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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. #include <stdint.h>

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  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; /* Field height, not frame height */

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

  137.     int channels;

  138.     int bits_per_sample;

  139.     unsigned int component_depth;

  140.     unsigned int horiz_subsampling;

  141.     unsigned int vert_subsampling;

  142.     UID *sub_descriptors_refs;

  143.     int sub_descriptors_count;

  144.     int linked_track_id;

  145.     uint8_t *extradata;

  146.     int extradata_size;

  147.     enum AVPixelFormat pix_fmt;

  148. } MXFDescriptor;

  149. 

  150. typedef struct {

  151.     UID uid;

  152.     enum MXFMetadataSetType type;

  153.     int edit_unit_byte_count;

  154.     int index_sid;

  155.     int body_sid;

  156.     AVRational index_edit_rate;

  157.     uint64_t index_start_position;

  158.     uint64_t index_duration;

  159.     int8_t *temporal_offset_entries;

  160.     int *flag_entries;

  161.     uint64_t *stream_offset_entries;

  162.     int nb_index_entries;

  163. } MXFIndexTableSegment;

  164. 

  165. typedef struct {

  166.     UID uid;

  167.     enum MXFMetadataSetType type;

  168.     UID package_uid;

  169.     UID *tracks_refs;

  170.     int tracks_count;

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

  172.     UID descriptor_ref;

  173. } MXFPackage;

  174. 

  175. typedef struct {

  176.     UID uid;

  177.     enum MXFMetadataSetType type;

  178. } MXFMetadataSet;

  179. 

  180. /* decoded index table */

  181. typedef struct {

  182.     int index_sid;

  183.     int body_sid;

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

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

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

  187.     int nb_segments;

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

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

  190. } MXFIndexTable;

  191. 

  192. typedef struct {

  193.     MXFPartition *partitions;

  194.     unsigned partitions_count;

  195.     MXFOP op;

  196.     UID *packages_refs;

  197.     int packages_count;

  198.     MXFMetadataSet **metadata_sets;

  199.     int metadata_sets_count;

  200.     AVFormatContext *fc;

  201.     struct AVAES *aesc;

  202.     uint8_t *local_tags;

  203.     int local_tags_count;

  204.     uint64_t footer_partition;

  205.     KLVPacket current_klv_data;

  206.     int current_klv_index;

  207.     int run_in;

  208.     MXFPartition *current_partition;

  209.     int parsing_backward;

  210.     int64_t last_forward_tell;

  211.     int last_forward_partition;

  212.     int current_edit_unit;

  213.     int nb_index_tables;

  214.     MXFIndexTable *index_tables;

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

  216. } MXFContext;

  217. 

  218. enum MXFWrappingScheme {

  219.     Frame,

  220.     Clip,

  221. };

  222. 

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

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

  225. 

  226. typedef struct {

  227.     const UID key;

  228.     MXFMetadataReadFunc *read;

  229.     int ctx_size;

  230.     enum MXFMetadataSetType type;

  231. } MXFMetadataReadTableEntry;

  232. 

  233. /* partial keys to match */

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

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

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

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

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

  239. /* complete keys to match */

  240. 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 };

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

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

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

  244. 

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

  246. 

  247. static int64_t klv_decode_ber_length(AVIOContext *pb)

  248. {

  249.     uint64_t size = avio_r8(pb);

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

  251.         int bytes_num = size & 0x7f;

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

  253.         if (bytes_num > 8)

  254.             return AVERROR_INVALIDDATA;

  255.         size = 0;

  256.         while (bytes_num--)

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

  258.     }

  259.     return size;

  260. }

  261. 

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

  263. {

  264.     int i, b;

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

  266.         b = avio_r8(pb);

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

  268.             i = 0;

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

  270.             i = -1;

  271.     }

  272.     return i == size;

  273. }

  274. 

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

  276. {

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

  278.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  284. }

  285. 

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

  287. {

  288.     int i;

  289. 

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

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

  292.         /* SMPTE 379M 7.3 */

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

  294.             return i;

  295.     }

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

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

  298. }

  299. 

  300. /* XXX: use AVBitStreamFilter */

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

  302. {

  303.     const uint8_t *buf_ptr, *end_ptr;

  304.     uint8_t *data_ptr;

  305.     int i;

  306. 

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

  308.         return AVERROR_INVALIDDATA;

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

  310.     if (length < 0)

  311.         return length;

  312.     data_ptr = pkt->data;

  313.     end_ptr = pkt->data + length;

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

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

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

  317.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  320.             else

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

  322.         }

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

  324.     }

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

  326.     return 0;

  327. }

  328. 

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

  330. {

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

  332.     MXFContext *mxf = s->priv_data;

  333.     AVIOContext *pb = s->pb;

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

  335.     int64_t size;

  336.     uint64_t orig_size;

  337.     uint64_t plaintext_size;

  338.     uint8_t ivec[16];

  339.     uint8_t tmpbuf[16];

  340.     int index;

  341. 

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

  343.         mxf->aesc = av_aes_alloc();

  344.         if (!mxf->aesc)

  345.             return AVERROR(ENOMEM);

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

  347.     }

  348.     // crypto context

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

  350.     // plaintext offset

  351.     klv_decode_ber_length(pb);

  352.     plaintext_size = avio_rb64(pb);

  353.     // source klv key

  354.     klv_decode_ber_length(pb);

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

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

  357.         return AVERROR_INVALIDDATA;

  358.     index = mxf_get_stream_index(s, klv);

  359.     if (index < 0)

  360.         return AVERROR_INVALIDDATA;

  361.     // source size

  362.     klv_decode_ber_length(pb);

  363.     orig_size = avio_rb64(pb);

  364.     if (orig_size < plaintext_size)

  365.         return AVERROR_INVALIDDATA;

  366.     // enc. code

  367.     size = klv_decode_ber_length(pb);

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

  369.         return AVERROR_INVALIDDATA;

  370.     avio_read(pb, ivec, 16);

  371.     avio_read(pb, tmpbuf, 16);

  372.     if (mxf->aesc)

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

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

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

  376.     size -= 32;

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

  378.     if (size < 0)

  379.         return size;

  380.     else if (size < plaintext_size)

  381.         return AVERROR_INVALIDDATA;

  382.     size -= plaintext_size;

  383.     if (mxf->aesc)

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

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

  386.     av_shrink_packet(pkt, orig_size);

  387.     pkt->stream_index = index;

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

  389.     return 0;

  390. }

  391. 

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

  393. {

  394.     MXFContext *mxf = arg;

  395.     int item_num = avio_rb32(pb);

  396.     int item_len = avio_rb32(pb);

  397. 

  398.     if (item_len != 18) {

  399.         avpriv_request_sample(pb, "Primer pack item length %d", 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;

  416.     UID op;

  417.     uint64_t footer_partition;

  418.     uint32_t nb_essence_containers;

  419.     int err;

  420. 

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

  422.         return AVERROR(ENOMEM);

  423. 

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

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

  426.         mxf->partitions_count = 0;

  427.         return err;

  428.     }

  429. 

  430.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  437.     } else {

  438.         mxf->last_forward_partition++;

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

  440.     }

  441. 

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

  443.     mxf->partitions_count++;

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

  445. 

