

  1253.         MXFTrack *temp_track = NULL;

  1254.         MXFDescriptor *descriptor = NULL;

  1255.         MXFStructuralComponent *component = NULL;

  1256.         UID *essence_container_ul = NULL;

  1257.         const MXFCodecUL *codec_ul = NULL;

  1258.         const MXFCodecUL *container_ul = NULL;

  1259.         AVStream *st;

  1260. 

  1261.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1262.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1263.             continue;

  1264.         }

  1265. 

  1266.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1267.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1268.             continue;

  1269.         }

  1270. 

  1271.         /* TODO: handle multiple source clips */

  1272.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1273.             /* TODO: handle timecode component */

  1274.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1275.             if (!component)

  1276.                 continue;

  1277. 

  1278.             for (k = 0; k < mxf->packages_count; k++) {

  1279.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1280.                 if (!temp_package)

  1281.                     continue;

  1282.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1283.                     source_package = temp_package;

  1284.                     break;

  1285.                 }

  1286.             }

  1287.             if (!source_package) {

  1288.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1289.                 break;

  1290.             }

  1291.             for (k = 0; k < source_package->tracks_count; k++) {

  1292.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1293.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1294.                     ret = AVERROR_INVALIDDATA;

  1295.                     goto fail_and_free;

  1296.                 }

  1297.                 if (temp_track->track_id == component->source_track_id) {

  1298.                     source_track = temp_track;

  1299.                     break;

  1300.                 }

  1301.             }

  1302.             if (!source_track) {

  1303.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1304.                 break;

  1305.             }

  1306.         }

  1307.         if (!source_track)

  1308.             continue;

  1309. 

  1310.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1311.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1312.             ret = AVERROR_INVALIDDATA;

  1313.             goto fail_and_free;

  1314.         }

  1315. 

  1316.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1317.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1318.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1319.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1320.             continue;

  1321.         }

  1322. 

  1323.         st = avformat_new_stream(mxf->fc, NULL);

  1324.         if (!st) {

  1325.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1326.             ret = AVERROR(ENOMEM);

  1327.             goto fail_and_free;

  1328.         }

  1329.         st->id = source_track->track_id;

  1330.         st->priv_data = source_track;

  1331.         st->duration = component->duration;

  1332.         if (st->duration == -1)

  1333.             st->duration = AV_NOPTS_VALUE;

  1334.         st->start_time = component->start_position;

  1335.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1336. 

  1337.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1338.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1339.         st->codec->codec_type = codec_ul->id;

  1340. 

  1341.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1342.         if (source_package->descriptor) {

  1343.             if (source_package->descriptor->type == MultipleDescriptor) {

  1344.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1345.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1346. 

  1347.                     if (!sub_descriptor) {

  1348.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1349.                         continue;

  1350.                     }

  1351.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1352.                         descriptor = sub_descriptor;

  1353.                         break;

  1354.                     }

  1355.                 }

  1356.             } else if (source_package->descriptor->type == Descriptor)

  1357.                 descriptor = source_package->descriptor;

  1358.         }

  1359.         if (!descriptor) {

  1360.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1361.             continue;

  1362.         }

  1363.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1364.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1365.         essence_container_ul = &descriptor->essence_container_ul;

  1366.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1367.          * is not allowed according to s429-6, try to find correct information anyway */

  1368.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1369.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1370.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1371.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1372.                 if (metadata->type == CryptoContext) {

  1373.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1374.                     break;

  1375.                 }

  1376.             }

  1377.         }

  1378. 

  1379.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1380.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1381.         st->codec->codec_id = codec_ul->id;

  1382.         if (descriptor->extradata) {

  1383.             st->codec->extradata = descriptor->extradata;

  1384.             st->codec->extradata_size = descriptor->extradata_size;

  1385.         }

  1386.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1387.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1388.             if (st->codec->codec_id == CODEC_ID_NONE)

  1389.                 st->codec->codec_id = container_ul->id;

  1390.             st->codec->width = descriptor->width;

  1391.             st->codec->height = descriptor->height;

  1392.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1393.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1394.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1395.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1396.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1397.             if (st->codec->codec_id == CODEC_ID_NONE)

  1398.                 st->codec->codec_id = container_ul->id;

  1399.             st->codec->channels = descriptor->channels;

  1400.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1401.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1402.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1403.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1404.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1405.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1406.                 else if (descriptor->bits_per_sample == 32)

  1407.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1408.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1409.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1410.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1411.                 else if (descriptor->bits_per_sample == 32)

  1412.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1413.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1414.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1415.             }

  1416.         }

  1417.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1418.             /* TODO: decode timestamps */

  1419.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1420.         }

  1421.     }

  1422. 

