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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. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

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

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124.     int intra_only;

  125. } MXFTrack;

  126. 

  127. typedef struct {

  128.     UID uid;

  129.     enum MXFMetadataSetType type;

  130.     UID essence_container_ul;

  131.     UID essence_codec_ul;

  132.     AVRational sample_rate;

  133.     AVRational aspect_ratio;

  134.     int width;

  135.     int height; /* 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 PixelFormat 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_malloc(av_aes_size);

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

  400.                               item_len);

  401.         return AVERROR_PATCHWELCOME;

  402.     }

  403.     if (item_num > UINT_MAX / item_len)

  404.         return AVERROR_INVALIDDATA;

  405.     mxf->local_tags_count = item_num;

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

  407.     if (!mxf->local_tags)

  408.         return AVERROR(ENOMEM);

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

  410.     return 0;

  411. }

  412. 

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

  414. {

  415.     MXFContext *mxf = arg;

  416.     MXFPartition *partition, *tmp_part;

  417.     UID op;

  418.     uint64_t footer_partition;

  419.     uint32_t nb_essence_containers;

  420. 

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

  422.         return AVERROR(ENOMEM);

  423. 

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

  425.     if (!tmp_part)

  426.         return AVERROR(ENOMEM);

  427.     mxf->partitions = tmp_part;

  428. 

  429.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  436.     } else {

  437.         mxf->last_forward_partition++;

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

  439.     }

  440. 

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

  442.     mxf->partitions_count++;

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

  444. 

  445.     switch(uid[13]) {

  446.     case 2:

  447.         partition->type = Header;

  448.         break;

  449.     case 3:

  450.         partition->type = BodyPartition;

  451.         break;

  452.     case 4:

  453.         partition->type = Footer;

  454.         break;

  455.     default:

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

  457.         return AVERROR_INVALIDDATA;

  458.     }

  459. 

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

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

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

  463.     avio_skip(pb, 4);

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

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

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

  467.     footer_partition = avio_rb64(pb);

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

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

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

  471.     avio_skip(pb, 8);

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

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

  474.     nb_essence_containers = avio_rb32(pb);

  475. 

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

  477.     if (footer_partition) {

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

  479.             av_log(mxf->fc, AV_LOG_ERROR,

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

  481.                    mxf->footer_partition, footer_partition);

  482.         } else {

  483.             mxf->footer_partition = footer_partition;

  484.         }

  485.     }

  486. 

  487.     av_dlog(mxf->fc,

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

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

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

  491.             partition->this_partition,

  492.             partition->previous_partition, footer_partition,

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

  494. 

  495.     /* sanity check PreviousPartition if set */

  496.     if (partition->previous_partition &&

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

  498.         av_log(mxf->fc, AV_LOG_ERROR,

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

  500.         return AVERROR_INVALIDDATA;

  501.     }

  502. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  516.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  518.         if (nb_essence_containers != 1) {

  519.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  520. 

  521.             /* only nag once */

  522.             if (!mxf->op)

  523.                 av_log(mxf->fc, AV_LOG_WARNING,

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

  525.                        nb_essence_containers,

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

  527. 

  528.             mxf->op = op;

  529.         } else

  530.             mxf->op = OPAtom;

  531.     } else {

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

  533.         mxf->op = OP1a;

  534.     }

  535. 

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

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

  538. 

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

  540.             partition->kag_size = 512;

  541.         else

  542.             partition->kag_size = 1;

  543. 

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

  545.     }

  546. 

  547.     return 0;

  548. }

  549. 

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

  551. {

  552.     MXFMetadataSet **tmp;

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

  554.         return AVERROR(ENOMEM);

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

  556.     if (!tmp)

  557.         return AVERROR(ENOMEM);

  558.     mxf->metadata_sets = tmp;

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

  560.     mxf->metadata_sets_count++;

  561.     return 0;

  562. }

  563. 

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

  565. {

  566.     MXFCryptoContext *cryptocontext = arg;

  567.     if (size != 16)

  568.         return AVERROR_INVALIDDATA;

  569.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  571.     return 0;

  572. }

  573. 

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

  575. {

  576.     MXFContext *mxf = arg;

  577.     switch (tag) {

  578.     case 0x1901:

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

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

  581.             return AVERROR_INVALIDDATA;

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

  583.         if (!mxf->packages_refs)

  584.             return AVERROR(ENOMEM);

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

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

  587.         break;

  588.     }

  589.     return 0;

  590. }

  591. 

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

  593. {

  594.     MXFStructuralComponent *source_clip = arg;

  595.     switch(tag) {

  596.     case 0x0202:

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

  598.         break;

  599.     case 0x1201:

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

  601.         break;

  602.     case 0x1101:

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

  604.         avio_skip(pb, 16);

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

  606.         break;

  607.     case 0x1102:

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

  609.         break;

  610.     }

  611.     return 0;

  612. }

  613. 

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

  615. {

  616.     MXFPackage *package = arg;

  617.     switch(tag) {

  618.     case 0x4403:

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

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

  621.             return AVERROR_INVALIDDATA;

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

  623.         if (!package->tracks_refs)

  624.             return AVERROR(ENOMEM);

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

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

  627.         break;

  628.     }

  629.     return 0;

  630. }

  631. 

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

  633. {

  634.     MXFTrack *track = arg;

  635.     switch(tag) {

  636.     case 0x4801:

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

  638.         break;

  639.     case 0x4804:

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

  641.         break;

  642.     case 0x4B01:

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

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

  645.         break;

  646.     case 0x4803:

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

  648.         break;

  649.     }

  650.     return 0;

  651. }

  652. 

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

  654. {

  655.     MXFSequence *sequence = arg;

  656.     switch(tag) {

  657.     case 0x0202:

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

  659.         break;

  660.     case 0x0201:

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

  662.         break;

  663.     case 0x1001:

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

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

  666.             return AVERROR_INVALIDDATA;

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

  668.         if (!sequence->structural_components_refs)

  669.             return AVERROR(ENOMEM);

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

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

  672.         break;

  673.     }

  674.     return 0;

  675. }

  676. 

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

  678. {

  679.     MXFPackage *package = arg;

  680.     switch(tag) {

  681.     case 0x4403:

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

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

  684.             return AVERROR_INVALIDDATA;

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

  686.         if (!package->tracks_refs)

  687.             return AVERROR(ENOMEM);

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

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

  690.         break;

  691.     case 0x4401:

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

  693.         avio_skip(pb, 16);

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

  695.         break;

  696.     case 0x4701:

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

  698.         break;

  699.     }

  700.     return 0;

  701. }

  702. 

