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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. #include <inttypes.h>

  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 MXFPartition {

  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 MXFCryptoContext {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct MXFStructuralComponent {

  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 MXFSequence {

  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.     uint8_t origin;

  115. } MXFSequence;

  116. 

  117. typedef struct MXFTrack {

  118.     UID uid;

  119.     enum MXFMetadataSetType type;

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

  121.     UID sequence_ref;

  122.     int track_id;

  123.     uint8_t track_number[4];

  124.     AVRational edit_rate;

  125.     int intra_only;

  126.     uint64_t sample_count;

  127.     int64_t original_duration; /* st->duration in SampleRate/EditRate units */

  128. } MXFTrack;

  129. 

  130. typedef struct MXFDescriptor {

  131.     UID uid;

  132.     enum MXFMetadataSetType type;

  133.     UID essence_container_ul;

  134.     UID essence_codec_ul;

  135.     AVRational sample_rate;

  136.     AVRational aspect_ratio;

  137.     int width;

  138.     int height; /* Field height, not frame height */

  139.     int frame_layout; /* See MXFFrameLayout enum */

  140. #define MXF_TFF 1

  141. #define MXF_BFF 2

  142.     int field_dominance;

  143.     int channels;

  144.     int bits_per_sample;

  145.     unsigned int component_depth;

  146.     unsigned int horiz_subsampling;

  147.     unsigned int vert_subsampling;

  148.     UID *sub_descriptors_refs;

  149.     int sub_descriptors_count;

  150.     int linked_track_id;

  151.     uint8_t *extradata;

  152.     int extradata_size;

  153.     enum AVPixelFormat pix_fmt;

  154. } MXFDescriptor;

  155. 

  156. typedef struct MXFIndexTableSegment {

  157.     UID uid;

  158.     enum MXFMetadataSetType type;

  159.     int edit_unit_byte_count;

  160.     int index_sid;

  161.     int body_sid;

  162.     AVRational index_edit_rate;

  163.     uint64_t index_start_position;

  164.     uint64_t index_duration;

  165.     int8_t *temporal_offset_entries;

  166.     int *flag_entries;

  167.     uint64_t *stream_offset_entries;

  168.     int nb_index_entries;

  169. } MXFIndexTableSegment;

  170. 

  171. typedef struct MXFPackage {

  172.     UID uid;

  173.     enum MXFMetadataSetType type;

  174.     UID package_uid;

  175.     UID *tracks_refs;

  176.     int tracks_count;

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

  178.     UID descriptor_ref;

  179. } MXFPackage;

  180. 

  181. typedef struct MXFMetadataSet {

  182.     UID uid;

  183.     enum MXFMetadataSetType type;

  184. } MXFMetadataSet;

  185. 

  186. /* decoded index table */

  187. typedef struct MXFIndexTable {

  188.     int index_sid;

  189.     int body_sid;

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

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

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

  193.     int nb_segments;

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

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

  196. } MXFIndexTable;

  197. 

  198. typedef struct MXFContext {

  199.     MXFPartition *partitions;

  200.     unsigned partitions_count;

  201.     MXFOP op;

  202.     UID *packages_refs;

  203.     int packages_count;

  204.     MXFMetadataSet **metadata_sets;

  205.     int metadata_sets_count;

  206.     AVFormatContext *fc;

  207.     struct AVAES *aesc;

  208.     uint8_t *local_tags;

  209.     int local_tags_count;

  210.     uint64_t last_partition;

  211.     uint64_t footer_partition;

  212.     KLVPacket current_klv_data;

  213.     int current_klv_index;

  214.     int run_in;

  215.     MXFPartition *current_partition;

  216.     int parsing_backward;

  217.     int64_t last_forward_tell;

  218.     int last_forward_partition;

  219.     int current_edit_unit;

  220.     int nb_index_tables;

  221.     MXFIndexTable *index_tables;

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

  223. } MXFContext;

  224. 

  225. enum MXFWrappingScheme {

  226.     Frame,

  227.     Clip,

  228. };

  229. 

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

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

  232. 

  233. typedef struct MXFMetadataReadTableEntry {

  234.     const UID key;

  235.     MXFMetadataReadFunc *read;

  236.     int ctx_size;

  237.     enum MXFMetadataSetType type;

  238. } MXFMetadataReadTableEntry;

  239. 

  240. /* partial keys to match */

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

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

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

  244. static const uint8_t mxf_system_item_key[]                 = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x03,0x01,0x04 };

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

  246. /* complete keys to match */

  247. 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 };

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

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

  250. static const uint8_t mxf_random_index_pack_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };

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

  252. 

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

  254. 

  255. static int64_t klv_decode_ber_length(AVIOContext *pb)

  256. {

  257.     uint64_t size = avio_r8(pb);

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

  259.         int bytes_num = size & 0x7f;

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

  261.         if (bytes_num > 8)

  262.             return AVERROR_INVALIDDATA;

  263.         size = 0;

  264.         while (bytes_num--)

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

  266.     }

  267.     return size;

  268. }

  269. 

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

  271. {

  272.     int i, b;

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

  274.         b = avio_r8(pb);

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

  276.             i = 0;

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

  278.             i = -1;

  279.     }

  280.     return i == size;

  281. }

  282. 

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

  284. {

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

  286.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  292. }

  293. 

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

  295. {

  296.     int i;

  297. 

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

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

  300.         /* SMPTE 379M 7.3 */

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

  302.             return i;

  303.     }

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

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

  306. }

  307. 

  308. /* XXX: use AVBitStreamFilter */

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

  310. {

  311.     const uint8_t *buf_ptr, *end_ptr;

  312.     uint8_t *data_ptr;

  313.     int i;

  314. 

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

  316.         return AVERROR_INVALIDDATA;

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

  318.     if (length < 0)

  319.         return length;

  320.     data_ptr = pkt->data;

  321.     end_ptr = pkt->data + length;

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

  323.     for (; end_ptr - buf_ptr >= st->codecpar->channels * 4; ) {

  324.         for (i = 0; i < st->codecpar->channels; i++) {

  325.             uint32_t sample = bytestream_get_le32(&buf_ptr);

  326.             if (st->codecpar->bits_per_coded_sample == 24)

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

  328.             else

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

  330.         }

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

  332.     }

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

  334.     return 0;

  335. }

  336. 

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

  338. {

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

  340.     MXFContext *mxf = s->priv_data;

  341.     AVIOContext *pb = s->pb;

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

  343.     int64_t size;

  344.     uint64_t orig_size;

  345.     uint64_t plaintext_size;

  346.     uint8_t ivec[16];

  347.     uint8_t tmpbuf[16];

  348.     int index;

  349. 

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

  351.         mxf->aesc = av_aes_alloc();

  352.         if (!mxf->aesc)

  353.             return AVERROR(ENOMEM);

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

  355.     }

  356.     // crypto context

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

  358.     // plaintext offset

  359.     klv_decode_ber_length(pb);

  360.     plaintext_size = avio_rb64(pb);

  361.     // source klv key

  362.     klv_decode_ber_length(pb);

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

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

  365.         return AVERROR_INVALIDDATA;

  366.     index = mxf_get_stream_index(s, klv);

  367.     if (index < 0)

  368.         return AVERROR_INVALIDDATA;

  369.     // source size

  370.     klv_decode_ber_length(pb);

  371.     orig_size = avio_rb64(pb);

  372.     if (orig_size < plaintext_size)

  373.         return AVERROR_INVALIDDATA;

  374.     // enc. code

  375.     size = klv_decode_ber_length(pb);

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

  377.         return AVERROR_INVALIDDATA;

  378.     avio_read(pb, ivec, 16);

  379.     avio_read(pb, tmpbuf, 16);

  380.     if (mxf->aesc)

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

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

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

  384.     size -= 32;

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

  386.     if (size < 0)

  387.         return size;

  388.     else if (size < plaintext_size)

  389.         return AVERROR_INVALIDDATA;

  390.     size -= plaintext_size;

  391.     if (mxf->aesc)

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

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

  394.     av_shrink_packet(pkt, orig_size);

  395.     pkt->stream_index = index;

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

  397.     return 0;

  398. }

  399. 

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

  401. {

  402.     MXFContext *mxf = arg;

  403.     int item_num = avio_rb32(pb);

  404.     int item_len = avio_rb32(pb);

  405. 

  406.     if (item_len != 18) {

  407.         avpriv_request_sample(pb, "Primer pack item length %d", item_len);

  408.         return AVERROR_PATCHWELCOME;

  409.     }

  410.     if (item_num > UINT_MAX / item_len)

  411.         return AVERROR_INVALIDDATA;

  412.     mxf->local_tags_count = item_num;

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

  414.     if (!mxf->local_tags)

  415.         return AVERROR(ENOMEM);

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

  417.     return 0;

  418. }

  419. 

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

  421. {

  422.     MXFContext *mxf = arg;

  423.     MXFPartition *partition;

  424.     UID op;

  425.     uint64_t footer_partition;

  426.     uint32_t nb_essence_containers;

  427.     int err;

  428. 

  429.     if ((err = av_reallocp_array(&mxf->partitions, mxf->partitions_count + 1,

  430.                                  sizeof(*mxf->partitions))) < 0) {

  431.         mxf->partitions_count = 0;

  432.         return err;

  433.     }

  434. 

  435.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  442.     } else {

  443.         mxf->last_forward_partition++;

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

  445.     }

  446. 

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

  448.     mxf->partitions_count++;

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

  450. 

  451.     switch(uid[13]) {

  452.     case 2:

  453.         partition->type = Header;

  454.         break;

  455.     case 3:

  456.         partition->type = BodyPartition;

  457.         break;

  458.     case 4:

  459.         partition->type = Footer;

  460.         break;

  461.     default:

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

  463.         return AVERROR_INVALIDDATA;

  464.     }

  465. 

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

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

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

  469.     avio_skip(pb, 4);

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

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

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

  473.     footer_partition = avio_rb64(pb);

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

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

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

  477.     avio_skip(pb, 8);

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

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

  480.     nb_essence_containers = avio_rb32(pb);

  481. 

