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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. //#define DEBUG

  47. 

  48. #include "libavutil/aes.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavcodec/bytestream.h"

  51. #include "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.     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. } MXFTrack;

  125. 

  126. typedef struct {

  127.     UID uid;

  128.     enum MXFMetadataSetType type;

  129.     UID essence_container_ul;

  130.     UID essence_codec_ul;

  131.     AVRational sample_rate;

  132.     AVRational aspect_ratio;

  133.     int width;

  134.     int height;

  135.     int channels;

  136.     int bits_per_sample;

  137.     UID *sub_descriptors_refs;

  138.     int sub_descriptors_count;

  139.     int linked_track_id;

  140.     uint8_t *extradata;

  141.     int extradata_size;

  142.     enum PixelFormat pix_fmt;

  143. } MXFDescriptor;

  144. 

  145. typedef struct {

  146.     UID uid;

  147.     enum MXFMetadataSetType type;

  148.     int edit_unit_byte_count;

  149.     int index_sid;

  150.     int body_sid;

  151.     int slice_count;

  152.     AVRational index_edit_rate;

  153.     uint64_t index_start_position;

  154.     uint64_t index_duration;

  155.     int *slice;

  156.     int *element_delta;

  157.     int nb_delta_entries;

  158.     int8_t *temporal_offset_entries;

  159.     int *flag_entries;

  160.     uint64_t *stream_offset_entries;

  161.     uint32_t **slice_offset_entries;

  162.     int nb_index_entries;

  163. } MXFIndexTableSegment;

  164. 

  165. typedef struct {

  166.     UID uid;

  167.     enum MXFMetadataSetType type;

  168.     UID package_uid;

  169.     UID *tracks_refs;

  170.     int tracks_count;

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

  172.     UID descriptor_ref;

  173. } MXFPackage;

  174. 

  175. typedef struct {

  176.     UID uid;

  177.     enum MXFMetadataSetType type;

  178. } MXFMetadataSet;

  179. 

  180. typedef struct {

  181.     MXFPartition *partitions;

  182.     unsigned partitions_count;

  183.     MXFOP op;

  184.     UID *packages_refs;

  185.     int packages_count;

  186.     MXFMetadataSet **metadata_sets;

  187.     int metadata_sets_count;

  188.     AVFormatContext *fc;

  189.     struct AVAES *aesc;

  190.     uint8_t *local_tags;

  191.     int local_tags_count;

  192.     uint64_t footer_partition;

  193.     KLVPacket current_klv_data;

  194.     int current_klv_index;

  195.     int run_in;

  196.     MXFPartition *current_partition;

  197.     int parsing_backward;

  198.     int64_t last_forward_tell;

  199.     int last_forward_partition;

  200.     int current_edit_unit;

  201.     int current_stream;

  202.     int d10;

  203.     int broken_index;

  204. } MXFContext;

  205. 

  206. enum MXFWrappingScheme {

  207.     Frame,

  208.     Clip,

  209. };

  210. 

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

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

  213. 

  214. typedef struct {

  215.     const UID key;

  216.     MXFMetadataReadFunc *read;

  217.     int ctx_size;

  218.     enum MXFMetadataSetType type;

  219. } MXFMetadataReadTableEntry;

  220. 

  221. /* partial keys to match */

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

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

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

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

  226. /* complete keys to match */

  227. 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 };

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

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

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

  231. 

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

  233. 

  234. static int64_t klv_decode_ber_length(AVIOContext *pb)

  235. {

  236.     uint64_t size = avio_r8(pb);

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

  238.         int bytes_num = size & 0x7f;

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

  240.         if (bytes_num > 8)

  241.             return -1;

  242.         size = 0;

  243.         while (bytes_num--)

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

  245.     }

  246.     return size;

  247. }

  248. 

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

  250. {

  251.     int i, b;

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

  253.         b = avio_r8(pb);

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

  255.             i = 0;

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

  257.             i = -1;

  258.     }

  259.     return i == size;

  260. }

  261. 

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

  263. {

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

  265.         return -1;

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

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

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

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

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

  271. }

  272. 

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

  274. {

  275.     int i;

  276. 

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

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

  279.         /* SMPTE 379M 7.3 */

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

  281.             return i;

  282.     }

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

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

  285. }

  286. 

  287. /* XXX: use AVBitStreamFilter */

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

  289. {

  290.     const uint8_t *buf_ptr, *end_ptr;

  291.     uint8_t *data_ptr;

  292.     int i;

  293. 

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

  295.         return -1;

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

  297.     if (length < 0)

  298.         return length;

  299.     data_ptr = pkt->data;

  300.     end_ptr = pkt->data + length;

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

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

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

  304.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  307.             else

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

  309.         }

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

  311.     }

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

  313.     return 0;

  314. }

  315. 

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

  317. {

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

  319.     MXFContext *mxf = s->priv_data;

  320.     AVIOContext *pb = s->pb;

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

  322.     int64_t size;

  323.     uint64_t orig_size;

  324.     uint64_t plaintext_size;

  325.     uint8_t ivec[16];

  326.     uint8_t tmpbuf[16];

  327.     int index;

  328. 

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

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

  331.         if (!mxf->aesc)

  332.             return -1;

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

  334.     }

  335.     // crypto context

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

  337.     // plaintext offset

  338.     klv_decode_ber_length(pb);

  339.     plaintext_size = avio_rb64(pb);

  340.     // source klv key

  341.     klv_decode_ber_length(pb);

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

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

  344.         return -1;

  345.     index = mxf_get_stream_index(s, klv);

  346.     if (index < 0)

  347.         return -1;

  348.     // source size

  349.     klv_decode_ber_length(pb);

  350.     orig_size = avio_rb64(pb);

  351.     if (orig_size < plaintext_size)

  352.         return -1;

  353.     // enc. code

  354.     size = klv_decode_ber_length(pb);

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

  356.         return -1;

  357.     avio_read(pb, ivec, 16);

  358.     avio_read(pb, tmpbuf, 16);

  359.     if (mxf->aesc)

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

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

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

  363.     size -= 32;

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

  365.     if (size < 0)

  366.         return size;

  367.     else if (size < plaintext_size)

  368.         return AVERROR_INVALIDDATA;

  369.     size -= plaintext_size;

  370.     if (mxf->aesc)

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

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

  373.     av_shrink_packet(pkt, orig_size);

  374.     pkt->stream_index = index;

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

  376.     return 0;

  377. }

  378. 

