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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.     int edit_units_per_packet;      ///< how many edit units to read at a time (PCM, OPAtom)

  211. } MXFContext;

  212. 

  213. enum MXFWrappingScheme {

  214.     Frame,

  215.     Clip,

  216. };

  217. 

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

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

  220. 

  221. typedef struct {

  222.     const UID key;

  223.     MXFMetadataReadFunc *read;

  224.     int ctx_size;

  225.     enum MXFMetadataSetType type;

  226. } MXFMetadataReadTableEntry;

  227. 

  228. /* partial keys to match */

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

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

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

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

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

  234. /* complete keys to match */

  235. 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 };

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

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

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

  239. 

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

  241. 

  242. static int64_t klv_decode_ber_length(AVIOContext *pb)

  243. {

  244.     uint64_t size = avio_r8(pb);

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

  246.         int bytes_num = size & 0x7f;

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

  248.         if (bytes_num > 8)

  249.             return AVERROR_INVALIDDATA;

  250.         size = 0;

  251.         while (bytes_num--)

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

  253.     }

  254.     return size;

  255. }

  256. 

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

  258. {

  259.     int i, b;

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

  261.         b = avio_r8(pb);

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

  263.             i = 0;

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

  265.             i = -1;

  266.     }

  267.     return i == size;

  268. }

  269. 

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

  271. {

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

  273.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  279. }

  280. 

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

  282. {

  283.     int i;

  284. 

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

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

  287.         /* SMPTE 379M 7.3 */

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

  289.             return i;

  290.     }

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

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

  293. }

  294. 

  295. /* XXX: use AVBitStreamFilter */

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

  297. {

  298.     const uint8_t *buf_ptr, *end_ptr;

  299.     uint8_t *data_ptr;

  300.     int i;

  301. 

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

  303.         return AVERROR_INVALIDDATA;

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

  305.     if (length < 0)

  306.         return length;

  307.     data_ptr = pkt->data;

  308.     end_ptr = pkt->data + length;

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

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

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

  312.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  315.             else

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

  317.         }

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

  319.     }

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

  321.     return 0;

  322. }

  323. 

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

  325. {

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

  327.     MXFContext *mxf = s->priv_data;

  328.     AVIOContext *pb = s->pb;

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

  330.     int64_t size;

  331.     uint64_t orig_size;

  332.     uint64_t plaintext_size;

  333.     uint8_t ivec[16];

  334.     uint8_t tmpbuf[16];

  335.     int index;

  336. 

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

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

  339.         if (!mxf->aesc)

  340.             return AVERROR(ENOMEM);

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

  342.     }

  343.     // crypto context

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

  345.     // plaintext offset

  346.     klv_decode_ber_length(pb);

  347.     plaintext_size = avio_rb64(pb);

  348.     // source klv key

  349.     klv_decode_ber_length(pb);

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

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

  352.         return AVERROR_INVALIDDATA;

  353.     index = mxf_get_stream_index(s, klv);

  354.     if (index < 0)

  355.         return AVERROR_INVALIDDATA;

  356.     // source size

  357.     klv_decode_ber_length(pb);

  358.     orig_size = avio_rb64(pb);

  359.     if (orig_size < plaintext_size)

  360.         return AVERROR_INVALIDDATA;

  361.     // enc. code

  362.     size = klv_decode_ber_length(pb);

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

  364.         return AVERROR_INVALIDDATA;

  365.     avio_read(pb, ivec, 16);

  366.     avio_read(pb, tmpbuf, 16);

  367.     if (mxf->aesc)

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

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

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

  371.     size -= 32;

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

  373.     if (size < 0)

  374.         return size;

  375.     else if (size < plaintext_size)

  376.         return AVERROR_INVALIDDATA;

  377.     size -= plaintext_size;

  378.     if (mxf->aesc)

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

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

  381.     av_shrink_packet(pkt, orig_size);

  382.     pkt->stream_index = index;

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

  384.     return 0;

  385. }

  386. 

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

  388. {

  389.     MXFContext *mxf = arg;

  390.     int item_num = avio_rb32(pb);

  391.     int item_len = avio_rb32(pb);

  392. 

  393.     if (item_len != 18) {

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

  395.                               item_len);

  396.         return AVERROR_PATCHWELCOME;

  397.     }

  398.     if (item_num > UINT_MAX / item_len)

  399.         return AVERROR_INVALIDDATA;

  400.     mxf->local_tags_count = item_num;

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

  402.     if (!mxf->local_tags)

  403.         return AVERROR(ENOMEM);

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

  405.     return 0;

  406. }

  407. 

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

  409. {

  410.     MXFContext *mxf = arg;

  411.     MXFPartition *partition, *tmp_part;

  412.     UID op;

  413.     uint64_t footer_partition;

  414.     uint32_t nb_essence_containers;

  415. 

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

  417.         return AVERROR(ENOMEM);

  418. 

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

  420.     if (!tmp_part)

  421.         return AVERROR(ENOMEM);

  422.     mxf->partitions = tmp_part;

  423. 

  424.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  431.     } else {

  432.         mxf->last_forward_partition++;

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

  434.     }

  435. 

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

  437.     mxf->partitions_count++;

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

  439. 

  440.     switch(uid[13]) {

  441.     case 2:

  442.         partition->type = Header;

  443.         break;

  444.     case 3:

  445.         partition->type = BodyPartition;

  446.         break;

  447.     case 4:

  448.         partition->type = Footer;

  449.         break;

  450.     default:

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

  452.         return AVERROR_INVALIDDATA;

  453.     }

  454. 

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

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

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

  458.     avio_skip(pb, 4);

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

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

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

  462.     footer_partition = avio_rb64(pb);

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

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

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

  466.     avio_skip(pb, 8);

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

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

  469.     nb_essence_containers = avio_rb32(pb);

  470. 

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

  472.     if (footer_partition) {

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

  474.             av_log(mxf->fc, AV_LOG_ERROR,

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

  476.                    mxf->footer_partition, footer_partition);

  477.         } else {

  478.             mxf->footer_partition = footer_partition;

  479.         }

  480.     }

  481. 