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

  704. {

  705.     int i, length;

  706. 

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

  708.     if (!segment->nb_index_entries)

  709.         return 0;

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

  711.              segment->nb_index_entries >

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

  713.         return AVERROR(ENOMEM);

  714. 

  715.     length = avio_rb32(pb);

  716. 

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

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

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

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

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

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

  723. 

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

  725.         !segment->temporal_offset_entries) {

  726.         av_freep(&segment->flag_entries);

  727.         av_freep(&segment->stream_offset_entries);

  728.         av_freep(&segment->temporal_offset_entries);

  729.         return AVERROR(ENOMEM);

  730.     }

  731. 

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

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

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

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

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

  737.         avio_skip(pb, length - 11);

  738.     }

  739.     return 0;

  740. }

  741. 

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

  743. {

  744.     MXFIndexTableSegment *segment = arg;

  745.     switch(tag) {

  746.     case 0x3F05:

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

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

  749.         break;

  750.     case 0x3F06:

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

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

  753.         break;

  754.     case 0x3F07:

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

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

  757.         break;

  758.     case 0x3F0A:

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

  760.         return mxf_read_index_entry_array(pb, segment);

  761.     case 0x3F0B:

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

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

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

  765.                 segment->index_edit_rate.den);

  766.         break;

  767.     case 0x3F0C:

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

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

  770.         break;

  771.     case 0x3F0D:

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

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

  774.         break;

  775.     }

  776.     return 0;

  777. }

  778. 

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

  780. {

  781.     int code, value, ofs = 0;

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

  783. 

  784.     do {

  785.         code = avio_r8(pb);

  786.         value = avio_r8(pb);

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

  788. 

  789.         if (ofs < 16) {

  790.             layout[ofs++] = code;

  791.             layout[ofs++] = value;

  792.         }

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

  794. 

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

  796. }

  797. 

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

  799. {

  800.     MXFDescriptor *descriptor = arg;

  801.     descriptor->pix_fmt = PIX_FMT_NONE;

  802.     switch(tag) {

  803.     case 0x3F01:

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

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

  806.             return AVERROR_INVALIDDATA;

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

  808.         if (!descriptor->sub_descriptors_refs)

  809.             return AVERROR(ENOMEM);

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

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

  812.         break;

  813.     case 0x3004:

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

  815.         break;

  816.     case 0x3006:

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

  818.         break;

  819.     case 0x3201: /* PictureEssenceCoding */

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

  821.         break;

  822.     case 0x3203:

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

  824.         break;

  825.     case 0x3202:

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

  827.         break;

  828.     case 0x320C:

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

  830.         break;

  831.     case 0x320E:

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

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

  834.         break;

  835.     case 0x3301:

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

  837.         break;

  838.     case 0x3302:

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

  840.         break;

  841.     case 0x3308:

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

  843.         break;

  844.     case 0x3D03:

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

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

  847.         break;

  848.     case 0x3D06: /* SoundEssenceCompression */

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

  850.         break;

  851.     case 0x3D07:

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

  853.         break;

  854.     case 0x3D01:

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

  856.         break;

  857.     case 0x3401:

  858.         mxf_read_pixel_layout(pb, descriptor);

  859.         break;

  860.     default:

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

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

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

  864.             if (!descriptor->extradata)

  865.                 return AVERROR(ENOMEM);

  866.             descriptor->extradata_size = size;

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

  868.         }

  869.         break;

  870.     }

  871.     return 0;

  872. }

  873. 

  874. /*

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

  876.  * Returns: boolean

  877.  */

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

  879. {

  880.     int i;

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

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

  883.             return 0;

  884.     }

  885.     return 1;

  886. }

  887. 

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

  889. {

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

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

  892.             break;

  893.         uls++;

  894.     }

  895.     return uls;

  896. }

  897. 

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

  899. {

  900.     int i;

  901. 

  902.     if (!strong_ref)

  903.         return NULL;

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

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

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

  907.             return mxf->metadata_sets[i];

  908.         }

  909.     }

  910.     return NULL;

  911. }

  912. 

  913. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  914.     // video essence container uls

  915.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  916.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  917.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  918.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  919. };

  920. 

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

  922. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  923.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  924.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  925. };

  926. 

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

  928. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  929.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  930.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  931. };

  932. 

  933. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  934.     // sound essence container uls

  935.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  936.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  937.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  938.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  939.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  940. };

  941. 

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

  943. {

  944.     int i, j, nb_segments = 0;

  945.     MXFIndexTableSegment **unsorted_segments;

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

  947. 

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

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

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

  951.             nb_segments++;

  952. 

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

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

  955.     if (!sorted_segments || !unsorted_segments) {

  956.         av_freep(sorted_segments);

  957.         av_free(unsorted_segments);

  958.         return AVERROR(ENOMEM);

  959.     }

  960. 

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

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

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

  964. 

  965.     *nb_sorted_segments = 0;

  966. 

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

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

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

  970. 

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

  972.             MXFIndexTableSegment *s = unsorted_segments[j];

  973. 

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

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

  976.              */

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

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

  979.                 best             = j;

  980.                 best_body_sid    = s->body_sid;

  981.                 best_index_sid   = s->index_sid;

  982.                 best_index_start = s->index_start_position;

  983.             }

  984.         }

  985. 

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

  987.         if (best == -1)

  988.             break;

  989. 

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

  991.         last_body_sid    = best_body_sid;

  992.         last_index_sid   = best_index_sid;

  993.         last_index_start = best_index_start;

  994.     }

  995. 

  996.     av_free(unsorted_segments);

  997. 

  998.     return 0;

  999. }

  1000. 

  1001. /**

  1002.  * Computes the absolute file offset of the given essence container offset

  1003.  */

  1004. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1005. {

  1006.     int x;

  1007.     int64_t offset_in = offset;     /* for logging */

  1008. 

  1009.     for (x = 0; x < mxf->partitions_count; x++) {

  1010.         MXFPartition *p = &mxf->partitions[x];

  1011. 

  1012.         if (p->body_sid != body_sid)

  1013.             continue;

  1014. 

  1015.         if (offset < p->essence_length || !p->essence_length) {

  1016.             *offset_out = p->essence_offset + offset;

  1017.             return 0;

  1018.         }

  1019. 

  1020.         offset -= p->essence_length;

  1021.     }

  1022. 

