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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

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

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124. } MXFTrack;

  125. 

  126. typedef struct {

  127.     UID uid;

  128.     enum MXFMetadataSetType type;

  129.     UID essence_container_ul;

  130.     UID essence_codec_ul;

  131.     AVRational sample_rate;

  132.     AVRational aspect_ratio;

  133.     int width;

  134.     int height;

  135.     int channels;

  136.     int bits_per_sample;

  137.     UID *sub_descriptors_refs;

  138.     int sub_descriptors_count;

  139.     int linked_track_id;

  140.     uint8_t *extradata;

  141.     int extradata_size;

  142.     enum PixelFormat pix_fmt;

  143. } MXFDescriptor;

  144. 

  145. typedef struct {

  146.     UID uid;

  147.     enum MXFMetadataSetType type;

  148.     int edit_unit_byte_count;

  149.     int index_sid;

  150.     int body_sid;

  151.     int slice_count;

  152.     AVRational index_edit_rate;

  153.     uint64_t index_start_position;

  154.     uint64_t index_duration;

  155.     int *slice;

  156.     int *element_delta;

  157.     int nb_delta_entries;

  158.     int8_t *temporal_offset_entries;

  159.     int *flag_entries;

  160.     uint64_t *stream_offset_entries;

  161.     uint32_t **slice_offset_entries;

  162.     int nb_index_entries;

  163. } MXFIndexTableSegment;

  164. 

  165. typedef struct {

  166.     UID uid;

  167.     enum MXFMetadataSetType type;

  168.     UID package_uid;

  169.     UID *tracks_refs;

  170.     int tracks_count;

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

  172.     UID descriptor_ref;

  173. } MXFPackage;

  174. 

  175. typedef struct {

  176.     UID uid;

  177.     enum MXFMetadataSetType type;

  178. } MXFMetadataSet;

  179. 

  180. /* decoded index table */

  181. typedef struct {

  182.     int index_sid;

  183.     int body_sid;

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

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

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

  187.     int nb_segments;

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

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

  190. } MXFIndexTable;

  191. 

  192. typedef struct {

  193.     MXFPartition *partitions;

  194.     unsigned partitions_count;

  195.     MXFOP op;

  196.     UID *packages_refs;

  197.     int packages_count;

  198.     MXFMetadataSet **metadata_sets;

  199.     int metadata_sets_count;

  200.     AVFormatContext *fc;

  201.     struct AVAES *aesc;

  202.     uint8_t *local_tags;

  203.     int local_tags_count;

  204.     uint64_t footer_partition;

  205.     KLVPacket current_klv_data;

  206.     int current_klv_index;

  207.     int run_in;

  208.     MXFPartition *current_partition;

  209.     int parsing_backward;

  210.     int64_t last_forward_tell;

  211.     int last_forward_partition;

  212.     int current_edit_unit;

  213.     int current_stream;

  214.     int d10;

  215.     int broken_index;

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

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

  218.     int nb_ptses;

  219.     int nb_index_tables;

  220.     MXFIndexTable *index_tables;

  221. } MXFContext;

  222. 

  223. enum MXFWrappingScheme {

  224.     Frame,

  225.     Clip,

  226. };

  227. 

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

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

  230. 

  231. typedef struct {

  232.     const UID key;

  233.     MXFMetadataReadFunc *read;

  234.     int ctx_size;

  235.     enum MXFMetadataSetType type;

  236. } MXFMetadataReadTableEntry;

  237. 

  238. /* partial keys to match */

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

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

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

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

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

  244. /* complete keys to match */

  245. 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 };

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

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

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

  249. 

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

  251. 

  252. static int64_t klv_decode_ber_length(AVIOContext *pb)

  253. {

  254.     uint64_t size = avio_r8(pb);

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

  256.         int bytes_num = size & 0x7f;

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

  258.         if (bytes_num > 8)

  259.             return -1;

  260.         size = 0;

  261.         while (bytes_num--)

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

  263.     }

  264.     return size;

  265. }

  266. 

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

  268. {

  269.     int i, b;

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

  271.         b = avio_r8(pb);

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

  273.             i = 0;

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

  275.             i = -1;

  276.     }

  277.     return i == size;

  278. }

  279. 

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

  281. {

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

  283.         return -1;

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

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

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

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

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

  289. }

  290. 

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

  292. {

  293.     int i;

  294. 

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

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

  297.         /* SMPTE 379M 7.3 */

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

  299.             return i;

  300.     }

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

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

  303. }

  304. 

  305. /* XXX: use AVBitStreamFilter */

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

  307. {

  308.     const uint8_t *buf_ptr, *end_ptr;

  309.     uint8_t *data_ptr;

  310.     int i;

  311. 

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

  313.         return -1;

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

  315.     if (length < 0)

  316.         return length;

  317.     data_ptr = pkt->data;

  318.     end_ptr = pkt->data + length;

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

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

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

  322.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  325.             else

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

  327.         }

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

  329.     }

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

  331.     return 0;

  332. }

  333. 

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

  335. {

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

  337.     MXFContext *mxf = s->priv_data;

  338.     AVIOContext *pb = s->pb;

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

  340.     int64_t size;

  341.     uint64_t orig_size;

  342.     uint64_t plaintext_size;

  343.     uint8_t ivec[16];

  344.     uint8_t tmpbuf[16];

  345.     int index;

  346. 

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

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

  349.         if (!mxf->aesc)

  350.             return -1;

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

  352.     }

  353.     // crypto context

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

  355.     // plaintext offset

  356.     klv_decode_ber_length(pb);

  357.     plaintext_size = avio_rb64(pb);

  358.     // source klv key

  359.     klv_decode_ber_length(pb);

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

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

  362.         return -1;

  363.     index = mxf_get_stream_index(s, klv);

  364.     if (index < 0)

  365.         return -1;

  366.     // source size

  367.     klv_decode_ber_length(pb);

  368.     orig_size = avio_rb64(pb);

  369.     if (orig_size < plaintext_size)

  370.         return -1;

  371.     // enc. code

  372.     size = klv_decode_ber_length(pb);

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

  374.         return -1;

  375.     avio_read(pb, ivec, 16);

  376.     avio_read(pb, tmpbuf, 16);

  377.     if (mxf->aesc)

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

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

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

  381.     size -= 32;

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

  383.     if (size < 0)

  384.         return size;

  385.     else if (size < plaintext_size)

  386.         return AVERROR_INVALIDDATA;

  387.     size -= plaintext_size;

  388.     if (mxf->aesc)

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

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

  391.     av_shrink_packet(pkt, orig_size);

  392.     pkt->stream_index = index;

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

  394.     return 0;

  395. }

  396. 