  482.     av_dlog(mxf->fc,

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

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

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

  486.             partition->this_partition,

  487.             partition->previous_partition, footer_partition,

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

  489. 

  490.     /* sanity check PreviousPartition if set */

  491.     if (partition->previous_partition &&

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

  493.         av_log(mxf->fc, AV_LOG_ERROR,

  494.                "PreviousPartition points to this partition or forward\n");

  495.         return AVERROR_INVALIDDATA;

  496.     }

  497. 

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

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

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

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

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

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

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

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

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

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

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

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

  510.          * 2011_DCPTEST_24FPS.V.mxf violates this and is frame wrapped, hence why we assume OP1a */

  511.         if (nb_essence_containers != 1) {

  512.             /* only nag once */

  513.             if (!mxf->op)

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

  515. 

  516.             mxf->op = OP1a;

  517.         } else

  518.             mxf->op = OPAtom;

  519.     } else {

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

  521.         mxf->op = OP1a;

  522.     }

  523. 

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

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

  526. 

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

  528.             partition->kag_size = 512;

  529.         else

  530.             partition->kag_size = 1;

  531. 

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

  533.     }

  534. 

  535.     return 0;

  536. }

  537. 

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

  539. {

  540.     MXFMetadataSet **tmp;

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

  542.         return AVERROR(ENOMEM);

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

  544.     if (!tmp)

  545.         return AVERROR(ENOMEM);

  546.     mxf->metadata_sets = tmp;

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

  548.     mxf->metadata_sets_count++;

  549.     return 0;

  550. }

  551. 

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

  553. {

  554.     MXFCryptoContext *cryptocontext = arg;

  555.     if (size != 16)

  556.         return AVERROR_INVALIDDATA;

  557.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  559.     return 0;

  560. }

  561. 

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

  563. {

  564.     MXFContext *mxf = arg;

  565.     switch (tag) {

  566.     case 0x1901:

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

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

  569.             return AVERROR_INVALIDDATA;

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

  571.         if (!mxf->packages_refs)

  572.             return AVERROR(ENOMEM);

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

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

  575.         break;

  576.     }

  577.     return 0;

  578. }

  579. 

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

  581. {

  582.     MXFStructuralComponent *source_clip = arg;

  583.     switch(tag) {

  584.     case 0x0202:

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

  586.         break;

  587.     case 0x1201:

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

  589.         break;

  590.     case 0x1101:

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

  592.         avio_skip(pb, 16);

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

  594.         break;

  595.     case 0x1102:

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

  597.         break;

  598.     }

  599.     return 0;

  600. }

  601. 

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

  603. {

  604.     MXFPackage *package = arg;

  605.     switch(tag) {

  606.     case 0x4403:

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

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

  609.             return AVERROR_INVALIDDATA;

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

  611.         if (!package->tracks_refs)

  612.             return AVERROR(ENOMEM);

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

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

  615.         break;

  616.     }

  617.     return 0;

  618. }

  619. 

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

  621. {

  622.     MXFTrack *track = arg;

  623.     switch(tag) {

  624.     case 0x4801:

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

  626.         break;

  627.     case 0x4804:

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

  629.         break;

  630.     case 0x4B01:

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

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

  633.         break;

  634.     case 0x4803:

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

  636.         break;

  637.     }

  638.     return 0;

  639. }

  640. 

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

  642. {

  643.     MXFSequence *sequence = arg;

  644.     switch(tag) {

  645.     case 0x0202:

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

  647.         break;

  648.     case 0x0201:

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

  650.         break;

  651.     case 0x1001:

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

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

  654.             return AVERROR_INVALIDDATA;

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

  656.         if (!sequence->structural_components_refs)

  657.             return AVERROR(ENOMEM);

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

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

  660.         break;

  661.     }

  662.     return 0;

  663. }

  664. 

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

  666. {

  667.     MXFPackage *package = arg;

  668.     switch(tag) {

  669.     case 0x4403:

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

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

  672.             return AVERROR_INVALIDDATA;

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

  674.         if (!package->tracks_refs)

  675.             return AVERROR(ENOMEM);

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

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

  678.         break;

  679.     case 0x4401:

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

  681.         avio_skip(pb, 16);

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

  683.         break;

  684.     case 0x4701:

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

  686.         break;

  687.     }

  688.     return 0;

  689. }

  690. 

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

  692. {

  693.     int i, length;

  694. 

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

  696.     length = avio_rb32(pb);

  697. 

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

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

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

  701.         return AVERROR(ENOMEM);

  702. 

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

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

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

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

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

  708.         avio_skip(pb, length - 11);

  709.     }

  710.     return 0;

  711. }

  712. 

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

  714. {

  715.     MXFIndexTableSegment *segment = arg;

  716.     switch(tag) {

  717.     case 0x3F05:

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

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

  720.         break;

  721.     case 0x3F06:

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

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

  724.         break;

  725.     case 0x3F07:

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

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

  728.         break;

  729.     case 0x3F0A:

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

  731.         return mxf_read_index_entry_array(pb, segment);

  732.     case 0x3F0B:

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

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

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

  736.                 segment->index_edit_rate.den);

  737.         break;

  738.     case 0x3F0C:

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

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

  741.         break;

  742.     case 0x3F0D:

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

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

  745.         break;

  746.     }

  747.     return 0;

  748. }

  749. 

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

  751. {

  752.     int code, value, ofs = 0;

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

  754. 

  755.     do {

  756.         code = avio_r8(pb);

  757.         value = avio_r8(pb);

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

  759. 

  760.         if (ofs < 16) {

  761.             layout[ofs++] = code;

  762.             layout[ofs++] = value;

  763.         }

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

  765. 

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

  767. }

  768. 

