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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "libavutil/timecode.h"

  52. #include "avformat.h"

  53. #include "internal.h"

  54. #include "mxf.h"

  55. 

  56. typedef enum {

  57.     Header,

  58.     BodyPartition,

  59.     Footer

  60. } MXFPartitionType;

  61. 

  62. typedef enum {

  63.     OP1a = 1,

  64.     OP1b,

  65.     OP1c,

  66.     OP2a,

  67.     OP2b,

  68.     OP2c,

  69.     OP3a,

  70.     OP3b,

  71.     OP3c,

  72.     OPAtom,

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

  74. } MXFOP;

  75. 

  76. typedef struct {

  77.     int closed;

  78.     int complete;

  79.     MXFPartitionType type;

  80.     uint64_t previous_partition;

  81.     int index_sid;

  82.     int body_sid;

  83.     int64_t this_partition;

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

  85.     int64_t essence_length;

  86.     int32_t kag_size;

  87.     int64_t header_byte_count;

  88.     int64_t index_byte_count;

  89.     int pack_length;

  90. } MXFPartition;

  91. 

  92. typedef struct {

  93.     UID uid;

  94.     enum MXFMetadataSetType type;

  95.     UID source_container_ul;

  96. } MXFCryptoContext;

  97. 

  98. typedef struct {

  99.     UID uid;

  100.     enum MXFMetadataSetType type;

  101.     UID source_package_uid;

  102.     UID data_definition_ul;

  103.     int64_t duration;

  104.     int64_t start_position;

  105.     int source_track_id;

  106. } MXFStructuralComponent;

  107. 

  108. typedef struct {

  109.     UID uid;

  110.     enum MXFMetadataSetType type;

  111.     UID data_definition_ul;

  112.     UID *structural_components_refs;

  113.     int structural_components_count;

  114.     int64_t duration;

  115. } MXFSequence;

  116. 

  117. typedef struct {

  118.     UID uid;

  119.     enum MXFMetadataSetType type;

  120.     int drop_frame;

  121.     int start_frame;

  122.     struct AVRational rate;

  123.     AVTimecode tc;

  124. } MXFTimecodeComponent;

  125. 

  126. typedef struct {

  127.     UID uid;

  128.     enum MXFMetadataSetType type;

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

  130.     UID sequence_ref;

  131.     int track_id;

  132.     uint8_t track_number[4];

  133.     AVRational edit_rate;

  134.     int intra_only;

  135. } MXFTrack;

  136. 

  137. typedef struct {

  138.     UID uid;

  139.     enum MXFMetadataSetType type;

  140.     UID essence_container_ul;

  141.     UID essence_codec_ul;

  142.     AVRational sample_rate;

  143.     AVRational aspect_ratio;

  144.     int width;

  145.     int height;

  146.     int channels;

  147.     int bits_per_sample;

  148.     unsigned int component_depth;

  149.     unsigned int horiz_subsampling;

  150.     unsigned int vert_subsampling;

  151.     UID *sub_descriptors_refs;

  152.     int sub_descriptors_count;

  153.     int linked_track_id;

  154.     uint8_t *extradata;

  155.     int extradata_size;

  156.     enum PixelFormat pix_fmt;

  157. } MXFDescriptor;

  158. 

  159. typedef struct {

  160.     UID uid;

  161.     enum MXFMetadataSetType type;

  162.     int edit_unit_byte_count;

  163.     int index_sid;

  164.     int body_sid;

  165.     AVRational index_edit_rate;

  166.     uint64_t index_start_position;

  167.     uint64_t index_duration;

  168.     int8_t *temporal_offset_entries;

  169.     int *flag_entries;

  170.     uint64_t *stream_offset_entries;

  171.     int nb_index_entries;

  172. } MXFIndexTableSegment;

  173. 

  174. typedef struct {

  175.     UID uid;

  176.     enum MXFMetadataSetType type;

  177.     UID package_uid;

  178.     UID *tracks_refs;

  179.     int tracks_count;

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

  181.     UID descriptor_ref;

  182. } MXFPackage;

  183. 

  184. typedef struct {

  185.     UID uid;

  186.     enum MXFMetadataSetType type;

  187. } MXFMetadataSet;

  188. 

  189. /* decoded index table */

  190. typedef struct {

  191.     int index_sid;

  192.     int body_sid;

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

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

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

  196.     int nb_segments;

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

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

  199. } MXFIndexTable;

  200. 

  201. typedef struct {

  202.     MXFPartition *partitions;

  203.     unsigned partitions_count;

  204.     MXFOP op;

  205.     UID *packages_refs;

  206.     int packages_count;

  207.     MXFMetadataSet **metadata_sets;

  208.     int metadata_sets_count;

  209.     AVFormatContext *fc;

  210.     struct AVAES *aesc;

  211.     uint8_t *local_tags;

  212.     int local_tags_count;

  213.     uint64_t footer_partition;

  214.     KLVPacket current_klv_data;

  215.     int current_klv_index;

  216.     int run_in;

  217.     MXFPartition *current_partition;

  218.     int parsing_backward;

  219.     int64_t last_forward_tell;

  220.     int last_forward_partition;

  221.     int current_edit_unit;

  222.     int nb_index_tables;

  223.     MXFIndexTable *index_tables;

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

  225. } MXFContext;

  226. 

  227. enum MXFWrappingScheme {

  228.     Frame,

  229.     Clip,

  230. };

  231. 

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

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

  234. 

  235. typedef struct {

  236.     const UID key;

  237.     MXFMetadataReadFunc *read;

  238.     int ctx_size;

  239.     enum MXFMetadataSetType type;

  240. } MXFMetadataReadTableEntry;

  241. 

  242. /* partial keys to match */

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

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

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

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

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

  248. /* complete keys to match */

  249. 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 };

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

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

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

  253. 

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

  255. 

  256. static int64_t klv_decode_ber_length(AVIOContext *pb)

  257. {

  258.     uint64_t size = avio_r8(pb);

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

  260.         int bytes_num = size & 0x7f;

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

  262.         if (bytes_num > 8)

  263.             return AVERROR_INVALIDDATA;

  264.         size = 0;

  265.         while (bytes_num--)

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

  267.     }

  268.     return size;

  269. }

  270. 

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

  272. {

  273.     int i, b;

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

  275.         b = avio_r8(pb);

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

  277.             i = 0;

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

  279.             i = -1;

  280.     }

  281.     return i == size;

  282. }

  283. 

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

  285. {

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

  287.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  293. }

  294. 

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

  296. {

  297.     int i;

  298. 

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

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

  301.         /* SMPTE 379M 7.3 */

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

  303.             return i;

  304.     }

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

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

  307. }

  308. 

  309. /* XXX: use AVBitStreamFilter */

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

  311. {

  312.     const uint8_t *buf_ptr, *end_ptr;

  313.     uint8_t *data_ptr;

  314.     int i;

  315. 

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

  317.         return AVERROR_INVALIDDATA;

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

  319.     if (length < 0)

  320.         return length;

  321.     data_ptr = pkt->data;

  322.     end_ptr = pkt->data + length;

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

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

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

  326.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  329.             else

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

  331.         }

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

  333.     }

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

  335.     return 0;

  336. }

  337. 

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

  339. {

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

  341.     MXFContext *mxf = s->priv_data;

  342.     AVIOContext *pb = s->pb;

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

  344.     int64_t size;

  345.     uint64_t orig_size;

  346.     uint64_t plaintext_size;

  347.     uint8_t ivec[16];

  348.     uint8_t tmpbuf[16];

  349.     int index;

  350. 

