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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "avformat.h"

  52. #include "internal.h"

  53. #include "mxf.h"

  54. 

  55. typedef enum {

  56.     Header,

  57.     BodyPartition,

  58.     Footer

  59. } MXFPartitionType;

  60. 

  61. typedef enum {

  62.     OP1a,

  63.     OP1b,

  64.     OP1c,

  65.     OP2a,

  66.     OP2b,

  67.     OP2c,

  68.     OP3a,

  69.     OP3b,

  70.     OP3c,

  71.     OPAtom,

  72. } MXFOP;

  73. 

  74. typedef struct {

  75.     int closed;

  76.     int complete;

  77.     MXFPartitionType type;

  78.     uint64_t previous_partition;

  79.     int index_sid;

  80.     int body_sid;

  81.     int64_t this_partition;

  82. } MXFPartition;

  83. 

  84. typedef struct {

  85.     UID uid;

  86.     enum MXFMetadataSetType type;

  87.     UID source_container_ul;

  88. } MXFCryptoContext;

  89. 

  90. typedef struct {

  91.     UID uid;

  92.     enum MXFMetadataSetType type;

  93.     UID source_package_uid;

  94.     UID data_definition_ul;

  95.     int64_t duration;

  96.     int64_t start_position;

  97.     int source_track_id;

  98. } MXFStructuralComponent;

  99. 

  100. typedef struct {

  101.     UID uid;

  102.     enum MXFMetadataSetType type;

  103.     UID data_definition_ul;

  104.     UID *structural_components_refs;

  105.     int structural_components_count;

  106.     int64_t duration;

  107. } MXFSequence;

  108. 

  109. typedef struct {

  110.     UID uid;

  111.     enum MXFMetadataSetType type;

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

  113.     UID sequence_ref;

  114.     int track_id;

  115.     uint8_t track_number[4];

  116.     AVRational edit_rate;

  117. } MXFTrack;

  118. 

  119. typedef struct {

  120.     UID uid;

  121.     enum MXFMetadataSetType type;

  122.     UID essence_container_ul;

  123.     UID essence_codec_ul;

  124.     AVRational sample_rate;

  125.     AVRational aspect_ratio;

  126.     int width;

  127.     int height;

  128.     int channels;

  129.     int bits_per_sample;

  130.     UID *sub_descriptors_refs;

  131.     int sub_descriptors_count;

  132.     int linked_track_id;

  133.     uint8_t *extradata;

  134.     int extradata_size;

  135.     enum PixelFormat pix_fmt;

  136. } MXFDescriptor;

  137. 

  138. typedef struct {

  139.     UID uid;

  140.     enum MXFMetadataSetType type;

  141.     int edit_unit_byte_count;

  142.     int index_sid;

  143.     int body_sid;

  144.     int slice_count;

  145.     AVRational index_edit_rate;

  146.     uint64_t index_start_position;

  147.     uint64_t index_duration;

  148.     int *slice;

  149.     int *element_delta;

  150.     int nb_delta_entries;

  151.     int *flag_entries;

  152.     uint64_t *stream_offset_entries;

  153.     uint32_t **slice_offset_entries;

  154.     int nb_index_entries;

  155. } MXFIndexTableSegment;

  156. 

  157. typedef struct {

  158.     UID uid;

  159.     enum MXFMetadataSetType type;

  160.     UID package_uid;

  161.     UID *tracks_refs;

  162.     int tracks_count;

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

  164.     UID descriptor_ref;

  165. } MXFPackage;

  166. 

  167. typedef struct {

  168.     UID uid;

  169.     enum MXFMetadataSetType type;

  170. } MXFMetadataSet;

  171. 

  172. typedef struct {

  173.     MXFPartition *partitions;

  174.     unsigned partitions_count;

  175.     MXFOP op;

  176.     UID *packages_refs;

  177.     int packages_count;

  178.     MXFMetadataSet **metadata_sets;

  179.     int metadata_sets_count;

  180.     AVFormatContext *fc;

  181.     struct AVAES *aesc;

  182.     uint8_t *local_tags;

  183.     int local_tags_count;

  184.     uint64_t footer_partition;

  185.     int system_item;

  186.     int64_t essence_offset;

  187.     int first_essence_kl_length;

  188.     int64_t first_essence_length;

  189.     KLVPacket current_klv_data;

  190.     int current_klv_index;

  191.     int run_in;

  192.     MXFPartition *current_partition;

  193.     int parsing_backward;

  194.     int64_t last_forward_tell;

  195.     int last_forward_partition;

  196. } MXFContext;

  197. 

  198. enum MXFWrappingScheme {

  199.     Frame,

  200.     Clip,

  201. };

  202. 

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

  204. 

  205. typedef struct {

  206.     const UID key;

  207.     MXFMetadataReadFunc *read;

  208.     int ctx_size;

  209.     enum MXFMetadataSetType type;

  210. } MXFMetadataReadTableEntry;

  211. 

  212. /* partial keys to match */

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

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

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

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

  217. /* complete keys to match */

  218. 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 };

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

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

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

  222. 

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

  224. 

  225. static int64_t klv_decode_ber_length(AVIOContext *pb)

  226. {

  227.     uint64_t size = avio_r8(pb);

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

  229.         int bytes_num = size & 0x7f;

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

  231.         if (bytes_num > 8)

  232.             return AVERROR_INVALIDDATA;

  233.         size = 0;

  234.         while (bytes_num--)

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

  236.     }

  237.     return size;

  238. }

  239. 