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

  770. {

  771.     MXFDescriptor *descriptor = arg;

  772.     switch(tag) {

  773.     case 0x3F01:

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

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

  776.             return AVERROR_INVALIDDATA;

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

  778.         if (!descriptor->sub_descriptors_refs)

  779.             return AVERROR(ENOMEM);

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

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

  782.         break;

  783.     case 0x3004:

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

  785.         break;

  786.     case 0x3006:

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

  788.         break;

  789.     case 0x3201: /* PictureEssenceCoding */

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

  791.         break;

  792.     case 0x3203:

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

  794.         break;

  795.     case 0x3202:

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

  797.         break;

  798.     case 0x320E:

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

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

  801.         break;

  802.     case 0x3D03:

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

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

  805.         break;

  806.     case 0x3D06: /* SoundEssenceCompression */

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

  808.         break;

  809.     case 0x3D07:

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

  811.         break;

  812.     case 0x3D01:

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

  814.         break;

  815.     case 0x3401:

  816.         mxf_read_pixel_layout(pb, descriptor);

  817.         break;

  818.     default:

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

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

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

  822.             if (!descriptor->extradata)

  823.                 return AVERROR(ENOMEM);

  824.             descriptor->extradata_size = size;

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

  826.         }

  827.         break;

  828.     }

  829.     return 0;

  830. }

  831. 

  832. /*

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

  834.  * Returns: boolean

  835.  */

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

  837. {

  838.     int i;

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

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

  841.             return 0;

  842.     }

  843.     return 1;

  844. }

  845. 

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

  847. {

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

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

  850.             break;

  851.         uls++;

  852.     }

  853.     return uls;

  854. }

  855. 

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

  857. {

  858.     int i;

  859. 

  860.     if (!strong_ref)

  861.         return NULL;

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

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

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

  865.             return mxf->metadata_sets[i];

  866.         }

  867.     }

  868.     return NULL;

  869. }

  870. 

  871. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  872.     // video essence container uls

  873.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  874.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

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

  876. };

  877. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  878.     // sound essence container uls

  879.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  880.     { { 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 */

  881.     { { 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 */

  882.     { { 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 */

  883.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  884. };

  885. 

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

  887. {

  888.     int i, j, nb_segments = 0;

  889.     MXFIndexTableSegment **unsorted_segments;

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

  891. 

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

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

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

  895.             nb_segments++;

  896. 

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

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

  899.         av_freep(sorted_segments);

  900.         av_free(unsorted_segments);

  901.         return AVERROR(ENOMEM);

  902.     }

  903. 

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

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

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

  907. 

  908.     *nb_sorted_segments = 0;

  909. 

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

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

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

  913. 

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

  915.             MXFIndexTableSegment *s = unsorted_segments[j];

  916. 

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

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

  919.              */

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

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

  922.                 best             = j;

  923.                 best_body_sid    = s->body_sid;

  924.                 best_index_sid   = s->index_sid;

  925.                 best_index_start = s->index_start_position;

  926.             }

  927.         }

  928. 

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

  930.         if (best == -1)

  931.             break;

  932. 

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

  934.         last_body_sid    = best_body_sid;

  935.         last_index_sid   = best_index_sid;

  936.         last_index_start = best_index_start;

  937.     }

  938. 

  939.     av_free(unsorted_segments);

  940. 

  941.     return 0;

  942. }

  943. 

  944. /**

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

  946.  */

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

  948. {

  949.     int x;

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

  951. 

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

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

  954. 

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

  956.             continue;

  957. 

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

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

  960.             return 0;

  961.         }

  962. 

  963.         offset -= p->essence_length;

  964.     }

  965. 

  966.     av_log(mxf->fc, AV_LOG_ERROR,

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

  968.            offset_in, body_sid);

  969. 

  970.     return AVERROR_INVALIDDATA;

  971. }

  972. 

  973. /**

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

  975.  */

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

  977. {

  978.     int x;

  979.     int64_t ret = 0;

  980. 

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

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

  983. 

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

  985.             continue;

  986. 

  987.         if (!p->essence_length)

  988.             return 0;

  989. 

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

  991.     }

  992. 

  993.     return ret;

  994. }

  995. 

  996. /* EditUnit -> absolute offset */

  997. 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)

  998. {

  999.     int i;

  1000.     int64_t offset_temp = 0;

  1001. 

  1002.     for (i = 0; i < index_table->nb_segments; i++) {

  1003.         MXFIndexTableSegment *s = index_table->segments[i];

  1004. 

  1005.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1006. 

  1007.         if (edit_unit < s->index_start_position + s->index_duration) {

  1008.             int64_t index = edit_unit - s->index_start_position;

  1009. 

  1010.             if (s->edit_unit_byte_count)

  1011.                 offset_temp += s->edit_unit_byte_count * index;

  1012.             else if (s->nb_index_entries) {

  1013.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1014.                     index *= 2;     /* Avid index */

  1015. 

  1016.                 if (index < 0 || index > s->nb_index_entries) {

  1017.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1018.                            index_table->index_sid, s->index_start_position);

  1019.                     return AVERROR_INVALIDDATA;

  1020.                 }

  1021. 

  1022.                 offset_temp = s->stream_offset_entries[index];

  1023.             } else {

  1024.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1025.                        index_table->index_sid, s->index_start_position);

  1026.                 return AVERROR_INVALIDDATA;

  1027.             }

  1028. 

  1029.             if (edit_unit_out)

  1030.                 *edit_unit_out = edit_unit;

  1031. 

  1032.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1033.         } else {

  1034.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1035.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1036.         }

  1037.     }

  1038. 

  1039.     if (nag)

  1040.         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);

  1041. 

  1042.     return AVERROR_INVALIDDATA;

  1043. }

  1044. 

  1045. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1046. {

  1047.     int i, j, x;

  1048.     int8_t max_temporal_offset = -128;

  1049. 

  1050.     /* first compute how many entries we have */

  1051.     for (i = 0; i < index_table->nb_segments; i++) {

  1052.         MXFIndexTableSegment *s = index_table->segments[i];

  1053. 

  1054.         if (!s->nb_index_entries) {

  1055.             index_table->nb_ptses = 0;

  1056.             return 0;                               /* no TemporalOffsets */

  1057.         }

  1058. 

  1059.         index_table->nb_ptses += s->index_duration;

  1060.     }

  1061. 

  1062.     /* paranoid check */

  1063.     if (index_table->nb_ptses <= 0)

  1064.         return 0;

  1065. 

  1066.     if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||

  1067.         !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {

  1068.         av_freep(&index_table->ptses);

  1069.         return AVERROR(ENOMEM);

  1070.     }

  1071. 

