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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

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

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124.     int intra_only;

  125. } MXFTrack;

  126. 

  127. typedef struct {

  128.     UID uid;

  129.     enum MXFMetadataSetType type;

  130.     UID essence_container_ul;

  131.     UID essence_codec_ul;

  132.     AVRational sample_rate;

  133.     AVRational aspect_ratio;

  134.     int width;

  135.     int height;

  136.     int channels;

  137.     int bits_per_sample;

  138.     unsigned int component_depth;

  139.     unsigned int horiz_subsampling;

  140.     unsigned int vert_subsampling;

  141.     UID *sub_descriptors_refs;

  142.     int sub_descriptors_count;

  143.     int linked_track_id;

  144.     uint8_t *extradata;

  145.     int extradata_size;

  146.     enum PixelFormat pix_fmt;

  147. } MXFDescriptor;

  148. 

  149. typedef struct {

  150.     UID uid;

  151.     enum MXFMetadataSetType type;

  152.     int edit_unit_byte_count;

  153.     int index_sid;

  154.     int body_sid;

  155.     AVRational index_edit_rate;

  156.     uint64_t index_start_position;

  157.     uint64_t index_duration;

  158.     int8_t *temporal_offset_entries;

  159.     int *flag_entries;

  160.     uint64_t *stream_offset_entries;

  161.     int nb_index_entries;

  162. } MXFIndexTableSegment;

  163. 

  164. typedef struct {

  165.     UID uid;

  166.     enum MXFMetadataSetType type;

  167.     UID package_uid;

  168.     UID *tracks_refs;

  169.     int tracks_count;

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

  171.     UID descriptor_ref;

  172. } MXFPackage;

  173. 

  174. typedef struct {

  175.     UID uid;

  176.     enum MXFMetadataSetType type;

  177. } MXFMetadataSet;

  178. 

  179. /* decoded index table */

  180. typedef struct {

  181.     int index_sid;

  182.     int body_sid;

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

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

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

  186.     int nb_segments;

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

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

  189. } MXFIndexTable;

  190. 

  191. typedef struct {

  192.     MXFPartition *partitions;

  193.     unsigned partitions_count;

  194.     MXFOP op;

  195.     UID *packages_refs;

  196.     int packages_count;

  197.     MXFMetadataSet **metadata_sets;

  198.     int metadata_sets_count;

  199.     AVFormatContext *fc;

  200.     struct AVAES *aesc;

  201.     uint8_t *local_tags;

  202.     int local_tags_count;

  203.     uint64_t footer_partition;

  204.     KLVPacket current_klv_data;

  205.     int current_klv_index;

  206.     int run_in;

  207.     MXFPartition *current_partition;

  208.     int parsing_backward;

  209.     int64_t last_forward_tell;

  210.     int last_forward_partition;

  211.     int current_edit_unit;

  212.     int nb_index_tables;

  213.     MXFIndexTable *index_tables;

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

  215. } MXFContext;

  216. 

  217. enum MXFWrappingScheme {

  218.     Frame,

  219.     Clip,

  220. };

  221. 

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

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

  224. 

  225. typedef struct {

  226.     const UID key;

  227.     MXFMetadataReadFunc *read;

  228.     int ctx_size;

  229.     enum MXFMetadataSetType type;

  230. } MXFMetadataReadTableEntry;

  231. 

  232. /* partial keys to match */

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

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

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

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

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

  238. /* complete keys to match */

  239. 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 };

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

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

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

  243. 

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

  245. 

  246. static int64_t klv_decode_ber_length(AVIOContext *pb)

  247. {

  248.     uint64_t size = avio_r8(pb);

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

  250.         int bytes_num = size & 0x7f;

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

  252.         if (bytes_num > 8)

  253.             return AVERROR_INVALIDDATA;

  254.         size = 0;

  255.         while (bytes_num--)

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

  257.     }

  258.     return size;

  259. }

  260. 

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

  262. {

  263.     int i, b;

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

  265.         b = avio_r8(pb);

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

  267.             i = 0;

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

  269.             i = -1;

  270.     }

  271.     return i == size;

  272. }

  273. 

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

  275. {

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

  277.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  283. }

  284. 

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

  286. {

  287.     int i;

  288. 

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

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

  291.         /* SMPTE 379M 7.3 */

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

  293.             return i;

  294.     }

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

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

  297. }

  298. 

  299. /* XXX: use AVBitStreamFilter */

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

  301. {

  302.     const uint8_t *buf_ptr, *end_ptr;

  303.     uint8_t *data_ptr;

  304.     int i;

  305. 

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

  307.         return AVERROR_INVALIDDATA;

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

  309.     if (length < 0)

  310.         return length;

  311.     data_ptr = pkt->data;

  312.     end_ptr = pkt->data + length;

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

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

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

  316.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  319.             else

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

  321.         }

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

  323.     }

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

  325.     return 0;

  326. }

  327. 

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

  329. {

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

  331.     MXFContext *mxf = s->priv_data;

  332.     AVIOContext *pb = s->pb;

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

  334.     int64_t size;

  335.     uint64_t orig_size;

  336.     uint64_t plaintext_size;

  337.     uint8_t ivec[16];

  338.     uint8_t tmpbuf[16];

  339.     int index;

  340. 

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

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

  343.         if (!mxf->aesc)

  344.             return AVERROR(ENOMEM);

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

  346.     }

  347.     // crypto context

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

  349.     // plaintext offset

  350.     klv_decode_ber_length(pb);

  351.     plaintext_size = avio_rb64(pb);

  352.     // source klv key

  353.     klv_decode_ber_length(pb);

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

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

  356.         return AVERROR_INVALIDDATA;

  357.     index = mxf_get_stream_index(s, klv);

  358.     if (index < 0)

  359.         return AVERROR_INVALIDDATA;

  360.     // source size

  361.     klv_decode_ber_length(pb);

  362.     orig_size = avio_rb64(pb);

  363.     if (orig_size < plaintext_size)

  364.         return AVERROR_INVALIDDATA;

  365.     // enc. code

  366.     size = klv_decode_ber_length(pb);

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

  368.         return AVERROR_INVALIDDATA;

  369.     avio_read(pb, ivec, 16);

  370.     avio_read(pb, tmpbuf, 16);

  371.     if (mxf->aesc)

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

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

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

  375.     size -= 32;

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

  377.     if (size < 0)

  378.         return size;

  379.     else if (size < plaintext_size)

  380.         return AVERROR_INVALIDDATA;

  381.     size -= plaintext_size;

  382.     if (mxf->aesc)

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

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

  385.     av_shrink_packet(pkt, orig_size);

  386.     pkt->stream_index = index;

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

  388.     return 0;

  389. }

  390. 

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

  392. {

  393.     MXFContext *mxf = arg;

  394.     int item_num = avio_rb32(pb);

  395.     int item_len = avio_rb32(pb);

  396. 