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

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

  353.         if (!mxf->aesc)

  354.             return AVERROR(ENOMEM);

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

  356.     }

  357.     // crypto context

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

  359.     // plaintext offset

  360.     klv_decode_ber_length(pb);

  361.     plaintext_size = avio_rb64(pb);

  362.     // source klv key

  363.     klv_decode_ber_length(pb);

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

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

  366.         return AVERROR_INVALIDDATA;

  367.     index = mxf_get_stream_index(s, klv);

  368.     if (index < 0)

  369.         return AVERROR_INVALIDDATA;

  370.     // source size

  371.     klv_decode_ber_length(pb);

  372.     orig_size = avio_rb64(pb);

  373.     if (orig_size < plaintext_size)

  374.         return AVERROR_INVALIDDATA;

  375.     // enc. code

  376.     size = klv_decode_ber_length(pb);

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

  378.         return AVERROR_INVALIDDATA;

  379.     avio_read(pb, ivec, 16);

  380.     avio_read(pb, tmpbuf, 16);

  381.     if (mxf->aesc)

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

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

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

  385.     size -= 32;

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

  387.     if (size < 0)

  388.         return size;

  389.     else if (size < plaintext_size)

  390.         return AVERROR_INVALIDDATA;

  391.     size -= plaintext_size;

  392.     if (mxf->aesc)

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

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

  395.     av_shrink_packet(pkt, orig_size);

  396.     pkt->stream_index = index;

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

  398.     return 0;

  399. }

  400. 

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

  402. {

  403.     MXFContext *mxf = arg;

  404.     int item_num = avio_rb32(pb);

  405.     int item_len = avio_rb32(pb);

  406. 

  407.     if (item_len != 18) {

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

  409.                               item_len);

  410.         return AVERROR_PATCHWELCOME;

  411.     }

  412.     if (item_num > UINT_MAX / item_len)

  413.         return AVERROR_INVALIDDATA;

  414.     mxf->local_tags_count = item_num;

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

  416.     if (!mxf->local_tags)

  417.         return AVERROR(ENOMEM);

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

  419.     return 0;

  420. }

  421. 

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

  423. {

  424.     MXFContext *mxf = arg;

  425.     MXFPartition *partition, *tmp_part;

  426.     UID op;

  427.     uint64_t footer_partition;

  428.     uint32_t nb_essence_containers;

  429. 

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

  431.         return AVERROR(ENOMEM);

  432. 

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

  434.     if (!tmp_part)

  435.         return AVERROR(ENOMEM);

  436.     mxf->partitions = tmp_part;

  437. 

  438.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  445.     } else {

  446.         mxf->last_forward_partition++;

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

  448.     }

  449. 

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

  451.     mxf->partitions_count++;

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

  453. 

  454.     switch(uid[13]) {

  455.     case 2:

  456.         partition->type = Header;

  457.         break;

  458.     case 3:

  459.         partition->type = BodyPartition;

  460.         break;

  461.     case 4:

  462.         partition->type = Footer;

  463.         break;

  464.     default:

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

  466.         return AVERROR_INVALIDDATA;

  467.     }

  468. 

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

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

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

  472.     avio_skip(pb, 4);

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

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

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

  476.     footer_partition = avio_rb64(pb);

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

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

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

  480.     avio_skip(pb, 8);

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

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

  483.     nb_essence_containers = avio_rb32(pb);

  484. 

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

  486.     if (footer_partition) {

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

  488.             av_log(mxf->fc, AV_LOG_ERROR,

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

  490.                    mxf->footer_partition, footer_partition);

  491.         } else {

  492.             mxf->footer_partition = footer_partition;

  493.         }

  494.     }

  495. 

  496.     av_dlog(mxf->fc,

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

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

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

  500.             partition->this_partition,

  501.             partition->previous_partition, footer_partition,

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

  503. 

  504.     /* sanity check PreviousPartition if set */

  505.     if (partition->previous_partition &&

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

  507.         av_log(mxf->fc, AV_LOG_ERROR,

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

  509.         return AVERROR_INVALIDDATA;

  510.     }

  511. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  525.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  527.         if (nb_essence_containers != 1) {

  528.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  529. 

  530.             /* only nag once */

  531.             if (!mxf->op)

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

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

  534. 

  535.             mxf->op = op;

  536.         } else

  537.             mxf->op = OPAtom;

  538.     } else {

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

  540.         mxf->op = OP1a;

  541.     }

  542. 

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

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

  545. 

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

  547.             partition->kag_size = 512;

  548.         else

  549.             partition->kag_size = 1;

  550. 

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

  552.     }

  553. 

  554.     return 0;

  555. }

  556. 

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

  558. {

  559.     MXFMetadataSet **tmp;

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

  561.         return AVERROR(ENOMEM);

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

  563.     if (!tmp)

  564.         return AVERROR(ENOMEM);

  565.     mxf->metadata_sets = tmp;

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

  567.     mxf->metadata_sets_count++;

  568.     return 0;

  569. }

  570. 

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

  572. {

  573.     MXFCryptoContext *cryptocontext = arg;

  574.     if (size != 16)

  575.         return AVERROR_INVALIDDATA;

  576.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  578.     return 0;

  579. }

  580. 

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

  582. {

  583.     MXFContext *mxf = arg;

  584.     switch (tag) {

  585.     case 0x1901:

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

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

  588.             return AVERROR_INVALIDDATA;

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

  590.         if (!mxf->packages_refs)

  591.             return AVERROR(ENOMEM);

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

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

  594.         break;

  595.     }

  596.     return 0;

  597. }

  598. 

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

  600. {

  601.     MXFStructuralComponent *source_clip = arg;

  602.     switch(tag) {

  603.     case 0x0202:

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

  605.         break;

  606.     case 0x1201:

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

  608.         break;

  609.     case 0x1101:

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

  611.         avio_skip(pb, 16);

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

  613.         break;

  614.     case 0x1102:

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

  616.         break;

  617.     }

  618.     return 0;

  619. }

  620. 

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

  622. {

  623.     MXFPackage *package = arg;

  624.     switch(tag) {

  625.     case 0x4403:

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

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

  628.             return AVERROR_INVALIDDATA;

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

  630.         if (!package->tracks_refs)

  631.             return AVERROR(ENOMEM);

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

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

  634.         break;

  635.     }

  636.     return 0;

  637. }

  638. 

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

  640. {

  641.     MXFTimecodeComponent *mxf_timecode = arg;

  642.     switch(tag) {

  643.     case 0x1501:

  644.         mxf_timecode->start_frame = avio_rb64(pb);

  645.         break;

  646.     case 0x1502:

  647.         mxf_timecode->rate = (AVRational){avio_rb16(pb), 1};

  648.         break;

  649.     case 0x1503:

  650.         mxf_timecode->drop_frame = avio_r8(pb);

  651.         break;

  652.     }

  653.     return 0;

  654. }

  655. 

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

  657. {

  658.     MXFTrack *track = arg;

  659.     switch(tag) {

  660.     case 0x4801:

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

  662.         break;

  663.     case 0x4804:

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

  665.         break;

  666.     case 0x4B01:

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

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

  669.         break;

  670.     case 0x4803:

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

  672.         break;

  673.     }

  674.     return 0;

  675. }

  676. 