  1072.     /* we may have a few bad TemporalOffsets

  1073.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1074.     for (x = 0; x < index_table->nb_ptses; x++)

  1075.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1076. 

  1077.     /**

  1078.      * We have this:

  1079.      *

  1080.      * x  TemporalOffset

  1081.      * 0:  0

  1082.      * 1:  1

  1083.      * 2:  1

  1084.      * 3: -2

  1085.      * 4:  1

  1086.      * 5:  1

  1087.      * 6: -2

  1088.      *

  1089.      * We want to transform it into this:

  1090.      *

  1091.      * x  DTS PTS

  1092.      * 0: -1   0

  1093.      * 1:  0   3

  1094.      * 2:  1   1

  1095.      * 3:  2   2

  1096.      * 4:  3   6

  1097.      * 5:  4   4

  1098.      * 6:  5   5

  1099.      *

  1100.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1101.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1102.      * The latter makes DTS <= PTS.

  1103.      */

  1104.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1105.         MXFIndexTableSegment *s = index_table->segments[i];

  1106.         int index_delta = 1;

  1107.         int n = s->nb_index_entries;

  1108. 

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

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

  1111.             /* ignore the last entry - it's the size of the essence container */

  1112.             n--;

  1113.         }

  1114. 

  1115.         for (j = 0; j < n; j += index_delta, x++) {

  1116.             int offset = s->temporal_offset_entries[j] / index_delta;

  1117.             int index  = x + offset;

  1118. 

  1119.             if (x >= index_table->nb_ptses) {

  1120.                 av_log(mxf->fc, AV_LOG_ERROR,

  1121.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1122.                        s->nb_index_entries, s->index_duration);

  1123.                 break;

  1124.             }

  1125. 

  1126.             index_table->fake_index[x].timestamp = x;

  1127.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1128. 

  1129.             if (index < 0 || index >= index_table->nb_ptses) {

  1130.                 av_log(mxf->fc, AV_LOG_ERROR,

  1131.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1132.                        x, offset, index);

  1133.                 continue;

  1134.             }

  1135. 

  1136.             index_table->ptses[index] = x;

  1137.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1138.         }

  1139.     }

  1140. 

  1141.     index_table->first_dts = -max_temporal_offset;

  1142. 

  1143.     return 0;

  1144. }

  1145. 

  1146. /**

  1147.  * Sorts and collects index table segments into index tables.

  1148.  * Also computes PTSes if possible.

  1149.  */

  1150. static int mxf_compute_index_tables(MXFContext *mxf)

  1151. {

  1152.     int i, j, k, ret, nb_sorted_segments;

  1153.     MXFIndexTableSegment **sorted_segments = NULL;

  1154. 

  1155.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1156.         nb_sorted_segments <= 0) {

  1157.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1158.         return 0;

  1159.     }

  1160. 

  1161.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1162.     for (i = 0; i < nb_sorted_segments; i++) {

  1163.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1164.             mxf->nb_index_tables++;

  1165.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1166.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1167.             ret = AVERROR_INVALIDDATA;

  1168.             goto finish_decoding_index;

  1169.         }

  1170.     }

  1171. 

  1172.     if (!(mxf->index_tables = av_calloc(mxf->nb_index_tables, sizeof(MXFIndexTable)))) {

  1173.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1174.         ret = AVERROR(ENOMEM);

  1175.         goto finish_decoding_index;

  1176.     }

  1177. 

  1178.     /* distribute sorted segments to index tables */

  1179.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1180.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1181.             /* next IndexSID */

  1182.             j++;

  1183.         }

  1184. 

  1185.         mxf->index_tables[j].nb_segments++;

  1186.     }

  1187. 

  1188.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1189.         MXFIndexTable *t = &mxf->index_tables[j];

  1190. 

  1191.         if (!(t->segments = av_calloc(t->nb_segments, sizeof(MXFIndexTableSegment*)))) {

  1192.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment pointer array\n");

  1193.             ret = AVERROR(ENOMEM);

  1194.             goto finish_decoding_index;

  1195.         }

  1196. 

  1197.         if (sorted_segments[i]->index_start_position)

  1198.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1199.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1200. 

  1201.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1202.         t->index_sid = sorted_segments[i]->index_sid;

  1203.         t->body_sid = sorted_segments[i]->body_sid;

  1204. 

  1205.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1206.             goto finish_decoding_index;

  1207. 

  1208.         /* fix zero IndexDurations */

  1209.         for (k = 0; k < t->nb_segments; k++) {

  1210.             if (t->segments[k]->index_duration)

  1211.                 continue;

  1212. 

  1213.             if (t->nb_segments > 1)

  1214.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1215.                        t->index_sid, k);

  1216. 

  1217.             if (mxf->fc->nb_streams <= 0) {

  1218.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1219.                 break;

  1220.             }

  1221. 

  1222.             /* assume the first stream's duration is reasonable

  1223.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1224.              */

  1225.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1226.             break;

  1227.         }

  1228.     }

  1229. 

  1230.     ret = 0;

  1231. finish_decoding_index:

  1232.     av_free(sorted_segments);

  1233.     return ret;

  1234. }

  1235. 

  1236. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1237. {

  1238.     MXFPackage *material_package = NULL;

  1239.     MXFPackage *temp_package = NULL;

  1240.     int i, j, k, ret;

  1241. 

  1242.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1243.     /* TODO: handle multiple material packages (OP3x) */

  1244.     for (i = 0; i < mxf->packages_count; i++) {

  1245.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1246.         if (material_package) break;

  1247.     }

  1248.     if (!material_package) {

  1249.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1250.         return AVERROR_INVALIDDATA;

  1251.     }

  1252. 

  1253.     for (i = 0; i < material_package->tracks_count; i++) {

  1254.         MXFPackage *source_package = NULL;

  1255.         MXFTrack *material_track = NULL;

  1256.         MXFTrack *source_track = NULL;

  1257.         MXFTrack *temp_track = NULL;

  1258.         MXFDescriptor *descriptor = NULL;

  1259.         MXFStructuralComponent *component = NULL;

  1260.         UID *essence_container_ul = NULL;

  1261.         const MXFCodecUL *codec_ul = NULL;

  1262.         const MXFCodecUL *container_ul = NULL;

  1263.         AVStream *st;

  1264. 

