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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. #include <inttypes.h>

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a = 1,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

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

  73. } MXFOP;

  74. 

  75. typedef struct {

  76.     int closed;

  77.     int complete;

  78.     MXFPartitionType type;

  79.     uint64_t previous_partition;

  80.     int index_sid;

  81.     int body_sid;

  82.     int64_t this_partition;

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

  84.     int64_t essence_length;

  85.     int32_t kag_size;

  86.     int64_t header_byte_count;

  87.     int64_t index_byte_count;

  88.     int pack_length;

  89. } MXFPartition;

  90. 

  91. typedef struct {

  92.     UID uid;

  93.     enum MXFMetadataSetType type;

  94.     UID source_container_ul;

  95. } MXFCryptoContext;

  96. 

  97. typedef struct {

  98.     UID uid;

  99.     enum MXFMetadataSetType type;

  100.     UID source_package_uid;

  101.     UID data_definition_ul;

  102.     int64_t duration;

  103.     int64_t start_position;

  104.     int source_track_id;

  105. } MXFStructuralComponent;

  106. 

  107. typedef struct {

  108.     UID uid;

  109.     enum MXFMetadataSetType type;

  110.     UID data_definition_ul;

  111.     UID *structural_components_refs;

  112.     int structural_components_count;

  113.     int64_t duration;

  114. } MXFSequence;

  115. 

  116. typedef struct {

  117.     UID uid;

  118.     enum MXFMetadataSetType type;

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

  120.     UID sequence_ref;

  121.     int track_id;

  122.     uint8_t track_number[4];

  123.     AVRational edit_rate;

  124.     int intra_only;

  125.     uint64_t sample_count;

  126.     int64_t original_duration; /* st->duration in SampleRate/EditRate units */

  127. } MXFTrack;

  128. 

  129. typedef struct {

  130.     UID uid;

  131.     enum MXFMetadataSetType type;

  132.     UID essence_container_ul;

  133.     UID essence_codec_ul;

  134.     AVRational sample_rate;

  135.     AVRational aspect_ratio;

  136.     int width;

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

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

  139. #define MXF_TFF 1

  140. #define MXF_BFF 2

  141.     int field_dominance;

  142.     int channels;

  143.     int bits_per_sample;

  144.     unsigned int component_depth;

  145.     unsigned int horiz_subsampling;

  146.     unsigned int vert_subsampling;

  147.     UID *sub_descriptors_refs;

  148.     int sub_descriptors_count;

  149.     int linked_track_id;

  150.     uint8_t *extradata;

  151.     int extradata_size;

  152.     enum AVPixelFormat pix_fmt;

  153. } MXFDescriptor;

  154. 

  155. typedef struct {

  156.     UID uid;

  157.     enum MXFMetadataSetType type;

  158.     int edit_unit_byte_count;

  159.     int index_sid;

  160.     int body_sid;

  161.     AVRational index_edit_rate;

  162.     uint64_t index_start_position;

  163.     uint64_t index_duration;

  164.     int8_t *temporal_offset_entries;

  165.     int *flag_entries;

  166.     uint64_t *stream_offset_entries;

  167.     int nb_index_entries;

  168. } MXFIndexTableSegment;

  169. 

  170. typedef struct {

  171.     UID uid;

  172.     enum MXFMetadataSetType type;

  173.     UID package_uid;

  174.     UID *tracks_refs;

  175.     int tracks_count;

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

  177.     UID descriptor_ref;

  178. } MXFPackage;

  179. 

  180. typedef struct {

  181.     UID uid;

  182.     enum MXFMetadataSetType type;

  183. } MXFMetadataSet;

  184. 

  185. /* decoded index table */

  186. typedef struct {

  187.     int index_sid;

  188.     int body_sid;

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

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

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

  192.     int nb_segments;

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

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

  195. } MXFIndexTable;

  196. 

  197. typedef struct {

  198.     MXFPartition *partitions;

  199.     unsigned partitions_count;

  200.     MXFOP op;

  201.     UID *packages_refs;

  202.     int packages_count;

  203.     MXFMetadataSet **metadata_sets;

  204.     int metadata_sets_count;

  205.     AVFormatContext *fc;

  206.     struct AVAES *aesc;

  207.     uint8_t *local_tags;

  208.     int local_tags_count;

  209.     uint64_t last_partition;

  210.     uint64_t footer_partition;

  211.     KLVPacket current_klv_data;

  212.     int current_klv_index;

  213.     int run_in;

  214.     MXFPartition *current_partition;

  215.     int parsing_backward;

  216.     int64_t last_forward_tell;

  217.     int last_forward_partition;

  218.     int current_edit_unit;

  219.     int nb_index_tables;

  220.     MXFIndexTable *index_tables;

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

  222. } MXFContext;

  223. 

  224. enum MXFWrappingScheme {

  225.     Frame,

  226.     Clip,

  227. };

  228. 

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

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

  231. 

  232. typedef struct {

  233.     const UID key;

  234.     MXFMetadataReadFunc *read;

  235.     int ctx_size;

  236.     enum MXFMetadataSetType type;

  237. } MXFMetadataReadTableEntry;

  238. 

  239. /* partial keys to match */

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

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

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

  243. static const uint8_t mxf_system_item_key[]                 = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x03,0x01,0x04 };

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

  245. /* complete keys to match */

  246. 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 };

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

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

  249. static const uint8_t mxf_random_index_pack_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };

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

  251. 

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

  253. 

  254. static int64_t klv_decode_ber_length(AVIOContext *pb)

  255. {

  256.     uint64_t size = avio_r8(pb);

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

  258.         int bytes_num = size & 0x7f;

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

  260.         if (bytes_num > 8)

  261.             return AVERROR_INVALIDDATA;

  262.         size = 0;

  263.         while (bytes_num--)

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

  265.     }

  266.     return size;

  267. }

  268. 

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

  270. {

  271.     int i, b;

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

  273.         b = avio_r8(pb);

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

  275.             i = 0;

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

  277.             i = -1;

  278.     }

  279.     return i == size;

  280. }

  281. 

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

  283. {

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

  285.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  291. }

  292. 

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

  294. {

  295.     int i;

  296. 

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

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

  299.         /* SMPTE 379M 7.3 */

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

  301.             return i;

  302.     }

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

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

  305. }

  306. 

  307. /* XXX: use AVBitStreamFilter */

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

  309. {

  310.     const uint8_t *buf_ptr, *end_ptr;

  311.     uint8_t *data_ptr;

  312.     int i;

  313. 

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

  315.         return AVERROR_INVALIDDATA;

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

  317.     if (length < 0)

  318.         return length;

  319.     data_ptr = pkt->data;

  320.     end_ptr = pkt->data + length;

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

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

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

  324.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  327.             else

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

  329.         }

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

  331.     }

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

  333.     return 0;

  334. }

  335. 

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

  337. {

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

  339.     MXFContext *mxf = s->priv_data;

  340.     AVIOContext *pb = s->pb;

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

  342.     int64_t size;

  343.     uint64_t orig_size;

  344.     uint64_t plaintext_size;

  345.     uint8_t ivec[16];

  346.     uint8_t tmpbuf[16];

  347.     int index;

  348. 

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

  350.         mxf->aesc = av_aes_alloc();

  351.         if (!mxf->aesc)

  352.             return AVERROR(ENOMEM);

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

  354.     }

  355.     // crypto context

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

  357.     // plaintext offset

  358.     klv_decode_ber_length(pb);

  359.     plaintext_size = avio_rb64(pb);

  360.     // source klv key

  361.     klv_decode_ber_length(pb);

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

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

  364.         return AVERROR_INVALIDDATA;

  365.     index = mxf_get_stream_index(s, klv);

  366.     if (index < 0)

  367.         return AVERROR_INVALIDDATA;

  368.     // source size

  369.     klv_decode_ber_length(pb);

  370.     orig_size = avio_rb64(pb);

  371.     if (orig_size < plaintext_size)

  372.         return AVERROR_INVALIDDATA;

  373.     // enc. code

  374.     size = klv_decode_ber_length(pb);

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

  376.         return AVERROR_INVALIDDATA;

  377.     avio_read(pb, ivec, 16);

  378.     avio_read(pb, tmpbuf, 16);

  379.     if (mxf->aesc)

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

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

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

  383.     size -= 32;

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

  385.     if (size < 0)

  386.         return size;

  387.     else if (size < plaintext_size)

  388.         return AVERROR_INVALIDDATA;

  389.     size -= plaintext_size;

  390.     if (mxf->aesc)

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

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

  393.     av_shrink_packet(pkt, orig_size);

  394.     pkt->stream_index = index;

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

  396.     return 0;

  397. }

  398. 

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

  400. {

  401.     MXFContext *mxf = arg;

  402.     int item_num = avio_rb32(pb);

  403.     int item_len = avio_rb32(pb);

  404. 

  405.     if (item_len != 18) {

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

  407.         return AVERROR_PATCHWELCOME;

  408.     }

  409.     if (item_num > UINT_MAX / item_len)

  410.         return AVERROR_INVALIDDATA;

  411.     mxf->local_tags_count = item_num;

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

  413.     if (!mxf->local_tags)

  414.         return AVERROR(ENOMEM);

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

  416.     return 0;

  417. }

  418. 

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

  420. {

  421.     MXFContext *mxf = arg;

  422.     MXFPartition *partition;

  423.     UID op;

  424.     uint64_t footer_partition;

  425.     uint32_t nb_essence_containers;

  426.     int err;

  427. 

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

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

  430.         mxf->partitions_count = 0;

  431.         return err;

  432.     }

  433. 