  397.     if (item_len != 18) {

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

  399.                               item_len);

  400.         return AVERROR_PATCHWELCOME;

  401.     }

  402.     if (item_num > UINT_MAX / item_len)

  403.         return AVERROR_INVALIDDATA;

  404.     mxf->local_tags_count = item_num;

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

  406.     if (!mxf->local_tags)

  407.         return AVERROR(ENOMEM);

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

  409.     return 0;

  410. }

  411. 

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

  413. {

  414.     MXFContext *mxf = arg;

  415.     MXFPartition *partition, *tmp_part;

  416.     UID op;

  417.     uint64_t footer_partition;

  418.     uint32_t nb_essence_containers;

  419. 

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

  421.         return AVERROR(ENOMEM);

  422. 

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

  424.     if (!tmp_part)

  425.         return AVERROR(ENOMEM);

  426.     mxf->partitions = tmp_part;

  427. 

  428.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  435.     } else {

  436.         mxf->last_forward_partition++;

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

  438.     }

  439. 

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

  441.     mxf->partitions_count++;

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

  443. 

  444.     switch(uid[13]) {

  445.     case 2:

  446.         partition->type = Header;

  447.         break;

  448.     case 3:

  449.         partition->type = BodyPartition;

  450.         break;

  451.     case 4:

  452.         partition->type = Footer;

  453.         break;

  454.     default:

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

  456.         return AVERROR_INVALIDDATA;

  457.     }

  458. 

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

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

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

  462.     avio_skip(pb, 4);

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

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

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

  466.     footer_partition = avio_rb64(pb);

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

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

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

  470.     avio_skip(pb, 8);

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

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

  473.     nb_essence_containers = avio_rb32(pb);

  474. 

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

  476.     if (footer_partition) {

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

  478.             av_log(mxf->fc, AV_LOG_ERROR,

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

  480.                    mxf->footer_partition, footer_partition);

  481.         } else {

  482.             mxf->footer_partition = footer_partition;

  483.         }

  484.     }

  485. 

  486.     av_dlog(mxf->fc,

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

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

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

  490.             partition->this_partition,

  491.             partition->previous_partition, footer_partition,

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

  493. 

  494.     /* sanity check PreviousPartition if set */

  495.     if (partition->previous_partition &&

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

  497.         av_log(mxf->fc, AV_LOG_ERROR,

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

  499.         return AVERROR_INVALIDDATA;

  500.     }

  501. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  515.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  517.         if (nb_essence_containers != 1) {

  518.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  519. 

  520.             /* only nag once */

  521.             if (!mxf->op)

  522.                 av_log(mxf->fc, AV_LOG_WARNING, "\"OPAtom\" with %u ECs - assuming %s\n",

  523.                        nb_essence_containers, op == OP1a ? "OP1a" : "OPAtom");

  524. 

  525.             mxf->op = op;

  526.         } else

  527.             mxf->op = OPAtom;

  528.     } else {

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

  530.         mxf->op = OP1a;

  531.     }

  532. 

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

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

  535. 

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

  537.             partition->kag_size = 512;

  538.         else

  539.             partition->kag_size = 1;

  540. 

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

  542.     }

  543. 

  544.     return 0;

  545. }

  546. 

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

  548. {

  549.     MXFMetadataSet **tmp;

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

  551.         return AVERROR(ENOMEM);

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

  553.     if (!tmp)

  554.         return AVERROR(ENOMEM);

  555.     mxf->metadata_sets = tmp;

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

  557.     mxf->metadata_sets_count++;

  558.     return 0;

  559. }

  560. 

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

  562. {

  563.     MXFCryptoContext *cryptocontext = arg;

  564.     if (size != 16)

  565.         return AVERROR_INVALIDDATA;

  566.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  568.     return 0;

  569. }

  570. 

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

  572. {

  573.     MXFContext *mxf = arg;

  574.     switch (tag) {

  575.     case 0x1901:

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

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

  578.             return AVERROR_INVALIDDATA;

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

  580.         if (!mxf->packages_refs)

  581.             return AVERROR(ENOMEM);

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

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

  584.         break;

  585.     }

  586.     return 0;

  587. }

  588. 

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

  590. {

  591.     MXFStructuralComponent *source_clip = arg;

  592.     switch(tag) {

  593.     case 0x0202:

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

  595.         break;

  596.     case 0x1201:

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

  598.         break;

  599.     case 0x1101:

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

  601.         avio_skip(pb, 16);

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

  603.         break;

  604.     case 0x1102:

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

  606.         break;

  607.     }

  608.     return 0;

  609. }

  610. 

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

  612. {

  613.     MXFPackage *package = arg;

  614.     switch(tag) {

  615.     case 0x4403:

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

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

  618.             return AVERROR_INVALIDDATA;

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

  620.         if (!package->tracks_refs)

  621.             return AVERROR(ENOMEM);

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

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

  624.         break;

  625.     }

  626.     return 0;

  627. }

  628. 

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

  630. {

  631.     MXFTrack *track = arg;

  632.     switch(tag) {

  633.     case 0x4801:

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

  635.         break;

  636.     case 0x4804:

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

  638.         break;

  639.     case 0x4B01:

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

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

  642.         break;

  643.     case 0x4803:

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

  645.         break;

  646.     }

  647.     return 0;

  648. }

  649. 

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

  651. {

  652.     MXFSequence *sequence = arg;

  653.     switch(tag) {

  654.     case 0x0202:

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

  656.         break;

  657.     case 0x0201:

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

  659.         break;

  660.     case 0x1001:

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

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

  663.             return AVERROR_INVALIDDATA;

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

  665.         if (!sequence->structural_components_refs)

  666.             return AVERROR(ENOMEM);

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

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

  669.         break;

  670.     }

  671.     return 0;

  672. }

  673. 

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

  675. {

  676.     MXFPackage *package = arg;

  677.     switch(tag) {

  678.     case 0x4403:

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

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

  681.             return AVERROR_INVALIDDATA;

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

  683.         if (!package->tracks_refs)

  684.             return AVERROR(ENOMEM);

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

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

  687.         break;

  688.     case 0x4401:

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

  690.         avio_skip(pb, 16);

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

  692.         break;

  693.     case 0x4701:

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

  695.         break;

  696.     }

  697.     return 0;

  698. }

  699. 

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

  701. {

  702.     int i, length;

  703. 

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

  705.     length = avio_rb32(pb);

  706. 

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

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

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

  710.         return AVERROR(ENOMEM);

  711. 

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

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

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

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

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

  717.         avio_skip(pb, length - 11);

  718.     }

  719.     return 0;

  720. }

  721. 