  446.     switch(uid[13]) {

  447.     case 2:

  448.         partition->type = Header;

  449.         break;

  450.     case 3:

  451.         partition->type = BodyPartition;

  452.         break;

  453.     case 4:

  454.         partition->type = Footer;

  455.         break;

  456.     default:

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

  458.         return AVERROR_INVALIDDATA;

  459.     }

  460. 

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

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

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

  464.     avio_skip(pb, 4);

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

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

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

  468.     footer_partition = avio_rb64(pb);

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

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

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

  472.     avio_skip(pb, 8);

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

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

  475.     nb_essence_containers = avio_rb32(pb);

  476. 

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

  478.     if (footer_partition) {

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

  480.             av_log(mxf->fc, AV_LOG_ERROR,

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

  482.                    mxf->footer_partition, footer_partition);

  483.         } else {

  484.             mxf->footer_partition = footer_partition;

  485.         }

  486.     }

  487. 

  488.     av_dlog(mxf->fc,

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

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

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

  492.             partition->this_partition,

  493.             partition->previous_partition, footer_partition,

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

  495. 

  496.     /* sanity check PreviousPartition if set */

  497.     if (partition->previous_partition &&

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

  499.         av_log(mxf->fc, AV_LOG_ERROR,

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

  501.         return AVERROR_INVALIDDATA;

  502.     }

  503. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  517.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  519.         if (nb_essence_containers != 1) {

  520.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  521. 

  522.             /* only nag once */

  523.             if (!mxf->op)

  524.                 av_log(mxf->fc, AV_LOG_WARNING,

  525.                        "\"OPAtom\" with %u ECs - assuming %s\n",

  526.                        nb_essence_containers,

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

  528. 

  529.             mxf->op = op;

  530.         } else

  531.             mxf->op = OPAtom;

  532.     } else {

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

  534.         mxf->op = OP1a;

  535.     }

  536. 

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

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

  539. 

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

  541.             partition->kag_size = 512;

  542.         else

  543.             partition->kag_size = 1;

  544. 

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

  546.     }

  547. 

  548.     return 0;

  549. }

  550. 

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

  552. {

  553.     int err;

  554. 

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

  556.         return AVERROR(ENOMEM);

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

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

  559.         mxf->metadata_sets_count = 0;

  560.         return err;

  561.     }

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

  563.     mxf->metadata_sets_count++;

  564.     return 0;

  565. }

  566. 

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

  568. {

  569.     MXFCryptoContext *cryptocontext = arg;

  570.     if (size != 16)

  571.         return AVERROR_INVALIDDATA;

  572.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  574.     return 0;

  575. }

  576. 

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

  578. {

  579.     MXFContext *mxf = arg;

  580.     switch (tag) {

  581.     case 0x1901:

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

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

  584.             return AVERROR_INVALIDDATA;

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

  586.         if (!mxf->packages_refs)

  587.             return AVERROR(ENOMEM);

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

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

  590.         break;

  591.     }

  592.     return 0;

  593. }

  594. 

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

  596. {

  597.     MXFStructuralComponent *source_clip = arg;

  598.     switch(tag) {

  599.     case 0x0202:

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

  601.         break;

  602.     case 0x1201:

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

  604.         break;

  605.     case 0x1101:

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

  607.         avio_skip(pb, 16);

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

  609.         break;

  610.     case 0x1102:

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

  612.         break;

  613.     }

  614.     return 0;

  615. }

  616. 

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

  618. {

  619.     MXFPackage *package = arg;

  620.     switch(tag) {

  621.     case 0x4403:

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

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

  624.             return AVERROR_INVALIDDATA;

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

  626.         if (!package->tracks_refs)

  627.             return AVERROR(ENOMEM);

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

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

  630.         break;

  631.     }

  632.     return 0;

  633. }

  634. 

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

  636. {

  637.     MXFTrack *track = arg;

  638.     switch(tag) {

  639.     case 0x4801:

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

  641.         break;

  642.     case 0x4804:

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

  644.         break;

  645.     case 0x4B01:

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

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

  648.         break;

  649.     case 0x4803:

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

  651.         break;

  652.     }

  653.     return 0;

  654. }

  655. 

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

  657. {

  658.     MXFSequence *sequence = arg;

  659.     switch(tag) {

  660.     case 0x0202:

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

  662.         break;

  663.     case 0x0201:

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

  665.         break;

  666.     case 0x1001:

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

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

  669.             return AVERROR_INVALIDDATA;

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

  671.         if (!sequence->structural_components_refs)

  672.             return AVERROR(ENOMEM);

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

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

  675.         break;

  676.     }

  677.     return 0;

  678. }

  679. 

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

  681. {

  682.     MXFPackage *package = arg;

  683.     switch(tag) {

  684.     case 0x4403:

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

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

  687.             return AVERROR_INVALIDDATA;

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

  689.         if (!package->tracks_refs)

  690.             return AVERROR(ENOMEM);

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

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

  693.         break;

  694.     case 0x4401:

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

  696.         avio_skip(pb, 16);

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

  698.         break;

  699.     case 0x4701:

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

  701.         break;

  702.     }

  703.     return 0;

  704. }

  705. 

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

  707. {

  708.     int i, length;

  709. 

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

  711.     if (!segment->nb_index_entries)

  712.         return 0;

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

  714.              segment->nb_index_entries >

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

  716.         return AVERROR(ENOMEM);

  717. 

  718.     length = avio_rb32(pb);

  719. 

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

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

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

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

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

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

  726. 

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

  728.         !segment->temporal_offset_entries) {

  729.         av_freep(&segment->flag_entries);

  730.         av_freep(&segment->stream_offset_entries);

  731.         av_freep(&segment->temporal_offset_entries);

  732.         return AVERROR(ENOMEM);

  733.     }

  734. 

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

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

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

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

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

  740.         avio_skip(pb, length - 11);

  741.     }

  742.     return 0;

  743. }

  744. 

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

  746. {

  747.     MXFIndexTableSegment *segment = arg;

  748.     switch(tag) {

  749.     case 0x3F05:

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

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

  752.         break;

  753.     case 0x3F06:

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

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

  756.         break;

  757.     case 0x3F07:

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

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

  760.         break;

  761.     case 0x3F0A:

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

  763.         return mxf_read_index_entry_array(pb, segment);

  764.     case 0x3F0B:

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

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

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

  768.                 segment->index_edit_rate.den);

  769.         break;

  770.     case 0x3F0C:

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

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

  773.         break;

  774.     case 0x3F0D:

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

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

  777.         break;

  778.     }

  779.     return 0;

  780. }

  781. 

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

  783. {

  784.     int code, value, ofs = 0;

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

  786. 

  787.     do {

  788.         code = avio_r8(pb);

  789.         value = avio_r8(pb);

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

  791. 

  792.         if (ofs < 16) {

  793.             layout[ofs++] = code;

  794.             layout[ofs++] = value;

  795.         }

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

  797. 

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

  799. }

  800. 

