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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 = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

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

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124. } MXFTrack;

  125. 

  126. typedef struct {

  127.     UID uid;

  128.     enum MXFMetadataSetType type;

  129.     UID essence_container_ul;

  130.     UID essence_codec_ul;

  131.     AVRational sample_rate;

  132.     AVRational aspect_ratio;

  133.     int width;

  134.     int height;

  135.     int channels;

  136.     int bits_per_sample;

  137.     UID *sub_descriptors_refs;

  138.     int sub_descriptors_count;

  139.     int linked_track_id;

  140.     uint8_t *extradata;

  141.     int extradata_size;

  142.     enum PixelFormat pix_fmt;

  143. } MXFDescriptor;

  144. 

  145. typedef struct {

  146.     UID uid;

  147.     enum MXFMetadataSetType type;

  148.     int edit_unit_byte_count;

  149.     int index_sid;

  150.     int body_sid;

  151.     AVRational index_edit_rate;

  152.     uint64_t index_start_position;

  153.     uint64_t index_duration;

  154.     int8_t *temporal_offset_entries;

  155.     int *flag_entries;

  156.     uint64_t *stream_offset_entries;

  157.     int nb_index_entries;

  158. } MXFIndexTableSegment;

  159. 

  160. typedef struct {

  161.     UID uid;

  162.     enum MXFMetadataSetType type;

  163.     UID package_uid;

  164.     UID *tracks_refs;

  165.     int tracks_count;

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

  167.     UID descriptor_ref;

  168. } MXFPackage;

  169. 

  170. typedef struct {

  171.     UID uid;

  172.     enum MXFMetadataSetType type;

  173. } MXFMetadataSet;

  174. 

  175. /* decoded index table */

  176. typedef struct {

  177.     int index_sid;

  178.     int body_sid;

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

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

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

  182.     int nb_segments;

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

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

  185. } MXFIndexTable;

  186. 

  187. typedef struct {

  188.     MXFPartition *partitions;

  189.     unsigned partitions_count;

  190.     MXFOP op;

  191.     UID *packages_refs;

  192.     int packages_count;

  193.     MXFMetadataSet **metadata_sets;

  194.     int metadata_sets_count;

  195.     AVFormatContext *fc;

  196.     struct AVAES *aesc;

  197.     uint8_t *local_tags;

  198.     int local_tags_count;

  199.     uint64_t footer_partition;

  200.     KLVPacket current_klv_data;

  201.     int current_klv_index;

  202.     int run_in;

  203.     MXFPartition *current_partition;

  204.     int parsing_backward;

  205.     int64_t last_forward_tell;

  206.     int last_forward_partition;

  207.     int current_edit_unit;

  208.     int nb_index_tables;

  209.     MXFIndexTable *index_tables;

  210. } MXFContext;

  211. 

  212. enum MXFWrappingScheme {

  213.     Frame,

  214.     Clip,

  215. };

  216. 

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

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

  219. 

  220. typedef struct {

  221.     const UID key;

  222.     MXFMetadataReadFunc *read;

  223.     int ctx_size;

  224.     enum MXFMetadataSetType type;

  225. } MXFMetadataReadTableEntry;

  226. 

  227. /* partial keys to match */

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

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

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

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

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

  233. /* complete keys to match */

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

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

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

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

  238. 

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

  240. 

  241. static int64_t klv_decode_ber_length(AVIOContext *pb)

  242. {

  243.     uint64_t size = avio_r8(pb);

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

  245.         int bytes_num = size & 0x7f;

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

  247.         if (bytes_num > 8)

  248.             return AVERROR_INVALIDDATA;

  249.         size = 0;

  250.         while (bytes_num--)

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

  252.     }

  253.     return size;

  254. }

  255. 

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

  257. {

  258.     int i, b;

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

  260.         b = avio_r8(pb);

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

  262.             i = 0;

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

  264.             i = -1;

  265.     }

  266.     return i == size;

  267. }

  268. 

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

  270. {

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

  272.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  278. }

  279. 

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

  281. {

  282.     int i;

  283. 

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

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

  286.         /* SMPTE 379M 7.3 */

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

  288.             return i;

  289.     }

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

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

  292. }

  293. 

  294. /* XXX: use AVBitStreamFilter */

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

  296. {

  297.     const uint8_t *buf_ptr, *end_ptr;

  298.     uint8_t *data_ptr;

  299.     int i;

  300. 

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

  302.         return AVERROR_INVALIDDATA;

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

  304.     if (length < 0)

  305.         return length;

  306.     data_ptr = pkt->data;

  307.     end_ptr = pkt->data + length;

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

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

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

  311.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  314.             else

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

  316.         }

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

  318.     }

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

  320.     return 0;

  321. }

  322. 

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

  324. {

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

  326.     MXFContext *mxf = s->priv_data;

  327.     AVIOContext *pb = s->pb;

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

  329.     int64_t size;

  330.     uint64_t orig_size;

  331.     uint64_t plaintext_size;

  332.     uint8_t ivec[16];

  333.     uint8_t tmpbuf[16];

  334.     int index;

  335. 

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

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

  338.         if (!mxf->aesc)

  339.             return AVERROR(ENOMEM);

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

  341.     }

  342.     // crypto context

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

  344.     // plaintext offset

  345.     klv_decode_ber_length(pb);

  346.     plaintext_size = avio_rb64(pb);

  347.     // source klv key

  348.     klv_decode_ber_length(pb);

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

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

  351.         return AVERROR_INVALIDDATA;

  352.     index = mxf_get_stream_index(s, klv);

  353.     if (index < 0)

  354.         return AVERROR_INVALIDDATA;

  355.     // source size

  356.     klv_decode_ber_length(pb);

  357.     orig_size = avio_rb64(pb);

  358.     if (orig_size < plaintext_size)

  359.         return AVERROR_INVALIDDATA;

  360.     // enc. code

  361.     size = klv_decode_ber_length(pb);

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

  363.         return AVERROR_INVALIDDATA;

  364.     avio_read(pb, ivec, 16);

  365.     avio_read(pb, tmpbuf, 16);

  366.     if (mxf->aesc)

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

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

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

  370.     size -= 32;

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

  372.     if (size < 0)

  373.         return size;

  374.     else if (size < plaintext_size)

  375.         return AVERROR_INVALIDDATA;

  376.     size -= plaintext_size;

  377.     if (mxf->aesc)

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

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

  380.     av_shrink_packet(pkt, orig_size);

  381.     pkt->stream_index = index;

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

  383.     return 0;

  384. }

  385. 