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

  678. {

  679.     MXFSequence *sequence = arg;

  680.     switch(tag) {

  681.     case 0x0202:

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

  683.         break;

  684.     case 0x0201:

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

  686.         break;

  687.     case 0x1001:

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

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

  690.             return AVERROR_INVALIDDATA;

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

  692.         if (!sequence->structural_components_refs)

  693.             return AVERROR(ENOMEM);

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

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

  696.         break;

  697.     }

  698.     return 0;

  699. }

  700. 

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

  702. {

  703.     MXFPackage *package = arg;

  704.     switch(tag) {

  705.     case 0x4403:

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

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

  708.             return AVERROR_INVALIDDATA;

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

  710.         if (!package->tracks_refs)

  711.             return AVERROR(ENOMEM);

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

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

  714.         break;

  715.     case 0x4401:

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

  717.         avio_skip(pb, 16);

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

  719.         break;

  720.     case 0x4701:

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

  722.         break;

  723.     }

  724.     return 0;

  725. }

  726. 

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

  728. {

  729.     int i, length;

  730. 

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

  732.     length = avio_rb32(pb);

  733. 

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

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

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

  737.         return AVERROR(ENOMEM);

  738. 

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

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

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

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

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

  744.         avio_skip(pb, length - 11);

  745.     }

  746.     return 0;

  747. }

  748. 

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

  750. {

  751.     MXFIndexTableSegment *segment = arg;

  752.     switch(tag) {

  753.     case 0x3F05:

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

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

  756.         break;

  757.     case 0x3F06:

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

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

  760.         break;

  761.     case 0x3F07:

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

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

  764.         break;

  765.     case 0x3F0A:

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

  767.         return mxf_read_index_entry_array(pb, segment);

  768.     case 0x3F0B:

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

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

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

  772.                 segment->index_edit_rate.den);

  773.         break;

  774.     case 0x3F0C:

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

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

  777.         break;

  778.     case 0x3F0D:

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

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

  781.         break;

  782.     }

  783.     return 0;

  784. }

  785. 

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

  787. {

  788.     int code, value, ofs = 0;

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

  790. 

  791.     do {

  792.         code = avio_r8(pb);

  793.         value = avio_r8(pb);

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

  795. 

  796.         if (ofs < 16) {

  797.             layout[ofs++] = code;

  798.             layout[ofs++] = value;

  799.         }

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

  801. 

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

  803. }

  804. 

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

  806. {

  807.     MXFDescriptor *descriptor = arg;

  808.     descriptor->pix_fmt = PIX_FMT_NONE;

  809.     switch(tag) {

  810.     case 0x3F01:

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

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

  813.             return AVERROR_INVALIDDATA;

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

  815.         if (!descriptor->sub_descriptors_refs)

  816.             return AVERROR(ENOMEM);

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

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

  819.         break;

  820.     case 0x3004:

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

  822.         break;

  823.     case 0x3006:

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

  825.         break;

  826.     case 0x3201: /* PictureEssenceCoding */

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

  828.         break;

  829.     case 0x3203:

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

  831.         break;

  832.     case 0x3202:

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

  834.         break;

  835.     case 0x320E:

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

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

  838.         break;

  839.     case 0x3301:

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

  841.         break;

  842.     case 0x3302:

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

  844.         break;

  845.     case 0x3308:

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

  847.         break;

  848.     case 0x3D03:

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

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

  851.         break;

  852.     case 0x3D06: /* SoundEssenceCompression */

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

  854.         break;

  855.     case 0x3D07:

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

  857.         break;

  858.     case 0x3D01:

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

  860.         break;

  861.     case 0x3401:

  862.         mxf_read_pixel_layout(pb, descriptor);

  863.         break;

  864.     default:

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

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

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

  868.             if (!descriptor->extradata)

  869.                 return AVERROR(ENOMEM);

  870.             descriptor->extradata_size = size;

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

  872.         }

  873.         break;

  874.     }

  875.     return 0;

  876. }

  877. 

  878. /*

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

  880.  * Returns: boolean

  881.  */

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

  883. {

  884.     int i;

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

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

  887.             return 0;

  888.     }

  889.     return 1;

  890. }

  891. 

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

  893. {

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

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

  896.             break;

  897.         uls++;

  898.     }

  899.     return uls;

  900. }

  901. 

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

  903. {

  904.     int i;

  905. 

  906.     if (!strong_ref)

  907.         return NULL;

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

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

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

  911.             return mxf->metadata_sets[i];

  912.         }

  913.     }

  914.     return NULL;

  915. }

  916. 

  917. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  918.     // video essence container uls

  919.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  920.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  921.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  922.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  923. };

  924. 

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

  926. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  927.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  928.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  929. };

  930. 

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

  932. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  933.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  934.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },

  935. };

  936. 

  937. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  938.     // sound essence container uls

  939.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  940.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  941.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  942.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  943.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  944. };

  945. 

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

  947. {

  948.     int i, j, nb_segments = 0;

  949.     MXFIndexTableSegment **unsorted_segments;

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

  951. 

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

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

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

  955.             nb_segments++;

  956. 

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

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

  959.         av_freep(sorted_segments);

  960.         av_free(unsorted_segments);

  961.         return AVERROR(ENOMEM);

  962.     }

  963. 

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

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

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

  967. 

  968.     *nb_sorted_segments = 0;

  969. 

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

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

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

  973. 

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

  975.             MXFIndexTableSegment *s = unsorted_segments[j];

  976. 

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

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

  979.              */

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

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

  982.                 best             = j;

  983.                 best_body_sid    = s->body_sid;

  984.                 best_index_sid   = s->index_sid;

  985.                 best_index_start = s->index_start_position;

  986.             }

  987.         }

  988. 

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

  990.         if (best == -1)

  991.             break;

  992. 

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

  994.         last_body_sid    = best_body_sid;

  995.         last_index_sid   = best_index_sid;

  996.         last_index_start = best_index_start;

  997.     }

  998. 

  999.     av_free(unsorted_segments);

  1000. 

  1001.     return 0;

  1002. }

  1003. 

  1004. /**

  1005.  * Computes the absolute file offset of the given essence container offset

  1006.  */

  1007. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1008. {

  1009.     int x;

  1010.     int64_t offset_in = offset;     /* for logging */

  1011. 

  1012.     for (x = 0; x < mxf->partitions_count; x++) {

  1013.         MXFPartition *p = &mxf->partitions[x];

  1014. 

  1015.         if (p->body_sid != body_sid)

  1016.             continue;

  1017. 

  1018.         if (offset < p->essence_length || !p->essence_length) {

  1019.             *offset_out = p->essence_offset + offset;

  1020.             return 0;

  1021.         }

  1022. 

  1023.         offset -= p->essence_length;

  1024.     }

  1025. 

  1026.     av_log(mxf->fc, AV_LOG_ERROR,

  1027.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1028.            offset_in, body_sid);

  1029. 

  1030.     return AVERROR_INVALIDDATA;

  1031. }

  1032. 

  1033. /**

  1034.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1035.  */

  1036. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1037. {

  1038.     int x;

  1039.     int64_t ret = 0;

  1040. 

  1041.     for (x = 0; x < mxf->partitions_count; x++) {

  1042.         MXFPartition *p = &mxf->partitions[x];

  1043. 

  1044.         if (p->body_sid != body_sid)

  1045.             continue;

  1046. 

  1047.         if (!p->essence_length)

  1048.             return 0;

  1049. 