  482.     if (partition->this_partition &&

  483.         partition->previous_partition == partition->this_partition) {

  484.         av_log(mxf->fc, AV_LOG_ERROR,

  485.                "PreviousPartition equal to ThisPartition %"PRIx64"\n",

  486.                partition->previous_partition);

  487.         /* override with the actual previous partition offset */

  488.         if (!mxf->parsing_backward && mxf->last_forward_partition > 1) {

  489.             MXFPartition *prev =

  490.                 mxf->partitions + mxf->last_forward_partition - 2;

  491.             partition->previous_partition = prev->this_partition;

  492.         }

  493.         /* if no previous body partition are found point to the header

  494.          * partition */

  495.         if (partition->previous_partition == partition->this_partition)

  496.             partition->previous_partition = 0;

  497.         av_log(mxf->fc, AV_LOG_ERROR,

  498.                "Overriding PreviousPartition with %"PRIx64"\n",

  499.                partition->previous_partition);

  500.     }

  501. 

  502.     /* some files don't have FooterPartition set in every partition */

  503.     if (footer_partition) {

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

  505.             av_log(mxf->fc, AV_LOG_ERROR,

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

  507.                    mxf->footer_partition, footer_partition);

  508.         } else {

  509.             mxf->footer_partition = footer_partition;

  510.         }

  511.     }

  512. 

  513.     av_log(mxf->fc, AV_LOG_TRACE,

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

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

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

  517.             partition->this_partition,

  518.             partition->previous_partition, footer_partition,

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

  520. 

  521.     /* sanity check PreviousPartition if set */

  522.     if (partition->previous_partition &&

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

  524.         av_log(mxf->fc, AV_LOG_ERROR,

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

  526.         return AVERROR_INVALIDDATA;

  527.     }

  528. 

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

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

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

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

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

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

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

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

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

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

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

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

  541.          * The following block deals with files that violate this, namely:

  542.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

  543.          * abcdefghiv016f56415e.mxf - zero ECs, OPAtom, output by Avid AirSpeed */

  544.         if (nb_essence_containers != 1) {

  545.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  546. 

  547.             /* only nag once */

  548.             if (!mxf->op)

  549.                 av_log(mxf->fc, AV_LOG_WARNING,

  550.                        "\"OPAtom\" with %"PRIu32" ECs - assuming %s\n",

  551.                        nb_essence_containers,

  552.                        op == OP1a ? "OP1a" : "OPAtom");

  553. 

  554.             mxf->op = op;

  555.         } else

  556.             mxf->op = OPAtom;

  557.     } else {

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

  559.         mxf->op = OP1a;

  560.     }

  561. 

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

  563.         av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %"PRId32" - guessing ",

  564.                partition->kag_size);

  565. 

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

  567.             partition->kag_size = 512;

  568.         else

  569.             partition->kag_size = 1;

  570. 

  571.         av_log(mxf->fc, AV_LOG_WARNING, "%"PRId32"\n", partition->kag_size);

  572.     }

  573. 

  574.     return 0;

  575. }

  576. 

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

  578. {

  579.     int err;

  580. 

  581.     if ((err = av_reallocp_array(&mxf->metadata_sets, mxf->metadata_sets_count + 1,

  582.                                  sizeof(*mxf->metadata_sets))) < 0) {

  583.         mxf->metadata_sets_count = 0;

  584.         return err;

  585.     }

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

  587.     mxf->metadata_sets_count++;

  588.     return 0;

  589. }

  590. 

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

  592. {

  593.     MXFCryptoContext *cryptocontext = arg;

  594.     if (size != 16)

  595.         return AVERROR_INVALIDDATA;

  596.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  598.     return 0;

  599. }

  600. 

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

  602. {

  603.     MXFContext *mxf = arg;

  604.     switch (tag) {

  605.     case 0x1901:

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

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

  608.             return AVERROR_INVALIDDATA;

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

  610.         if (!mxf->packages_refs)

  611.             return AVERROR(ENOMEM);

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

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

  614.         break;

  615.     }

  616.     return 0;

  617. }

  618. 

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

  620. {

  621.     MXFStructuralComponent *source_clip = arg;

  622.     switch(tag) {

  623.     case 0x0202:

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

  625.         break;

  626.     case 0x1201:

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

  628.         break;

  629.     case 0x1101:

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

  631.         avio_skip(pb, 16);

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

  633.         break;

  634.     case 0x1102:

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

  636.         break;

  637.     }

  638.     return 0;

  639. }

  640. 

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

  642. {

  643.     MXFPackage *package = arg;

  644.     switch(tag) {

  645.     case 0x4403:

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

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

  648.             return AVERROR_INVALIDDATA;

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

  650.         if (!package->tracks_refs)

  651.             return AVERROR(ENOMEM);

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

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

  654.         break;

  655.     }

  656.     return 0;

  657. }

  658. 

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

  660. {

  661.     MXFTrack *track = arg;

  662.     switch(tag) {

  663.     case 0x4801:

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

  665.         break;

  666.     case 0x4804:

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

  668.         break;

  669.     case 0x4b01:

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

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

  672.         break;

  673.     case 0x4803:

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

  675.         break;

  676.     }

  677.     return 0;

  678. }

  679. 

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

  681. {

  682.     MXFSequence *sequence = arg;

  683.     switch(tag) {

  684.     case 0x0202:

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

  686.         break;

  687.     case 0x0201:

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

  689.         break;

  690.         case 0x4b02:

  691.         sequence->origin = avio_r8(pb);

  692.         break;

  693.     case 0x1001:

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

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

  696.             return AVERROR_INVALIDDATA;

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

  698.         if (!sequence->structural_components_refs)

  699.             return AVERROR(ENOMEM);

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

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

  702.         break;

  703.     }

  704.     return 0;

  705. }

  706. 

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

  708. {

  709.     MXFPackage *package = arg;

  710.     switch(tag) {

  711.     case 0x4403:

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

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

  714.             return AVERROR_INVALIDDATA;

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

  716.         if (!package->tracks_refs)

  717.             return AVERROR(ENOMEM);

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

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

  720.         break;

  721.     case 0x4401:

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

  723.         avio_skip(pb, 16);

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

  725.         break;

  726.     case 0x4701:

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

  728.         break;

  729.     }

  730.     return 0;

  731. }

  732. 

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

  734. {

  735.     int i, length;

  736. 

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

  738.     if (!segment->nb_index_entries)

  739.         return 0;

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

  741.              segment->nb_index_entries >

  742.              (INT_MAX / sizeof(*segment->stream_offset_entries)))

  743.         return AVERROR(ENOMEM);

  744. 

  745.     length = avio_rb32(pb);

  746. 

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

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

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

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

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

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

  753. 

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

  755.         !segment->temporal_offset_entries) {

  756.         av_freep(&segment->flag_entries);

  757.         av_freep(&segment->stream_offset_entries);

  758.         av_freep(&segment->temporal_offset_entries);

  759.         return AVERROR(ENOMEM);

  760.     }

  761. 

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

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

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

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

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

  767.         avio_skip(pb, length - 11);

  768.     }

  769.     return 0;

  770. }

  771. 

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

  773. {

  774.     MXFIndexTableSegment *segment = arg;

  775.     switch(tag) {

  776.     case 0x3F05:

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

  778.         av_log(NULL, AV_LOG_TRACE, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);

  779.         break;

  780.     case 0x3F06:

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

  782.         av_log(NULL, AV_LOG_TRACE, "IndexSID %d\n", segment->index_sid);

  783.         break;

  784.     case 0x3F07:

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

  786.         av_log(NULL, AV_LOG_TRACE, "BodySID %d\n", segment->body_sid);

  787.         break;

  788.     case 0x3F0A:

  789.         av_log(NULL, AV_LOG_TRACE, "IndexEntryArray found\n");

  790.         return mxf_read_index_entry_array(pb, segment);

  791.     case 0x3F0B:

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

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

  794.         av_log(NULL, AV_LOG_TRACE, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,

  795.                 segment->index_edit_rate.den);

  796.         break;

  797.     case 0x3F0C:

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

  799.         av_log(NULL, AV_LOG_TRACE, "IndexStartPosition %"PRId64"\n", segment->index_start_position);

  800.         break;

  801.     case 0x3F0D:

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

  803.         av_log(NULL, AV_LOG_TRACE, "IndexDuration %"PRId64"\n", segment->index_duration);

  804.         break;

  805.     }

  806.     return 0;

  807. }

  808. 

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

  810. {

  811.     int code, value, ofs = 0;

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

  813. 

  814.     do {

  815.         code = avio_r8(pb);

  816.         value = avio_r8(pb);

  817.         av_log(NULL, AV_LOG_TRACE, "pixel layout: code %#x\n", code);

  818. 

  819.         if (ofs <= 14) {

  820.             layout[ofs++] = code;

  821.             layout[ofs++] = value;

  822.         }

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

  824. 

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

  826. }

  827. 

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

  829. {

  830.     MXFDescriptor *descriptor = arg;

  831.     descriptor->pix_fmt = AV_PIX_FMT_NONE;

  832.     switch(tag) {

  833.     case 0x3F01:

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

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

  836.             return AVERROR_INVALIDDATA;

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

  838.         if (!descriptor->sub_descriptors_refs)

  839.             return AVERROR(ENOMEM);

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

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

  842.         break;

  843.     case 0x3004:

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

  845.         break;

  846.     case 0x3006:

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

  848.         break;

  849.     case 0x3201: /* PictureEssenceCoding */

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

  851.         break;

  852.     case 0x3203:

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

  854.         break;

  855.     case 0x3202:

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

  857.         break;

  858.     case 0x320C:

  859.         descriptor->frame_layout = avio_r8(pb);

  860.         break;

  861.     case 0x320E:

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

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

  864.         break;

  865.     case 0x3212:

  866.         descriptor->field_dominance = avio_r8(pb);

  867.         break;

  868.     case 0x3301:

  869.         descriptor->component_depth = avio_rb32(pb);

  870.         break;

  871.     case 0x3302:

  872.         descriptor->horiz_subsampling = avio_rb32(pb);

  873.         break;

  874.     case 0x3308:

  875.         descriptor->vert_subsampling = avio_rb32(pb);

  876.         break;

  877.     case 0x3D03:

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

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

  880.         break;

  881.     case 0x3D06: /* SoundEssenceCompression */

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

  883.         break;

  884.     case 0x3D07:

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

  886.         break;

  887.     case 0x3D01:

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

  889.         break;

  890.     case 0x3401:

  891.         mxf_read_pixel_layout(pb, descriptor);

  892.         break;

  893.     default:

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

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

  896.             av_free(descriptor->extradata);

  897.             descriptor->extradata_size = 0;

  898.             descriptor->extradata = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);

  899.             if (!descriptor->extradata)

  900.                 return AVERROR(ENOMEM);

  901.             descriptor->extradata_size = size;

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

  903.         }

  904.         break;

  905.     }

  906.     return 0;

  907. }

  908. 

