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FFmpeg/libavformat/mxfdec.c

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  1. /*

  2.  * MXF demuxer.

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

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /*

  23.  * References

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

  25.  * SMPTE 377M MXF File Format Specifications

  26.  * SMPTE 378M Operational Pattern 1a

  27.  * SMPTE 379M MXF Generic Container

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

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

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

  31.  *

  32.  * Principle

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

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

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

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

  37.  * Assign Descriptors to correct Tracks.

  38.  *

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

  40.  * Metadata parsing resolves Strong References to objects.

  41.  *

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

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

  44.  */

  45. 

  46. #include "libavutil/aes.h"

  47. #include "libavutil/mathematics.h"

  48. #include "libavcodec/bytestream.h"

  49. #include "avformat.h"

  50. #include "internal.h"

  51. #include "mxf.h"

  52. 

  53. typedef enum {

  54.     Header,

  55.     BodyPartition,

  56.     Footer

  57. } MXFPartitionType;

  58. 

  59. typedef enum {

  60.     OP1a = 1,

  61.     OP1b,

  62.     OP1c,

  63.     OP2a,

  64.     OP2b,

  65.     OP2c,

  66.     OP3a,

  67.     OP3b,

  68.     OP3c,

  69.     OPAtom,

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

  71. } MXFOP;

  72. 

  73. typedef struct {

  74.     int closed;

  75.     int complete;

  76.     MXFPartitionType type;

  77.     uint64_t previous_partition;

  78.     int index_sid;

  79.     int body_sid;

  80.     int64_t this_partition;

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

  82.     int64_t essence_length;

  83.     int32_t kag_size;

  84.     int64_t header_byte_count;

  85.     int64_t index_byte_count;

  86.     int pack_length;

  87. } MXFPartition;

  88. 

  89. typedef struct {

  90.     UID uid;

  91.     enum MXFMetadataSetType type;

  92.     UID source_container_ul;

  93. } MXFCryptoContext;

  94. 

  95. typedef struct {

  96.     UID uid;

  97.     enum MXFMetadataSetType type;

  98.     UID source_package_uid;

  99.     UID data_definition_ul;

  100.     int64_t duration;

  101.     int64_t start_position;

  102.     int source_track_id;

  103. } MXFStructuralComponent;

  104. 

  105. typedef struct {

  106.     UID uid;

  107.     enum MXFMetadataSetType type;

  108.     UID data_definition_ul;

  109.     UID *structural_components_refs;

  110.     int structural_components_count;

  111.     int64_t duration;

  112. } MXFSequence;

  113. 

  114. typedef struct {

  115.     UID uid;

  116.     enum MXFMetadataSetType type;

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

  118.     UID sequence_ref;

  119.     int track_id;

  120.     uint8_t track_number[4];

  121.     AVRational edit_rate;

  122.     int intra_only;

  123. } MXFTrack;

  124. 

  125. typedef struct {

  126.     UID uid;

  127.     enum MXFMetadataSetType type;

  128.     UID essence_container_ul;

  129.     UID essence_codec_ul;

  130.     AVRational sample_rate;

  131.     AVRational aspect_ratio;

  132.     int width;

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

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

  135.     int channels;

  136.     int bits_per_sample;

  137.     unsigned int component_depth;

  138.     unsigned int horiz_subsampling;

  139.     unsigned int vert_subsampling;

  140.     UID *sub_descriptors_refs;

  141.     int sub_descriptors_count;

  142.     int linked_track_id;

  143.     uint8_t *extradata;

  144.     int extradata_size;

  145.     enum AVPixelFormat pix_fmt;

  146. } MXFDescriptor;

  147. 

  148. typedef struct {

  149.     UID uid;

  150.     enum MXFMetadataSetType type;

  151.     int edit_unit_byte_count;

  152.     int index_sid;

  153.     int body_sid;

  154.     AVRational index_edit_rate;

  155.     uint64_t index_start_position;

  156.     uint64_t index_duration;

  157.     int8_t *temporal_offset_entries;

  158.     int *flag_entries;

  159.     uint64_t *stream_offset_entries;

  160.     int nb_index_entries;

  161. } MXFIndexTableSegment;

  162. 