  1023.     av_log(mxf->fc, AV_LOG_ERROR,

  1024.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1025.            offset_in, body_sid);

  1026. 

  1027.     return AVERROR_INVALIDDATA;

  1028. }

  1029. 

  1030. /**

  1031.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1032.  */

  1033. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1034. {

  1035.     int x;

  1036.     int64_t ret = 0;

  1037. 

  1038.     for (x = 0; x < mxf->partitions_count; x++) {

  1039.         MXFPartition *p = &mxf->partitions[x];

  1040. 

  1041.         if (p->body_sid != body_sid)

  1042.             continue;

  1043. 

  1044.         if (!p->essence_length)

  1045.             return 0;

  1046. 

  1047.         ret = p->essence_offset + p->essence_length;

  1048.     }

  1049. 

  1050.     return ret;

  1051. }

  1052. 

  1053. /* EditUnit -> absolute offset */

  1054. 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)

  1055. {

  1056.     int i;

  1057.     int64_t offset_temp = 0;

  1058. 

  1059.     for (i = 0; i < index_table->nb_segments; i++) {

  1060.         MXFIndexTableSegment *s = index_table->segments[i];

  1061. 

  1062.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1063. 

  1064.         if (edit_unit < s->index_start_position + s->index_duration) {

  1065.             int64_t index = edit_unit - s->index_start_position;

  1066. 

  1067.             if (s->edit_unit_byte_count)

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

  1069.             else if (s->nb_index_entries) {

  1070.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1071.                     index *= 2;     /* Avid index */

  1072. 

  1073.                 if (index < 0 || index >= s->nb_index_entries) {

  1074.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1075.                            index_table->index_sid, s->index_start_position);

  1076.                     return AVERROR_INVALIDDATA;

  1077.                 }

  1078. 

  1079.                 offset_temp = s->stream_offset_entries[index];

  1080.             } else {

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

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

  1083.                 return AVERROR_INVALIDDATA;

  1084.             }

  1085. 

  1086.             if (edit_unit_out)

  1087.                 *edit_unit_out = edit_unit;

  1088. 

  1089.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1090.         } else {

  1091.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1092.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1093.         }

  1094.     }

  1095. 

  1096.     if (nag)

  1097.         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);

  1098. 

  1099.     return AVERROR_INVALIDDATA;

  1100. }

  1101. 

  1102. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1103. {

  1104.     int i, j, x;

  1105.     int8_t max_temporal_offset = -128;

  1106. 

  1107.     /* first compute how many entries we have */

  1108.     for (i = 0; i < index_table->nb_segments; i++) {

  1109.         MXFIndexTableSegment *s = index_table->segments[i];

  1110. 

  1111.         if (!s->nb_index_entries) {

  1112.             index_table->nb_ptses = 0;

  1113.             return 0;                               /* no TemporalOffsets */

  1114.         }

  1115. 

  1116.         index_table->nb_ptses += s->index_duration;

  1117.     }

  1118. 

  1119.     /* paranoid check */

  1120.     if (index_table->nb_ptses <= 0)

  1121.         return 0;

  1122. 

  1123.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1124.         return AVERROR(ENOMEM);

  1125. 

  1126.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1127.                                          sizeof(int64_t));

  1128.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1129.                                          sizeof(AVIndexEntry));

  1130.     if (!index_table->ptses || !index_table->fake_index) {

  1131.         av_freep(&index_table->ptses);

  1132.         return AVERROR(ENOMEM);

  1133.     }

  1134. 

  1135.     /* we may have a few bad TemporalOffsets

  1136.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1137.     for (x = 0; x < index_table->nb_ptses; x++)

  1138.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1139. 

  1140.     /**

  1141.      * We have this:

  1142.      *

  1143.      * x  TemporalOffset

  1144.      * 0:  0

  1145.      * 1:  1

  1146.      * 2:  1

  1147.      * 3: -2

  1148.      * 4:  1

  1149.      * 5:  1

  1150.      * 6: -2

  1151.      *

  1152.      * We want to transform it into this:

  1153.      *

  1154.      * x  DTS PTS

  1155.      * 0: -1   0

  1156.      * 1:  0   3

  1157.      * 2:  1   1

  1158.      * 3:  2   2

  1159.      * 4:  3   6

  1160.      * 5:  4   4

  1161.      * 6:  5   5

  1162.      *

  1163.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1164.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1165.      * The latter makes DTS <= PTS.

  1166.      */

  1167.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1168.         MXFIndexTableSegment *s = index_table->segments[i];

  1169.         int index_delta = 1;

  1170.         int n = s->nb_index_entries;

  1171. 

  1172.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1173.             index_delta = 2;    /* Avid index */

  1174.             /* ignore the last entry - it's the size of the essence container */

  1175.             n--;

  1176.         }

  1177. 

  1178.         for (j = 0; j < n; j += index_delta, x++) {

  1179.             int offset = s->temporal_offset_entries[j] / index_delta;

  1180.             int index  = x + offset;

  1181. 

  1182.             if (x >= index_table->nb_ptses) {

  1183.                 av_log(mxf->fc, AV_LOG_ERROR,

  1184.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1185.                        s->nb_index_entries, s->index_duration);

  1186.                 break;

  1187.             }

  1188. 

  1189.             index_table->fake_index[x].timestamp = x;

  1190.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1191. 

  1192.             if (index < 0 || index >= index_table->nb_ptses) {

  1193.                 av_log(mxf->fc, AV_LOG_ERROR,

  1194.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1195.                        x, offset, index);

  1196.                 continue;

  1197.             }

  1198. 

  1199.             index_table->ptses[index] = x;

  1200.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1201.         }

  1202.     }

  1203. 

  1204.     index_table->first_dts = -max_temporal_offset;

  1205. 

  1206.     return 0;

  1207. }

  1208. 

  1209. /**

  1210.  * Sorts and collects index table segments into index tables.

  1211.  * Also computes PTSes if possible.

  1212.  */

  1213. static int mxf_compute_index_tables(MXFContext *mxf)

  1214. {

  1215.     int i, j, k, ret, nb_sorted_segments;

  1216.     MXFIndexTableSegment **sorted_segments = NULL;

  1217. 

  1218.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1219.         nb_sorted_segments <= 0) {

  1220.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1221.         return 0;

  1222.     }

  1223. 

  1224.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1225.     for (i = 0; i < nb_sorted_segments; i++) {

  1226.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1227.             mxf->nb_index_tables++;

  1228.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1229.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1230.             ret = AVERROR_INVALIDDATA;

  1231.             goto finish_decoding_index;

  1232.         }

  1233.     }

  1234. 