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

  723. {

  724.     MXFIndexTableSegment *segment = arg;

  725.     switch(tag) {

  726.     case 0x3F05:

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

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

  729.         break;

  730.     case 0x3F06:

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

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

  733.         break;

  734.     case 0x3F07:

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

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

  737.         break;

  738.     case 0x3F0A:

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

  740.         return mxf_read_index_entry_array(pb, segment);

  741.     case 0x3F0B:

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

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

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

  745.                 segment->index_edit_rate.den);

  746.         break;

  747.     case 0x3F0C:

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

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

  750.         break;

  751.     case 0x3F0D:

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

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

  754.         break;

  755.     }

  756.     return 0;

  757. }

  758. 

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

  760. {

  761.     int code, value, ofs = 0;

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

  763. 

  764.     do {

  765.         code = avio_r8(pb);

  766.         value = avio_r8(pb);

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

  768. 

  769.         if (ofs < 16) {

  770.             layout[ofs++] = code;

  771.             layout[ofs++] = value;

  772.         }

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

  774. 

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

  776. }

  777. 

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

  779. {

  780.     MXFDescriptor *descriptor = arg;

  781.     descriptor->pix_fmt = PIX_FMT_NONE;

  782.     switch(tag) {

  783.     case 0x3F01:

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

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

  786.             return AVERROR_INVALIDDATA;

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

  788.         if (!descriptor->sub_descriptors_refs)

  789.             return AVERROR(ENOMEM);

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

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

  792.         break;

  793.     case 0x3004:

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

  795.         break;

  796.     case 0x3006:

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

  798.         break;

  799.     case 0x3201: /* PictureEssenceCoding */

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

  801.         break;

  802.     case 0x3203:

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

  804.         break;

  805.     case 0x3202:

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

  807.         break;

  808.     case 0x320E:

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

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

  811.         break;

  812.     case 0x3301:

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

  814.         break;

  815.     case 0x3302:

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

  817.         break;

  818.     case 0x3308:

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

  820.         break;

  821.     case 0x3D03:

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

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

  824.         break;

  825.     case 0x3D06: /* SoundEssenceCompression */

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

  827.         break;

  828.     case 0x3D07:

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

  830.         break;

  831.     case 0x3D01:

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

  833.         break;

  834.     case 0x3401:

  835.         mxf_read_pixel_layout(pb, descriptor);

  836.         break;

  837.     default:

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

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

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

  841.             if (!descriptor->extradata)

  842.                 return AVERROR(ENOMEM);

  843.             descriptor->extradata_size = size;

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

  845.         }

  846.         break;

  847.     }

  848.     return 0;

  849. }

  850. 

  851. /*

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

  853.  * Returns: boolean

  854.  */

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

  856. {

  857.     int i;

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

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

  860.             return 0;

  861.     }

  862.     return 1;

  863. }

  864. 

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

  866. {

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

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

  869.             break;

  870.         uls++;

  871.     }

  872.     return uls;

  873. }

  874. 

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

  876. {

  877.     int i;

  878. 

  879.     if (!strong_ref)

  880.         return NULL;

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

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

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

  884.             return mxf->metadata_sets[i];

  885.         }

  886.     }

  887.     return NULL;

  888. }

  889. 

  890. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  891.     // video essence container uls

  892.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  893.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  894.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  895.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  896. };

  897. 

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

  899. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  900.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  901.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  902. };

  903. 

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

  905. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  906.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  907.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  908. };

  909. 

  910. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  911.     // sound essence container uls

  912.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  913.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  914.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  915.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  916.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  917. };

  918. 

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

  920. {

  921.     int i, j, nb_segments = 0;

  922.     MXFIndexTableSegment **unsorted_segments;

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

  924. 

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

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

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

  928.             nb_segments++;

  929. 

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

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

  932.         av_freep(sorted_segments);

  933.         av_free(unsorted_segments);

  934.         return AVERROR(ENOMEM);

  935.     }

  936. 

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

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

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

  940. 

  941.     *nb_sorted_segments = 0;

  942. 

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

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

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

  946. 

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

  948.             MXFIndexTableSegment *s = unsorted_segments[j];

  949. 

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

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

  952.              */

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

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

  955.                 best             = j;

  956.                 best_body_sid    = s->body_sid;

  957.                 best_index_sid   = s->index_sid;

  958.                 best_index_start = s->index_start_position;

  959.             }

  960.         }

  961. 

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

  963.         if (best == -1)

  964.             break;

  965. 

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

  967.         last_body_sid    = best_body_sid;

  968.         last_index_sid   = best_index_sid;

  969.         last_index_start = best_index_start;

  970.     }

  971. 

  972.     av_free(unsorted_segments);

  973. 

  974.     return 0;

  975. }

  976. 

  977. /**

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

  979.  */

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

  981. {

  982.     int x;

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

  984. 

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

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

  987. 

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

  989.             continue;

  990. 

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

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

  993.             return 0;

  994.         }

  995. 

  996.         offset -= p->essence_length;

  997.     }

  998. 

  999.     av_log(mxf->fc, AV_LOG_ERROR,

  1000.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1001.            offset_in, body_sid);

  1002. 

  1003.     return AVERROR_INVALIDDATA;

  1004. }

  1005. 

  1006. /**

  1007.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1008.  */

  1009. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1010. {

  1011.     int x;

  1012.     int64_t ret = 0;

  1013. 

  1014.     for (x = 0; x < mxf->partitions_count; x++) {

  1015.         MXFPartition *p = &mxf->partitions[x];

  1016. 

  1017.         if (p->body_sid != body_sid)

  1018.             continue;

  1019. 

  1020.         if (!p->essence_length)

  1021.             return 0;

  1022. 

  1023.         ret = p->essence_offset + p->essence_length;

  1024.     }

  1025. 

  1026.     return ret;

  1027. }

  1028. 

  1029. /* EditUnit -> absolute offset */

  1030. 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)

  1031. {

  1032.     int i;

  1033.     int64_t offset_temp = 0;

  1034. 

  1035.     for (i = 0; i < index_table->nb_segments; i++) {

  1036.         MXFIndexTableSegment *s = index_table->segments[i];

  1037. 

  1038.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1039. 

  1040.         if (edit_unit < s->index_start_position + s->index_duration) {

  1041.             int64_t index = edit_unit - s->index_start_position;

  1042. 

  1043.             if (s->edit_unit_byte_count)

  1044.                 offset_temp += s->edit_unit_byte_count * index;

  1045.             else if (s->nb_index_entries) {

  1046.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1047.                     index *= 2;     /* Avid index */

  1048. 

  1049.                 if (index < 0 || index > s->nb_index_entries) {

  1050.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1051.                            index_table->index_sid, s->index_start_position);

  1052.                     return AVERROR_INVALIDDATA;

  1053.                 }

  1054. 

  1055.                 offset_temp = s->stream_offset_entries[index];

  1056.             } else {

  1057.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1058.                        index_table->index_sid, s->index_start_position);

  1059.                 return AVERROR_INVALIDDATA;

  1060.             }

  1061. 