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

  241. {

  242.     int i, b;

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

  244.         b = avio_r8(pb);

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

  246.             i = 0;

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

  248.             i = -1;

  249.     }

  250.     return i == size;

  251. }

  252. 

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

  254. {

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

  256.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  262. }

  263. 

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

  265. {

  266.     int i;

  267. 

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

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

  270.         /* SMPTE 379M 7.3 */

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

  272.             return i;

  273.     }

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

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

  276. }

  277. 

  278. /* XXX: use AVBitStreamFilter */

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

  280. {

  281.     const uint8_t *buf_ptr, *end_ptr;

  282.     uint8_t *data_ptr;

  283.     int i;

  284. 

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

  286.         return AVERROR_INVALIDDATA;

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

  288.     if (length < 0)

  289.         return length;

  290.     data_ptr = pkt->data;

  291.     end_ptr = pkt->data + length;

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

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

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

  295.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  298.             else

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

  300.         }

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

  302.     }

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

  304.     return 0;

  305. }

  306. 

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

  308. {

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

  310.     MXFContext *mxf = s->priv_data;

  311.     AVIOContext *pb = s->pb;

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

  313.     int64_t size;

  314.     uint64_t orig_size;

  315.     uint64_t plaintext_size;

  316.     uint8_t ivec[16];

  317.     uint8_t tmpbuf[16];

  318.     int index;

  319. 

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

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

  322.         if (!mxf->aesc)

  323.             return AVERROR(ENOMEM);

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

  325.     }

  326.     // crypto context

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

  328.     // plaintext offset

  329.     klv_decode_ber_length(pb);

  330.     plaintext_size = avio_rb64(pb);

  331.     // source klv key

  332.     klv_decode_ber_length(pb);

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

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

  335.         return AVERROR_INVALIDDATA;

  336.     index = mxf_get_stream_index(s, klv);

  337.     if (index < 0)

  338.         return AVERROR_INVALIDDATA;

  339.     // source size

  340.     klv_decode_ber_length(pb);

  341.     orig_size = avio_rb64(pb);

  342.     if (orig_size < plaintext_size)

  343.         return AVERROR_INVALIDDATA;

  344.     // enc. code

  345.     size = klv_decode_ber_length(pb);

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

  347.         return AVERROR_INVALIDDATA;

  348.     avio_read(pb, ivec, 16);

  349.     avio_read(pb, tmpbuf, 16);

  350.     if (mxf->aesc)

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

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

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

  354.     size -= 32;

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

  356.     if (size < 0)

  357.         return size;

  358.     else if (size < plaintext_size)

  359.         return AVERROR_INVALIDDATA;

  360.     size -= plaintext_size;

  361.     if (mxf->aesc)

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

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

  364.     av_shrink_packet(pkt, orig_size);

  365.     pkt->stream_index = index;

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

  367.     return 0;

  368. }

  369. 

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

  371. {

  372.     KLVPacket klv;

  373. 

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

  375.         int ret;

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

  377.             return -1;

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

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

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

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

  382.             if (ret < 0) {

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

  384.                 return AVERROR_INVALIDDATA;

  385.             }

  386.             return 0;

  387.         }

  388.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

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

  390.             if (index < 0) {

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

  392.                 goto skip;

  393.             }

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

  395.                 goto skip;

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

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

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

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

  400.                     return AVERROR_INVALIDDATA;

  401.                 }

  402.             } else {

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

  404.                 if (ret < 0)

  405.                     return ret;

  406.             }

  407.             pkt->stream_index = index;

  408.             pkt->pos = klv.offset;

  409.             return 0;

  410.         } else

  411.         skip:

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

  413.     }

  414.     return AVERROR_EOF;

  415. }

  416. 

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

  418. {

  419.     MXFContext *mxf = arg;

  420.     int item_num = avio_rb32(pb);

  421.     int item_len = avio_rb32(pb);

  422. 

  423.     if (item_len != 18) {

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

  425.                               item_len);

  426.         return AVERROR_PATCHWELCOME;

  427.     }

  428.     if (item_num > UINT_MAX / item_len)

  429.         return AVERROR_INVALIDDATA;

  430.     mxf->local_tags_count = item_num;

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

  432.     if (!mxf->local_tags)

  433.         return AVERROR(ENOMEM);

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

  435.     return 0;

  436. }

  437. 

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

  439. {

  440.     MXFContext *mxf = arg;

  441.     MXFPartition *partition;

  442.     UID op;

  443.     uint64_t footer_partition;

  444. 

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

  446.         return AVERROR(ENOMEM);

  447. 

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

  449.     if (!mxf->partitions)

  450.         return AVERROR(ENOMEM);

  451. 

  452.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  459.     } else {

  460.         mxf->last_forward_partition++;

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

  462.     }

  463. 

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

  465.     mxf->partitions_count++;

  466. 

  467.     switch(uid[13]) {

  468.     case 2:

  469.         partition->type = Header;

  470.         break;

  471.     case 3:

  472.         partition->type = BodyPartition;

  473.         break;

  474.     case 4:

  475.         partition->type = Footer;

  476.         break;

  477.     default:

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

  479.         return AVERROR_INVALIDDATA;

  480.     }

  481. 