  1235.     if (mxf->nb_index_tables > INT_MAX / sizeof(MXFIndexTable) ||

  1236.         !(mxf->index_tables = av_mallocz(mxf->nb_index_tables *

  1237.                                          sizeof(MXFIndexTable)))) {

  1238.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1239.         ret = AVERROR(ENOMEM);

  1240.         goto finish_decoding_index;

  1241.     }

  1242. 

  1243.     /* distribute sorted segments to index tables */

  1244.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1245.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1246.             /* next IndexSID */

  1247.             j++;

  1248.         }

  1249. 

  1250.         mxf->index_tables[j].nb_segments++;

  1251.     }

  1252. 

  1253.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1254.         MXFIndexTable *t = &mxf->index_tables[j];

  1255. 

  1256.         if (t->nb_segments >

  1257.             (INT_MAX / sizeof(MXFIndexTableSegment *)) ||

  1258.             !(t->segments = av_mallocz(t->nb_segments *

  1259.                                        sizeof(MXFIndexTableSegment*)))) {

  1260.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1261.                    " pointer array\n");

  1262.             ret = AVERROR(ENOMEM);

  1263.             goto finish_decoding_index;

  1264.         }

  1265. 

  1266.         if (sorted_segments[i]->index_start_position)

  1267.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1268.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1269. 

  1270.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1271.         t->index_sid = sorted_segments[i]->index_sid;

  1272.         t->body_sid = sorted_segments[i]->body_sid;

  1273. 

  1274.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1275.             goto finish_decoding_index;

  1276. 

  1277.         /* fix zero IndexDurations */

  1278.         for (k = 0; k < t->nb_segments; k++) {

  1279.             if (t->segments[k]->index_duration)

  1280.                 continue;

  1281. 

  1282.             if (t->nb_segments > 1)

  1283.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1284.                        t->index_sid, k);

  1285. 

  1286.             if (mxf->fc->nb_streams <= 0) {

  1287.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1288.                 break;

  1289.             }

  1290. 

  1291.             /* assume the first stream's duration is reasonable

  1292.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1293.              */

  1294.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1295.             break;

  1296.         }

  1297.     }

  1298. 

  1299.     ret = 0;

  1300. finish_decoding_index:

  1301.     av_free(sorted_segments);

  1302.     return ret;

  1303. }

  1304. 

  1305. static int mxf_is_intra_only(MXFDescriptor *d)

  1306. {

  1307.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1308.                             &d->essence_container_ul)->id != CODEC_ID_NONE ||

  1309.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1310.                             &d->essence_codec_ul)->id     != CODEC_ID_NONE;

  1311. }

  1312. 

  1313. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1314. {

  1315.     MXFPackage *material_package = NULL;

  1316.     MXFPackage *temp_package = NULL;

  1317.     int i, j, k, ret;

  1318. 

  1319.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1320.     /* TODO: handle multiple material packages (OP3x) */

  1321.     for (i = 0; i < mxf->packages_count; i++) {

  1322.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1323.         if (material_package) break;

  1324.     }

  1325.     if (!material_package) {

  1326.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1327.         return AVERROR_INVALIDDATA;

  1328.     }

  1329. 

  1330.     for (i = 0; i < material_package->tracks_count; i++) {

  1331.         MXFPackage *source_package = NULL;

  1332.         MXFTrack *material_track = NULL;

  1333.         MXFTrack *source_track = NULL;

  1334.         MXFTrack *temp_track = NULL;

  1335.         MXFDescriptor *descriptor = NULL;

  1336.         MXFStructuralComponent *component = NULL;

  1337.         UID *essence_container_ul = NULL;

  1338.         const MXFCodecUL *codec_ul = NULL;

  1339.         const MXFCodecUL *container_ul = NULL;

  1340.         const MXFCodecUL *pix_fmt_ul = NULL;

  1341.         AVStream *st;

  1342. 

  1343.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1344.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1345.             continue;

  1346.         }

  1347. 

  1348.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1349.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1350.             continue;

  1351.         }

  1352. 

  1353.         /* TODO: handle multiple source clips */

  1354.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1355.             /* TODO: handle timecode component */

  1356.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1357.             if (!component)

  1358.                 continue;

  1359. 

  1360.             for (k = 0; k < mxf->packages_count; k++) {

  1361.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1362.                 if (!temp_package)

  1363.                     continue;

  1364.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1365.                     source_package = temp_package;

  1366.                     break;

  1367.                 }

  1368.             }

  1369.             if (!source_package) {

  1370.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1371.                 break;

  1372.             }

  1373.             for (k = 0; k < source_package->tracks_count; k++) {

  1374.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1375.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1376.                     ret = AVERROR_INVALIDDATA;

  1377.                     goto fail_and_free;

  1378.                 }

  1379.                 if (temp_track->track_id == component->source_track_id) {

  1380.                     source_track = temp_track;

  1381.                     break;

  1382.                 }

  1383.             }

  1384.             if (!source_track) {

  1385.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1386.                 break;

  1387.             }

  1388.         }

  1389.         if (!source_track || !component)

  1390.             continue;

  1391. 

  1392.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1393.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1394.             ret = AVERROR_INVALIDDATA;

  1395.             goto fail_and_free;

  1396.         }

  1397. 

  1398.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1399.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1400.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1401.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1402.             continue;

  1403.         }

  1404. 

  1405.         st = avformat_new_stream(mxf->fc, NULL);

  1406.         if (!st) {

  1407.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1408.             ret = AVERROR(ENOMEM);

  1409.             goto fail_and_free;

  1410.         }

  1411.         st->id = source_track->track_id;

  1412.         st->priv_data = source_track;

  1413.         st->duration = component->duration;

  1414.         if (st->duration == -1)

  1415.             st->duration = AV_NOPTS_VALUE;

  1416.         st->start_time = component->start_position;

  1417.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1418. 

  1419.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1420.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1421.         st->codec->codec_type = codec_ul->id;

  1422. 

  1423.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1424.         if (source_package->descriptor) {

  1425.             if (source_package->descriptor->type == MultipleDescriptor) {

  1426.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1427.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1428. 