  1062.             if (edit_unit_out)

  1063.                 *edit_unit_out = edit_unit;

  1064. 

  1065.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1066.         } else {

  1067.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1068.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1069.         }

  1070.     }

  1071. 

  1072.     if (nag)

  1073.         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);

  1074. 

  1075.     return AVERROR_INVALIDDATA;

  1076. }

  1077. 

  1078. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1079. {

  1080.     int i, j, x;

  1081.     int8_t max_temporal_offset = -128;

  1082. 

  1083.     /* first compute how many entries we have */

  1084.     for (i = 0; i < index_table->nb_segments; i++) {

  1085.         MXFIndexTableSegment *s = index_table->segments[i];

  1086. 

  1087.         if (!s->nb_index_entries) {

  1088.             index_table->nb_ptses = 0;

  1089.             return 0;                               /* no TemporalOffsets */

  1090.         }

  1091. 

  1092.         index_table->nb_ptses += s->index_duration;

  1093.     }

  1094. 

  1095.     /* paranoid check */

  1096.     if (index_table->nb_ptses <= 0)

  1097.         return 0;

  1098. 

  1099.     if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||

  1100.         !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {

  1101.         av_freep(&index_table->ptses);

  1102.         return AVERROR(ENOMEM);

  1103.     }

  1104. 

  1105.     /* we may have a few bad TemporalOffsets

  1106.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1107.     for (x = 0; x < index_table->nb_ptses; x++)

  1108.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1109. 

  1110.     /**

  1111.      * We have this:

  1112.      *

  1113.      * x  TemporalOffset

  1114.      * 0:  0

  1115.      * 1:  1

  1116.      * 2:  1

  1117.      * 3: -2

  1118.      * 4:  1

  1119.      * 5:  1

  1120.      * 6: -2

  1121.      *

  1122.      * We want to transform it into this:

  1123.      *

  1124.      * x  DTS PTS

  1125.      * 0: -1   0

  1126.      * 1:  0   3

  1127.      * 2:  1   1

  1128.      * 3:  2   2

  1129.      * 4:  3   6

  1130.      * 5:  4   4

  1131.      * 6:  5   5

  1132.      *

  1133.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1134.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1135.      * The latter makes DTS <= PTS.

  1136.      */

  1137.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1138.         MXFIndexTableSegment *s = index_table->segments[i];

  1139.         int index_delta = 1;

  1140.         int n = s->nb_index_entries;

  1141. 

  1142.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1143.             index_delta = 2;    /* Avid index */

  1144.             /* ignore the last entry - it's the size of the essence container */

  1145.             n--;

  1146.         }

  1147. 

  1148.         for (j = 0; j < n; j += index_delta, x++) {

  1149.             int offset = s->temporal_offset_entries[j] / index_delta;

  1150.             int index  = x + offset;

  1151. 

  1152.             if (x >= index_table->nb_ptses) {

  1153.                 av_log(mxf->fc, AV_LOG_ERROR,

  1154.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1155.                        s->nb_index_entries, s->index_duration);

  1156.                 break;

  1157.             }

  1158. 

  1159.             index_table->fake_index[x].timestamp = x;

  1160.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1161. 

  1162.             if (index < 0 || index >= index_table->nb_ptses) {

  1163.                 av_log(mxf->fc, AV_LOG_ERROR,

  1164.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1165.                        x, offset, index);

  1166.                 continue;

  1167.             }

  1168. 

  1169.             index_table->ptses[index] = x;

  1170.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1171.         }

  1172.     }

  1173. 

  1174.     index_table->first_dts = -max_temporal_offset;

  1175. 

  1176.     return 0;

  1177. }

  1178. 

  1179. /**

  1180.  * Sorts and collects index table segments into index tables.

  1181.  * Also computes PTSes if possible.

  1182.  */

  1183. static int mxf_compute_index_tables(MXFContext *mxf)

  1184. {

  1185.     int i, j, k, ret, nb_sorted_segments;

  1186.     MXFIndexTableSegment **sorted_segments = NULL;

  1187. 

  1188.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1189.         nb_sorted_segments <= 0) {

  1190.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1191.         return 0;

  1192.     }

  1193. 

  1194.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1195.     for (i = 0; i < nb_sorted_segments; i++) {

  1196.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1197.             mxf->nb_index_tables++;

  1198.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1199.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1200.             ret = AVERROR_INVALIDDATA;

  1201.             goto finish_decoding_index;

  1202.         }

  1203.     }

  1204. 

  1205.     if (!(mxf->index_tables = av_calloc(mxf->nb_index_tables, sizeof(MXFIndexTable)))) {

  1206.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1207.         ret = AVERROR(ENOMEM);

  1208.         goto finish_decoding_index;

  1209.     }

  1210. 

  1211.     /* distribute sorted segments to index tables */

  1212.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1213.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1214.             /* next IndexSID */

  1215.             j++;

  1216.         }

  1217. 

  1218.         mxf->index_tables[j].nb_segments++;

  1219.     }

  1220. 

  1221.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1222.         MXFIndexTable *t = &mxf->index_tables[j];

  1223. 

  1224.         if (!(t->segments = av_calloc(t->nb_segments, sizeof(MXFIndexTableSegment*)))) {

  1225.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment pointer array\n");

  1226.             ret = AVERROR(ENOMEM);

  1227.             goto finish_decoding_index;

  1228.         }

  1229. 

  1230.         if (sorted_segments[i]->index_start_position)

  1231.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1232.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1233. 

  1234.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1235.         t->index_sid = sorted_segments[i]->index_sid;

  1236.         t->body_sid = sorted_segments[i]->body_sid;

  1237. 

  1238.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1239.             goto finish_decoding_index;

  1240. 

  1241.         /* fix zero IndexDurations */

  1242.         for (k = 0; k < t->nb_segments; k++) {

  1243.             if (t->segments[k]->index_duration)

  1244.                 continue;

  1245. 

  1246.             if (t->nb_segments > 1)

  1247.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1248.                        t->index_sid, k);

  1249. 

  1250.             if (mxf->fc->nb_streams <= 0) {

  1251.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1252.                 break;

  1253.             }

  1254. 

  1255.             /* assume the first stream's duration is reasonable

  1256.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1257.              */

  1258.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1259.             break;

  1260.         }

  1261.     }

  1262. 

  1263.     ret = 0;

  1264. finish_decoding_index:

  1265.     av_free(sorted_segments);

  1266.     return ret;

  1267. }

  1268. 

  1269. static int mxf_is_intra_only(MXFDescriptor *descriptor)

  1270. {

  1271.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1272.                             &descriptor->essence_container_ul)->id != CODEC_ID_NONE ||

  1273.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1274.                             &descriptor->essence_codec_ul)->id     != CODEC_ID_NONE;

  1275. }

  1276. 