  1050.         ret = p->essence_offset + p->essence_length;

  1051.     }

  1052. 

  1053.     return ret;

  1054. }

  1055. 

  1056. /* EditUnit -> absolute offset */

  1057. 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)

  1058. {

  1059.     int i;

  1060.     int64_t offset_temp = 0;

  1061. 

  1062.     for (i = 0; i < index_table->nb_segments; i++) {

  1063.         MXFIndexTableSegment *s = index_table->segments[i];

  1064. 

  1065.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1066. 

  1067.         if (edit_unit < s->index_start_position + s->index_duration) {

  1068.             int64_t index = edit_unit - s->index_start_position;

  1069. 

  1070.             if (s->edit_unit_byte_count)

  1071.                 offset_temp += s->edit_unit_byte_count * index;

  1072.             else if (s->nb_index_entries) {

  1073.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1074.                     index *= 2;     /* Avid index */

  1075. 

  1076.                 if (index < 0 || index > s->nb_index_entries) {

  1077.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1078.                            index_table->index_sid, s->index_start_position);

  1079.                     return AVERROR_INVALIDDATA;

  1080.                 }

  1081. 

  1082.                 offset_temp = s->stream_offset_entries[index];

  1083.             } else {

  1084.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1085.                        index_table->index_sid, s->index_start_position);

  1086.                 return AVERROR_INVALIDDATA;

  1087.             }

  1088. 

  1089.             if (edit_unit_out)

  1090.                 *edit_unit_out = edit_unit;

  1091. 

  1092.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1093.         } else {

  1094.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1095.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1096.         }

  1097.     }

  1098. 

  1099.     if (nag)

  1100.         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);

  1101. 

  1102.     return AVERROR_INVALIDDATA;

  1103. }

  1104. 

  1105. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1106. {

  1107.     int i, j, x;

  1108.     int8_t max_temporal_offset = -128;

  1109. 

  1110.     /* first compute how many entries we have */

  1111.     for (i = 0; i < index_table->nb_segments; i++) {

  1112.         MXFIndexTableSegment *s = index_table->segments[i];

  1113. 

  1114.         if (!s->nb_index_entries) {

  1115.             index_table->nb_ptses = 0;

  1116.             return 0;                               /* no TemporalOffsets */

  1117.         }

  1118. 

  1119.         index_table->nb_ptses += s->index_duration;

  1120.     }

  1121. 

  1122.     /* paranoid check */

  1123.     if (index_table->nb_ptses <= 0)

  1124.         return 0;

  1125. 

  1126.     if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||

  1127.         !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry)))) {

  1128.         av_freep(&index_table->ptses);

  1129.         return AVERROR(ENOMEM);

  1130.     }

  1131. 

  1132.     /* we may have a few bad TemporalOffsets

  1133.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1134.     for (x = 0; x < index_table->nb_ptses; x++)

  1135.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1136. 

  1137.     /**

  1138.      * We have this:

  1139.      *

  1140.      * x  TemporalOffset

  1141.      * 0:  0

  1142.      * 1:  1

  1143.      * 2:  1

  1144.      * 3: -2

  1145.      * 4:  1

  1146.      * 5:  1

  1147.      * 6: -2

  1148.      *

  1149.      * We want to transform it into this:

  1150.      *

  1151.      * x  DTS PTS

  1152.      * 0: -1   0

  1153.      * 1:  0   3

  1154.      * 2:  1   1

  1155.      * 3:  2   2

  1156.      * 4:  3   6

  1157.      * 5:  4   4

  1158.      * 6:  5   5

  1159.      *

  1160.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1161.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1162.      * The latter makes DTS <= PTS.

  1163.      */

  1164.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1165.         MXFIndexTableSegment *s = index_table->segments[i];

  1166.         int index_delta = 1;

  1167.         int n = s->nb_index_entries;

  1168. 

  1169.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1170.             index_delta = 2;    /* Avid index */

  1171.             /* ignore the last entry - it's the size of the essence container */

  1172.             n--;

  1173.         }

  1174. 

  1175.         for (j = 0; j < n; j += index_delta, x++) {

  1176.             int offset = s->temporal_offset_entries[j] / index_delta;

  1177.             int index  = x + offset;

  1178. 

  1179.             if (x >= index_table->nb_ptses) {

  1180.                 av_log(mxf->fc, AV_LOG_ERROR,

  1181.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1182.                        s->nb_index_entries, s->index_duration);

  1183.                 break;

  1184.             }

  1185. 

  1186.             index_table->fake_index[x].timestamp = x;

  1187.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1188. 

  1189.             if (index < 0 || index >= index_table->nb_ptses) {

  1190.                 av_log(mxf->fc, AV_LOG_ERROR,

  1191.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1192.                        x, offset, index);

  1193.                 continue;

  1194.             }

  1195. 

  1196.             index_table->ptses[index] = x;

  1197.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1198.         }

  1199.     }

  1200. 

  1201.     index_table->first_dts = -max_temporal_offset;

  1202. 

  1203.     return 0;

  1204. }

  1205. 

  1206. /**

  1207.  * Sorts and collects index table segments into index tables.

  1208.  * Also computes PTSes if possible.

  1209.  */

  1210. static int mxf_compute_index_tables(MXFContext *mxf)

  1211. {

  1212.     int i, j, k, ret, nb_sorted_segments;

  1213.     MXFIndexTableSegment **sorted_segments = NULL;

  1214. 

  1215.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1216.         nb_sorted_segments <= 0) {

  1217.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1218.         return 0;

  1219.     }

  1220. 

  1221.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1222.     for (i = 0; i < nb_sorted_segments; i++) {

  1223.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1224.             mxf->nb_index_tables++;

  1225.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1226.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1227.             ret = AVERROR_INVALIDDATA;

  1228.             goto finish_decoding_index;

  1229.         }

  1230.     }

  1231. 

  1232.     if (!(mxf->index_tables = av_calloc(mxf->nb_index_tables, sizeof(MXFIndexTable)))) {

  1233.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1234.         ret = AVERROR(ENOMEM);

  1235.         goto finish_decoding_index;

  1236.     }

  1237. 

  1238.     /* distribute sorted segments to index tables */

  1239.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1240.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1241.             /* next IndexSID */

  1242.             j++;

  1243.         }

  1244. 

  1245.         mxf->index_tables[j].nb_segments++;

  1246.     }

  1247. 

  1248.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1249.         MXFIndexTable *t = &mxf->index_tables[j];

  1250. 

  1251.         if (!(t->segments = av_calloc(t->nb_segments, sizeof(MXFIndexTableSegment*)))) {

  1252.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment pointer array\n");

  1253.             ret = AVERROR(ENOMEM);

  1254.             goto finish_decoding_index;

  1255.         }

  1256. 

  1257.         if (sorted_segments[i]->index_start_position)

  1258.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1259.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1260. 

  1261.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1262.         t->index_sid = sorted_segments[i]->index_sid;

  1263.         t->body_sid = sorted_segments[i]->body_sid;

  1264. 

  1265.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1266.             goto finish_decoding_index;

  1267. 

  1268.         /* fix zero IndexDurations */

  1269.         for (k = 0; k < t->nb_segments; k++) {

  1270.             if (t->segments[k]->index_duration)

  1271.                 continue;

  1272. 

  1273.             if (t->nb_segments > 1)

  1274.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1275.                        t->index_sid, k);

  1276. 