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

  387. {

  388.     MXFContext *mxf = arg;

  389.     int item_num = avio_rb32(pb);

  390.     int item_len = avio_rb32(pb);

  391. 

  392.     if (item_len != 18) {

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

  394.                               item_len);

  395.         return AVERROR_PATCHWELCOME;

  396.     }

  397.     if (item_num > UINT_MAX / item_len)

  398.         return AVERROR_INVALIDDATA;

  399.     mxf->local_tags_count = item_num;

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

  401.     if (!mxf->local_tags)

  402.         return AVERROR(ENOMEM);

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

  404.     return 0;

  405. }

  406. 

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

  408. {

  409.     MXFContext *mxf = arg;

  410.     MXFPartition *partition;

  411.     UID op;

  412.     uint64_t footer_partition;

  413.     uint32_t nb_essence_containers;

  414. 

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

  416.         return AVERROR(ENOMEM);

  417. 

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

  419.     if (!mxf->partitions)

  420.         return AVERROR(ENOMEM);

  421. 

  422.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  429.     } else {

  430.         mxf->last_forward_partition++;

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

  432.     }

  433. 

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

  435.     mxf->partitions_count++;

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

  437. 

  438.     switch(uid[13]) {

  439.     case 2:

  440.         partition->type = Header;

  441.         break;

  442.     case 3:

  443.         partition->type = BodyPartition;

  444.         break;

  445.     case 4:

  446.         partition->type = Footer;

  447.         break;

  448.     default:

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

  450.         return AVERROR_INVALIDDATA;

  451.     }

  452. 

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

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

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

  456.     avio_skip(pb, 4);

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

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

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

  460.     footer_partition = avio_rb64(pb);

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

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

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

  464.     avio_skip(pb, 8);

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

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

  467.     nb_essence_containers = avio_rb32(pb);

  468. 

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

  470.     if (footer_partition) {

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

  472.             av_log(mxf->fc, AV_LOG_ERROR, "inconsistent FooterPartition value: %" PRIi64 " != %" PRIi64 "\n",

  473.                    mxf->footer_partition, footer_partition);

  474.         } else {

  475.             mxf->footer_partition = footer_partition;

  476.         }

  477.     }

  478. 

  479.     av_dlog(mxf->fc, "PartitionPack: ThisPartition = 0x%" PRIx64 ", PreviousPartition = 0x%" PRIx64 ", "

  480.             "FooterPartition = 0x%" PRIx64 ", IndexSID = %i, BodySID = %i\n",

  481.             partition->this_partition,

  482.             partition->previous_partition, footer_partition,

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

  484. 

  485.     /* sanity check PreviousPartition if set */

  486.     if (partition->previous_partition &&

  487.         mxf->run_in + partition->previous_partition >= klv_offset) {

  488.         av_log(mxf->fc, AV_LOG_ERROR, "PreviousPartition points to this partition or forward\n");

  489.         return AVERROR_INVALIDDATA;

  490.     }

  491. 

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

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

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

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

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

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

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

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

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

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

  502.     else if (op[12] == 0x10) {

  503.         /* SMPTE 390m: "There shall be exactly one essence container"

  504.          * 2011_DCPTEST_24FPS.V.mxf violates this and is frame wrapped, hence why we assume OP1a */

  505.         if (nb_essence_containers != 1) {

  506.             /* only nag once */

  507.             if (!mxf->op)

  508.                 av_log(mxf->fc, AV_LOG_WARNING, "\"OPAtom\" with %u ECs - assuming OP1a\n", nb_essence_containers);

  509. 

  510.             mxf->op = OP1a;

  511.         } else

  512.             mxf->op = OPAtom;

  513.     } else {

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

  515.         mxf->op = OP1a;

  516.     }

  517. 

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

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

  520. 

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

  522.             partition->kag_size = 512;

  523.         else

  524.             partition->kag_size = 1;

  525. 

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

  527.     }

  528. 

  529.     return 0;

  530. }

  531. 

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

  533. {

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

  535.         return AVERROR(ENOMEM);

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

  537.     if (!mxf->metadata_sets)

  538.         return AVERROR(ENOMEM);

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

  540.     mxf->metadata_sets_count++;

  541.     return 0;

  542. }

  543. 

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

  545. {

  546.     MXFCryptoContext *cryptocontext = arg;

  547.     if (size != 16)

  548.         return AVERROR_INVALIDDATA;

  549.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  551.     return 0;

  552. }

  553. 

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

  555. {

  556.     MXFContext *mxf = arg;

  557.     switch (tag) {

  558.     case 0x1901:

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

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

  561.             return AVERROR_INVALIDDATA;

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

  563.         if (!mxf->packages_refs)

  564.             return AVERROR(ENOMEM);

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

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

  567.         break;

  568.     }

  569.     return 0;

  570. }

  571. 

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

  573. {

  574.     MXFStructuralComponent *source_clip = arg;

  575.     switch(tag) {

  576.     case 0x0202:

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

  578.         break;

  579.     case 0x1201:

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

  581.         break;

  582.     case 0x1101:

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

  584.         avio_skip(pb, 16);

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

  586.         break;

  587.     case 0x1102:

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

  589.         break;

  590.     }

  591.     return 0;

  592. }

  593. 

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

  595. {

  596.     MXFPackage *package = arg;

  597.     switch(tag) {

  598.     case 0x4403:

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

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

  601.             return AVERROR_INVALIDDATA;

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

  603.         if (!package->tracks_refs)

  604.             return AVERROR(ENOMEM);

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

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

  607.         break;

  608.     }

  609.     return 0;

  610. }

  611. 

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

  613. {

  614.     MXFTrack *track = arg;

  615.     switch(tag) {

  616.     case 0x4801:

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

  618.         break;

  619.     case 0x4804:

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

  621.         break;

  622.     case 0x4B01:

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

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

  625.         break;

  626.     case 0x4803:

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

  628.         break;

  629.     }

  630.     return 0;

  631. }

  632. 

