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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. #include <stdint.h>

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

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

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124.     int intra_only;

  125. } MXFTrack;

  126. 

  127. typedef struct {

  128.     UID uid;

  129.     enum MXFMetadataSetType type;

  130.     UID essence_container_ul;

  131.     UID essence_codec_ul;

  132.     AVRational sample_rate;

  133.     AVRational aspect_ratio;

  134.     int width;

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

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

  137.     int channels;

  138.     int bits_per_sample;

  139.     unsigned int component_depth;

  140.     unsigned int horiz_subsampling;

  141.     unsigned int vert_subsampling;

  142.     UID *sub_descriptors_refs;

  143.     int sub_descriptors_count;

  144.     int linked_track_id;

  145.     uint8_t *extradata;

  146.     int extradata_size;

  147.     enum AVPixelFormat pix_fmt;

  148. } MXFDescriptor;

  149. 

  150. typedef struct {

  151.     UID uid;

  152.     enum MXFMetadataSetType type;

  153.     int edit_unit_byte_count;

  154.     int index_sid;

  155.     int body_sid;

  156.     AVRational index_edit_rate;

  157.     uint64_t index_start_position;

  158.     uint64_t index_duration;

  159.     int8_t *temporal_offset_entries;

  160.     int *flag_entries;

  161.     uint64_t *stream_offset_entries;

  162.     int nb_index_entries;

  163. } MXFIndexTableSegment;

  164. 

  165. typedef struct {

  166.     UID uid;

  167.     enum MXFMetadataSetType type;

  168.     UID package_uid;

  169.     UID *tracks_refs;

  170.     int tracks_count;

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

  172.     UID descriptor_ref;

  173. } MXFPackage;

  174. 

  175. typedef struct {

  176.     UID uid;

  177.     enum MXFMetadataSetType type;

  178. } MXFMetadataSet;

  179. 

  180. /* decoded index table */

  181. typedef struct {

  182.     int index_sid;

  183.     int body_sid;

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

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

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

  187.     int nb_segments;

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

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

  190. } MXFIndexTable;

  191. 

  192. typedef struct {

  193.     MXFPartition *partitions;

  194.     unsigned partitions_count;

  195.     MXFOP op;

  196.     UID *packages_refs;

  197.     int packages_count;

  198.     MXFMetadataSet **metadata_sets;

  199.     int metadata_sets_count;

  200.     AVFormatContext *fc;

  201.     struct AVAES *aesc;

  202.     uint8_t *local_tags;

  203.     int local_tags_count;

  204.     uint64_t footer_partition;

  205.     KLVPacket current_klv_data;

  206.     int current_klv_index;

  207.     int run_in;

  208.     MXFPartition *current_partition;

  209.     int parsing_backward;

  210.     int64_t last_forward_tell;

  211.     int last_forward_partition;

  212.     int current_edit_unit;

  213.     int nb_index_tables;

  214.     MXFIndexTable *index_tables;

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

  216. } MXFContext;

  217. 

  218. enum MXFWrappingScheme {

  219.     Frame,

  220.     Clip,

  221. };

  222. 

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

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

  225. 

  226. typedef struct {

  227.     const UID key;

  228.     MXFMetadataReadFunc *read;

  229.     int ctx_size;

  230.     enum MXFMetadataSetType type;

  231. } MXFMetadataReadTableEntry;

  232. 

  233. /* partial keys to match */

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

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

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

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

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

  239. /* complete keys to match */

  240. static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };

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

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

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

  244. 

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

  246. 

  247. static int64_t klv_decode_ber_length(AVIOContext *pb)

  248. {

  249.     uint64_t size = avio_r8(pb);

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

  251.         int bytes_num = size & 0x7f;

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

  253.         if (bytes_num > 8)

  254.             return AVERROR_INVALIDDATA;

  255.         size = 0;

  256.         while (bytes_num--)

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

  258.     }

  259.     return size;

  260. }

  261. 

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

  263. {

  264.     int i, b;

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

  266.         b = avio_r8(pb);

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

  268.             i = 0;

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

  270.             i = -1;

  271.     }

  272.     return i == size;

  273. }

  274. 

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

  276. {

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

  278.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  284. }

  285. 

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

  287. {

  288.     int i;

  289. 

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

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

  292.         /* SMPTE 379M 7.3 */

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

  294.             return i;

  295.     }

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

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

  298. }

  299. 

  300. /* XXX: use AVBitStreamFilter */

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

  302. {

  303.     const uint8_t *buf_ptr, *end_ptr;

  304.     uint8_t *data_ptr;

  305.     int i;

  306. 

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

  308.         return AVERROR_INVALIDDATA;

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

  310.     if (length < 0)

  311.         return length;

  312.     data_ptr = pkt->data;

  313.     end_ptr = pkt->data + length;

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

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

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

  317.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  320.             else

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

  322.         }

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

  324.     }

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

  326.     return 0;

  327. }

  328. 

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

  330. {

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

  332.     MXFContext *mxf = s->priv_data;

  333.     AVIOContext *pb = s->pb;

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

  335.     int64_t size;

  336.     uint64_t orig_size;

  337.     uint64_t plaintext_size;

  338.     uint8_t ivec[16];

  339.     uint8_t tmpbuf[16];

  340.     int index;

  341. 

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

  343.         mxf->aesc = av_aes_alloc();

  344.         if (!mxf->aesc)

  345.             return AVERROR(ENOMEM);

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

  347.     }

  348.     // crypto context

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

  350.     // plaintext offset

  351.     klv_decode_ber_length(pb);

  352.     plaintext_size = avio_rb64(pb);

  353.     // source klv key

  354.     klv_decode_ber_length(pb);

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

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

  357.         return AVERROR_INVALIDDATA;

  358.     index = mxf_get_stream_index(s, klv);

  359.     if (index < 0)

  360.         return AVERROR_INVALIDDATA;

  361.     // source size

  362.     klv_decode_ber_length(pb);

  363.     orig_size = avio_rb64(pb);

  364.     if (orig_size < plaintext_size)

  365.         return AVERROR_INVALIDDATA;

  366.     // enc. code

  367.     size = klv_decode_ber_length(pb);

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

  369.         return AVERROR_INVALIDDATA;

  370.     avio_read(pb, ivec, 16);

  371.     avio_read(pb, tmpbuf, 16);

  372.     if (mxf->aesc)

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

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

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

  376.     size -= 32;

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

  378.     if (size < 0)

  379.         return size;

  380.     else if (size < plaintext_size)

  381.         return AVERROR_INVALIDDATA;

  382.     size -= plaintext_size;

  383.     if (mxf->aesc)

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

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

  386.     av_shrink_packet(pkt, orig_size);

  387.     pkt->stream_index = index;

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

  389.     return 0;

  390. }

  391. 

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

  393. {

  394.     MXFContext *mxf = arg;

  395.     int item_num = avio_rb32(pb);

  396.     int item_len = avio_rb32(pb);

  397. 

  398.     if (item_len != 18) {

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

  400.         return AVERROR_PATCHWELCOME;

  401.     }

  402.     if (item_num > UINT_MAX / item_len)

  403.         return AVERROR_INVALIDDATA;

  404.     mxf->local_tags_count = item_num;

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

  406.     if (!mxf->local_tags)

  407.         return AVERROR(ENOMEM);

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

  409.     return 0;

  410. }

  411. 