  1429.                     if (!sub_descriptor) {

  1430.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1431.                         continue;

  1432.                     }

  1433.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1434.                         descriptor = sub_descriptor;

  1435.                         break;

  1436.                     }

  1437.                 }

  1438.             } else if (source_package->descriptor->type == Descriptor)

  1439.                 descriptor = source_package->descriptor;

  1440.         }

  1441.         if (!descriptor) {

  1442.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1443.             continue;

  1444.         }

  1445.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1446.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1447.         essence_container_ul = &descriptor->essence_container_ul;

  1448.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1449.          * is not allowed according to s429-6, try to find correct information anyway */

  1450.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1451.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1452.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1453.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1454.                 if (metadata->type == CryptoContext) {

  1455.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1456.                     break;

  1457.                 }

  1458.             }

  1459.         }

  1460. 

  1461.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1462.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1463.         st->codec->codec_id = codec_ul->id;

  1464.         if (descriptor->extradata) {

  1465.             st->codec->extradata = descriptor->extradata;

  1466.             st->codec->extradata_size = descriptor->extradata_size;

  1467.         }

  1468.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1469.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1470.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1471.             if (st->codec->codec_id == CODEC_ID_NONE)

  1472.                 st->codec->codec_id = container_ul->id;

  1473.             st->codec->width = descriptor->width;

  1474.             /* Field height, not frame height */

  1475.             st->codec->height = descriptor->height;

  1476.             switch (descriptor->frame_layout) {

  1477.                 case SegmentedFrame:

  1478.                     /* This one is a weird layout I don't fully understand. */

  1479.                     av_log(mxf->fc, AV_LOG_INFO,

  1480.                            "SegmentedFrame layout isn't currently supported\n");

  1481.                     break;

  1482.                 case FullFrame:

  1483.                     break;

  1484.                 case OneField:

  1485.                     /* Every other line is stored and needs to be duplicated. */

  1486.                     av_log(mxf->fc, AV_LOG_INFO,

  1487.                            "OneField frame layout isn't currently supported\n");

  1488.                     break;

  1489.                     /* The correct thing to do here is fall through, but by

  1490.                      * breaking we might be able to decode some streams at half

  1491.                      * the vertical resolution, rather than not al all.

  1492.                      * It's also for compatibility with the old behavior. */

  1493.                 case SeparateFields:

  1494.                 case MixedFields:

  1495.                     /* Turn field height into frame height. */

  1496.                     st->codec->height *= 2;

  1497.                 default:

  1498.                     av_log(mxf->fc, AV_LOG_INFO,

  1499.                            "Unknown frame layout type: %d\n",

  1500.                            descriptor->frame_layout);

  1501.             }

  1502.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO) {

  1503.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1504.                 if (st->codec->pix_fmt == PIX_FMT_NONE) {

  1505.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,

  1506.                                                   &descriptor->essence_codec_ul);

  1507.                     st->codec->pix_fmt = pix_fmt_ul->id;

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

  1509.                         /* support files created before RP224v10 by defaulting to UYVY422

  1510.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1511.                         if (descriptor->horiz_subsampling == 2 &&

  1512.                             descriptor->vert_subsampling == 1 &&

  1513.                             descriptor->component_depth == 8) {

  1514.                             st->codec->pix_fmt = PIX_FMT_UYVY422;

  1515.                         }

  1516.                     }

  1517.                 }

  1518.             }

  1519.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1520.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1521.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1522.             if (st->codec->codec_id == CODEC_ID_NONE)

  1523.                 st->codec->codec_id = container_ul->id;

  1524.             st->codec->channels = descriptor->channels;

  1525.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1526. 

  1527.             if (descriptor->sample_rate.den > 0)

  1528.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1529. 

  1530.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1531.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1532.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1533.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1534.                 else if (descriptor->bits_per_sample == 32)

  1535.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1536.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1537.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1538.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1539.                 else if (descriptor->bits_per_sample == 32)

  1540.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1541.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1542.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1543.             }

  1544.         }

  1545.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1546.             /* TODO: decode timestamps */

  1547.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1548.         }

  1549.     }

  1550. 

  1551.     ret = 0;

  1552. fail_and_free:

  1553.     return ret;

  1554. }

  1555. 

  1556. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1557.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1558.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1559.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1560.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1561.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1562.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1563.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1564.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1565.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1566.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1567.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1568.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1569.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1570.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1571.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1572.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1573.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1574.     { { 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 */

  1575.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1576.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1577.     { { 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 */

  1578.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1579.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1580.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1581.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1582.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1583.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1584.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1585. };

  1586. 

  1587. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1588. {

  1589.     AVIOContext *pb = mxf->fc->pb;

  1590.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1591.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1592. 

  1593.     if (!ctx)

  1594.         return AVERROR(ENOMEM);

  1595.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1596.         int ret;

  1597.         int tag = avio_rb16(pb);

  1598.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1599.         uint64_t next = avio_tell(pb) + size;

  1600.         UID uid = {0};

  1601. 

  1602.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1603.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1604.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1605.             continue;

  1606.         }

  1607.         if (tag > 0x7FFF) { /* dynamic tag */

  1608.             int i;

  1609.             for (i = 0; i < mxf->local_tags_count; i++) {

  1610.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1611.                 if (local_tag == tag) {

  1612.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1613.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1614.                     PRINT_KEY(mxf->fc, "uid", uid);

  1615.                 }

  1616.             }

  1617.         }

  1618.         if (ctx_size && tag == 0x3C0A)

  1619.             avio_read(pb, ctx->uid, 16);

  1620.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1621.             return ret;

  1622. 

  1623.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1624.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1625.         if (avio_tell(pb) > klv_end) {

  1626.             av_log(mxf->fc, AV_LOG_ERROR,

  1627.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1628.                    tag, klv->offset);

  1629.             return AVERROR_INVALIDDATA;

  1630.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1631.             avio_seek(pb, next, SEEK_SET);

  1632.     }

  1633.     if (ctx_size) ctx->type = type;

  1634.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1635. }

  1636. 

  1637. /**

  1638.  * Seeks to the previous partition, if possible

  1639.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1640.  */

  1641. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1642. {

  1643.     AVIOContext *pb = mxf->fc->pb;

  1644. 

  1645.     if (!mxf->current_partition ||

  1646.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1647.         return 0;   /* we've parsed all partitions */

  1648. 

  1649.     /* seek to previous partition */

  1650.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1651.     mxf->current_partition = NULL;

  1652. 

  1653.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1654. 

  1655.     return 1;

  1656. }

  1657. 

  1658. /**

  1659.  * Called when essence is encountered

  1660.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1661.  */

  1662. static int mxf_parse_handle_essence(MXFContext *mxf)

  1663. {

  1664.     AVIOContext *pb = mxf->fc->pb;

  1665.     int64_t ret;

  1666. 