  1277.             if (mxf->fc->nb_streams <= 0) {

  1278.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1279.                 break;

  1280.             }

  1281. 

  1282.             /* assume the first stream's duration is reasonable

  1283.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1284.              */

  1285.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1286.             break;

  1287.         }

  1288.     }

  1289. 

  1290.     ret = 0;

  1291. finish_decoding_index:

  1292.     av_free(sorted_segments);

  1293.     return ret;

  1294. }

  1295. 

  1296. static int mxf_is_intra_only(MXFDescriptor *descriptor)

  1297. {

  1298.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1299.                             &descriptor->essence_container_ul)->id != CODEC_ID_NONE ||

  1300.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1301.                             &descriptor->essence_codec_ul)->id     != CODEC_ID_NONE;

  1302. }

  1303. 

  1304. static int mxf_add_timecode_metadata(AVDictionary **pm, const char *key, AVTimecode *tc)

  1305. {

  1306.     char buf[AV_TIMECODE_STR_SIZE];

  1307.     av_dict_set(pm, key, av_timecode_make_string(tc, buf, 0), 0);

  1308. 

  1309.     return 0;

  1310. }

  1311. 

  1312. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1313. {

  1314.     MXFPackage *material_package = NULL;

  1315.     MXFPackage *temp_package = NULL;

  1316.     int i, j, k, ret;

  1317. 

  1318.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1319.     /* TODO: handle multiple material packages (OP3x) */

  1320.     for (i = 0; i < mxf->packages_count; i++) {

  1321.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1322.         if (material_package) break;

  1323.     }

  1324.     if (!material_package) {

  1325.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1326.         return AVERROR_INVALIDDATA;

  1327.     }

  1328. 

  1329.     for (i = 0; i < material_package->tracks_count; i++) {

  1330.         MXFPackage *source_package = NULL;

  1331.         MXFTrack *material_track = NULL;

  1332.         MXFTrack *source_track = NULL;

  1333.         MXFTrack *temp_track = NULL;

  1334.         MXFDescriptor *descriptor = NULL;

  1335.         MXFStructuralComponent *component = NULL;

  1336.         MXFTimecodeComponent *mxf_tc = NULL;

  1337.         UID *essence_container_ul = NULL;

  1338.         const MXFCodecUL *codec_ul = NULL;

  1339.         const MXFCodecUL *container_ul = NULL;

  1340.         const MXFCodecUL *pix_fmt_ul = NULL;

  1341.         AVStream *st;

  1342.         AVTimecode tc;

  1343.         int flags;

  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 ((component = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, TimecodeComponent))) {

  1351.             mxf_tc = (MXFTimecodeComponent*)component;

  1352.             flags = mxf_tc->drop_frame == 1 ? AV_TIMECODE_FLAG_DROPFRAME : 0;

  1353.             if (av_timecode_init(&tc, mxf_tc->rate, flags, mxf_tc->start_frame, mxf) == 0) {

  1354.                 mxf_add_timecode_metadata(&mxf->fc->metadata, "timecode", &tc);

  1355.             }

  1356.         }

  1357. 

  1358.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1359.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1360.             continue;

  1361.         }

  1362. 

  1363.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1364.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], TimecodeComponent);

  1365.             if (!component)

  1366.                 continue;

  1367. 

  1368.             mxf_tc = (MXFTimecodeComponent*)component;

  1369.             flags = mxf_tc->drop_frame == 1 ? AV_TIMECODE_FLAG_DROPFRAME : 0;

  1370.             if (av_timecode_init(&tc, mxf_tc->rate, flags, mxf_tc->start_frame, mxf) == 0) {

  1371.                 mxf_add_timecode_metadata(&mxf->fc->metadata, "timecode", &tc);

  1372.                 break;

  1373.             }

  1374.         }

  1375. 

  1376.         /* TODO: handle multiple source clips */

  1377.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1378.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1379.             if (!component)

  1380.                 continue;

  1381. 

  1382.             for (k = 0; k < mxf->packages_count; k++) {

  1383.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1384.                 if (!temp_package)

  1385.                     continue;

  1386.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1387.                     source_package = temp_package;

  1388.                     break;

  1389.                 }

  1390.             }

  1391.             if (!source_package) {

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

  1393.                 break;

  1394.             }

  1395.             for (k = 0; k < source_package->tracks_count; k++) {

  1396.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

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

  1398.                     ret = AVERROR_INVALIDDATA;

  1399.                     goto fail_and_free;

  1400.                 }

  1401.                 if (temp_track->track_id == component->source_track_id) {

  1402.                     source_track = temp_track;

  1403.                     break;

  1404.                 }

  1405.             }

  1406.             if (!source_track) {

  1407.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1408.                 break;

  1409.             }

  1410.         }

  1411.         if (!source_track || !component)

  1412.             continue;

  1413. 

  1414.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1415.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1416.             ret = AVERROR_INVALIDDATA;

  1417.             goto fail_and_free;

  1418.         }

  1419. 

  1420.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1421.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1422.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1423.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1424.             continue;

  1425.         }

  1426. 

  1427.         st = avformat_new_stream(mxf->fc, NULL);

  1428.         if (!st) {

  1429.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1430.             ret = AVERROR(ENOMEM);

  1431.             goto fail_and_free;

  1432.         }

  1433.         st->id = source_track->track_id;

  1434.         st->priv_data = source_track;

  1435.         st->duration = component->duration;

  1436.         if (st->duration == -1)

  1437.             st->duration = AV_NOPTS_VALUE;

  1438.         st->start_time = component->start_position;

  1439.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1440. 

  1441.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1442.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1443.         st->codec->codec_type = codec_ul->id;

  1444. 

  1445.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1446.         if (source_package->descriptor) {

  1447.             if (source_package->descriptor->type == MultipleDescriptor) {

  1448.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1449.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1450. 

  1451.                     if (!sub_descriptor) {

  1452.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1453.                         continue;

  1454.                     }

  1455.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1456.                         descriptor = sub_descriptor;

  1457.                         break;

  1458.                     }

  1459.                 }

  1460.             } else if (source_package->descriptor->type == Descriptor)

  1461.                 descriptor = source_package->descriptor;

  1462.         }

  1463.         if (!descriptor) {

  1464.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1465.             continue;

  1466.         }

  1467.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1468.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1469.         essence_container_ul = &descriptor->essence_container_ul;

  1470.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1471.          * is not allowed according to s429-6, try to find correct information anyway */

  1472.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1473.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1474.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1475.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1476.                 if (metadata->type == CryptoContext) {

  1477.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1478.                     break;

  1479.                 }

  1480.             }

  1481.         }

  1482. 

  1483.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1484.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1485.         st->codec->codec_id = codec_ul->id;

  1486.         if (descriptor->extradata) {

  1487.             st->codec->extradata = descriptor->extradata;

  1488.             st->codec->extradata_size = descriptor->extradata_size;

  1489.         }

  1490.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1491.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1492.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1493.             if (st->codec->codec_id == CODEC_ID_NONE)

  1494.                 st->codec->codec_id = container_ul->id;

  1495.             st->codec->width = descriptor->width;

  1496.             st->codec->height = descriptor->height;

  1497.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO) {

  1498.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1499.                 if (st->codec->pix_fmt == PIX_FMT_NONE) {

  1500.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls, &descriptor->essence_codec_ul);

  1501.                     st->codec->pix_fmt = pix_fmt_ul->id;

  1502.                     if (st->codec->pix_fmt == PIX_FMT_NONE) {

  1503.                         /* support files created before RP224v10 by defaulting to UYVY422

  1504.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1505.                         if (descriptor->horiz_subsampling == 2 &&

  1506.                             descriptor->vert_subsampling == 1 &&

  1507.                             descriptor->component_depth == 8) {

  1508.                             st->codec->pix_fmt = PIX_FMT_UYVY422;

  1509.                         }

  1510.                     }

  1511.                 }

  1512.             }

  1513.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1514.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1515.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1516.             if (st->codec->codec_id == CODEC_ID_NONE)

  1517.                 st->codec->codec_id = container_ul->id;

  1518.             st->codec->channels = descriptor->channels;

  1519.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1520. 