  1277. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1278. {

  1279.     MXFPackage *material_package = NULL;

  1280.     MXFPackage *temp_package = NULL;

  1281.     int i, j, k, ret;

  1282. 

  1283.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1284.     /* TODO: handle multiple material packages (OP3x) */

  1285.     for (i = 0; i < mxf->packages_count; i++) {

  1286.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1287.         if (material_package) break;

  1288.     }

  1289.     if (!material_package) {

  1290.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1291.         return AVERROR_INVALIDDATA;

  1292.     }

  1293. 

  1294.     for (i = 0; i < material_package->tracks_count; i++) {

  1295.         MXFPackage *source_package = NULL;

  1296.         MXFTrack *material_track = NULL;

  1297.         MXFTrack *source_track = NULL;

  1298.         MXFTrack *temp_track = NULL;

  1299.         MXFDescriptor *descriptor = NULL;

  1300.         MXFStructuralComponent *component = NULL;

  1301.         UID *essence_container_ul = NULL;

  1302.         const MXFCodecUL *codec_ul = NULL;

  1303.         const MXFCodecUL *container_ul = NULL;

  1304.         const MXFCodecUL *pix_fmt_ul = NULL;

  1305.         AVStream *st;

  1306. 

  1307.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1308.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1309.             continue;

  1310.         }

  1311. 

  1312.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1313.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1314.             continue;

  1315.         }

  1316. 

  1317.         /* TODO: handle multiple source clips */

  1318.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1319.             /* TODO: handle timecode component */

  1320.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1321.             if (!component)

  1322.                 continue;

  1323. 

  1324.             for (k = 0; k < mxf->packages_count; k++) {

  1325.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1326.                 if (!temp_package)

  1327.                     continue;

  1328.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1329.                     source_package = temp_package;

  1330.                     break;

  1331.                 }

  1332.             }

  1333.             if (!source_package) {

  1334.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1335.                 break;

  1336.             }

  1337.             for (k = 0; k < source_package->tracks_count; k++) {

  1338.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1339.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1340.                     ret = AVERROR_INVALIDDATA;

  1341.                     goto fail_and_free;

  1342.                 }

  1343.                 if (temp_track->track_id == component->source_track_id) {

  1344.                     source_track = temp_track;

  1345.                     break;

  1346.                 }

  1347.             }

  1348.             if (!source_track) {

  1349.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1350.                 break;

  1351.             }

  1352.         }

  1353.         if (!source_track || !component)

  1354.             continue;

  1355. 

  1356.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1357.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1358.             ret = AVERROR_INVALIDDATA;

  1359.             goto fail_and_free;

  1360.         }

  1361. 

  1362.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1363.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1364.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1365.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1366.             continue;

  1367.         }

  1368. 

  1369.         st = avformat_new_stream(mxf->fc, NULL);

  1370.         if (!st) {

  1371.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1372.             ret = AVERROR(ENOMEM);

  1373.             goto fail_and_free;

  1374.         }

  1375.         st->id = source_track->track_id;

  1376.         st->priv_data = source_track;

  1377.         st->duration = component->duration;

  1378.         if (st->duration == -1)

  1379.             st->duration = AV_NOPTS_VALUE;

  1380.         st->start_time = component->start_position;

  1381.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1382. 

  1383.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1384.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

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

  1386. 

  1387.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1388.         if (source_package->descriptor) {

  1389.             if (source_package->descriptor->type == MultipleDescriptor) {

  1390.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1391.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1392. 

  1393.                     if (!sub_descriptor) {

  1394.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1395.                         continue;

  1396.                     }

  1397.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1398.                         descriptor = sub_descriptor;

  1399.                         break;

  1400.                     }

  1401.                 }

  1402.             } else if (source_package->descriptor->type == Descriptor)

  1403.                 descriptor = source_package->descriptor;

  1404.         }

  1405.         if (!descriptor) {

  1406.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1407.             continue;

  1408.         }

  1409.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1410.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1411.         essence_container_ul = &descriptor->essence_container_ul;

  1412.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1413.          * is not allowed according to s429-6, try to find correct information anyway */

  1414.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1415.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1416.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1417.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1418.                 if (metadata->type == CryptoContext) {

  1419.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1420.                     break;

  1421.                 }

  1422.             }

  1423.         }

  1424. 

  1425.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1426.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1427.         st->codec->codec_id = codec_ul->id;

  1428.         if (descriptor->extradata) {

  1429.             st->codec->extradata = descriptor->extradata;

  1430.             st->codec->extradata_size = descriptor->extradata_size;

  1431.         }

  1432.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1433.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1434.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1435.             if (st->codec->codec_id == CODEC_ID_NONE)

  1436.                 st->codec->codec_id = container_ul->id;

  1437.             st->codec->width = descriptor->width;

  1438.             st->codec->height = descriptor->height;

  1439.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO) {

  1440.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1441.                 if (st->codec->pix_fmt == PIX_FMT_NONE) {

  1442.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls, &descriptor->essence_codec_ul);

  1443.                     st->codec->pix_fmt = pix_fmt_ul->id;

  1444.                     if (st->codec->pix_fmt == PIX_FMT_NONE) {

  1445.                         /* support files created before RP224v10 by defaulting to UYVY422

  1446.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1447.                         if (descriptor->horiz_subsampling == 2 &&

  1448.                             descriptor->vert_subsampling == 1 &&

  1449.                             descriptor->component_depth == 8) {

  1450.                             st->codec->pix_fmt = PIX_FMT_UYVY422;

  1451.                         }

  1452.                     }

  1453.                 }

  1454.             }

  1455.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1456.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1457.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1458.             if (st->codec->codec_id == CODEC_ID_NONE)

  1459.                 st->codec->codec_id = container_ul->id;

  1460.             st->codec->channels = descriptor->channels;

  1461.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1462. 

  1463.             if (descriptor->sample_rate.den > 0)

  1464.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1465. 

  1466.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1467.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1468.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1469.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1470.                 else if (descriptor->bits_per_sample == 32)

  1471.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1472.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1473.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1474.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1475.                 else if (descriptor->bits_per_sample == 32)

  1476.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1477.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1478.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1479.             }

  1480.         }

  1481.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1482.             /* TODO: decode timestamps */

  1483.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1484.         }

  1485.     }

  1486. 

  1487.     ret = 0;

  1488. fail_and_free:

  1489.     return ret;

  1490. }

  1491. 

  1492. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1493.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1494.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1495.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1496.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1497.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1498.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1499.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1500.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1501.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1502.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1503.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1504.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1505.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1506.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1507.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1508.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1509.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1510.     { { 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 */

  1511.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1512.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1513.     { { 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 */

  1514.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1515.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1516.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1517.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1518.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1519.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1520.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1521. };

  1522. 

  1523. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1524. {

  1525.     AVIOContext *pb = mxf->fc->pb;

  1526.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1527.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1528. 