  1667.     if (mxf->parsing_backward) {

  1668.         return mxf_seek_to_previous_partition(mxf);

  1669.     } else {

  1670.         if (!mxf->footer_partition) {

  1671.             av_dlog(mxf->fc, "no footer\n");

  1672.             return 0;

  1673.         }

  1674. 

  1675.         av_dlog(mxf->fc, "seeking to footer\n");

  1676. 

  1677.         /* remember where we were so we don't end up seeking further back than this */

  1678.         mxf->last_forward_tell = avio_tell(pb);

  1679. 

  1680.         if (!pb->seekable) {

  1681.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1682.             return -1;

  1683.         }

  1684. 

  1685.         /* seek to footer partition and parse backward */

  1686.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1687.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1688.                    mxf->run_in + mxf->footer_partition, ret);

  1689.             return ret;

  1690.         }

  1691. 

  1692.         mxf->current_partition = NULL;

  1693.         mxf->parsing_backward = 1;

  1694.     }

  1695. 

  1696.     return 1;

  1697. }

  1698. 

  1699. /**

  1700.  * Called when the next partition or EOF is encountered

  1701.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1702.  */

  1703. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1704. {

  1705.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1706. }

  1707. 

  1708. /**

  1709.  * Figure out the proper offset and length of the essence container

  1710.  * in each partition

  1711.  */

  1712. static void mxf_compute_essence_containers(MXFContext *mxf)

  1713. {

  1714.     int x;

  1715. 

  1716.     /* everything is already correct */

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

  1718.         return;

  1719. 

  1720.     for (x = 0; x < mxf->partitions_count; x++) {

  1721.         MXFPartition *p = &mxf->partitions[x];

  1722. 

  1723.         if (!p->body_sid)

  1724.             continue;       /* BodySID == 0 -> no essence */

  1725. 

  1726.         if (x >= mxf->partitions_count - 1)

  1727.             break;          /* last partition - can't compute length (and we don't need to) */

  1728. 

  1729.         /* essence container spans to the next partition */

  1730.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1731. 

  1732.         if (p->essence_length < 0) {

  1733.             /* next ThisPartition < essence_offset */

  1734.             p->essence_length = 0;

  1735.             av_log(mxf->fc, AV_LOG_ERROR,

  1736.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1737.                    x+1, mxf->partitions[x+1].this_partition);

  1738.         }

  1739.     }

  1740. }

  1741. 

  1742. static int64_t round_to_kag(int64_t position, int kag_size)

  1743. {

  1744.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1745.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1746.     int64_t ret = (position / kag_size) * kag_size;

  1747.     return ret == position ? ret : ret + kag_size;

  1748. }

  1749. 

  1750. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1751.                                                     MXFContext *mxf,

  1752.                                                     KLVPacket *klv)

  1753. {

  1754.     MXFPartition *cur_part = mxf->current_partition;

  1755.     /* for OP1a we compute essence_offset

  1756.      * for OPAtom we point essence_offset after the KL

  1757.      *     (usually op1a_essence_offset + 20 or 25)

  1758.      * TODO: for OP1a we could eliminate this entire if statement, always

  1759.      *       stopping parsing at op1a_essence_offset

  1760.      *       for OPAtom we still need the actual essence_offset though

  1761.      *       (the KL's length can vary)

  1762.      */

  1763.     int64_t op1a_essence_offset =

  1764.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1765.                      cur_part->kag_size) +

  1766.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1767.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1768. 

  1769.     if (mxf->op == OPAtom) {

  1770.         /* point essence_offset to the actual data

  1771.          * OPAtom has all the essence in one big KLV

  1772.          */

  1773.         cur_part->essence_offset = avio_tell(s->pb);

  1774.         cur_part->essence_length = klv->length;

  1775.     } else {

  1776.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1777.          * (C0023S01.mxf)  */

  1778.         cur_part->essence_offset = op1a_essence_offset;

  1779.     }

  1780. }

  1781. 

  1782. static int is_pcm(enum CodecID codec_id)

  1783. {

  1784.     /* we only care about "normal" PCM codecs until we get samples */

  1785.     return codec_id >= CODEC_ID_PCM_S16LE && codec_id < CODEC_ID_PCM_S24DAUD;

  1786. }

  1787. 

  1788. /**

  1789.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1790.  * very small (2, 4..). In those cases we should read more than one

  1791.  * sample per call to mxf_read_packet().

  1792.  */

  1793. static void mxf_handle_small_eubc(AVFormatContext *s)

  1794. {

  1795.     MXFContext *mxf = s->priv_data;

  1796. 

  1797.     /* assuming non-OPAtom == frame wrapped

  1798.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1799.     if (mxf->op != OPAtom)

  1800.         return;

  1801. 

  1802.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1803.     if (s->nb_streams != 1                                     ||

  1804.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1805.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1806.         mxf->nb_index_tables != 1                              ||

  1807.         mxf->index_tables[0].nb_segments != 1                  ||

  1808.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1809.         return;

  1810. 

  1811.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1812.     /* TODO: We could compute this from the ratio between the audio

  1813.      *       and video edit rates for 48 kHz NTSC we could use the

  1814.      *       1802-1802-1802-1802-1801 pattern. */

  1815.     mxf->edit_units_per_packet = 1920;

  1816. }

  1817. 

  1818. static int mxf_read_header(AVFormatContext *s)

  1819. {

  1820.     MXFContext *mxf = s->priv_data;

  1821.     KLVPacket klv;

  1822.     int64_t essence_offset = 0;

  1823.     int ret;

  1824. 

  1825.     mxf->last_forward_tell = INT64_MAX;

  1826.     mxf->edit_units_per_packet = 1;

  1827. 

  1828.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1829.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1830.         return AVERROR_INVALIDDATA;

  1831.     }

  1832.     avio_seek(s->pb, -14, SEEK_CUR);

  1833.     mxf->fc = s;

  1834.     mxf->run_in = avio_tell(s->pb);

  1835. 

  1836.     while (!s->pb->eof_reached) {

  1837.         const MXFMetadataReadTableEntry *metadata;

  1838. 

  1839.         if (klv_read_packet(&klv, s->pb) < 0) {

  1840.             /* EOF - seek to previous partition or stop */

  1841.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1842.                 break;

  1843.             else

  1844.                 continue;

  1845.         }

  1846. 

  1847.         PRINT_KEY(s, "read header", klv.key);

  1848.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1849.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1850.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1851.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1852.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1853. 