  909. /*

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

  911.  * Returns: boolean

  912.  */

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

  914. {

  915.     int i;

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

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

  918.             return 0;

  919.     }

  920.     return 1;

  921. }

  922. 

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

  924. {

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

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

  927.             break;

  928.         uls++;

  929.     }

  930.     return uls;

  931. }

  932. 

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

  934. {

  935.     int i;

  936. 

  937.     if (!strong_ref)

  938.         return NULL;

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

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

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

  942.             return mxf->metadata_sets[i];

  943.         }

  944.     }

  945.     return NULL;

  946. }

  947. 

  948. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  949.     // video essence container uls

  950.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES frame-wrapped */

  951.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  952.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* uncompressed picture */

  953.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  954. };

  955. 

  956. /* EC ULs for intra-only formats */

  957. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  958.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 mappings */

  959.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  960. };

  961. 

  962. /* intra-only PictureEssenceCoding ULs, where no corresponding EC UL exists */

  963. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  964.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  965.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG 2000 code stream */

  966.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  967. };

  968. 

  969. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  970.     // sound essence container uls

  971.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  972.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  973.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  974.     { { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0xff,0x4b,0x46,0x41,0x41,0x00,0x0d,0x4d,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  975.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x03,0x04,0x02,0x02,0x02,0x03,0x03,0x01,0x00 }, 14,       AV_CODEC_ID_AAC }, /* MPEG-2 AAC ADTS (legacy) */

  976.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  977. };

  978. 

  979. static const MXFCodecUL mxf_data_essence_container_uls[] = {

  980.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x0e,0x00,0x00 }, 16, 0 },

  981.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x0e,0x00,0x00 }, 16, AV_CODEC_ID_NONE },

  982. };

  983. 

  984. static const char * const mxf_data_essence_descriptor[] = {

  985.     "vbi_vanc_smpte_436M",

  986. };

  987. 

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

  989. {

  990.     int i, j, nb_segments = 0;

  991.     MXFIndexTableSegment **unsorted_segments;

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

  993. 

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

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

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

  997.             nb_segments++;

  998. 

  999.     if (!nb_segments)

  1000.         return AVERROR_INVALIDDATA;

  1001. 

  1002.     *sorted_segments  = av_mallocz(nb_segments * sizeof(**sorted_segments));

  1003.     unsorted_segments = av_mallocz(nb_segments * sizeof(*unsorted_segments));

  1004.     if (!*sorted_segments || !unsorted_segments) {

  1005.         av_freep(sorted_segments);

  1006.         av_free(unsorted_segments);

  1007.         return AVERROR(ENOMEM);

  1008.     }

  1009. 

  1010.     for (i = j = 0; i < mxf->metadata_sets_count; i++)

  1011.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  1012.             unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];

  1013. 

  1014.     *nb_sorted_segments = 0;

  1015. 

  1016.     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */

  1017.     for (i = 0; i < nb_segments; i++) {

  1018.         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;

  1019.         uint64_t best_index_duration = 0;

  1020. 

  1021.         for (j = 0; j < nb_segments; j++) {

  1022.             MXFIndexTableSegment *s = unsorted_segments[j];

  1023. 

  1024.             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.

  1025.              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.

  1026.              * If we come across an entry with the same IndexStartPosition but larger IndexDuration, then we'll prefer it over the one we currently have.

  1027.              */

  1028.             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&

  1029.                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start ||

  1030.                 (s->index_start_position == best_index_start && s->index_duration > best_index_duration))) {

  1031.                 best             = j;

  1032.                 best_body_sid    = s->body_sid;

  1033.                 best_index_sid   = s->index_sid;

  1034.                 best_index_start = s->index_start_position;

  1035.                 best_index_duration = s->index_duration;

  1036.             }

  1037.         }

  1038. 

  1039.         /* no suitable entry found -> we're done */

  1040.         if (best == -1)

  1041.             break;

  1042. 

  1043.         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];

  1044.         last_body_sid    = best_body_sid;

  1045.         last_index_sid   = best_index_sid;

  1046.         last_index_start = best_index_start;

  1047.     }

  1048. 

  1049.     av_free(unsorted_segments);

  1050. 

  1051.     return 0;

  1052. }

  1053. 

  1054. /**

  1055.  * Computes the absolute file offset of the given essence container offset

  1056.  */

  1057. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1058. {

  1059.     int x;

  1060.     int64_t offset_in = offset;     /* for logging */

  1061. 

  1062.     for (x = 0; x < mxf->partitions_count; x++) {

  1063.         MXFPartition *p = &mxf->partitions[x];

  1064. 

  1065.         if (p->body_sid != body_sid)

  1066.             continue;

  1067. 

  1068.         if (offset < p->essence_length || !p->essence_length) {

  1069.             *offset_out = p->essence_offset + offset;

  1070.             return 0;

  1071.         }

  1072. 

  1073.         offset -= p->essence_length;

  1074.     }

  1075. 

  1076.     av_log(mxf->fc, AV_LOG_ERROR,

  1077.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1078.            offset_in, body_sid);

  1079. 

  1080.     return AVERROR_INVALIDDATA;

  1081. }

  1082. 

  1083. /**

  1084.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1085.  */

  1086. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1087. {

  1088.     int x;

  1089.     int64_t ret = 0;

  1090. 

  1091.     for (x = 0; x < mxf->partitions_count; x++) {

  1092.         MXFPartition *p = &mxf->partitions[x];

  1093. 

  1094.         if (p->body_sid != body_sid)

  1095.             continue;

  1096. 

  1097.         if (!p->essence_length)

  1098.             return 0;

  1099. 

  1100.         ret = p->essence_offset + p->essence_length;

  1101.     }

  1102. 

  1103.     return ret;

  1104. }

  1105. 

  1106. /* EditUnit -> absolute offset */

  1107. 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)

  1108. {

  1109.     int i;

  1110.     int64_t offset_temp = 0;

  1111. 

  1112.     for (i = 0; i < index_table->nb_segments; i++) {

  1113.         MXFIndexTableSegment *s = index_table->segments[i];

  1114. 

  1115.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1116. 

  1117.         if (edit_unit < s->index_start_position + s->index_duration) {

  1118.             int64_t index = edit_unit - s->index_start_position;

  1119. 

  1120.             if (s->edit_unit_byte_count)

  1121.                 offset_temp += s->edit_unit_byte_count * index;

  1122.             else if (s->nb_index_entries) {

  1123.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1124.                     index *= 2;     /* Avid index */

  1125. 

  1126.                 if (index < 0 || index >= s->nb_index_entries) {

  1127.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1128.                            index_table->index_sid, s->index_start_position);

  1129.                     return AVERROR_INVALIDDATA;

  1130.                 }

  1131. 

  1132.                 offset_temp = s->stream_offset_entries[index];

  1133.             } else {

  1134.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1135.                        index_table->index_sid, s->index_start_position);

  1136.                 return AVERROR_INVALIDDATA;

  1137.             }

  1138. 

  1139.             if (edit_unit_out)

  1140.                 *edit_unit_out = edit_unit;

  1141. 

  1142.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1143.         } else {

  1144.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1145.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1146.         }

  1147.     }

  1148. 

  1149.     if (nag)

  1150.         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);

  1151. 

  1152.     return AVERROR_INVALIDDATA;

  1153. }

  1154. 

  1155. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1156. {

  1157.     int i, j, x;

  1158.     int8_t max_temporal_offset = -128;

  1159. 

  1160.     /* first compute how many entries we have */

  1161.     for (i = 0; i < index_table->nb_segments; i++) {

  1162.         MXFIndexTableSegment *s = index_table->segments[i];

  1163. 

  1164.         if (!s->nb_index_entries) {

  1165.             index_table->nb_ptses = 0;

  1166.             return 0;                               /* no TemporalOffsets */

  1167.         }

  1168. 

  1169.         index_table->nb_ptses += s->index_duration;

  1170.     }

  1171. 

  1172.     /* paranoid check */

  1173.     if (index_table->nb_ptses <= 0)

  1174.         return 0;

  1175. 

  1176.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1177.         return AVERROR(ENOMEM);

  1178. 

  1179.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1180.                                          sizeof(int64_t));

  1181.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1182.                                          sizeof(AVIndexEntry));

  1183.     if (!index_table->ptses || !index_table->fake_index) {

  1184.         av_freep(&index_table->ptses);

  1185.         return AVERROR(ENOMEM);

  1186.     }

  1187. 

  1188.     /* we may have a few bad TemporalOffsets

  1189.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1190.     for (x = 0; x < index_table->nb_ptses; x++)

  1191.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1192. 

  1193.     /**

  1194.      * We have this:

  1195.      *

  1196.      * x  TemporalOffset

  1197.      * 0:  0

  1198.      * 1:  1

  1199.      * 2:  1

  1200.      * 3: -2

  1201.      * 4:  1

  1202.      * 5:  1

  1203.      * 6: -2

  1204.      *

  1205.      * We want to transform it into this:

  1206.      *

  1207.      * x  DTS PTS

  1208.      * 0: -1   0

  1209.      * 1:  0   3

  1210.      * 2:  1   1

  1211.      * 3:  2   2

  1212.      * 4:  3   6

  1213.      * 5:  4   4

  1214.      * 6:  5   5

  1215.      *

  1216.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1217.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1218.      * The latter makes DTS <= PTS.

  1219.      */

  1220.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1221.         MXFIndexTableSegment *s = index_table->segments[i];

  1222.         int index_delta = 1;

  1223.         int n = s->nb_index_entries;

  1224. 

  1225.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1226.             index_delta = 2;    /* Avid index */

  1227.             /* ignore the last entry - it's the size of the essence container */

  1228.             n--;

  1229.         }

  1230. 