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

  413. {

  414.     MXFContext *mxf = arg;

  415.     MXFPartition *partition;

  416.     UID op;

  417.     uint64_t footer_partition;

  418.     uint32_t nb_essence_containers;

  419.     int err;

  420. 

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

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

  423.         mxf->partitions_count = 0;

  424.         return err;

  425.     }

  426. 

  427.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  434.     } else {

  435.         mxf->last_forward_partition++;

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

  437.     }

  438. 

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

  440.     mxf->partitions_count++;

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

  442. 

  443.     switch(uid[13]) {

  444.     case 2:

  445.         partition->type = Header;

  446.         break;

  447.     case 3:

  448.         partition->type = BodyPartition;

  449.         break;

  450.     case 4:

  451.         partition->type = Footer;

  452.         break;

  453.     default:

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

  455.         return AVERROR_INVALIDDATA;

  456.     }

  457. 

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

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

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

  461.     avio_skip(pb, 4);

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

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

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

  465.     footer_partition = avio_rb64(pb);

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

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

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

  469.     avio_skip(pb, 8);

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

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

  472.     nb_essence_containers = avio_rb32(pb);

  473. 

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

  475.     if (footer_partition) {

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

  477.             av_log(mxf->fc, AV_LOG_ERROR,

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

  479.                    mxf->footer_partition, footer_partition);

  480.         } else {

  481.             mxf->footer_partition = footer_partition;

  482.         }

  483.     }

  484. 

  485.     av_dlog(mxf->fc,

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

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

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

  489.             partition->this_partition,

  490.             partition->previous_partition, footer_partition,

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

  492. 

  493.     /* sanity check PreviousPartition if set */

  494.     if (partition->previous_partition &&

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

  496.         av_log(mxf->fc, AV_LOG_ERROR,

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

  498.         return AVERROR_INVALIDDATA;

  499.     }

  500. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  514.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  516.         if (nb_essence_containers != 1) {

  517.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  518. 

  519.             /* only nag once */

  520.             if (!mxf->op)

  521.                 av_log(mxf->fc, AV_LOG_WARNING,

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

  523.                        nb_essence_containers,

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

  525. 

  526.             mxf->op = op;

  527.         } else

  528.             mxf->op = OPAtom;

  529.     } else {

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

  531.         mxf->op = OP1a;

  532.     }

  533. 

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

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

  536. 

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

  538.             partition->kag_size = 512;

  539.         else

  540.             partition->kag_size = 1;

  541. 

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

  543.     }

  544. 

  545.     return 0;

  546. }

  547. 

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

  549. {

  550.     int err;

  551. 

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

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

  554.         mxf->metadata_sets_count = 0;

  555.         return err;

  556.     }

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

  558.     mxf->metadata_sets_count++;

  559.     return 0;

  560. }

  561. 

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

  563. {

  564.     MXFCryptoContext *cryptocontext = arg;

  565.     if (size != 16)

  566.         return AVERROR_INVALIDDATA;

  567.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  569.     return 0;

  570. }

  571. 

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

  573. {

  574.     MXFContext *mxf = arg;

  575.     switch (tag) {

  576.     case 0x1901:

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

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

  579.             return AVERROR_INVALIDDATA;

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

  581.         if (!mxf->packages_refs)

  582.             return AVERROR(ENOMEM);

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

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

  585.         break;

  586.     }

  587.     return 0;

  588. }

  589. 

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

  591. {

  592.     MXFStructuralComponent *source_clip = arg;

  593.     switch(tag) {

  594.     case 0x0202:

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

  596.         break;

  597.     case 0x1201:

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

  599.         break;

  600.     case 0x1101:

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

  602.         avio_skip(pb, 16);

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

  604.         break;

  605.     case 0x1102:

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

  607.         break;

  608.     }

  609.     return 0;

  610. }

  611. 

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

  613. {

  614.     MXFPackage *package = arg;

  615.     switch(tag) {

  616.     case 0x4403:

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

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

  619.             return AVERROR_INVALIDDATA;

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

  621.         if (!package->tracks_refs)

  622.             return AVERROR(ENOMEM);

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

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

  625.         break;

  626.     }

  627.     return 0;

  628. }

  629. 

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

  631. {

  632.     MXFTrack *track = arg;

  633.     switch(tag) {

  634.     case 0x4801:

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

  636.         break;

  637.     case 0x4804:

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

  639.         break;

  640.     case 0x4B01:

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

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

  643.         break;

  644.     case 0x4803:

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

  646.         break;

  647.     }

  648.     return 0;

  649. }

  650. 

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

  652. {

  653.     MXFSequence *sequence = arg;

  654.     switch(tag) {

  655.     case 0x0202:

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

  657.         break;

  658.     case 0x0201:

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

  660.         break;

  661.     case 0x1001:

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

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

  664.             return AVERROR_INVALIDDATA;

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

  666.         if (!sequence->structural_components_refs)

  667.             return AVERROR(ENOMEM);

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

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

  670.         break;

  671.     }

  672.     return 0;

  673. }

  674. 

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

  676. {

  677.     MXFPackage *package = arg;

  678.     switch(tag) {

  679.     case 0x4403:

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

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

  682.             return AVERROR_INVALIDDATA;

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

  684.         if (!package->tracks_refs)

  685.             return AVERROR(ENOMEM);

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

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

  688.         break;

  689.     case 0x4401:

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

  691.         avio_skip(pb, 16);

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

  693.         break;

  694.     case 0x4701:

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

  696.         break;

  697.     }

  698.     return 0;

  699. }

  700. 

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

  702. {

  703.     int i, length;

  704. 

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

  706.     if (!segment->nb_index_entries)

  707.         return 0;

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

  709.              segment->nb_index_entries >

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

  711.         return AVERROR(ENOMEM);

  712. 

  713.     length = avio_rb32(pb);

  714. 

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

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

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

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

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

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

  721. 

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

  723.         !segment->temporal_offset_entries) {

  724.         av_freep(&segment->flag_entries);

  725.         av_freep(&segment->stream_offset_entries);

  726.         av_freep(&segment->temporal_offset_entries);

  727.         return AVERROR(ENOMEM);

  728.     }

  729. 

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

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

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

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

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

  735.         avio_skip(pb, length - 11);

  736.     }

  737.     return 0;

  738. }

  739. 

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

  741. {

  742.     MXFIndexTableSegment *segment = arg;

  743.     switch(tag) {

  744.     case 0x3F05:

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

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

  747.         break;

  748.     case 0x3F06:

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

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

  751.         break;

  752.     case 0x3F07:

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

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

  755.         break;

  756.     case 0x3F0A:

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

  758.         return mxf_read_index_entry_array(pb, segment);

  759.     case 0x3F0B:

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

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

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

  763.                 segment->index_edit_rate.den);

  764.         break;

  765.     case 0x3F0C:

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

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

  768.         break;

  769.     case 0x3F0D:

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

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

  772.         break;

  773.     }

  774.     return 0;

  775. }

  776. 