  1529.     if (!ctx)

  1530.         return AVERROR(ENOMEM);

  1531.     while (avio_tell(pb) + 4 < klv_end && !url_feof(pb)) {

  1532.         int ret;

  1533.         int tag = avio_rb16(pb);

  1534.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1535.         uint64_t next = avio_tell(pb) + size;

  1536.         UID uid = {0};

  1537. 

  1538.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1539.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1540.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1541.             continue;

  1542.         }

  1543.         if (tag > 0x7FFF) { /* dynamic tag */

  1544.             int i;

  1545.             for (i = 0; i < mxf->local_tags_count; i++) {

  1546.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1547.                 if (local_tag == tag) {

  1548.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1549.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1550.                     PRINT_KEY(mxf->fc, "uid", uid);

  1551.                 }

  1552.             }

  1553.         }

  1554.         if (ctx_size && tag == 0x3C0A)

  1555.             avio_read(pb, ctx->uid, 16);

  1556.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1557.             return ret;

  1558. 

  1559.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1560.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1561.         if (avio_tell(pb) > klv_end) {

  1562.             av_log(mxf->fc, AV_LOG_ERROR,

  1563.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1564.                    tag, klv->offset);

  1565.             return AVERROR_INVALIDDATA;

  1566.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1567.             avio_seek(pb, next, SEEK_SET);

  1568.     }

  1569.     if (ctx_size) ctx->type = type;

  1570.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1571. }

  1572. 

  1573. /**

  1574.  * Seeks to the previous partition, if possible

  1575.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1576.  */

  1577. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1578. {

  1579.     AVIOContext *pb = mxf->fc->pb;

  1580. 

  1581.     if (!mxf->current_partition ||

  1582.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1583.         return 0;   /* we've parsed all partitions */

  1584. 

  1585.     /* seek to previous partition */

  1586.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1587.     mxf->current_partition = NULL;

  1588. 

  1589.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1590. 

  1591.     return 1;

  1592. }

  1593. 

  1594. /**

  1595.  * Called when essence is encountered

  1596.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1597.  */

  1598. static int mxf_parse_handle_essence(MXFContext *mxf)

  1599. {

  1600.     AVIOContext *pb = mxf->fc->pb;

  1601.     int64_t ret;

  1602. 

  1603.     if (mxf->parsing_backward) {

  1604.         return mxf_seek_to_previous_partition(mxf);

  1605.     } else {

  1606.         if (!mxf->footer_partition) {

  1607.             av_dlog(mxf->fc, "no footer\n");

  1608.             return 0;

  1609.         }

  1610. 

  1611.         av_dlog(mxf->fc, "seeking to footer\n");

  1612. 

  1613.         /* remember where we were so we don't end up seeking further back than this */

  1614.         mxf->last_forward_tell = avio_tell(pb);

  1615. 

  1616.         if (!pb->seekable) {

  1617.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1618.             return -1;

  1619.         }

  1620. 

  1621.         /* seek to footer partition and parse backward */

  1622.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1623.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1624.                    mxf->run_in + mxf->footer_partition, ret);

  1625.             return ret;

  1626.         }

  1627. 

  1628.         mxf->current_partition = NULL;

  1629.         mxf->parsing_backward = 1;

  1630.     }

  1631. 

  1632.     return 1;

  1633. }

  1634. 

  1635. /**

  1636.  * Called when the next partition or EOF is encountered

  1637.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1638.  */

  1639. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1640. {

  1641.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1642. }

  1643. 

  1644. /**

  1645.  * Figures out the proper offset and length of the essence container in each partition

  1646.  */

  1647. static void mxf_compute_essence_containers(MXFContext *mxf)

  1648. {

  1649.     int x;

  1650. 

  1651.     /* everything is already correct */

  1652.     if (mxf->op == OPAtom)

  1653.         return;

  1654. 

  1655.     for (x = 0; x < mxf->partitions_count; x++) {

  1656.         MXFPartition *p = &mxf->partitions[x];

  1657. 

  1658.         if (!p->body_sid)

  1659.             continue;       /* BodySID == 0 -> no essence */

  1660. 

  1661.         if (x >= mxf->partitions_count - 1)

  1662.             break;          /* last partition - can't compute length (and we don't need to) */

  1663. 

  1664.         /* essence container spans to the next partition */

  1665.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1666. 

  1667.         if (p->essence_length < 0) {

  1668.             /* next ThisPartition < essence_offset */

  1669.             p->essence_length = 0;

  1670.             av_log(mxf->fc, AV_LOG_ERROR,

  1671.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1672.                    x+1, mxf->partitions[x+1].this_partition);

  1673.         }

  1674.     }

  1675. }

  1676. 

  1677. static int64_t round_to_kag(int64_t position, int kag_size)

  1678. {

  1679.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1680.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1681.     int64_t ret = (position / kag_size) * kag_size;

  1682.     return ret == position ? ret : ret + kag_size;

  1683. }

  1684. 

  1685. static int is_pcm(enum CodecID codec_id)

  1686. {

  1687.     /* we only care about "normal" PCM codecs until we get samples */

  1688.     return codec_id >= CODEC_ID_PCM_S16LE && codec_id < CODEC_ID_PCM_S24DAUD;

  1689. }

  1690. 

  1691. /**

  1692.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1693.  * very small (2, 4..). In those cases we should read more than one

  1694.  * sample per call to mxf_read_packet().

  1695.  */

  1696. static void mxf_handle_small_eubc(AVFormatContext *s)

  1697. {

  1698.     MXFContext *mxf = s->priv_data;

  1699. 

  1700.     /* assuming non-OPAtom == frame wrapped

  1701.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1702.     if (mxf->op != OPAtom)

  1703.         return;

  1704. 

  1705.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1706.     if (s->nb_streams != 1                                     ||

  1707.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1708.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1709.         mxf->nb_index_tables != 1                              ||

  1710.         mxf->index_tables[0].nb_segments != 1                  ||

  1711.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1712.         return;

  1713. 

  1714.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1715.     /* TODO: We could compute this from the ratio between the audio

  1716.      *       and video edit rates for 48 kHz NTSC we could use the

  1717.      *       1802-1802-1802-1802-1801 pattern. */

  1718.     mxf->edit_units_per_packet = 1920;

  1719. }

  1720. 

  1721. static int mxf_read_header(AVFormatContext *s)

  1722. {

  1723.     MXFContext *mxf = s->priv_data;

  1724.     KLVPacket klv;

  1725.     int64_t essence_offset = 0;

  1726.     int ret;

  1727. 

  1728.     mxf->last_forward_tell = INT64_MAX;

  1729.     mxf->edit_units_per_packet = 1;

  1730. 

  1731.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1732.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1733.         return AVERROR_INVALIDDATA;

  1734.     }

  1735.     avio_seek(s->pb, -14, SEEK_CUR);

  1736.     mxf->fc = s;

  1737.     mxf->run_in = avio_tell(s->pb);

  1738. 