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

  634. {

  635.     MXFSequence *sequence = arg;

  636.     switch(tag) {

  637.     case 0x0202:

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

  639.         break;

  640.     case 0x0201:

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

  642.         break;

  643.     case 0x1001:

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

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

  646.             return AVERROR_INVALIDDATA;

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

  648.         if (!sequence->structural_components_refs)

  649.             return AVERROR(ENOMEM);

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

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

  652.         break;

  653.     }

  654.     return 0;

  655. }

  656. 

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

  658. {

  659.     MXFPackage *package = arg;

  660.     switch(tag) {

  661.     case 0x4403:

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

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

  664.             return AVERROR_INVALIDDATA;

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

  666.         if (!package->tracks_refs)

  667.             return AVERROR(ENOMEM);

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

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

  670.         break;

  671.     case 0x4401:

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

  673.         avio_skip(pb, 16);

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

  675.         break;

  676.     case 0x4701:

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

  678.         break;

  679.     }

  680.     return 0;

  681. }

  682. 

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

  684. {

  685.     int i, length;

  686. 

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

  688.     length = avio_rb32(pb);

  689. 

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

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

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

  693.         return AVERROR(ENOMEM);

  694. 

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

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

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

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

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

  700.         avio_skip(pb, length - 11);

  701.     }

  702.     return 0;

  703. }

  704. 

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

  706. {

  707.     MXFIndexTableSegment *segment = arg;

  708.     switch(tag) {

  709.     case 0x3F05:

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

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

  712.         break;

  713.     case 0x3F06:

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

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

  716.         break;

  717.     case 0x3F07:

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

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

  720.         break;

  721.     case 0x3F0A:

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

  723.         return mxf_read_index_entry_array(pb, segment);

  724.     case 0x3F0B:

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

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

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

  728.                 segment->index_edit_rate.den);

  729.         break;

  730.     case 0x3F0C:

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

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

  733.         break;

  734.     case 0x3F0D:

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

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

  737.         break;

  738.     }

  739.     return 0;

  740. }

  741. 

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

  743. {

  744.     int code, value, ofs = 0;

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

  746. 

  747.     do {

  748.         code = avio_r8(pb);

  749.         value = avio_r8(pb);

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

  751. 

  752.         if (ofs < 16) {

  753.             layout[ofs++] = code;

  754.             layout[ofs++] = value;

  755.         }

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

  757. 

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

  759. }

  760. 

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

  762. {

  763.     MXFDescriptor *descriptor = arg;

  764.     switch(tag) {

  765.     case 0x3F01:

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

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

  768.             return AVERROR_INVALIDDATA;

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

  770.         if (!descriptor->sub_descriptors_refs)

  771.             return AVERROR(ENOMEM);

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

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

  774.         break;

  775.     case 0x3004:

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

  777.         break;

  778.     case 0x3006:

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

  780.         break;

  781.     case 0x3201: /* PictureEssenceCoding */

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

  783.         break;

  784.     case 0x3203:

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

  786.         break;

  787.     case 0x3202:

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

  789.         break;

  790.     case 0x320E:

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

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

  793.         break;

  794.     case 0x3D03:

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

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

  797.         break;

  798.     case 0x3D06: /* SoundEssenceCompression */

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

  800.         break;

  801.     case 0x3D07:

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

  803.         break;

  804.     case 0x3D01:

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

  806.         break;

  807.     case 0x3401:

  808.         mxf_read_pixel_layout(pb, descriptor);

  809.         break;

  810.     default:

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

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

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

  814.             if (!descriptor->extradata)

  815.                 return AVERROR(ENOMEM);

  816.             descriptor->extradata_size = size;

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

  818.         }

  819.         break;

  820.     }

  821.     return 0;

  822. }

  823. 

  824. /*

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

  826.  * Returns: boolean

  827.  */

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

  829. {

  830.     int i;

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

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

  833.             return 0;

  834.     }

  835.     return 1;

  836. }

  837. 

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

  839. {

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

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

  842.             break;

  843.         uls++;

  844.     }

  845.     return uls;

  846. }

  847. 

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

  849. {

  850.     int i;

  851. 

  852.     if (!strong_ref)

  853.         return NULL;

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

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

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

  857.             return mxf->metadata_sets[i];

  858.         }

  859.     }

  860.     return NULL;

  861. }

  862. 

  863. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  864.     // video essence container uls

  865.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  866.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  867.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  868. };

  869. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  870.     // sound essence container uls

  871.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  872.     { { 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 */

  873.     { { 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 */

  874.     { { 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 */

  875.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  876. };

  877. 

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

  879. {

  880.     int i, j, nb_segments = 0;

  881.     MXFIndexTableSegment **unsorted_segments;

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

  883. 

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

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

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

  887.             nb_segments++;

  888. 

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

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

  891.         av_free(unsorted_segments);

  892.         return AVERROR(ENOMEM);

  893.     }

  894. 

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

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

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

  898. 

  899.     *nb_sorted_segments = 0;

  900. 

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

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

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

  904. 

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

  906.             MXFIndexTableSegment *s = unsorted_segments[j];

  907. 

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

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

  910.              */

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

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

  913.                 best             = j;

  914.                 best_body_sid    = s->body_sid;

  915.                 best_index_sid   = s->index_sid;

  916.                 best_index_start = s->index_start_position;

  917.             }

  918.         }

  919. 

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

  921.         if (best == -1)

  922.             break;

  923. 

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

  925.         last_body_sid    = best_body_sid;

  926.         last_index_sid   = best_index_sid;

  927.         last_index_start = best_index_start;

  928.     }

  929. 

  930.     av_free(unsorted_segments);

  931. 

  932.     return 0;

  933. }

  934. 

  935. /**

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

  937.  */

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

  939. {

  940.     int x;

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

  942. 

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

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

  945. 

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

  947.             continue;

  948. 

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

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

  951.             return 0;

  952.         }

  953. 

  954.         offset -= p->essence_length;

  955.     }

  956. 

  957.     av_log(mxf->fc, AV_LOG_ERROR, "failed to find absolute offset of %" PRIx64" in BodySID %i - partial file?\n",

  958.            offset_in, body_sid);

  959. 

  960.     return AVERROR_INVALIDDATA;

  961. }

  962. 

  963. /**

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

  965.  */

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

  967. {

  968.     int x;

  969.     int64_t ret = 0;

  970. 