  1521.             if (descriptor->sample_rate.den > 0)

  1522.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1523. 

  1524.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1525.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1526.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1527.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1528.                 else if (descriptor->bits_per_sample == 32)

  1529.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1530.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1531.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1532.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1533.                 else if (descriptor->bits_per_sample == 32)

  1534.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1535.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1536.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1537.             }

  1538.         }

  1539.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1540.             /* TODO: decode timestamps */

  1541.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1542.         }

  1543.     }

  1544. 

  1545.     ret = 0;

  1546. fail_and_free:

  1547.     return ret;

  1548. }

  1549. 

  1550. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1551.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1552.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1553.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1554.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1555.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1556.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1557.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1558.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1559.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1560.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

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

  1562.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1563.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1564.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1565.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1566.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1567.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1568.     { { 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 */

  1569.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1570.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1571.     { { 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 */

  1572.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1573.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1574.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1575.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1576.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x14,0x00 }, mxf_read_timecode_component, sizeof(MXFTimecodeComponent), TimecodeComponent },

  1577.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1578.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1579.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1580. };

  1581. 

  1582. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1583. {

  1584.     AVIOContext *pb = mxf->fc->pb;

  1585.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1586.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1587. 

  1588.     if (!ctx)

  1589.         return AVERROR(ENOMEM);

  1590.     while (avio_tell(pb) + 4 < klv_end && !url_feof(pb)) {

  1591.         int ret;

  1592.         int tag = avio_rb16(pb);

  1593.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1594.         uint64_t next = avio_tell(pb) + size;

  1595.         UID uid = {0};

  1596. 

  1597.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1598.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1599.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1600.             continue;

  1601.         }

  1602.         if (tag > 0x7FFF) { /* dynamic tag */

  1603.             int i;

  1604.             for (i = 0; i < mxf->local_tags_count; i++) {

  1605.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1606.                 if (local_tag == tag) {

  1607.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1608.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1609.                     PRINT_KEY(mxf->fc, "uid", uid);

  1610.                 }

  1611.             }

  1612.         }

  1613.         if (ctx_size && tag == 0x3C0A)

  1614.             avio_read(pb, ctx->uid, 16);

  1615.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1616.             return ret;

  1617. 

  1618.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1619.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1620.         if (avio_tell(pb) > klv_end) {

  1621.             av_log(mxf->fc, AV_LOG_ERROR,

  1622.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1623.                    tag, klv->offset);

  1624.             return AVERROR_INVALIDDATA;

  1625.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1626.             avio_seek(pb, next, SEEK_SET);

  1627.     }

  1628.     if (ctx_size) ctx->type = type;

  1629.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1630. }

  1631. 

  1632. /**

  1633.  * Seeks to the previous partition, if possible

  1634.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1635.  */

  1636. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1637. {

  1638.     AVIOContext *pb = mxf->fc->pb;

  1639. 

  1640.     if (!mxf->current_partition ||

  1641.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1642.         return 0;   /* we've parsed all partitions */

  1643. 

  1644.     /* seek to previous partition */

  1645.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1646.     mxf->current_partition = NULL;

  1647. 

  1648.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1649. 

  1650.     return 1;

  1651. }

  1652. 

  1653. /**

  1654.  * Called when essence is encountered

  1655.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1656.  */

  1657. static int mxf_parse_handle_essence(MXFContext *mxf)

  1658. {

  1659.     AVIOContext *pb = mxf->fc->pb;

  1660.     int64_t ret;

  1661. 

  1662.     if (mxf->parsing_backward) {

  1663.         return mxf_seek_to_previous_partition(mxf);

  1664.     } else {

  1665.         if (!mxf->footer_partition) {

  1666.             av_dlog(mxf->fc, "no footer\n");

  1667.             return 0;

  1668.         }

  1669. 

  1670.         av_dlog(mxf->fc, "seeking to footer\n");

  1671. 

  1672.         /* remember where we were so we don't end up seeking further back than this */

  1673.         mxf->last_forward_tell = avio_tell(pb);

  1674. 

  1675.         if (!pb->seekable) {

  1676.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1677.             return -1;

  1678.         }

  1679. 

  1680.         /* seek to footer partition and parse backward */

  1681.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1682.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1683.                    mxf->run_in + mxf->footer_partition, ret);

  1684.             return ret;

  1685.         }

  1686. 

  1687.         mxf->current_partition = NULL;

  1688.         mxf->parsing_backward = 1;

  1689.     }

  1690. 

  1691.     return 1;

  1692. }

  1693. 

  1694. /**

  1695.  * Called when the next partition or EOF is encountered

  1696.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1697.  */

  1698. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1699. {

  1700.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1701. }

  1702. 

  1703. /**

  1704.  * Figures out the proper offset and length of the essence container in each partition

  1705.  */

  1706. static void mxf_compute_essence_containers(MXFContext *mxf)

  1707. {

  1708.     int x;

  1709. 

  1710.     /* everything is already correct */

  1711.     if (mxf->op == OPAtom)

  1712.         return;

  1713. 

  1714.     for (x = 0; x < mxf->partitions_count; x++) {

  1715.         MXFPartition *p = &mxf->partitions[x];

  1716. 

  1717.         if (!p->body_sid)

  1718.             continue;       /* BodySID == 0 -> no essence */

  1719. 

  1720.         if (x >= mxf->partitions_count - 1)

  1721.             break;          /* last partition - can't compute length (and we don't need to) */

  1722. 

  1723.         /* essence container spans to the next partition */

  1724.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1725. 

  1726.         if (p->essence_length < 0) {

  1727.             /* next ThisPartition < essence_offset */

  1728.             p->essence_length = 0;

  1729.             av_log(mxf->fc, AV_LOG_ERROR,

  1730.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1731.                    x+1, mxf->partitions[x+1].this_partition);

  1732.         }

  1733.     }

  1734. }

  1735. 

  1736. static int64_t round_to_kag(int64_t position, int kag_size)

  1737. {

  1738.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1739.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1740.     int64_t ret = (position / kag_size) * kag_size;

  1741.     return ret == position ? ret : ret + kag_size;

  1742. }

  1743. 

  1744. static int is_pcm(enum CodecID codec_id)

  1745. {

  1746.     /* we only care about "normal" PCM codecs until we get samples */

  1747.     return codec_id >= CODEC_ID_PCM_S16LE && codec_id < CODEC_ID_PCM_S24DAUD;

  1748. }

  1749. 

  1750. /**

  1751.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1752.  * very small (2, 4..). In those cases we should read more than one

  1753.  * sample per call to mxf_read_packet().

  1754.  */

  1755. static void mxf_handle_small_eubc(AVFormatContext *s)

  1756. {

  1757.     MXFContext *mxf = s->priv_data;

  1758. 