  1739.     while (!url_feof(s->pb)) {

  1740.         const MXFMetadataReadTableEntry *metadata;

  1741. 

  1742.         if (klv_read_packet(&klv, s->pb) < 0) {

  1743.             /* EOF - seek to previous partition or stop */

  1744.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1745.                 break;

  1746.             else

  1747.                 continue;

  1748.         }

  1749. 

  1750.         PRINT_KEY(s, "read header", klv.key);

  1751.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1752.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

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

  1754.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1755.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1756. 

  1757.             if (!mxf->current_partition) {

  1758.                 av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");

  1759.                 return AVERROR_INVALIDDATA;

  1760.             }

  1761. 

  1762.             if (!mxf->current_partition->essence_offset) {

  1763.                 /* for OP1a we compute essence_offset

  1764.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1765.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1766.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1767.                  */

  1768.                 int64_t op1a_essence_offset =

  1769.                     round_to_kag(mxf->current_partition->this_partition +

  1770.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1771.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1772.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1773. 

  1774.                 if (mxf->op == OPAtom) {

  1775.                     /* point essence_offset to the actual data

  1776.                     * OPAtom has all the essence in one big KLV

  1777.                     */

  1778.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1779.                     mxf->current_partition->essence_length = klv.length;

  1780.                 } else {

  1781.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1782.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1783.                 }

  1784.             }

  1785. 

  1786.             if (!essence_offset)

  1787.                 essence_offset = klv.offset;

  1788. 

  1789.             /* seek to footer, previous partition or stop */

  1790.             if (mxf_parse_handle_essence(mxf) <= 0)

  1791.                 break;

  1792.             continue;

  1793.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1794.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1795.             /* next partition pack - keep going, seek to previous partition or stop */

  1796.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1797.                 break;

  1798.         }

  1799. 

  1800.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1801.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1802.                 int res;

  1803.                 if (klv.key[5] == 0x53) {

  1804.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1805.                 } else {

  1806.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1807.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1808. 

  1809.                     /* only seek forward, else this can loop for a long time */

  1810.                     if (avio_tell(s->pb) > next) {

  1811.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1812.                                klv.offset);

  1813.                         return AVERROR_INVALIDDATA;

  1814.                     }

  1815. 

  1816.                     avio_seek(s->pb, next, SEEK_SET);

  1817.                 }

  1818.                 if (res < 0) {

  1819.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1820.                     return res;

  1821.                 }

  1822.                 break;

  1823.             }

  1824.         }

  1825.         if (!metadata->read)

  1826.             avio_skip(s->pb, klv.length);

  1827.     }

  1828.     /* FIXME avoid seek */

  1829.     if (!essence_offset)  {

  1830.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1831.         return AVERROR_INVALIDDATA;

  1832.     }

  1833.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1834. 

  1835.     mxf_compute_essence_containers(mxf);

  1836. 

  1837.     /* we need to do this before computing the index tables

  1838.      * to be able to fill in zero IndexDurations with st->duration */

  1839.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1840.         return ret;

  1841. 

  1842.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1843.         return ret;

  1844. 

  1845.     if (mxf->nb_index_tables > 1) {

  1846.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1847.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1848.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1849.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1850.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1851.         return AVERROR_INVALIDDATA;

  1852.     }

  1853. 

  1854.     mxf_handle_small_eubc(s);

  1855. 

  1856.     return 0;

  1857. }

  1858. 

  1859. /**

  1860.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1861.  * @return next_ofs if OK, <0 on error

  1862.  */

  1863. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  1864. {

  1865.     int64_t last_ofs = -1, next_ofs = -1;

  1866.     MXFIndexTable *t = &mxf->index_tables[0];

  1867. 

  1868.     /* this is called from the OP1a demuxing logic, which means there

  1869.      * may be no index tables */

  1870.     if (mxf->nb_index_tables <= 0)

  1871.         return -1;

  1872. 

  1873.     /* find mxf->current_edit_unit so that the next edit unit starts ahead of current_offset */

  1874.     while (mxf->current_edit_unit >= 0) {

  1875.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_ofs, 0) < 0)

  1876.             return -1;

  1877. 

  1878.         if (next_ofs <= last_ofs) {

  1879.             /* large next_ofs didn't change or current_edit_unit wrapped

  1880.              * around this fixes the infinite loop on zzuf3.mxf */

  1881.             av_log(mxf->fc, AV_LOG_ERROR,

  1882.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1883.             return - 1;

  1884.         }

  1885. 

  1886.         if (next_ofs > current_offset)

  1887.             break;

  1888. 

  1889.         last_ofs = next_ofs;

  1890.         mxf->current_edit_unit++;

  1891.     }

  1892. 

  1893.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files may lack IndexEntryArrays */

  1894.     if (mxf->current_edit_unit < 0)

  1895.         return -1;

  1896. 

  1897.     return next_ofs;

  1898. }

  1899. 

  1900. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1901. {

  1902.     KLVPacket klv;

  1903.     MXFContext *mxf = s->priv_data;

  1904. 

  1905.     while (!url_feof(s->pb)) {

  1906.         int ret;

  1907.         if (klv_read_packet(&klv, s->pb) < 0)

  1908.             return -1;

  1909.         PRINT_KEY(s, "read packet", klv.key);

  1910.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1911.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1912.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  1913.             if (ret < 0) {

  1914.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1915.                 return AVERROR_INVALIDDATA;

  1916.             }

  1917.             return 0;

  1918.         }

  1919.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1920.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  1921.             int index = mxf_get_stream_index(s, &klv);

  1922.             int64_t next_ofs, next_klv;

  1923. 

  1924.             if (index < 0) {

  1925.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  1926.                 goto skip;

  1927.             }

  1928.             if (s->streams[index]->discard == AVDISCARD_ALL)

  1929.                 goto skip;

  1930. 

  1931.             next_klv = avio_tell(s->pb) + klv.length;

  1932.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  1933. 

  1934.             if (next_ofs >= 0 && next_klv > next_ofs) {

  1935.                 /* if this check is hit then it's possible OPAtom was treated as OP1a

  1936.                  * truncate the packet since it's probably very large (>2 GiB is common) */

  1937.                 av_log_ask_for_sample(s,

  1938.                     "KLV for edit unit %i extends into next edit unit - OPAtom misinterpreted as OP1a?\n",

  1939.                     mxf->current_edit_unit);

  1940.                 klv.length = next_ofs - avio_tell(s->pb);

  1941.             }

  1942. 

  1943.             /* check for 8 channels AES3 element */

  1944.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  1945.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  1946.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  1947.                     return AVERROR_INVALIDDATA;

  1948.                 }

  1949.             } else {

  1950.                 ret = av_get_packet(s->pb, pkt, klv.length);

  1951.                 if (ret < 0)

  1952.                     return ret;

  1953.             }

  1954.             pkt->stream_index = index;

  1955.             pkt->pos = klv.offset;

  1956. 