  1423.     ret = 0;

  1424. fail_and_free:

  1425.     return ret;

  1426. }

  1427. 

  1428. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1429.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1430.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1431.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1432.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1433.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1434.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1435.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1436.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1437.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1438.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1439.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1440.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1441.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1442.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1443.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1444.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1445.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1446.     { { 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 */

  1447.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1448.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1449.     { { 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 */

  1450.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1451.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1452.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1453.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1454.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1455.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1456.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1457. };

  1458. 

  1459. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1460. {

  1461.     AVIOContext *pb = mxf->fc->pb;

  1462.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1463.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1464. 

  1465.     if (!ctx)

  1466.         return AVERROR(ENOMEM);

  1467.     while (avio_tell(pb) + 4 < klv_end) {

  1468.         int ret;

  1469.         int tag = avio_rb16(pb);

  1470.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1471.         uint64_t next = avio_tell(pb) + size;

  1472.         UID uid = {0};

  1473. 

  1474.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1475.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1476.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1477.             continue;

  1478.         }

  1479.         if (tag > 0x7FFF) { /* dynamic tag */

  1480.             int i;

  1481.             for (i = 0; i < mxf->local_tags_count; i++) {

  1482.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1483.                 if (local_tag == tag) {

  1484.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1485.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1486.                     PRINT_KEY(mxf->fc, "uid", uid);

  1487.                 }

  1488.             }

  1489.         }

  1490.         if (ctx_size && tag == 0x3C0A)

  1491.             avio_read(pb, ctx->uid, 16);

  1492.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1493.             return ret;

  1494. 

  1495.         avio_seek(pb, next, SEEK_SET);

  1496.     }

  1497.     if (ctx_size) ctx->type = type;

  1498.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1499. }

  1500. 

  1501. /**

  1502.  * Seeks to the previous partition, if possible

  1503.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1504.  */

  1505. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1506. {

  1507.     AVIOContext *pb = mxf->fc->pb;

  1508. 

  1509.     if (!mxf->current_partition ||

  1510.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1511.         return 0;   /* we've parsed all partitions */

  1512. 

  1513.     /* seek to previous partition */

  1514.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1515.     mxf->current_partition = NULL;

  1516. 

  1517.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1518. 

  1519.     return 1;

  1520. }

  1521. 

  1522. /**

  1523.  * Called when essence is encountered

  1524.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1525.  */

  1526. static int mxf_parse_handle_essence(MXFContext *mxf)

  1527. {

  1528.     AVIOContext *pb = mxf->fc->pb;

  1529.     int64_t ret;

  1530. 

  1531.     if (!mxf->current_partition) {

  1532.         av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to PartitionPack\n");

  1533.         return AVERROR_INVALIDDATA;

  1534.     }

  1535. 

  1536.     if (mxf->parsing_backward) {

  1537.         return mxf_seek_to_previous_partition(mxf);

  1538.     } else {

  1539.         if (!mxf->footer_partition) {

  1540.             av_dlog(mxf->fc, "no footer\n");

  1541.             return 0;

  1542.         }

  1543. 

  1544.         av_dlog(mxf->fc, "seeking to footer\n");

  1545. 

  1546.         /* remember where we were so we don't end up seeking further back than this */

  1547.         mxf->last_forward_tell = avio_tell(pb);

  1548. 

  1549.         if (!pb->seekable) {

  1550.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1551.             return -1;

  1552.         }

  1553. 

  1554.         /* seek to footer partition and parse backward */

  1555.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1556.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1557.                    mxf->run_in + mxf->footer_partition, ret);

  1558.             return ret;

  1559.         }

  1560. 

  1561.         mxf->current_partition = NULL;

  1562.         mxf->parsing_backward = 1;

  1563.     }

  1564. 

  1565.     return 1;

  1566. }

  1567. 

  1568. /**

  1569.  * Called when the next partition or EOF is encountered

  1570.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1571.  */

  1572. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1573. {

  1574.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1575. }

  1576. 

  1577. /**

  1578.  * Figure out the proper offset and length of the essence container

  1579.  * in each partition

  1580.  */

  1581. static void mxf_compute_essence_containers(MXFContext *mxf)

  1582. {

  1583.     int x;

  1584. 

  1585.     /* everything is already correct */

  1586.     if (mxf->op == OPAtom)

  1587.         return;

  1588. 

  1589.     for (x = 0; x < mxf->partitions_count; x++) {

  1590.         MXFPartition *p = &mxf->partitions[x];

  1591. 