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

  398. {

  399.     MXFContext *mxf = arg;

  400.     int item_num = avio_rb32(pb);

  401.     int item_len = avio_rb32(pb);

  402. 

  403.     if (item_len != 18) {

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

  405.         return -1;

  406.     }

  407.     if (item_num > UINT_MAX / item_len)

  408.         return -1;

  409.     mxf->local_tags_count = item_num;

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

  411.     if (!mxf->local_tags)

  412.         return -1;

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

  414.     return 0;

  415. }

  416. 

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

  418. {

  419.     MXFContext *mxf = arg;

  420.     MXFPartition *partition;

  421.     UID op;

  422.     uint64_t footer_partition;

  423. 

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

  425.         return AVERROR(ENOMEM);

  426. 

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

  428.     if (!mxf->partitions)

  429.         return AVERROR(ENOMEM);

  430. 

  431.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  438.     } else {

  439.         mxf->last_forward_partition++;

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

  441.     }

  442. 

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

  444.     mxf->partitions_count++;

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

  446. 

  447.     switch(uid[13]) {

  448.     case 2:

  449.         partition->type = Header;

  450.         break;

  451.     case 3:

  452.         partition->type = BodyPartition;

  453.         break;

  454.     case 4:

  455.         partition->type = Footer;

  456.         break;

  457.     default:

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

  459.         return AVERROR_INVALIDDATA;

  460.     }

  461. 

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

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

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

  465.     avio_skip(pb, 4);

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

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

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

  469.     footer_partition = avio_rb64(pb);

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

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

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

  473.     avio_skip(pb, 8);

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

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

  476. 

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

  478.     if (footer_partition) {

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

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

  481.                    mxf->footer_partition, footer_partition);

  482.         } else {

  483.             mxf->footer_partition = footer_partition;

  484.         }

  485.     }

  486. 

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

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

  489.             partition->this_partition,

  490.             partition->previous_partition, footer_partition,

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

  492. 

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

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

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

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

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

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

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

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

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

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

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

  504.     else {

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

  506.         mxf->op = OP1a;

  507.     }

  508. 

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

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

  511. 

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

  513.             partition->kag_size = 512;

  514.         else

  515.             partition->kag_size = 1;

  516. 

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

  518.     }

  519. 

  520.     return 0;

  521. }

  522. 

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

  524. {

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

  526.         return AVERROR(ENOMEM);

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

  528.     if (!mxf->metadata_sets)

  529.         return -1;

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

  531.     mxf->metadata_sets_count++;

  532.     return 0;

  533. }

  534. 

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

  536. {

  537.     MXFCryptoContext *cryptocontext = arg;

  538.     if (size != 16)

  539.         return -1;

  540.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  542.     return 0;

  543. }

  544. 

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

  546. {

  547.     MXFContext *mxf = arg;

  548.     switch (tag) {

  549.     case 0x1901:

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

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

  552.             return -1;

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

  554.         if (!mxf->packages_refs)

  555.             return -1;

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

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

  558.         break;

  559.     }

  560.     return 0;

  561. }

  562. 

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

  564. {

  565.     MXFStructuralComponent *source_clip = arg;

  566.     switch(tag) {

  567.     case 0x0202:

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

  569.         break;

  570.     case 0x1201:

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

  572.         break;

  573.     case 0x1101:

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

  575.         avio_skip(pb, 16);

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

  577.         break;

  578.     case 0x1102:

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

  580.         break;

  581.     }

  582.     return 0;

  583. }

  584. 

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

  586. {

  587.     MXFPackage *package = arg;

  588.     switch(tag) {

  589.     case 0x4403:

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

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

  592.             return -1;

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

  594.         if (!package->tracks_refs)

  595.             return -1;

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

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

  598.         break;

  599.     }

  600.     return 0;

  601. }

  602. 

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

  604. {

  605.     MXFTrack *track = arg;

  606.     switch(tag) {

  607.     case 0x4801:

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

  609.         break;

  610.     case 0x4804:

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

  612.         break;

  613.     case 0x4B01:

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

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

  616.         break;

  617.     case 0x4803:

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

  619.         break;

  620.     }

  621.     return 0;

  622. }

  623. 

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

  625. {

  626.     MXFSequence *sequence = arg;

  627.     switch(tag) {

  628.     case 0x0202:

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

  630.         break;

  631.     case 0x0201:

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

  633.         break;

  634.     case 0x1001:

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

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

  637.             return -1;

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

  639.         if (!sequence->structural_components_refs)

  640.             return -1;

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

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

  643.         break;

  644.     }

  645.     return 0;

  646. }

  647. 

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

  649. {

  650.     MXFPackage *package = arg;

  651.     switch(tag) {

  652.     case 0x4403:

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

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

  655.             return -1;

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

  657.         if (!package->tracks_refs)

  658.             return -1;

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

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

  661.         break;

  662.     case 0x4401:

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

  664.         avio_skip(pb, 16);

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

  666.         break;

  667.     case 0x4701:

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

  669.         break;

  670.     }

  671.     return 0;

  672. }

  673. 

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

  675. {

  676.     int i, length;

  677. 

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

  679.     length = avio_rb32(pb);

  680. 

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

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

  683.         return AVERROR(ENOMEM);

  684. 

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

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

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

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

  689.     }

  690.     return 0;

  691. }

  692. 

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

  694. {

  695.     int i, j, length;

  696. 

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

  698.     length = avio_rb32(pb);

  699. 

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

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

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

  703.         return AVERROR(ENOMEM);

  704. 

  705.     if (segment->slice_count &&

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

  707.         return AVERROR(ENOMEM);

  708. 

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

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

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

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

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

  714.         if (segment->slice_count) {

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

  716.                 return AVERROR(ENOMEM);

  717. 

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

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

  720.         }

  721. 

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

  723.     }

  724.     return 0;

  725. }

  726. 

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

  728. {

  729.     MXFIndexTableSegment *segment = arg;

  730.     switch(tag) {

  731.     case 0x3F05:

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

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

  734.         break;

  735.     case 0x3F06:

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

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

  738.         break;

  739.     case 0x3F07:

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

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

  742.         break;

  743.     case 0x3F08:

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

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

  746.         break;

  747.     case 0x3F09:

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

  749.         return mxf_read_delta_entry_array(pb, segment);

  750.     case 0x3F0A:

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

  752.         return mxf_read_index_entry_array(pb, segment);

  753.     case 0x3F0B:

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

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

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

  757.                 segment->index_edit_rate.den);

  758.         break;

  759.     case 0x3F0C:

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

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

  762.         break;

  763.     case 0x3F0D:

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

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

  766.         break;

  767.     }

  768.     return 0;

  769. }

  770. 

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

  772. {

  773.     int code, value, ofs = 0;

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

  775. 