  1231.         for (j = 0; j < n; j += index_delta, x++) {

  1232.             int offset = s->temporal_offset_entries[j] / index_delta;

  1233.             int index  = x + offset;

  1234. 

  1235.             if (x >= index_table->nb_ptses) {

  1236.                 av_log(mxf->fc, AV_LOG_ERROR,

  1237.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1238.                        s->nb_index_entries, s->index_duration);

  1239.                 break;

  1240.             }

  1241. 

  1242.             index_table->fake_index[x].timestamp = x;

  1243.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1244. 

  1245.             if (index < 0 || index >= index_table->nb_ptses) {

  1246.                 av_log(mxf->fc, AV_LOG_ERROR,

  1247.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1248.                        x, offset, index);

  1249.                 continue;

  1250.             }

  1251. 

  1252.             index_table->ptses[index] = x;

  1253.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1254.         }

  1255.     }

  1256. 

  1257.     index_table->first_dts = -max_temporal_offset;

  1258. 

  1259.     return 0;

  1260. }

  1261. 

  1262. /**

  1263.  * Sorts and collects index table segments into index tables.

  1264.  * Also computes PTSes if possible.

  1265.  */

  1266. static int mxf_compute_index_tables(MXFContext *mxf)

  1267. {

  1268.     int i, j, k, ret, nb_sorted_segments;

  1269.     MXFIndexTableSegment **sorted_segments = NULL;

  1270. 

  1271.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1272.         nb_sorted_segments <= 0) {

  1273.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1274.         return 0;

  1275.     }

  1276. 

  1277.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1278.     for (i = 0; i < nb_sorted_segments; i++) {

  1279.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1280.             mxf->nb_index_tables++;

  1281.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1282.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1283.             ret = AVERROR_INVALIDDATA;

  1284.             goto finish_decoding_index;

  1285.         }

  1286.     }

  1287. 

  1288.     mxf->index_tables = av_mallocz_array(mxf->nb_index_tables,

  1289.                                          sizeof(*mxf->index_tables));

  1290.     if (!mxf->index_tables) {

  1291.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1292.         ret = AVERROR(ENOMEM);

  1293.         goto finish_decoding_index;

  1294.     }

  1295. 

  1296.     /* distribute sorted segments to index tables */

  1297.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1298.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1299.             /* next IndexSID */

  1300.             j++;

  1301.         }

  1302. 

  1303.         mxf->index_tables[j].nb_segments++;

  1304.     }

  1305. 

  1306.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1307.         MXFIndexTable *t = &mxf->index_tables[j];

  1308. 

  1309.         t->segments = av_mallocz_array(t->nb_segments,

  1310.                                        sizeof(*t->segments));

  1311. 

  1312.         if (!t->segments) {

  1313.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1314.                    " pointer array\n");

  1315.             ret = AVERROR(ENOMEM);

  1316.             goto finish_decoding_index;

  1317.         }

  1318. 

  1319.         if (sorted_segments[i]->index_start_position)

  1320.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1321.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1322. 

  1323.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1324.         t->index_sid = sorted_segments[i]->index_sid;

  1325.         t->body_sid = sorted_segments[i]->body_sid;

  1326. 

  1327.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1328.             goto finish_decoding_index;

  1329. 

  1330.         /* fix zero IndexDurations */

  1331.         for (k = 0; k < t->nb_segments; k++) {

  1332.             if (t->segments[k]->index_duration)

  1333.                 continue;

  1334. 

  1335.             if (t->nb_segments > 1)

  1336.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1337.                        t->index_sid, k);

  1338. 

  1339.             if (mxf->fc->nb_streams <= 0) {

  1340.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1341.                 break;

  1342.             }

  1343. 

  1344.             /* assume the first stream's duration is reasonable

  1345.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1346.              */

  1347.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1348.             break;

  1349.         }

  1350.     }

  1351. 

  1352.     ret = 0;

  1353. finish_decoding_index:

  1354.     av_free(sorted_segments);

  1355.     return ret;

  1356. }

  1357. 

  1358. static int mxf_is_intra_only(MXFDescriptor *d)

  1359. {

  1360.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1361.                             &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||

  1362.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1363.                             &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;

  1364. }

  1365. 

  1366. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1367. {

  1368.     MXFPackage *material_package = NULL;

  1369.     MXFPackage *temp_package = NULL;

  1370.     int i, j, k, ret;

  1371. 

  1372.     av_log(mxf->fc, AV_LOG_TRACE, "metadata sets count %d\n", mxf->metadata_sets_count);

  1373.     /* TODO: handle multiple material packages (OP3x) */

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

  1375.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1376.         if (material_package) break;

  1377.     }

  1378.     if (!material_package) {

  1379.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1380.         return AVERROR_INVALIDDATA;

  1381.     }

  1382. 

  1383.     for (i = 0; i < material_package->tracks_count; i++) {

  1384.         MXFPackage *source_package = NULL;

  1385.         MXFTrack *material_track = NULL;

  1386.         MXFTrack *source_track = NULL;

  1387.         MXFTrack *temp_track = NULL;

  1388.         MXFDescriptor *descriptor = NULL;

  1389.         MXFStructuralComponent *component = NULL;

  1390.         UID *essence_container_ul = NULL;

  1391.         const MXFCodecUL *codec_ul = NULL;

  1392.         const MXFCodecUL *container_ul = NULL;

  1393.         const MXFCodecUL *pix_fmt_ul = NULL;

  1394.         AVStream *st;

  1395. 

  1396.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1397.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1398.             continue;

  1399.         }

  1400. 

  1401.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1402.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1403.             continue;

  1404.         }

  1405. 

  1406.         /* TODO: handle multiple source clips */

  1407.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1408.             /* TODO: handle timecode component */

  1409.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1410.             if (!component)

  1411.                 continue;

  1412. 

  1413.             for (k = 0; k < mxf->packages_count; k++) {

  1414.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1415.                 if (!temp_package)

  1416.                     continue;

  1417.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1418.                     source_package = temp_package;

  1419.                     break;

  1420.                 }

  1421.             }

  1422.             if (!source_package) {

  1423.                 av_log(mxf->fc, AV_LOG_TRACE, "material track %d: no corresponding source package found\n", material_track->track_id);

  1424.                 break;

  1425.             }

  1426.             for (k = 0; k < source_package->tracks_count; k++) {

  1427.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1428.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1429.                     ret = AVERROR_INVALIDDATA;

  1430.                     goto fail_and_free;

  1431.                 }

  1432.                 if (temp_track->track_id == component->source_track_id) {

  1433.                     source_track = temp_track;

  1434.                     break;

  1435.                 }

  1436.             }

  1437.             if (!source_track) {

  1438.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1439.                 break;

  1440.             }

  1441.         }

  1442.         if (!source_track || !component)

  1443.             continue;

  1444. 

  1445.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1446.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1447.             ret = AVERROR_INVALIDDATA;

  1448.             goto fail_and_free;

  1449.         }

  1450. 

  1451.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1452.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1453.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1454.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1455.             continue;

  1456.         }

  1457. 

  1458.         st = avformat_new_stream(mxf->fc, NULL);

  1459.         if (!st) {

  1460.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1461.             ret = AVERROR(ENOMEM);

  1462.             goto fail_and_free;

  1463.         }

  1464.         st->id = source_track->track_id;

  1465.         st->priv_data = source_track;

  1466.         source_track->original_duration = st->duration = component->duration;

  1467.         if (st->duration == -1)

  1468.             st->duration = AV_NOPTS_VALUE;

  1469.         st->start_time = component->start_position;

  1470.         if (material_track->edit_rate.num <= 0 ||

  1471.             material_track->edit_rate.den <= 0) {

  1472.             av_log(mxf->fc, AV_LOG_WARNING,

  1473.                    "Invalid edit rate (%d/%d) found on stream #%d, "

  1474.                    "defaulting to 25/1\n",

  1475.                    material_track->edit_rate.num,

  1476.                    material_track->edit_rate.den, st->index);

  1477.             material_track->edit_rate = (AVRational){25, 1};

  1478.         }

  1479.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1480. 

  1481.         /* ensure SourceTrack EditRate == MaterialTrack EditRate since only

  1482.          * the former is accessible via st->priv_data */

  1483.         source_track->edit_rate = material_track->edit_rate;

  1484. 

  1485.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1486.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1487.         st->codecpar->codec_type = codec_ul->id;

  1488. 

  1489.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1490.         if (source_package->descriptor) {

  1491.             if (source_package->descriptor->type == MultipleDescriptor) {

  1492.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1493.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1494. 

  1495.                     if (!sub_descriptor) {

  1496.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1497.                         continue;

  1498.                     }

  1499.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1500.                         descriptor = sub_descriptor;

  1501.                         break;

  1502.                     }

  1503.                 }

  1504.             } else if (source_package->descriptor->type == Descriptor)

  1505.                 descriptor = source_package->descriptor;

  1506.         }

  1507.         if (!descriptor) {

  1508.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1509.             continue;

  1510.         }

  1511.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1512.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1513.         essence_container_ul = &descriptor->essence_container_ul;

  1514.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1515.          * is not allowed according to s429-6, try to find correct information anyway */

  1516.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1517.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1518.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1519.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1520.                 if (metadata->type == CryptoContext) {

  1521.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1522.                     break;

  1523.                 }

  1524.             }

  1525.         }

  1526. 

  1527.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1528.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1529.         st->codecpar->codec_id = codec_ul->id;

  1530. 

  1531.         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {

  1532.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1533.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1534.             if (st->codecpar->codec_id == AV_CODEC_ID_NONE)

  1535.                 st->codecpar->codec_id = container_ul->id;

  1536.             st->codecpar->width = descriptor->width;

  1537.             /* Field height, not frame height */

  1538.             st->codecpar->height = descriptor->height;

  1539.             switch (descriptor->frame_layout) {

  1540.                 case SegmentedFrame:

  1541.                     /* This one is a weird layout I don't fully understand. */

  1542.                     av_log(mxf->fc, AV_LOG_INFO,

  1543.                            "SegmentedFrame layout isn't currently supported\n");

  1544.                     break;

  1545.                 case FullFrame:

  1546.                     st->codecpar->field_order = AV_FIELD_PROGRESSIVE;

  1547.                     break;

  1548.                 case OneField:

  1549.                     /* Every other line is stored and needs to be duplicated. */

  1550.                     av_log(mxf->fc, AV_LOG_INFO,

  1551.                            "OneField frame layout isn't currently supported\n");

  1552.                     break;

  1553.                     /* The correct thing to do here is fall through, but by

  1554.                      * breaking we might be able to decode some streams at half

  1555.                      * the vertical resolution, rather than not al all.