  1265.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1266.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1267.             continue;

  1268.         }

  1269. 

  1270.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1271.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1272.             continue;

  1273.         }

  1274. 

  1275.         /* TODO: handle multiple source clips */

  1276.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1277.             /* TODO: handle timecode component */

  1278.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1279.             if (!component)

  1280.                 continue;

  1281. 

  1282.             for (k = 0; k < mxf->packages_count; k++) {

  1283.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1284.                 if (!temp_package)

  1285.                     continue;

  1286.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1287.                     source_package = temp_package;

  1288.                     break;

  1289.                 }

  1290.             }

  1291.             if (!source_package) {

  1292.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1293.                 break;

  1294.             }

  1295.             for (k = 0; k < source_package->tracks_count; k++) {

  1296.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1297.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1298.                     ret = AVERROR_INVALIDDATA;

  1299.                     goto fail_and_free;

  1300.                 }

  1301.                 if (temp_track->track_id == component->source_track_id) {

  1302.                     source_track = temp_track;

  1303.                     break;

  1304.                 }

  1305.             }

  1306.             if (!source_track) {

  1307.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1308.                 break;

  1309.             }

  1310.         }

  1311.         if (!source_track || !component)

  1312.             continue;

  1313. 

  1314.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1315.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1316.             ret = AVERROR_INVALIDDATA;

  1317.             goto fail_and_free;

  1318.         }

  1319. 

  1320.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1321.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1322.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1323.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1324.             continue;

  1325.         }

  1326. 

  1327.         st = avformat_new_stream(mxf->fc, NULL);

  1328.         if (!st) {

  1329.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1330.             ret = AVERROR(ENOMEM);

  1331.             goto fail_and_free;

  1332.         }

  1333.         st->id = source_track->track_id;

  1334.         st->priv_data = source_track;

  1335.         st->duration = component->duration;

  1336.         if (st->duration == -1)

  1337.             st->duration = AV_NOPTS_VALUE;

  1338.         st->start_time = component->start_position;

  1339.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1340. 

  1341.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1342.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1343.         st->codec->codec_type = codec_ul->id;

  1344. 

  1345.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1346.         if (source_package->descriptor) {

  1347.             if (source_package->descriptor->type == MultipleDescriptor) {

  1348.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1349.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1350. 

  1351.                     if (!sub_descriptor) {

  1352.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1353.                         continue;

  1354.                     }

  1355.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1356.                         descriptor = sub_descriptor;

  1357.                         break;

  1358.                     }

  1359.                 }

  1360.             } else if (source_package->descriptor->type == Descriptor)

  1361.                 descriptor = source_package->descriptor;

  1362.         }

  1363.         if (!descriptor) {

  1364.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1365.             continue;

  1366.         }

  1367.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1368.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1369.         essence_container_ul = &descriptor->essence_container_ul;

  1370.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1371.          * is not allowed according to s429-6, try to find correct information anyway */

  1372.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1373.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

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

  1375.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1376.                 if (metadata->type == CryptoContext) {

  1377.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1378.                     break;

  1379.                 }

  1380.             }

  1381.         }

  1382. 

  1383.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1384.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1385.         st->codec->codec_id = codec_ul->id;

  1386.         if (descriptor->extradata) {

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

  1388.             st->codec->extradata_size = descriptor->extradata_size;

  1389.         }

  1390.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1391.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

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

  1393.                 st->codec->codec_id = container_ul->id;

  1394.             st->codec->width = descriptor->width;

  1395.             st->codec->height = descriptor->height;

  1396.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1397.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1398.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1399.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1400.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1401.             if (st->codec->codec_id == CODEC_ID_NONE)

  1402.                 st->codec->codec_id = container_ul->id;

  1403.             st->codec->channels = descriptor->channels;

  1404.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1405. 

  1406.             if (descriptor->sample_rate.den > 0)

  1407.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1408. 

  1409.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1410.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1411.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1412.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1413.                 else if (descriptor->bits_per_sample == 32)

  1414.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1415.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1416.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1417.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1418.                 else if (descriptor->bits_per_sample == 32)

  1419.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1420.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1421.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1422.             }

  1423.         }

  1424.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1425.             /* TODO: decode timestamps */

  1426.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1427.         }

  1428.     }

  1429. 

  1430.     ret = 0;

  1431. fail_and_free:

  1432.     return ret;

  1433. }

  1434. 

  1435. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

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

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

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

  1439.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1440.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1441.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1442.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1443.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1444.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1445.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1446.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1447.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1448.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1449.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1450.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1451.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1452.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1453.     { { 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 */

  1454.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1455.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1456.     { { 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 */

  1457.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1458.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1459.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1460.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1461.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1462.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1463.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1464. };

  1465. 

  1466. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1467. {

  1468.     AVIOContext *pb = mxf->fc->pb;

  1469.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1470.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1471. 

  1472.     if (!ctx)

  1473.         return AVERROR(ENOMEM);

  1474.     while (avio_tell(pb) + 4 < klv_end && !url_feof(pb)) {

  1475.         int ret;

  1476.         int tag = avio_rb16(pb);

  1477.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1478.         uint64_t next = avio_tell(pb) + size;

  1479.         UID uid = {0};

  1480. 

  1481.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1482.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1483.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1484.             continue;

  1485.         }

  1486.         if (tag > 0x7FFF) { /* dynamic tag */

  1487.             int i;

  1488.             for (i = 0; i < mxf->local_tags_count; i++) {

  1489.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1490.                 if (local_tag == tag) {

  1491.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1492.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1493.                     PRINT_KEY(mxf->fc, "uid", uid);

  1494.                 }

  1495.             }

  1496.         }

  1497.         if (ctx_size && tag == 0x3C0A)

  1498.             avio_read(pb, ctx->uid, 16);

  1499.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1500.             return ret;

  1501. 