  776.     do {

  777.         code = avio_r8(pb);

  778.         value = avio_r8(pb);

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

  780. 

  781.         if (ofs < 16) {

  782.             layout[ofs++] = code;

  783.             layout[ofs++] = value;

  784.         }

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

  786. 

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

  788. }

  789. 

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

  791. {

  792.     MXFDescriptor *descriptor = arg;

  793.     switch(tag) {

  794.     case 0x3F01:

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

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

  797.             return -1;

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

  799.         if (!descriptor->sub_descriptors_refs)

  800.             return -1;

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

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

  803.         break;

  804.     case 0x3004:

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

  806.         break;

  807.     case 0x3006:

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

  809.         break;

  810.     case 0x3201: /* PictureEssenceCoding */

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

  812.         break;

  813.     case 0x3203:

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

  815.         break;

  816.     case 0x3202:

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

  818.         break;

  819.     case 0x320E:

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

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

  822.         break;

  823.     case 0x3D03:

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

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

  826.         break;

  827.     case 0x3D06: /* SoundEssenceCompression */

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

  829.         break;

  830.     case 0x3D07:

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

  832.         break;

  833.     case 0x3D01:

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

  835.         break;

  836.     case 0x3401:

  837.         mxf_read_pixel_layout(pb, descriptor);

  838.         break;

  839.     default:

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

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

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

  843.             if (!descriptor->extradata)

  844.                 return -1;

  845.             descriptor->extradata_size = size;

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

  847.         }

  848.         break;

  849.     }

  850.     return 0;

  851. }

  852. 

  853. /*

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

  855.  * Returns: boolean

  856.  */

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

  858. {

  859.     int i;

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

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

  862.             return 0;

  863.     }

  864.     return 1;

  865. }

  866. 

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

  868. {

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

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

  871.             break;

  872.         uls++;

  873.     }

  874.     return uls;

  875. }

  876. 

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

  878. {

  879.     int i;

  880. 

  881.     if (!strong_ref)

  882.         return NULL;

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

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

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

  886.             return mxf->metadata_sets[i];

  887.         }

  888.     }

  889.     return NULL;

  890. }

  891. 

  892. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  893.     // video essence container uls

  894.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  895.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  896.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  897. };

  898. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  899.     // sound essence container uls

  900.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  901.     { { 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 */

  902.     { { 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 */

  903.     { { 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 */

  904.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  905. };

  906. 

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

  908. 

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

  910. {

  911.     int i, j, nb_segments = 0;

  912.     MXFIndexTableSegment **unsorted_segments;

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

  914. 

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

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

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

  918.             nb_segments++;

  919. 

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

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

  922.         av_free(unsorted_segments);

  923.         return AVERROR(ENOMEM);

  924.     }

  925. 

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

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

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

  929. 

  930.     *nb_sorted_segments = 0;

  931. 

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

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

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

  935. 

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

  937.             MXFIndexTableSegment *s = unsorted_segments[j];

  938. 

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

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

  941.              */

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

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

  944.                 best             = j;

  945.                 best_body_sid    = s->body_sid;

  946.                 best_index_sid   = s->index_sid;

  947.                 best_index_start = s->index_start_position;

  948.             }

  949.         }

  950. 

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

  952.         if (best == -1)

  953.             break;

  954. 

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

  956.         last_body_sid    = best_body_sid;

  957.         last_index_sid   = best_index_sid;

  958.         last_index_start = best_index_start;

  959.     }

  960. 

  961.     av_free(unsorted_segments);

  962. 

  963.     return 0;

  964. }

  965. 

  966. /**

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

  968.  */

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

  970. {

  971.     int x;

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

  973. 

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

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

  976. 

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

  978.             continue;

  979. 

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

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

  982.             return 0;

  983.         }

  984. 

  985.         offset -= p->essence_length;

  986.     }

  987. 

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

  989.            offset_in, body_sid);

  990. 

  991.     return AVERROR_INVALIDDATA;

  992. }

  993. 

  994. /**

  995.  * Returns the length of the essence container with given BodySID, or zero if unknown

  996.  */

  997. static int64_t mxf_essence_container_length(MXFContext *mxf, int body_sid)

  998. {

  999.     int x;

  1000.     int64_t ret = 0;

  1001. 

  1002.     for (x = 0; x < mxf->partitions_count; x++) {

  1003.         MXFPartition *p = &mxf->partitions[x];

  1004. 

  1005.         if (p->body_sid != body_sid)

  1006.             continue;

  1007. 

  1008.         if (!p->essence_length)

  1009.             return 0;

  1010. 

  1011.         ret += p->essence_length;

  1012.     }

  1013. 

  1014.     return ret;

  1015. }

  1016. 

  1017. static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st, MXFIndexTableSegment **sorted_segments, int nb_sorted_segments)

  1018. {

  1019.     int64_t accumulated_offset = 0;

  1020.     int j, k, l, ret;

  1021.     int n_delta = track_id - 1;  /* TrackID = 1-based stream index */

  1022. 

  1023.     if (track_id < 1) {

  1024.         av_log(mxf->fc, AV_LOG_ERROR, "TrackID not positive: %i\n", track_id);

  1025.         return AVERROR_INVALIDDATA;

  1026.     }

  1027. 

  1028.     for (j = 0; j < nb_sorted_segments; j++) {

  1029.         int duration, sample_duration = 1, last_sample_size = 0;

  1030.         int64_t segment_size;

  1031.         MXFIndexTableSegment *tableseg = sorted_segments[j];

  1032.         int index_delta = 1, last_size_unknown = 0;

  1033.         int64_t last_pos = 0;

  1034. 

  1035.         /* reset accumulated_offset on BodySID change */

  1036.         if (j > 0 && tableseg->body_sid != sorted_segments[j-1]->body_sid)

  1037.             accumulated_offset = 0;

  1038. 

  1039.         if (tableseg->nb_index_entries == 2 * tableseg->index_duration + 1) {

  1040.             /* Avid index - duplicate entries and total size as last entry */

  1041.             index_delta = 2;

  1042.         }

  1043. 

  1044.         if (n_delta >= tableseg->nb_delta_entries && st->index != 0)

  1045.             continue;

  1046.         duration = tableseg->index_duration > 0 ? tableseg->index_duration :

  1047.             st->duration - st->nb_index_entries;

  1048.         segment_size = tableseg->edit_unit_byte_count * duration;

  1049.         /* check small EditUnitByteCount for audio */

  1050.         if (tableseg->edit_unit_byte_count && tableseg->edit_unit_byte_count < 32

  1051.             && !tableseg->index_duration) {

  1052.             /* duration might be prime relative to the new sample_duration,

  1053.              * which means we need to handle the last frame differently */

  1054.             sample_duration = 8192;

  1055.             last_sample_size = (duration % sample_duration) * tableseg->edit_unit_byte_count;

  1056.             tableseg->edit_unit_byte_count *= sample_duration;

  1057.             duration /= sample_duration;

  1058.             if (last_sample_size) duration++;

  1059.         }

  1060. 