  1556.                      * It's also for compatibility with the old behavior. */

  1557.                 case SeparateFields:

  1558.                 case MixedFields:

  1559.                     switch (descriptor->field_dominance) {

  1560.                     case MXF_TFF:

  1561.                         st->codecpar->field_order = AV_FIELD_TT;

  1562.                         break;

  1563.                     case MXF_BFF:

  1564.                         st->codecpar->field_order = AV_FIELD_BB;

  1565.                         break;

  1566.                     default:

  1567.                         avpriv_request_sample(mxf->fc,

  1568.                                               "Field dominance %d support",

  1569.                                               descriptor->field_dominance);

  1570.                         break;

  1571.                     }

  1572.                     /* Turn field height into frame height. */

  1573.                     st->codecpar->height *= 2;

  1574.                     break;

  1575.                 default:

  1576.                     av_log(mxf->fc, AV_LOG_INFO,

  1577.                            "Unknown frame layout type: %d\n",

  1578.                            descriptor->frame_layout);

  1579.             }

  1580.             if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO) {

  1581.                 st->codecpar->format = descriptor->pix_fmt;

  1582.                 if (st->codecpar->format == AV_PIX_FMT_NONE) {

  1583.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,

  1584.                                                   &descriptor->essence_codec_ul);

  1585.                     st->codecpar->format = pix_fmt_ul->id;

  1586.                     if (st->codecpar->format == AV_PIX_FMT_NONE) {

  1587.                         /* support files created before RP224v10 by defaulting to UYVY422

  1588.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1589.                         if (descriptor->horiz_subsampling == 2 &&

  1590.                             descriptor->vert_subsampling == 1 &&

  1591.                             descriptor->component_depth == 8) {

  1592.                             st->codecpar->format = AV_PIX_FMT_UYVY422;

  1593.                         }

  1594.                     }

  1595.                 }

  1596.             }

  1597.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1598.             if (material_track->sequence->origin) {

  1599.                 char material_origin[3];

  1600.                 snprintf(material_origin, sizeof(material_origin), "%d", material_track->sequence->origin);

  1601.                 av_dict_set(&st->metadata, "material_track_origin", material_origin, 0);

  1602.             }

  1603.             if (source_track->sequence->origin) {

  1604.                 char source_origin[3];

  1605.                 snprintf(source_origin, sizeof(source_origin), "%d", source_track->sequence->origin);

  1606.                 av_dict_set(&st->metadata, "source_track_origin", source_origin, 0);

  1607.             }

  1608.         } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {

  1609.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1610.             if (st->codecpar->codec_id == AV_CODEC_ID_NONE)

  1611.                 st->codecpar->codec_id = container_ul->id;

  1612.             st->codecpar->channels = descriptor->channels;

  1613.             st->codecpar->bits_per_coded_sample = descriptor->bits_per_sample;

  1614. 

  1615.             if (descriptor->sample_rate.den > 0) {

  1616.                 st->codecpar->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1617.                 avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);

  1618.             } else {

  1619.                 av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "

  1620.                        "found for stream #%d, time base forced to 1/48000\n",

  1621.                        descriptor->sample_rate.num, descriptor->sample_rate.den,

  1622.                        st->index);

  1623.                 avpriv_set_pts_info(st, 64, 1, 48000);

  1624.             }

  1625. 

  1626.             /* if duration is set, rescale it from EditRate to SampleRate */

  1627.             if (st->duration != AV_NOPTS_VALUE)

  1628.                 st->duration = av_rescale_q(st->duration,

  1629.                                             av_inv_q(material_track->edit_rate),

  1630.                                             st->time_base);

  1631. 

  1632.             /* TODO: implement AV_CODEC_ID_RAWAUDIO */

  1633.             if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {

  1634.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1635.                     st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;

  1636.                 else if (descriptor->bits_per_sample == 32)

  1637.                     st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;

  1638.             } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16BE) {

  1639.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1640.                     st->codecpar->codec_id = AV_CODEC_ID_PCM_S24BE;

  1641.                 else if (descriptor->bits_per_sample == 32)

  1642.                     st->codecpar->codec_id = AV_CODEC_ID_PCM_S32BE;

  1643.             } else if (st->codecpar->codec_id == AV_CODEC_ID_MP2) {

  1644.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1645.             }

  1646.         } else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA) {

  1647.             int codec_id = mxf_get_codec_ul(mxf_data_essence_container_uls,

  1648.                                             essence_container_ul)->id;

  1649.             if (codec_id >= 0 &&

  1650.                 codec_id < FF_ARRAY_ELEMS(mxf_data_essence_descriptor)) {

  1651.                 av_dict_set(&st->metadata, "data_type",

  1652.                             mxf_data_essence_descriptor[codec_id], 0);

  1653.             }

  1654.         }

  1655.         if (descriptor->extradata) {

  1656.             st->codecpar->extradata = av_mallocz(descriptor->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);

  1657.             if (st->codecpar->extradata) {

  1658.                 memcpy(st->codecpar->extradata, descriptor->extradata, descriptor->extradata_size);

  1659.                 st->codecpar->extradata_size = descriptor->extradata_size;

  1660.             }

  1661.         } else if (st->codecpar->codec_id == AV_CODEC_ID_H264) {

  1662.             ret = ff_generate_avci_extradata(st);

  1663.             if (ret < 0)

  1664.                 return ret;

  1665.         }

  1666.         if (st->codecpar->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1667.             /* TODO: decode timestamps */

  1668.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1669.         }

  1670.     }

  1671. 

  1672.     ret = 0;

  1673. fail_and_free:

  1674.     return ret;

  1675. }

  1676. 

  1677. static int mxf_read_utf16_string(AVIOContext *pb, int size, char** str)

  1678. {

  1679.     int ret;

  1680.     size_t buf_size;

  1681. 

  1682.     if (size < 0)

  1683.         return AVERROR(EINVAL);

  1684. 

  1685.     buf_size = size + size / 2 + 1;

  1686.     *str = av_malloc(buf_size);

  1687.     if (!*str)

  1688.         return AVERROR(ENOMEM);

  1689. 

  1690.     if ((ret = avio_get_str16be(pb, size, *str, buf_size)) < 0) {

  1691.         av_freep(str);

  1692.         return ret;

  1693.     }

  1694. 

  1695.     return ret;

  1696. }

  1697. 

  1698. static int mxf_uid_to_str(UID uid, char **str)

  1699. {

  1700.     int i;

  1701.     char *p;

  1702.     p = *str = av_mallocz(sizeof(UID) * 2 + 4 + 1);

  1703.     if (!p)

  1704.         return AVERROR(ENOMEM);

  1705.     for (i = 0; i < sizeof(UID); i++) {

  1706.         snprintf(p, 2 + 1, "%.2x", uid[i]);

  1707.         p += 2;

  1708.         if (i == 3 || i == 5 || i == 7 || i == 9) {

  1709.             snprintf(p, 1 + 1, "-");

  1710.             p++;

  1711.         }

  1712.     }

  1713.     return 0;

  1714. }

  1715. 

  1716. static int mxf_timestamp_to_str(uint64_t timestamp, char **str)

  1717. {

  1718.     struct tm time = { 0 };

  1719.     time.tm_year = (timestamp >> 48) - 1900;

  1720.     time.tm_mon  = (timestamp >> 40 & 0xFF) - 1;

  1721.     time.tm_mday = (timestamp >> 32 & 0xFF);

  1722.     time.tm_hour = (timestamp >> 24 & 0xFF);

  1723.     time.tm_min  = (timestamp >> 16 & 0xFF);

  1724.     time.tm_sec  = (timestamp >> 8  & 0xFF);

  1725. 

  1726.     /* msvcrt versions of strftime calls the invalid parameter handler

  1727.      * (aborting the process if one isn't set) if the parameters are out

  1728.      * of range. */

  1729.     time.tm_mon  = av_clip(time.tm_mon,  0, 11);

  1730.     time.tm_mday = av_clip(time.tm_mday, 1, 31);

  1731.     time.tm_hour = av_clip(time.tm_hour, 0, 23);

  1732.     time.tm_min  = av_clip(time.tm_min,  0, 59);

  1733.     time.tm_sec  = av_clip(time.tm_sec,  0, 59);

  1734. 

  1735.     *str = av_mallocz(32);

  1736.     if (!*str)

  1737.         return AVERROR(ENOMEM);

  1738.     if (!strftime(*str, 32, "%Y-%m-%d %H:%M:%S", &time))

  1739.         (*str)[0] = '\0';

  1740. 

  1741.     return 0;

  1742. }

  1743. 

  1744. #define SET_STR_METADATA(pb, name, str) do { \

  1745.     if ((ret = mxf_read_utf16_string(pb, size, &str)) < 0) \

  1746.         return ret; \

  1747.     av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \

  1748. } while (0)

  1749. 

  1750. #define SET_UID_METADATA(pb, name, var, str) do { \

  1751.     avio_read(pb, var, 16); \

  1752.     if ((ret = mxf_uid_to_str(var, &str)) < 0) \

  1753.         return ret; \

  1754.     av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \

  1755. } while (0)

  1756. 

  1757. #define SET_TS_METADATA(pb, name, var, str) do { \

  1758.     var = avio_rb64(pb); \

  1759.     if ((ret = mxf_timestamp_to_str(var, &str)) < 0) \

  1760.         return ret; \

  1761.     av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \

  1762. } while (0)

  1763. 