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

  380. {

  381.     KLVPacket klv;

  382. 

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

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

  385.             return -1;

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

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

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

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

  390.             if (res < 0) {

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

  392.                 return -1;

  393.             }

  394.             return 0;

  395.         }

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

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

  398.             if (index < 0) {

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

  400.                 goto skip;

  401.             }

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

  403.                 goto skip;

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

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

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

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

  408.                     return -1;

  409.                 }

  410.             } else {

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

  412.                 if (ret < 0)

  413.                     return ret;

  414.             }

  415.             pkt->stream_index = index;

  416.             pkt->pos = klv.offset;

  417.             return 0;

  418.         } else

  419.         skip:

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

  421.     }

  422.     return AVERROR_EOF;

  423. }

  424. 

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

  426. {

  427.     MXFContext *mxf = s->priv_data;

  428.     AVIndexEntry *e;

  429.     int ret;

  430.     int64_t ret64;

  431.     KLVPacket klv;

  432.     AVStream *st;

  433. 

  434.     /* TODO: better logic for this?

  435.      * only files that lack all index segments prior to the essence need this */

  436.     if (!s->pb->seekable && mxf->op != OPAtom || mxf->d10 || mxf->broken_index)

  437.         return mxf_read_packet_old(s, pkt);

  438. 

  439.     if (mxf->current_stream >= s->nb_streams) {

  440.         mxf->current_edit_unit++;

  441.         mxf->current_stream = 0;

  442.     }

  443. 

  444.     st = s->streams[mxf->current_stream];

  445. 

  446.     if (mxf->current_edit_unit >= st->nb_index_entries)

  447.         return AVERROR_EOF;

  448. 

  449.     e = &st->index_entries[mxf->current_edit_unit];

  450. 

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

  452.         return ret64;

  453. 

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

  455.         /* OPAtom - no KL, just essence */

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

  457.             return ret < 0 ? ret : AVERROR_EOF;

  458.     } else {

  459.         /* read KL, read L bytes of essence */

  460.         if ((ret = klv_read_packet(&klv, s->pb)) < 0)

  461.             return ret;

  462. 

  463.         /* untested, but looks OK */

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

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

  466.             if (res < 0) {

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

  468.                 return -1;

  469.             }

  470.             return 0;

  471.         }

  472. 

  473.         if ((ret = av_get_packet(s->pb, pkt, klv.length)) != klv.length)

  474.             return ret < 0 ? ret : AVERROR_EOF;

  475. 

  476.         pkt->pos = e->pos;

  477.     }

  478. 

  479.     pkt->stream_index = mxf->current_stream++;

  480. 

  481.     return 0;

  482. }

  483. 

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

  485. {

  486.     MXFContext *mxf = arg;

  487.     int item_num = avio_rb32(pb);

  488.     int item_len = avio_rb32(pb);

  489. 

  490.     if (item_len != 18) {

  491.         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");

  492.         return -1;

  493.     }

  494.     if (item_num > UINT_MAX / item_len)

  495.         return -1;

  496.     mxf->local_tags_count = item_num;

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

  498.     if (!mxf->local_tags)

  499.         return -1;

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

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     MXFContext *mxf = arg;

  507.     MXFPartition *partition;

  508.     UID op;

  509.     uint64_t footer_partition;

  510. 

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

  512.         return AVERROR(ENOMEM);

  513. 

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

  515.     if (!mxf->partitions)

  516.         return AVERROR(ENOMEM);

  517. 

  518.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  525.     } else {

  526.         mxf->last_forward_partition++;

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

  528.     }

  529. 

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

  531.     mxf->partitions_count++;

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

  533. 

  534.     switch(uid[13]) {

  535.     case 2:

  536.         partition->type = Header;

  537.         break;

  538.     case 3:

  539.         partition->type = BodyPartition;

  540.         break;

  541.     case 4:

  542.         partition->type = Footer;

  543.         break;

  544.     default:

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

  546.         return AVERROR_INVALIDDATA;

  547.     }

  548. 

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

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

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

  552.     avio_skip(pb, 4);

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

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

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

  556.     footer_partition = avio_rb64(pb);

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

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

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

  560.     avio_skip(pb, 8);

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

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

  563. 

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

  565.     if (footer_partition) {

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

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

  568.                    mxf->footer_partition, footer_partition);

  569.         } else {

  570.             mxf->footer_partition = footer_partition;

  571.         }

  572.     }

  573. 

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

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

  576.             partition->this_partition,

  577.             partition->previous_partition, footer_partition,

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

  579. 

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

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

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

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

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

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

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

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

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

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

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

  591.     else {

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

  593.         mxf->op = OP1a;

  594.     }

  595. 

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

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

  598. 

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

  600.             partition->kag_size = 512;

  601.         else

  602.             partition->kag_size = 1;

  603. 

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

  605.     }

  606. 

  607.     return 0;

  608. }

  609. 

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

  611. {

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

  613.         return AVERROR(ENOMEM);

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

  615.     if (!mxf->metadata_sets)

  616.         return -1;

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

  618.     mxf->metadata_sets_count++;

  619.     return 0;

  620. }

  621. 

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

  623. {

  624.     MXFCryptoContext *cryptocontext = arg;

  625.     if (size != 16)

  626.         return -1;

  627.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  629.     return 0;

  630. }

  631. 