  1061.         if (duration <= 0) {

  1062.             av_log(mxf->fc, AV_LOG_WARNING, "0 duration in index for stream %i\n", st->index);

  1063.             mxf->broken_index = 1;

  1064.             return 0;

  1065.         }

  1066. 

  1067.         for (k = l = 0; k < duration; k++, l += index_delta) {

  1068.             int64_t pos;

  1069.             int size, flags = 0;

  1070. 

  1071.             if (l < tableseg->nb_index_entries) {

  1072.                 pos = tableseg->stream_offset_entries[l];

  1073.                 if (n_delta < tableseg->nb_delta_entries) {

  1074.                     if (n_delta < tableseg->nb_delta_entries - 1) {

  1075.                         size =

  1076.                             tableseg->slice_offset_entries[l][tableseg->slice[n_delta+1]-1] +

  1077.                             tableseg->element_delta[n_delta+1] -

  1078.                             tableseg->element_delta[n_delta];

  1079.                         if (tableseg->slice[n_delta] > 0)

  1080.                             size -= tableseg->slice_offset_entries[l][tableseg->slice[n_delta]-1];

  1081.                     } else if (l < tableseg->nb_index_entries - 1) {

  1082.                         size = tableseg->stream_offset_entries[l+1] -

  1083.                             tableseg->stream_offset_entries[l] -

  1084.                             tableseg->slice_offset_entries[l][tableseg->slice[tableseg->nb_delta_entries-1]-1] -

  1085.                             tableseg->element_delta[tableseg->nb_delta_entries-1];

  1086.                     } else

  1087.                         size = 0;

  1088.                     if (tableseg->slice[n_delta] > 0)

  1089.                         pos += tableseg->slice_offset_entries[l][tableseg->slice[n_delta]-1];

  1090.                     pos += tableseg->element_delta[n_delta];

  1091.                 } else

  1092.                     size = 0;

  1093.                 flags = !(tableseg->flag_entries[l] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1094.             } else {

  1095.                 pos = (int64_t)k * tableseg->edit_unit_byte_count + accumulated_offset;

  1096.                 if (n_delta < tableseg->nb_delta_entries - 1)

  1097.                     size = tableseg->element_delta[n_delta+1] - tableseg->element_delta[n_delta];

  1098.                 else {

  1099.                     /* use smaller size for last sample if we should */

  1100.                     if (last_sample_size && k == duration - 1)

  1101.                         size = last_sample_size;

  1102.                     else

  1103.                         size = tableseg->edit_unit_byte_count;

  1104.                     if (tableseg->nb_delta_entries)

  1105.                         size -= tableseg->element_delta[tableseg->nb_delta_entries-1];

  1106.                 }

  1107.                 if (n_delta < tableseg->nb_delta_entries)

  1108.                     pos += tableseg->element_delta[n_delta];

  1109.                 flags = AVINDEX_KEYFRAME;

  1110.             }

  1111. 

  1112.             if (last_size_unknown)

  1113.                 st->index_entries[st->nb_index_entries-1].size = pos - last_pos;

  1114. 

  1115.             last_size_unknown = size == 0;

  1116.             last_pos = pos;

  1117. 

  1118.             if (mxf_absolute_bodysid_offset(mxf, tableseg->body_sid, pos, &pos) < 0) {

  1119.                 /* probably partial file - no point going further for this stream */

  1120.                 break;

  1121.             }

  1122. 

  1123.             av_dlog(mxf->fc, "Stream %d IndexEntry %d TrackID %d Offset %"PRIx64" Timestamp %"PRId64"\n",

  1124.                     st->index, st->nb_index_entries, track_id, pos, sample_duration * st->nb_index_entries);

  1125. 

  1126.             if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)

  1127.                 return ret;

  1128.         }

  1129. 

  1130.         if (last_size_unknown) {

  1131.             int64_t ecl = mxf_essence_container_length(mxf, tableseg->body_sid);

  1132. 

  1133.             if (ecl > 0)

  1134.                 st->index_entries[st->nb_index_entries-1].size = ecl - last_pos;

  1135.         }

  1136. 

  1137.         accumulated_offset += segment_size;

  1138.     }

  1139. 

  1140.     return 0;

  1141. }

  1142. 

  1143. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1144. {

  1145.     int i, j, x;

  1146.     int8_t max_temporal_offset = -128;

  1147. 

  1148.     /* first compute how many entries we have */

  1149.     for (i = 0; i < index_table->nb_segments; i++) {

  1150.         MXFIndexTableSegment *s = index_table->segments[i];

  1151. 

  1152.         if (!s->nb_index_entries)

  1153.             return 0;                               /* no TemporalOffsets */

  1154. 

  1155.         index_table->nb_ptses += s->index_duration;

  1156.     }

  1157. 

  1158.     /* paranoid check */

  1159.     if (index_table->nb_ptses <= 0)

  1160.         return 0;

  1161. 

  1162.     if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||

  1163.         !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {

  1164.         av_freep(&index_table->ptses);

  1165.         return AVERROR(ENOMEM);

  1166.     }

  1167. 

  1168.     /* we may have a few bad TemporalOffsets

  1169.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1170.     for (x = 0; x < index_table->nb_ptses; x++)

  1171.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1172. 

  1173.     /**

  1174.      * We have this:

  1175.      *

  1176.      * x  TemporalOffset

  1177.      * 0:  0

  1178.      * 1:  1

  1179.      * 2:  1

  1180.      * 3: -2

  1181.      * 4:  1

  1182.      * 5:  1

  1183.      * 6: -2

  1184.      *

  1185.      * We want to transform it into this:

  1186.      *

  1187.      * x  DTS PTS

  1188.      * 0: -1   0

  1189.      * 1:  0   3

  1190.      * 2:  1   1

  1191.      * 3:  2   2

  1192.      * 4:  3   6

  1193.      * 5:  4   4

  1194.      * 6:  5   5

  1195.      *

  1196.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1197.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1198.      * The latter makes DTS <= PTS.

  1199.      */

  1200.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1201.         MXFIndexTableSegment *s = index_table->segments[i];

  1202.         int index_delta = 1;

  1203. 

  1204.         if (s->nb_index_entries == 2 * s->index_duration + 1)

  1205.             index_delta = 2;    /* Avid index */

  1206. 