  1592.         if (!p->body_sid)

  1593.             continue;       /* BodySID == 0 -> no essence */

  1594. 

  1595.         if (x >= mxf->partitions_count - 1)

  1596.             break;          /* last partition - can't compute length (and we don't need to) */

  1597. 

  1598.         /* essence container spans to the next partition */

  1599.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1600. 

  1601.         if (p->essence_length < 0) {

  1602.             /* next ThisPartition < essence_offset */

  1603.             p->essence_length = 0;

  1604.             av_log(mxf->fc, AV_LOG_ERROR,

  1605.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1606.                    x+1, mxf->partitions[x+1].this_partition);

  1607.         }

  1608.     }

  1609. }

  1610. 

  1611. static int64_t round_to_kag(int64_t position, int kag_size)

  1612. {

  1613.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1614.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1615.     int64_t ret = (position / kag_size) * kag_size;

  1616.     return ret == position ? ret : ret + kag_size;

  1617. }

  1618. 

  1619. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1620.                                                     MXFContext *mxf,

  1621.                                                     KLVPacket *klv)

  1622. {

  1623.     MXFPartition *cur_part = mxf->current_partition;

  1624.     /* for OP1a we compute essence_offset

  1625.      * for OPAtom we point essence_offset after the KL

  1626.      *     (usually op1a_essence_offset + 20 or 25)

  1627.      * TODO: for OP1a we could eliminate this entire if statement, always

  1628.      *       stopping parsing at op1a_essence_offset

  1629.      *       for OPAtom we still need the actual essence_offset though

  1630.      *       (the KL's length can vary)

  1631.      */

  1632.     int64_t op1a_essence_offset =

  1633.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1634.                      cur_part->kag_size) +

  1635.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1636.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1637. 

  1638.     if (mxf->op == OPAtom) {

  1639.         /* point essence_offset to the actual data

  1640.          * OPAtom has all the essence in one big KLV

  1641.          */

  1642.         cur_part->essence_offset = avio_tell(s->pb);

  1643.         cur_part->essence_length = klv->length;

  1644.     } else {

  1645.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1646.          * (C0023S01.mxf)  */

  1647.         cur_part->essence_offset = op1a_essence_offset;

  1648.     }

  1649. }

  1650. 

  1651. static int mxf_read_header(AVFormatContext *s)

  1652. {

  1653.     MXFContext *mxf = s->priv_data;

  1654.     KLVPacket klv;

  1655.     int64_t essence_offset = 0;

  1656.     int ret;

  1657. 

  1658.     mxf->last_forward_tell = INT64_MAX;

  1659. 

  1660.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1661.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1662.         return AVERROR_INVALIDDATA;

  1663.     }

  1664.     avio_seek(s->pb, -14, SEEK_CUR);

  1665.     mxf->fc = s;

  1666.     mxf->run_in = avio_tell(s->pb);

  1667. 

  1668.     while (!s->pb->eof_reached) {

  1669.         const MXFMetadataReadTableEntry *metadata;

  1670. 

  1671.         if (klv_read_packet(&klv, s->pb) < 0) {

  1672.             /* EOF - seek to previous partition or stop */

  1673.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1674.                 break;

  1675.             else

  1676.                 continue;

  1677.         }

  1678. 

  1679.         PRINT_KEY(s, "read header", klv.key);

  1680.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1681.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1682.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1683.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1684.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1685.             if (!mxf->current_partition->essence_offset) {

  1686.                 compute_partition_essence_offset(s, mxf, &klv);

  1687.             }

  1688. 

  1689.             if (!essence_offset)

  1690.                 essence_offset = klv.offset;

  1691. 

  1692.             /* seek to footer, previous partition or stop */

  1693.             if (mxf_parse_handle_essence(mxf) <= 0)

  1694.                 break;

  1695.             continue;

  1696.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1697.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1698.             /* next partition pack - keep going, seek to previous partition or stop */

  1699.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1700.                 break;

  1701.         }

  1702. 

  1703.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1704.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1705.                 int res;

  1706.                 if (klv.key[5] == 0x53) {

  1707.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1708.                 } else {

  1709.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1710.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1711.                     avio_seek(s->pb, next, SEEK_SET);

  1712.                 }

  1713.                 if (res < 0) {

  1714.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1715.                     return res;

  1716.                 }

  1717.                 break;

  1718.             }

  1719.         }

  1720.         if (!metadata->read)

  1721.             avio_skip(s->pb, klv.length);

  1722.     }

  1723.     /* FIXME avoid seek */

  1724.     if (!essence_offset)  {

  1725.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1726.         return AVERROR_INVALIDDATA;

  1727.     }

  1728.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1729. 