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

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

  973. 

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

  975.             continue;

  976. 

  977.         if (!p->essence_length)

  978.             return 0;

  979. 

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

  981.     }

  982. 

  983.     return ret;

  984. }

  985. 

  986. /* EditUnit -> absolute offset */

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

  988. {

  989.     int i;

  990.     int offset_temp = 0;

  991. 

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

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

  994. 

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

  996. 

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

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

  999. 

  1000.             if (s->edit_unit_byte_count)

  1001.                 offset_temp += s->edit_unit_byte_count * index;

  1002.             else if (s->nb_index_entries) {

  1003.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1004.                     index *= 2;     /* Avid index */

  1005. 

  1006.                 if (index < 0 || index > s->nb_index_entries) {

  1007.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1008.                            index_table->index_sid, s->index_start_position);

  1009.                     return AVERROR_INVALIDDATA;

  1010.                 }

  1011. 

  1012.                 offset_temp = s->stream_offset_entries[index];

  1013.             } else {

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

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

  1016.                 return AVERROR_INVALIDDATA;

  1017.             }

  1018. 

  1019.             if (edit_unit_out)

  1020.                 *edit_unit_out = edit_unit;

  1021. 

  1022.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1023.         } else {

  1024.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1025.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1026.         }

  1027.     }

  1028. 

  1029.     if (nag)

  1030.         av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);

  1031. 

  1032.     return AVERROR_INVALIDDATA;

  1033. }

  1034. 

  1035. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1036. {

  1037.     int i, j, x;

  1038.     int8_t max_temporal_offset = -128;

  1039. 

  1040.     /* first compute how many entries we have */

  1041.     for (i = 0; i < index_table->nb_segments; i++) {

  1042.         MXFIndexTableSegment *s = index_table->segments[i];

  1043. 

  1044.         if (!s->nb_index_entries) {

  1045.             index_table->nb_ptses = 0;

  1046.             return 0;                               /* no TemporalOffsets */

  1047.         }

  1048. 

  1049.         index_table->nb_ptses += s->index_duration;

  1050.     }

  1051. 

  1052.     /* paranoid check */

  1053.     if (index_table->nb_ptses <= 0)

  1054.         return 0;

  1055. 

  1056.     if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||

  1057.         !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {

  1058.         av_freep(&index_table->ptses);

  1059.         return AVERROR(ENOMEM);

  1060.     }

  1061. 

  1062.     /* we may have a few bad TemporalOffsets

  1063.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1064.     for (x = 0; x < index_table->nb_ptses; x++)

  1065.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1066. 

  1067.     /**

  1068.      * We have this:

  1069.      *

  1070.      * x  TemporalOffset

  1071.      * 0:  0

  1072.      * 1:  1

  1073.      * 2:  1

  1074.      * 3: -2

  1075.      * 4:  1

  1076.      * 5:  1

  1077.      * 6: -2

  1078.      *

  1079.      * We want to transform it into this:

  1080.      *

  1081.      * x  DTS PTS

  1082.      * 0: -1   0

  1083.      * 1:  0   3

  1084.      * 2:  1   1

  1085.      * 3:  2   2

  1086.      * 4:  3   6

  1087.      * 5:  4   4

  1088.      * 6:  5   5

  1089.      *

  1090.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1091.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1092.      * The latter makes DTS <= PTS.

  1093.      */

  1094.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1095.         MXFIndexTableSegment *s = index_table->segments[i];

  1096.         int index_delta = 1;

  1097.         int n = s->nb_index_entries;

  1098. 

  1099.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1100.             index_delta = 2;    /* Avid index */

  1101. 

  1102.             /* ignore the last entry - it's the size of the essence container */

  1103.             n--;

  1104.         }

  1105. 

  1106.         for (j = 0; j < n; j += index_delta, x++) {

  1107.             int offset = s->temporal_offset_entries[j] / index_delta;

  1108.             int index  = x + offset;

  1109. 

  1110.             if (x >= index_table->nb_ptses) {

  1111.                 av_log(mxf->fc, AV_LOG_ERROR, "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1112.                        s->nb_index_entries, s->index_duration);

  1113.                 break;

  1114.             }

  1115. 

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

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

  1118. 

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

  1120.                 av_log(mxf->fc, AV_LOG_ERROR,

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

  1122.                        x, offset, index);

  1123.                 continue;

  1124.             }

  1125. 

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

  1127.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1128.         }

  1129.     }

  1130. 

  1131.     index_table->first_dts = -max_temporal_offset;

  1132. 

  1133.     return 0;

  1134. }

  1135. 

  1136. /**

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

  1138.  * Also computes PTSes if possible.

  1139.  */

  1140. static int mxf_compute_index_tables(MXFContext *mxf)

  1141. {

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

  1143.     MXFIndexTableSegment **sorted_segments = NULL;

  1144. 

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

  1146.         nb_sorted_segments <= 0) {

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

  1148.         return 0;

  1149.     }

  1150. 

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

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

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

  1154.             mxf->nb_index_tables++;

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

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

  1157.             ret = AVERROR_INVALIDDATA;

  1158.             goto finish_decoding_index;

  1159.         }

  1160.     }

  1161. 

  1162.     if (!(mxf->index_tables = av_calloc(mxf->nb_index_tables, sizeof(MXFIndexTable)))) {

  1163.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1164.         ret = AVERROR(ENOMEM);

  1165.         goto finish_decoding_index;

  1166.     }

  1167. 

  1168.     /* distribute sorted segments to index tables */

  1169.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1170.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1171.             /* next IndexSID */

  1172.             j++;

  1173.         }

  1174. 

  1175.         mxf->index_tables[j].nb_segments++;

  1176.     }

  1177. 

  1178.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1179.         MXFIndexTable *t = &mxf->index_tables[j];

  1180. 

  1181.         if (!(t->segments = av_calloc(t->nb_segments, sizeof(MXFIndexTableSegment*)))) {

  1182.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment pointer array\n");

  1183.             ret = AVERROR(ENOMEM);

  1184.             goto finish_decoding_index;

  1185.         }

  1186. 

  1187.         if (sorted_segments[i]->index_start_position)

  1188.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1189.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1190. 