  1207.         for (j = 0; j < s->nb_index_entries; j += index_delta, x++) {

  1208.             int offset = s->temporal_offset_entries[j] / index_delta;

  1209.             int index  = x + offset;

  1210. 

  1211.             index_table->fake_index[x].timestamp = x;

  1212.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1213. 

  1214.             if (index < 0 || index >= index_table->nb_ptses) {

  1215.                 av_log(mxf->fc, AV_LOG_ERROR,

  1216.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1217.                        x, offset, index);

  1218.                 continue;

  1219.             }

  1220. 

  1221.             index_table->ptses[index] = x;

  1222.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1223.         }

  1224.     }

  1225. 

  1226.     index_table->first_dts = -max_temporal_offset;

  1227. 

  1228.     return 0;

  1229. }

  1230. 

  1231. /**

  1232.  * Sorts and collects index table segments into index tables.

  1233.  * Also computes PTSes if possible.

  1234.  */

  1235. static int mxf_compute_index_tables(MXFContext *mxf)

  1236. {

  1237.     int i, j, k, ret, nb_sorted_segments;

  1238.     MXFIndexTableSegment **sorted_segments = NULL;

  1239. 

  1240.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1241.         nb_sorted_segments <= 0) {

  1242.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1243.         return 0;

  1244.     }

  1245. 

  1246.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1247.     for (i = 0; i < nb_sorted_segments; i++) {

  1248.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1249.             mxf->nb_index_tables++;

  1250.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1251.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1252.             ret = AVERROR_INVALIDDATA;

  1253.             goto finish_decoding_index;

  1254.         }

  1255.     }

  1256. 

  1257.     if (!(mxf->index_tables = av_calloc(mxf->nb_index_tables, sizeof(MXFIndexTable)))) {

  1258.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1259.         ret = AVERROR(ENOMEM);

  1260.         goto finish_decoding_index;

  1261.     }

  1262. 

  1263.     /* distribute sorted segments to index tables */

  1264.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1265.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1266.             /* next IndexSID */

  1267.             j++;

  1268.         }

  1269. 

  1270.         mxf->index_tables[j].nb_segments++;

  1271.     }

  1272. 

  1273.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1274.         MXFIndexTable *t = &mxf->index_tables[j];

  1275. 

  1276.         if (!(t->segments = av_calloc(t->nb_segments, sizeof(MXFIndexTableSegment*)))) {

  1277.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment pointer array\n");

  1278.             ret = AVERROR(ENOMEM);

  1279.             goto finish_decoding_index;

  1280.         }

  1281. 

  1282.         if (sorted_segments[i]->index_start_position)

  1283.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1284.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1285. 

  1286.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1287.         t->index_sid = sorted_segments[i]->index_sid;

  1288.         t->body_sid = sorted_segments[i]->body_sid;

  1289. 

  1290.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1291.             goto finish_decoding_index;

  1292. 

  1293.         /* fix zero IndexDurations */

  1294.         for (k = 0; k < t->nb_segments; k++) {

  1295.             if (t->segments[k]->index_duration)

  1296.                 continue;

  1297. 

  1298.             if (t->nb_segments > 1)

  1299.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1300.                        t->index_sid, k);

  1301. 

  1302.             if (mxf->fc->nb_streams <= 0) {

  1303.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1304.                 break;

  1305.             }

  1306. 

  1307.             /* assume the first stream's duration is reasonable

  1308.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1309.              */

  1310.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1311.             break;

  1312.         }

  1313.     }

  1314. 

  1315.     ret = 0;

  1316. finish_decoding_index:

  1317.     av_free(sorted_segments);

  1318.     return ret;

  1319. }

  1320. 

  1321. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1322. {

  1323.     MXFPackage *material_package = NULL;

  1324.     MXFPackage *temp_package = NULL;

  1325.     int i, j, k, ret, nb_sorted_segments;

  1326.     MXFIndexTableSegment **sorted_segments = NULL;

  1327. 

  1328.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1329.     /* TODO: handle multiple material packages (OP3x) */

  1330.     for (i = 0; i < mxf->packages_count; i++) {

  1331.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1332.         if (material_package) break;

  1333.     }

  1334.     if (!material_package) {

  1335.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1336.         return -1;

  1337.     }

  1338. 

  1339.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1340.         nb_sorted_segments <= 0) {

  1341.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1342.         mxf->broken_index = 1;

  1343.     }

  1344. 

  1345.     for (i = 0; i < material_package->tracks_count; i++) {

  1346.         MXFPackage *source_package = NULL;

  1347.         MXFTrack *material_track = NULL;

  1348.         MXFTrack *source_track = NULL;

  1349.         MXFTrack *temp_track = NULL;

  1350.         MXFDescriptor *descriptor = NULL;

  1351.         MXFStructuralComponent *component = NULL;

  1352.         UID *essence_container_ul = NULL;

  1353.         const MXFCodecUL *codec_ul = NULL;

  1354.         const MXFCodecUL *container_ul = NULL;

  1355.         AVStream *st;

  1356. 

  1357.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1358.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1359.             continue;

  1360.         }

  1361. 

  1362.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1363.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1364.             continue;

  1365.         }

  1366. 

  1367.         /* TODO: handle multiple source clips */

  1368.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1369.             /* TODO: handle timecode component */

  1370.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1371.             if (!component)

  1372.                 continue;

  1373. 

  1374.             for (k = 0; k < mxf->packages_count; k++) {

  1375.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1376.                 if (!temp_package)

  1377.                     continue;

  1378.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1379.                     source_package = temp_package;

  1380.                     break;

  1381.                 }

  1382.             }

  1383.             if (!source_package) {

  1384.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1385.                 break;

  1386.             }

  1387.             for (k = 0; k < source_package->tracks_count; k++) {

  1388.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1389.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1390.                     ret = -1;

  1391.                     goto fail_and_free;

  1392.                 }

  1393.                 if (temp_track->track_id == component->source_track_id) {

  1394.                     source_track = temp_track;

  1395.                     break;

  1396.                 }

  1397.             }

  1398.             if (!source_track) {

  1399.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1400.                 break;

  1401.             }

  1402.         }

  1403.         if (!source_track)

  1404.             continue;

  1405. 

  1406.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1407.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1408.             ret = -1;

  1409.             goto fail_and_free;

  1410.         }

  1411. 

  1412.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1413.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1414.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1415.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1416.             continue;

  1417.         }

  1418. 

  1419.         st = avformat_new_stream(mxf->fc, NULL);

  1420.         if (!st) {

  1421.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1422.             ret = AVERROR(ENOMEM);

  1423.             goto fail_and_free;

  1424.         }

  1425.         st->id = source_track->track_id;

  1426.         st->priv_data = source_track;

  1427.         st->duration = component->duration;

  1428.         if (st->duration == -1)

  1429.             st->duration = AV_NOPTS_VALUE;

  1430.         st->start_time = component->start_position;

  1431.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1432. 