  1730.     mxf_compute_essence_containers(mxf);

  1731. 

  1732.     /* we need to do this before computing the index tables

  1733.      * to be able to fill in zero IndexDurations with st->duration */

  1734.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1735.         return ret;

  1736. 

  1737.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1738.         return ret;

  1739. 

  1740.     if (mxf->nb_index_tables > 1) {

  1741.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1742.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1743.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1744.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1745.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1746.         return AVERROR_INVALIDDATA;

  1747.     }

  1748. 

  1749.     return 0;

  1750. }

  1751. 

  1752. /**

  1753.  * Computes DTS and PTS for the given video packet based on its offset.

  1754.  */

  1755. static void mxf_packet_timestamps(MXFContext *mxf, AVPacket *pkt)

  1756. {

  1757.     int64_t next_ofs;

  1758.     MXFIndexTable *t = &mxf->index_tables[0];

  1759. 

  1760.     /* find mxf->current_edit_unit so that the next edit unit starts ahead of pkt->pos */

  1761.     for (;;) {

  1762.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_ofs, 0) < 0)

  1763.             break;

  1764. 

  1765.         if (next_ofs > pkt->pos)

  1766.             break;

  1767. 

  1768.         mxf->current_edit_unit++;

  1769.     }

  1770. 

  1771.     if (mxf->current_edit_unit >= t->nb_ptses)

  1772.         return;

  1773. 

  1774.     pkt->dts = mxf->current_edit_unit + t->first_dts;

  1775.     pkt->pts = t->ptses[mxf->current_edit_unit];

  1776. }

  1777. 

  1778. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1779. {

  1780.     KLVPacket klv;

  1781. 

  1782.     while (!s->pb->eof_reached) {

  1783.         if (klv_read_packet(&klv, s->pb) < 0)

  1784.             return -1;

  1785.         PRINT_KEY(s, "read packet", klv.key);

  1786.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1787.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1788.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  1789.             if (res < 0) {

  1790.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1791.                 return -1;

  1792.             }

  1793.             return 0;

  1794.         }

  1795.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1796.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  1797.             int index = mxf_get_stream_index(s, &klv);

  1798.             if (index < 0) {

  1799.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  1800.                 goto skip;

  1801.             }

  1802.             if (s->streams[index]->discard == AVDISCARD_ALL)

  1803.                 goto skip;

  1804.             /* check for 8 channels AES3 element */

  1805.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  1806.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  1807.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  1808.                     return -1;

  1809.                 }

  1810.             } else {

  1811.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  1812.                 if (ret < 0)

  1813.                     return ret;

  1814.             }

  1815.             pkt->stream_index = index;

  1816.             pkt->pos = klv.offset;

  1817. 

  1818.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)

  1819.                 mxf_packet_timestamps(s->priv_data, pkt);   /* offset -> EditUnit -> DTS/PTS */

  1820. 

  1821.             return 0;

  1822.         } else

  1823.         skip:

  1824.             avio_skip(s->pb, klv.length);

  1825.     }

  1826.     return AVERROR_EOF;

  1827. }

  1828. 

  1829. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1830. {

  1831.     MXFContext *mxf = s->priv_data;

  1832.     int ret, size;

  1833.     int64_t ret64, pos, next_pos;

  1834.     AVStream *st;

  1835.     MXFIndexTable *t;

  1836. 

  1837.     if (mxf->op != OPAtom)

  1838.         return mxf_read_packet_old(s, pkt);

  1839. 

  1840.     /* OPAtom - clip wrapped demuxing */

  1841.     st = s->streams[0];

  1842.     t = &mxf->index_tables[0];

  1843. 

  1844.     if (mxf->current_edit_unit >= st->duration)

  1845.         return AVERROR_EOF;

  1846. 

  1847.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  1848.         return ret;

  1849. 

  1850.     /* compute size by finding the next edit unit or the end of the essence container

  1851.      * not pretty, but it works */

  1852.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_pos, 0)) < 0 &&

  1853.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  1854.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  1855.         return AVERROR_INVALIDDATA;

  1856.     }

  1857. 

  1858.     if ((size = next_pos - pos) <= 0) {

  1859.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  1860.         return AVERROR_INVALIDDATA;

  1861.     }

  1862. 

  1863.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  1864.         return ret64;

  1865. 

  1866.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  1867.             return ret < 0 ? ret : AVERROR_EOF;

  1868. 

  1869.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  1870.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  1871.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  1872.         pkt->pts = t->ptses[mxf->current_edit_unit];

  1873.     }

  1874. 