  163. typedef struct {

  164.     UID uid;

  165.     enum MXFMetadataSetType type;

  166.     UID package_uid;

  167.     UID *tracks_refs;

  168.     int tracks_count;

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

  170.     UID descriptor_ref;

  171. } MXFPackage;

  172. 

  173. typedef struct {

  174.     UID uid;

  175.     enum MXFMetadataSetType type;

  176. } MXFMetadataSet;

  177. 

  178. /* decoded index table */

  179. typedef struct {

  180.     int index_sid;

  181.     int body_sid;

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

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

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

  185.     int nb_segments;

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

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

  188. } MXFIndexTable;

  189. 

  190. typedef struct {

  191.     MXFPartition *partitions;

  192.     unsigned partitions_count;

  193.     MXFOP op;

  194.     UID *packages_refs;

  195.     int packages_count;

  196.     MXFMetadataSet **metadata_sets;

  197.     int metadata_sets_count;

  198.     AVFormatContext *fc;

  199.     struct AVAES *aesc;

  200.     uint8_t *local_tags;

  201.     int local_tags_count;

  202.     uint64_t footer_partition;

  203.     KLVPacket current_klv_data;

  204.     int current_klv_index;

  205.     int run_in;

  206.     MXFPartition *current_partition;

  207.     int parsing_backward;

  208.     int64_t last_forward_tell;

  209.     int last_forward_partition;

  210.     int current_edit_unit;

  211.     int nb_index_tables;

  212.     MXFIndexTable *index_tables;

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

  214. } MXFContext;

  215. 

  216. enum MXFWrappingScheme {

  217.     Frame,

  218.     Clip,

  219. };

  220. 

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

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

  223. 

  224. typedef struct {

  225.     const UID key;

  226.     MXFMetadataReadFunc *read;

  227.     int ctx_size;

  228.     enum MXFMetadataSetType type;

  229. } MXFMetadataReadTableEntry;

  230. 

  231. /* partial keys to match */

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

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

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

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

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

  237. /* complete keys to match */

  238. 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 };

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

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

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

  242. 

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

  244. 

  245. static int64_t klv_decode_ber_length(AVIOContext *pb)

  246. {

  247.     uint64_t size = avio_r8(pb);

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

  249.         int bytes_num = size & 0x7f;

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

  251.         if (bytes_num > 8)

  252.             return AVERROR_INVALIDDATA;

  253.         size = 0;

  254.         while (bytes_num--)

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

  256.     }

  257.     return size;

  258. }

  259. 

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

  261. {

  262.     int i, b;

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

  264.         b = avio_r8(pb);

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

  266.             i = 0;

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

  268.             i = -1;

  269.     }

  270.     return i == size;

  271. }

  272. 

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

  274. {

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

  276.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  282. }

  283. 

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

  285. {

  286.     int i;

  287. 

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

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

  290.         /* SMPTE 379M 7.3 */

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

  292.             return i;

  293.     }

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

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

  296. }

  297. 

  298. /* XXX: use AVBitStreamFilter */

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

  300. {

  301.     const uint8_t *buf_ptr, *end_ptr;

  302.     uint8_t *data_ptr;

  303.     int i;

  304. 

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

  306.         return AVERROR_INVALIDDATA;

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

  308.     if (length < 0)

  309.         return length;

  310.     data_ptr = pkt->data;

  311.     end_ptr = pkt->data + length;

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

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

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

  315.             uint32_t sample = bytestream_get_le32(&buf_ptr);

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

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

  318.             else

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

  320.         }

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

  322.     }

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

  324.     return 0;

  325. }

  326. 

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

  328. {

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

  330.     MXFContext *mxf = s->priv_data;

  331.     AVIOContext *pb = s->pb;

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

  333.     int64_t size;

  334.     uint64_t orig_size;

  335.     uint64_t plaintext_size;

  336.     uint8_t ivec[16];

  337.     uint8_t tmpbuf[16];

  338.     int index;

  339. 