  1433.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1434.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1435.         st->codec->codec_type = codec_ul->id;

  1436. 

  1437.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1438.         if (source_package->descriptor) {

  1439.             if (source_package->descriptor->type == MultipleDescriptor) {

  1440.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1441.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1442. 

  1443.                     if (!sub_descriptor) {

  1444.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1445.                         continue;

  1446.                     }

  1447.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1448.                         descriptor = sub_descriptor;

  1449.                         break;

  1450.                     }

  1451.                 }

  1452.             } else if (source_package->descriptor->type == Descriptor)

  1453.                 descriptor = source_package->descriptor;

  1454.         }

  1455.         if (!descriptor) {

  1456.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1457.             continue;

  1458.         }

  1459.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1460.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1461.         essence_container_ul = &descriptor->essence_container_ul;

  1462.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1463.          * is not allowed according to s429-6, try to find correct information anyway */

  1464.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1465.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1466.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1467.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1468.                 if (metadata->type == CryptoContext) {

  1469.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1470.                     break;

  1471.                 }

  1472.             }

  1473.         }

  1474. 

  1475.         /* HACK: revert to the old demuxing/seeking scode for D-10 for now */

  1476.         if (mxf_match_uid(essence_container_ul, mxf_d10_ul, 14))

  1477.             mxf->d10 = 1;

  1478. 

  1479.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1480.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1481.         st->codec->codec_id = codec_ul->id;

  1482.         if (descriptor->extradata) {

  1483.             st->codec->extradata = descriptor->extradata;

  1484.             st->codec->extradata_size = descriptor->extradata_size;

  1485.         }

  1486.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1487.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1488.             if (st->codec->codec_id == CODEC_ID_NONE)

  1489.                 st->codec->codec_id = container_ul->id;

  1490.             st->codec->width = descriptor->width;

  1491.             st->codec->height = descriptor->height;

  1492.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1493.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1494.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1495.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1496.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1497.             if (st->codec->codec_id == CODEC_ID_NONE)

  1498.                 st->codec->codec_id = container_ul->id;

  1499.             st->codec->channels = descriptor->channels;

  1500.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1501.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1502.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1503.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1504.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1505.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1506.                 else if (descriptor->bits_per_sample == 32)

  1507.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1508.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1509.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1510.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1511.                 else if (descriptor->bits_per_sample == 32)

  1512.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1513.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1514.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1515.             }

  1516.         }

  1517.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1518.             /* TODO: decode timestamps */

  1519.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1520.         }

  1521. 

  1522.         if (!mxf->broken_index &&

  1523.             (ret = mxf_parse_index(mxf, material_track->track_id, st, sorted_segments, nb_sorted_segments)))

  1524.             goto fail_and_free;

  1525.     }

  1526. 

  1527.     ret = 0;

  1528. fail_and_free:

  1529.     av_free(sorted_segments);

  1530.     return ret;

  1531. }

  1532. 

  1533. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1534.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1535.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1536.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1537.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1538.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1539.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1540.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1541.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1542.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1543.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1544.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1545.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1546.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1547.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1548.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1549.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1550.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1551.     { { 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 */

  1552.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1553.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1554.     { { 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 */

  1555.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1556.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1557.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1558.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1559.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1560.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1561.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1562. };

  1563. 

  1564. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1565. {

  1566.     AVIOContext *pb = mxf->fc->pb;

  1567.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1568.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1569. 

  1570.     if (!ctx)

  1571.         return -1;

  1572.     while (avio_tell(pb) + 4 < klv_end) {

  1573.         int tag = avio_rb16(pb);

  1574.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1575.         uint64_t next = avio_tell(pb) + size;

  1576.         UID uid = {0};

  1577. 

  1578.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1579.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1580.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1581.             continue;

  1582.         }

  1583.         if (tag > 0x7FFF) { /* dynamic tag */

  1584.             int i;

  1585.             for (i = 0; i < mxf->local_tags_count; i++) {

  1586.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1587.                 if (local_tag == tag) {

  1588.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1589.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1590.                     PRINT_KEY(mxf->fc, "uid", uid);

  1591.                 }

  1592.             }

  1593.         }

  1594.         if (ctx_size && tag == 0x3C0A)

  1595.             avio_read(pb, ctx->uid, 16);

  1596.         else if (read_child(ctx, pb, tag, size, uid, -1) < 0)

  1597.             return -1;

  1598. 

  1599.         avio_seek(pb, next, SEEK_SET);

  1600.     }

  1601.     if (ctx_size) ctx->type = type;

  1602.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1603. }

  1604. 

  1605. /**

  1606.  * Seeks to the previous partition, if possible

  1607.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1608.  */

  1609. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1610. {

  1611.     AVIOContext *pb = mxf->fc->pb;

  1612. 

  1613.     if (!mxf->current_partition ||

  1614.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1615.         return 0;   /* we've parsed all partitions */

  1616. 

  1617.     /* seek to previous partition */

  1618.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1619.     mxf->current_partition = NULL;

  1620. 

  1621.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1622. 

  1623.     return 1;

  1624. }

  1625. 

  1626. /**

  1627.  * Called when essence is encountered

  1628.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1629.  */

  1630. static int mxf_parse_handle_essence(MXFContext *mxf)

  1631. {

  1632.     AVIOContext *pb = mxf->fc->pb;

  1633.     int64_t ret;

  1634. 

  1635.     if (!mxf->current_partition) {

  1636.         av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to PartitionPack\n");

  1637.         return AVERROR_INVALIDDATA;

  1638.     }

  1639. 

  1640.     if (mxf->parsing_backward) {

  1641.         return mxf_seek_to_previous_partition(mxf);

  1642.     } else {

  1643.         if (!mxf->footer_partition) {

  1644.             av_dlog(mxf->fc, "no footer\n");

  1645.             return 0;

  1646.         }

  1647. 

  1648.         av_dlog(mxf->fc, "seeking to footer\n");

  1649. 

  1650.         /* remember where we were so we don't end up seeking further back than this */

  1651.         mxf->last_forward_tell = avio_tell(pb);

  1652. 

  1653.         if (!pb->seekable) {

  1654.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1655.             return -1;

  1656.         }

  1657. 

  1658.         /* seek to footer partition and parse backward */

  1659.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1660.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1661.                    mxf->run_in + mxf->footer_partition, ret);

  1662.             return ret;

  1663.         }

  1664. 

  1665.         mxf->current_partition = NULL;

  1666.         mxf->parsing_backward = 1;

  1667.     }

  1668. 

  1669.     return 1;

  1670. }

  1671. 