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

  778. {

  779.     int code, value, ofs = 0;

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

  781. 

  782.     do {

  783.         code = avio_r8(pb);

  784.         value = avio_r8(pb);

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

  786. 

  787.         if (ofs < 16) {

  788.             layout[ofs++] = code;

  789.             layout[ofs++] = value;

  790.         }

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

  792. 

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

  794. }

  795. 

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

  797. {

  798.     MXFDescriptor *descriptor = arg;

  799.     descriptor->pix_fmt = AV_PIX_FMT_NONE;

  800.     switch(tag) {

  801.     case 0x3F01:

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

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

  804.             return AVERROR_INVALIDDATA;

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

  806.         if (!descriptor->sub_descriptors_refs)

  807.             return AVERROR(ENOMEM);

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

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

  810.         break;

  811.     case 0x3004:

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

  813.         break;

  814.     case 0x3006:

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

  816.         break;

  817.     case 0x3201: /* PictureEssenceCoding */

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

  819.         break;

  820.     case 0x3203:

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

  822.         break;

  823.     case 0x3202:

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

  825.         break;

  826.     case 0x320C:

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

  828.         break;

  829.     case 0x320E:

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

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

  832.         break;

  833.     case 0x3301:

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

  835.         break;

  836.     case 0x3302:

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

  838.         break;

  839.     case 0x3308:

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

  841.         break;

  842.     case 0x3D03:

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

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

  845.         break;

  846.     case 0x3D06: /* SoundEssenceCompression */

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

  848.         break;

  849.     case 0x3D07:

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

  851.         break;

  852.     case 0x3D01:

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

  854.         break;

  855.     case 0x3401:

  856.         mxf_read_pixel_layout(pb, descriptor);

  857.         break;

  858.     default:

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

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

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

  862.             if (!descriptor->extradata)

  863.                 return AVERROR(ENOMEM);

  864.             descriptor->extradata_size = size;

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

  866.         }

  867.         break;

  868.     }

  869.     return 0;

  870. }

  871. 

  872. /*

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

  874.  * Returns: boolean

  875.  */

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

  877. {

  878.     int i;

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

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

  881.             return 0;

  882.     }

  883.     return 1;

  884. }

  885. 

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

  887. {

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

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

  890.             break;

  891.         uls++;

  892.     }

  893.     return uls;

  894. }

  895. 

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

  897. {

  898.     int i;

  899. 

  900.     if (!strong_ref)

  901.         return NULL;

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

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

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

  905.             return mxf->metadata_sets[i];

  906.         }

  907.     }

  908.     return NULL;

  909. }

  910. 

  911. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  912.     // video essence container uls

  913.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  914.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  915.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  916.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  917. };

  918. 

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

  920. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  921.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  922.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  923. };

  924. 

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

  926. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  927.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  928.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */

  929.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  930. };

  931. 

  932. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  933.     // sound essence container uls

  934.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  935.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  936.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  937.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  938.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  939. };

  940. 

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

  942. {

  943.     int i, j, nb_segments = 0;

  944.     MXFIndexTableSegment **unsorted_segments;

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

  946. 

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

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

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

  950.             nb_segments++;

  951. 

  952.     if (!nb_segments)

  953.         return AVERROR_INVALIDDATA;

  954. 

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

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

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

  958.         av_freep(sorted_segments);

  959.         av_free(unsorted_segments);

  960.         return AVERROR(ENOMEM);

  961.     }

  962. 

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

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

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

  966. 

  967.     *nb_sorted_segments = 0;

  968. 

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

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

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

  972. 

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

  974.             MXFIndexTableSegment *s = unsorted_segments[j];

  975. 

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

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

  978.              */

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

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

  981.                 best             = j;

  982.                 best_body_sid    = s->body_sid;

  983.                 best_index_sid   = s->index_sid;

  984.                 best_index_start = s->index_start_position;

  985.             }

  986.         }

  987. 

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

  989.         if (best == -1)

  990.             break;

  991. 

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

  993.         last_body_sid    = best_body_sid;

  994.         last_index_sid   = best_index_sid;

  995.         last_index_start = best_index_start;

  996.     }

  997. 

  998.     av_free(unsorted_segments);

  999. 

  1000.     return 0;

  1001. }

  1002. 

  1003. /**

  1004.  * Computes the absolute file offset of the given essence container offset

  1005.  */

  1006. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1007. {

  1008.     int x;

  1009.     int64_t offset_in = offset;     /* for logging */

  1010. 

  1011.     for (x = 0; x < mxf->partitions_count; x++) {

  1012.         MXFPartition *p = &mxf->partitions[x];

  1013. 

  1014.         if (p->body_sid != body_sid)

  1015.             continue;

  1016. 

  1017.         if (offset < p->essence_length || !p->essence_length) {

  1018.             *offset_out = p->essence_offset + offset;

  1019.             return 0;

  1020.         }

  1021. 

  1022.         offset -= p->essence_length;

  1023.     }

  1024. 

  1025.     av_log(mxf->fc, AV_LOG_ERROR,

  1026.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1027.            offset_in, body_sid);

  1028. 

  1029.     return AVERROR_INVALIDDATA;

  1030. }

  1031. 

  1032. /**

  1033.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1034.  */

  1035. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1036. {

  1037.     int x;

  1038.     int64_t ret = 0;

  1039. 

  1040.     for (x = 0; x < mxf->partitions_count; x++) {

  1041.         MXFPartition *p = &mxf->partitions[x];

  1042. 

  1043.         if (p->body_sid != body_sid)

  1044.             continue;

  1045. 

  1046.         if (!p->essence_length)

  1047.             return 0;

  1048. 

  1049.         ret = p->essence_offset + p->essence_length;

  1050.     }

  1051. 

  1052.     return ret;

  1053. }

  1054. 

  1055. /* EditUnit -> absolute offset */

  1056. 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)

  1057. {

  1058.     int i;

  1059.     int64_t offset_temp = 0;

  1060. 

  1061.     for (i = 0; i < index_table->nb_segments; i++) {

  1062.         MXFIndexTableSegment *s = index_table->segments[i];

  1063. 

  1064.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1065. 

  1066.         if (edit_unit < s->index_start_position + s->index_duration) {

  1067.             int64_t index = edit_unit - s->index_start_position;

  1068. 

  1069.             if (s->edit_unit_byte_count)

  1070.                 offset_temp += s->edit_unit_byte_count * index;

  1071.             else if (s->nb_index_entries) {

  1072.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1073.                     index *= 2;     /* Avid index */

  1074. 

  1075.                 if (index < 0 || index >= s->nb_index_entries) {

  1076.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1077.                            index_table->index_sid, s->index_start_position);

  1078.                     return AVERROR_INVALIDDATA;

  1079.                 }

  1080. 

  1081.                 offset_temp = s->stream_offset_entries[index];

  1082.             } else {

  1083.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1084.                        index_table->index_sid, s->index_start_position);

  1085.                 return AVERROR_INVALIDDATA;

  1086.             }

  1087. 

  1088.             if (edit_unit_out)

  1089.                 *edit_unit_out = edit_unit;

  1090. 

  1091.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1092.         } else {

  1093.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1094.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1095.         }

  1096.     }

  1097. 