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

  802. {

  803.     MXFDescriptor *descriptor = arg;

  804.     descriptor->pix_fmt = AV_PIX_FMT_NONE;

  805.     switch(tag) {

  806.     case 0x3F01:

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

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

  809.             return AVERROR_INVALIDDATA;

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

  811.         if (!descriptor->sub_descriptors_refs)

  812.             return AVERROR(ENOMEM);

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

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

  815.         break;

  816.     case 0x3004:

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

  818.         break;

  819.     case 0x3006:

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

  821.         break;

  822.     case 0x3201: /* PictureEssenceCoding */

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

  824.         break;

  825.     case 0x3203:

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

  827.         break;

  828.     case 0x3202:

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

  830.         break;

  831.     case 0x320C:

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

  833.         break;

  834.     case 0x320E:

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

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

  837.         break;

  838.     case 0x3301:

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

  840.         break;

  841.     case 0x3302:

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

  843.         break;

  844.     case 0x3308:

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

  846.         break;

  847.     case 0x3D03:

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

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

  850.         break;

  851.     case 0x3D06: /* SoundEssenceCompression */

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

  853.         break;

  854.     case 0x3D07:

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

  856.         break;

  857.     case 0x3D01:

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

  859.         break;

  860.     case 0x3401:

  861.         mxf_read_pixel_layout(pb, descriptor);

  862.         break;

  863.     default:

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

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

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

  867.             if (!descriptor->extradata)

  868.                 return AVERROR(ENOMEM);

  869.             descriptor->extradata_size = size;

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

  871.         }

  872.         break;

  873.     }

  874.     return 0;

  875. }

  876. 

  877. /*

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

  879.  * Returns: boolean

  880.  */

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

  882. {

  883.     int i;

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

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

  886.             return 0;

  887.     }

  888.     return 1;

  889. }

  890. 

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

  892. {

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

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

  895.             break;

  896.         uls++;

  897.     }

  898.     return uls;

  899. }

  900. 

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

  902. {

  903.     int i;

  904. 

  905.     if (!strong_ref)

  906.         return NULL;

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

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

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

  910.             return mxf->metadata_sets[i];

  911.         }

  912.     }

  913.     return NULL;

  914. }

  915. 

  916. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  917.     // video essence container uls

  918.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  919.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  920.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  921.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  922. };

  923. 

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

  925. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  926.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  927.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  928. };

  929. 

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

  931. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  932.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  933.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */

  934.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  935. };

  936. 

  937. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  938.     // sound essence container uls

  939.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  940.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  941.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  942.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  943.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  944. };

  945. 

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

  947. {

  948.     int i, j, nb_segments = 0;

  949.     MXFIndexTableSegment **unsorted_segments;

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

  951. 

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

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

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

  955.             nb_segments++;

  956. 

  957.     if (!nb_segments)

  958.         return AVERROR_INVALIDDATA;

  959. 

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

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

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

  963.         av_freep(sorted_segments);

  964.         av_free(unsorted_segments);

  965.         return AVERROR(ENOMEM);

  966.     }

  967. 

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

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

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

  971. 

  972.     *nb_sorted_segments = 0;

  973. 

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

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

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

  977. 

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

  979.             MXFIndexTableSegment *s = unsorted_segments[j];

  980. 

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

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

  983.              */

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

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

  986.                 best             = j;

  987.                 best_body_sid    = s->body_sid;

  988.                 best_index_sid   = s->index_sid;

  989.                 best_index_start = s->index_start_position;

  990.             }

  991.         }

  992. 

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

  994.         if (best == -1)

  995.             break;

  996. 

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

  998.         last_body_sid    = best_body_sid;

  999.         last_index_sid   = best_index_sid;

  1000.         last_index_start = best_index_start;

  1001.     }

  1002. 

  1003.     av_free(unsorted_segments);

  1004. 

  1005.     return 0;

  1006. }

  1007. 

  1008. /**

  1009.  * Computes the absolute file offset of the given essence container offset

  1010.  */

  1011. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1012. {

  1013.     int x;

  1014.     int64_t offset_in = offset;     /* for logging */

  1015. 

  1016.     for (x = 0; x < mxf->partitions_count; x++) {

  1017.         MXFPartition *p = &mxf->partitions[x];

  1018. 

  1019.         if (p->body_sid != body_sid)

  1020.             continue;

  1021. 

  1022.         if (offset < p->essence_length || !p->essence_length) {

  1023.             *offset_out = p->essence_offset + offset;

  1024.             return 0;

  1025.         }

  1026. 

  1027.         offset -= p->essence_length;

  1028.     }

  1029. 

  1030.     av_log(mxf->fc, AV_LOG_ERROR,

  1031.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1032.            offset_in, body_sid);

  1033. 

  1034.     return AVERROR_INVALIDDATA;

  1035. }

  1036. 

  1037. /**

  1038.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1039.  */

  1040. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1041. {

  1042.     int x;

  1043.     int64_t ret = 0;

  1044. 

  1045.     for (x = 0; x < mxf->partitions_count; x++) {

  1046.         MXFPartition *p = &mxf->partitions[x];

  1047. 

  1048.         if (p->body_sid != body_sid)

  1049.             continue;

  1050. 

  1051.         if (!p->essence_length)

  1052.             return 0;

  1053. 

  1054.         ret = p->essence_offset + p->essence_length;

  1055.     }

  1056. 

  1057.     return ret;

  1058. }

  1059. 

  1060. /* EditUnit -> absolute offset */

  1061. 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)

  1062. {

  1063.     int i;

  1064.     int64_t offset_temp = 0;

  1065. 

  1066.     for (i = 0; i < index_table->nb_segments; i++) {

  1067.         MXFIndexTableSegment *s = index_table->segments[i];

  1068. 

  1069.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1070. 

  1071.         if (edit_unit < s->index_start_position + s->index_duration) {

  1072.             int64_t index = edit_unit - s->index_start_position;

  1073. 

  1074.             if (s->edit_unit_byte_count)

  1075.                 offset_temp += s->edit_unit_byte_count * index;

  1076.             else if (s->nb_index_entries) {

  1077.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1078.                     index *= 2;     /* Avid index */

  1079. 

  1080.                 if (index < 0 || index >= s->nb_index_entries) {

  1081.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1082.                            index_table->index_sid, s->index_start_position);

  1083.                     return AVERROR_INVALIDDATA;

  1084.                 }

  1085. 

  1086.                 offset_temp = s->stream_offset_entries[index];

  1087.             } else {

  1088.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1089.                        index_table->index_sid, s->index_start_position);

  1090.                 return AVERROR_INVALIDDATA;

  1091.             }

  1092. 

  1093.             if (edit_unit_out)

  1094.                 *edit_unit_out = edit_unit;

  1095. 

  1096.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1097.         } else {

  1098.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1099.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1100.         }

  1101.     }

  1102. 

  1103.     if (nag)

  1104.         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);

  1105. 

  1106.     return AVERROR_INVALIDDATA;

  1107. }

  1108. 

  1109. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1110. {

  1111.     int i, j, x;

  1112.     int8_t max_temporal_offset = -128;

  1113. 

  1114.     /* first compute how many entries we have */

  1115.     for (i = 0; i < index_table->nb_segments; i++) {

  1116.         MXFIndexTableSegment *s = index_table->segments[i];

  1117. 

  1118.         if (!s->nb_index_entries) {

  1119.             index_table->nb_ptses = 0;

  1120.             return 0;                               /* no TemporalOffsets */

  1121.         }

  1122. 

  1123.         index_table->nb_ptses += s->index_duration;

  1124.     }

  1125. 

  1126.     /* paranoid check */

  1127.     if (index_table->nb_ptses <= 0)

  1128.         return 0;

  1129. 