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

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

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

  485.     avio_skip(pb, 8);

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

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

  488.     footer_partition = avio_rb64(pb);

  489.     avio_skip(pb, 16);

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

  491.     avio_skip(pb, 8);

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

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

  494. 

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

  496.     if (footer_partition) {

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

  498.             av_log(mxf->fc, AV_LOG_ERROR, "inconsistent FooterPartition value: %li != %li\n",

  499.                    mxf->footer_partition, footer_partition);

  500.         } else {

  501.             mxf->footer_partition = footer_partition;

  502.         }

  503.     }

  504. 

  505.     av_dlog(mxf->fc, "PartitionPack: ThisPartition = 0x%lx, PreviousPartition = 0x%lx, "

  506.             "FooterPartition = 0x%lx, IndexSID = %i, BodySID = %i\n",

  507.             partition->this_partition,

  508.             partition->previous_partition, footer_partition,

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

  510. 

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

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

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

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

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

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

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

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

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

  520.     else if (op[12] == 0x10)             mxf->op = OPAtom;

  521.     else

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

  523. 

  524.     return 0;

  525. }

  526. 

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

  528. {

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

  530.         return AVERROR(ENOMEM);

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

  532.     if (!mxf->metadata_sets)

  533.         return AVERROR(ENOMEM);

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

  535.     mxf->metadata_sets_count++;

  536.     return 0;

  537. }

  538. 

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

  540. {

  541.     MXFCryptoContext *cryptocontext = arg;

  542.     if (size != 16)

  543.         return AVERROR_INVALIDDATA;

  544.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  546.     return 0;

  547. }

  548. 

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

  550. {

  551.     MXFContext *mxf = arg;

  552.     switch (tag) {

  553.     case 0x1901:

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

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

  556.             return AVERROR_INVALIDDATA;

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

  558.         if (!mxf->packages_refs)

  559.             return AVERROR(ENOMEM);

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

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

  562.         break;

  563.     }

  564.     return 0;

  565. }

  566. 

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

  568. {

  569.     MXFStructuralComponent *source_clip = arg;

  570.     switch(tag) {

  571.     case 0x0202:

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

  573.         break;

  574.     case 0x1201:

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

  576.         break;

  577.     case 0x1101:

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

  579.         avio_skip(pb, 16);

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

  581.         break;

  582.     case 0x1102:

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

  584.         break;

  585.     }

  586.     return 0;

  587. }

  588. 

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

  590. {

  591.     MXFPackage *package = arg;

  592.     switch(tag) {

  593.     case 0x4403:

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

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

  596.             return AVERROR_INVALIDDATA;

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

  598.         if (!package->tracks_refs)

  599.             return AVERROR(ENOMEM);

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

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

  602.         break;

  603.     }

  604.     return 0;

  605. }

  606. 

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

  608. {

  609.     MXFTrack *track = arg;

  610.     switch(tag) {

  611.     case 0x4801:

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

  613.         break;

  614.     case 0x4804:

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

  616.         break;

  617.     case 0x4B01:

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

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

  620.         break;

  621.     case 0x4803:

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

  623.         break;

  624.     }

  625.     return 0;

  626. }

  627. 

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

  629. {

  630.     MXFSequence *sequence = arg;

  631.     switch(tag) {

  632.     case 0x0202:

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

  634.         break;

  635.     case 0x0201:

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

  637.         break;

  638.     case 0x1001:

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

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

  641.             return AVERROR_INVALIDDATA;

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

  643.         if (!sequence->structural_components_refs)

  644.             return AVERROR(ENOMEM);

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

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

  647.         break;

  648.     }

  649.     return 0;

  650. }

  651. 

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

  653. {

  654.     MXFPackage *package = arg;

  655.     switch(tag) {

  656.     case 0x4403:

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

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

  659.             return AVERROR_INVALIDDATA;

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

  661.         if (!package->tracks_refs)

  662.             return AVERROR(ENOMEM);

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

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

  665.         break;

  666.     case 0x4401:

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

  668.         avio_skip(pb, 16);

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

  670.         break;

  671.     case 0x4701:

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

  673.         break;

  674.     }

  675.     return 0;

  676. }

  677. 

  678. static int mxf_read_delta_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)

  679. {

  680.     int i, length;

  681. 

  682.     segment->nb_delta_entries = avio_rb32(pb);

  683.     if (segment->nb_delta_entries < 1 ||

  684.         segment->nb_delta_entries > INT_MAX >> av_log2(sizeof(*segment->slice)))

  685.         return AVERROR(ENOMEM);

  686. 

  687.     length = avio_rb32(pb);

  688. 

  689.     segment->slice = av_mallocz(segment->nb_delta_entries *

  690.                                 sizeof(*segment->slice));

  691.     if (!segment->slice)

  692.         return AVERROR(ENOMEM);

  693.     segment->element_delta = av_mallocz(segment->nb_delta_entries *

  694.                                         sizeof(*segment->element_delta));

  695.     if (!segment->element_delta) {

  696.         av_freep(&segment->slice);

  697.         return AVERROR(ENOMEM);

  698.     }

  699. 