  434.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  441.     } else {

  442.         mxf->last_forward_partition++;

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

  444.     }

  445. 

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

  447.     mxf->partitions_count++;

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

  449. 

  450.     switch(uid[13]) {

  451.     case 2:

  452.         partition->type = Header;

  453.         break;

  454.     case 3:

  455.         partition->type = BodyPartition;

  456.         break;

  457.     case 4:

  458.         partition->type = Footer;

  459.         break;

  460.     default:

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

  462.         return AVERROR_INVALIDDATA;

  463.     }

  464. 

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

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

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

  468.     avio_skip(pb, 4);

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

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

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

  472.     footer_partition = avio_rb64(pb);

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

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

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

  476.     avio_skip(pb, 8);

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

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

  479.     nb_essence_containers = avio_rb32(pb);

  480. 

  481.     if (partition->this_partition &&

  482.         partition->previous_partition == partition->this_partition) {

  483.         av_log(mxf->fc, AV_LOG_ERROR,

  484.                "PreviousPartition equal to ThisPartition %"PRIx64"\n",

  485.                partition->previous_partition);

  486.         /* override with the actual previous partition offset */

  487.         if (!mxf->parsing_backward && mxf->last_forward_partition > 1) {

  488.             MXFPartition *prev =

  489.                 mxf->partitions + mxf->last_forward_partition - 2;

  490.             partition->previous_partition = prev->this_partition;

  491.         }

  492.         /* if no previous body partition are found point to the header

  493.          * partition */

  494.         if (partition->previous_partition == partition->this_partition)

  495.             partition->previous_partition = 0;

  496.         av_log(mxf->fc, AV_LOG_ERROR,

  497.                "Overriding PreviousPartition with %"PRIx64"\n",

  498.                partition->previous_partition);

  499.     }

  500. 

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

  502.     if (footer_partition) {

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

  504.             av_log(mxf->fc, AV_LOG_ERROR,

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

  506.                    mxf->footer_partition, footer_partition);

  507.         } else {

  508.             mxf->footer_partition = footer_partition;

  509.         }

  510.     }

  511. 

  512.     av_dlog(mxf->fc,

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

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

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

  516.             partition->this_partition,

  517.             partition->previous_partition, footer_partition,

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

  519. 

  520.     /* sanity check PreviousPartition if set */

  521.     if (partition->previous_partition &&

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

  523.         av_log(mxf->fc, AV_LOG_ERROR,

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

  525.         return AVERROR_INVALIDDATA;

  526.     }

  527. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  541.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  543.         if (nb_essence_containers != 1) {

  544.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  545. 

  546.             /* only nag once */

  547.             if (!mxf->op)

  548.                 av_log(mxf->fc, AV_LOG_WARNING,

  549.                        "\"OPAtom\" with %"PRIu32" ECs - assuming %s\n",

  550.                        nb_essence_containers,

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

  552. 

  553.             mxf->op = op;

  554.         } else

  555.             mxf->op = OPAtom;

  556.     } else {

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

  558.         mxf->op = OP1a;

  559.     }

  560. 

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

  562.         av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %"PRId32" - guessing ",

  563.                partition->kag_size);

  564. 

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

  566.             partition->kag_size = 512;

  567.         else

  568.             partition->kag_size = 1;

  569. 

  570.         av_log(mxf->fc, AV_LOG_WARNING, "%"PRId32"\n", partition->kag_size);

  571.     }

  572. 

  573.     return 0;

  574. }

  575. 

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

  577. {

  578.     int err;

  579. 

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

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

  582.         mxf->metadata_sets_count = 0;

  583.         return err;

  584.     }

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

  586.     mxf->metadata_sets_count++;

  587.     return 0;

  588. }

  589. 

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

  591. {

  592.     MXFCryptoContext *cryptocontext = arg;

  593.     if (size != 16)

  594.         return AVERROR_INVALIDDATA;

  595.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  597.     return 0;

  598. }

  599. 

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

  601. {

  602.     MXFContext *mxf = arg;

  603.     switch (tag) {

  604.     case 0x1901:

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

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

  607.             return AVERROR_INVALIDDATA;

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

  609.         if (!mxf->packages_refs)

  610.             return AVERROR(ENOMEM);

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

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

  613.         break;

  614.     }

  615.     return 0;

  616. }

  617. 

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

  619. {

  620.     MXFStructuralComponent *source_clip = arg;

  621.     switch(tag) {

  622.     case 0x0202:

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

  624.         break;

  625.     case 0x1201:

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

  627.         break;

  628.     case 0x1101:

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

  630.         avio_skip(pb, 16);

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

  632.         break;

  633.     case 0x1102:

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

  635.         break;

  636.     }

  637.     return 0;

  638. }

  639. 

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

  641. {

  642.     MXFPackage *package = arg;

  643.     switch(tag) {

  644.     case 0x4403:

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

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

  647.             return AVERROR_INVALIDDATA;

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

  649.         if (!package->tracks_refs)

  650.             return AVERROR(ENOMEM);

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

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

  653.         break;

  654.     }

  655.     return 0;

  656. }

  657. 

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

  659. {

  660.     MXFTrack *track = arg;

  661.     switch(tag) {

  662.     case 0x4801:

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

  664.         break;

  665.     case 0x4804:

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

  667.         break;

  668.     case 0x4b01:

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

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

  671.         break;

  672.     case 0x4803:

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

  674.         break;

  675.     }

  676.     return 0;

  677. }

  678. 

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

  680. {

  681.     MXFSequence *sequence = arg;

  682.     switch(tag) {

  683.     case 0x0202:

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

  685.         break;

  686.     case 0x0201:

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

  688.         break;

  689.     case 0x1001:

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

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

  692.             return AVERROR_INVALIDDATA;

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

  694.         if (!sequence->structural_components_refs)

  695.             return AVERROR(ENOMEM);

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

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

  698.         break;

  699.     }

  700.     return 0;

  701. }

  702. 

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

  704. {

  705.     MXFPackage *package = arg;

  706.     switch(tag) {

  707.     case 0x4403:

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

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

  710.             return AVERROR_INVALIDDATA;

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

  712.         if (!package->tracks_refs)

  713.             return AVERROR(ENOMEM);

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

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

  716.         break;

  717.     case 0x4401:

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

  719.         avio_skip(pb, 16);

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

  721.         break;

  722.     case 0x4701:

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

  724.         break;

  725.     }

  726.     return 0;

  727. }

  728. 

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

  730. {

  731.     int i, length;

  732. 

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

  734.     if (!segment->nb_index_entries)

  735.         return 0;

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

  737.              segment->nb_index_entries >

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

  739.         return AVERROR(ENOMEM);

  740. 

  741.     length = avio_rb32(pb);

  742. 

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

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

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

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

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

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

  749. 

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

  751.         !segment->temporal_offset_entries) {

  752.         av_freep(&segment->flag_entries);

  753.         av_freep(&segment->stream_offset_entries);

  754.         av_freep(&segment->temporal_offset_entries);

  755.         return AVERROR(ENOMEM);

  756.     }

  757. 

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

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

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

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

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

  763.         avio_skip(pb, length - 11);

  764.     }

  765.     return 0;

  766. }

  767. 

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

  769. {

  770.     MXFIndexTableSegment *segment = arg;

  771.     switch(tag) {

  772.     case 0x3F05:

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

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

  775.         break;

  776.     case 0x3F06:

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

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

  779.         break;

  780.     case 0x3F07:

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

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

  783.         break;

  784.     case 0x3F0A:

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

  786.         return mxf_read_index_entry_array(pb, segment);

  787.     case 0x3F0B:

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

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

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

  791.                 segment->index_edit_rate.den);

  792.         break;

  793.     case 0x3F0C:

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

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

  796.         break;

  797.     case 0x3F0D:

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

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

  800.         break;

  801.     }

  802.     return 0;

  803. }

  804. 

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

  806. {

  807.     int code, value, ofs = 0;

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

  809. 

  810.     do {

  811.         code = avio_r8(pb);

  812.         value = avio_r8(pb);

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

  814. 

  815.         if (ofs < 16) {

  816.             layout[ofs++] = code;

  817.             layout[ofs++] = value;

  818.         }

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

  820. 

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

  822. }

  823. 

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

  825. {

  826.     MXFDescriptor *descriptor = arg;

  827.     descriptor->pix_fmt = AV_PIX_FMT_NONE;

  828.     switch(tag) {

  829.     case 0x3F01:

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

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

  832.             return AVERROR_INVALIDDATA;

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

  834.         if (!descriptor->sub_descriptors_refs)

  835.             return AVERROR(ENOMEM);

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

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

  838.         break;

  839.     case 0x3004:

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

  841.         break;

  842.     case 0x3006:

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

  844.         break;

  845.     case 0x3201: /* PictureEssenceCoding */

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

  847.         break;

  848.     case 0x3203:

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

  850.         break;

  851.     case 0x3202:

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

  853.         break;

  854.     case 0x320C:

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

  856.         break;

  857.     case 0x320E:

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

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

  860.         break;

  861.     case 0x3212:

  862.         descriptor->field_dominance = avio_r8(pb);

  863.         break;

  864.     case 0x3301:

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

  866.         break;

  867.     case 0x3302:

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

  869.         break;

  870.     case 0x3308:

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

  872.         break;

  873.     case 0x3D03:

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

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

  876.         break;

  877.     case 0x3D06: /* SoundEssenceCompression */

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

  879.         break;

  880.     case 0x3D07:

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

  882.         break;

  883.     case 0x3D01:

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

  885.         break;

  886.     case 0x3401:

  887.         mxf_read_pixel_layout(pb, descriptor);

  888.         break;

  889.     default:

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

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

  892.             av_free(descriptor->extradata);

  893.             descriptor->extradata_size = 0;

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

  895.             if (!descriptor->extradata)

  896.                 return AVERROR(ENOMEM);

  897.             descriptor->extradata_size = size;

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

  899.         }

  900.         break;

  901.     }

  902.     return 0;

  903. }

  904. 