  1098.     if (nag)

  1099.         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);

  1100. 

  1101.     return AVERROR_INVALIDDATA;

  1102. }

  1103. 

  1104. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1105. {

  1106.     int i, j, x;

  1107.     int8_t max_temporal_offset = -128;

  1108. 

  1109.     /* first compute how many entries we have */

  1110.     for (i = 0; i < index_table->nb_segments; i++) {

  1111.         MXFIndexTableSegment *s = index_table->segments[i];

  1112. 

  1113.         if (!s->nb_index_entries) {

  1114.             index_table->nb_ptses = 0;

  1115.             return 0;                               /* no TemporalOffsets */

  1116.         }

  1117. 

  1118.         index_table->nb_ptses += s->index_duration;

  1119.     }

  1120. 

  1121.     /* paranoid check */

  1122.     if (index_table->nb_ptses <= 0)

  1123.         return 0;

  1124. 

  1125.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1126.         return AVERROR(ENOMEM);

  1127. 

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

  1129.                                          sizeof(int64_t));

  1130.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1131.                                          sizeof(AVIndexEntry));

  1132.     if (!index_table->ptses || !index_table->fake_index) {

  1133.         av_freep(&index_table->ptses);

  1134.         return AVERROR(ENOMEM);

  1135.     }

  1136. 

  1137.     /* we may have a few bad TemporalOffsets

  1138.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1139.     for (x = 0; x < index_table->nb_ptses; x++)

  1140.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1141. 

  1142.     /**

  1143.      * We have this:

  1144.      *

  1145.      * x  TemporalOffset

  1146.      * 0:  0

  1147.      * 1:  1

  1148.      * 2:  1

  1149.      * 3: -2

  1150.      * 4:  1

  1151.      * 5:  1

  1152.      * 6: -2

  1153.      *

  1154.      * We want to transform it into this:

  1155.      *

  1156.      * x  DTS PTS

  1157.      * 0: -1   0

  1158.      * 1:  0   3

  1159.      * 2:  1   1

  1160.      * 3:  2   2

  1161.      * 4:  3   6

  1162.      * 5:  4   4

  1163.      * 6:  5   5

  1164.      *

  1165.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1166.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1167.      * The latter makes DTS <= PTS.

  1168.      */

  1169.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1170.         MXFIndexTableSegment *s = index_table->segments[i];

  1171.         int index_delta = 1;

  1172.         int n = s->nb_index_entries;

  1173. 

  1174.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1175.             index_delta = 2;    /* Avid index */

  1176.             /* ignore the last entry - it's the size of the essence container */

  1177.             n--;

  1178.         }

  1179. 

  1180.         for (j = 0; j < n; j += index_delta, x++) {

  1181.             int offset = s->temporal_offset_entries[j] / index_delta;

  1182.             int index  = x + offset;

  1183. 

  1184.             if (x >= index_table->nb_ptses) {

  1185.                 av_log(mxf->fc, AV_LOG_ERROR,

  1186.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1187.                        s->nb_index_entries, s->index_duration);

  1188.                 break;

  1189.             }

  1190. 

  1191.             index_table->fake_index[x].timestamp = x;

  1192.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1193. 

  1194.             if (index < 0 || index >= index_table->nb_ptses) {

  1195.                 av_log(mxf->fc, AV_LOG_ERROR,

  1196.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1197.                        x, offset, index);

  1198.                 continue;

  1199.             }

  1200. 

  1201.             index_table->ptses[index] = x;

  1202.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1203.         }

  1204.     }

  1205. 

  1206.     index_table->first_dts = -max_temporal_offset;

  1207. 

  1208.     return 0;

  1209. }

  1210. 

  1211. /**

  1212.  * Sorts and collects index table segments into index tables.

  1213.  * Also computes PTSes if possible.

  1214.  */

  1215. static int mxf_compute_index_tables(MXFContext *mxf)

  1216. {

  1217.     int i, j, k, ret, nb_sorted_segments;

  1218.     MXFIndexTableSegment **sorted_segments = NULL;

  1219. 

  1220.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1221.         nb_sorted_segments <= 0) {

  1222.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1223.         return 0;

  1224.     }

  1225. 

  1226.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1227.     for (i = 0; i < nb_sorted_segments; i++) {

  1228.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1229.             mxf->nb_index_tables++;

  1230.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1231.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1232.             ret = AVERROR_INVALIDDATA;

  1233.             goto finish_decoding_index;

  1234.         }

  1235.     }

  1236. 

  1237.     if (mxf->nb_index_tables > INT_MAX / sizeof(MXFIndexTable) ||

  1238.         !(mxf->index_tables = av_mallocz(mxf->nb_index_tables *

  1239.                                          sizeof(MXFIndexTable)))) {

  1240.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1241.         ret = AVERROR(ENOMEM);

  1242.         goto finish_decoding_index;

  1243.     }

  1244. 

  1245.     /* distribute sorted segments to index tables */

  1246.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1247.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1248.             /* next IndexSID */

  1249.             j++;

  1250.         }

  1251. 

  1252.         mxf->index_tables[j].nb_segments++;

  1253.     }

  1254. 

  1255.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1256.         MXFIndexTable *t = &mxf->index_tables[j];

  1257. 

  1258.         if (t->nb_segments >

  1259.             (INT_MAX / sizeof(MXFIndexTableSegment *)) ||

  1260.             !(t->segments = av_mallocz(t->nb_segments *

  1261.                                        sizeof(MXFIndexTableSegment*)))) {

  1262.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1263.                    " pointer array\n");

  1264.             ret = AVERROR(ENOMEM);

  1265.             goto finish_decoding_index;

  1266.         }

  1267. 

  1268.         if (sorted_segments[i]->index_start_position)

  1269.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1270.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1271. 

  1272.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1273.         t->index_sid = sorted_segments[i]->index_sid;

  1274.         t->body_sid = sorted_segments[i]->body_sid;

  1275. 

  1276.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1277.             goto finish_decoding_index;

  1278. 

  1279.         /* fix zero IndexDurations */

  1280.         for (k = 0; k < t->nb_segments; k++) {

  1281.             if (t->segments[k]->index_duration)

  1282.                 continue;

  1283. 

  1284.             if (t->nb_segments > 1)

  1285.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1286.                        t->index_sid, k);

  1287. 

  1288.             if (mxf->fc->nb_streams <= 0) {

  1289.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1290.                 break;

  1291.             }

  1292. 

  1293.             /* assume the first stream's duration is reasonable

  1294.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1295.              */

  1296.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1297.             break;

  1298.         }

  1299.     }

  1300. 

  1301.     ret = 0;

  1302. finish_decoding_index:

  1303.     av_free(sorted_segments);

  1304.     return ret;

  1305. }

  1306. 

  1307. static int mxf_is_intra_only(MXFDescriptor *d)

  1308. {

  1309.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1310.                             &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||

  1311.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1312.                             &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;

  1313. }

  1314. 

  1315. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1316. {

  1317.     MXFPackage *material_package = NULL;

  1318.     MXFPackage *temp_package = NULL;

  1319.     int i, j, k, ret;

  1320. 