  1854.             if (!mxf->current_partition) {

  1855.                 av_log(mxf->fc, AV_LOG_ERROR,

  1856.                        "found essence prior to first PartitionPack\n");

  1857.                 return AVERROR_INVALIDDATA;

  1858.             }

  1859. 

  1860.             if (!mxf->current_partition->essence_offset) {

  1861.                 compute_partition_essence_offset(s, mxf, &klv);

  1862.             }

  1863. 

  1864.             if (!essence_offset)

  1865.                 essence_offset = klv.offset;

  1866. 

  1867.             /* seek to footer, previous partition or stop */

  1868.             if (mxf_parse_handle_essence(mxf) <= 0)

  1869.                 break;

  1870.             continue;

  1871.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1872.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1873.             /* next partition pack - keep going, seek to previous partition or stop */

  1874.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1875.                 break;

  1876.             else if (mxf->parsing_backward)

  1877.                 continue;

  1878.             /* we're still parsing forward. proceed to parsing this partition pack */

  1879.         }

  1880. 

  1881.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1882.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1883.                 int res;

  1884.                 if (klv.key[5] == 0x53) {

  1885.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1886.                 } else {

  1887.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1888.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1889. 

  1890.                     /* only seek forward, else this can loop for a long time */

  1891.                     if (avio_tell(s->pb) > next) {

  1892.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1893.                                klv.offset);

  1894.                         return AVERROR_INVALIDDATA;

  1895.                     }

  1896. 

  1897.                     avio_seek(s->pb, next, SEEK_SET);

  1898.                 }

  1899.                 if (res < 0) {

  1900.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1901.                     return res;

  1902.                 }

  1903.                 break;

  1904.             }

  1905.         }

  1906.         if (!metadata->read)

  1907.             avio_skip(s->pb, klv.length);

  1908.     }

  1909.     /* FIXME avoid seek */

  1910.     if (!essence_offset)  {

  1911.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1912.         return AVERROR_INVALIDDATA;

  1913.     }

  1914.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1915. 

  1916.     mxf_compute_essence_containers(mxf);

  1917. 

  1918.     /* we need to do this before computing the index tables

  1919.      * to be able to fill in zero IndexDurations with st->duration */

  1920.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1921.         return ret;

  1922. 

  1923.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1924.         return ret;

  1925. 

  1926.     if (mxf->nb_index_tables > 1) {

  1927.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1928.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1929.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1930.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1931.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1932.         return AVERROR_INVALIDDATA;

  1933.     }

  1934. 

  1935.     mxf_handle_small_eubc(s);

  1936. 

  1937.     return 0;

  1938. }

  1939. 

  1940. /**

  1941.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1942.  * @return next_ofs if OK, <0 on error

  1943.  */

  1944. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  1945. {

  1946.     int64_t last_ofs = -1, next_ofs = -1;

  1947.     MXFIndexTable *t = &mxf->index_tables[0];

  1948. 

  1949.     /* this is called from the OP1a demuxing logic, which means there

  1950.      * may be no index tables */

  1951.     if (mxf->nb_index_tables <= 0)

  1952.         return -1;

  1953. 

  1954.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  1955.      * of current_offset */

  1956.     while (mxf->current_edit_unit >= 0) {

  1957.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  1958.                                           NULL, &next_ofs, 0) < 0)

  1959.             return -1;

  1960. 

  1961.         if (next_ofs <= last_ofs) {

  1962.             /* large next_ofs didn't change or current_edit_unit wrapped

  1963.              * around this fixes the infinite loop on zzuf3.mxf */

  1964.             av_log(mxf->fc, AV_LOG_ERROR,

  1965.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1966.             return -1;

  1967.         }

  1968. 

  1969.         if (next_ofs > current_offset)

  1970.             break;

  1971. 

  1972.         last_ofs = next_ofs;

  1973.         mxf->current_edit_unit++;

  1974.     }

  1975. 

  1976.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  1977.      * may lack IndexEntryArrays */

  1978.     if (mxf->current_edit_unit < 0)

  1979.         return -1;

  1980. 

  1981.     return next_ofs;

  1982. }

  1983. 

  1984. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1985. {

  1986.     KLVPacket klv;

  1987.     MXFContext *mxf = s->priv_data;

  1988. 

  1989.     while (!s->pb->eof_reached) {

  1990.         if (klv_read_packet(&klv, s->pb) < 0)

  1991.             return -1;

  1992.         PRINT_KEY(s, "read packet", klv.key);

  1993.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1994.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1995.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  1996.             if (res < 0) {

  1997.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1998.                 return -1;

  1999.             }

  2000.             return 0;

  2001.         }

  2002.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2003.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2004.             int index = mxf_get_stream_index(s, &klv);

  2005.             int64_t next_ofs, next_klv;

  2006.             AVStream *st;

  2007.             MXFTrack *track;

  2008. 

  2009.             if (index < 0) {

  2010.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  2011.                 goto skip;

  2012.             }

  2013. 

  2014.             st = s->streams[index];

  2015.             track = st->priv_data;

  2016. 

  2017.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2018.                 goto skip;

  2019. 

  2020.             next_klv = avio_tell(s->pb) + klv.length;

  2021.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2022. 

  2023.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2024.                 /* if this check is hit then it's possible OPAtom was treated

  2025.                  * as OP1a truncate the packet since it's probably very large

  2026.                  * (>2 GiB is common) */

  2027.                 av_log_ask_for_sample(s,

  2028.                                       "KLV for edit unit %i extends into next "

  2029.                                       "edit unit - OPAtom misinterpreted as "

  2030.                                       "OP1a?\n",

  2031.                                       mxf->current_edit_unit);

  2032.                 klv.length = next_ofs - avio_tell(s->pb);

  2033.             }

  2034. 

  2035.             /* check for 8 channels AES3 element */

  2036.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2037.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  2038.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2039.                     return -1;

  2040.                 }

  2041.             } else {

  2042.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  2043.                 if (ret < 0)

  2044.                     return ret;

  2045.             }

  2046.             pkt->stream_index = index;

  2047.             pkt->pos = klv.offset;

  2048. 

  2049.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2050.                 /* mxf->current_edit_unit good - see if we have an

  2051.                  * index table to derive timestamps from */

  2052.                 MXFIndexTable *t = &mxf->index_tables[0];

  2053. 

  2054.                 if (mxf->nb_index_tables >= 1 &&

  2055.                     mxf->current_edit_unit < t->nb_ptses) {

  2056.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2057.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2058.                 } else if (track->intra_only) {

  2059.                     /* intra-only -> PTS = EditUnit.