  1502.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1503.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1504.         if (avio_tell(pb) > klv_end) {

  1505.             av_log(mxf->fc, AV_LOG_ERROR,

  1506.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1507.                    tag, klv->offset);

  1508.             return AVERROR_INVALIDDATA;

  1509.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1510.             avio_seek(pb, next, SEEK_SET);

  1511.     }

  1512.     if (ctx_size) ctx->type = type;

  1513.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1514. }

  1515. 

  1516. /**

  1517.  * Seeks to the previous partition, if possible

  1518.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1519.  */

  1520. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1521. {

  1522.     AVIOContext *pb = mxf->fc->pb;

  1523. 

  1524.     if (!mxf->current_partition ||

  1525.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1526.         return 0;   /* we've parsed all partitions */

  1527. 

  1528.     /* seek to previous partition */

  1529.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1530.     mxf->current_partition = NULL;

  1531. 

  1532.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1533. 

  1534.     return 1;

  1535. }

  1536. 

  1537. /**

  1538.  * Called when essence is encountered

  1539.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1540.  */

  1541. static int mxf_parse_handle_essence(MXFContext *mxf)

  1542. {

  1543.     AVIOContext *pb = mxf->fc->pb;

  1544.     int64_t ret;

  1545. 

  1546.     if (mxf->parsing_backward) {

  1547.         return mxf_seek_to_previous_partition(mxf);

  1548.     } else {

  1549.         if (!mxf->footer_partition) {

  1550.             av_dlog(mxf->fc, "no footer\n");

  1551.             return 0;

  1552.         }

  1553. 

  1554.         av_dlog(mxf->fc, "seeking to footer\n");

  1555. 

  1556.         /* remember where we were so we don't end up seeking further back than this */

  1557.         mxf->last_forward_tell = avio_tell(pb);

  1558. 

  1559.         if (!pb->seekable) {

  1560.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1561.             return -1;

  1562.         }

  1563. 

  1564.         /* seek to footer partition and parse backward */

  1565.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1566.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1567.                    mxf->run_in + mxf->footer_partition, ret);

  1568.             return ret;

  1569.         }

  1570. 

  1571.         mxf->current_partition = NULL;

  1572.         mxf->parsing_backward = 1;

  1573.     }

  1574. 

  1575.     return 1;

  1576. }

  1577. 

  1578. /**

  1579.  * Called when the next partition or EOF is encountered

  1580.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1581.  */

  1582. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1583. {

  1584.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1585. }

  1586. 

  1587. /**

  1588.  * Figures out the proper offset and length of the essence container in each partition

  1589.  */

  1590. static void mxf_compute_essence_containers(MXFContext *mxf)

  1591. {

  1592.     int x;

  1593. 

  1594.     /* everything is already correct */

  1595.     if (mxf->op == OPAtom)

  1596.         return;

  1597. 

  1598.     for (x = 0; x < mxf->partitions_count; x++) {

  1599.         MXFPartition *p = &mxf->partitions[x];

  1600. 

  1601.         if (!p->body_sid)

  1602.             continue;       /* BodySID == 0 -> no essence */

  1603. 

  1604.         if (x >= mxf->partitions_count - 1)

  1605.             break;          /* last partition - can't compute length (and we don't need to) */

  1606. 

  1607.         /* essence container spans to the next partition */

  1608.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1609. 

  1610.         if (p->essence_length < 0) {

  1611.             /* next ThisPartition < essence_offset */

  1612.             p->essence_length = 0;

  1613.             av_log(mxf->fc, AV_LOG_ERROR,

  1614.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1615.                    x+1, mxf->partitions[x+1].this_partition);

  1616.         }

  1617.     }

  1618. }

  1619. 

  1620. static int64_t round_to_kag(int64_t position, int kag_size)

  1621. {

  1622.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1623.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1624.     int64_t ret = (position / kag_size) * kag_size;

  1625.     return ret == position ? ret : ret + kag_size;

  1626. }

  1627. 

  1628. static int is_pcm(enum CodecID codec_id)

  1629. {

  1630.     /* we only care about "normal" PCM codecs until we get samples */

  1631.     return codec_id >= CODEC_ID_PCM_S16LE && codec_id < CODEC_ID_PCM_S24DAUD;

  1632. }

  1633. 

  1634. /**

  1635.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1636.  * very small (2, 4..). In those cases we should read more than one

  1637.  * sample per call to mxf_read_packet().

  1638.  */

  1639. static void mxf_handle_small_eubc(AVFormatContext *s)

  1640. {

  1641.     MXFContext *mxf = s->priv_data;

  1642. 

  1643.     /* assuming non-OPAtom == frame wrapped

  1644.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1645.     if (mxf->op != OPAtom)

  1646.         return;

  1647. 

  1648.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1649.     if (s->nb_streams != 1                                     ||

  1650.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1651.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1652.         mxf->nb_index_tables != 1                              ||

  1653.         mxf->index_tables[0].nb_segments != 1                  ||

  1654.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1655.         return;

  1656. 

  1657.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1658.     /* TODO: We could compute this from the ratio between the audio

  1659.      *       and video edit rates for 48 kHz NTSC we could use the

  1660.      *       1802-1802-1802-1802-1801 pattern. */

  1661.     mxf->edit_units_per_packet = 1920;

  1662. }

  1663. 

  1664. static int mxf_read_header(AVFormatContext *s)

  1665. {

  1666.     MXFContext *mxf = s->priv_data;

  1667.     KLVPacket klv;

  1668.     int64_t essence_offset = 0;

  1669.     int ret;

  1670. 

  1671.     mxf->last_forward_tell = INT64_MAX;

  1672.     mxf->edit_units_per_packet = 1;

  1673. 

  1674.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1675.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1676.         return AVERROR_INVALIDDATA;

  1677.     }

  1678.     avio_seek(s->pb, -14, SEEK_CUR);

  1679.     mxf->fc = s;

  1680.     mxf->run_in = avio_tell(s->pb);

  1681. 

  1682.     while (!url_feof(s->pb)) {

  1683.         const MXFMetadataReadTableEntry *metadata;

  1684. 

  1685.         if (klv_read_packet(&klv, s->pb) < 0) {

  1686.             /* EOF - seek to previous partition or stop */

  1687.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1688.                 break;

  1689.             else

  1690.                 continue;

  1691.         }

  1692. 