  905. /*

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

  907.  * Returns: boolean

  908.  */

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

  910. {

  911.     int i;

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

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

  914.             return 0;

  915.     }

  916.     return 1;

  917. }

  918. 

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

  920. {

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

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

  923.             break;

  924.         uls++;

  925.     }

  926.     return uls;

  927. }

  928. 

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

  930. {

  931.     int i;

  932. 

  933.     if (!strong_ref)

  934.         return NULL;

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

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

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

  938.             return mxf->metadata_sets[i];

  939.         }

  940.     }

  941.     return NULL;

  942. }

  943. 

  944. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  945.     // video essence container uls

  946.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  947.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  948.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  949.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  950. };

  951. 

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

  953. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  954.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  955.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  956. };

  957. 

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

  959. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  960.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  961.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */

  962.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  963. };

  964. 

  965. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  966.     // sound essence container uls

  967.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  968.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  969.     { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  970.     { { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0xff,0x4b,0x46,0x41,0x41,0x00,0x0d,0x4d,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  971.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  972. };

  973. 

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

  975. {

  976.     int i, j, nb_segments = 0;

  977.     MXFIndexTableSegment **unsorted_segments;

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

  979. 

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

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

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

  983.             nb_segments++;

  984. 

  985.     if (!nb_segments)

  986.         return AVERROR_INVALIDDATA;

  987. 

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

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

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

  991.         av_freep(sorted_segments);

  992.         av_free(unsorted_segments);

  993.         return AVERROR(ENOMEM);

  994.     }

  995. 

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

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

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

  999. 

  1000.     *nb_sorted_segments = 0;

  1001. 

  1002.     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */

  1003.     for (i = 0; i < nb_segments; i++) {

  1004.         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;

  1005.         uint64_t best_index_duration = 0;

  1006. 

  1007.         for (j = 0; j < nb_segments; j++) {

  1008.             MXFIndexTableSegment *s = unsorted_segments[j];

  1009. 

  1010.             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.

  1011.              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.

  1012.              * If we come across an entry with the same IndexStartPosition but larger IndexDuration, then we'll prefer it over the one we currently have.

  1013.              */

  1014.             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&

  1015.                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start ||

  1016.                 (s->index_start_position == best_index_start && s->index_duration > best_index_duration))) {

  1017.                 best             = j;

  1018.                 best_body_sid    = s->body_sid;

  1019.                 best_index_sid   = s->index_sid;

  1020.                 best_index_start = s->index_start_position;

  1021.                 best_index_duration = s->index_duration;

  1022.             }

  1023.         }

  1024. 

  1025.         /* no suitable entry found -> we're done */

  1026.         if (best == -1)

  1027.             break;

  1028. 

  1029.         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];

  1030.         last_body_sid    = best_body_sid;

  1031.         last_index_sid   = best_index_sid;

  1032.         last_index_start = best_index_start;

  1033.     }

  1034. 

  1035.     av_free(unsorted_segments);

  1036. 

  1037.     return 0;

  1038. }

  1039. 

  1040. /**

  1041.  * Computes the absolute file offset of the given essence container offset

  1042.  */

  1043. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1044. {

  1045.     int x;

  1046.     int64_t offset_in = offset;     /* for logging */

  1047. 

  1048.     for (x = 0; x < mxf->partitions_count; x++) {

  1049.         MXFPartition *p = &mxf->partitions[x];

  1050. 

  1051.         if (p->body_sid != body_sid)

  1052.             continue;

  1053. 

  1054.         if (offset < p->essence_length || !p->essence_length) {

  1055.             *offset_out = p->essence_offset + offset;

  1056.             return 0;

  1057.         }

  1058. 

  1059.         offset -= p->essence_length;

  1060.     }

  1061. 

  1062.     av_log(mxf->fc, AV_LOG_ERROR,

  1063.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1064.            offset_in, body_sid);

  1065. 

  1066.     return AVERROR_INVALIDDATA;

  1067. }

  1068. 

  1069. /**

  1070.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1071.  */

  1072. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1073. {

  1074.     int x;

  1075.     int64_t ret = 0;

  1076. 

  1077.     for (x = 0; x < mxf->partitions_count; x++) {

  1078.         MXFPartition *p = &mxf->partitions[x];

  1079. 

  1080.         if (p->body_sid != body_sid)

  1081.             continue;

  1082. 

  1083.         if (!p->essence_length)

  1084.             return 0;

  1085. 

  1086.         ret = p->essence_offset + p->essence_length;

  1087.     }

  1088. 

  1089.     return ret;

  1090. }

  1091. 

  1092. /* EditUnit -> absolute offset */

  1093. 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)

  1094. {

  1095.     int i;

  1096.     int64_t offset_temp = 0;

  1097. 

  1098.     for (i = 0; i < index_table->nb_segments; i++) {

  1099.         MXFIndexTableSegment *s = index_table->segments[i];

  1100. 

  1101.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1102. 

  1103.         if (edit_unit < s->index_start_position + s->index_duration) {

  1104.             int64_t index = edit_unit - s->index_start_position;

  1105. 

  1106.             if (s->edit_unit_byte_count)

  1107.                 offset_temp += s->edit_unit_byte_count * index;

  1108.             else if (s->nb_index_entries) {

  1109.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1110.                     index *= 2;     /* Avid index */

  1111. 

  1112.                 if (index < 0 || index >= s->nb_index_entries) {

  1113.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1114.                            index_table->index_sid, s->index_start_position);

  1115.                     return AVERROR_INVALIDDATA;

  1116.                 }

  1117. 

  1118.                 offset_temp = s->stream_offset_entries[index];

  1119.             } else {

  1120.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1121.                        index_table->index_sid, s->index_start_position);

  1122.                 return AVERROR_INVALIDDATA;

  1123.             }

  1124. 

  1125.             if (edit_unit_out)

  1126.                 *edit_unit_out = edit_unit;

  1127. 

  1128.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1129.         } else {

  1130.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1131.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1132.         }

  1133.     }

  1134. 

  1135.     if (nag)

  1136.         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);

  1137. 

  1138.     return AVERROR_INVALIDDATA;

  1139. }

  1140. 

  1141. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1142. {

  1143.     int i, j, x;

  1144.     int8_t max_temporal_offset = -128;

  1145. 

  1146.     /* first compute how many entries we have */

  1147.     for (i = 0; i < index_table->nb_segments; i++) {

  1148.         MXFIndexTableSegment *s = index_table->segments[i];

  1149. 

  1150.         if (!s->nb_index_entries) {

  1151.             index_table->nb_ptses = 0;

  1152.             return 0;                               /* no TemporalOffsets */

  1153.         }

  1154. 

  1155.         index_table->nb_ptses += s->index_duration;

  1156.     }

  1157. 

  1158.     /* paranoid check */

  1159.     if (index_table->nb_ptses <= 0)

  1160.         return 0;

  1161. 

  1162.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1163.         return AVERROR(ENOMEM);

  1164. 

  1165.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1166.                                          sizeof(int64_t));

  1167.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1168.                                          sizeof(AVIndexEntry));

  1169.     if (!index_table->ptses || !index_table->fake_index) {

  1170.         av_freep(&index_table->ptses);

  1171.         return AVERROR(ENOMEM);

  1172.     }

  1173. 

  1174.     /* we may have a few bad TemporalOffsets

  1175.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1176.     for (x = 0; x < index_table->nb_ptses; x++)

  1177.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1178. 

  1179.     /**

  1180.      * We have this:

  1181.      *

  1182.      * x  TemporalOffset

  1183.      * 0:  0

  1184.      * 1:  1

  1185.      * 2:  1

  1186.      * 3: -2

  1187.      * 4:  1

  1188.      * 5:  1

  1189.      * 6: -2

  1190.      *

  1191.      * We want to transform it into this:

  1192.      *

  1193.      * x  DTS PTS

  1194.      * 0: -1   0

  1195.      * 1:  0   3

  1196.      * 2:  1   1

  1197.      * 3:  2   2

  1198.      * 4:  3   6

  1199.      * 5:  4   4

  1200.      * 6:  5   5

  1201.      *

  1202.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1203.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1204.      * The latter makes DTS <= PTS.

  1205.      */

  1206.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1207.         MXFIndexTableSegment *s = index_table->segments[i];

  1208.         int index_delta = 1;

  1209.         int n = s->nb_index_entries;

  1210. 

  1211.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1212.             index_delta = 2;    /* Avid index */

  1213.             /* ignore the last entry - it's the size of the essence container */

  1214.             n--;

  1215.         }

  1216. 

  1217.         for (j = 0; j < n; j += index_delta, x++) {

  1218.             int offset = s->temporal_offset_entries[j] / index_delta;

  1219.             int index  = x + offset;

  1220. 

  1221.             if (x >= index_table->nb_ptses) {

  1222.                 av_log(mxf->fc, AV_LOG_ERROR,

  1223.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1224.                        s->nb_index_entries, s->index_duration);

  1225.                 break;

  1226.             }

  1227. 

  1228.             index_table->fake_index[x].timestamp = x;

  1229.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1230. 