  1130.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1131.         return AVERROR(ENOMEM);

  1132. 

  1133.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1134.                                          sizeof(int64_t));

  1135.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1136.                                          sizeof(AVIndexEntry));

  1137.     if (!index_table->ptses || !index_table->fake_index) {

  1138.         av_freep(&index_table->ptses);

  1139.         return AVERROR(ENOMEM);

  1140.     }

  1141. 

  1142.     /* we may have a few bad TemporalOffsets

  1143.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1144.     for (x = 0; x < index_table->nb_ptses; x++)

  1145.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1146. 

  1147.     /**

  1148.      * We have this:

  1149.      *

  1150.      * x  TemporalOffset

  1151.      * 0:  0

  1152.      * 1:  1

  1153.      * 2:  1

  1154.      * 3: -2

  1155.      * 4:  1

  1156.      * 5:  1

  1157.      * 6: -2

  1158.      *

  1159.      * We want to transform it into this:

  1160.      *

  1161.      * x  DTS PTS

  1162.      * 0: -1   0

  1163.      * 1:  0   3

  1164.      * 2:  1   1

  1165.      * 3:  2   2

  1166.      * 4:  3   6

  1167.      * 5:  4   4

  1168.      * 6:  5   5

  1169.      *

  1170.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1171.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1172.      * The latter makes DTS <= PTS.

  1173.      */

  1174.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1175.         MXFIndexTableSegment *s = index_table->segments[i];

  1176.         int index_delta = 1;

  1177.         int n = s->nb_index_entries;

  1178. 

  1179.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1180.             index_delta = 2;    /* Avid index */

  1181.             /* ignore the last entry - it's the size of the essence container */

  1182.             n--;

  1183.         }

  1184. 

  1185.         for (j = 0; j < n; j += index_delta, x++) {

  1186.             int offset = s->temporal_offset_entries[j] / index_delta;

  1187.             int index  = x + offset;

  1188. 

  1189.             if (x >= index_table->nb_ptses) {

  1190.                 av_log(mxf->fc, AV_LOG_ERROR,

  1191.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1192.                        s->nb_index_entries, s->index_duration);

  1193.                 break;

  1194.             }

  1195. 

  1196.             index_table->fake_index[x].timestamp = x;

  1197.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1198. 

  1199.             if (index < 0 || index >= index_table->nb_ptses) {

  1200.                 av_log(mxf->fc, AV_LOG_ERROR,

  1201.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1202.                        x, offset, index);

  1203.                 continue;

  1204.             }

  1205. 

  1206.             index_table->ptses[index] = x;

  1207.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1208.         }

  1209.     }

  1210. 

  1211.     index_table->first_dts = -max_temporal_offset;

  1212. 

  1213.     return 0;

  1214. }

  1215. 

  1216. /**

  1217.  * Sorts and collects index table segments into index tables.

  1218.  * Also computes PTSes if possible.

  1219.  */

  1220. static int mxf_compute_index_tables(MXFContext *mxf)

  1221. {

  1222.     int i, j, k, ret, nb_sorted_segments;

  1223.     MXFIndexTableSegment **sorted_segments = NULL;

  1224. 

  1225.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1226.         nb_sorted_segments <= 0) {

  1227.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1228.         return 0;

  1229.     }

  1230. 

  1231.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1232.     for (i = 0; i < nb_sorted_segments; i++) {

  1233.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1234.             mxf->nb_index_tables++;

  1235.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1236.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1237.             ret = AVERROR_INVALIDDATA;

  1238.             goto finish_decoding_index;

  1239.         }

  1240.     }

  1241. 

  1242.     if (mxf->nb_index_tables > INT_MAX / sizeof(MXFIndexTable) ||

  1243.         !(mxf->index_tables = av_mallocz(mxf->nb_index_tables *

  1244.                                          sizeof(MXFIndexTable)))) {

  1245.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1246.         ret = AVERROR(ENOMEM);

  1247.         goto finish_decoding_index;

  1248.     }

  1249. 

  1250.     /* distribute sorted segments to index tables */

  1251.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1252.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1253.             /* next IndexSID */

  1254.             j++;

  1255.         }

  1256. 

  1257.         mxf->index_tables[j].nb_segments++;

  1258.     }

  1259. 

  1260.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1261.         MXFIndexTable *t = &mxf->index_tables[j];

  1262. 

  1263.         if (t->nb_segments >

  1264.             (INT_MAX / sizeof(MXFIndexTableSegment *)) ||

  1265.             !(t->segments = av_mallocz(t->nb_segments *

  1266.                                        sizeof(MXFIndexTableSegment*)))) {

  1267.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1268.                    " pointer array\n");

  1269.             ret = AVERROR(ENOMEM);

  1270.             goto finish_decoding_index;

  1271.         }

  1272. 

  1273.         if (sorted_segments[i]->index_start_position)

  1274.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1275.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1276. 

  1277.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1278.         t->index_sid = sorted_segments[i]->index_sid;

  1279.         t->body_sid = sorted_segments[i]->body_sid;

  1280. 

  1281.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1282.             goto finish_decoding_index;

  1283. 

  1284.         /* fix zero IndexDurations */

  1285.         for (k = 0; k < t->nb_segments; k++) {

  1286.             if (t->segments[k]->index_duration)

  1287.                 continue;

  1288. 

  1289.             if (t->nb_segments > 1)

  1290.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1291.                        t->index_sid, k);

  1292. 

  1293.             if (mxf->fc->nb_streams <= 0) {

  1294.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1295.                 break;

  1296.             }

  1297. 

  1298.             /* assume the first stream's duration is reasonable

  1299.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1300.              */

  1301.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1302.             break;

  1303.         }

  1304.     }

  1305. 

  1306.     ret = 0;

  1307. finish_decoding_index:

  1308.     av_free(sorted_segments);

  1309.     return ret;

  1310. }

  1311. 

  1312. static int mxf_is_intra_only(MXFDescriptor *d)

  1313. {

  1314.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1315.                             &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||

  1316.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1317.                             &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;

  1318. }

  1319. 

  1320. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1321. {

  1322.     MXFPackage *material_package = NULL;

  1323.     MXFPackage *temp_package = NULL;

  1324.     int i, j, k, ret;

  1325. 

  1326.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1327.     /* TODO: handle multiple material packages (OP3x) */

  1328.     for (i = 0; i < mxf->packages_count; i++) {

  1329.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1330.         if (material_package) break;

  1331.     }

  1332.     if (!material_package) {

  1333.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1334.         return AVERROR_INVALIDDATA;

  1335.     }

  1336. 

  1337.     for (i = 0; i < material_package->tracks_count; i++) {

  1338.         MXFPackage *source_package = NULL;

  1339.         MXFTrack *material_track = NULL;

  1340.         MXFTrack *source_track = NULL;

  1341.         MXFTrack *temp_track = NULL;

  1342.         MXFDescriptor *descriptor = NULL;

  1343.         MXFStructuralComponent *component = NULL;

  1344.         UID *essence_container_ul = NULL;

  1345.         const MXFCodecUL *codec_ul = NULL;

  1346.         const MXFCodecUL *container_ul = NULL;

  1347.         const MXFCodecUL *pix_fmt_ul = NULL;

  1348.         AVStream *st;

  1349. 