  1759.     /* assuming non-OPAtom == frame wrapped

  1760.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1761.     if (mxf->op != OPAtom)

  1762.         return;

  1763. 

  1764.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1765.     if (s->nb_streams != 1                                     ||

  1766.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1767.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1768.         mxf->nb_index_tables != 1                              ||

  1769.         mxf->index_tables[0].nb_segments != 1                  ||

  1770.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1771.         return;

  1772. 

  1773.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1774.     /* TODO: We could compute this from the ratio between the audio

  1775.      *       and video edit rates for 48 kHz NTSC we could use the

  1776.      *       1802-1802-1802-1802-1801 pattern. */

  1777.     mxf->edit_units_per_packet = 1920;

  1778. }

  1779. 

  1780. static int mxf_read_header(AVFormatContext *s)

  1781. {

  1782.     MXFContext *mxf = s->priv_data;

  1783.     KLVPacket klv;

  1784.     int64_t essence_offset = 0;

  1785.     int ret;

  1786. 

  1787.     mxf->last_forward_tell = INT64_MAX;

  1788.     mxf->edit_units_per_packet = 1;

  1789. 

  1790.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1791.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1792.         return AVERROR_INVALIDDATA;

  1793.     }

  1794.     avio_seek(s->pb, -14, SEEK_CUR);

  1795.     mxf->fc = s;

  1796.     mxf->run_in = avio_tell(s->pb);

  1797. 

  1798.     while (!url_feof(s->pb)) {

  1799.         const MXFMetadataReadTableEntry *metadata;

  1800. 

  1801.         if (klv_read_packet(&klv, s->pb) < 0) {

  1802.             /* EOF - seek to previous partition or stop */

  1803.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1804.                 break;

  1805.             else

  1806.                 continue;

  1807.         }

  1808. 

  1809.         PRINT_KEY(s, "read header", klv.key);

  1810.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1811.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1812.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1813.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1814.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1815. 

  1816.             if (!mxf->current_partition) {

  1817.                 av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");

  1818.                 return AVERROR_INVALIDDATA;

  1819.             }

  1820. 

  1821.             if (!mxf->current_partition->essence_offset) {

  1822.                 /* for OP1a we compute essence_offset

  1823.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1824.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1825.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1826.                  */

  1827.                 int64_t op1a_essence_offset =

  1828.                     round_to_kag(mxf->current_partition->this_partition +

  1829.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1830.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1831.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1832. 

  1833.                 if (mxf->op == OPAtom) {

  1834.                     /* point essence_offset to the actual data

  1835.                     * OPAtom has all the essence in one big KLV

  1836.                     */

  1837.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1838.                     mxf->current_partition->essence_length = klv.length;

  1839.                 } else {

  1840.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1841.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1842.                 }

  1843.             }

  1844. 

  1845.             if (!essence_offset)

  1846.                 essence_offset = klv.offset;

  1847. 

  1848.             /* seek to footer, previous partition or stop */

  1849.             if (mxf_parse_handle_essence(mxf) <= 0)

  1850.                 break;

  1851.             continue;

  1852.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1853.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1854.             /* next partition pack - keep going, seek to previous partition or stop */

  1855.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1856.                 break;

  1857.         }

  1858. 

  1859.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1860.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1861.                 int res;

  1862.                 if (klv.key[5] == 0x53) {

  1863.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1864.                 } else {

  1865.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1866.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1867. 

  1868.                     /* only seek forward, else this can loop for a long time */

  1869.                     if (avio_tell(s->pb) > next) {

  1870.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1871.                                klv.offset);

  1872.                         return AVERROR_INVALIDDATA;

  1873.                     }

  1874. 

  1875.                     avio_seek(s->pb, next, SEEK_SET);

  1876.                 }

  1877.                 if (res < 0) {

  1878.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1879.                     return res;

  1880.                 }

  1881.                 break;

  1882.             }

  1883.         }

  1884.         if (!metadata->read)

  1885.             avio_skip(s->pb, klv.length);

  1886.     }

  1887.     /* FIXME avoid seek */

  1888.     if (!essence_offset)  {

  1889.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1890.         return AVERROR_INVALIDDATA;

  1891.     }

  1892.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1893. 

  1894.     mxf_compute_essence_containers(mxf);

  1895. 

  1896.     /* we need to do this before computing the index tables

  1897.      * to be able to fill in zero IndexDurations with st->duration */

  1898.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1899.         return ret;

  1900. 

  1901.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1902.         return ret;

  1903. 

  1904.     if (mxf->nb_index_tables > 1) {

  1905.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1906.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1907.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1908.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1909.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1910.         return AVERROR_INVALIDDATA;

  1911.     }

  1912. 

  1913.     mxf_handle_small_eubc(s);

  1914. 

  1915.     return 0;

  1916. }

  1917. 

  1918. /**

  1919.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1920.  * @return next_ofs if OK, <0 on error

  1921.  */

  1922. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  1923. {

  1924.     int64_t last_ofs = -1, next_ofs = -1;

  1925.     MXFIndexTable *t = &mxf->index_tables[0];

  1926. 

  1927.     /* this is called from the OP1a demuxing logic, which means there

  1928.      * may be no index tables */

  1929.     if (mxf->nb_index_tables <= 0)

  1930.         return -1;

  1931. 

  1932.     /* find mxf->current_edit_unit so that the next edit unit starts ahead of current_offset */

  1933.     while (mxf->current_edit_unit >= 0) {

  1934.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1, NULL, &next_ofs, 0) < 0)

  1935.             return -1;

  1936. 

  1937.         if (next_ofs <= last_ofs) {

  1938.             /* large next_ofs didn't change or current_edit_unit wrapped

  1939.              * around this fixes the infinite loop on zzuf3.mxf */

  1940.             av_log(mxf->fc, AV_LOG_ERROR,

  1941.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1942.             return - 1;

  1943.         }

  1944. 

  1945.         if (next_ofs > current_offset)

  1946.             break;

  1947. 

  1948.         last_ofs = next_ofs;

  1949.         mxf->current_edit_unit++;

  1950.     }

  1951. 

  1952.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files may lack IndexEntryArrays */

  1953.     if (mxf->current_edit_unit < 0)

  1954.         return -1;

  1955. 

  1956.     return next_ofs;

  1957. }

  1958. 

  1959. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1960. {

  1961.     KLVPacket klv;

  1962.     MXFContext *mxf = s->priv_data;

  1963. 

  1964.     while (!url_feof(s->pb)) {

  1965.         int ret;

  1966.         if (klv_read_packet(&klv, s->pb) < 0)

  1967.             return -1;

  1968.         PRINT_KEY(s, "read packet", klv.key);

  1969.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1970.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  1971.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  1972.             if (ret < 0) {

  1973.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  1974.                 return AVERROR_INVALIDDATA;

  1975.             }

  1976.             return 0;

  1977.         }

  1978.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1979.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  1980.             int index = mxf_get_stream_index(s, &klv);

  1981.             int64_t next_ofs, next_klv;

  1982. 

  1983.             if (index < 0) {

  1984.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  1985.                 goto skip;

  1986.             }

  1987.             if (s->streams[index]->discard == AVDISCARD_ALL)

  1988.                 goto skip;

  1989. 

  1990.             next_klv = avio_tell(s->pb) + klv.length;

  1991.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  1992. 