  700.     for (i = 0; i < segment->nb_delta_entries; i++) {

  701.         avio_r8(pb);    /* PosTableIndex */

  702.         segment->slice[i] = avio_r8(pb);

  703.         segment->element_delta[i] = avio_rb32(pb);

  704.     }

  705.     return 0;

  706. }

  707. 

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

  709. {

  710.     int i, j, length;

  711. 

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

  713.     if (!segment->nb_index_entries)

  714.         return 0;

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

  716.              segment->nb_index_entries >

  717.              (INT_MAX >> av_log2(sizeof(*segment->stream_offset_entries))))

  718.         return AVERROR(ENOMEM);

  719. 

  720.     length = avio_rb32(pb);

  721. 

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

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

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

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

  726.     segment->slice_offset_entries  = av_mallocz(segment->nb_index_entries *

  727.                                        sizeof(*segment->slice_offset_entries));

  728. 

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

  730.         !segment->slice_offset_entries)

  731.         goto errmem;

  732. 

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

  734.         avio_rb16(pb);  /* TemporalOffset and KeyFrameOffset */

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

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

  737.         if (segment->slice_count) {

  738.             segment->slice_offset_entries[i] = av_mallocz(segment->slice_count *

  739.                                       sizeof(**segment->slice_offset_entries));

  740.             if (!segment->slice_offset_entries[i])

  741.                 goto errmem;

  742. 

  743.             for (j = 0; j < segment->slice_count; j++)

  744.                 segment->slice_offset_entries[i][j] = avio_rb32(pb);

  745.         }

  746. 

  747.         avio_skip(pb, length - 11 - 4 * segment->slice_count);

  748.     }

  749.     return 0;

  750. errmem:

  751.     if (segment->slice_offset_entries && segment->slice_count) {

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

  753.             av_free(segment->slice_offset_entries[i]);

  754.     }

  755.     av_freep(&segment->flag_entries);

  756.     av_freep(&segment->stream_offset_entries);

  757.     av_freep(&segment->slice_offset_entries);

  758.     return AVERROR(ENOMEM);

  759. }

  760. 

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

  762. {

  763.     MXFIndexTableSegment *segment = arg;

  764.     switch(tag) {

  765.     case 0x3F05:

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

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

  768.         break;

  769.     case 0x3F06:

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

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

  772.         break;

  773.     case 0x3F07:

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

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

  776.         break;

  777.     case 0x3F08:

  778.         segment->slice_count = avio_r8(pb);

  779.         av_dlog(NULL, "SliceCount %d\n", segment->slice_count);

  780.         break;

  781.     case 0x3F09:

  782.         av_dlog(NULL, "DeltaEntryArray found\n");

  783.         return mxf_read_delta_entry_array(pb, segment);

  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)

  825. {

  826.     MXFDescriptor *descriptor = arg;

  827.     switch(tag) {

  828.     case 0x3F01:

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

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

  831.             return AVERROR_INVALIDDATA;

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

  833.         if (!descriptor->sub_descriptors_refs)

  834.             return AVERROR(ENOMEM);

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

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

  837.         break;

  838.     case 0x3004:

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

  840.         break;

  841.     case 0x3006:

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

  843.         break;

  844.     case 0x3201: /* PictureEssenceCoding */

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

  846.         break;

  847.     case 0x3203:

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

  849.         break;

  850.     case 0x3202:

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

  852.         break;

  853.     case 0x320E:

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

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

  856.         break;

  857.     case 0x3D03:

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

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

  860.         break;

  861.     case 0x3D06: /* SoundEssenceCompression */

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

  863.         break;

  864.     case 0x3D07:

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

  866.         break;

  867.     case 0x3D01:

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

  869.         break;

  870.     case 0x3401:

  871.         mxf_read_pixel_layout(pb, descriptor);

  872.         break;

  873.     default:

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

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

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

  877.             if (!descriptor->extradata)

  878.                 return AVERROR(ENOMEM);

  879.             descriptor->extradata_size = size;

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

  881.         }

  882.         break;

  883.     }

  884.     return 0;

  885. }

  886. 

  887. /*

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

  889.  * Returns: boolean

  890.  */

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

  892. {

  893.     int i;

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

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

  896.             return 0;

  897.     }

  898.     return 1;

  899. }

  900. 

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

  902. {

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

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

  905.             break;

  906.         uls++;

  907.     }

  908.     return uls;

  909. }

  910. 

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

  912. {

  913.     int i;

  914. 

  915.     if (!strong_ref)

  916.         return NULL;

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

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

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

  920.             return mxf->metadata_sets[i];

  921.         }

  922.     }

  923.     return NULL;

  924. }

  925. 

  926. static const MXFCodecUL mxf_essence_container_uls[] = {

  927.     // video essence container uls

  928.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  929.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  930.     // sound essence container uls

  931.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  932.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  933.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  934.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  935.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  936. };

  937. 

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

  939. {

  940.     int i, j, nb_segments = 0;

  941.     MXFIndexTableSegment **unsorted_segments;

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

  943. 

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

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

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

  947.             nb_segments++;

  948. 

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

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

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

  952.         av_freep(sorted_segments);

  953.         av_free(unsorted_segments);

  954.         return AVERROR(ENOMEM);

  955.     }

  956. 

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

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

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

  960. 

  961.     *nb_sorted_segments = 0;

  962. 

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

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

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

  966. 

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

  968.             MXFIndexTableSegment *s = unsorted_segments[j];

  969. 