  1764. static int mxf_read_identification_metadata(void *arg, AVIOContext *pb, int tag, int size, UID _uid, int64_t klv_offset)

  1765. {

  1766.     MXFContext *mxf = arg;

  1767.     AVFormatContext *s = mxf->fc;

  1768.     int ret;

  1769.     UID uid = { 0 };

  1770.     char *str = NULL;

  1771.     uint64_t ts;

  1772.     switch (tag) {

  1773.     case 0x3C01:

  1774.         SET_STR_METADATA(pb, "company_name", str);

  1775.         break;

  1776.     case 0x3C02:

  1777.         SET_STR_METADATA(pb, "product_name", str);

  1778.         break;

  1779.     case 0x3C04:

  1780.         SET_STR_METADATA(pb, "product_version", str);

  1781.         break;

  1782.     case 0x3C05:

  1783.         SET_UID_METADATA(pb, "product_uid", uid, str);

  1784.         break;

  1785.     case 0x3C06:

  1786.         SET_TS_METADATA(pb, "modification_date", ts, str);

  1787.         break;

  1788.     case 0x3C08:

  1789.         SET_STR_METADATA(pb, "application_platform", str);

  1790.         break;

  1791.     case 0x3C09:

  1792.         SET_UID_METADATA(pb, "generation_uid", uid, str);

  1793.         break;

  1794.     case 0x3C0A:

  1795.         SET_UID_METADATA(pb, "uid", uid, str);

  1796.         break;

  1797.     }

  1798.     return 0;

  1799. }

  1800. 

  1801. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1802.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1803. //    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2f,0x00 }, mxf_read_preface_pack },

  1804.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1805.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1806.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1807.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1808.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1809.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1810.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1811.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1812.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1813.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1814.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x30,0x00 }, mxf_read_identification_metadata },

  1815.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1816.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1817.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1818.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1819.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1820.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1821.     { { 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 */

  1822.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1823.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1824.     { { 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 */

  1825.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1826.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1827.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG2VideoDescriptor */

  1828.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x5c,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* VANC/VBI - SMPTE 436M */

  1829.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x5e,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG2AudioDescriptor */

  1830.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1831.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1832.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1833.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1834.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1835. };

  1836. 

  1837. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1838. {

  1839.     AVIOContext *pb = mxf->fc->pb;

  1840.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1841.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1842. 

  1843.     if (!ctx)

  1844.         return AVERROR(ENOMEM);

  1845.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1846.         int ret;

  1847.         int tag = avio_rb16(pb);

  1848.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1849.         uint64_t next = avio_tell(pb) + size;

  1850.         UID uid = {0};

  1851. 

  1852.         av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x size %d\n", tag, size);

  1853.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1854.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1855.             continue;

  1856.         }

  1857.         if (tag > 0x7FFF) { /* dynamic tag */

  1858.             int i;

  1859.             for (i = 0; i < mxf->local_tags_count; i++) {

  1860.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1861.                 if (local_tag == tag) {

  1862.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1863.                     av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x\n", local_tag);

  1864.                     PRINT_KEY(mxf->fc, "uid", uid);

  1865.                 }

  1866.             }

  1867.         }

  1868.         if (ctx_size && tag == 0x3C0A)

  1869.             avio_read(pb, ctx->uid, 16);

  1870.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1871.             return ret;

  1872. 

  1873.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1874.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1875.         if (avio_tell(pb) > klv_end) {

  1876.             if (ctx_size)

  1877.                 av_free(ctx);

  1878. 

  1879.             av_log(mxf->fc, AV_LOG_ERROR,

  1880.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1881.                    tag, klv->offset);

  1882.             return AVERROR_INVALIDDATA;

  1883.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1884.             avio_seek(pb, next, SEEK_SET);

  1885.     }

  1886.     if (ctx_size) ctx->type = type;

  1887.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1888. }

  1889. 

  1890. /**

  1891.  * Seeks to the previous partition, if possible

  1892.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1893.  */

  1894. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1895. {

  1896.     AVIOContext *pb = mxf->fc->pb;

  1897. 

  1898.     if (!mxf->current_partition ||

  1899.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1900.         return 0;   /* we've parsed all partitions */

  1901. 

  1902.     /* seek to previous partition */

  1903.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1904.     mxf->current_partition = NULL;

  1905. 

  1906.     av_log(mxf->fc, AV_LOG_TRACE, "seeking to previous partition\n");

  1907. 

  1908.     return 1;

  1909. }

  1910. 

  1911. /**

  1912.  * Called when essence is encountered

  1913.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1914.  */

  1915. static int mxf_parse_handle_essence(MXFContext *mxf)

  1916. {

  1917.     AVIOContext *pb = mxf->fc->pb;

  1918.     int64_t ret;

  1919. 

  1920.     if (mxf->parsing_backward) {

  1921.         return mxf_seek_to_previous_partition(mxf);

  1922.     } else {

  1923.         uint64_t offset = mxf->footer_partition ? mxf->footer_partition

  1924.                                                 : mxf->last_partition;

  1925. 

  1926.         if (!offset) {

  1927.             av_log(mxf->fc, AV_LOG_TRACE, "no last partition\n");

  1928.             return 0;

  1929.         }

  1930. 

  1931.         av_log(mxf->fc, AV_LOG_TRACE, "seeking to last partition\n");

  1932. 

  1933.         /* remember where we were so we don't end up seeking further back than this */

  1934.         mxf->last_forward_tell = avio_tell(pb);

  1935. 

  1936.         if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {

  1937.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing last partition\n");

  1938.             return -1;

  1939.         }

  1940. 

  1941.         /* seek to last partition and parse backward */

  1942.         if ((ret = avio_seek(pb, mxf->run_in + offset, SEEK_SET)) < 0) {

  1943.             av_log(mxf->fc, AV_LOG_ERROR,

  1944.                    "failed to seek to last partition @ 0x%" PRIx64

  1945.                    " (%"PRId64") - partial file?\n",

  1946.                    mxf->run_in + offset, ret);

  1947.             return ret;

  1948.         }

  1949. 

  1950.         mxf->current_partition = NULL;

  1951.         mxf->parsing_backward = 1;

  1952.     }

  1953. 

  1954.     return 1;

  1955. }

  1956. 

  1957. /**

  1958.  * Called when the next partition or EOF is encountered

  1959.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1960.  */

  1961. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1962. {

  1963.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1964. }

  1965. 

  1966. /**

  1967.  * Figure out the proper offset and length of the essence container

  1968.  * in each partition

  1969.  */

  1970. static void mxf_compute_essence_containers(MXFContext *mxf)

  1971. {

  1972.     int x;

  1973. 

  1974.     /* everything is already correct */

  1975.     if (mxf->op == OPAtom)

  1976.         return;

  1977. 

  1978.     for (x = 0; x < mxf->partitions_count; x++) {

  1979.         MXFPartition *p = &mxf->partitions[x];

  1980. 

  1981.         if (!p->body_sid)

  1982.             continue;       /* BodySID == 0 -> no essence */

  1983. 

  1984.         if (x >= mxf->partitions_count - 1)

  1985.             break;          /* last partition - can't compute length (and we don't need to) */

  1986. 

  1987.         /* essence container spans to the next partition */

  1988.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1989. 

  1990.         if (p->essence_length < 0) {

  1991.             /* next ThisPartition < essence_offset */

  1992.             p->essence_length = 0;

  1993.             av_log(mxf->fc, AV_LOG_ERROR,

  1994.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1995.                    x+1, mxf->partitions[x+1].this_partition);

  1996.         }

  1997.     }

  1998. }

  1999. 

  2000. static int64_t round_to_kag(int64_t position, int kag_size)

  2001. {

  2002.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  2003.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  2004.     int64_t ret = (position / kag_size) * kag_size;

  2005.     return ret == position ? ret : ret + kag_size;

  2006. }

  2007. 

  2008. static inline void compute_partition_essence_offset(AVFormatContext *s,

  2009.                                                     MXFContext *mxf,

  2010.                                                     KLVPacket *klv)

  2011. {

  2012.     MXFPartition *cur_part = mxf->current_partition;

  2013.     /* for OP1a we compute essence_offset

  2014.      * for OPAtom we point essence_offset after the KL

  2015.      *     (usually op1a_essence_offset + 20 or 25)

  2016.      * TODO: for OP1a we could eliminate this entire if statement, always

  2017.      *       stopping parsing at op1a_essence_offset

  2018.      *       for OPAtom we still need the actual essence_offset though

  2019.      *       (the KL's length can vary)

  2020.      */

  2021.     int64_t op1a_essence_offset =

  2022.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  2023.                      cur_part->kag_size) +

  2024.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  2025.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  2026. 

  2027.     if (mxf->op == OPAtom) {

  2028.         /* point essence_offset to the actual data

  2029.          * OPAtom has all the essence in one big KLV

  2030.          */

  2031.         cur_part->essence_offset = avio_tell(s->pb);

  2032.         cur_part->essence_length = klv->length;

  2033.     } else {

  2034.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  2035.          * (C0023S01.mxf)  */

  2036.         cur_part->essence_offset = op1a_essence_offset;

  2037.     }

  2038. }

  2039. 

  2040. static int is_pcm(enum AVCodecID codec_id)

  2041. {

  2042.     /* we only care about "normal" PCM codecs until we get samples */

  2043.     return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;

  2044. }

  2045. 

  2046. /**

  2047.  * Deal with the case where for some audio atoms EditUnitByteCount is

  2048.  * very small (2, 4..). In those cases we should read more than one

  2049.  * sample per call to mxf_read_packet().

  2050.  */

  2051. static void mxf_handle_small_eubc(AVFormatContext *s)

  2052. {

  2053.     MXFContext *mxf = s->priv_data;

  2054. 

  2055.     /* assuming non-OPAtom == frame wrapped

  2056.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  2057.     if (mxf->op != OPAtom)

  2058.         return;

  2059. 

  2060.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  2061.     if (s->nb_streams != 1                                     ||

  2062.         s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO ||

  2063.         !is_pcm(s->streams[0]->codecpar->codec_id)                ||

  2064.         mxf->nb_index_tables != 1                              ||

  2065.         mxf->index_tables[0].nb_segments != 1                  ||

  2066.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  2067.         return;

  2068. 

  2069.     /* arbitrarily default to 48 kHz PAL audio frame size */

  2070.     /* TODO: We could compute this from the ratio between the audio

  2071.      *       and video edit rates for 48 kHz NTSC we could use the

  2072.      *       1802-1802-1802-1802-1801 pattern. */

  2073.     mxf->edit_units_per_packet = 1920;

  2074. }

  2075. 

  2076. static void mxf_read_random_index_pack(AVFormatContext *s)

  2077. {

  2078.     MXFContext *mxf = s->priv_data;

  2079.     uint32_t length;

  2080.     int64_t file_size;

  2081.     KLVPacket klv;

  2082. 