  1321.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1322.     /* TODO: handle multiple material packages (OP3x) */

  1323.     for (i = 0; i < mxf->packages_count; i++) {

  1324.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1325.         if (material_package) break;

  1326.     }

  1327.     if (!material_package) {

  1328.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1329.         return AVERROR_INVALIDDATA;

  1330.     }

  1331. 

  1332.     for (i = 0; i < material_package->tracks_count; i++) {

  1333.         MXFPackage *source_package = NULL;

  1334.         MXFTrack *material_track = NULL;

  1335.         MXFTrack *source_track = NULL;

  1336.         MXFTrack *temp_track = NULL;

  1337.         MXFDescriptor *descriptor = NULL;

  1338.         MXFStructuralComponent *component = NULL;

  1339.         UID *essence_container_ul = NULL;

  1340.         const MXFCodecUL *codec_ul = NULL;

  1341.         const MXFCodecUL *container_ul = NULL;

  1342.         const MXFCodecUL *pix_fmt_ul = NULL;

  1343.         AVStream *st;

  1344. 

  1345.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1346.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1347.             continue;

  1348.         }

  1349. 

  1350.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

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

  1352.             continue;

  1353.         }

  1354. 

  1355.         /* TODO: handle multiple source clips */

  1356.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1357.             /* TODO: handle timecode component */

  1358.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1359.             if (!component)

  1360.                 continue;

  1361. 

  1362.             for (k = 0; k < mxf->packages_count; k++) {

  1363.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1364.                 if (!temp_package)

  1365.                     continue;

  1366.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1367.                     source_package = temp_package;

  1368.                     break;

  1369.                 }

  1370.             }

  1371.             if (!source_package) {

  1372.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1373.                 break;

  1374.             }

  1375.             for (k = 0; k < source_package->tracks_count; k++) {

  1376.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1377.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1378.                     ret = AVERROR_INVALIDDATA;

  1379.                     goto fail_and_free;

  1380.                 }

  1381.                 if (temp_track->track_id == component->source_track_id) {

  1382.                     source_track = temp_track;

  1383.                     break;

  1384.                 }

  1385.             }

  1386.             if (!source_track) {

  1387.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1388.                 break;

  1389.             }

  1390.         }

  1391.         if (!source_track || !component)

  1392.             continue;

  1393. 

  1394.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1395.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1396.             ret = AVERROR_INVALIDDATA;

  1397.             goto fail_and_free;

  1398.         }

  1399. 

  1400.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1401.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1402.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1403.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1404.             continue;

  1405.         }

  1406. 

  1407.         st = avformat_new_stream(mxf->fc, NULL);

  1408.         if (!st) {

  1409.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1410.             ret = AVERROR(ENOMEM);

  1411.             goto fail_and_free;

  1412.         }

  1413.         st->id = source_track->track_id;

  1414.         st->priv_data = source_track;

  1415.         st->duration = component->duration;

  1416.         if (st->duration == -1)

  1417.             st->duration = AV_NOPTS_VALUE;

  1418.         st->start_time = component->start_position;

  1419.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1420. 

  1421.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1422.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1423.         st->codec->codec_type = codec_ul->id;

  1424. 

  1425.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1426.         if (source_package->descriptor) {

  1427.             if (source_package->descriptor->type == MultipleDescriptor) {

  1428.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1429.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1430. 

  1431.                     if (!sub_descriptor) {

  1432.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1433.                         continue;

  1434.                     }

  1435.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1436.                         descriptor = sub_descriptor;

  1437.                         break;

  1438.                     }

  1439.                 }

  1440.             } else if (source_package->descriptor->type == Descriptor)

  1441.                 descriptor = source_package->descriptor;

  1442.         }

  1443.         if (!descriptor) {

  1444.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1445.             continue;

  1446.         }

  1447.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1448.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1449.         essence_container_ul = &descriptor->essence_container_ul;

  1450.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1451.          * is not allowed according to s429-6, try to find correct information anyway */

  1452.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1453.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1454.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1455.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1456.                 if (metadata->type == CryptoContext) {

  1457.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1458.                     break;

  1459.                 }

  1460.             }

  1461.         }

  1462. 

  1463.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1464.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1465.         st->codec->codec_id = codec_ul->id;

  1466. 

  1467.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1468.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1469.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1470.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1471.                 st->codec->codec_id = container_ul->id;

  1472.             st->codec->width = descriptor->width;

  1473.             /* Field height, not frame height */

  1474.             st->codec->height = descriptor->height;

  1475.             switch (descriptor->frame_layout) {

  1476.                 case SegmentedFrame:

  1477.                     /* This one is a weird layout I don't fully understand. */

  1478.                     av_log(mxf->fc, AV_LOG_INFO,

  1479.                            "SegmentedFrame layout isn't currently supported\n");

  1480.                     break;

  1481.                 case FullFrame:

  1482.                     st->codec->field_order = AV_FIELD_PROGRESSIVE;

  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 == AV_CODEC_ID_RAWVIDEO) {

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

  1504.                 if (st->codec->pix_fmt == AV_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 == AV_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 = AV_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 == AV_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.                 avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);

  1530.             } else {

  1531.                 av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "

  1532.                        "found for stream #%d, time base forced to 1/48000\n",

  1533.                        descriptor->sample_rate.num, descriptor->sample_rate.den,

  1534.                        st->index);

  1535.                 avpriv_set_pts_info(st, 64, 1, 48000);

  1536.             }

  1537. 

  1538.             /* TODO: implement AV_CODEC_ID_RAWAUDIO */

  1539.             if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {

  1540.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1541.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;

  1542.                 else if (descriptor->bits_per_sample == 32)

  1543.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;

  1544.             } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {

  1545.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1546.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;

  1547.                 else if (descriptor->bits_per_sample == 32)

  1548.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

  1549.             } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {

  1550.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1551.             }

  1552.         }

  1553.         if (descriptor->extradata) {

  1554.             st->codec->extradata = av_mallocz(descriptor->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1555.             if (st->codec->extradata) {

  1556.                 memcpy(st->codec->extradata, descriptor->extradata, descriptor->extradata_size);

  1557.                 st->codec->extradata_size = descriptor->extradata_size;

  1558.             }

  1559.         } else if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1560.             ret = ff_generate_avci_extradata(st);

  1561.             if (ret < 0)

  1562.                 return ret;

  1563.         }

  1564.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1565.             /* TODO: decode timestamps */

  1566.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1567.         }

  1568.     }

  1569. 

  1570.     ret = 0;

  1571. fail_and_free:

  1572.     return ret;

  1573. }

  1574. 

  1575. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1576.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1577.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1578.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1579.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1580.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1581.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1582.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

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

  1584.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1585.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1586.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1587.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1588.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1589.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1590.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1591.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1592.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1593.     { { 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 */

  1594.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1595.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1596.     { { 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 */

  1597.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1598.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1599.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1600.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1601.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1602.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1603.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1604. };

  1605. 

  1606. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1607. {

  1608.     AVIOContext *pb = mxf->fc->pb;

  1609.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1610.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1611. 