  1231.             if (index < 0 || index >= index_table->nb_ptses) {

  1232.                 av_log(mxf->fc, AV_LOG_ERROR,

  1233.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1234.                        x, offset, index);

  1235.                 continue;

  1236.             }

  1237. 

  1238.             index_table->ptses[index] = x;

  1239.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1240.         }

  1241.     }

  1242. 

  1243.     index_table->first_dts = -max_temporal_offset;

  1244. 

  1245.     return 0;

  1246. }

  1247. 

  1248. /**

  1249.  * Sorts and collects index table segments into index tables.

  1250.  * Also computes PTSes if possible.

  1251.  */

  1252. static int mxf_compute_index_tables(MXFContext *mxf)

  1253. {

  1254.     int i, j, k, ret, nb_sorted_segments;

  1255.     MXFIndexTableSegment **sorted_segments = NULL;

  1256. 

  1257.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1258.         nb_sorted_segments <= 0) {

  1259.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1260.         return 0;

  1261.     }

  1262. 

  1263.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1264.     for (i = 0; i < nb_sorted_segments; i++) {

  1265.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1266.             mxf->nb_index_tables++;

  1267.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1268.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1269.             ret = AVERROR_INVALIDDATA;

  1270.             goto finish_decoding_index;

  1271.         }

  1272.     }

  1273. 

  1274.     mxf->index_tables = av_mallocz_array(mxf->nb_index_tables,

  1275.                                          sizeof(*mxf->index_tables));

  1276.     if (!mxf->index_tables) {

  1277.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1278.         ret = AVERROR(ENOMEM);

  1279.         goto finish_decoding_index;

  1280.     }

  1281. 

  1282.     /* distribute sorted segments to index tables */

  1283.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1284.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1285.             /* next IndexSID */

  1286.             j++;

  1287.         }

  1288. 

  1289.         mxf->index_tables[j].nb_segments++;

  1290.     }

  1291. 

  1292.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1293.         MXFIndexTable *t = &mxf->index_tables[j];

  1294. 

  1295.         t->segments = av_mallocz_array(t->nb_segments,

  1296.                                        sizeof(*t->segments));

  1297. 

  1298.         if (!t->segments) {

  1299.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1300.                    " pointer array\n");

  1301.             ret = AVERROR(ENOMEM);

  1302.             goto finish_decoding_index;

  1303.         }

  1304. 

  1305.         if (sorted_segments[i]->index_start_position)

  1306.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1307.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1308. 

  1309.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1310.         t->index_sid = sorted_segments[i]->index_sid;

  1311.         t->body_sid = sorted_segments[i]->body_sid;

  1312. 

  1313.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1314.             goto finish_decoding_index;

  1315. 

  1316.         /* fix zero IndexDurations */

  1317.         for (k = 0; k < t->nb_segments; k++) {

  1318.             if (t->segments[k]->index_duration)

  1319.                 continue;

  1320. 

  1321.             if (t->nb_segments > 1)

  1322.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1323.                        t->index_sid, k);

  1324. 

  1325.             if (mxf->fc->nb_streams <= 0) {

  1326.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1327.                 break;

  1328.             }

  1329. 

  1330.             /* assume the first stream's duration is reasonable

  1331.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1332.              */

  1333.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1334.             break;

  1335.         }

  1336.     }

  1337. 

  1338.     ret = 0;

  1339. finish_decoding_index:

  1340.     av_free(sorted_segments);

  1341.     return ret;

  1342. }

  1343. 

  1344. static int mxf_is_intra_only(MXFDescriptor *d)

  1345. {

  1346.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1347.                             &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||

  1348.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1349.                             &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;

  1350. }

  1351. 

  1352. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1353. {

  1354.     MXFPackage *material_package = NULL;

  1355.     MXFPackage *temp_package = NULL;

  1356.     int i, j, k, ret;

  1357. 

  1358.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1359.     /* TODO: handle multiple material packages (OP3x) */

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

  1361.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1362.         if (material_package) break;

  1363.     }

  1364.     if (!material_package) {

  1365.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1366.         return AVERROR_INVALIDDATA;

  1367.     }

  1368. 

  1369.     for (i = 0; i < material_package->tracks_count; i++) {

  1370.         MXFPackage *source_package = NULL;

  1371.         MXFTrack *material_track = NULL;

  1372.         MXFTrack *source_track = NULL;

  1373.         MXFTrack *temp_track = NULL;

  1374.         MXFDescriptor *descriptor = NULL;

  1375.         MXFStructuralComponent *component = NULL;

  1376.         UID *essence_container_ul = NULL;

  1377.         const MXFCodecUL *codec_ul = NULL;

  1378.         const MXFCodecUL *container_ul = NULL;

  1379.         const MXFCodecUL *pix_fmt_ul = NULL;

  1380.         AVStream *st;

  1381. 

  1382.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1383.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1384.             continue;

  1385.         }

  1386. 

  1387.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1388.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1389.             continue;

  1390.         }

  1391. 

  1392.         /* TODO: handle multiple source clips */

  1393.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1394.             /* TODO: handle timecode component */

  1395.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1396.             if (!component)

  1397.                 continue;

  1398. 

  1399.             for (k = 0; k < mxf->packages_count; k++) {

  1400.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1401.                 if (!temp_package)

  1402.                     continue;

  1403.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1404.                     source_package = temp_package;

  1405.                     break;

  1406.                 }

  1407.             }

  1408.             if (!source_package) {

  1409.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1410.                 break;

  1411.             }

  1412.             for (k = 0; k < source_package->tracks_count; k++) {

  1413.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1414.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1415.                     ret = AVERROR_INVALIDDATA;

  1416.                     goto fail_and_free;

  1417.                 }

  1418.                 if (temp_track->track_id == component->source_track_id) {

  1419.                     source_track = temp_track;

  1420.                     break;

  1421.                 }

  1422.             }

  1423.             if (!source_track) {

  1424.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1425.                 break;

  1426.             }

  1427.         }

  1428.         if (!source_track || !component)

  1429.             continue;

  1430. 

  1431.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

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

  1433.             ret = AVERROR_INVALIDDATA;

  1434.             goto fail_and_free;

  1435.         }

  1436. 

  1437.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1438.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1439.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1440.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1441.             continue;

  1442.         }

  1443. 

  1444.         st = avformat_new_stream(mxf->fc, NULL);

  1445.         if (!st) {

  1446.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1447.             ret = AVERROR(ENOMEM);

  1448.             goto fail_and_free;

  1449.         }

  1450.         st->id = source_track->track_id;

  1451.         st->priv_data = source_track;

  1452.         source_track->original_duration = st->duration = component->duration;

  1453.         if (st->duration == -1)

  1454.             st->duration = AV_NOPTS_VALUE;

  1455.         st->start_time = component->start_position;

  1456.         if (material_track->edit_rate.num <= 0 ||

  1457.             material_track->edit_rate.den <= 0) {

  1458.             av_log(mxf->fc, AV_LOG_WARNING,

  1459.                    "Invalid edit rate (%d/%d) found on stream #%d, "

  1460.                    "defaulting to 25/1\n",

  1461.                    material_track->edit_rate.num,

  1462.                    material_track->edit_rate.den, st->index);

  1463.             material_track->edit_rate = (AVRational){25, 1};

  1464.         }

  1465.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1466. 

  1467.         /* ensure SourceTrack EditRate == MaterialTrack EditRate since only

  1468.          * the former is accessible via st->priv_data */

  1469.         source_track->edit_rate = material_track->edit_rate;

  1470. 

  1471.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1472.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1473.         st->codec->codec_type = codec_ul->id;

  1474. 

  1475.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1476.         if (source_package->descriptor) {

  1477.             if (source_package->descriptor->type == MultipleDescriptor) {

  1478.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1479.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1480. 

  1481.                     if (!sub_descriptor) {

  1482.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1483.                         continue;

  1484.                     }

  1485.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1486.                         descriptor = sub_descriptor;

  1487.                         break;

  1488.                     }

  1489.                 }

  1490.             } else if (source_package->descriptor->type == Descriptor)

  1491.                 descriptor = source_package->descriptor;

  1492.         }

  1493.         if (!descriptor) {

  1494.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1495.             continue;

  1496.         }

  1497.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1498.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1499.         essence_container_ul = &descriptor->essence_container_ul;

  1500.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1501.          * is not allowed according to s429-6, try to find correct information anyway */

  1502.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1503.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1504.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1505.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1506.                 if (metadata->type == CryptoContext) {

  1507.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1508.                     break;

  1509.                 }

  1510.             }

  1511.         }

  1512. 

  1513.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1514.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1515.         st->codec->codec_id = codec_ul->id;

  1516. 

  1517.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1518.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1519.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1520.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1521.                 st->codec->codec_id = container_ul->id;

  1522.             st->codec->width = descriptor->width;

  1523.             /* Field height, not frame height */

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

  1525.             switch (descriptor->frame_layout) {

  1526.                 case SegmentedFrame:

  1527.                     /* This one is a weird layout I don't fully understand. */

  1528.                     av_log(mxf->fc, AV_LOG_INFO,

  1529.                            "SegmentedFrame layout isn't currently supported\n");

  1530.                     break;

  1531.                 case FullFrame:

  1532.                     st->codec->field_order = AV_FIELD_PROGRESSIVE;

  1533.                     break;

  1534.                 case OneField:

  1535.                     /* Every other line is stored and needs to be duplicated. */

  1536.                     av_log(mxf->fc, AV_LOG_INFO,

  1537.                            "OneField frame layout isn't currently supported\n");

  1538.                     break;

  1539.                     /* The correct thing to do here is fall through, but by

  1540.                      * breaking we might be able to decode some streams at half

  1541.                      * the vertical resolution, rather than not al all.