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

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

  972.              */

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

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

  975.                 best             = j;

  976.                 best_body_sid    = s->body_sid;

  977.                 best_index_sid   = s->index_sid;

  978.                 best_index_start = s->index_start_position;

  979.             }

  980.         }

  981. 

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

  983.         if (best == -1)

  984.             break;

  985. 

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

  987.         last_body_sid    = best_body_sid;

  988.         last_index_sid   = best_index_sid;

  989.         last_index_start = best_index_start;

  990.     }

  991. 

  992.     av_free(unsorted_segments);

  993. 

  994.     return 0;

  995. }

  996. 

  997. static int mxf_parse_index(MXFContext *mxf, int i, AVStream *st)

  998. {

  999.     int64_t accumulated_offset = 0;

  1000.     int j, k, ret, nb_sorted_segments;

  1001.     MXFIndexTableSegment **sorted_segments;

  1002. 

  1003.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)))

  1004.         return ret;

  1005. 

  1006.     for (j = 0; j < nb_sorted_segments; j++) {

  1007.         int n_delta = i;

  1008.         int duration, sample_duration = 1, last_sample_size = 0;

  1009.         int64_t segment_size;

  1010.         MXFIndexTableSegment *tableseg = sorted_segments[j];

  1011. 

  1012.         /* reset accumulated_offset on BodySID change */

  1013.         if (j > 0 && tableseg->body_sid != sorted_segments[j-1]->body_sid)

  1014.             accumulated_offset = 0;

  1015. 

  1016.         /* HACK: How to correctly link between streams and slices? */

  1017.         if (i < mxf->system_item + st->index)

  1018.             n_delta++;

  1019.         if (n_delta >= tableseg->nb_delta_entries && st->index != 0)

  1020.             continue;

  1021.         duration = tableseg->index_duration > 0 ? tableseg->index_duration :

  1022.             st->duration - st->nb_index_entries;

  1023.         segment_size = tableseg->edit_unit_byte_count * duration;

  1024.         /* check small EditUnitByteCount for audio */

  1025.         if (tableseg->edit_unit_byte_count && tableseg->edit_unit_byte_count < 32

  1026.             && !tableseg->index_duration) {

  1027.             /* duration might be prime relative to the new sample_duration,

  1028.              * which means we need to handle the last frame differently */

  1029.             sample_duration = 8192;

  1030.             last_sample_size = (duration % sample_duration) * tableseg->edit_unit_byte_count;

  1031.             tableseg->edit_unit_byte_count *= sample_duration;

  1032.             duration /= sample_duration;

  1033.             if (last_sample_size) duration++;

  1034.         }

  1035. 

  1036.         for (k = 0; k < duration; k++) {

  1037.             int64_t pos;

  1038.             int size, flags = 0;

  1039. 

  1040.             if (k < tableseg->nb_index_entries) {

  1041.                 pos = tableseg->stream_offset_entries[k];

  1042.                 if (n_delta < tableseg->nb_delta_entries) {

  1043.                     if (n_delta < tableseg->nb_delta_entries - 1) {

  1044.                         size =

  1045.                             tableseg->slice_offset_entries[k][tableseg->slice[n_delta+1]-1] +

  1046.                             tableseg->element_delta[n_delta+1] -

  1047.                             tableseg->element_delta[n_delta];

  1048.                         if (tableseg->slice[n_delta] > 0)

  1049.                             size -= tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1050.                     } else if (k < duration - 1) {

  1051.                         size = tableseg->stream_offset_entries[k+1] -

  1052.                             tableseg->stream_offset_entries[k] -

  1053.                             tableseg->slice_offset_entries[k][tableseg->slice[tableseg->nb_delta_entries-1]-1] -

  1054.                             tableseg->element_delta[tableseg->nb_delta_entries-1];

  1055.                     } else

  1056.                         size = 0;

  1057.                     if (tableseg->slice[n_delta] > 0)

  1058.                         pos += tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1059.                     pos += tableseg->element_delta[n_delta];

  1060.                 } else

  1061.                     size = 0;

  1062.                 flags = !(tableseg->flag_entries[k] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1063.             } else {

  1064.                 pos = (int64_t)k * tableseg->edit_unit_byte_count + accumulated_offset;

  1065.                 if (n_delta < tableseg->nb_delta_entries - 1)

  1066.                     size = tableseg->element_delta[n_delta+1] - tableseg->element_delta[n_delta];

  1067.                 else {

  1068.                     /* use smaller size for last sample if we should */

  1069.                     if (last_sample_size && k == duration - 1)

  1070.                         size = last_sample_size;

  1071.                     else

  1072.                         size = tableseg->edit_unit_byte_count;

  1073.                     if (tableseg->nb_delta_entries)

  1074.                         size -= tableseg->element_delta[tableseg->nb_delta_entries-1];

  1075.                 }

  1076.                 if (n_delta < tableseg->nb_delta_entries)

  1077.                     pos += tableseg->element_delta[n_delta];

  1078.                 flags = AVINDEX_KEYFRAME;

  1079.             }

  1080. 

  1081.             if (k > 0 && pos < mxf->first_essence_length && accumulated_offset == 0)

  1082.                 pos += mxf->first_essence_kl_length;

  1083. 

  1084.             pos += mxf->essence_offset;

  1085. 