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

  633. {

  634.     MXFContext *mxf = arg;

  635.     switch (tag) {

  636.     case 0x1901:

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

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

  639.             return -1;

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

  641.         if (!mxf->packages_refs)

  642.             return -1;

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

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

  645.         break;

  646.     }

  647.     return 0;

  648. }

  649. 

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

  651. {

  652.     MXFStructuralComponent *source_clip = arg;

  653.     switch(tag) {

  654.     case 0x0202:

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

  656.         break;

  657.     case 0x1201:

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

  659.         break;

  660.     case 0x1101:

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

  662.         avio_skip(pb, 16);

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

  664.         break;

  665.     case 0x1102:

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

  667.         break;

  668.     }

  669.     return 0;

  670. }

  671. 

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

  673. {

  674.     MXFPackage *package = arg;

  675.     switch(tag) {

  676.     case 0x4403:

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

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

  679.             return -1;

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

  681.         if (!package->tracks_refs)

  682.             return -1;

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

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

  685.         break;

  686.     }

  687.     return 0;

  688. }

  689. 

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

  691. {

  692.     MXFTrack *track = arg;

  693.     switch(tag) {

  694.     case 0x4801:

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

  696.         break;

  697.     case 0x4804:

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

  699.         break;

  700.     case 0x4B01:

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

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

  703.         break;

  704.     case 0x4803:

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

  706.         break;

  707.     }

  708.     return 0;

  709. }

  710. 

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

  712. {

  713.     MXFSequence *sequence = arg;

  714.     switch(tag) {

  715.     case 0x0202:

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

  717.         break;

  718.     case 0x0201:

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

  720.         break;

  721.     case 0x1001:

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

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

  724.             return -1;

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

  726.         if (!sequence->structural_components_refs)

  727.             return -1;

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

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

  730.         break;

  731.     }

  732.     return 0;

  733. }

  734. 

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

  736. {

  737.     MXFPackage *package = arg;

  738.     switch(tag) {

  739.     case 0x4403:

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

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

  742.             return -1;

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

  744.         if (!package->tracks_refs)

  745.             return -1;

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

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

  748.         break;

  749.     case 0x4401:

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

  751.         avio_skip(pb, 16);

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

  753.         break;

  754.     case 0x4701:

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

  756.         break;

  757.     }

  758.     return 0;

  759. }

  760. 

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

  762. {

  763.     int i, length;

  764. 

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

  766.     length = avio_rb32(pb);

  767. 

  768.     if (!(segment->slice         = av_calloc(segment->nb_delta_entries, sizeof(*segment->slice))) ||

  769.         !(segment->element_delta = av_calloc(segment->nb_delta_entries, sizeof(*segment->element_delta))))

  770.         return AVERROR(ENOMEM);

  771. 

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

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

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

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

  776.     }

  777.     return 0;

  778. }

  779. 

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

  781. {

  782.     int i, j, length;

  783. 

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

  785.     length = avio_rb32(pb);

  786. 

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

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

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

  790.         return AVERROR(ENOMEM);

  791. 

  792.     if (segment->slice_count &&

  793.         !(segment->slice_offset_entries  = av_calloc(segment->nb_index_entries, sizeof(*segment->slice_offset_entries))))

  794.         return AVERROR(ENOMEM);

  795. 

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

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

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

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

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

  801.         if (segment->slice_count) {

  802.             if (!(segment->slice_offset_entries[i] = av_calloc(segment->slice_count, sizeof(**segment->slice_offset_entries))))

  803.                 return AVERROR(ENOMEM);

  804. 

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

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

  807.         }

  808. 

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

  810.     }

  811.     return 0;

  812. }

  813. 

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

  815. {

  816.     MXFIndexTableSegment *segment = arg;

  817.     switch(tag) {

  818.     case 0x3F05:

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

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

  821.         break;

  822.     case 0x3F06:

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

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

  825.         break;

  826.     case 0x3F07:

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

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

  829.         break;

  830.     case 0x3F08:

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

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

  833.         break;

  834.     case 0x3F09:

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

  836.         return mxf_read_delta_entry_array(pb, segment);

  837.     case 0x3F0A:

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

  839.         return mxf_read_index_entry_array(pb, segment);

  840.     case 0x3F0B:

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

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

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

  844.                 segment->index_edit_rate.den);

  845.         break;

  846.     case 0x3F0C:

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

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

  849.         break;

  850.     case 0x3F0D:

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

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

  853.         break;

  854.     }

  855.     return 0;

  856. }

  857. 

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

  859. {

  860.     int code, value, ofs = 0;

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

  862. 

  863.     do {

  864.         code = avio_r8(pb);

  865.         value = avio_r8(pb);

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

  867. 

  868.         if (ofs < 16) {

  869.             layout[ofs++] = code;

  870.             layout[ofs++] = value;

  871.         }

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

  873. 

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

  875. }

  876. 

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

  878. {

  879.     MXFDescriptor *descriptor = arg;

  880.     switch(tag) {

  881.     case 0x3F01:

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

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

  884.             return -1;

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

  886.         if (!descriptor->sub_descriptors_refs)

  887.             return -1;

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

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

  890.         break;

  891.     case 0x3004:

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

  893.         break;

  894.     case 0x3006:

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

  896.         break;

  897.     case 0x3201: /* PictureEssenceCoding */

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

  899.         break;

  900.     case 0x3203:

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

  902.         break;

  903.     case 0x3202:

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

  905.         break;

  906.     case 0x320E:

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

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

  909.         break;

  910.     case 0x3D03:

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

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

  913.         break;

  914.     case 0x3D06: /* SoundEssenceCompression */

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

  916.         break;

  917.     case 0x3D07:

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

  919.         break;

  920.     case 0x3D01:

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

  922.         break;

  923.     case 0x3401:

  924.         mxf_read_pixel_layout(pb, descriptor);

  925.         break;

  926.     default:

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

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

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

  930.             if (!descriptor->extradata)

  931.                 return -1;

  932.             descriptor->extradata_size = size;

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

  934.         }

  935.         break;

  936.     }

  937.     return 0;

  938. }

  939. 