  1191.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1192.         t->index_sid = sorted_segments[i]->index_sid;

  1193.         t->body_sid = sorted_segments[i]->body_sid;

  1194. 

  1195.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1196.             goto finish_decoding_index;

  1197. 

  1198.         /* fix zero IndexDurations */

  1199.         for (k = 0; k < t->nb_segments; k++) {

  1200.             if (t->segments[k]->index_duration)

  1201.                 continue;

  1202. 

  1203.             if (t->nb_segments > 1)

  1204.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1205.                        t->index_sid, k);

  1206. 

  1207.             if (mxf->fc->nb_streams <= 0) {

  1208.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1209.                 break;

  1210.             }

  1211. 

  1212.             /* assume the first stream's duration is reasonable

  1213.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1214.              */

  1215.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1216.             break;

  1217.         }

  1218.     }

  1219. 

  1220.     ret = 0;

  1221. finish_decoding_index:

  1222.     av_free(sorted_segments);

  1223.     return ret;

  1224. }

  1225. 

  1226. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1227. {

  1228.     MXFPackage *material_package = NULL;

  1229.     MXFPackage *temp_package = NULL;

  1230.     int i, j, k, ret;

  1231. 

  1232.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1233.     /* TODO: handle multiple material packages (OP3x) */

  1234.     for (i = 0; i < mxf->packages_count; i++) {

  1235.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1236.         if (material_package) break;

  1237.     }

  1238.     if (!material_package) {

  1239.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1240.         return AVERROR_INVALIDDATA;

  1241.     }

  1242. 

  1243.     for (i = 0; i < material_package->tracks_count; i++) {

  1244.         MXFPackage *source_package = NULL;

  1245.         MXFTrack *material_track = NULL;

  1246.         MXFTrack *source_track = NULL;

  1247.         MXFTrack *temp_track = NULL;

  1248.         MXFDescriptor *descriptor = NULL;

  1249.         MXFStructuralComponent *component = NULL;

  1250.         UID *essence_container_ul = NULL;

  1251.         const MXFCodecUL *codec_ul = NULL;

  1252.         const MXFCodecUL *container_ul = NULL;

  1253.         AVStream *st;

  1254. 

  1255.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1256.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1257.             continue;

  1258.         }

  1259. 

  1260.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1261.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1262.             continue;

  1263.         }

  1264. 

  1265.         /* TODO: handle multiple source clips */

  1266.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1267.             /* TODO: handle timecode component */

  1268.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1269.             if (!component)

  1270.                 continue;

  1271. 

  1272.             for (k = 0; k < mxf->packages_count; k++) {

  1273.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1274.                 if (!temp_package)

  1275.                     continue;

  1276.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1277.                     source_package = temp_package;

  1278.                     break;

  1279.                 }

  1280.             }

  1281.             if (!source_package) {

  1282.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1283.                 break;

  1284.             }

  1285.             for (k = 0; k < source_package->tracks_count; k++) {

  1286.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1287.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1288.                     ret = AVERROR_INVALIDDATA;

  1289.                     goto fail_and_free;

  1290.                 }

  1291.                 if (temp_track->track_id == component->source_track_id) {

  1292.                     source_track = temp_track;

  1293.                     break;

  1294.                 }

  1295.             }

  1296.             if (!source_track) {

  1297.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1298.                 break;

  1299.             }

  1300.         }

  1301.         if (!source_track || !component)

  1302.             continue;

  1303. 

  1304.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1305.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1306.             ret = -1;

  1307.             goto fail_and_free;

  1308.         }

  1309. 

  1310.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1311.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1312.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1313.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1314.             continue;

  1315.         }

  1316. 

  1317.         st = avformat_new_stream(mxf->fc, NULL);

  1318.         if (!st) {

  1319.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1320.             ret = AVERROR(ENOMEM);

  1321.             goto fail_and_free;

  1322.         }

  1323.         st->id = source_track->track_id;

  1324.         st->priv_data = source_track;

  1325.         st->duration = component->duration;

  1326.         if (st->duration == -1)

  1327.             st->duration = AV_NOPTS_VALUE;

  1328.         st->start_time = component->start_position;

  1329.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1330. 

  1331.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1332.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1333.         st->codec->codec_type = codec_ul->id;

  1334. 

  1335.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1336.         if (source_package->descriptor) {

  1337.             if (source_package->descriptor->type == MultipleDescriptor) {

  1338.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1339.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1340. 

  1341.                     if (!sub_descriptor) {

  1342.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1343.                         continue;

  1344.                     }

  1345.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1346.                         descriptor = sub_descriptor;

  1347.                         break;

  1348.                     }

  1349.                 }

  1350.             } else if (source_package->descriptor->type == Descriptor)

  1351.                 descriptor = source_package->descriptor;

  1352.         }

  1353.         if (!descriptor) {

  1354.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1355.             continue;

  1356.         }

  1357.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1358.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1359.         essence_container_ul = &descriptor->essence_container_ul;

  1360.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1361.          * is not allowed according to s429-6, try to find correct information anyway */

  1362.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1363.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1364.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1365.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1366.                 if (metadata->type == CryptoContext) {

  1367.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1368.                     break;

  1369.                 }

  1370.             }

  1371.         }

  1372. 

  1373.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1374.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1375.         st->codec->codec_id = codec_ul->id;

  1376.         if (descriptor->extradata) {

  1377.             st->codec->extradata = descriptor->extradata;

  1378.             st->codec->extradata_size = descriptor->extradata_size;

  1379.         }

  1380.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1381.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1382.             if (st->codec->codec_id == CODEC_ID_NONE)

  1383.                 st->codec->codec_id = container_ul->id;

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

  1385.             st->codec->height = descriptor->height;

  1386.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1387.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1388.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1389.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1390.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1391.             if (st->codec->codec_id == CODEC_ID_NONE)

  1392.                 st->codec->codec_id = container_ul->id;

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

  1394.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1395.             if (descriptor->sample_rate.den > 0)

  1396.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1397.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1398.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1399.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1400.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1401.                 else if (descriptor->bits_per_sample == 32)

  1402.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1403.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

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

  1405.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

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

  1407.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1408.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1409.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1410.             }

  1411.         }

  1412.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1413.             /* TODO: decode timestamps */

  1414.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1415.         }

  1416.     }

  1417. 