  1086.             av_dlog(mxf->fc, "Stream %d IndexEntry %d n_Delta %d Offset %"PRIx64" Timestamp %"PRId64"\n",

  1087.                     st->index, st->nb_index_entries, n_delta, pos, sample_duration * st->nb_index_entries);

  1088. 

  1089.             if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)

  1090.                 return ret;

  1091.         }

  1092.         accumulated_offset += segment_size;

  1093.     }

  1094. 

  1095.     av_free(sorted_segments);

  1096. 

  1097.     return 0;

  1098. }

  1099. 

  1100. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1101. {

  1102.     MXFPackage *material_package = NULL;

  1103.     MXFPackage *temp_package = NULL;

  1104.     int i, j, k, ret;

  1105. 

  1106.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1107.     /* TODO: handle multiple material packages (OP3x) */

  1108.     for (i = 0; i < mxf->packages_count; i++) {

  1109.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1110.         if (material_package) break;

  1111.     }

  1112.     if (!material_package) {

  1113.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1114.         return AVERROR_INVALIDDATA;

  1115.     }

  1116. 

  1117.     for (i = 0; i < material_package->tracks_count; i++) {

  1118.         MXFPackage *source_package = NULL;

  1119.         MXFTrack *material_track = NULL;

  1120.         MXFTrack *source_track = NULL;

  1121.         MXFTrack *temp_track = NULL;

  1122.         MXFDescriptor *descriptor = NULL;

  1123.         MXFStructuralComponent *component = NULL;

  1124.         UID *essence_container_ul = NULL;

  1125.         const MXFCodecUL *codec_ul = NULL;

  1126.         const MXFCodecUL *container_ul = NULL;

  1127.         AVStream *st;

  1128. 

  1129.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1130.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1131.             continue;

  1132.         }

  1133. 

  1134.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1135.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1136.             continue;

  1137.         }

  1138. 

  1139.         /* TODO: handle multiple source clips */

  1140.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1141.             /* TODO: handle timecode component */

  1142.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1143.             if (!component)

  1144.                 continue;

  1145. 

  1146.             for (k = 0; k < mxf->packages_count; k++) {

  1147.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1148.                 if (!temp_package)

  1149.                     continue;

  1150.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1151.                     source_package = temp_package;

  1152.                     break;

  1153.                 }

  1154.             }

  1155.             if (!source_package) {

  1156.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);

  1157.                 break;

  1158.             }

  1159.             for (k = 0; k < source_package->tracks_count; k++) {

  1160.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1161.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1162.                     return AVERROR_INVALIDDATA;

  1163.                 }

  1164.                 if (temp_track->track_id == component->source_track_id) {

  1165.                     source_track = temp_track;

  1166.                     break;

  1167.                 }

  1168.             }

  1169.             if (!source_track) {

  1170.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1171.                 break;

  1172.             }

  1173.         }

  1174.         if (!source_track)

  1175.             continue;

  1176. 

  1177.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1178.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1179.             return AVERROR_INVALIDDATA;

  1180.         }

  1181. 

  1182.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1183.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1184.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1185.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1186.             continue;

  1187.         }

  1188. 

  1189.         st = avformat_new_stream(mxf->fc, NULL);

  1190.         if (!st) {

  1191.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1192.             return AVERROR(ENOMEM);

  1193.         }

  1194.         st->id = source_track->track_id;

  1195.         st->priv_data = source_track;

  1196.         st->duration = component->duration;

  1197.         if (st->duration == -1)

  1198.             st->duration = AV_NOPTS_VALUE;

  1199.         st->start_time = component->start_position;

  1200.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1201. 

  1202.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1203.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1204.         st->codec->codec_type = codec_ul->id;

  1205. 

  1206.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1207.         if (source_package->descriptor) {

  1208.             if (source_package->descriptor->type == MultipleDescriptor) {

  1209.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1210.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1211. 

  1212.                     if (!sub_descriptor) {

  1213.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1214.                         continue;

  1215.                     }

  1216.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1217.                         descriptor = sub_descriptor;

  1218.                         break;

  1219.                     }

  1220.                 }

  1221.             } else if (source_package->descriptor->type == Descriptor)

  1222.                 descriptor = source_package->descriptor;

  1223.         }

  1224.         if (!descriptor) {

  1225.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1226.             continue;

  1227.         }

  1228.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1229.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1230.         essence_container_ul = &descriptor->essence_container_ul;

  1231.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1232.          * is not allowed according to s429-6, try to find correct information anyway */

  1233.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1234.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1235.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1236.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1237.                 if (metadata->type == CryptoContext) {

  1238.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1239.                     break;

  1240.                 }

  1241.             }

  1242.         }

  1243.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1244.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1245.         st->codec->codec_id = codec_ul->id;

  1246.         if (descriptor->extradata) {

  1247.             st->codec->extradata = descriptor->extradata;

  1248.             st->codec->extradata_size = descriptor->extradata_size;

  1249.         }

  1250.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1251.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  1252.             if (st->codec->codec_id == CODEC_ID_NONE)

  1253.                 st->codec->codec_id = container_ul->id;

  1254.             st->codec->width = descriptor->width;

  1255.             st->codec->height = descriptor->height;

  1256.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1257.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1258.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1259.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1260.             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);

  1261.             if (st->codec->codec_id == CODEC_ID_NONE)

  1262.                 st->codec->codec_id = container_ul->id;

  1263.             st->codec->channels = descriptor->channels;

  1264.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1265.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1266.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1267.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1268.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1269.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1270.                 else if (descriptor->bits_per_sample == 32)

  1271.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1272.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1273.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1274.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1275.                 else if (descriptor->bits_per_sample == 32)

  1276.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1277.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1278.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1279.             }

  1280.         }

  1281.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1282.             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");

  1283.             st->need_parsing = AVSTREAM_PARSE_FULL;

  1284.         }

  1285. 