  1957.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  1958.                 /* mxf->current_edit_unit good - see if we have an index table to derive timestamps from */

  1959.                 MXFIndexTable *t = &mxf->index_tables[0];

  1960. 

  1961.                 if (mxf->nb_index_tables >= 1 && mxf->current_edit_unit < t->nb_ptses) {

  1962.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  1963.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  1964.                 }

  1965.             }

  1966. 

  1967.             /* seek for truncated packets */

  1968.             avio_seek(s->pb, next_klv, SEEK_SET);

  1969. 

  1970.             return 0;

  1971.         } else

  1972.         skip:

  1973.             avio_skip(s->pb, klv.length);

  1974.     }

  1975.     return AVERROR_EOF;

  1976. }

  1977. 

  1978. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  1979. {

  1980.     MXFContext *mxf = s->priv_data;

  1981.     int ret, size;

  1982.     int64_t ret64, pos, next_pos;

  1983.     AVStream *st;

  1984.     MXFIndexTable *t;

  1985.     int edit_units;

  1986. 

  1987.     if (mxf->op != OPAtom)

  1988.         return mxf_read_packet_old(s, pkt);

  1989. 

  1990.     /* OPAtom - clip wrapped demuxing */

  1991.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  1992.     st = s->streams[0];

  1993.     t = &mxf->index_tables[0];

  1994. 

  1995.     if (mxf->current_edit_unit >= st->duration)

  1996.         return AVERROR_EOF;

  1997. 

  1998.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  1999. 

  2000.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2001.         return ret;

  2002. 

  2003.     /* compute size by finding the next edit unit or the end of the essence container

  2004.      * not pretty, but it works */

  2005.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2006.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2007.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2008.         return AVERROR_INVALIDDATA;

  2009.     }

  2010. 

  2011.     if ((size = next_pos - pos) <= 0) {

  2012.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2013.         return AVERROR_INVALIDDATA;

  2014.     }

  2015. 

  2016.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2017.         return ret64;

  2018. 

  2019.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2020.             return ret < 0 ? ret : AVERROR_EOF;

  2021. 

  2022.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2023.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2024.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2025.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2026.     }

  2027. 

  2028.     pkt->stream_index = 0;

  2029.     mxf->current_edit_unit += edit_units;

  2030. 

  2031.     return 0;

  2032. }

  2033. 

  2034. static int mxf_read_close(AVFormatContext *s)

  2035. {

  2036.     MXFContext *mxf = s->priv_data;

  2037.     MXFIndexTableSegment *seg;

  2038.     int i;

  2039. 

  2040.     av_freep(&mxf->packages_refs);

  2041. 

  2042.     for (i = 0; i < s->nb_streams; i++)

  2043.         s->streams[i]->priv_data = NULL;

  2044. 

  2045.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2046.         switch (mxf->metadata_sets[i]->type) {

  2047.         case MultipleDescriptor:

  2048.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2049.             break;

  2050.         case Sequence:

  2051.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2052.             break;

  2053.         case SourcePackage:

  2054.         case MaterialPackage:

  2055.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2056.             break;

  2057.         case IndexTableSegment:

  2058.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2059.             av_freep(&seg->temporal_offset_entries);

  2060.             av_freep(&seg->flag_entries);

  2061.             av_freep(&seg->stream_offset_entries);

  2062.             break;

  2063.         default:

  2064.             break;

  2065.         }

  2066.         av_freep(&mxf->metadata_sets[i]);

  2067.     }

  2068.     av_freep(&mxf->partitions);

  2069.     av_freep(&mxf->metadata_sets);

  2070.     av_freep(&mxf->aesc);

  2071.     av_freep(&mxf->local_tags);

  2072. 

  2073.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2074.         av_freep(&mxf->index_tables[i].segments);

  2075.         av_freep(&mxf->index_tables[i].ptses);

  2076.         av_freep(&mxf->index_tables[i].fake_index);

  2077.     }

  2078.     av_freep(&mxf->index_tables);

  2079. 

  2080.     return 0;

  2081. }

  2082. 

  2083. static int mxf_probe(AVProbeData *p) {

  2084.     uint8_t *bufp = p->buf;

  2085.     uint8_t *end = p->buf + p->buf_size;

  2086. 

  2087.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2088.         return 0;

  2089. 

  2090.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2091.     end -= sizeof(mxf_header_partition_pack_key);

  2092.     for (; bufp < end; bufp++) {

  2093.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2094.             return AVPROBE_SCORE_MAX;

  2095.     }

  2096.     return 0;

  2097. }

  2098. 

  2099. /* rudimentary byte seek */

  2100. /* XXX: use MXF Index */

  2101. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2102. {

  2103.     AVStream *st = s->streams[stream_index];

  2104.     int64_t seconds;

  2105.     MXFContext* mxf = s->priv_data;

  2106.     int64_t seekpos;

  2107.     int ret;

  2108.     MXFIndexTable *t;

  2109. 

  2110.     if (mxf->index_tables <= 0) {

  2111.     if (!s->bit_rate)

  2112.         return AVERROR_INVALIDDATA;

  2113.     if (sample_time < 0)

  2114.         sample_time = 0;

  2115.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2116. 

  2117.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  2118.         return ret;

  2119.     ff_update_cur_dts(s, st, sample_time);

  2120.     } else {

  2121.         t = &mxf->index_tables[0];

  2122. 

  2123.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2124.          * this also means we allow seeking before the start */

  2125.         sample_time = FFMAX(sample_time, 0);

  2126. 

  2127.         if (t->fake_index) {

  2128.             /* behave as if we have a proper index */

  2129.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2130.                 return sample_time;

  2131.         } else {

  2132.             /* no IndexEntryArray (one or more CBR segments)

  2133.              * make sure we don't seek past the end */

  2134.             sample_time = FFMIN(sample_time, st->duration - 1);

  2135.         }

  2136. 

  2137.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2138.             return ret;

  2139. 

  2140.         ff_update_cur_dts(s, st, sample_time);

  2141.         mxf->current_edit_unit = sample_time;

  2142.         avio_seek(s->pb, seekpos, SEEK_SET);

  2143.     }

  2144.     return 0;

  2145. }

  2146. 

  2147. AVInputFormat ff_mxf_demuxer = {

  2148.     .name           = "mxf",

  2149.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  2150.     .priv_data_size = sizeof(MXFContext),

  2151.     .read_probe     = mxf_probe,

  2152.     .read_header    = mxf_read_header,

  2153.     .read_packet    = mxf_read_packet,

  2154.     .read_close     = mxf_read_close,

  2155.     .read_seek      = mxf_read_seek,

  2156. };