  1672. /**

  1673.  * Called when the next partition or EOF is encountered

  1674.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1675.  */

  1676. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1677. {

  1678.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1679. }

  1680. 

  1681. /**

  1682.  * Figures out the proper offset and length of the essence container in each partition

  1683.  */

  1684. static void mxf_compute_essence_containers(MXFContext *mxf)

  1685. {

  1686.     int x;

  1687. 

  1688.     /* everything is already correct */

  1689.     if (mxf->op == OPAtom)

  1690.         return;

  1691. 

  1692.     for (x = 0; x < mxf->partitions_count; x++) {

  1693.         MXFPartition *p = &mxf->partitions[x];

  1694. 

  1695.         if (!p->body_sid)

  1696.             continue;       /* BodySID == 0 -> no essence */

  1697. 

  1698.         if (x >= mxf->partitions_count - 1)

  1699.             break;          /* last partition - can't compute length (and we don't need to) */

  1700. 

  1701.         /* essence container spans to the next partition */

  1702.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1703. 

  1704.         if (p->essence_length < 0) {

  1705.             /* next ThisPartition < essence_offset */

  1706.             p->essence_length = 0;

  1707.             av_log(mxf->fc, AV_LOG_ERROR, "partition %i: bad ThisPartition = %lx\n",

  1708.                    x+1, mxf->partitions[x+1].this_partition);

  1709.         }

  1710.     }

  1711. }

  1712. 

  1713. static int64_t round_to_kag(int64_t position, int kag_size)

  1714. {

  1715.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1716.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1717.     int64_t ret = (position / kag_size) * kag_size;

  1718.     return ret == position ? ret : ret + kag_size;

  1719. }

  1720. 

  1721. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1722. {

  1723.     MXFContext *mxf = s->priv_data;

  1724.     KLVPacket klv;

  1725.     int64_t essence_offset = 0;

  1726.     int ret;

  1727. 

  1728.     mxf->last_forward_tell = INT64_MAX;

  1729. 

  1730.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1731.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1732.         return -1;

  1733.     }

  1734.     avio_seek(s->pb, -14, SEEK_CUR);

  1735.     mxf->fc = s;

  1736.     mxf->run_in = avio_tell(s->pb);

  1737. 

  1738.     while (!url_feof(s->pb)) {

  1739.         const MXFMetadataReadTableEntry *metadata;

  1740. 

  1741.         if (klv_read_packet(&klv, s->pb) < 0) {

  1742.             /* EOF - seek to previous partition or stop */

  1743.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1744.                 break;

  1745.             else

  1746.                 continue;

  1747.         }

  1748. 

  1749.         PRINT_KEY(s, "read header", klv.key);

  1750.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1751.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1752.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1753.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1754.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1755.             if (!mxf->current_partition->essence_offset) {

  1756.                 /* for OP1a we compute essence_offset

  1757.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1758.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1759.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1760.                  */

  1761.                 int64_t op1a_essence_offset =

  1762.                     round_to_kag(mxf->current_partition->this_partition +

  1763.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1764.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1765.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1766. 

  1767.                 if (mxf->op == OPAtom) {

  1768.                     /* point essence_offset to the actual data

  1769.                     * OPAtom has all the essence in one big KLV

  1770.                     */

  1771.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1772.                     mxf->current_partition->essence_length = klv.length;

  1773.                 } else {

  1774.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1775.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1776.                 }

  1777.             }

  1778. 

  1779.             if (!essence_offset)

  1780.                 essence_offset = klv.offset;

  1781. 

  1782.             /* seek to footer, previous partition or stop */

  1783.             if (mxf_parse_handle_essence(mxf) <= 0)

  1784.                 break;

  1785.             continue;

  1786.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1787.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1788.             /* next partition pack - keep going, seek to previous partition or stop */

  1789.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1790.                 break;

  1791.         }

  1792. 

  1793.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1794.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1795.                 int res;

  1796.                 if (klv.key[5] == 0x53) {

  1797.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1798.                 } else {

  1799.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1800.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1801.                     avio_seek(s->pb, next, SEEK_SET);

  1802.                 }

  1803.                 if (res < 0) {

  1804.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1805.                     return -1;

  1806.                 }

  1807.                 break;

  1808.             }

  1809.         }

  1810.         if (!metadata->read)

  1811.             avio_skip(s->pb, klv.length);

  1812.     }

  1813.     /* FIXME avoid seek */

  1814.     if (!essence_offset)  {

  1815.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1816.         return AVERROR_INVALIDDATA;

  1817.     }

  1818.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1819. 

  1820.     mxf_compute_essence_containers(mxf);

  1821. 

  1822.     /* we need to do this before computing the index tables

  1823.      * to be able to fill in zero IndexDurations with st->duration */

  1824.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1825.         return ret;

  1826. 

  1827.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1828.         return ret;

  1829. 

  1830.     if (mxf->nb_index_tables > 1) {

  1831.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1832.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1833.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1834.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1835.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1836.         return AVERROR_INVALIDDATA;

  1837.     }

  1838. 

  1839.     return 0;

  1840. }

  1841. 

  1842. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1843. {

  1844.     KLVPacket klv;

  1845. 

  1846.     while (!url_feof(s->pb)) {

  1847.         if (klv_read_packet(&klv, s->pb) < 0)

  1848.             return -1;

  1849.         PRINT_KEY(s, "read packet", klv.key);

  1850.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1851.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1852.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  1853.             if (res < 0) {

  1854.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1855.                 return -1;

  1856.             }

  1857.             return 0;

  1858.         }

  1859.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1860.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  1861.             int index = mxf_get_stream_index(s, &klv);

  1862.             if (index < 0) {

  1863.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  1864.                 goto skip;

  1865.             }

  1866.             if (s->streams[index]->discard == AVDISCARD_ALL)

  1867.                 goto skip;

  1868.             /* check for 8 channels AES3 element */

  1869.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  1870.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  1871.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  1872.                     return -1;

  1873.                 }

  1874.             } else {

  1875.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  1876.                 if (ret < 0)

  1877.                     return ret;

  1878.             }

  1879.             pkt->stream_index = index;

  1880.             pkt->pos = klv.offset;

  1881.             return 0;

  1882.         } else

  1883.         skip:

  1884.             avio_skip(s->pb, klv.length);

  1885.     }

  1886.     return AVERROR_EOF;

  1887. }

  1888. 

  1889. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1890. {

  1891.     MXFContext *mxf = s->priv_data;

  1892.     AVIndexEntry *e;

  1893.     int ret;

  1894.     int64_t ret64;

  1895.     KLVPacket klv;

  1896.     AVStream *st;

  1897. 

  1898.     /* TODO: better logic for this?