  1286.         if ((ret = mxf_parse_index(mxf, i, st)))

  1287.             return ret;

  1288.     }

  1289.     return 0;

  1290. }

  1291. 

  1292. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1293.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1294.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1295.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1296.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1297.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1298.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1299.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1300.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1301.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1302.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1303.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1304.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1305.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1306.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1307.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1308.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1309.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1310.     { { 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 */

  1311.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1312.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1313.     { { 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 */

  1314.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1315.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1316.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1317.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1318.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1319.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1320.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1321. };

  1322. 

  1323. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1324. {

  1325.     AVIOContext *pb = mxf->fc->pb;

  1326.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1327.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1328. 

  1329.     if (!ctx)

  1330.         return AVERROR(ENOMEM);

  1331.     while (avio_tell(pb) + 4 < klv_end) {

  1332.         int ret;

  1333.         int tag = avio_rb16(pb);

  1334.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1335.         uint64_t next = avio_tell(pb) + size;

  1336.         UID uid = {0};

  1337. 

  1338.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1339.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1340.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1341.             continue;

  1342.         }

  1343.         if (tag > 0x7FFF) { /* dynamic tag */

  1344.             int i;

  1345.             for (i = 0; i < mxf->local_tags_count; i++) {

  1346.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1347.                 if (local_tag == tag) {

  1348.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1349.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1350.                     PRINT_KEY(mxf->fc, "uid", uid);

  1351.                 }

  1352.             }

  1353.         }

  1354.         if (ctx_size && tag == 0x3C0A)

  1355.             avio_read(pb, ctx->uid, 16);

  1356.         else if ((ret = read_child(ctx, pb, tag, size, uid)) < 0)

  1357.             return ret;

  1358. 

  1359.         avio_seek(pb, next, SEEK_SET);

  1360.     }

  1361.     if (ctx_size) ctx->type = type;

  1362.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1363. }

  1364. 

  1365. /**

  1366.  * Seeks to the previous partition, if possible

  1367.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1368.  */

  1369. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1370. {

  1371.     AVIOContext *pb = mxf->fc->pb;

  1372. 

  1373.     if (!mxf->current_partition ||

  1374.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1375.         return 0;   /* we've parsed all partitions */

  1376. 

  1377.     /* seek to previous partition */

  1378.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1379.     mxf->current_partition = NULL;

  1380. 

  1381.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1382. 

  1383.     return 1;

  1384. }

  1385. 

  1386. /**

  1387.  * Called when essence is encountered

  1388.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1389.  */

  1390. static int mxf_parse_handle_essence(MXFContext *mxf)

  1391. {

  1392.     AVIOContext *pb = mxf->fc->pb;

  1393.     int64_t ret;

  1394. 

  1395.     if (!mxf->current_partition) {

  1396.         av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to PartitionPack\n");

  1397.         return AVERROR_INVALIDDATA;

  1398.     }

  1399. 

  1400.     if (mxf->parsing_backward) {

  1401.         return mxf_seek_to_previous_partition(mxf);

  1402.     } else {

  1403.         if (!mxf->footer_partition) {

  1404.             av_dlog(mxf->fc, "no footer\n");

  1405.             return 0;

  1406.         }

  1407. 

  1408.         av_dlog(mxf->fc, "seeking to footer\n");

  1409. 

  1410.         /* remember where we were so we don't end up seeking further back than this */

  1411.         mxf->last_forward_tell = avio_tell(pb);

  1412. 

  1413.         if (!pb->seekable) {

  1414.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1415.             return -1;

  1416.         }

  1417. 

  1418.         /* seek to footer partition and parse backward */

  1419.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1420.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1421.                    mxf->run_in + mxf->footer_partition, ret);

  1422.             return ret;

  1423.         }

  1424. 

  1425.         mxf->current_partition = NULL;

  1426.         mxf->parsing_backward = 1;

  1427.     }

  1428. 

  1429.     return 1;

  1430. }

  1431. 

  1432. /**

  1433.  * Called when the next partition or EOF is encountered

  1434.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1435.  */

  1436. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1437. {

  1438.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1439. }

  1440. 

  1441. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1442. {

  1443.     MXFContext *mxf = s->priv_data;

  1444.     KLVPacket klv;

  1445. 

  1446.     mxf->last_forward_tell = INT64_MAX;

  1447. 

  1448.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1449.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1450.         return AVERROR_INVALIDDATA;

  1451.     }

  1452.     avio_seek(s->pb, -14, SEEK_CUR);

  1453.     mxf->fc = s;

  1454.     mxf->run_in = avio_tell(s->pb);

  1455. 

  1456.     while (!s->pb->eof_reached) {

  1457.         const MXFMetadataReadTableEntry *metadata;

  1458. 