  940. /*

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

  942.  * Returns: boolean

  943.  */

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

  945. {

  946.     int i;

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

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

  949.             return 0;

  950.     }

  951.     return 1;

  952. }

  953. 

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

  955. {

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

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

  958.             break;

  959.         uls++;

  960.     }

  961.     return uls;

  962. }

  963. 

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

  965. {

  966.     int i;

  967. 

  968.     if (!strong_ref)

  969.         return NULL;

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

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

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

  973.             return mxf->metadata_sets[i];

  974.         }

  975.     }

  976.     return NULL;

  977. }

  978. 

  979. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  980.     // video essence container uls

  981.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  982.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  983.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  984. };

  985. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  986.     // sound essence container uls

  987.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  988.     { { 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 */

  989.     { { 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 */

  990.     { { 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 */

  991.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },

  992. };

  993. 

  994. static UID mxf_d10_ul = { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 };

  995. 

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

  997. {

  998.     int i, j, nb_segments = 0;

  999.     MXFIndexTableSegment **unsorted_segments;

  1000.     int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;

  1001. 

  1002.     /* count number of segments, allocate arrays and copy unsorted segments */

  1003.     for (i = 0; i < mxf->metadata_sets_count; i++)

  1004.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  1005.             nb_segments++;

  1006. 

  1007.     if (!(unsorted_segments = av_calloc(nb_segments, sizeof(*unsorted_segments))) ||

  1008.         !(*sorted_segments  = av_calloc(nb_segments, sizeof(**sorted_segments)))) {

  1009.         av_free(unsorted_segments);

  1010.         return AVERROR(ENOMEM);

  1011.     }

  1012. 

  1013.     for (i = j = 0; i < mxf->metadata_sets_count; i++)

  1014.         if (mxf->metadata_sets[i]->type == IndexTableSegment)

  1015.             unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];

  1016. 

  1017.     *nb_sorted_segments = 0;

  1018. 

  1019.     /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */

  1020.     for (i = 0; i < nb_segments; i++) {

  1021.         int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;

  1022. 

  1023.         for (j = 0; j < nb_segments; j++) {

  1024.             MXFIndexTableSegment *s = unsorted_segments[j];

  1025. 

  1026.             /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.

  1027.              * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.

  1028.              */

  1029.             if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&

  1030.                 (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start)) {

  1031.                 best             = j;

  1032.                 best_body_sid    = s->body_sid;

  1033.                 best_index_sid   = s->index_sid;

  1034.                 best_index_start = s->index_start_position;

  1035.             }

  1036.         }

  1037. 

  1038.         /* no suitable entry found -> we're done */

  1039.         if (best == -1)

  1040.             break;

  1041. 

  1042.         (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];

  1043.         last_body_sid    = best_body_sid;

  1044.         last_index_sid   = best_index_sid;

  1045.         last_index_start = best_index_start;

  1046.     }

  1047. 

  1048.     av_free(unsorted_segments);

  1049. 

  1050.     return 0;

  1051. }

  1052. 

  1053. /**

  1054.  * Computes the absolute file offset of the given essence container offset

  1055.  */

  1056. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1057. {

  1058.     int x;

  1059.     int64_t offset_in = offset;     /* for logging */

  1060. 

  1061.     for (x = 0; x < mxf->partitions_count; x++) {

  1062.         MXFPartition *p = &mxf->partitions[x];

  1063. 

  1064.         if (p->body_sid != body_sid)

  1065.             continue;

  1066. 

  1067.         if (offset < p->essence_length || !p->essence_length) {

  1068.             *offset_out = p->essence_offset + offset;

  1069.             return 0;

  1070.         }

  1071. 

  1072.         offset -= p->essence_length;

  1073.     }

  1074. 

  1075.     av_log(mxf->fc, AV_LOG_ERROR, "failed to find absolute offset of %lx in BodySID %i - partial file?\n",

  1076.            offset_in, body_sid);

  1077. 

  1078.     return AVERROR_INVALIDDATA;

  1079. }

  1080. 

  1081. static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)

  1082. {

  1083.     int j, k, ret, nb_sorted_segments;

  1084.     MXFIndexTableSegment **sorted_segments = NULL;

  1085.     int n_delta = track_id - 1;  /* TrackID = 1-based stream index */

  1086. 

  1087.     if (track_id < 1) {

  1088.         av_log(mxf->fc, AV_LOG_ERROR, "TrackID not positive: %i\n", track_id);

  1089.         ret = AVERROR_INVALIDDATA;

  1090.         goto err_out;

  1091.     }

  1092. 

  1093.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)))

  1094.         goto err_out;

  1095. 

  1096.     if (nb_sorted_segments <= 0) {

  1097.         av_log(mxf->fc, AV_LOG_WARNING, "Empty index for stream %i\n", st->index);

  1098.         ret = 0;

  1099.         goto err_out;

  1100.     }

  1101. 

  1102.     for (j = 0; j < nb_sorted_segments; j++) {

  1103.         int duration, sample_duration = 1, last_sample_size = 0;

  1104.         int64_t segment_size;

  1105.         MXFIndexTableSegment *tableseg = sorted_segments[j];

  1106. 

  1107.         if (n_delta >= tableseg->nb_delta_entries && st->index != 0)

  1108.             continue;

  1109.         duration = tableseg->index_duration > 0 ? tableseg->index_duration :

  1110.             st->duration - st->nb_index_entries;

  1111.         segment_size = tableseg->edit_unit_byte_count * duration;

  1112.         /* check small EditUnitByteCount for audio */

  1113.         if (tableseg->edit_unit_byte_count && tableseg->edit_unit_byte_count < 32

  1114.             && !tableseg->index_duration) {

  1115.             /* duration might be prime relative to the new sample_duration,

  1116.              * which means we need to handle the last frame differently */

  1117.             sample_duration = 8192;

  1118.             last_sample_size = (duration % sample_duration) * tableseg->edit_unit_byte_count;

  1119.             tableseg->edit_unit_byte_count *= sample_duration;

  1120.             duration /= sample_duration;

  1121.             if (last_sample_size) duration++;

  1122.         }

  1123. 