  2083.     if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))

  2084.         return;

  2085. 

  2086.     file_size = avio_size(s->pb);

  2087.     avio_seek(s->pb, file_size - 4, SEEK_SET);

  2088.     length = avio_rb32(s->pb);

  2089.     if (length <= 32 || length >= FFMIN(file_size, INT_MAX))

  2090.         goto end;

  2091.     avio_seek(s->pb, file_size - length, SEEK_SET);

  2092.     if (klv_read_packet(&klv, s->pb) < 0 ||

  2093.         !IS_KLV_KEY(klv.key, mxf_random_index_pack_key) ||

  2094.         klv.length != length - 20)

  2095.         goto end;

  2096. 

  2097.     avio_skip(s->pb, klv.length - 12);

  2098.     mxf->last_partition = avio_rb64(s->pb);

  2099. 

  2100. end:

  2101.     avio_seek(s->pb, mxf->run_in, SEEK_SET);

  2102. }

  2103. 

  2104. static int mxf_read_header(AVFormatContext *s)

  2105. {

  2106.     MXFContext *mxf = s->priv_data;

  2107.     KLVPacket klv;

  2108.     int64_t essence_offset = 0;

  2109.     int ret;

  2110. 

  2111.     mxf->last_forward_tell = INT64_MAX;

  2112.     mxf->edit_units_per_packet = 1;

  2113. 

  2114.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  2115.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  2116.         return AVERROR_INVALIDDATA;

  2117.     }

  2118.     avio_seek(s->pb, -14, SEEK_CUR);

  2119.     mxf->fc = s;

  2120.     mxf->run_in = avio_tell(s->pb);

  2121. 

  2122.     mxf_read_random_index_pack(s);

  2123. 

  2124.     while (!s->pb->eof_reached) {

  2125. 

  2126.         const MXFMetadataReadTableEntry *metadata;

  2127. 

  2128.         if (klv_read_packet(&klv, s->pb) < 0) {

  2129.             /* EOF - seek to previous partition or stop */

  2130.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  2131.                 break;

  2132.             else

  2133.                 continue;

  2134.         }

  2135. 

  2136.         PRINT_KEY(s, "read header", klv.key);

  2137.         av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2138.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  2139.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2140.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  2141.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  2142. 

  2143.             if (!mxf->current_partition) {

  2144.                 av_log(mxf->fc, AV_LOG_ERROR,

  2145.                        "found essence prior to first PartitionPack\n");

  2146.                 return AVERROR_INVALIDDATA;

  2147.             }

  2148. 

  2149.             if (!mxf->current_partition->essence_offset) {

  2150.                 compute_partition_essence_offset(s, mxf, &klv);

  2151.             }

  2152. 

  2153.             if (!essence_offset)

  2154.                 essence_offset = klv.offset;

  2155. 

  2156.             /* seek to footer, previous partition or stop */

  2157.             if (mxf_parse_handle_essence(mxf) <= 0)

  2158.                 break;

  2159.             continue;

  2160.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  2161.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  2162.             /* next partition pack - keep going, seek to previous partition or stop */

  2163.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  2164.                 break;

  2165.             else if (mxf->parsing_backward)

  2166.                 continue;

  2167.             /* we're still parsing forward. proceed to parsing this partition pack */

  2168.         }

  2169. 

  2170.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  2171.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  2172.                 int res;

  2173.                 if (klv.key[5] == 0x53) {

  2174.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  2175.                 } else {

  2176.                     uint64_t next = avio_tell(s->pb) + klv.length;

  2177.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  2178. 

  2179.                     /* only seek forward, else this can loop for a long time */

  2180.                     if (avio_tell(s->pb) > next) {

  2181.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  2182.                                klv.offset);

  2183.                         return AVERROR_INVALIDDATA;

  2184.                     }

  2185. 

  2186.                     avio_seek(s->pb, next, SEEK_SET);

  2187.                 }

  2188.                 if (res < 0) {

  2189.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  2190.                     return res;

  2191.                 }

  2192.                 break;

  2193.             } else {

  2194.                 av_log(s, AV_LOG_VERBOSE, "Dark key " PRIxUID "\n",

  2195.                        UID_ARG(klv.key));

  2196.             }

  2197.         }

  2198.         if (!metadata->read)

  2199.             avio_skip(s->pb, klv.length);

  2200.     }

  2201.     /* FIXME avoid seek */

  2202.     if (!essence_offset)  {

  2203.         av_log(s, AV_LOG_ERROR, "no essence\n");

  2204.         return AVERROR_INVALIDDATA;

  2205.     }

  2206.     avio_seek(s->pb, essence_offset, SEEK_SET);

  2207. 

  2208.     mxf_compute_essence_containers(mxf);

  2209. 

  2210.     /* we need to do this before computing the index tables

  2211.      * to be able to fill in zero IndexDurations with st->duration */

  2212.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  2213.         return ret;

  2214. 

  2215.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  2216.         return ret;

  2217. 

  2218.     if (mxf->nb_index_tables > 1) {

  2219.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  2220.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  2221.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  2222.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  2223.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  2224.         return AVERROR_INVALIDDATA;

  2225.     }

  2226. 

  2227.     mxf_handle_small_eubc(s);

  2228. 

  2229.     return 0;

  2230. }

  2231. 

  2232. /**

  2233.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  2234.  * @return next_ofs if OK, <0 on error

  2235.  */

  2236. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  2237. {

  2238.     int64_t last_ofs = -1, next_ofs = -1;

  2239.     MXFIndexTable *t = &mxf->index_tables[0];

  2240. 

  2241.     /* this is called from the OP1a demuxing logic, which means there

  2242.      * may be no index tables */

  2243.     if (mxf->nb_index_tables <= 0)

  2244.         return -1;

  2245. 

  2246.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  2247.      * of current_offset */

  2248.     while (mxf->current_edit_unit >= 0) {

  2249.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  2250.                                           NULL, &next_ofs, 0) < 0)

  2251.             return -1;

  2252. 

  2253.         if (next_ofs <= last_ofs) {

  2254.             /* large next_ofs didn't change or current_edit_unit wrapped

  2255.              * around this fixes the infinite loop on zzuf3.mxf */

  2256.             av_log(mxf->fc, AV_LOG_ERROR,

  2257.                    "next_ofs didn't change. not deriving packet timestamps\n");

  2258.             return -1;

  2259.         }

  2260. 

  2261.         if (next_ofs > current_offset)

  2262.             break;

  2263. 

  2264.         last_ofs = next_ofs;

  2265.         mxf->current_edit_unit++;

  2266.     }

  2267. 

  2268.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  2269.      * may lack IndexEntryArrays */

  2270.     if (mxf->current_edit_unit < 0)

  2271.         return -1;

  2272. 

  2273.     return next_ofs;

  2274. }

  2275. 

  2276. static int mxf_compute_sample_count(MXFContext *mxf, int stream_index,

  2277.                                     uint64_t *sample_count)

  2278. {

  2279.     int i, total = 0, size = 0;

  2280.     AVStream *st = mxf->fc->streams[stream_index];

  2281.     MXFTrack *track = st->priv_data;

  2282.     AVRational time_base = av_inv_q(track->edit_rate);

  2283.     AVRational sample_rate = av_inv_q(st->time_base);

  2284.     const MXFSamplesPerFrame *spf = NULL;

  2285. 

  2286.     if ((sample_rate.num / sample_rate.den) == 48000)

  2287.         spf = ff_mxf_get_samples_per_frame(mxf->fc, time_base);

  2288.     if (!spf) {

  2289.         int remainder = (sample_rate.num * time_base.num) %

  2290.                         (time_base.den * sample_rate.den);

  2291.         *sample_count = av_q2d(av_mul_q((AVRational){mxf->current_edit_unit, 1},

  2292.                                         av_mul_q(sample_rate, time_base)));

  2293.         if (remainder)

  2294.             av_log(mxf->fc, AV_LOG_WARNING,

  2295.                    "seeking detected on stream #%d with time base (%d/%d) and "

  2296.                    "sample rate (%d/%d), audio pts won't be accurate.\n",

  2297.                    stream_index, time_base.num, time_base.den,

  2298.                    sample_rate.num, sample_rate.den);

  2299.         return 0;

  2300.     }

  2301. 

  2302.     while (spf->samples_per_frame[size]) {

  2303.         total += spf->samples_per_frame[size];

  2304.         size++;

  2305.     }

  2306. 

  2307.     if (!size)

  2308.         return 0;

  2309. 

  2310.     *sample_count = (mxf->current_edit_unit / size) * (uint64_t)total;

  2311.     for (i = 0; i < mxf->current_edit_unit % size; i++) {

  2312.         *sample_count += spf->samples_per_frame[i];

  2313.     }

  2314. 

  2315.     return 0;

  2316. }

  2317. 

  2318. static int mxf_set_audio_pts(MXFContext *mxf, AVCodecParameters *par,

  2319.                              AVPacket *pkt)

  2320. {

  2321.     MXFTrack *track = mxf->fc->streams[pkt->stream_index]->priv_data;

  2322.     int64_t bits_per_sample = par->bits_per_coded_sample;

  2323. 

  2324.     if (!bits_per_sample)

  2325.         bits_per_sample = av_get_bits_per_sample(par->codec_id);

  2326. 

  2327.     pkt->pts = track->sample_count;

  2328. 

  2329.     if (par->channels <= 0 || par->channels * bits_per_sample < 8)

  2330.         return AVERROR_INVALIDDATA;

  2331. 

  2332.     track->sample_count += pkt->size / (par->channels * bits_per_sample / 8);

  2333.     return 0;

  2334. }

  2335. 

  2336. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  2337. {

  2338.     KLVPacket klv;

  2339.     MXFContext *mxf = s->priv_data;

  2340.     int ret;

  2341. 

  2342.     while (!s->pb->eof_reached) {

  2343.         if ((ret = klv_read_packet(&klv, s->pb)) < 0)

  2344.             return ret;

  2345.         PRINT_KEY(s, "read packet", klv.key);

  2346.         av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2347.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  2348.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  2349.             if (ret < 0) {

  2350.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  2351.                 return ret;

  2352.             }

  2353.             return 0;

  2354.         }

  2355.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2356.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2357.             int index = mxf_get_stream_index(s, &klv);

  2358.             int64_t next_ofs, next_klv;

  2359.             AVStream *st;

  2360.             MXFTrack *track;

  2361.             AVCodecParameters *par;

  2362. 