  1542.                      * It's also for compatibility with the old behavior. */

  1543.                 case SeparateFields:

  1544.                 case MixedFields:

  1545.                     switch (descriptor->field_dominance) {

  1546.                     case MXF_TFF:

  1547.                         st->codec->field_order = AV_FIELD_TT;

  1548.                         break;

  1549.                     case MXF_BFF:

  1550.                         st->codec->field_order = AV_FIELD_BB;

  1551.                         break;

  1552.                     default:

  1553.                         avpriv_request_sample(mxf->fc,

  1554.                                               "Field dominance %d support",

  1555.                                               descriptor->field_dominance);

  1556.                         break;

  1557.                     }

  1558.                     /* Turn field height into frame height. */

  1559.                     st->codec->height *= 2;

  1560.                 default:

  1561.                     av_log(mxf->fc, AV_LOG_INFO,

  1562.                            "Unknown frame layout type: %d\n",

  1563.                            descriptor->frame_layout);

  1564.             }

  1565.             if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {

  1566.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1567.                 if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1568.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,

  1569.                                                   &descriptor->essence_codec_ul);

  1570.                     st->codec->pix_fmt = pix_fmt_ul->id;

  1571.                     if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1572.                         /* support files created before RP224v10 by defaulting to UYVY422

  1573.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1574.                         if (descriptor->horiz_subsampling == 2 &&

  1575.                             descriptor->vert_subsampling == 1 &&

  1576.                             descriptor->component_depth == 8) {

  1577.                             st->codec->pix_fmt = AV_PIX_FMT_UYVY422;

  1578.                         }

  1579.                     }

  1580.                 }

  1581.             }

  1582.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1583.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1584.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1585.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1586.                 st->codec->codec_id = container_ul->id;

  1587.             st->codec->channels = descriptor->channels;

  1588.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1589. 

  1590.             if (descriptor->sample_rate.den > 0) {

  1591.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1592.                 avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);

  1593.             } else {

  1594.                 av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "

  1595.                        "found for stream #%d, time base forced to 1/48000\n",

  1596.                        descriptor->sample_rate.num, descriptor->sample_rate.den,

  1597.                        st->index);

  1598.                 avpriv_set_pts_info(st, 64, 1, 48000);

  1599.             }

  1600. 

  1601.             /* if duration is set, rescale it from EditRate to SampleRate */

  1602.             if (st->duration != AV_NOPTS_VALUE)

  1603.                 st->duration = av_rescale_q(st->duration,

  1604.                                             av_inv_q(material_track->edit_rate),

  1605.                                             st->time_base);

  1606. 

  1607.             /* TODO: implement AV_CODEC_ID_RAWAUDIO */

  1608.             if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {

  1609.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1610.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;

  1611.                 else if (descriptor->bits_per_sample == 32)

  1612.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;

  1613.             } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {

  1614.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1615.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;

  1616.                 else if (descriptor->bits_per_sample == 32)

  1617.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

  1618.             } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {

  1619.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1620.             }

  1621.         }

  1622.         if (descriptor->extradata) {

  1623.             st->codec->extradata = av_mallocz(descriptor->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

  1624.             if (st->codec->extradata) {

  1625.                 memcpy(st->codec->extradata, descriptor->extradata, descriptor->extradata_size);

  1626.                 st->codec->extradata_size = descriptor->extradata_size;

  1627.             }

  1628.         } else if (st->codec->codec_id == AV_CODEC_ID_H264) {

  1629.             ret = ff_generate_avci_extradata(st);

  1630.             if (ret < 0)

  1631.                 return ret;

  1632.         }

  1633.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1634.             /* TODO: decode timestamps */

  1635.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1636.         }

  1637.     }

  1638. 

  1639.     ret = 0;

  1640. fail_and_free:

  1641.     return ret;

  1642. }

  1643. 

  1644. static int mxf_read_utf16_string(AVIOContext *pb, int size, char** str)

  1645. {

  1646.     int ret;

  1647.     size_t buf_size;

  1648. 

  1649.     if (size < 0)

  1650.         return AVERROR(EINVAL);

  1651. 

  1652.     buf_size = size + size / 2 + 1;

  1653.     *str = av_malloc(buf_size);

  1654.     if (!*str)

  1655.         return AVERROR(ENOMEM);

  1656. 

  1657.     if ((ret = avio_get_str16be(pb, size, *str, buf_size)) < 0) {

  1658.         av_freep(str);

  1659.         return ret;

  1660.     }

  1661. 

  1662.     return ret;

  1663. }

  1664. 

  1665. static int mxf_uid_to_str(UID uid, char **str)

  1666. {

  1667.     int i;

  1668.     char *p;

  1669.     p = *str = av_mallocz(sizeof(UID) * 2 + 4 + 1);

  1670.     if (!p)

  1671.         return AVERROR(ENOMEM);

  1672.     for (i = 0; i < sizeof(UID); i++) {

  1673.         snprintf(p, 2 + 1, "%.2x", uid[i]);

  1674.         p += 2;

  1675.         if (i == 3 || i == 5 || i == 7 || i == 9) {

  1676.             snprintf(p, 1 + 1, "-");

  1677.             p++;

  1678.         }

  1679.     }

  1680.     return 0;

  1681. }

  1682. 

  1683. static int mxf_timestamp_to_str(uint64_t timestamp, char **str)

  1684. {

  1685.     struct tm time = { 0 };

  1686.     time.tm_year = (timestamp >> 48) - 1900;

  1687.     time.tm_mon  = (timestamp >> 40 & 0xFF) - 1;

  1688.     time.tm_mday = (timestamp >> 32 & 0xFF);

  1689.     time.tm_hour = (timestamp >> 24 & 0xFF);

  1690.     time.tm_min  = (timestamp >> 16 & 0xFF);

  1691.     time.tm_sec  = (timestamp >> 8  & 0xFF);

  1692. 

  1693.     /* msvcrt versions of strftime calls the invalid parameter handler

  1694.      * (aborting the process if one isn't set) if the parameters are out

  1695.      * of range. */

  1696.     time.tm_mon  = av_clip(time.tm_mon,  0, 11);

  1697.     time.tm_mday = av_clip(time.tm_mday, 1, 31);

  1698.     time.tm_hour = av_clip(time.tm_hour, 0, 23);

  1699.     time.tm_min  = av_clip(time.tm_min,  0, 59);

  1700.     time.tm_sec  = av_clip(time.tm_sec,  0, 59);

  1701. 

  1702.     *str = av_mallocz(32);

  1703.     if (!*str)

  1704.         return AVERROR(ENOMEM);

  1705.     strftime(*str, 32, "%Y-%m-%d %H:%M:%S", &time);

  1706. 

  1707.     return 0;

  1708. }

  1709. 

  1710. #define SET_STR_METADATA(pb, name, str) do { \

  1711.     if ((ret = mxf_read_utf16_string(pb, size, &str)) < 0) \

  1712.         return ret; \

  1713.     av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \

  1714. } while (0)

  1715. 

  1716. #define SET_UID_METADATA(pb, name, var, str) do { \

  1717.     avio_read(pb, var, 16); \

  1718.     if ((ret = mxf_uid_to_str(var, &str)) < 0) \

  1719.         return ret; \

  1720.     av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \

  1721. } while (0)

  1722. 

  1723. #define SET_TS_METADATA(pb, name, var, str) do { \

  1724.     var = avio_rb64(pb); \

  1725.     if ((ret = mxf_timestamp_to_str(var, &str)) < 0) \

  1726.         return ret; \

  1727.     av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \

  1728. } while (0)

  1729. 

  1730. static int mxf_read_identification_metadata(void *arg, AVIOContext *pb, int tag, int size, UID _uid, int64_t klv_offset)

  1731. {

  1732.     MXFContext *mxf = arg;

  1733.     AVFormatContext *s = mxf->fc;

  1734.     int ret;

  1735.     UID uid = { 0 };

  1736.     char *str = NULL;

  1737.     uint64_t ts;

  1738.     switch (tag) {

  1739.     case 0x3C01:

  1740.         SET_STR_METADATA(pb, "company_name", str);

  1741.         break;

  1742.     case 0x3C02:

  1743.         SET_STR_METADATA(pb, "product_name", str);

  1744.         break;

  1745.     case 0x3C04:

  1746.         SET_STR_METADATA(pb, "product_version", str);

  1747.         break;

  1748.     case 0x3C05:

  1749.         SET_UID_METADATA(pb, "product_uid", uid, str);

  1750.         break;

  1751.     case 0x3C06:

  1752.         SET_TS_METADATA(pb, "modification_date", ts, str);

  1753.         break;

  1754.     case 0x3C08:

  1755.         SET_STR_METADATA(pb, "application_platform", str);

  1756.         break;

  1757.     case 0x3C09:

  1758.         SET_UID_METADATA(pb, "generation_uid", uid, str);

  1759.         break;

  1760.     case 0x3C0A:

  1761.         SET_UID_METADATA(pb, "uid", uid, str);

  1762.         break;

  1763.     }

  1764.     return 0;

  1765. }

  1766. 

  1767. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1768.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1769. //    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2f,0x00 }, mxf_read_preface_pack },

  1770.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1771.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1772.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1773.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1774.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1775.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1776.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1777.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1778.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1779.     { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1780.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x30,0x00 }, mxf_read_identification_metadata },

  1781.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1782.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1783.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1784.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1785.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1786.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1787.     { { 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 */

  1788.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1789.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1790.     { { 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 */

  1791.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1792.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1793.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1794.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1795.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1796.     { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1797.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1798. };

  1799. 