  1418.     ret = 0;

  1419. fail_and_free:

  1420.     return ret;

  1421. }

  1422. 

  1423. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1424.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1425.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1426.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1427.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1428.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1429.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1430.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1431.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1432.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

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

  1434.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1435.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1436.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1437.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1438.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1439.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1440.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1441.     { { 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 */

  1442.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1443.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1444.     { { 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 */

  1445.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1446.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1447.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1448.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1449.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1450.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1451.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1452. };

  1453. 

  1454. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1455. {

  1456.     AVIOContext *pb = mxf->fc->pb;

  1457.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1458.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1459. 

  1460.     if (!ctx)

  1461.         return AVERROR(ENOMEM);

  1462.     while (avio_tell(pb) + 4 < klv_end && !url_feof(pb)) {

  1463.         int ret;

  1464.         int tag = avio_rb16(pb);

  1465.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1466.         uint64_t next = avio_tell(pb) + size;

  1467.         UID uid = {0};

  1468. 

  1469.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1470.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1471.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1472.             continue;

  1473.         }

  1474.         if (tag > 0x7FFF) { /* dynamic tag */

  1475.             int i;

  1476.             for (i = 0; i < mxf->local_tags_count; i++) {

  1477.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1478.                 if (local_tag == tag) {

  1479.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1480.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1481.                     PRINT_KEY(mxf->fc, "uid", uid);

  1482.                 }

  1483.             }

  1484.         }

  1485.         if (ctx_size && tag == 0x3C0A)

  1486.             avio_read(pb, ctx->uid, 16);

  1487.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1488.             return ret;

  1489. 

  1490.         /* accept the 64k local set limit being exceeded (Avid)

  1491.          * don't accept it extending past the end of the KLV though (zzuf5.mxf) */

  1492.         if (avio_tell(pb) > klv_end) {

  1493.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1494.                    tag, klv->offset);

  1495.             return AVERROR_INVALIDDATA;

  1496.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1497.         avio_seek(pb, next, SEEK_SET);

  1498.     }

  1499.     if (ctx_size) ctx->type = type;

  1500.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1501. }

  1502. 

  1503. /**

  1504.  * Seeks to the previous partition, if possible

  1505.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1506.  */

  1507. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1508. {

  1509.     AVIOContext *pb = mxf->fc->pb;

  1510. 

  1511.     if (!mxf->current_partition ||

  1512.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1513.         return 0;   /* we've parsed all partitions */

  1514. 

  1515.     /* seek to previous partition */

  1516.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1517.     mxf->current_partition = NULL;

  1518. 

  1519.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1520. 

  1521.     return 1;

  1522. }

  1523. 

  1524. /**

  1525.  * Called when essence is encountered

  1526.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1527.  */

  1528. static int mxf_parse_handle_essence(MXFContext *mxf)

  1529. {

  1530.     AVIOContext *pb = mxf->fc->pb;

  1531.     int64_t ret;

  1532. 

  1533.     if (mxf->parsing_backward) {

  1534.         return mxf_seek_to_previous_partition(mxf);

  1535.     } else {

  1536.         if (!mxf->footer_partition) {

  1537.             av_dlog(mxf->fc, "no footer\n");

  1538.             return 0;

  1539.         }

  1540. 

  1541.         av_dlog(mxf->fc, "seeking to footer\n");

  1542. 

  1543.         /* remember where we were so we don't end up seeking further back than this */

  1544.         mxf->last_forward_tell = avio_tell(pb);

  1545. 

  1546.         if (!pb->seekable) {

  1547.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1548.             return -1;

  1549.         }

  1550. 

  1551.         /* seek to footer partition and parse backward */

  1552.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1553.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1554.                    mxf->run_in + mxf->footer_partition, ret);

  1555.             return ret;

  1556.         }

  1557. 

  1558.         mxf->current_partition = NULL;

  1559.         mxf->parsing_backward = 1;

  1560.     }

  1561. 

  1562.     return 1;

  1563. }

  1564. 

  1565. /**

  1566.  * Called when the next partition or EOF is encountered

  1567.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1568.  */

  1569. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1570. {

  1571.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1572. }

  1573. 

  1574. /**

  1575.  * Figures out the proper offset and length of the essence container in each partition

  1576.  */

  1577. static void mxf_compute_essence_containers(MXFContext *mxf)

  1578. {

  1579.     int x;

  1580. 

  1581.     /* everything is already correct */

  1582.     if (mxf->op == OPAtom)

  1583.         return;

  1584. 

  1585.     for (x = 0; x < mxf->partitions_count; x++) {

  1586.         MXFPartition *p = &mxf->partitions[x];

  1587. 

  1588.         if (!p->body_sid)

  1589.             continue;       /* BodySID == 0 -> no essence */

  1590. 

  1591.         if (x >= mxf->partitions_count - 1)

  1592.             break;          /* last partition - can't compute length (and we don't need to) */

  1593. 

  1594.         /* essence container spans to the next partition */

  1595.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1596. 

  1597.         if (p->essence_length < 0) {

  1598.             /* next ThisPartition < essence_offset */

  1599.             p->essence_length = 0;

  1600.             av_log(mxf->fc, AV_LOG_ERROR, "partition %i: bad ThisPartition = %" PRIx64 "\n",

  1601.                    x+1, mxf->partitions[x+1].this_partition);

  1602.         }

  1603.     }

  1604. }

  1605. 

  1606. static int64_t round_to_kag(int64_t position, int kag_size)

  1607. {

  1608.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1609.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1610.     int64_t ret = (position / kag_size) * kag_size;

  1611.     return ret == position ? ret : ret + kag_size;

  1612. }

  1613. 

  1614. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1615. {

  1616.     MXFContext *mxf = s->priv_data;

  1617.     KLVPacket klv;

  1618.     int64_t essence_offset = 0;

  1619.     int ret;

  1620. 

  1621.     mxf->last_forward_tell = INT64_MAX;

  1622. 

  1623.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1624.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1625.         return AVERROR_INVALIDDATA;

  1626.     }

  1627.     avio_seek(s->pb, -14, SEEK_CUR);

  1628.     mxf->fc = s;

  1629.     mxf->run_in = avio_tell(s->pb);

  1630. 

  1631.     while (!url_feof(s->pb)) {

  1632.         const MXFMetadataReadTableEntry *metadata;

  1633. 