  1350.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1351.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1352.             continue;

  1353.         }

  1354. 

  1355.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1356.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1357.             continue;

  1358.         }

  1359. 

  1360.         /* TODO: handle multiple source clips */

  1361.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1362.             /* TODO: handle timecode component */

  1363.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1364.             if (!component)

  1365.                 continue;

  1366. 

  1367.             for (k = 0; k < mxf->packages_count; k++) {

  1368.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1369.                 if (!temp_package)

  1370.                     continue;

  1371.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1372.                     source_package = temp_package;

  1373.                     break;

  1374.                 }

  1375.             }

  1376.             if (!source_package) {

  1377.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1378.                 break;

  1379.             }

  1380.             for (k = 0; k < source_package->tracks_count; k++) {

  1381.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1382.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1383.                     ret = AVERROR_INVALIDDATA;

  1384.                     goto fail_and_free;

  1385.                 }

  1386.                 if (temp_track->track_id == component->source_track_id) {

  1387.                     source_track = temp_track;

  1388.                     break;

  1389.                 }

  1390.             }

  1391.             if (!source_track) {

  1392.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1393.                 break;

  1394.             }

  1395.         }

  1396.         if (!source_track || !component)

  1397.             continue;

  1398. 

  1399.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1400.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1401.             ret = AVERROR_INVALIDDATA;

  1402.             goto fail_and_free;

  1403.         }

  1404. 

  1405.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1406.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1407.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1408.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1409.             continue;

  1410.         }

  1411. 

  1412.         st = avformat_new_stream(mxf->fc, NULL);

  1413.         if (!st) {

  1414.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1415.             ret = AVERROR(ENOMEM);

  1416.             goto fail_and_free;

  1417.         }

  1418.         st->id = source_track->track_id;

  1419.         st->priv_data = source_track;

  1420.         st->duration = component->duration;

  1421.         if (st->duration == -1)

  1422.             st->duration = AV_NOPTS_VALUE;

  1423.         st->start_time = component->start_position;

  1424.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1425. 

  1426.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1427.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1428.         st->codec->codec_type = codec_ul->id;

  1429. 

  1430.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1431.         if (source_package->descriptor) {

  1432.             if (source_package->descriptor->type == MultipleDescriptor) {

  1433.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1434.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1435. 

  1436.                     if (!sub_descriptor) {

  1437.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1438.                         continue;

  1439.                     }

  1440.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1441.                         descriptor = sub_descriptor;

  1442.                         break;

  1443.                     }

  1444.                 }

  1445.             } else if (source_package->descriptor->type == Descriptor)

  1446.                 descriptor = source_package->descriptor;

  1447.         }

  1448.         if (!descriptor) {

  1449.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1450.             continue;

  1451.         }

  1452.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1453.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1454.         essence_container_ul = &descriptor->essence_container_ul;

  1455.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1456.          * is not allowed according to s429-6, try to find correct information anyway */

  1457.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1458.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1459.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1460.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1461.                 if (metadata->type == CryptoContext) {

  1462.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1463.                     break;

  1464.                 }

  1465.             }

  1466.         }

  1467. 

  1468.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1469.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1470.         st->codec->codec_id = codec_ul->id;

  1471. 

  1472.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1473.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1474.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1475.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1476.                 st->codec->codec_id = container_ul->id;

  1477.             st->codec->width = descriptor->width;

  1478.             /* Field height, not frame height */

  1479.             st->codec->height = descriptor->height;

  1480.             switch (descriptor->frame_layout) {

  1481.                 case SegmentedFrame:

  1482.                     /* This one is a weird layout I don't fully understand. */

  1483.                     av_log(mxf->fc, AV_LOG_INFO,

  1484.                            "SegmentedFrame layout isn't currently supported\n");

  1485.                     break;

  1486.                 case FullFrame:

  1487.                     break;

  1488.                 case OneField:

  1489.                     /* Every other line is stored and needs to be duplicated. */

  1490.                     av_log(mxf->fc, AV_LOG_INFO,

  1491.                            "OneField frame layout isn't currently supported\n");

  1492.                     break;

  1493.                     /* The correct thing to do here is fall through, but by

  1494.                      * breaking we might be able to decode some streams at half

  1495.                      * the vertical resolution, rather than not al all.

  1496.                      * It's also for compatibility with the old behavior. */

  1497.                 case SeparateFields:

  1498.                 case MixedFields:

  1499.                     /* Turn field height into frame height. */

  1500.                     st->codec->height *= 2;

  1501.                 default:

  1502.                     av_log(mxf->fc, AV_LOG_INFO,

  1503.                            "Unknown frame layout type: %d\n",

  1504.                            descriptor->frame_layout);

  1505.             }

  1506.             if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {

  1507.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1508.                 if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1509.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,

  1510.                                                   &descriptor->essence_codec_ul);

  1511.                     st->codec->pix_fmt = pix_fmt_ul->id;

  1512.                     if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1513.                         /* support files created before RP224v10 by defaulting to UYVY422

  1514.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1515.                         if (descriptor->horiz_subsampling == 2 &&

  1516.                             descriptor->vert_subsampling == 1 &&

  1517.                             descriptor->component_depth == 8) {

  1518.                             st->codec->pix_fmt = AV_PIX_FMT_UYVY422;

  1519.                         }

  1520.                     }

  1521.                 }

  1522.             }

  1523.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1524.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1525.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1526.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1527.                 st->codec->codec_id = container_ul->id;

  1528.             st->codec->channels = descriptor->channels;

  1529.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1530. 

  1531.             if (descriptor->sample_rate.den > 0) {

  1532.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1533.                 avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);

  1534.             } else {

  1535.                 av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "

  1536.                        "found for stream #%d, time base forced to 1/48000\n",

  1537.                        descriptor->sample_rate.num, descriptor->sample_rate.den,

  1538.                        st->index);

  1539.                 avpriv_set_pts_info(st, 64, 1, 48000);

  1540.             }

  1541. 

  1542.             /* TODO: implement AV_CODEC_ID_RAWAUDIO */

  1543.             if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {

  1544.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1545.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;

  1546.                 else if (descriptor->bits_per_sample == 32)

  1547.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;

  1548.             } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {

  1549.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1550.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;

  1551.                 else if (descriptor->bits_per_sample == 32)

  1552.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

  1553.             } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {

  1554.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1555.             }

  1556.         }

  1557.         if (descriptor->extradata) {

  1558.             st->codec->extradata = av_mallocz(descriptor->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1559.             if (st->codec->extradata) {

  1560.                 memcpy(st->codec->extradata, descriptor->extradata, descriptor->extradata_size);

  1561.                 st->codec->extradata_size = descriptor->extradata_size;

  1562.             }

  1563.         } else if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1564.             ret = ff_generate_avci_extradata(st);

  1565.             if (ret < 0)

  1566.                 return ret;

  1567.         }

  1568.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1569.             /* TODO: decode timestamps */

  1570.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1571.         }

  1572.     }

  1573. 

  1574.     ret = 0;

  1575. fail_and_free:

  1576.     return ret;

  1577. }

  1578. 

  1579. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1580.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1581.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1582.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1583.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1584.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1585.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1586.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1587.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1588.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1589.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1590.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1591.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1592.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1593.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1594.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1595.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1596.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1597.     { { 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 */

  1598.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1599.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1600.     { { 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 */

  1601.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1602.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1603.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1604.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1605.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1606.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1607.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1608. };

  1609. 