  1459.         if (klv_read_packet(&klv, s->pb) < 0) {

  1460.             /* EOF - seek to previous partition or stop */

  1461.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1462.                 break;

  1463.             else

  1464.                 continue;

  1465.         }

  1466. 

  1467.         PRINT_KEY(s, "read header", klv.key);

  1468.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1469.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1470.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1471.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1472.         if (IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1473.             mxf->system_item = 1;

  1474.         }

  1475. 

  1476.             if (!mxf->essence_offset)

  1477.                 mxf->essence_offset = klv.offset;

  1478. 

  1479.             if (!mxf->first_essence_kl_length && IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

  1480.                 mxf->first_essence_kl_length = avio_tell(s->pb) - klv.offset;

  1481.                 mxf->first_essence_length = klv.length;

  1482.             }

  1483. 

  1484.             /* seek to footer, previous partition or stop */

  1485.             if (mxf_parse_handle_essence(mxf) <= 0)

  1486.                 break;

  1487.             continue;

  1488.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1489.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1490.             /* next partition pack - keep going, seek to previous partition or stop */

  1491.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1492.                 break;

  1493.         }

  1494. 

  1495.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1496.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1497.                 int res;

  1498.                 if (klv.key[5] == 0x53) {

  1499.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1500.                 } else {

  1501.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1502.                     res = metadata->read(mxf, s->pb, 0, 0, klv.key);

  1503.                     avio_seek(s->pb, next, SEEK_SET);

  1504.                 }

  1505.                 if (res < 0) {

  1506.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1507.                     return res;

  1508.                 }

  1509.                 break;

  1510.             }

  1511.         }

  1512.         if (!metadata->read)

  1513.             avio_skip(s->pb, klv.length);

  1514.     }

  1515.     /* FIXME avoid seek */

  1516.     if (!mxf->essence_offset)  {

  1517.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1518.         return AVERROR_INVALIDDATA;

  1519.     }

  1520.     avio_seek(s->pb, mxf->essence_offset, SEEK_SET);

  1521.     return mxf_parse_structural_metadata(mxf);

  1522. }

  1523. 

  1524. static int mxf_read_close(AVFormatContext *s)

  1525. {

  1526.     MXFContext *mxf = s->priv_data;

  1527.     MXFIndexTableSegment *seg;

  1528.     int i, j;

  1529. 

  1530.     av_freep(&mxf->packages_refs);

  1531. 

  1532.     for (i = 0; i < s->nb_streams; i++)

  1533.         s->streams[i]->priv_data = NULL;

  1534. 

  1535.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1536.         switch (mxf->metadata_sets[i]->type) {

  1537.         case MultipleDescriptor:

  1538.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1539.             break;

  1540.         case Sequence:

  1541.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1542.             break;

  1543.         case SourcePackage:

  1544.         case MaterialPackage:

  1545.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1546.             break;

  1547.         case IndexTableSegment:

  1548.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1549.             if (seg->slice_count)

  1550.                 for (j = 0; j < seg->nb_index_entries; j++)

  1551.                     av_freep(&seg->slice_offset_entries[j]);

  1552.             av_freep(&seg->slice);

  1553.             av_freep(&seg->element_delta);

  1554.             av_freep(&seg->flag_entries);

  1555.             av_freep(&seg->stream_offset_entries);

  1556.             av_freep(&seg->slice_offset_entries);

  1557.             break;

  1558.         default:

  1559.             break;

  1560.         }

  1561.         av_freep(&mxf->metadata_sets[i]);

  1562.     }

  1563.     av_freep(&mxf->partitions);

  1564.     av_freep(&mxf->metadata_sets);

  1565.     av_freep(&mxf->aesc);

  1566.     av_freep(&mxf->local_tags);

  1567.     return 0;

  1568. }

  1569. 

  1570. static int mxf_probe(AVProbeData *p) {

  1571.     uint8_t *bufp = p->buf;

  1572.     uint8_t *end = p->buf + p->buf_size;

  1573. 

  1574.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1575.         return 0;

  1576. 

  1577.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1578.     end -= sizeof(mxf_header_partition_pack_key);

  1579.     for (; bufp < end; bufp++) {

  1580.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1581.             return AVPROBE_SCORE_MAX;

  1582.     }

  1583.     return 0;

  1584. }

  1585. 

  1586. /* rudimentary byte seek */

  1587. /* XXX: use MXF Index */

  1588. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1589. {

  1590.     AVStream *st = s->streams[stream_index];

  1591.     int64_t seconds;

  1592.     int ret;

  1593. 

  1594.     if (!s->bit_rate)

  1595.         return AVERROR_INVALIDDATA;

  1596.     if (sample_time < 0)

  1597.         sample_time = 0;

  1598.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1599. 

  1600.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  1601.         return ret;

  1602.     ff_update_cur_dts(s, st, sample_time);

  1603.     return 0;

  1604. }

  1605. 

  1606. AVInputFormat ff_mxf_demuxer = {

  1607.     .name           = "mxf",

  1608.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1609.     .priv_data_size = sizeof(MXFContext),

  1610.     .read_probe     = mxf_probe,

  1611.     .read_header    = mxf_read_header,

  1612.     .read_packet    = mxf_read_packet,

  1613.     .read_close     = mxf_read_close,

  1614.     .read_seek      = mxf_read_seek,

  1615. };