  1875.     pkt->stream_index = 0;

  1876.     mxf->current_edit_unit++;

  1877. 

  1878.     return 0;

  1879. }

  1880. 

  1881. 

  1882. static int mxf_read_close(AVFormatContext *s)

  1883. {

  1884.     MXFContext *mxf = s->priv_data;

  1885.     MXFIndexTableSegment *seg;

  1886.     int i;

  1887. 

  1888.     av_freep(&mxf->packages_refs);

  1889. 

  1890.     for (i = 0; i < s->nb_streams; i++)

  1891.         s->streams[i]->priv_data = NULL;

  1892. 

  1893.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1894.         switch (mxf->metadata_sets[i]->type) {

  1895.         case MultipleDescriptor:

  1896.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1897.             break;

  1898.         case Sequence:

  1899.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1900.             break;

  1901.         case SourcePackage:

  1902.         case MaterialPackage:

  1903.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1904.             break;

  1905.         case IndexTableSegment:

  1906.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1907.             av_freep(&seg->temporal_offset_entries);

  1908.             av_freep(&seg->flag_entries);

  1909.             av_freep(&seg->stream_offset_entries);

  1910.             break;

  1911.         default:

  1912.             break;

  1913.         }

  1914.         av_freep(&mxf->metadata_sets[i]);

  1915.     }

  1916.     av_freep(&mxf->partitions);

  1917.     av_freep(&mxf->metadata_sets);

  1918.     av_freep(&mxf->aesc);

  1919.     av_freep(&mxf->local_tags);

  1920. 

  1921.     for (i = 0; i < mxf->nb_index_tables; i++) {

  1922.         av_freep(&mxf->index_tables[i].segments);

  1923.         av_freep(&mxf->index_tables[i].ptses);

  1924.         av_freep(&mxf->index_tables[i].fake_index);

  1925.     }

  1926.     av_freep(&mxf->index_tables);

  1927. 

  1928.     return 0;

  1929. }

  1930. 

  1931. static int mxf_probe(AVProbeData *p) {

  1932.     uint8_t *bufp = p->buf;

  1933.     uint8_t *end = p->buf + p->buf_size;

  1934. 

  1935.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1936.         return 0;

  1937. 

  1938.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1939.     end -= sizeof(mxf_header_partition_pack_key);

  1940.     for (; bufp < end; bufp++) {

  1941.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1942.             return AVPROBE_SCORE_MAX;

  1943.     }

  1944.     return 0;

  1945. }

  1946. 

  1947. /* rudimentary byte seek */

  1948. /* XXX: use MXF Index */

  1949. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1950. {

  1951.     AVStream *st = s->streams[stream_index];

  1952.     int64_t seconds;

  1953.     MXFContext* mxf = s->priv_data;

  1954.     int64_t seekpos;

  1955.     int ret;

  1956.     MXFIndexTable *t;

  1957. 

  1958.     if (mxf->index_tables <= 0) {

  1959.     if (!s->bit_rate)

  1960.         return AVERROR_INVALIDDATA;

  1961.     if (sample_time < 0)

  1962.         sample_time = 0;

  1963.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1964. 

  1965.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  1966.         return ret;

  1967.     ff_update_cur_dts(s, st, sample_time);

  1968.     } else {

  1969.         t = &mxf->index_tables[0];

  1970. 

  1971.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  1972.          * this also means we allow seeking before the start */

  1973.         sample_time = FFMAX(sample_time, 0);

  1974. 

  1975.         if (t->fake_index) {

  1976.             /* behave as if we have a proper index */

  1977.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  1978.                 return sample_time;

  1979.         } else {

  1980.             /* no IndexEntryArray (one or more CBR segments)

  1981.              * make sure we don't seek past the end */

  1982.             sample_time = FFMIN(sample_time, st->duration - 1);

  1983.         }

  1984. 

  1985.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  1986.             return ret;

  1987. 

  1988.         ff_update_cur_dts(s, st, sample_time);

  1989.         mxf->current_edit_unit = sample_time;

  1990.         avio_seek(s->pb, seekpos, SEEK_SET);

  1991.     }

  1992.     return 0;

  1993. }

  1994. 

  1995. AVInputFormat ff_mxf_demuxer = {

  1996.     .name           = "mxf",

  1997.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1998.     .priv_data_size = sizeof(MXFContext),

  1999.     .read_probe     = mxf_probe,

  2000.     .read_header    = mxf_read_header,

  2001.     .read_packet    = mxf_read_packet,

  2002.     .read_close     = mxf_read_close,

  2003.     .read_seek      = mxf_read_seek,

  2004. };