  1634.         if (klv_read_packet(&klv, s->pb) < 0) {

  1635.             /* EOF - seek to previous partition or stop */

  1636.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1637.                 break;

  1638.             else

  1639.                 continue;

  1640.         }

  1641. 

  1642.         PRINT_KEY(s, "read header", klv.key);

  1643.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1644.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1645.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1646.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1647.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1648. 

  1649.             if (!mxf->current_partition) {

  1650.                 av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");

  1651.                 return AVERROR_INVALIDDATA;

  1652.             }

  1653. 

  1654.             if (!mxf->current_partition->essence_offset) {

  1655.                 /* for OP1a we compute essence_offset

  1656.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1657.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1658.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1659.                  */

  1660.                 int64_t op1a_essence_offset =

  1661.                     round_to_kag(mxf->current_partition->this_partition +

  1662.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1663.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1664.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1665. 

  1666.                 if (mxf->op == OPAtom) {

  1667.                     /* point essence_offset to the actual data

  1668.                     * OPAtom has all the essence in one big KLV

  1669.                     */

  1670.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1671.                     mxf->current_partition->essence_length = klv.length;

  1672.                 } else {

  1673.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1674.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1675.                 }

  1676.             }

  1677. 

  1678.             if (!essence_offset)

  1679.                 essence_offset = klv.offset;

  1680. 

  1681.             /* seek to footer, previous partition or stop */

  1682.             if (mxf_parse_handle_essence(mxf) <= 0)

  1683.                 break;

  1684.             continue;

  1685.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1686.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1687.             /* next partition pack - keep going, seek to previous partition or stop */

  1688.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1689.                 break;

  1690.         }

  1691. 

  1692.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1693.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1694.                 int res;

  1695.                 if (klv.key[5] == 0x53) {

  1696.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1697.                 } else {

  1698.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1699.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1700. 

  1701.                     /* only seek forward, else this can loop for a long time */

  1702.                     if (avio_tell(s->pb) > next) {

  1703.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1704.                                klv.offset);

  1705.                         return AVERROR_INVALIDDATA;

  1706.                     }

  1707. 

  1708.                     avio_seek(s->pb, next, SEEK_SET);

  1709.                 }

  1710.                 if (res < 0) {

  1711.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1712.                     return res;

  1713.                 }

  1714.                 break;

  1715.             }

  1716.         }

  1717.         if (!metadata->read)

  1718.             avio_skip(s->pb, klv.length);

  1719.     }

  1720.     /* FIXME avoid seek */

  1721.     if (!essence_offset)  {

  1722.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1723.         return AVERROR_INVALIDDATA;

  1724.     }

  1725.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1726. 

  1727.     mxf_compute_essence_containers(mxf);

  1728. 

  1729.     /* we need to do this before computing the index tables

  1730.      * to be able to fill in zero IndexDurations with st->duration */

  1731.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1732.         return ret;

  1733. 

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

  1735.         return ret;

  1736. 

  1737.     if (mxf->nb_index_tables > 1) {

  1738.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1739.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1740.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1741.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1742.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1743.         return AVERROR_INVALIDDATA;

  1744.     }

  1745. 

  1746.     return 0;

  1747. }

  1748. 

  1749. /**

  1750.  * Computes DTS and PTS for the given video packet based on its offset.

  1751.  */

  1752. static void mxf_packet_timestamps(MXFContext *mxf, AVPacket *pkt)

  1753. {

  1754.     int64_t last_ofs = -1, next_ofs;

  1755.     MXFIndexTable *t = &mxf->index_tables[0];

  1756. 

  1757.     /* this is called from the OP1a demuxing logic, which means there may be no index tables */

  1758.     if (mxf->nb_index_tables <= 0)

  1759.         return;

  1760. 

  1761.     /* find mxf->current_edit_unit so that the next edit unit starts ahead of pkt->pos */

  1762.     while (mxf->current_edit_unit >= 0) {

  1763.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_ofs, 0) < 0)

  1764.             break;

  1765. 

  1766.         if (next_ofs <= last_ofs) {

  1767.             /* large next_ofs didn't change or current_edit_unit wrapped around

  1768.              * this fixes the infinite loop on zzuf3.mxf */

  1769.             av_log(mxf->fc, AV_LOG_ERROR, "next_ofs didn't change. not deriving packet timestamps\n");

  1770.             return;

  1771.         }

  1772. 

  1773.         if (next_ofs > pkt->pos)

  1774.             break;

  1775. 

  1776.         last_ofs = next_ofs;

  1777.         mxf->current_edit_unit++;

  1778.     }

  1779. 

  1780.     if (mxf->current_edit_unit < 0 || mxf->current_edit_unit >= t->nb_ptses)

  1781.         return;

  1782. 

  1783.     pkt->dts = mxf->current_edit_unit + t->first_dts;

  1784.     pkt->pts = t->ptses[mxf->current_edit_unit];

  1785. }

  1786. 

  1787. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1788. {

  1789.     KLVPacket klv;

  1790. 

  1791.     while (!url_feof(s->pb)) {

  1792.         int ret;

  1793.         if (klv_read_packet(&klv, s->pb) < 0)

  1794.             return -1;

  1795.         PRINT_KEY(s, "read packet", klv.key);

  1796.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1797.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1798.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  1799.             if (ret < 0) {

  1800.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1801.                 return AVERROR_INVALIDDATA;

  1802.             }

  1803.             return 0;

  1804.         }

  1805.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1806.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  1807.             int index = mxf_get_stream_index(s, &klv);

  1808.             if (index < 0) {

  1809.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  1810.                 goto skip;

  1811.             }

  1812.             if (s->streams[index]->discard == AVDISCARD_ALL)

  1813.                 goto skip;

  1814.             /* check for 8 channels AES3 element */

  1815.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  1816.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  1817.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  1818.                     return AVERROR_INVALIDDATA;

  1819.                 }

  1820.             } else {

  1821.                 ret = av_get_packet(s->pb, pkt, klv.length);

  1822.                 if (ret < 0)

  1823.                     return ret;

  1824.             }

  1825.             pkt->stream_index = index;

  1826.             pkt->pos = klv.offset;

  1827. 