  1899.      * only files that lack all index segments prior to the essence need this */

  1900.     if (!s->pb->seekable && mxf->op != OPAtom || mxf->d10 || mxf->broken_index)

  1901.         return mxf_read_packet_old(s, pkt);

  1902. 

  1903.     if (mxf->current_stream >= s->nb_streams) {

  1904.         mxf->current_edit_unit++;

  1905.         mxf->current_stream = 0;

  1906.     }

  1907. 

  1908.     st = s->streams[mxf->current_stream];

  1909. 

  1910.     if (mxf->current_edit_unit >= st->nb_index_entries)

  1911.         return AVERROR_EOF;

  1912. 

  1913.     e = &st->index_entries[mxf->current_edit_unit];

  1914. 

  1915.     if ((ret64 = avio_seek(s->pb, e->pos, SEEK_SET)) < 0)

  1916.         return ret64;

  1917. 

  1918.     if (mxf->op == OPAtom) {

  1919.         /* OPAtom - no KL, just essence */

  1920.         if ((ret = av_get_packet(s->pb, pkt, e->size)) != e->size)

  1921.             return ret < 0 ? ret : AVERROR_EOF;

  1922.     } else {

  1923.         /* read KL, read L bytes of essence */

  1924.         if ((ret = klv_read_packet(&klv, s->pb)) < 0)

  1925.             return ret;

  1926. 

  1927.         /* untested, but looks OK */

  1928.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1929.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  1930.             if (res < 0) {

  1931.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1932.                 return -1;

  1933.             }

  1934.             return 0;

  1935.         }

  1936. 

  1937.         if ((ret = av_get_packet(s->pb, pkt, klv.length)) != klv.length)

  1938.             return ret < 0 ? ret : AVERROR_EOF;

  1939. 

  1940.         pkt->pos = e->pos;

  1941.     }

  1942. 

  1943.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && mxf->ptses && mxf->current_edit_unit < mxf->nb_ptses) {

  1944.         pkt->dts = mxf->current_edit_unit + mxf->first_dts;

  1945.         pkt->pts = mxf->ptses[mxf->current_edit_unit];

  1946.     }

  1947. 

  1948.     pkt->stream_index = mxf->current_stream++;

  1949. 

  1950.     return 0;

  1951. }

  1952. 

  1953. static int mxf_read_close(AVFormatContext *s)

  1954. {

  1955.     MXFContext *mxf = s->priv_data;

  1956.     MXFIndexTableSegment *seg;

  1957.     int i, j;

  1958. 

  1959.     av_freep(&mxf->packages_refs);

  1960. 

  1961.     for (i = 0; i < s->nb_streams; i++)

  1962.         s->streams[i]->priv_data = NULL;

  1963. 

  1964.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1965.         switch (mxf->metadata_sets[i]->type) {

  1966.         case MultipleDescriptor:

  1967.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1968.             break;

  1969.         case Sequence:

  1970.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1971.             break;

  1972.         case SourcePackage:

  1973.         case MaterialPackage:

  1974.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1975.             break;

  1976.         case IndexTableSegment:

  1977.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1978.             if (seg->slice_count)

  1979.             for (j = 0; j < seg->nb_index_entries; j++)

  1980.                 av_freep(&seg->slice_offset_entries[j]);

  1981.             av_freep(&seg->slice);

  1982.             av_freep(&seg->element_delta);

  1983.             av_freep(&seg->temporal_offset_entries);

  1984.             av_freep(&seg->flag_entries);

  1985.             av_freep(&seg->stream_offset_entries);

  1986.             av_freep(&seg->slice_offset_entries);

  1987.             break;

  1988.         default:

  1989.             break;

  1990.         }

  1991.         av_freep(&mxf->metadata_sets[i]);

  1992.     }

  1993.     av_freep(&mxf->partitions);

  1994.     av_freep(&mxf->metadata_sets);

  1995.     av_freep(&mxf->aesc);

  1996.     av_freep(&mxf->local_tags);

  1997.     av_freep(&mxf->ptses);

  1998. 

  1999.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2000.         av_freep(&mxf->index_tables[i].segments);

  2001.         av_freep(&mxf->index_tables[i].fake_index);

  2002.     }

  2003.     av_freep(&mxf->index_tables);

  2004. 

  2005.     return 0;

  2006. }

  2007. 

  2008. static int mxf_probe(AVProbeData *p) {

  2009.     uint8_t *bufp = p->buf;

  2010.     uint8_t *end = p->buf + p->buf_size;

  2011. 

  2012.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2013.         return 0;

  2014. 

  2015.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2016.     end -= sizeof(mxf_header_partition_pack_key);

  2017.     for (; bufp < end; bufp++) {

  2018.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2019.             return AVPROBE_SCORE_MAX;

  2020.     }

  2021.     return 0;

  2022. }

  2023. 

  2024. /* rudimentary byte seek */

  2025. /* XXX: use MXF Index */

  2026. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2027. {

  2028.     AVStream *st = s->streams[stream_index];

  2029.     int64_t seconds;

  2030.     MXFContext* mxf = s->priv_data;

  2031.     int64_t seekpos;

  2032.     int index;

  2033. 

  2034.     if (mxf->d10) {

  2035.     if (!s->bit_rate)

  2036.         return -1;

  2037.     if (sample_time < 0)

  2038.         sample_time = 0;

  2039.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2040.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  2041.         return -1;

  2042.     ff_update_cur_dts(s, st, sample_time);

  2043.     } else {

  2044.         if (st->nb_index_entries <= 0)

  2045.             return -1;

  2046. 

  2047.         index = av_index_search_timestamp(st, sample_time, flags);

  2048. 

  2049.         av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, sample_time, index);

  2050. 

  2051.         if (index < 0) {

  2052.             if (sample_time < st->index_entries[0].timestamp)

  2053.                 index = 0;

  2054.             else

  2055.                 return -1;

  2056.         }

  2057. 

  2058.         seekpos = st->index_entries[index].pos;

  2059.         av_update_cur_dts(s, st, st->index_entries[index].timestamp);

  2060.         mxf->current_edit_unit = st->index_entries[index].timestamp;

  2061.         mxf->current_stream = 0;

  2062.         avio_seek(s->pb, seekpos, SEEK_SET);

  2063.     }

  2064.     return 0;

  2065. }

  2066. 

  2067. AVInputFormat ff_mxf_demuxer = {

  2068.     .name           = "mxf",

  2069.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  2070.     .priv_data_size = sizeof(MXFContext),

  2071.     .read_probe     = mxf_probe,

  2072.     .read_header    = mxf_read_header,

  2073.     .read_packet    = mxf_read_packet,

  2074.     .read_close     = mxf_read_close,

  2075.     .read_seek      = mxf_read_seek,

  2076. };