  1124.         if (duration <= 0) {

  1125.             av_log(mxf->fc, AV_LOG_WARNING, "0 duration in index for stream %i\n", st->index);

  1126.             ret = 0;

  1127.             goto err_out;

  1128.         }

  1129. 

  1130.         for (k = 0; k < duration; k++) {

  1131.             int64_t pos;

  1132.             int size, flags = 0;

  1133. 

  1134.             if (k < tableseg->nb_index_entries) {

  1135.                 pos = tableseg->stream_offset_entries[k];

  1136.                 if (n_delta < tableseg->nb_delta_entries) {

  1137.                     if (n_delta < tableseg->nb_delta_entries - 1) {

  1138.                         size =

  1139.                             tableseg->slice_offset_entries[k][tableseg->slice[n_delta+1]-1] +

  1140.                             tableseg->element_delta[n_delta+1] -

  1141.                             tableseg->element_delta[n_delta];

  1142.                         if (tableseg->slice[n_delta] > 0)

  1143.                             size -= tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1144.                     } else if (k < duration - 1) {

  1145.                         size = tableseg->stream_offset_entries[k+1] -

  1146.                             tableseg->stream_offset_entries[k] -

  1147.                             tableseg->slice_offset_entries[k][tableseg->slice[tableseg->nb_delta_entries-1]-1] -

  1148.                             tableseg->element_delta[tableseg->nb_delta_entries-1];

  1149.                     } else

  1150.                         size = 0;

  1151.                     if (tableseg->slice[n_delta] > 0)

  1152.                         pos += tableseg->slice_offset_entries[k][tableseg->slice[n_delta]-1];

  1153.                     pos += tableseg->element_delta[n_delta];

  1154.                 } else

  1155.                     size = 0;

  1156.                 flags = !(tableseg->flag_entries[k] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1157.             } else {

  1158.                 pos = (int64_t)(tableseg->index_start_position + k) * tableseg->edit_unit_byte_count;

  1159.                 if (n_delta < tableseg->nb_delta_entries - 1)

  1160.                     size = tableseg->element_delta[n_delta+1] - tableseg->element_delta[n_delta];

  1161.                 else {

  1162.                     /* use smaller size for last sample if we should */

  1163.                     if (last_sample_size && k == duration - 1)

  1164.                         size = last_sample_size;

  1165.                     else

  1166.                         size = tableseg->edit_unit_byte_count;

  1167.                     if (tableseg->nb_delta_entries)

  1168.                         size -= tableseg->element_delta[tableseg->nb_delta_entries-1];

  1169.                 }

  1170.                 if (n_delta < tableseg->nb_delta_entries)

  1171.                     pos += tableseg->element_delta[n_delta];

  1172.                 flags = AVINDEX_KEYFRAME;

  1173.             }

  1174. 

  1175.             if (mxf_absolute_bodysid_offset(mxf, tableseg->body_sid, pos, &pos) < 0) {

  1176.                 /* probably partial file - no point going further for this stream */

  1177.                 break;

  1178.             }

  1179. 

  1180.             av_dlog(mxf->fc, "Stream %d IndexEntry %d TrackID %d Offset %"PRIx64" Timestamp %"PRId64"\n",

  1181.                     st->index, st->nb_index_entries, track_id, pos, sample_duration * st->nb_index_entries);

  1182. 

  1183.             if ((ret = av_add_index_entry(st, pos, sample_duration * st->nb_index_entries, size, 0, flags)) < 0)

  1184.                 return ret;

  1185.         }

  1186.     }

  1187. 

  1188.     av_free(sorted_segments);

  1189. 

  1190.     return 0;

  1191. 

  1192. err_out:

  1193.     av_free(sorted_segments);

  1194.     mxf->broken_index = 1;

  1195.     return ret;

  1196. }

  1197. 

  1198. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1199. {

  1200.     MXFPackage *material_package = NULL;

  1201.     MXFPackage *temp_package = NULL;

  1202.     int i, j, k, ret;

  1203. 

  1204.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1205.     /* TODO: handle multiple material packages (OP3x) */

  1206.     for (i = 0; i < mxf->packages_count; i++) {

  1207.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1208.         if (material_package) break;

  1209.     }

  1210.     if (!material_package) {

  1211.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1212.         return -1;

  1213.     }

  1214. 

  1215.     for (i = 0; i < material_package->tracks_count; i++) {

  1216.         MXFPackage *source_package = NULL;

  1217.         MXFTrack *material_track = NULL;

  1218.         MXFTrack *source_track = NULL;

  1219.         MXFTrack *temp_track = NULL;

  1220.         MXFDescriptor *descriptor = NULL;

  1221.         MXFStructuralComponent *component = NULL;

  1222.         UID *essence_container_ul = NULL;

  1223.         const MXFCodecUL *codec_ul = NULL;

  1224.         const MXFCodecUL *container_ul = NULL;

  1225.         AVStream *st;

  1226. 

  1227.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1228.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1229.             continue;

  1230.         }

  1231. 

  1232.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1233.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1234.             continue;

  1235.         }

  1236. 

  1237.         /* TODO: handle multiple source clips */

  1238.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1239.             /* TODO: handle timecode component */

  1240.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1241.             if (!component)

  1242.                 continue;

  1243. 