  2060.                      * let utils.c figure out DTS since it can be

  2061.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2062.                     pkt->pts = mxf->current_edit_unit;

  2063.                 }

  2064.             }

  2065. 

  2066.             /* seek for truncated packets */

  2067.             avio_seek(s->pb, next_klv, SEEK_SET);

  2068. 

  2069.             return 0;

  2070.         } else

  2071.         skip:

  2072.             avio_skip(s->pb, klv.length);

  2073.     }

  2074.     return AVERROR_EOF;

  2075. }

  2076. 

  2077. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2078. {

  2079.     MXFContext *mxf = s->priv_data;

  2080.     int ret, size;

  2081.     int64_t ret64, pos, next_pos;

  2082.     AVStream *st;

  2083.     MXFIndexTable *t;

  2084.     int edit_units;

  2085. 

  2086.     if (mxf->op != OPAtom)

  2087.         return mxf_read_packet_old(s, pkt);

  2088. 

  2089.     /* OPAtom - clip wrapped demuxing */

  2090.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2091.     st = s->streams[0];

  2092.     t = &mxf->index_tables[0];

  2093. 

  2094.     if (mxf->current_edit_unit >= st->duration)

  2095.         return AVERROR_EOF;

  2096. 

  2097.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2098. 

  2099.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2100.         return ret;

  2101. 

  2102.     /* compute size by finding the next edit unit or the end of the essence container

  2103.      * not pretty, but it works */

  2104.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2105.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2106.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2107.         return AVERROR_INVALIDDATA;

  2108.     }

  2109. 

  2110.     if ((size = next_pos - pos) <= 0) {

  2111.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2112.         return AVERROR_INVALIDDATA;

  2113.     }

  2114. 

  2115.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2116.         return ret64;

  2117. 

  2118.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2119.             return ret < 0 ? ret : AVERROR_EOF;

  2120. 

  2121.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2122.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2123.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2124.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2125.     }

  2126. 

  2127.     pkt->stream_index = 0;

  2128.     mxf->current_edit_unit += edit_units;

  2129. 

  2130.     return 0;

  2131. }

  2132. 

  2133. 

  2134. static int mxf_read_close(AVFormatContext *s)

  2135. {

  2136.     MXFContext *mxf = s->priv_data;

  2137.     MXFIndexTableSegment *seg;

  2138.     int i;

  2139. 

  2140.     av_freep(&mxf->packages_refs);

  2141. 

  2142.     for (i = 0; i < s->nb_streams; i++)

  2143.         s->streams[i]->priv_data = NULL;

  2144. 

  2145.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2146.         switch (mxf->metadata_sets[i]->type) {

  2147.         case MultipleDescriptor:

  2148.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2149.             break;

  2150.         case Sequence:

  2151.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2152.             break;

  2153.         case SourcePackage:

  2154.         case MaterialPackage:

  2155.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2156.             break;

  2157.         case IndexTableSegment:

  2158.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2159.             av_freep(&seg->temporal_offset_entries);

  2160.             av_freep(&seg->flag_entries);

  2161.             av_freep(&seg->stream_offset_entries);

  2162.             break;

  2163.         default:

  2164.             break;

  2165.         }

  2166.         av_freep(&mxf->metadata_sets[i]);

  2167.     }

  2168.     av_freep(&mxf->partitions);

  2169.     av_freep(&mxf->metadata_sets);

  2170.     av_freep(&mxf->aesc);

  2171.     av_freep(&mxf->local_tags);

  2172. 

  2173.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2174.         av_freep(&mxf->index_tables[i].segments);

  2175.         av_freep(&mxf->index_tables[i].ptses);

  2176.         av_freep(&mxf->index_tables[i].fake_index);

  2177.     }

  2178.     av_freep(&mxf->index_tables);

  2179. 

  2180.     return 0;

  2181. }

  2182. 

  2183. static int mxf_probe(AVProbeData *p) {

  2184.     uint8_t *bufp = p->buf;

  2185.     uint8_t *end = p->buf + p->buf_size;

  2186. 

  2187.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2188.         return 0;

  2189. 

  2190.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2191.     end -= sizeof(mxf_header_partition_pack_key);

  2192.     for (; bufp < end; bufp++) {

  2193.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2194.             return AVPROBE_SCORE_MAX;

  2195.     }

  2196.     return 0;

  2197. }

  2198. 

  2199. /* rudimentary byte seek */

  2200. /* XXX: use MXF Index */

  2201. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2202. {

  2203.     AVStream *st = s->streams[stream_index];

  2204.     int64_t seconds;

  2205.     MXFContext* mxf = s->priv_data;

  2206.     int64_t seekpos;

  2207.     int ret;

  2208.     MXFIndexTable *t;

  2209. 

  2210.     if (mxf->index_tables <= 0) {

  2211.     if (!s->bit_rate)

  2212.         return AVERROR_INVALIDDATA;

  2213.     if (sample_time < 0)

  2214.         sample_time = 0;

  2215.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2216. 

  2217.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  2218.         return ret;

  2219.     ff_update_cur_dts(s, st, sample_time);

  2220.     } else {

  2221.         t = &mxf->index_tables[0];

  2222. 

  2223.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2224.          * this also means we allow seeking before the start */

  2225.         sample_time = FFMAX(sample_time, 0);

  2226. 

  2227.         if (t->fake_index) {

  2228.             /* behave as if we have a proper index */

  2229.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2230.                 return sample_time;

  2231.         } else {

  2232.             /* no IndexEntryArray (one or more CBR segments)

  2233.              * make sure we don't seek past the end */

  2234.             sample_time = FFMIN(sample_time, st->duration - 1);

  2235.         }

  2236. 

  2237.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2238.             return ret;

  2239. 

  2240.         ff_update_cur_dts(s, st, sample_time);

  2241.         mxf->current_edit_unit = sample_time;

  2242.         avio_seek(s->pb, seekpos, SEEK_SET);

  2243.     }

  2244.     return 0;

  2245. }

  2246. 

  2247. AVInputFormat ff_mxf_demuxer = {

  2248.     .name           = "mxf",

  2249.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  2250.     .priv_data_size = sizeof(MXFContext),

  2251.     .read_probe     = mxf_probe,

  2252.     .read_header    = mxf_read_header,

  2253.     .read_packet    = mxf_read_packet,

  2254.     .read_close     = mxf_read_close,

  2255.     .read_seek      = mxf_read_seek,

  2256. };