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

  341.         mxf->aesc = av_aes_alloc();

  342.         if (!mxf->aesc)

  343.             return AVERROR(ENOMEM);

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

  345.     }

  346.     // crypto context

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

  348.     // plaintext offset

  349.     klv_decode_ber_length(pb);

  350.     plaintext_size = avio_rb64(pb);

  351.     // source klv key

  352.     klv_decode_ber_length(pb);

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

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

  355.         return AVERROR_INVALIDDATA;

  356.     index = mxf_get_stream_index(s, klv);

  357.     if (index < 0)

  358.         return AVERROR_INVALIDDATA;

  359.     // source size

  360.     klv_decode_ber_length(pb);

  361.     orig_size = avio_rb64(pb);

  362.     if (orig_size < plaintext_size)

  363.         return AVERROR_INVALIDDATA;

  364.     // enc. code

  365.     size = klv_decode_ber_length(pb);

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

  367.         return AVERROR_INVALIDDATA;

  368.     avio_read(pb, ivec, 16);

  369.     avio_read(pb, tmpbuf, 16);

  370.     if (mxf->aesc)

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

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

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

  374.     size -= 32;

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

  376.     if (size < 0)

  377.         return size;

  378.     else if (size < plaintext_size)

  379.         return AVERROR_INVALIDDATA;

  380.     size -= plaintext_size;

  381.     if (mxf->aesc)

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

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

  384.     av_shrink_packet(pkt, orig_size);

  385.     pkt->stream_index = index;

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

  387.     return 0;

  388. }

  389. 

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

  391. {

  392.     MXFContext *mxf = arg;

  393.     int item_num = avio_rb32(pb);

  394.     int item_len = avio_rb32(pb);

  395. 

  396.     if (item_len != 18) {

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

  398.         return AVERROR_PATCHWELCOME;

  399.     }

  400.     if (item_num > UINT_MAX / item_len)

  401.         return AVERROR_INVALIDDATA;

  402.     mxf->local_tags_count = item_num;

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

  404.     if (!mxf->local_tags)

  405.         return AVERROR(ENOMEM);

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

  407.     return 0;

  408. }

  409. 

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

  411. {

  412.     MXFContext *mxf = arg;

  413.     MXFPartition *partition;

  414.     UID op;

  415.     uint64_t footer_partition;

  416.     uint32_t nb_essence_containers;

  417.     int err;

  418. 

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

  420.         return AVERROR(ENOMEM);

  421. 

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

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

  424.         mxf->partitions_count = 0;

  425.         return err;

  426.     }

  427. 

  428.     if (mxf->parsing_backward) {

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

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

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

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

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

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

  435.     } else {

  436.         mxf->last_forward_partition++;

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

  438.     }

  439. 

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

  441.     mxf->partitions_count++;

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

  443. 

  444.     switch(uid[13]) {

  445.     case 2:

  446.         partition->type = Header;

  447.         break;

  448.     case 3:

  449.         partition->type = BodyPartition;

  450.         break;

  451.     case 4:

  452.         partition->type = Footer;

  453.         break;

  454.     default:

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

  456.         return AVERROR_INVALIDDATA;

  457.     }

  458. 

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

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

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

  462.     avio_skip(pb, 4);

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

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

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

  466.     footer_partition = avio_rb64(pb);

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

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

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

  470.     avio_skip(pb, 8);

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

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

  473.     nb_essence_containers = avio_rb32(pb);

  474. 

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

  476.     if (footer_partition) {

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

  478.             av_log(mxf->fc, AV_LOG_ERROR,

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

  480.                    mxf->footer_partition, footer_partition);

  481.         } else {

  482.             mxf->footer_partition = footer_partition;

  483.         }

  484.     }

  485. 

  486.     av_dlog(mxf->fc,

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

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

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

  490.             partition->this_partition,

  491.             partition->previous_partition, footer_partition,

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

  493. 

  494.     /* sanity check PreviousPartition if set */

  495.     if (partition->previous_partition &&

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

  497.         av_log(mxf->fc, AV_LOG_ERROR,

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

  499.         return AVERROR_INVALIDDATA;

  500.     }

  501. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  515.          * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a

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

  517.         if (nb_essence_containers != 1) {

  518.             MXFOP op = nb_essence_containers ? OP1a : OPAtom;

  519. 

  520.             /* only nag once */

  521.             if (!mxf->op)

  522.                 av_log(mxf->fc, AV_LOG_WARNING,

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

  524.                        nb_essence_containers,

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

  526. 

  527.             mxf->op = op;

  528.         } else

  529.             mxf->op = OPAtom;

  530.     } else {

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

  532.         mxf->op = OP1a;

  533.     }

  534. 