  1244.             for (k = 0; k < mxf->packages_count; k++) {

  1245.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1246.                 if (!temp_package)

  1247.                     continue;

  1248.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1249.                     source_package = temp_package;

  1250.                     break;

  1251.                 }

  1252.             }

  1253.             if (!source_package) {

  1254.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1255.                 break;

  1256.             }

  1257.             for (k = 0; k < source_package->tracks_count; k++) {

  1258.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1259.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1260.                     return -1;

  1261.                 }

  1262.                 if (temp_track->track_id == component->source_track_id) {

  1263.                     source_track = temp_track;

  1264.                     break;

  1265.                 }

  1266.             }

  1267.             if (!source_track) {

  1268.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1269.                 break;

  1270.             }

  1271.         }

  1272.         if (!source_track)

  1273.             continue;

  1274. 

  1275.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1276.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1277.             return -1;

  1278.         }

  1279. 

  1280.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1281.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1282.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1283.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1284.             continue;

  1285.         }

  1286. 

  1287.         st = avformat_new_stream(mxf->fc, NULL);

  1288.         if (!st) {

  1289.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1290.             return -1;

  1291.         }

  1292.         st->id = source_track->track_id;

  1293.         st->priv_data = source_track;

  1294.         st->duration = component->duration;

  1295.         if (st->duration == -1)

  1296.             st->duration = AV_NOPTS_VALUE;

  1297.         st->start_time = component->start_position;

  1298.         avpriv_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);

  1299. 

  1300.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1301.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1302.         st->codec->codec_type = codec_ul->id;

  1303. 

  1304.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1305.         if (source_package->descriptor) {

  1306.             if (source_package->descriptor->type == MultipleDescriptor) {

  1307.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1308.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1309. 

  1310.                     if (!sub_descriptor) {

  1311.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1312.                         continue;

  1313.                     }

  1314.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1315.                         descriptor = sub_descriptor;

  1316.                         break;

  1317.                     }

  1318.                 }

  1319.             } else if (source_package->descriptor->type == Descriptor)

  1320.                 descriptor = source_package->descriptor;

  1321.         }

  1322.         if (!descriptor) {

  1323.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1324.             continue;

  1325.         }

  1326.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1327.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1328.         essence_container_ul = &descriptor->essence_container_ul;

  1329.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1330.          * is not allowed according to s429-6, try to find correct information anyway */

  1331.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1332.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1333.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1334.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1335.                 if (metadata->type == CryptoContext) {

  1336.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1337.                     break;

  1338.                 }

  1339.             }

  1340.         }

  1341. 

  1342.         /* HACK: revert to the old demuxing/seeking scode for D-10 for now */

  1343.         if (mxf_match_uid(essence_container_ul, mxf_d10_ul, 14))

  1344.             mxf->d10 = 1;

  1345. 

  1346.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1347.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1348.         st->codec->codec_id = codec_ul->id;

  1349.         if (descriptor->extradata) {

  1350.             st->codec->extradata = descriptor->extradata;

  1351.             st->codec->extradata_size = descriptor->extradata_size;

  1352.         }

  1353.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1354.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1355.             if (st->codec->codec_id == CODEC_ID_NONE)

  1356.                 st->codec->codec_id = container_ul->id;

  1357.             st->codec->width = descriptor->width;

  1358.             st->codec->height = descriptor->height;

  1359.             if (st->codec->codec_id == CODEC_ID_RAWVIDEO)

  1360.                 st->codec->pix_fmt = descriptor->pix_fmt;

  1361.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1362.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1363.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1364.             if (st->codec->codec_id == CODEC_ID_NONE)

  1365.                 st->codec->codec_id = container_ul->id;

  1366.             st->codec->channels = descriptor->channels;

  1367.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1368.             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1369.             /* TODO: implement CODEC_ID_RAWAUDIO */

  1370.             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {

  1371.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1372.                     st->codec->codec_id = CODEC_ID_PCM_S24LE;

  1373.                 else if (descriptor->bits_per_sample == 32)

  1374.                     st->codec->codec_id = CODEC_ID_PCM_S32LE;

  1375.             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {

  1376.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1377.                     st->codec->codec_id = CODEC_ID_PCM_S24BE;

  1378.                 else if (descriptor->bits_per_sample == 32)

  1379.                     st->codec->codec_id = CODEC_ID_PCM_S32BE;

  1380.             } else if (st->codec->codec_id == CODEC_ID_MP2) {

  1381.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1382.             }

  1383.         }

  1384.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1385.             /* TODO: decode timestamps */

  1386.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1387.         }

  1388. 

  1389.         if ((ret = mxf_parse_index(mxf, material_track->track_id, st)))

  1390.             return ret;

  1391.     }

  1392.     return 0;

  1393. }

  1394. 

  1395. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1396.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1397.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1398.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1399.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1400.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1401.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1402.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1403.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1404.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1405.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

  1406.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },

  1407.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1408.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1409.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1410.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1411.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1412.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1413.     { { 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 */

  1414.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1415.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1416.     { { 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 */

  1417.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1418.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1419.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1420.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1421.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1422.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1423.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1424. };

  1425. 

  1426. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1427. {

  1428.     AVIOContext *pb = mxf->fc->pb;

  1429.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1430.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1431. 

  1432.     if (!ctx)

  1433.         return -1;

  1434.     while (avio_tell(pb) + 4 < klv_end) {

  1435.         int tag = avio_rb16(pb);

  1436.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1437.         uint64_t next = avio_tell(pb) + size;

  1438.         UID uid = {0};

  1439. 

  1440.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1441.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1442.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1443.             continue;

  1444.         }

  1445.         if (tag > 0x7FFF) { /* dynamic tag */

  1446.             int i;

  1447.             for (i = 0; i < mxf->local_tags_count; i++) {

  1448.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1449.                 if (local_tag == tag) {

  1450.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1451.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1452.                     PRINT_KEY(mxf->fc, "uid", uid);

  1453.                 }

  1454.             }

  1455.         }

  1456.         if (ctx_size && tag == 0x3C0A)

  1457.             avio_read(pb, ctx->uid, 16);

  1458.         else if (read_child(ctx, pb, tag, size, uid, -1) < 0)

  1459.             return -1;

  1460. 

  1461.         avio_seek(pb, next, SEEK_SET);

  1462.     }

  1463.     if (ctx_size) ctx->type = type;

  1464.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1465. }

  1466. 