  1693.         PRINT_KEY(s, "read header", klv.key);

  1694.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1695.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1696.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1697.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1698.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1699. 

  1700.             if (!mxf->current_partition) {

  1701.                 av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");

  1702.                 return AVERROR_INVALIDDATA;

  1703.             }

  1704. 

  1705.             if (!mxf->current_partition->essence_offset) {

  1706.                 /* for OP1a we compute essence_offset

  1707.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1708.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1709.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1710.                  */

  1711.                 int64_t op1a_essence_offset =

  1712.                     round_to_kag(mxf->current_partition->this_partition +

  1713.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1714.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1715.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1716. 

  1717.                 if (mxf->op == OPAtom) {

  1718.                     /* point essence_offset to the actual data

  1719.                     * OPAtom has all the essence in one big KLV

  1720.                     */

  1721.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1722.                     mxf->current_partition->essence_length = klv.length;

  1723.                 } else {

  1724.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1725.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1726.                 }

  1727.             }

  1728. 

  1729.             if (!essence_offset)

  1730.                 essence_offset = klv.offset;

  1731. 

  1732.             /* seek to footer, previous partition or stop */

  1733.             if (mxf_parse_handle_essence(mxf) <= 0)

  1734.                 break;

  1735.             continue;

  1736.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1737.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1738.             /* next partition pack - keep going, seek to previous partition or stop */

  1739.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1740.                 break;

  1741.         }

  1742. 

  1743.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1744.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1745.                 int res;

  1746.                 if (klv.key[5] == 0x53) {

  1747.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1748.                 } else {

  1749.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1750.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1751. 

  1752.                     /* only seek forward, else this can loop for a long time */

  1753.                     if (avio_tell(s->pb) > next) {

  1754.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1755.                                klv.offset);

  1756.                         return AVERROR_INVALIDDATA;

  1757.                     }

  1758. 

  1759.                     avio_seek(s->pb, next, SEEK_SET);

  1760.                 }

  1761.                 if (res < 0) {

  1762.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1763.                     return res;

  1764.                 }

  1765.                 break;

  1766.             }

  1767.         }

  1768.         if (!metadata->read)

  1769.             avio_skip(s->pb, klv.length);

  1770.     }

  1771.     /* FIXME avoid seek */

  1772.     if (!essence_offset)  {

  1773.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1774.         return AVERROR_INVALIDDATA;

  1775.     }

  1776.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1777. 

  1778.     mxf_compute_essence_containers(mxf);

  1779. 

  1780.     /* we need to do this before computing the index tables

  1781.      * to be able to fill in zero IndexDurations with st->duration */

  1782.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1783.         return ret;

  1784. 

  1785.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1786.         return ret;

  1787. 

  1788.     if (mxf->nb_index_tables > 1) {

  1789.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1790.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1791.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1792.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1793.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1794.         return AVERROR_INVALIDDATA;

  1795.     }

  1796. 

  1797.     mxf_handle_small_eubc(s);

  1798. 

  1799.     return 0;

  1800. }

  1801. 

  1802. /**

  1803.  * Computes DTS and PTS for the given video packet based on its offset.

  1804.  */

  1805. static void mxf_packet_timestamps(MXFContext *mxf, AVPacket *pkt)

  1806. {

  1807.     int64_t last_ofs = -1, next_ofs;

  1808.     MXFIndexTable *t = &mxf->index_tables[0];

  1809. 

  1810.     /* this is called from the OP1a demuxing logic, which means there

  1811.      * may be no index tables */

  1812.     if (mxf->nb_index_tables <= 0)

  1813.         return;

  1814. 

  1815.     /* find mxf->current_edit_unit so that the next edit unit starts ahead of pkt->pos */

  1816.     while (mxf->current_edit_unit >= 0) {

  1817.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_ofs, 0) < 0)

  1818.             break;

  1819. 

  1820.         if (next_ofs <= last_ofs) {

  1821.             /* large next_ofs didn't change or current_edit_unit wrapped

  1822.              * around this fixes the infinite loop on zzuf3.mxf */

  1823.             av_log(mxf->fc, AV_LOG_ERROR,

  1824.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1825.             return;

  1826.         }

  1827. 

  1828.         if (next_ofs > pkt->pos)

  1829.             break;

  1830. 

  1831.         last_ofs = next_ofs;

  1832.         mxf->current_edit_unit++;

  1833.     }

  1834. 

  1835.     if (mxf->current_edit_unit < 0 || mxf->current_edit_unit >= t->nb_ptses)

  1836.         return;

  1837. 

  1838.     pkt->dts = mxf->current_edit_unit + t->first_dts;

  1839.     pkt->pts = t->ptses[mxf->current_edit_unit];

  1840. }

  1841. 

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

  1843. {

  1844.     KLVPacket klv;

  1845. 

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

  1847.         int ret;

  1848.         if (klv_read_packet(&klv, s->pb) < 0)

  1849.             return -1;

  1850.         PRINT_KEY(s, "read packet", klv.key);

  1851.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1852.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1853.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  1854.             if (ret < 0) {

  1855.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1856.                 return AVERROR_INVALIDDATA;

  1857.             }

  1858.             return 0;

  1859.         }

  1860.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1861.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  1862.             int index = mxf_get_stream_index(s, &klv);

  1863.             if (index < 0) {

  1864.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  1865.                 goto skip;

  1866.             }

  1867.             if (s->streams[index]->discard == AVDISCARD_ALL)

  1868.                 goto skip;

  1869.             /* check for 8 channels AES3 element */

  1870.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  1871.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  1872.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  1873.                     return AVERROR_INVALIDDATA;

  1874.                 }

  1875.             } else {

  1876.                 ret = av_get_packet(s->pb, pkt, klv.length);

  1877.                 if (ret < 0)

  1878.                     return ret;

  1879.             }

  1880.             pkt->stream_index = index;

  1881.             pkt->pos = klv.offset;

  1882. 

  1883.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)

  1884.                 mxf_packet_timestamps(s->priv_data, pkt);   /* offset -> EditUnit -> DTS/PTS */

  1885. 