  1612.     if (!ctx)

  1613.         return AVERROR(ENOMEM);

  1614.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1615.         int ret;

  1616.         int tag = avio_rb16(pb);

  1617.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1618.         uint64_t next = avio_tell(pb) + size;

  1619.         UID uid = {0};

  1620. 

  1621.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1622.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1623.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1624.             continue;

  1625.         }

  1626.         if (tag > 0x7FFF) { /* dynamic tag */

  1627.             int i;

  1628.             for (i = 0; i < mxf->local_tags_count; i++) {

  1629.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1630.                 if (local_tag == tag) {

  1631.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1632.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1633.                     PRINT_KEY(mxf->fc, "uid", uid);

  1634.                 }

  1635.             }

  1636.         }

  1637.         if (ctx_size && tag == 0x3C0A)

  1638.             avio_read(pb, ctx->uid, 16);

  1639.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1640.             return ret;

  1641. 

  1642.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1643.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1644.         if (avio_tell(pb) > klv_end) {

  1645.             av_log(mxf->fc, AV_LOG_ERROR,

  1646.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1647.                    tag, klv->offset);

  1648.             return AVERROR_INVALIDDATA;

  1649.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1650.             avio_seek(pb, next, SEEK_SET);

  1651.     }

  1652.     if (ctx_size) ctx->type = type;

  1653.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1654. }

  1655. 

  1656. /**

  1657.  * Seeks to the previous partition, if possible

  1658.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1659.  */

  1660. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1661. {

  1662.     AVIOContext *pb = mxf->fc->pb;

  1663. 

  1664.     if (!mxf->current_partition ||

  1665.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1666.         return 0;   /* we've parsed all partitions */

  1667. 

  1668.     /* seek to previous partition */

  1669.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1670.     mxf->current_partition = NULL;

  1671. 

  1672.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1673. 

  1674.     return 1;

  1675. }

  1676. 

  1677. /**

  1678.  * Called when essence is encountered

  1679.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1680.  */

  1681. static int mxf_parse_handle_essence(MXFContext *mxf)

  1682. {

  1683.     AVIOContext *pb = mxf->fc->pb;

  1684.     int64_t ret;

  1685. 

  1686.     if (mxf->parsing_backward) {

  1687.         return mxf_seek_to_previous_partition(mxf);

  1688.     } else {

  1689.         if (!mxf->footer_partition) {

  1690.             av_dlog(mxf->fc, "no footer\n");

  1691.             return 0;

  1692.         }

  1693. 

  1694.         av_dlog(mxf->fc, "seeking to footer\n");

  1695. 

  1696.         /* remember where we were so we don't end up seeking further back than this */

  1697.         mxf->last_forward_tell = avio_tell(pb);

  1698. 

  1699.         if (!pb->seekable) {

  1700.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1701.             return -1;

  1702.         }

  1703. 

  1704.         /* seek to footer partition and parse backward */

  1705.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1706.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1707.                    mxf->run_in + mxf->footer_partition, ret);

  1708.             return ret;

  1709.         }

  1710. 

  1711.         mxf->current_partition = NULL;

  1712.         mxf->parsing_backward = 1;

  1713.     }

  1714. 

  1715.     return 1;

  1716. }

  1717. 

  1718. /**

  1719.  * Called when the next partition or EOF is encountered

  1720.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1721.  */

  1722. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1723. {

  1724.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1725. }

  1726. 

  1727. /**

  1728.  * Figure out the proper offset and length of the essence container

  1729.  * in each partition

  1730.  */

  1731. static void mxf_compute_essence_containers(MXFContext *mxf)

  1732. {

  1733.     int x;

  1734. 

  1735.     /* everything is already correct */

  1736.     if (mxf->op == OPAtom)

  1737.         return;

  1738. 

  1739.     for (x = 0; x < mxf->partitions_count; x++) {

  1740.         MXFPartition *p = &mxf->partitions[x];

  1741. 

  1742.         if (!p->body_sid)

  1743.             continue;       /* BodySID == 0 -> no essence */

  1744. 

  1745.         if (x >= mxf->partitions_count - 1)

  1746.             break;          /* last partition - can't compute length (and we don't need to) */

  1747. 

  1748.         /* essence container spans to the next partition */

  1749.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1750. 

  1751.         if (p->essence_length < 0) {

  1752.             /* next ThisPartition < essence_offset */

  1753.             p->essence_length = 0;

  1754.             av_log(mxf->fc, AV_LOG_ERROR,

  1755.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1756.                    x+1, mxf->partitions[x+1].this_partition);

  1757.         }

  1758.     }

  1759. }

  1760. 

  1761. static int64_t round_to_kag(int64_t position, int kag_size)

  1762. {

  1763.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1764.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1765.     int64_t ret = (position / kag_size) * kag_size;

  1766.     return ret == position ? ret : ret + kag_size;

  1767. }

  1768. 

  1769. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1770.                                                     MXFContext *mxf,

  1771.                                                     KLVPacket *klv)

  1772. {

  1773.     MXFPartition *cur_part = mxf->current_partition;

  1774.     /* for OP1a we compute essence_offset

  1775.      * for OPAtom we point essence_offset after the KL

  1776.      *     (usually op1a_essence_offset + 20 or 25)

  1777.      * TODO: for OP1a we could eliminate this entire if statement, always

  1778.      *       stopping parsing at op1a_essence_offset

  1779.      *       for OPAtom we still need the actual essence_offset though

  1780.      *       (the KL's length can vary)

  1781.      */

  1782.     int64_t op1a_essence_offset =

  1783.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1784.                      cur_part->kag_size) +

  1785.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1786.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1787. 

  1788.     if (mxf->op == OPAtom) {

  1789.         /* point essence_offset to the actual data

  1790.          * OPAtom has all the essence in one big KLV

  1791.          */

  1792.         cur_part->essence_offset = avio_tell(s->pb);

  1793.         cur_part->essence_length = klv->length;

  1794.     } else {

  1795.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1796.          * (C0023S01.mxf)  */

  1797.         cur_part->essence_offset = op1a_essence_offset;

  1798.     }

  1799. }

  1800. 

  1801. static int is_pcm(enum AVCodecID codec_id)

  1802. {

  1803.     /* we only care about "normal" PCM codecs until we get samples */

  1804.     return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;

  1805. }

  1806. 

  1807. /**

  1808.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1809.  * very small (2, 4..). In those cases we should read more than one

  1810.  * sample per call to mxf_read_packet().

  1811.  */

  1812. static void mxf_handle_small_eubc(AVFormatContext *s)

  1813. {

  1814.     MXFContext *mxf = s->priv_data;

  1815. 

  1816.     /* assuming non-OPAtom == frame wrapped

  1817.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1818.     if (mxf->op != OPAtom)

  1819.         return;

  1820. 

  1821.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1822.     if (s->nb_streams != 1                                     ||

  1823.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1824.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1825.         mxf->nb_index_tables != 1                              ||

  1826.         mxf->index_tables[0].nb_segments != 1                  ||

  1827.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1828.         return;

  1829. 

  1830.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1831.     /* TODO: We could compute this from the ratio between the audio

  1832.      *       and video edit rates for 48 kHz NTSC we could use the

  1833.      *       1802-1802-1802-1802-1801 pattern. */

  1834.     mxf->edit_units_per_packet = 1920;

  1835. }

  1836. 