  1828.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)

  1829.                 mxf_packet_timestamps(s->priv_data, pkt);   /* offset -> EditUnit -> DTS/PTS */

  1830. 

  1831.             return 0;

  1832.         } else

  1833.         skip:

  1834.             avio_skip(s->pb, klv.length);

  1835.     }

  1836.     return AVERROR_EOF;

  1837. }

  1838. 

  1839. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1840. {

  1841.     MXFContext *mxf = s->priv_data;

  1842.     int ret, size;

  1843.     int64_t ret64, pos, next_pos;

  1844.     AVStream *st;

  1845.     MXFIndexTable *t;

  1846. 

  1847.     if (mxf->op != OPAtom)

  1848.         return mxf_read_packet_old(s, pkt);

  1849. 

  1850.     /* OPAtom - clip wrapped demuxing */

  1851.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  1852.     st = s->streams[0];

  1853.     t = &mxf->index_tables[0];

  1854. 

  1855.     if (mxf->current_edit_unit >= st->duration)

  1856.         return AVERROR_EOF;

  1857. 

  1858.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  1859.         return ret;

  1860. 

  1861.     /* compute size by finding the next edit unit or the end of the essence container

  1862.      * not pretty, but it works */

  1863.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_pos, 0)) < 0 &&

  1864.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  1865.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  1866.         return AVERROR_INVALIDDATA;

  1867.     }

  1868. 

  1869.     if ((size = next_pos - pos) <= 0) {

  1870.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  1871.         return AVERROR_INVALIDDATA;

  1872.     }

  1873. 

  1874.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  1875.         return ret64;

  1876. 

  1877.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  1878.             return ret < 0 ? ret : AVERROR_EOF;

  1879. 

  1880.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  1881.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  1882.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  1883.         pkt->pts = t->ptses[mxf->current_edit_unit];

  1884.     }

  1885. 

  1886.     pkt->stream_index = 0;

  1887.     mxf->current_edit_unit++;

  1888. 

  1889.     return 0;

  1890. }

  1891. 

  1892. static int mxf_read_close(AVFormatContext *s)

  1893. {

  1894.     MXFContext *mxf = s->priv_data;

  1895.     MXFIndexTableSegment *seg;

  1896.     int i;

  1897. 

  1898.     av_freep(&mxf->packages_refs);

  1899. 

  1900.     for (i = 0; i < s->nb_streams; i++)

  1901.         s->streams[i]->priv_data = NULL;

  1902. 

  1903.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1904.         switch (mxf->metadata_sets[i]->type) {

  1905.         case MultipleDescriptor:

  1906.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1907.             break;

  1908.         case Sequence:

  1909.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1910.             break;

  1911.         case SourcePackage:

  1912.         case MaterialPackage:

  1913.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1914.             break;

  1915.         case IndexTableSegment:

  1916.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1917.             av_freep(&seg->temporal_offset_entries);

  1918.             av_freep(&seg->flag_entries);

  1919.             av_freep(&seg->stream_offset_entries);

  1920.             break;

  1921.         default:

  1922.             break;

  1923.         }

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

  1925.     }

  1926.     av_freep(&mxf->partitions);

  1927.     av_freep(&mxf->metadata_sets);

  1928.     av_freep(&mxf->aesc);

  1929.     av_freep(&mxf->local_tags);

  1930. 

  1931.     for (i = 0; i < mxf->nb_index_tables; i++) {

  1932.         av_freep(&mxf->index_tables[i].segments);

  1933.         av_freep(&mxf->index_tables[i].ptses);

  1934.         av_freep(&mxf->index_tables[i].fake_index);

  1935.     }

  1936.     av_freep(&mxf->index_tables);

  1937. 

  1938.     return 0;

  1939. }

  1940. 

  1941. static int mxf_probe(AVProbeData *p) {

  1942.     uint8_t *bufp = p->buf;

  1943.     uint8_t *end = p->buf + p->buf_size;

  1944. 

  1945.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1946.         return 0;

  1947. 

  1948.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1949.     end -= sizeof(mxf_header_partition_pack_key);

  1950.     for (; bufp < end; bufp++) {

  1951.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1952.             return AVPROBE_SCORE_MAX;

  1953.     }

  1954.     return 0;

  1955. }

  1956. 

  1957. /* rudimentary byte seek */

  1958. /* XXX: use MXF Index */

  1959. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1960. {

  1961.     AVStream *st = s->streams[stream_index];

  1962.     int64_t seconds;

  1963.     MXFContext* mxf = s->priv_data;

  1964.     int64_t seekpos;

  1965.     int ret;

  1966.     MXFIndexTable *t;

  1967. 

  1968.     if (mxf->index_tables <= 0) {

  1969.     if (!s->bit_rate)

  1970.         return AVERROR_INVALIDDATA;

  1971.     if (sample_time < 0)

  1972.         sample_time = 0;

  1973.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1974.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1975.         return -1;

  1976.     ff_update_cur_dts(s, st, sample_time);

  1977.     } else {

  1978.         t = &mxf->index_tables[0];

  1979. 

  1980.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  1981.          * this also means we allow seeking before the start */

  1982.         sample_time = FFMAX(sample_time, 0);

  1983. 

  1984.         if (t->fake_index) {

  1985.             /* behave as if we have a proper index */

  1986.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  1987.                 return sample_time;

  1988.         } else {

  1989.             /* no IndexEntryArray (one or more CBR segments)

  1990.              * make sure we don't seek past the end */

  1991.             sample_time = FFMIN(sample_time, st->duration - 1);

  1992.         }

  1993. 

  1994.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  1995.             return ret;

  1996. 

  1997.         av_update_cur_dts(s, st, sample_time);

  1998.         mxf->current_edit_unit = sample_time;

  1999.         avio_seek(s->pb, seekpos, SEEK_SET);

  2000.     }

  2001.     return 0;

  2002. }

  2003. 

  2004. AVInputFormat ff_mxf_demuxer = {

  2005.     .name           = "mxf",

  2006.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  2007.     .priv_data_size = sizeof(MXFContext),

  2008.     .read_probe     = mxf_probe,

  2009.     .read_header    = mxf_read_header,

  2010.     .read_packet    = mxf_read_packet,

  2011.     .read_close     = mxf_read_close,

  2012.     .read_seek      = mxf_read_seek,

  2013. };