  1467. /**

  1468.  * Seeks to the previous partition, if possible

  1469.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1470.  */

  1471. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1472. {

  1473.     AVIOContext *pb = mxf->fc->pb;

  1474. 

  1475.     if (!mxf->current_partition ||

  1476.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1477.         return 0;   /* we've parsed all partitions */

  1478. 

  1479.     /* seek to previous partition */

  1480.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1481.     mxf->current_partition = NULL;

  1482. 

  1483.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1484. 

  1485.     return 1;

  1486. }

  1487. 

  1488. /**

  1489.  * Called when essence is encountered

  1490.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1491.  */

  1492. static int mxf_parse_handle_essence(MXFContext *mxf)

  1493. {

  1494.     AVIOContext *pb = mxf->fc->pb;

  1495.     int64_t ret;

  1496. 

  1497.     if (!mxf->current_partition) {

  1498.         av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to PartitionPack\n");

  1499.         return AVERROR_INVALIDDATA;

  1500.     }

  1501. 

  1502.     if (mxf->parsing_backward) {

  1503.         return mxf_seek_to_previous_partition(mxf);

  1504.     } else {

  1505.         if (!mxf->footer_partition) {

  1506.             av_dlog(mxf->fc, "no footer\n");

  1507.             return 0;

  1508.         }

  1509. 

  1510.         av_dlog(mxf->fc, "seeking to footer\n");

  1511. 

  1512.         /* remember where we were so we don't end up seeking further back than this */

  1513.         mxf->last_forward_tell = avio_tell(pb);

  1514. 

  1515.         if (!pb->seekable) {

  1516.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1517.             return -1;

  1518.         }

  1519. 

  1520.         /* seek to footer partition and parse backward */

  1521.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1522.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1523.                    mxf->run_in + mxf->footer_partition, ret);

  1524.             return ret;

  1525.         }

  1526. 

  1527.         mxf->current_partition = NULL;

  1528.         mxf->parsing_backward = 1;

  1529.     }

  1530. 

  1531.     return 1;

  1532. }

  1533. 

  1534. /**

  1535.  * Called when the next partition or EOF is encountered

  1536.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1537.  */

  1538. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1539. {

  1540.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1541. }

  1542. 

  1543. /**

  1544.  * Figures out the proper offset and length of the essence container in each partition

  1545.  */

  1546. static void mxf_compute_essence_containers(MXFContext *mxf)

  1547. {

  1548.     int x;

  1549. 

  1550.     /* everything is already correct */

  1551.     if (mxf->op == OPAtom)

  1552.         return;

  1553. 

  1554.     for (x = 0; x < mxf->partitions_count; x++) {

  1555.         MXFPartition *p = &mxf->partitions[x];

  1556. 

  1557.         if (!p->body_sid)

  1558.             continue;       /* BodySID == 0 -> no essence */

  1559. 

  1560.         if (x >= mxf->partitions_count - 1)

  1561.             break;          /* last partition - can't compute length (and we don't need to) */

  1562. 

  1563.         /* essence container spans to the next partition */

  1564.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1565. 

  1566.         if (p->essence_length < 0) {

  1567.             /* next ThisPartition < essence_offset */

  1568.             p->essence_length = 0;

  1569.             av_log(mxf->fc, AV_LOG_ERROR, "partition %i: bad ThisPartition = %lx\n",

  1570.                    x+1, mxf->partitions[x+1].this_partition);

  1571.         }

  1572.     }

  1573. }

  1574. 

  1575. static int64_t round_to_kag(int64_t position, int kag_size)

  1576. {

  1577.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1578.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1579.     int64_t ret = (position / kag_size) * kag_size;

  1580.     return ret == position ? ret : ret + kag_size;

  1581. }

  1582. 

  1583. static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)

  1584. {

  1585.     MXFContext *mxf = s->priv_data;

  1586.     KLVPacket klv;

  1587.     int64_t essence_offset = 0;

  1588. 

  1589.     mxf->last_forward_tell = INT64_MAX;

  1590. 

  1591.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1592.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1593.         return -1;

  1594.     }

  1595.     avio_seek(s->pb, -14, SEEK_CUR);

  1596.     mxf->fc = s;

  1597.     mxf->run_in = avio_tell(s->pb);

  1598. 

  1599.     while (!url_feof(s->pb)) {

  1600.         const MXFMetadataReadTableEntry *metadata;

  1601. 

  1602.         if (klv_read_packet(&klv, s->pb) < 0) {

  1603.             /* EOF - seek to previous partition or stop */

  1604.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1605.                 break;

  1606.             else

  1607.                 continue;

  1608.         }

  1609. 

  1610.         PRINT_KEY(s, "read header", klv.key);

  1611.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1612.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1613.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1614.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1615.             if (!mxf->current_partition->essence_offset) {

  1616.                 /* for OP1a we compute essence_offset

  1617.                  * for OPAtom we point essence_offset after the KL (usually op1a_essence_offset + 20 or 25)

  1618.                  * TODO: for OP1a we could eliminate this entire if statement, always stopping parsing at op1a_essence_offset

  1619.                  *       for OPAtom we still need the actual essence_offset though (the KL's length can vary)

  1620.                  */

  1621.                 int64_t op1a_essence_offset =

  1622.                     round_to_kag(mxf->current_partition->this_partition +

  1623.                                  mxf->current_partition->pack_length,       mxf->current_partition->kag_size) +

  1624.                     round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +

  1625.                     round_to_kag(mxf->current_partition->index_byte_count,  mxf->current_partition->kag_size);

  1626. 