  2363.             if (index < 0) {

  2364.                 av_log(s, AV_LOG_ERROR,

  2365.                        "error getting stream index %"PRIu32"\n",

  2366.                        AV_RB32(klv.key + 12));

  2367.                 goto skip;

  2368.             }

  2369. 

  2370.             st = s->streams[index];

  2371.             track = st->priv_data;

  2372. 

  2373.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2374.                 goto skip;

  2375. 

  2376.             next_klv = avio_tell(s->pb) + klv.length;

  2377.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2378. 

  2379.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2380.                 /* if this check is hit then it's possible OPAtom was treated

  2381.                  * as OP1a truncate the packet since it's probably very large

  2382.                  * (>2 GiB is common) */

  2383.                 avpriv_request_sample(s,

  2384.                                       "OPAtom misinterpreted as OP1a?"

  2385.                                       "KLV for edit unit %i extending into "

  2386.                                       "next edit unit",

  2387.                                       mxf->current_edit_unit);

  2388.                 klv.length = next_ofs - avio_tell(s->pb);

  2389.             }

  2390. 

  2391.             /* check for 8 channels AES3 element */

  2392.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2393.                 ret = mxf_get_d10_aes3_packet(s->pb, s->streams[index],

  2394.                                               pkt, klv.length);

  2395.                 if (ret < 0) {

  2396.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2397.                     return ret;

  2398.                 }

  2399.             } else {

  2400.                 ret = av_get_packet(s->pb, pkt, klv.length);

  2401.                 if (ret < 0)

  2402.                     return ret;

  2403.             }

  2404.             pkt->stream_index = index;

  2405.             pkt->pos = klv.offset;

  2406. 

  2407.             par = s->streams[index]->codecpar;

  2408. 

  2409.             if (par->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2410.                 /* mxf->current_edit_unit good - see if we have an

  2411.                  * index table to derive timestamps from */

  2412.                 MXFIndexTable *t = &mxf->index_tables[0];

  2413. 

  2414.                 if (mxf->nb_index_tables >= 1 &&

  2415.                     mxf->current_edit_unit < t->nb_ptses) {

  2416.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2417.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2418.                 } else if (track->intra_only) {

  2419.                     /* intra-only -> PTS = EditUnit.

  2420.                      * let utils.c figure out DTS since it can be

  2421.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2422.                     pkt->pts = mxf->current_edit_unit;

  2423.                 }

  2424.             } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {

  2425.                 ret = mxf_set_audio_pts(mxf, par, pkt);

  2426.                 if (ret < 0)

  2427.                     return ret;

  2428.             }

  2429. 

  2430.             /* seek for truncated packets */

  2431.             avio_seek(s->pb, next_klv, SEEK_SET);

  2432. 

  2433.             return 0;

  2434.         } else

  2435.         skip:

  2436.             avio_skip(s->pb, klv.length);

  2437.     }

  2438.     return AVERROR_EOF;

  2439. }

  2440. 

  2441. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2442. {

  2443.     MXFContext *mxf = s->priv_data;

  2444.     int ret, size;

  2445.     int64_t ret64, pos, next_pos;

  2446.     AVStream *st;

  2447.     MXFIndexTable *t;

  2448.     int edit_units;

  2449. 

  2450.     if (mxf->op != OPAtom)

  2451.         return mxf_read_packet_old(s, pkt);

  2452. 

  2453.     /* OPAtom - clip wrapped demuxing */

  2454.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2455.     st = s->streams[0];

  2456.     t = &mxf->index_tables[0];

  2457. 

  2458.     if (mxf->current_edit_unit >= st->duration)

  2459.         return AVERROR_EOF;

  2460. 

  2461.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2462. 

  2463.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2464.         return ret;

  2465. 

  2466.     /* compute size by finding the next edit unit or the end of the essence container

  2467.      * not pretty, but it works */

  2468.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2469.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2470.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2471.         return AVERROR_INVALIDDATA;

  2472.     }

  2473. 

  2474.     if ((size = next_pos - pos) <= 0) {

  2475.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2476.         return AVERROR_INVALIDDATA;

  2477.     }

  2478. 

  2479.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2480.         return ret64;

  2481. 

  2482.     if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2483.         return ret < 0 ? ret : AVERROR_EOF;

  2484. 

  2485.     pkt->stream_index = 0;

  2486. 

  2487.     if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2488.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2489.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2490.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2491.     } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {

  2492.         int ret = mxf_set_audio_pts(mxf, st->codecpar, pkt);

  2493.         if (ret < 0)

  2494.             return ret;

  2495.     }

  2496. 

  2497.     mxf->current_edit_unit += edit_units;

  2498. 

  2499.     return 0;

  2500. }

  2501. 

  2502. 

  2503. static int mxf_read_close(AVFormatContext *s)

  2504. {

  2505.     MXFContext *mxf = s->priv_data;

  2506.     MXFIndexTableSegment *seg;

  2507.     int i;

  2508. 

  2509.     av_freep(&mxf->packages_refs);

  2510. 

  2511.     for (i = 0; i < s->nb_streams; i++)

  2512.         s->streams[i]->priv_data = NULL;

  2513. 

  2514.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2515.         switch (mxf->metadata_sets[i]->type) {

  2516.         case Descriptor:

  2517.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->extradata);

  2518.             break;

  2519.         case MultipleDescriptor:

  2520.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2521.             break;

  2522.         case Sequence:

  2523.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2524.             break;

  2525.         case SourcePackage:

  2526.         case MaterialPackage:

  2527.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2528.             break;

  2529.         case IndexTableSegment:

  2530.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2531.             av_freep(&seg->temporal_offset_entries);

  2532.             av_freep(&seg->flag_entries);

  2533.             av_freep(&seg->stream_offset_entries);

  2534.             break;

  2535.         default:

  2536.             break;

  2537.         }

  2538.         av_freep(&mxf->metadata_sets[i]);

  2539.     }

  2540.     av_freep(&mxf->partitions);

  2541.     av_freep(&mxf->metadata_sets);

  2542.     av_freep(&mxf->aesc);

  2543.     av_freep(&mxf->local_tags);

  2544. 

  2545.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2546.         av_freep(&mxf->index_tables[i].segments);

  2547.         av_freep(&mxf->index_tables[i].ptses);

  2548.         av_freep(&mxf->index_tables[i].fake_index);

  2549.     }

  2550.     av_freep(&mxf->index_tables);

  2551. 

  2552.     return 0;

  2553. }

  2554. 

  2555. static int mxf_probe(AVProbeData *p) {

  2556.     uint8_t *bufp = p->buf;

  2557.     uint8_t *end = p->buf + p->buf_size;

  2558. 

  2559.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2560.         return 0;

  2561. 

  2562.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2563.     end -= sizeof(mxf_header_partition_pack_key);

  2564.     for (; bufp < end; bufp++) {

  2565.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2566.             return AVPROBE_SCORE_MAX;

  2567.     }

  2568.     return 0;

  2569. }

  2570. 

  2571. /* rudimentary byte seek */

  2572. /* XXX: use MXF Index */

  2573. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2574. {

  2575.     AVStream *st = s->streams[stream_index];

  2576.     int64_t seconds;

  2577.     MXFContext* mxf = s->priv_data;

  2578.     int64_t seekpos;

  2579.     int i, ret;

  2580.     MXFIndexTable *t;

  2581.     MXFTrack *source_track = st->priv_data;

  2582. 

  2583.     /* if audio then truncate sample_time to EditRate */

  2584.     if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)

  2585.         sample_time = av_rescale_q(sample_time, st->time_base,

  2586.                                    av_inv_q(source_track->edit_rate));

  2587. 

  2588.     if (mxf->nb_index_tables <= 0) {

  2589.     if (!s->bit_rate)

  2590.         return AVERROR_INVALIDDATA;

  2591.     if (sample_time < 0)

  2592.         sample_time = 0;

  2593.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2594. 

  2595.     seekpos = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  2596.     if (seekpos < 0)

  2597.         return seekpos;

  2598. 

  2599.     ff_update_cur_dts(s, st, sample_time);

  2600.     mxf->current_edit_unit = sample_time;

  2601.     } else {

  2602.         t = &mxf->index_tables[0];

  2603. 

  2604.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2605.          * this also means we allow seeking before the start */

  2606.         sample_time = FFMAX(sample_time, 0);

  2607. 

  2608.         if (t->fake_index) {

  2609.             /* behave as if we have a proper index */

  2610.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2611.                 return sample_time;

  2612.         } else {

  2613.             /* no IndexEntryArray (one or more CBR segments)

  2614.              * make sure we don't seek past the end */

  2615.             sample_time = FFMIN(sample_time, source_track->original_duration - 1);

  2616.         }

  2617. 

  2618.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2619.             return ret;

  2620. 

  2621.         ff_update_cur_dts(s, st, sample_time);

  2622.         mxf->current_edit_unit = sample_time;

  2623.         avio_seek(s->pb, seekpos, SEEK_SET);

  2624.     }

  2625. 

  2626.     // Update all tracks sample count

  2627.     for (i = 0; i < s->nb_streams; i++) {

  2628.         AVStream *cur_st = s->streams[i];

  2629.         MXFTrack *cur_track = cur_st->priv_data;

  2630.         uint64_t current_sample_count = 0;

  2631.         if (cur_st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {

  2632.             ret = mxf_compute_sample_count(mxf, i, &current_sample_count);

  2633.             if (ret < 0)

  2634.                 return ret;

  2635. 

  2636.             cur_track->sample_count = current_sample_count;

  2637.         }

  2638.     }

  2639.     return 0;

  2640. }

  2641. 

  2642. AVInputFormat ff_mxf_demuxer = {

  2643.     .name           = "mxf",

  2644.     .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

  2645.     .priv_data_size = sizeof(MXFContext),

  2646.     .read_probe     = mxf_probe,

  2647.     .read_header    = mxf_read_header,

  2648.     .read_packet    = mxf_read_packet,

  2649.     .read_close     = mxf_read_close,

  2650.     .read_seek      = mxf_read_seek,

  2651. };