  1837. static int mxf_read_header(AVFormatContext *s)

  1838. {

  1839.     MXFContext *mxf = s->priv_data;

  1840.     KLVPacket klv;

  1841.     int64_t essence_offset = 0;

  1842.     int ret;

  1843. 

  1844.     mxf->last_forward_tell = INT64_MAX;

  1845.     mxf->edit_units_per_packet = 1;

  1846. 

  1847.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1848.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1849.         return AVERROR_INVALIDDATA;

  1850.     }

  1851.     avio_seek(s->pb, -14, SEEK_CUR);

  1852.     mxf->fc = s;

  1853.     mxf->run_in = avio_tell(s->pb);

  1854. 

  1855.     while (!s->pb->eof_reached) {

  1856.         const MXFMetadataReadTableEntry *metadata;

  1857. 

  1858.         if (klv_read_packet(&klv, s->pb) < 0) {

  1859.             /* EOF - seek to previous partition or stop */

  1860.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1861.                 break;

  1862.             else

  1863.                 continue;

  1864.         }

  1865. 

  1866.         PRINT_KEY(s, "read header", klv.key);

  1867.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1868.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1869.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1870.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1871.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1872. 

  1873.             if (!mxf->current_partition) {

  1874.                 av_log(mxf->fc, AV_LOG_ERROR,

  1875.                        "found essence prior to first PartitionPack\n");

  1876.                 return AVERROR_INVALIDDATA;

  1877.             }

  1878. 

  1879.             if (!mxf->current_partition->essence_offset) {

  1880.                 compute_partition_essence_offset(s, mxf, &klv);

  1881.             }

  1882. 

  1883.             if (!essence_offset)

  1884.                 essence_offset = klv.offset;

  1885. 

  1886.             /* seek to footer, previous partition or stop */

  1887.             if (mxf_parse_handle_essence(mxf) <= 0)

  1888.                 break;

  1889.             continue;

  1890.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1891.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1892.             /* next partition pack - keep going, seek to previous partition or stop */

  1893.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1894.                 break;

  1895.             else if (mxf->parsing_backward)

  1896.                 continue;

  1897.             /* we're still parsing forward. proceed to parsing this partition pack */

  1898.         }

  1899. 

  1900.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1901.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1902.                 int res;

  1903.                 if (klv.key[5] == 0x53) {

  1904.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1905.                 } else {

  1906.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1907.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1908. 

  1909.                     /* only seek forward, else this can loop for a long time */

  1910.                     if (avio_tell(s->pb) > next) {

  1911.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1912.                                klv.offset);

  1913.                         return AVERROR_INVALIDDATA;

  1914.                     }

  1915. 

  1916.                     avio_seek(s->pb, next, SEEK_SET);

  1917.                 }

  1918.                 if (res < 0) {

  1919.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1920.                     return res;

  1921.                 }

  1922.                 break;

  1923.             }

  1924.         }

  1925.         if (!metadata->read)

  1926.             avio_skip(s->pb, klv.length);

  1927.     }

  1928.     /* FIXME avoid seek */

  1929.     if (!essence_offset)  {

  1930.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1931.         return AVERROR_INVALIDDATA;

  1932.     }

  1933.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1934. 

  1935.     mxf_compute_essence_containers(mxf);

  1936. 

  1937.     /* we need to do this before computing the index tables

  1938.      * to be able to fill in zero IndexDurations with st->duration */

  1939.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1940.         return ret;

  1941. 

  1942.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1943.         return ret;

  1944. 

  1945.     if (mxf->nb_index_tables > 1) {

  1946.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1947.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1948.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1949.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1950.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1951.         return AVERROR_INVALIDDATA;

  1952.     }

  1953. 

  1954.     mxf_handle_small_eubc(s);

  1955. 

  1956.     return 0;

  1957. }

  1958. 

  1959. /**

  1960.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1961.  * @return next_ofs if OK, <0 on error

  1962.  */

  1963. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  1964. {

  1965.     int64_t last_ofs = -1, next_ofs = -1;

  1966.     MXFIndexTable *t = &mxf->index_tables[0];

  1967. 

  1968.     /* this is called from the OP1a demuxing logic, which means there

  1969.      * may be no index tables */

  1970.     if (mxf->nb_index_tables <= 0)

  1971.         return -1;

  1972. 

  1973.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  1974.      * of current_offset */

  1975.     while (mxf->current_edit_unit >= 0) {

  1976.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  1977.                                           NULL, &next_ofs, 0) < 0)

  1978.             return -1;

  1979. 

  1980.         if (next_ofs <= last_ofs) {

  1981.             /* large next_ofs didn't change or current_edit_unit wrapped

  1982.              * around this fixes the infinite loop on zzuf3.mxf */

  1983.             av_log(mxf->fc, AV_LOG_ERROR,

  1984.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1985.             return -1;

  1986.         }

  1987. 

  1988.         if (next_ofs > current_offset)

  1989.             break;

  1990. 

  1991.         last_ofs = next_ofs;

  1992.         mxf->current_edit_unit++;

  1993.     }

  1994. 

  1995.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  1996.      * may lack IndexEntryArrays */

  1997.     if (mxf->current_edit_unit < 0)

  1998.         return -1;

  1999. 

  2000.     return next_ofs;

  2001. }

  2002. 

  2003. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  2004. {

  2005.     KLVPacket klv;

  2006.     MXFContext *mxf = s->priv_data;

  2007. 

  2008.     while (!s->pb->eof_reached) {

  2009.         if (klv_read_packet(&klv, s->pb) < 0)

  2010.             return -1;

  2011.         PRINT_KEY(s, "read packet", klv.key);

  2012.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2013.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  2014.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  2015.             if (res < 0) {

  2016.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  2017.                 return -1;

  2018.             }

  2019.             return 0;

  2020.         }

  2021.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2022.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2023.             int index = mxf_get_stream_index(s, &klv);

  2024.             int64_t next_ofs, next_klv;

  2025.             AVStream *st;

  2026.             MXFTrack *track;

  2027. 

  2028.             if (index < 0) {

  2029.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  2030.                 goto skip;

  2031.             }

  2032. 

  2033.             st = s->streams[index];

  2034.             track = st->priv_data;

  2035. 

  2036.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2037.                 goto skip;

  2038. 

  2039.             next_klv = avio_tell(s->pb) + klv.length;

  2040.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2041. 

  2042.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2043.                 /* if this check is hit then it's possible OPAtom was treated

  2044.                  * as OP1a truncate the packet since it's probably very large

  2045.                  * (>2 GiB is common) */

  2046.                 avpriv_request_sample(s,

  2047.                                       "OPAtom misinterpreted as OP1a?"

  2048.                                       "KLV for edit unit %i extending into "

  2049.                                       "next edit unit",

  2050.                                       mxf->current_edit_unit);

  2051.                 klv.length = next_ofs - avio_tell(s->pb);

  2052.             }

  2053. 

  2054.             /* check for 8 channels AES3 element */

  2055.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2056.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  2057.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2058.                     return -1;

  2059.                 }

  2060.             } else {

  2061.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  2062.                 if (ret < 0)

  2063.                     return ret;

  2064.             }

  2065.             pkt->stream_index = index;

  2066.             pkt->pos = klv.offset;

  2067. 