  1627.                 if (mxf->op == OPAtom) {

  1628.                     /* point essence_offset to the actual data

  1629.                     * OPAtom has all the essence in one big KLV

  1630.                     */

  1631.                     mxf->current_partition->essence_offset = avio_tell(s->pb);

  1632.                     mxf->current_partition->essence_length = klv.length;

  1633.                 } else {

  1634.                     /* NOTE: op1a_essence_offset may be less than to klv.offset (C0023S01.mxf)  */

  1635.                     mxf->current_partition->essence_offset = op1a_essence_offset;

  1636.                 }

  1637.             }

  1638. 

  1639.             if (!essence_offset)

  1640.                 essence_offset = klv.offset;

  1641. 

  1642.             /* seek to footer, previous partition or stop */

  1643.             if (mxf_parse_handle_essence(mxf) <= 0)

  1644.                 break;

  1645.             continue;

  1646.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1647.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1648.             /* next partition pack - keep going, seek to previous partition or stop */

  1649.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1650.                 break;

  1651.         }

  1652. 

  1653.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1654.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1655.                 int res;

  1656.                 if (klv.key[5] == 0x53) {

  1657.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1658.                 } else {

  1659.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1660.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1661.                     avio_seek(s->pb, next, SEEK_SET);

  1662.                 }

  1663.                 if (res < 0) {

  1664.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1665.                     return -1;

  1666.                 }

  1667.                 break;

  1668.             }

  1669.         }

  1670.         if (!metadata->read)

  1671.             avio_skip(s->pb, klv.length);

  1672.     }

  1673.     /* FIXME avoid seek */

  1674.     if (!essence_offset)  {

  1675.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1676.         return AVERROR_INVALIDDATA;

  1677.     }

  1678.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1679. 

  1680.     mxf_compute_essence_containers(mxf);

  1681. 

  1682.     return mxf_parse_structural_metadata(mxf);

  1683. }

  1684. 

  1685. static int mxf_read_close(AVFormatContext *s)

  1686. {

  1687.     MXFContext *mxf = s->priv_data;

  1688.     MXFIndexTableSegment *seg;

  1689.     int i, j;

  1690. 

  1691.     av_freep(&mxf->packages_refs);

  1692. 

  1693.     for (i = 0; i < s->nb_streams; i++)

  1694.         s->streams[i]->priv_data = NULL;

  1695. 

  1696.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  1697.         switch (mxf->metadata_sets[i]->type) {

  1698.         case MultipleDescriptor:

  1699.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  1700.             break;

  1701.         case Sequence:

  1702.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  1703.             break;

  1704.         case SourcePackage:

  1705.         case MaterialPackage:

  1706.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  1707.             break;

  1708.         case IndexTableSegment:

  1709.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  1710.             for (j = 0; j < seg->nb_index_entries; j++)

  1711.                 av_freep(&seg->slice_offset_entries[j]);

  1712.             av_freep(&seg->slice);

  1713.             av_freep(&seg->element_delta);

  1714.             av_freep(&seg->temporal_offset_entries);

  1715.             av_freep(&seg->flag_entries);

  1716.             av_freep(&seg->stream_offset_entries);

  1717.             av_freep(&seg->slice_offset_entries);

  1718.             break;

  1719.         default:

  1720.             break;

  1721.         }

  1722.         av_freep(&mxf->metadata_sets[i]);

  1723.     }

  1724.     av_freep(&mxf->partitions);

  1725.     av_freep(&mxf->metadata_sets);

  1726.     av_freep(&mxf->aesc);

  1727.     av_freep(&mxf->local_tags);

  1728.     return 0;

  1729. }

  1730. 

  1731. static int mxf_probe(AVProbeData *p) {

  1732.     uint8_t *bufp = p->buf;

  1733.     uint8_t *end = p->buf + p->buf_size;

  1734. 

  1735.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  1736.         return 0;

  1737. 

  1738.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  1739.     end -= sizeof(mxf_header_partition_pack_key);

  1740.     for (; bufp < end; bufp++) {

  1741.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  1742.             return AVPROBE_SCORE_MAX;

  1743.     }

  1744.     return 0;

  1745. }

  1746. 

  1747. /* rudimentary byte seek */

  1748. /* XXX: use MXF Index */

  1749. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  1750. {

  1751.     AVStream *st = s->streams[stream_index];

  1752.     int64_t seconds;

  1753.     MXFContext* mxf = s->priv_data;

  1754.     int64_t seekpos;

  1755.     int index;

  1756. 

  1757.     if (mxf->d10) {

  1758.     if (!s->bit_rate)

  1759.         return -1;

  1760.     if (sample_time < 0)

  1761.         sample_time = 0;

  1762.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  1763.     if (avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET) < 0)

  1764.         return -1;

  1765.     ff_update_cur_dts(s, st, sample_time);

  1766.     } else {

  1767.         if (st->nb_index_entries <= 0)

  1768.             return -1;

  1769. 

  1770.         index = av_index_search_timestamp(st, sample_time, flags);

  1771. 

  1772.         av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, sample_time, index);

  1773. 

  1774.         if (index < 0) {

  1775.             if (sample_time < st->index_entries[0].timestamp)

  1776.                 index = 0;

  1777.             else

  1778.                 return -1;

  1779.         }

  1780. 

  1781.         seekpos = st->index_entries[index].pos;

  1782.         av_update_cur_dts(s, st, st->index_entries[index].timestamp);

  1783.         mxf->current_edit_unit = st->index_entries[index].timestamp;

  1784.         mxf->current_stream = 0;

  1785.         avio_seek(s->pb, seekpos, SEEK_SET);

  1786.     }

  1787.     return 0;

  1788. }

  1789. 

  1790. AVInputFormat ff_mxf_demuxer = {

  1791.     .name           = "mxf",

  1792.     .long_name      = NULL_IF_CONFIG_SMALL("Material eXchange Format"),

  1793.     .priv_data_size = sizeof(MXFContext),

  1794.     .read_probe     = mxf_probe,

  1795.     .read_header    = mxf_read_header,

  1796.     .read_packet    = mxf_read_packet,

  1797.     .read_close     = mxf_read_close,

  1798.     .read_seek      = mxf_read_seek,

  1799. };