  1800. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1801. {

  1802.     AVIOContext *pb = mxf->fc->pb;

  1803.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1804.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1805. 

  1806.     if (!ctx)

  1807.         return AVERROR(ENOMEM);

  1808.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1809.         int ret;

  1810.         int tag = avio_rb16(pb);

  1811.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1812.         uint64_t next = avio_tell(pb) + size;

  1813.         UID uid = {0};

  1814. 

  1815.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1816.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1817.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1818.             continue;

  1819.         }

  1820.         if (tag > 0x7FFF) { /* dynamic tag */

  1821.             int i;

  1822.             for (i = 0; i < mxf->local_tags_count; i++) {

  1823.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1824.                 if (local_tag == tag) {

  1825.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1826.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1827.                     PRINT_KEY(mxf->fc, "uid", uid);

  1828.                 }

  1829.             }

  1830.         }

  1831.         if (ctx_size && tag == 0x3C0A)

  1832.             avio_read(pb, ctx->uid, 16);

  1833.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1834.             return ret;

  1835. 

  1836.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1837.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1838.         if (avio_tell(pb) > klv_end) {

  1839.             if (ctx_size)

  1840.                 av_free(ctx);

  1841. 

  1842.             av_log(mxf->fc, AV_LOG_ERROR,

  1843.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1844.                    tag, klv->offset);

  1845.             return AVERROR_INVALIDDATA;

  1846.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1847.             avio_seek(pb, next, SEEK_SET);

  1848.     }

  1849.     if (ctx_size) ctx->type = type;

  1850.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1851. }

  1852. 

  1853. /**

  1854.  * Seeks to the previous partition, if possible

  1855.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1856.  */

  1857. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1858. {

  1859.     AVIOContext *pb = mxf->fc->pb;

  1860. 

  1861.     if (!mxf->current_partition ||

  1862.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1863.         return 0;   /* we've parsed all partitions */

  1864. 

  1865.     /* seek to previous partition */

  1866.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1867.     mxf->current_partition = NULL;

  1868. 

  1869.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1870. 

  1871.     return 1;

  1872. }

  1873. 

  1874. /**

  1875.  * Called when essence is encountered

  1876.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1877.  */

  1878. static int mxf_parse_handle_essence(MXFContext *mxf)

  1879. {

  1880.     AVIOContext *pb = mxf->fc->pb;

  1881.     int64_t ret;

  1882. 

  1883.     if (mxf->parsing_backward) {

  1884.         return mxf_seek_to_previous_partition(mxf);

  1885.     } else {

  1886.         uint64_t offset = mxf->footer_partition ? mxf->footer_partition

  1887.                                                 : mxf->last_partition;

  1888. 

  1889.         if (!offset) {

  1890.             av_dlog(mxf->fc, "no last partition\n");

  1891.             return 0;

  1892.         }

  1893. 

  1894.         av_dlog(mxf->fc, "seeking to last partition\n");

  1895. 

  1896.         /* remember where we were so we don't end up seeking further back than this */

  1897.         mxf->last_forward_tell = avio_tell(pb);

  1898. 

  1899.         if (!pb->seekable) {

  1900.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing last partition\n");

  1901.             return -1;

  1902.         }

  1903. 

  1904.         /* seek to last partition and parse backward */

  1905.         if ((ret = avio_seek(pb, mxf->run_in + offset, SEEK_SET)) < 0) {

  1906.             av_log(mxf->fc, AV_LOG_ERROR,

  1907.                    "failed to seek to last partition @ 0x%" PRIx64

  1908.                    " (%"PRId64") - partial file?\n",

  1909.                    mxf->run_in + offset, ret);

  1910.             return ret;

  1911.         }

  1912. 

  1913.         mxf->current_partition = NULL;

  1914.         mxf->parsing_backward = 1;

  1915.     }

  1916. 

  1917.     return 1;

  1918. }

  1919. 

  1920. /**

  1921.  * Called when the next partition or EOF is encountered

  1922.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1923.  */

  1924. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1925. {

  1926.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1927. }

  1928. 

  1929. /**

  1930.  * Figure out the proper offset and length of the essence container

  1931.  * in each partition

  1932.  */

  1933. static void mxf_compute_essence_containers(MXFContext *mxf)

  1934. {

  1935.     int x;

  1936. 

  1937.     /* everything is already correct */

  1938.     if (mxf->op == OPAtom)

  1939.         return;

  1940. 

  1941.     for (x = 0; x < mxf->partitions_count; x++) {

  1942.         MXFPartition *p = &mxf->partitions[x];

  1943. 

  1944.         if (!p->body_sid)

  1945.             continue;       /* BodySID == 0 -> no essence */

  1946. 

  1947.         if (x >= mxf->partitions_count - 1)

  1948.             break;          /* last partition - can't compute length (and we don't need to) */

  1949. 

  1950.         /* essence container spans to the next partition */

  1951.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1952. 

  1953.         if (p->essence_length < 0) {

  1954.             /* next ThisPartition < essence_offset */

  1955.             p->essence_length = 0;

  1956.             av_log(mxf->fc, AV_LOG_ERROR,

  1957.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1958.                    x+1, mxf->partitions[x+1].this_partition);

  1959.         }

  1960.     }

  1961. }

  1962. 

  1963. static int64_t round_to_kag(int64_t position, int kag_size)

  1964. {

  1965.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1966.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1967.     int64_t ret = (position / kag_size) * kag_size;

  1968.     return ret == position ? ret : ret + kag_size;

  1969. }

  1970. 

  1971. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1972.                                                     MXFContext *mxf,

  1973.                                                     KLVPacket *klv)

  1974. {

  1975.     MXFPartition *cur_part = mxf->current_partition;

  1976.     /* for OP1a we compute essence_offset

  1977.      * for OPAtom we point essence_offset after the KL

  1978.      *     (usually op1a_essence_offset + 20 or 25)

  1979.      * TODO: for OP1a we could eliminate this entire if statement, always

  1980.      *       stopping parsing at op1a_essence_offset

  1981.      *       for OPAtom we still need the actual essence_offset though

  1982.      *       (the KL's length can vary)

  1983.      */

  1984.     int64_t op1a_essence_offset =

  1985.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1986.                      cur_part->kag_size) +

  1987.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1988.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1989. 

  1990.     if (mxf->op == OPAtom) {

  1991.         /* point essence_offset to the actual data

  1992.          * OPAtom has all the essence in one big KLV

  1993.          */

  1994.         cur_part->essence_offset = avio_tell(s->pb);

  1995.         cur_part->essence_length = klv->length;

  1996.     } else {

  1997.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1998.          * (C0023S01.mxf)  */

  1999.         cur_part->essence_offset = op1a_essence_offset;

  2000.     }

  2001. }

  2002. 

  2003. static int is_pcm(enum AVCodecID codec_id)

  2004. {

  2005.     /* we only care about "normal" PCM codecs until we get samples */

  2006.     return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;

  2007. }

  2008. 

  2009. /**

  2010.  * Deal with the case where for some audio atoms EditUnitByteCount is

  2011.  * very small (2, 4..). In those cases we should read more than one

  2012.  * sample per call to mxf_read_packet().

  2013.  */

  2014. static void mxf_handle_small_eubc(AVFormatContext *s)

  2015. {

  2016.     MXFContext *mxf = s->priv_data;

  2017. 

  2018.     /* assuming non-OPAtom == frame wrapped

  2019.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  2020.     if (mxf->op != OPAtom)

  2021.         return;

  2022. 

  2023.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  2024.     if (s->nb_streams != 1                                     ||

  2025.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  2026.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  2027.         mxf->nb_index_tables != 1                              ||

  2028.         mxf->index_tables[0].nb_segments != 1                  ||

  2029.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  2030.         return;

  2031. 

  2032.     /* arbitrarily default to 48 kHz PAL audio frame size */

  2033.     /* TODO: We could compute this from the ratio between the audio

  2034.      *       and video edit rates for 48 kHz NTSC we could use the

  2035.      *       1802-1802-1802-1802-1801 pattern. */

  2036.     mxf->edit_units_per_packet = 1920;

  2037. }

  2038. 

  2039. static void mxf_read_random_index_pack(AVFormatContext *s)

  2040. {

  2041.     MXFContext *mxf = s->priv_data;

  2042.     uint32_t length;

  2043.     int64_t file_size;

  2044.     KLVPacket klv;

  2045. 

  2046.     if (!s->pb->seekable)

  2047.         return;

  2048. 

  2049.     file_size = avio_size(s->pb);

  2050.     avio_seek(s->pb, file_size - 4, SEEK_SET);

  2051.     length = avio_rb32(s->pb);

  2052.     if (length <= 32 || length >= FFMIN(file_size, INT_MAX))

  2053.         goto end;

  2054.     avio_seek(s->pb, file_size - length, SEEK_SET);

  2055.     if (klv_read_packet(&klv, s->pb) < 0 ||

  2056.         !IS_KLV_KEY(klv.key, mxf_random_index_pack_key) ||

  2057.         klv.length != length - 20)

  2058.         goto end;

  2059. 

  2060.     avio_skip(s->pb, klv.length - 12);

  2061.     mxf->last_partition = avio_rb64(s->pb);

  2062. 

  2063. end:

  2064.     avio_seek(s->pb, mxf->run_in, SEEK_SET);

  2065. }

  2066. 

  2067. static int mxf_read_header(AVFormatContext *s)

  2068. {

  2069.     MXFContext *mxf = s->priv_data;

  2070.     KLVPacket klv;

  2071.     int64_t essence_offset = 0;

  2072.     int ret;

  2073. 