  1993.             if (next_ofs >= 0 && next_klv > next_ofs) {

  1994.                 /* if this check is hit then it's possible OPAtom was treated as OP1a

  1995.                  * truncate the packet since it's probably very large (>2 GiB is common) */

  1996.                 av_log_ask_for_sample(s,

  1997.                     "KLV for edit unit %i extends into next edit unit - OPAtom misinterpreted as OP1a?\n",

  1998.                     mxf->current_edit_unit);

  1999.                 klv.length = next_ofs - avio_tell(s->pb);

  2000.             }

  2001. 

  2002.             /* check for 8 channels AES3 element */

  2003.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2004.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  2005.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2006.                     return AVERROR_INVALIDDATA;

  2007.                 }

  2008.             } else {

  2009.                 ret = av_get_packet(s->pb, pkt, klv.length);

  2010.                 if (ret < 0)

  2011.                     return ret;

  2012.             }

  2013.             pkt->stream_index = index;

  2014.             pkt->pos = klv.offset;

  2015. 

  2016.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2017.                 /* mxf->current_edit_unit good - see if we have an index table to derive timestamps from */

  2018.                 MXFIndexTable *t = &mxf->index_tables[0];

  2019. 

  2020.                 if (mxf->nb_index_tables >= 1 && mxf->current_edit_unit < t->nb_ptses) {

  2021.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2022.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2023.                 }

  2024.             }

  2025. 

  2026.             /* seek for truncated packets */

  2027.             avio_seek(s->pb, next_klv, SEEK_SET);

  2028. 

  2029.             return 0;

  2030.         } else

  2031.         skip:

  2032.             avio_skip(s->pb, klv.length);

  2033.     }

  2034.     return AVERROR_EOF;

  2035. }

  2036. 

  2037. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2038. {

  2039.     MXFContext *mxf = s->priv_data;

  2040.     int ret, size;

  2041.     int64_t ret64, pos, next_pos;

  2042.     AVStream *st;

  2043.     MXFIndexTable *t;

  2044.     int edit_units;

  2045. 

  2046.     if (mxf->op != OPAtom)

  2047.         return mxf_read_packet_old(s, pkt);

  2048. 

  2049.     /* OPAtom - clip wrapped demuxing */

  2050.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2051.     st = s->streams[0];

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

  2053. 

  2054.     if (mxf->current_edit_unit >= st->duration)

  2055.         return AVERROR_EOF;

  2056. 

  2057.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2058. 

  2059.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2060.         return ret;

  2061. 

  2062.     /* compute size by finding the next edit unit or the end of the essence container

  2063.      * not pretty, but it works */

  2064.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2065.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2066.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2067.         return AVERROR_INVALIDDATA;

  2068.     }

  2069. 

  2070.     if ((size = next_pos - pos) <= 0) {

  2071.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2072.         return AVERROR_INVALIDDATA;

  2073.     }

  2074. 

  2075.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2076.         return ret64;

  2077. 

  2078.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2079.             return ret < 0 ? ret : AVERROR_EOF;

  2080. 

  2081.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2082.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2083.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2084.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2085.     }

  2086. 

  2087.     pkt->stream_index = 0;

  2088.     mxf->current_edit_unit += edit_units;

  2089. 

  2090.     return 0;

  2091. }

  2092. 

  2093. static int mxf_read_close(AVFormatContext *s)

  2094. {

  2095.     MXFContext *mxf = s->priv_data;

  2096.     MXFIndexTableSegment *seg;

  2097.     int i;

  2098. 

  2099.     av_freep(&mxf->packages_refs);

  2100. 

  2101.     for (i = 0; i < s->nb_streams; i++)

  2102.         s->streams[i]->priv_data = NULL;

  2103. 

  2104.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2105.         switch (mxf->metadata_sets[i]->type) {

  2106.         case MultipleDescriptor:

  2107.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2108.             break;

  2109.         case Sequence:

  2110.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2111.             break;

  2112.         case SourcePackage:

  2113.         case MaterialPackage:

  2114.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2115.             break;

  2116.         case IndexTableSegment:

  2117.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2118.             av_freep(&seg->temporal_offset_entries);

  2119.             av_freep(&seg->flag_entries);

  2120.             av_freep(&seg->stream_offset_entries);

  2121.             break;

  2122.         default:

  2123.             break;

  2124.         }

  2125.         av_freep(&mxf->metadata_sets[i]);

  2126.     }

  2127.     av_freep(&mxf->partitions);

  2128.     av_freep(&mxf->metadata_sets);

  2129.     av_freep(&mxf->aesc);

  2130.     av_freep(&mxf->local_tags);

  2131. 

  2132.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2133.         av_freep(&mxf->index_tables[i].segments);

  2134.         av_freep(&mxf->index_tables[i].ptses);

  2135.         av_freep(&mxf->index_tables[i].fake_index);

  2136.     }

  2137.     av_freep(&mxf->index_tables);

  2138. 

  2139.     return 0;

  2140. }

  2141. 

  2142. static int mxf_probe(AVProbeData *p) {

  2143.     uint8_t *bufp = p->buf;

  2144.     uint8_t *end = p->buf + p->buf_size;

  2145. 

  2146.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2147.         return 0;

  2148. 

  2149.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2150.     end -= sizeof(mxf_header_partition_pack_key);

  2151.     for (; bufp < end; bufp++) {

  2152.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2153.             return AVPROBE_SCORE_MAX;

  2154.     }

  2155.     return 0;

  2156. }

  2157. 

  2158. /* rudimentary byte seek */

  2159. /* XXX: use MXF Index */

  2160. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2161. {

  2162.     AVStream *st = s->streams[stream_index];

  2163.     int64_t seconds;

  2164.     MXFContext* mxf = s->priv_data;

  2165.     int64_t seekpos;

  2166.     int ret;

  2167.     MXFIndexTable *t;

  2168. 

  2169.     if (mxf->index_tables <= 0) {

  2170.     if (!s->bit_rate)

  2171.         return AVERROR_INVALIDDATA;

  2172.     if (sample_time < 0)

  2173.         sample_time = 0;

  2174.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2175. 

  2176.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  2177.         return ret;

  2178.     ff_update_cur_dts(s, st, sample_time);

  2179.     } else {

  2180.         t = &mxf->index_tables[0];

  2181. 

  2182.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2183.          * this also means we allow seeking before the start */

  2184.         sample_time = FFMAX(sample_time, 0);

  2185. 

  2186.         if (t->fake_index) {

  2187.             /* behave as if we have a proper index */

  2188.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2189.                 return sample_time;

  2190.         } else {

  2191.             /* no IndexEntryArray (one or more CBR segments)

  2192.              * make sure we don't seek past the end */

  2193.             sample_time = FFMIN(sample_time, st->duration - 1);

  2194.         }

  2195. 

  2196.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2197.             return ret;

  2198. 

  2199.         ff_update_cur_dts(s, st, sample_time);

  2200.         mxf->current_edit_unit = sample_time;

  2201.         avio_seek(s->pb, seekpos, SEEK_SET);

  2202.     }

  2203.     return 0;

  2204. }

  2205. 

  2206. AVInputFormat ff_mxf_demuxer = {

  2207.     .name           = "mxf",

  2208.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  2209.     .priv_data_size = sizeof(MXFContext),

  2210.     .read_probe     = mxf_probe,

  2211.     .read_header    = mxf_read_header,

  2212.     .read_packet    = mxf_read_packet,

  2213.     .read_close     = mxf_read_close,

  2214.     .read_seek      = mxf_read_seek,

  2215. };