  1886.             return 0;

  1887.         } else

  1888.         skip:

  1889.             avio_skip(s->pb, klv.length);

  1890.     }

  1891.     return AVERROR_EOF;

  1892. }

  1893. 

  1894. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1895. {

  1896.     MXFContext *mxf = s->priv_data;

  1897.     int ret, size;

  1898.     int64_t ret64, pos, next_pos;

  1899.     AVStream *st;

  1900.     MXFIndexTable *t;

  1901.     int edit_units;

  1902. 

  1903.     if (mxf->op != OPAtom)

  1904.         return mxf_read_packet_old(s, pkt);

  1905. 

  1906.     /* OPAtom - clip wrapped demuxing */

  1907.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  1908.     st = s->streams[0];

  1909.     t = &mxf->index_tables[0];

  1910. 

  1911.     if (mxf->current_edit_unit >= st->duration)

  1912.         return AVERROR_EOF;

  1913. 

  1914.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  1915. 

  1916.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  1917.         return ret;

  1918. 

  1919.     /* compute size by finding the next edit unit or the end of the essence container

  1920.      * not pretty, but it works */

  1921.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  1922.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  1923.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  1924.         return AVERROR_INVALIDDATA;

  1925.     }

  1926. 

  1927.     if ((size = next_pos - pos) <= 0) {

  1928.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  1929.         return AVERROR_INVALIDDATA;

  1930.     }

  1931. 

  1932.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  1933.         return ret64;

  1934. 

  1935.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  1936.             return ret < 0 ? ret : AVERROR_EOF;

  1937. 

  1938.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  1939.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  1940.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  1941.         pkt->pts = t->ptses[mxf->current_edit_unit];

  1942.     }

  1943. 

  1944.     pkt->stream_index = 0;

  1945.     mxf->current_edit_unit += edit_units;

  1946. 

  1947.     return 0;

  1948. }

  1949. 

  1950. static int mxf_read_close(AVFormatContext *s)

  1951. {

  1952.     MXFContext *mxf = s->priv_data;

  1953.     MXFIndexTableSegment *seg;

  1954.     int i;

  1955. 

  1956.     av_freep(&mxf->packages_refs);

  1957. 

  1958.     for (i = 0; i < s->nb_streams; i++)

  1959.         s->streams[i]->priv_data = NULL;

  1960. 

  1961.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1962.         switch (mxf->metadata_sets[i]->type) {

  1963.         case MultipleDescriptor:

  1964.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1965.             break;

  1966.         case Sequence:

  1967.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1968.             break;

  1969.         case SourcePackage:

  1970.         case MaterialPackage:

  1971.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1972.             break;

  1973.         case IndexTableSegment:

  1974.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1975.             av_freep(&seg->temporal_offset_entries);

  1976.             av_freep(&seg->flag_entries);

  1977.             av_freep(&seg->stream_offset_entries);

  1978.             break;

  1979.         default:

  1980.             break;

  1981.         }

  1982.         av_freep(&mxf->metadata_sets[i]);

  1983.     }

  1984.     av_freep(&mxf->partitions);

  1985.     av_freep(&mxf->metadata_sets);

  1986.     av_freep(&mxf->aesc);

  1987.     av_freep(&mxf->local_tags);

  1988. 

  1989.     for (i = 0; i < mxf->nb_index_tables; i++) {

  1990.         av_freep(&mxf->index_tables[i].segments);

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

  1992.         av_freep(&mxf->index_tables[i].fake_index);

  1993.     }

  1994.     av_freep(&mxf->index_tables);

  1995. 

  1996.     return 0;

  1997. }

  1998. 

  1999. static int mxf_probe(AVProbeData *p) {

  2000.     uint8_t *bufp = p->buf;

  2001.     uint8_t *end = p->buf + p->buf_size;

  2002. 

  2003.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2004.         return 0;

  2005. 

  2006.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2007.     end -= sizeof(mxf_header_partition_pack_key);

  2008.     for (; bufp < end; bufp++) {

  2009.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2010.             return AVPROBE_SCORE_MAX;

  2011.     }

  2012.     return 0;

  2013. }

  2014. 

  2015. /* rudimentary byte seek */

  2016. /* XXX: use MXF Index */

  2017. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2018. {

  2019.     AVStream *st = s->streams[stream_index];

  2020.     int64_t seconds;

  2021.     MXFContext* mxf = s->priv_data;

  2022.     int64_t seekpos;

  2023.     int ret;

  2024.     MXFIndexTable *t;

  2025. 

  2026.     if (mxf->index_tables <= 0) {

  2027.     if (!s->bit_rate)

  2028.         return AVERROR_INVALIDDATA;

  2029.     if (sample_time < 0)

  2030.         sample_time = 0;

  2031.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2032. 

  2033.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  2034.         return ret;

  2035.     ff_update_cur_dts(s, st, sample_time);

  2036.     } else {

  2037.         t = &mxf->index_tables[0];

  2038. 

  2039.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2040.          * this also means we allow seeking before the start */

  2041.         sample_time = FFMAX(sample_time, 0);

  2042. 

  2043.         if (t->fake_index) {

  2044.             /* behave as if we have a proper index */

  2045.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2046.                 return sample_time;

  2047.         } else {

  2048.             /* no IndexEntryArray (one or more CBR segments)

  2049.              * make sure we don't seek past the end */

  2050.             sample_time = FFMIN(sample_time, st->duration - 1);

  2051.         }

  2052. 

  2053.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2054.             return ret;

  2055. 

  2056.         ff_update_cur_dts(s, st, sample_time);

  2057.         mxf->current_edit_unit = sample_time;

  2058.         avio_seek(s->pb, seekpos, SEEK_SET);

  2059.     }

  2060.     return 0;

  2061. }

  2062. 

  2063. AVInputFormat ff_mxf_demuxer = {

  2064.     .name           = "mxf",

  2065.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  2066.     .priv_data_size = sizeof(MXFContext),

  2067.     .read_probe     = mxf_probe,

  2068.     .read_header    = mxf_read_header,

  2069.     .read_packet    = mxf_read_packet,

  2070.     .read_close     = mxf_read_close,

  2071.     .read_seek      = mxf_read_seek,

  2072. };