  2074.     mxf->last_forward_tell = INT64_MAX;

  2075.     mxf->edit_units_per_packet = 1;

  2076. 

  2077.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  2078.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  2079.         return AVERROR_INVALIDDATA;

  2080.     }

  2081.     avio_seek(s->pb, -14, SEEK_CUR);

  2082.     mxf->fc = s;

  2083.     mxf->run_in = avio_tell(s->pb);

  2084. 

  2085.     mxf_read_random_index_pack(s);

  2086. 

  2087.     while (!s->pb->eof_reached) {

  2088. 

  2089.         const MXFMetadataReadTableEntry *metadata;

  2090. 

  2091.         if (klv_read_packet(&klv, s->pb) < 0) {

  2092.             /* EOF - seek to previous partition or stop */

  2093.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  2094.                 break;

  2095.             else

  2096.                 continue;

  2097.         }

  2098. 

  2099.         PRINT_KEY(s, "read header", klv.key);

  2100.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2101.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  2102.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2103.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  2104.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  2105. 

  2106.             if (!mxf->current_partition) {

  2107.                 av_log(mxf->fc, AV_LOG_ERROR,

  2108.                        "found essence prior to first PartitionPack\n");

  2109.                 return AVERROR_INVALIDDATA;

  2110.             }

  2111. 

  2112.             if (!mxf->current_partition->essence_offset) {

  2113.                 compute_partition_essence_offset(s, mxf, &klv);

  2114.             }

  2115. 

  2116.             if (!essence_offset)

  2117.                 essence_offset = klv.offset;

  2118. 

  2119.             /* seek to footer, previous partition or stop */

  2120.             if (mxf_parse_handle_essence(mxf) <= 0)

  2121.                 break;

  2122.             continue;

  2123.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  2124.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  2125.             /* next partition pack - keep going, seek to previous partition or stop */

  2126.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  2127.                 break;

  2128.             else if (mxf->parsing_backward)

  2129.                 continue;

  2130.             /* we're still parsing forward. proceed to parsing this partition pack */

  2131.         }

  2132. 

  2133.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  2134.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  2135.                 int res;

  2136.                 if (klv.key[5] == 0x53) {

  2137.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  2138.                 } else {

  2139.                     uint64_t next = avio_tell(s->pb) + klv.length;

  2140.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  2141. 

  2142.                     /* only seek forward, else this can loop for a long time */

  2143.                     if (avio_tell(s->pb) > next) {

  2144.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  2145.                                klv.offset);

  2146.                         return AVERROR_INVALIDDATA;

  2147.                     }

  2148. 

  2149.                     avio_seek(s->pb, next, SEEK_SET);

  2150.                 }

  2151.                 if (res < 0) {

  2152.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  2153.                     return res;

  2154.                 }

  2155.                 break;

  2156.             }

  2157.         }

  2158.         if (!metadata->read)

  2159.             avio_skip(s->pb, klv.length);

  2160.     }

  2161.     /* FIXME avoid seek */

  2162.     if (!essence_offset)  {

  2163.         av_log(s, AV_LOG_ERROR, "no essence\n");

  2164.         return AVERROR_INVALIDDATA;

  2165.     }

  2166.     avio_seek(s->pb, essence_offset, SEEK_SET);

  2167. 

  2168.     mxf_compute_essence_containers(mxf);

  2169. 

  2170.     /* we need to do this before computing the index tables

  2171.      * to be able to fill in zero IndexDurations with st->duration */

  2172.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  2173.         return ret;

  2174. 

  2175.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  2176.         return ret;

  2177. 

  2178.     if (mxf->nb_index_tables > 1) {

  2179.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  2180.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  2181.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  2182.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  2183.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  2184.         return AVERROR_INVALIDDATA;

  2185.     }

  2186. 

  2187.     mxf_handle_small_eubc(s);

  2188. 

  2189.     return 0;

  2190. }

  2191. 

  2192. /**

  2193.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  2194.  * @return next_ofs if OK, <0 on error

  2195.  */

  2196. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  2197. {

  2198.     int64_t last_ofs = -1, next_ofs = -1;

  2199.     MXFIndexTable *t = &mxf->index_tables[0];

  2200. 

  2201.     /* this is called from the OP1a demuxing logic, which means there

  2202.      * may be no index tables */

  2203.     if (mxf->nb_index_tables <= 0)

  2204.         return -1;

  2205. 

  2206.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  2207.      * of current_offset */

  2208.     while (mxf->current_edit_unit >= 0) {

  2209.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  2210.                                           NULL, &next_ofs, 0) < 0)

  2211.             return -1;

  2212. 

  2213.         if (next_ofs <= last_ofs) {

  2214.             /* large next_ofs didn't change or current_edit_unit wrapped

  2215.              * around this fixes the infinite loop on zzuf3.mxf */

  2216.             av_log(mxf->fc, AV_LOG_ERROR,

  2217.                    "next_ofs didn't change. not deriving packet timestamps\n");

  2218.             return -1;

  2219.         }

  2220. 

  2221.         if (next_ofs > current_offset)

  2222.             break;

  2223. 

  2224.         last_ofs = next_ofs;

  2225.         mxf->current_edit_unit++;

  2226.     }

  2227. 

  2228.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  2229.      * may lack IndexEntryArrays */

  2230.     if (mxf->current_edit_unit < 0)

  2231.         return -1;

  2232. 

  2233.     return next_ofs;

  2234. }

  2235. 

  2236. static int mxf_compute_sample_count(MXFContext *mxf, int stream_index,

  2237.                                     uint64_t *sample_count)

  2238. {

  2239.     int i, total = 0, size = 0;

  2240.     AVStream *st = mxf->fc->streams[stream_index];

  2241.     MXFTrack *track = st->priv_data;

  2242.     AVRational time_base = av_inv_q(track->edit_rate);

  2243.     AVRational sample_rate = av_inv_q(st->time_base);

  2244.     const MXFSamplesPerFrame *spf = NULL;

  2245. 

  2246.     if ((sample_rate.num / sample_rate.den) == 48000)

  2247.         spf = ff_mxf_get_samples_per_frame(mxf->fc, time_base);

  2248.     if (!spf) {

  2249.         int remainder = (sample_rate.num * time_base.num) %

  2250.                         (time_base.den * sample_rate.den);

  2251.         *sample_count = av_q2d(av_mul_q((AVRational){mxf->current_edit_unit, 1},

  2252.                                         av_mul_q(sample_rate, time_base)));

  2253.         if (remainder)

  2254.             av_log(mxf->fc, AV_LOG_WARNING,

  2255.                    "seeking detected on stream #%d with time base (%d/%d) and "

  2256.                    "sample rate (%d/%d), audio pts won't be accurate.\n",

  2257.                    stream_index, time_base.num, time_base.den,

  2258.                    sample_rate.num, sample_rate.den);

  2259.         return 0;

  2260.     }

  2261. 

  2262.     while (spf->samples_per_frame[size]) {

  2263.         total += spf->samples_per_frame[size];

  2264.         size++;

  2265.     }

  2266. 

  2267.     if (!size)

  2268.         return 0;

  2269. 

  2270.     *sample_count = (mxf->current_edit_unit / size) * (uint64_t)total;

  2271.     for (i = 0; i < mxf->current_edit_unit % size; i++) {

  2272.         *sample_count += spf->samples_per_frame[i];

  2273.     }

  2274. 

  2275.     return 0;

  2276. }

  2277. 

  2278. static int mxf_set_audio_pts(MXFContext *mxf, AVCodecContext *codec,

  2279.                              AVPacket *pkt)

  2280. {

  2281.     MXFTrack *track = mxf->fc->streams[pkt->stream_index]->priv_data;

  2282.     int64_t bits_per_sample = av_get_bits_per_sample(codec->codec_id);

  2283. 

  2284.     pkt->pts = track->sample_count;

  2285. 

  2286.     if (codec->channels <= 0 || codec->channels * bits_per_sample < 8)

  2287.         return AVERROR_INVALIDDATA;

  2288. 

  2289.     track->sample_count += pkt->size / (codec->channels * bits_per_sample / 8);

  2290.     return 0;

  2291. }

  2292. 

  2293. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  2294. {

  2295.     KLVPacket klv;

  2296.     MXFContext *mxf = s->priv_data;

  2297.     int ret;

  2298. 

  2299.     while (!s->pb->eof_reached) {

  2300.         if ((ret = klv_read_packet(&klv, s->pb)) < 0)

  2301.             return ret;

  2302.         PRINT_KEY(s, "read packet", klv.key);

  2303.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2304.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  2305.             ret = mxf_decrypt_triplet(s, pkt, &klv);

  2306.             if (ret < 0) {

  2307.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  2308.                 return ret;

  2309.             }

  2310.             return 0;

  2311.         }

  2312.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2313.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2314.             int index = mxf_get_stream_index(s, &klv);

  2315.             int64_t next_ofs, next_klv;

  2316.             AVStream *st;

  2317.             MXFTrack *track;

  2318.             AVCodecContext *codec;

  2319. 

  2320.             if (index < 0) {

  2321.                 av_log(s, AV_LOG_ERROR,

  2322.                        "error getting stream index %"PRIu32"\n",

  2323.                        AV_RB32(klv.key + 12));

  2324.                 goto skip;

  2325.             }

  2326. 

  2327.             st = s->streams[index];

  2328.             track = st->priv_data;

  2329. 

  2330.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2331.                 goto skip;

  2332. 