  2068.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2069.                 /* mxf->current_edit_unit good - see if we have an

  2070.                  * index table to derive timestamps from */

  2071.                 MXFIndexTable *t = &mxf->index_tables[0];

  2072. 

  2073.                 if (mxf->nb_index_tables >= 1 &&

  2074.                     mxf->current_edit_unit < t->nb_ptses) {

  2075.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2076.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2077.                 } else if (track->intra_only) {

  2078.                     /* intra-only -> PTS = EditUnit.

  2079.                      * let utils.c figure out DTS since it can be

  2080.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2081.                     pkt->pts = mxf->current_edit_unit;

  2082.                 }

  2083.             }

  2084. 

  2085.             /* seek for truncated packets */

  2086.             avio_seek(s->pb, next_klv, SEEK_SET);

  2087. 

  2088.             return 0;

  2089.         } else

  2090.         skip:

  2091.             avio_skip(s->pb, klv.length);

  2092.     }

  2093.     return AVERROR_EOF;

  2094. }

  2095. 

  2096. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2097. {

  2098.     MXFContext *mxf = s->priv_data;

  2099.     int ret, size;

  2100.     int64_t ret64, pos, next_pos;

  2101.     AVStream *st;

  2102.     MXFIndexTable *t;

  2103.     int edit_units;

  2104. 

  2105.     if (mxf->op != OPAtom)

  2106.         return mxf_read_packet_old(s, pkt);

  2107. 

  2108.     /* OPAtom - clip wrapped demuxing */

  2109.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2110.     st = s->streams[0];

  2111.     t = &mxf->index_tables[0];

  2112. 

  2113.     if (mxf->current_edit_unit >= st->duration)

  2114.         return AVERROR_EOF;

  2115. 

  2116.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2117. 

  2118.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2119.         return ret;

  2120. 

  2121.     /* compute size by finding the next edit unit or the end of the essence container

  2122.      * not pretty, but it works */

  2123.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2124.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2125.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2126.         return AVERROR_INVALIDDATA;

  2127.     }

  2128. 

  2129.     if ((size = next_pos - pos) <= 0) {

  2130.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2131.         return AVERROR_INVALIDDATA;

  2132.     }

  2133. 

  2134.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2135.         return ret64;

  2136. 

  2137.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2138.             return ret < 0 ? ret : AVERROR_EOF;

  2139. 

  2140.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2141.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2142.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2143.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2144.     }

  2145. 

  2146.     pkt->stream_index = 0;

  2147.     mxf->current_edit_unit += edit_units;

  2148. 

  2149.     return 0;

  2150. }

  2151. 

  2152. 

  2153. static int mxf_read_close(AVFormatContext *s)

  2154. {

  2155.     MXFContext *mxf = s->priv_data;

  2156.     MXFIndexTableSegment *seg;

  2157.     int i;

  2158. 

  2159.     av_freep(&mxf->packages_refs);

  2160. 

  2161.     for (i = 0; i < s->nb_streams; i++)

  2162.         s->streams[i]->priv_data = NULL;

  2163. 

  2164.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2165.         switch (mxf->metadata_sets[i]->type) {

  2166.         case MultipleDescriptor:

  2167.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2168.             break;

  2169.         case Sequence:

  2170.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2171.             break;

  2172.         case SourcePackage:

  2173.         case MaterialPackage:

  2174.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2175.             break;

  2176.         case IndexTableSegment:

  2177.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2178.             av_freep(&seg->temporal_offset_entries);

  2179.             av_freep(&seg->flag_entries);

  2180.             av_freep(&seg->stream_offset_entries);

  2181.             break;

  2182.         default:

  2183.             break;

  2184.         }

  2185.         av_freep(&mxf->metadata_sets[i]);

  2186.     }

  2187.     av_freep(&mxf->partitions);

  2188.     av_freep(&mxf->metadata_sets);

  2189.     av_freep(&mxf->aesc);

  2190.     av_freep(&mxf->local_tags);

  2191. 

  2192.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2193.         av_freep(&mxf->index_tables[i].segments);

  2194.         av_freep(&mxf->index_tables[i].ptses);

  2195.         av_freep(&mxf->index_tables[i].fake_index);

  2196.     }

  2197.     av_freep(&mxf->index_tables);

  2198. 

  2199.     return 0;

  2200. }

  2201. 

  2202. static int mxf_probe(AVProbeData *p) {

  2203.     uint8_t *bufp = p->buf;

  2204.     uint8_t *end = p->buf + p->buf_size;

  2205. 

  2206.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2207.         return 0;

  2208. 

  2209.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2210.     end -= sizeof(mxf_header_partition_pack_key);

  2211.     for (; bufp < end; bufp++) {

  2212.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2213.             return AVPROBE_SCORE_MAX;

  2214.     }

  2215.     return 0;

  2216. }

  2217. 

  2218. /* rudimentary byte seek */

  2219. /* XXX: use MXF Index */

  2220. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2221. {

  2222.     AVStream *st = s->streams[stream_index];

  2223.     int64_t seconds;

  2224.     MXFContext* mxf = s->priv_data;

  2225.     int64_t seekpos;

  2226.     int ret;

  2227.     MXFIndexTable *t;

  2228. 

  2229.     if (mxf->nb_index_tables <= 0) {

  2230.     if (!s->bit_rate)

  2231.         return AVERROR_INVALIDDATA;

  2232.     if (sample_time < 0)

  2233.         sample_time = 0;

  2234.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2235. 

  2236.     seekpos = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  2237.     if (seekpos < 0)

  2238.         return seekpos;

  2239. 

  2240.     ff_update_cur_dts(s, st, sample_time);

  2241.     mxf->current_edit_unit = sample_time;

  2242.     } else {

  2243.         t = &mxf->index_tables[0];

  2244. 

  2245.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2246.          * this also means we allow seeking before the start */

  2247.         sample_time = FFMAX(sample_time, 0);

  2248. 

  2249.         if (t->fake_index) {

  2250.             /* behave as if we have a proper index */

  2251.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2252.                 return sample_time;

  2253.         } else {

  2254.             /* no IndexEntryArray (one or more CBR segments)

  2255.              * make sure we don't seek past the end */

  2256.             sample_time = FFMIN(sample_time, st->duration - 1);

  2257.         }

  2258. 

  2259.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2260.             return ret;

  2261. 

  2262.         ff_update_cur_dts(s, st, sample_time);

  2263.         mxf->current_edit_unit = sample_time;

  2264.         avio_seek(s->pb, seekpos, SEEK_SET);

  2265.     }

  2266.     return 0;

  2267. }

  2268. 

  2269. AVInputFormat ff_mxf_demuxer = {

  2270.     .name           = "mxf",

  2271.     .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

  2272.     .priv_data_size = sizeof(MXFContext),

  2273.     .read_probe     = mxf_probe,

  2274.     .read_header    = mxf_read_header,

  2275.     .read_packet    = mxf_read_packet,

  2276.     .read_close     = mxf_read_close,

  2277.     .read_seek      = mxf_read_seek,

  2278. };