  1610. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1611. {

  1612.     AVIOContext *pb = mxf->fc->pb;

  1613.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1614.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1615. 

  1616.     if (!ctx)

  1617.         return AVERROR(ENOMEM);

  1618.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1619.         int ret;

  1620.         int tag = avio_rb16(pb);

  1621.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1622.         uint64_t next = avio_tell(pb) + size;

  1623.         UID uid = {0};

  1624. 

  1625.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1626.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1627.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1628.             continue;

  1629.         }

  1630.         if (tag > 0x7FFF) { /* dynamic tag */

  1631.             int i;

  1632.             for (i = 0; i < mxf->local_tags_count; i++) {

  1633.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1634.                 if (local_tag == tag) {

  1635.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1636.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1637.                     PRINT_KEY(mxf->fc, "uid", uid);

  1638.                 }

  1639.             }

  1640.         }

  1641.         if (ctx_size && tag == 0x3C0A)

  1642.             avio_read(pb, ctx->uid, 16);

  1643.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1644.             return ret;

  1645. 

  1646.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1647.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1648.         if (avio_tell(pb) > klv_end) {

  1649.             av_log(mxf->fc, AV_LOG_ERROR,

  1650.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1651.                    tag, klv->offset);

  1652.             return AVERROR_INVALIDDATA;

  1653.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1654.             avio_seek(pb, next, SEEK_SET);

  1655.     }

  1656.     if (ctx_size) ctx->type = type;

  1657.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1658. }

  1659. 

  1660. /**

  1661.  * Seeks to the previous partition, if possible

  1662.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1663.  */

  1664. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1665. {

  1666.     AVIOContext *pb = mxf->fc->pb;

  1667. 

  1668.     if (!mxf->current_partition ||

  1669.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1670.         return 0;   /* we've parsed all partitions */

  1671. 

  1672.     /* seek to previous partition */

  1673.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1674.     mxf->current_partition = NULL;

  1675. 

  1676.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1677. 

  1678.     return 1;

  1679. }

  1680. 

  1681. /**

  1682.  * Called when essence is encountered

  1683.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1684.  */

  1685. static int mxf_parse_handle_essence(MXFContext *mxf)

  1686. {

  1687.     AVIOContext *pb = mxf->fc->pb;

  1688.     int64_t ret;

  1689. 

  1690.     if (mxf->parsing_backward) {

  1691.         return mxf_seek_to_previous_partition(mxf);

  1692.     } else {

  1693.         if (!mxf->footer_partition) {

  1694.             av_dlog(mxf->fc, "no footer\n");

  1695.             return 0;

  1696.         }

  1697. 

  1698.         av_dlog(mxf->fc, "seeking to footer\n");

  1699. 

  1700.         /* remember where we were so we don't end up seeking further back than this */

  1701.         mxf->last_forward_tell = avio_tell(pb);

  1702. 

  1703.         if (!pb->seekable) {

  1704.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1705.             return -1;

  1706.         }

  1707. 

  1708.         /* seek to footer partition and parse backward */

  1709.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1710.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1711.                    mxf->run_in + mxf->footer_partition, ret);

  1712.             return ret;

  1713.         }

  1714. 

  1715.         mxf->current_partition = NULL;

  1716.         mxf->parsing_backward = 1;

  1717.     }

  1718. 

  1719.     return 1;

  1720. }

  1721. 

  1722. /**

  1723.  * Called when the next partition or EOF is encountered

  1724.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1725.  */

  1726. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1727. {

  1728.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1729. }

  1730. 

  1731. /**

  1732.  * Figure out the proper offset and length of the essence container

  1733.  * in each partition

  1734.  */

  1735. static void mxf_compute_essence_containers(MXFContext *mxf)

  1736. {

  1737.     int x;

  1738. 

  1739.     /* everything is already correct */

  1740.     if (mxf->op == OPAtom)

  1741.         return;

  1742. 

  1743.     for (x = 0; x < mxf->partitions_count; x++) {

  1744.         MXFPartition *p = &mxf->partitions[x];

  1745. 

  1746.         if (!p->body_sid)

  1747.             continue;       /* BodySID == 0 -> no essence */

  1748. 

  1749.         if (x >= mxf->partitions_count - 1)

  1750.             break;          /* last partition - can't compute length (and we don't need to) */

  1751. 

  1752.         /* essence container spans to the next partition */

  1753.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1754. 

  1755.         if (p->essence_length < 0) {

  1756.             /* next ThisPartition < essence_offset */

  1757.             p->essence_length = 0;

  1758.             av_log(mxf->fc, AV_LOG_ERROR,

  1759.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1760.                    x+1, mxf->partitions[x+1].this_partition);

  1761.         }

  1762.     }

  1763. }

  1764. 

  1765. static int64_t round_to_kag(int64_t position, int kag_size)

  1766. {

  1767.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1768.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1769.     int64_t ret = (position / kag_size) * kag_size;

  1770.     return ret == position ? ret : ret + kag_size;

  1771. }

  1772. 

  1773. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1774.                                                     MXFContext *mxf,

  1775.                                                     KLVPacket *klv)

  1776. {

  1777.     MXFPartition *cur_part = mxf->current_partition;

  1778.     /* for OP1a we compute essence_offset

  1779.      * for OPAtom we point essence_offset after the KL

  1780.      *     (usually op1a_essence_offset + 20 or 25)

  1781.      * TODO: for OP1a we could eliminate this entire if statement, always

  1782.      *       stopping parsing at op1a_essence_offset

  1783.      *       for OPAtom we still need the actual essence_offset though

  1784.      *       (the KL's length can vary)

  1785.      */

  1786.     int64_t op1a_essence_offset =

  1787.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1788.                      cur_part->kag_size) +

  1789.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1790.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1791. 

  1792.     if (mxf->op == OPAtom) {

  1793.         /* point essence_offset to the actual data

  1794.          * OPAtom has all the essence in one big KLV

  1795.          */

  1796.         cur_part->essence_offset = avio_tell(s->pb);

  1797.         cur_part->essence_length = klv->length;

  1798.     } else {

  1799.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1800.          * (C0023S01.mxf)  */

  1801.         cur_part->essence_offset = op1a_essence_offset;

  1802.     }

  1803. }

  1804. 

  1805. static int is_pcm(enum AVCodecID codec_id)

  1806. {

  1807.     /* we only care about "normal" PCM codecs until we get samples */

  1808.     return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;

  1809. }

  1810. 

  1811. /**

  1812.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1813.  * very small (2, 4..). In those cases we should read more than one

  1814.  * sample per call to mxf_read_packet().

  1815.  */

  1816. static void mxf_handle_small_eubc(AVFormatContext *s)

  1817. {

  1818.     MXFContext *mxf = s->priv_data;

  1819. 

  1820.     /* assuming non-OPAtom == frame wrapped

  1821.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1822.     if (mxf->op != OPAtom)

  1823.         return;

  1824. 

  1825.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1826.     if (s->nb_streams != 1                                     ||

  1827.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1828.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1829.         mxf->nb_index_tables != 1                              ||

  1830.         mxf->index_tables[0].nb_segments != 1                  ||

  1831.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1832.         return;

  1833. 