  2333.             next_klv = avio_tell(s->pb) + klv.length;

  2334.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2335. 

  2336.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2337.                 /* if this check is hit then it's possible OPAtom was treated

  2338.                  * as OP1a truncate the packet since it's probably very large

  2339.                  * (>2 GiB is common) */

  2340.                 avpriv_request_sample(s,

  2341.                                       "OPAtom misinterpreted as OP1a?"

  2342.                                       "KLV for edit unit %i extending into "

  2343.                                       "next edit unit",

  2344.                                       mxf->current_edit_unit);

  2345.                 klv.length = next_ofs - avio_tell(s->pb);

  2346.             }

  2347. 

  2348.             /* check for 8 channels AES3 element */

  2349.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2350.                 ret = mxf_get_d10_aes3_packet(s->pb, s->streams[index],

  2351.                                               pkt, klv.length);

  2352.                 if (ret < 0) {

  2353.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2354.                     return ret;

  2355.                 }

  2356.             } else {

  2357.                 ret = av_get_packet(s->pb, pkt, klv.length);

  2358.                 if (ret < 0)

  2359.                     return ret;

  2360.             }

  2361.             pkt->stream_index = index;

  2362.             pkt->pos = klv.offset;

  2363. 

  2364.             codec = s->streams[index]->codec;

  2365. 

  2366.             if (codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2367.                 /* mxf->current_edit_unit good - see if we have an

  2368.                  * index table to derive timestamps from */

  2369.                 MXFIndexTable *t = &mxf->index_tables[0];

  2370. 

  2371.                 if (mxf->nb_index_tables >= 1 &&

  2372.                     mxf->current_edit_unit < t->nb_ptses) {

  2373.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2374.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2375.                 } else if (track->intra_only) {

  2376.                     /* intra-only -> PTS = EditUnit.

  2377.                      * let utils.c figure out DTS since it can be

  2378.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2379.                     pkt->pts = mxf->current_edit_unit;

  2380.                 }

  2381.             } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  2382.                 ret = mxf_set_audio_pts(mxf, codec, pkt);

  2383.                 if (ret < 0)

  2384.                     return ret;

  2385.             }

  2386. 

  2387.             /* seek for truncated packets */

  2388.             avio_seek(s->pb, next_klv, SEEK_SET);

  2389. 

  2390.             return 0;

  2391.         } else

  2392.         skip:

  2393.             avio_skip(s->pb, klv.length);

  2394.     }

  2395.     return AVERROR_EOF;

  2396. }

  2397. 

  2398. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2399. {

  2400.     MXFContext *mxf = s->priv_data;

  2401.     int ret, size;

  2402.     int64_t ret64, pos, next_pos;

  2403.     AVStream *st;

  2404.     MXFIndexTable *t;

  2405.     int edit_units;

  2406. 

  2407.     if (mxf->op != OPAtom)

  2408.         return mxf_read_packet_old(s, pkt);

  2409. 

  2410.     /* OPAtom - clip wrapped demuxing */

  2411.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2412.     st = s->streams[0];

  2413.     t = &mxf->index_tables[0];

  2414. 

  2415.     if (mxf->current_edit_unit >= st->duration)

  2416.         return AVERROR_EOF;

  2417. 

  2418.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2419. 

  2420.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2421.         return ret;

  2422. 

  2423.     /* compute size by finding the next edit unit or the end of the essence container

  2424.      * not pretty, but it works */

  2425.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2426.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2427.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2428.         return AVERROR_INVALIDDATA;

  2429.     }

  2430. 

  2431.     if ((size = next_pos - pos) <= 0) {

  2432.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2433.         return AVERROR_INVALIDDATA;

  2434.     }

  2435. 

  2436.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2437.         return ret64;

  2438. 

  2439.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2440.             return ret < 0 ? ret : AVERROR_EOF;

  2441. 

  2442.     pkt->stream_index = 0;

  2443. 

  2444.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2445.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2446.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2447.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2448.     } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  2449.         int ret = mxf_set_audio_pts(mxf, st->codec, pkt);

  2450.         if (ret < 0)

  2451.             return ret;

  2452.     }

  2453. 

  2454.     mxf->current_edit_unit += edit_units;

  2455. 

  2456.     return 0;

  2457. }

  2458. 

  2459. 

  2460. static int mxf_read_close(AVFormatContext *s)

  2461. {

  2462.     MXFContext *mxf = s->priv_data;

  2463.     MXFIndexTableSegment *seg;

  2464.     int i;

  2465. 

  2466.     av_freep(&mxf->packages_refs);

  2467. 

  2468.     for (i = 0; i < s->nb_streams; i++)

  2469.         s->streams[i]->priv_data = NULL;

  2470. 

  2471.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2472.         switch (mxf->metadata_sets[i]->type) {

  2473.         case Descriptor:

  2474.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->extradata);

  2475.             break;

  2476.         case MultipleDescriptor:

  2477.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2478.             break;

  2479.         case Sequence:

  2480.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2481.             break;

  2482.         case SourcePackage:

  2483.         case MaterialPackage:

  2484.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2485.             break;

  2486.         case IndexTableSegment:

  2487.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2488.             av_freep(&seg->temporal_offset_entries);

  2489.             av_freep(&seg->flag_entries);

  2490.             av_freep(&seg->stream_offset_entries);

  2491.             break;

  2492.         default:

  2493.             break;

  2494.         }

  2495.         av_freep(&mxf->metadata_sets[i]);

  2496.     }

  2497.     av_freep(&mxf->partitions);

  2498.     av_freep(&mxf->metadata_sets);

  2499.     av_freep(&mxf->aesc);

  2500.     av_freep(&mxf->local_tags);

  2501. 

  2502.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2503.         av_freep(&mxf->index_tables[i].segments);

  2504.         av_freep(&mxf->index_tables[i].ptses);

  2505.         av_freep(&mxf->index_tables[i].fake_index);

  2506.     }

  2507.     av_freep(&mxf->index_tables);

  2508. 

  2509.     return 0;

  2510. }

  2511. 

  2512. static int mxf_probe(AVProbeData *p) {

  2513.     uint8_t *bufp = p->buf;

  2514.     uint8_t *end = p->buf + p->buf_size;

  2515. 

  2516.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2517.         return 0;

  2518. 

  2519.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2520.     end -= sizeof(mxf_header_partition_pack_key);

  2521.     for (; bufp < end; bufp++) {

  2522.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2523.             return AVPROBE_SCORE_MAX;

  2524.     }

  2525.     return 0;

  2526. }

  2527. 

  2528. /* rudimentary byte seek */

  2529. /* XXX: use MXF Index */

  2530. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2531. {

  2532.     AVStream *st = s->streams[stream_index];

  2533.     int64_t seconds;

  2534.     MXFContext* mxf = s->priv_data;

  2535.     int64_t seekpos;

  2536.     int i, ret;

  2537.     MXFIndexTable *t;

  2538.     MXFTrack *source_track = st->priv_data;

  2539. 

  2540.     /* if audio then truncate sample_time to EditRate */

  2541.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  2542.         sample_time = av_rescale_q(sample_time, st->time_base,

  2543.                                    av_inv_q(source_track->edit_rate));

  2544. 

  2545.     if (mxf->nb_index_tables <= 0) {

  2546.     if (!s->bit_rate)

  2547.         return AVERROR_INVALIDDATA;

  2548.     if (sample_time < 0)

  2549.         sample_time = 0;

  2550.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2551. 

  2552.     seekpos = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);

  2553.     if (seekpos < 0)

  2554.         return seekpos;

  2555. 

  2556.     ff_update_cur_dts(s, st, sample_time);

  2557.     mxf->current_edit_unit = sample_time;

  2558.     } else {

  2559.         t = &mxf->index_tables[0];

  2560. 

  2561.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2562.          * this also means we allow seeking before the start */

  2563.         sample_time = FFMAX(sample_time, 0);

  2564. 

  2565.         if (t->fake_index) {

  2566.             /* behave as if we have a proper index */

  2567.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2568.                 return sample_time;

  2569.         } else {

  2570.             /* no IndexEntryArray (one or more CBR segments)

  2571.              * make sure we don't seek past the end */

  2572.             sample_time = FFMIN(sample_time, source_track->original_duration - 1);

  2573.         }

  2574. 

  2575.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2576.             return ret;

  2577. 

  2578.         ff_update_cur_dts(s, st, sample_time);

  2579.         mxf->current_edit_unit = sample_time;

  2580.         avio_seek(s->pb, seekpos, SEEK_SET);

  2581.     }

  2582. 

  2583.     // Update all tracks sample count

  2584.     for (i = 0; i < s->nb_streams; i++) {

  2585.         AVStream *cur_st = s->streams[i];

  2586.         MXFTrack *cur_track = cur_st->priv_data;

  2587.         uint64_t current_sample_count = 0;

  2588.         if (cur_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  2589.             ret = mxf_compute_sample_count(mxf, i, &current_sample_count);

  2590.             if (ret < 0)

  2591.                 return ret;

  2592. 

  2593.             cur_track->sample_count = current_sample_count;

  2594.         }

  2595.     }

  2596.     return 0;

  2597. }

  2598. 

  2599. AVInputFormat ff_mxf_demuxer = {

  2600.     .name           = "mxf",

  2601.     .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

  2602.     .priv_data_size = sizeof(MXFContext),

  2603.     .read_probe     = mxf_probe,

  2604.     .read_header    = mxf_read_header,

  2605.     .read_packet    = mxf_read_packet,

  2606.     .read_close     = mxf_read_close,

  2607.     .read_seek      = mxf_read_seek,

  2608. };