  1834.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1835.     /* TODO: We could compute this from the ratio between the audio

  1836.      *       and video edit rates for 48 kHz NTSC we could use the

  1837.      *       1802-1802-1802-1802-1801 pattern. */

  1838.     mxf->edit_units_per_packet = 1920;

  1839. }

  1840. 

  1841. static int mxf_read_header(AVFormatContext *s)

  1842. {

  1843.     MXFContext *mxf = s->priv_data;

  1844.     KLVPacket klv;

  1845.     int64_t essence_offset = 0;

  1846.     int ret;

  1847. 

  1848.     mxf->last_forward_tell = INT64_MAX;

  1849.     mxf->edit_units_per_packet = 1;

  1850. 

  1851.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1852.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1853.         return AVERROR_INVALIDDATA;

  1854.     }

  1855.     avio_seek(s->pb, -14, SEEK_CUR);

  1856.     mxf->fc = s;

  1857.     mxf->run_in = avio_tell(s->pb);

  1858. 

  1859.     while (!s->pb->eof_reached) {

  1860.         const MXFMetadataReadTableEntry *metadata;

  1861. 

  1862.         if (klv_read_packet(&klv, s->pb) < 0) {

  1863.             /* EOF - seek to previous partition or stop */

  1864.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1865.                 break;

  1866.             else

  1867.                 continue;

  1868.         }

  1869. 

  1870.         PRINT_KEY(s, "read header", klv.key);

  1871.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1872.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1873.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1874.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1875.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1876. 

  1877.             if (!mxf->current_partition) {

  1878.                 av_log(mxf->fc, AV_LOG_ERROR,

  1879.                        "found essence prior to first PartitionPack\n");

  1880.                 return AVERROR_INVALIDDATA;

  1881.             }

  1882. 

  1883.             if (!mxf->current_partition->essence_offset) {

  1884.                 compute_partition_essence_offset(s, mxf, &klv);

  1885.             }

  1886. 

  1887.             if (!essence_offset)

  1888.                 essence_offset = klv.offset;

  1889. 

  1890.             /* seek to footer, previous partition or stop */

  1891.             if (mxf_parse_handle_essence(mxf) <= 0)

  1892.                 break;

  1893.             continue;

  1894.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1895.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1896.             /* next partition pack - keep going, seek to previous partition or stop */

  1897.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1898.                 break;

  1899.             else if (mxf->parsing_backward)

  1900.                 continue;

  1901.             /* we're still parsing forward. proceed to parsing this partition pack */

  1902.         }

  1903. 

  1904.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1905.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1906.                 int res;

  1907.                 if (klv.key[5] == 0x53) {

  1908.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1909.                 } else {

  1910.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1911.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1912. 

  1913.                     /* only seek forward, else this can loop for a long time */

  1914.                     if (avio_tell(s->pb) > next) {

  1915.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1916.                                klv.offset);

  1917.                         return AVERROR_INVALIDDATA;

  1918.                     }

  1919. 

  1920.                     avio_seek(s->pb, next, SEEK_SET);

  1921.                 }

  1922.                 if (res < 0) {

  1923.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1924.                     return res;

  1925.                 }

  1926.                 break;

  1927.             }

  1928.         }

  1929.         if (!metadata->read)

  1930.             avio_skip(s->pb, klv.length);

  1931.     }

  1932.     /* FIXME avoid seek */

  1933.     if (!essence_offset)  {

  1934.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1935.         return AVERROR_INVALIDDATA;

  1936.     }

  1937.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1938. 

  1939.     mxf_compute_essence_containers(mxf);

  1940. 

  1941.     /* we need to do this before computing the index tables

  1942.      * to be able to fill in zero IndexDurations with st->duration */

  1943.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1944.         return ret;

  1945. 

  1946.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1947.         return ret;

  1948. 

  1949.     if (mxf->nb_index_tables > 1) {

  1950.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1951.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1952.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1953.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1954.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1955.         return AVERROR_INVALIDDATA;

  1956.     }

  1957. 

  1958.     mxf_handle_small_eubc(s);

  1959. 

  1960.     return 0;

  1961. }

  1962. 

  1963. /**

  1964.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1965.  * @return next_ofs if OK, <0 on error

  1966.  */

  1967. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  1968. {

  1969.     int64_t last_ofs = -1, next_ofs = -1;

  1970.     MXFIndexTable *t = &mxf->index_tables[0];

  1971. 

  1972.     /* this is called from the OP1a demuxing logic, which means there

  1973.      * may be no index tables */

  1974.     if (mxf->nb_index_tables <= 0)

  1975.         return -1;

  1976. 

  1977.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  1978.      * of current_offset */

  1979.     while (mxf->current_edit_unit >= 0) {

  1980.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  1981.                                           NULL, &next_ofs, 0) < 0)

  1982.             return -1;

  1983. 

  1984.         if (next_ofs <= last_ofs) {

  1985.             /* large next_ofs didn't change or current_edit_unit wrapped

  1986.              * around this fixes the infinite loop on zzuf3.mxf */

  1987.             av_log(mxf->fc, AV_LOG_ERROR,

  1988.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1989.             return -1;

  1990.         }

  1991. 

  1992.         if (next_ofs > current_offset)

  1993.             break;

  1994. 

  1995.         last_ofs = next_ofs;

  1996.         mxf->current_edit_unit++;

  1997.     }

  1998. 

  1999.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  2000.      * may lack IndexEntryArrays */

  2001.     if (mxf->current_edit_unit < 0)

  2002.         return -1;

  2003. 

  2004.     return next_ofs;

  2005. }

  2006. 

  2007. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  2008. {

  2009.     KLVPacket klv;

  2010.     MXFContext *mxf = s->priv_data;

  2011. 

  2012.     while (!s->pb->eof_reached) {

  2013.         if (klv_read_packet(&klv, s->pb) < 0)

  2014.             return -1;

  2015.         PRINT_KEY(s, "read packet", klv.key);

  2016.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2017.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  2018.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  2019.             if (res < 0) {

  2020.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  2021.                 return -1;

  2022.             }

  2023.             return 0;

  2024.         }

  2025.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2026.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2027.             int index = mxf_get_stream_index(s, &klv);

  2028.             int64_t next_ofs, next_klv;

  2029.             AVStream *st;

  2030.             MXFTrack *track;

  2031. 

  2032.             if (index < 0) {

  2033.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  2034.                 goto skip;

  2035.             }

  2036. 

  2037.             st = s->streams[index];

  2038.             track = st->priv_data;

  2039. 

  2040.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2041.                 goto skip;

  2042. 

  2043.             next_klv = avio_tell(s->pb) + klv.length;

  2044.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2045. 

  2046.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2047.                 /* if this check is hit then it's possible OPAtom was treated

  2048.                  * as OP1a truncate the packet since it's probably very large

  2049.                  * (>2 GiB is common) */

  2050.                 avpriv_request_sample(s,

  2051.                                       "OPAtom misinterpreted as OP1a?"

  2052.                                       "KLV for edit unit %i extending into "

  2053.                                       "next edit unit",

  2054.                                       mxf->current_edit_unit);

  2055.                 klv.length = next_ofs - avio_tell(s->pb);

  2056.             }

  2057. 

  2058.             /* check for 8 channels AES3 element */

  2059.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2060.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  2061.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2062.                     return -1;

  2063.                 }

  2064.             } else {

  2065.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  2066.                 if (ret < 0)

  2067.                     return ret;

  2068.             }

  2069.             pkt->stream_index = index;

  2070.             pkt->pos = klv.offset;

  2071. 

  2072.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2073.                 /* mxf->current_edit_unit good - see if we have an

  2074.                  * index table to derive timestamps from */

  2075.                 MXFIndexTable *t = &mxf->index_tables[0];

  2076. 

  2077.                 if (mxf->nb_index_tables >= 1 &&

  2078.                     mxf->current_edit_unit < t->nb_ptses) {

  2079.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2080.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2081.                 } else if (track->intra_only) {

  2082.                     /* intra-only -> PTS = EditUnit.

  2083.                      * let utils.c figure out DTS since it can be

  2084.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2085.                     pkt->pts = mxf->current_edit_unit;

  2086.                 }

  2087.             }

  2088. 

  2089.             /* seek for truncated packets */

  2090.             avio_seek(s->pb, next_klv, SEEK_SET);

  2091. 

  2092.             return 0;

  2093.         } else

  2094.         skip:

  2095.             avio_skip(s->pb, klv.length);

  2096.     }

  2097.     return AVERROR_EOF;

  2098. }

  2099. 

  2100. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2101. {

  2102.     MXFContext *mxf = s->priv_data;

  2103.     int ret, size;

  2104.     int64_t ret64, pos, next_pos;

  2105.     AVStream *st;

  2106.     MXFIndexTable *t;

  2107.     int edit_units;

  2108. 

  2109.     if (mxf->op != OPAtom)

  2110.         return mxf_read_packet_old(s, pkt);

  2111. 

  2112.     /* OPAtom - clip wrapped demuxing */

  2113.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2114.     st = s->streams[0];

  2115.     t = &mxf->index_tables[0];

  2116. 

  2117.     if (mxf->current_edit_unit >= st->duration)

  2118.         return AVERROR_EOF;

  2119. 

  2120.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2121. 

  2122.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2123.         return ret;

  2124. 

  2125.     /* compute size by finding the next edit unit or the end of the essence container

  2126.      * not pretty, but it works */

  2127.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2128.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2129.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2130.         return AVERROR_INVALIDDATA;

  2131.     }

  2132. 

  2133.     if ((size = next_pos - pos) <= 0) {

  2134.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2135.         return AVERROR_INVALIDDATA;

  2136.     }

  2137. 

  2138.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2139.         return ret64;

  2140. 

  2141.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2142.             return ret < 0 ? ret : AVERROR_EOF;

  2143. 

  2144.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2145.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2146.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2147.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2148.     }

  2149. 

  2150.     pkt->stream_index = 0;

  2151.     mxf->current_edit_unit += edit_units;

  2152. 

  2153.     return 0;

  2154. }

  2155. 

  2156. 

  2157. static int mxf_read_close(AVFormatContext *s)

  2158. {

  2159.     MXFContext *mxf = s->priv_data;

  2160.     MXFIndexTableSegment *seg;

  2161.     int i;

  2162. 

  2163.     av_freep(&mxf->packages_refs);

  2164. 

  2165.     for (i = 0; i < s->nb_streams; i++)

  2166.         s->streams[i]->priv_data = NULL;

  2167. 

  2168.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2169.         switch (mxf->metadata_sets[i]->type) {

  2170.         case MultipleDescriptor:

  2171.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2172.             break;

  2173.         case Sequence:

  2174.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2175.             break;

  2176.         case SourcePackage:

  2177.         case MaterialPackage:

  2178.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2179.             break;

  2180.         case IndexTableSegment:

  2181.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2182.             av_freep(&seg->temporal_offset_entries);

  2183.             av_freep(&seg->flag_entries);

  2184.             av_freep(&seg->stream_offset_entries);

  2185.             break;

  2186.         default:

  2187.             break;

  2188.         }

  2189.         av_freep(&mxf->metadata_sets[i]);

  2190.     }

  2191.     av_freep(&mxf->partitions);

  2192.     av_freep(&mxf->metadata_sets);

  2193.     av_freep(&mxf->aesc);

  2194.     av_freep(&mxf->local_tags);

  2195. 

  2196.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2197.         av_freep(&mxf->index_tables[i].segments);

  2198.         av_freep(&mxf->index_tables[i].ptses);

  2199.         av_freep(&mxf->index_tables[i].fake_index);

  2200.     }

  2201.     av_freep(&mxf->index_tables);

  2202. 

  2203.     return 0;

  2204. }

  2205. 

  2206. static int mxf_probe(AVProbeData *p) {

  2207.     uint8_t *bufp = p->buf;

  2208.     uint8_t *end = p->buf + p->buf_size;

  2209. 

  2210.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2211.         return 0;

  2212. 

  2213.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2214.     end -= sizeof(mxf_header_partition_pack_key);

  2215.     for (; bufp < end; bufp++) {

  2216.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2217.             return AVPROBE_SCORE_MAX;

  2218.     }

  2219.     return 0;

  2220. }

  2221. 

  2222. /* rudimentary byte seek */

  2223. /* XXX: use MXF Index */

  2224. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2225. {

  2226.     AVStream *st = s->streams[stream_index];

  2227.     int64_t seconds;

  2228.     MXFContext* mxf = s->priv_data;

  2229.     int64_t seekpos;

  2230.     int ret;

  2231.     MXFIndexTable *t;

  2232. 

  2233.     if (mxf->nb_index_tables <= 0) {

  2234.     if (!s->bit_rate)

  2235.         return AVERROR_INVALIDDATA;

  2236.     if (sample_time < 0)

  2237.         sample_time = 0;

  2238.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2239. 

  2240.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  2241.         return ret;

  2242.     ff_update_cur_dts(s, st, sample_time);

  2243.     mxf->current_edit_unit = sample_time;

  2244.     } else {

  2245.         t = &mxf->index_tables[0];

  2246. 

  2247.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2248.          * this also means we allow seeking before the start */

  2249.         sample_time = FFMAX(sample_time, 0);

  2250. 

  2251.         if (t->fake_index) {

  2252.             /* behave as if we have a proper index */

  2253.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2254.                 return sample_time;

  2255.         } else {

  2256.             /* no IndexEntryArray (one or more CBR segments)

  2257.              * make sure we don't seek past the end */

  2258.             sample_time = FFMIN(sample_time, st->duration - 1);

  2259.         }

  2260. 

  2261.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2262.             return ret;

  2263. 

  2264.         ff_update_cur_dts(s, st, sample_time);

  2265.         mxf->current_edit_unit = sample_time;

  2266.         avio_seek(s->pb, seekpos, SEEK_SET);

  2267.     }

  2268.     return 0;

  2269. }

  2270. 

  2271. AVInputFormat ff_mxf_demuxer = {

  2272.     .name           = "mxf",

  2273.     .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

  2274.     .priv_data_size = sizeof(MXFContext),

  2275.     .read_probe     = mxf_probe,

  2276.     .read_header    = mxf_read_header,

  2277.     .read_packet    = mxf_read_packet,

  2278.     .read_close     = mxf_read_close,

  2279.     .read_seek      = mxf_read_seek,

  2280. };