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

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

  537. 

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

  539.             partition->kag_size = 512;

  540.         else

  541.             partition->kag_size = 1;

  542. 

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

  544.     }

  545. 

  546.     return 0;

  547. }

  548. 

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

  550. {

  551.     int err;

  552. 

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

  554.         return AVERROR(ENOMEM);

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

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

  557.         mxf->metadata_sets_count = 0;

  558.         return err;

  559.     }

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

  561.     mxf->metadata_sets_count++;

  562.     return 0;

  563. }

  564. 

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

  566. {

  567.     MXFCryptoContext *cryptocontext = arg;

  568.     if (size != 16)

  569.         return AVERROR_INVALIDDATA;

  570.     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))

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

  572.     return 0;

  573. }

  574. 

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

  576. {

  577.     MXFContext *mxf = arg;

  578.     switch (tag) {

  579.     case 0x1901:

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

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

  582.             return AVERROR_INVALIDDATA;

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

  584.         if (!mxf->packages_refs)

  585.             return AVERROR(ENOMEM);

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

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

  588.         break;

  589.     }

  590.     return 0;

  591. }

  592. 

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

  594. {

  595.     MXFStructuralComponent *source_clip = arg;

  596.     switch(tag) {

  597.     case 0x0202:

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

  599.         break;

  600.     case 0x1201:

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

  602.         break;

  603.     case 0x1101:

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

  605.         avio_skip(pb, 16);

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

  607.         break;

  608.     case 0x1102:

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

  610.         break;

  611.     }

  612.     return 0;

  613. }

  614. 

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

  616. {

  617.     MXFPackage *package = arg;

  618.     switch(tag) {

  619.     case 0x4403:

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

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

  622.             return AVERROR_INVALIDDATA;

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

  624.         if (!package->tracks_refs)

  625.             return AVERROR(ENOMEM);

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

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

  628.         break;

  629.     }

  630.     return 0;

  631. }

  632. 

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

  634. {

  635.     MXFTrack *track = arg;

  636.     switch(tag) {

  637.     case 0x4801:

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

  639.         break;

  640.     case 0x4804:

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

  642.         break;

  643.     case 0x4B01:

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

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

  646.         break;

  647.     case 0x4803:

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

  649.         break;

  650.     }

  651.     return 0;

  652. }

  653. 

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

  655. {

  656.     MXFSequence *sequence = arg;

  657.     switch(tag) {

  658.     case 0x0202:

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

  660.         break;

  661.     case 0x0201:

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

  663.         break;

  664.     case 0x1001:

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

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

  667.             return AVERROR_INVALIDDATA;

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

  669.         if (!sequence->structural_components_refs)

  670.             return AVERROR(ENOMEM);

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

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

  673.         break;

  674.     }

  675.     return 0;

  676. }

  677. 

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

  679. {

  680.     MXFPackage *package = arg;

  681.     switch(tag) {

  682.     case 0x4403:

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

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

  685.             return AVERROR_INVALIDDATA;

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

  687.         if (!package->tracks_refs)

  688.             return AVERROR(ENOMEM);

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

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

  691.         break;

  692.     case 0x4401:

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

  694.         avio_skip(pb, 16);

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

  696.         break;

  697.     case 0x4701:

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

  699.         break;

  700.     }

  701.     return 0;

  702. }

  703. 

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

  705. {

  706.     int i, length;

  707. 

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

  709.     if (!segment->nb_index_entries)

  710.         return 0;

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

  712.              segment->nb_index_entries >

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

  714.         return AVERROR(ENOMEM);

  715. 

  716.     length = avio_rb32(pb);

  717. 

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

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

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

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

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

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

  724. 

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

  726.         !segment->temporal_offset_entries) {

  727.         av_freep(&segment->flag_entries);

  728.         av_freep(&segment->stream_offset_entries);

  729.         av_freep(&segment->temporal_offset_entries);

  730.         return AVERROR(ENOMEM);

  731.     }

  732. 

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

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

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

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

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

  738.         avio_skip(pb, length - 11);

  739.     }

  740.     return 0;

  741. }

  742. 

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

  744. {

  745.     MXFIndexTableSegment *segment = arg;

  746.     switch(tag) {

  747.     case 0x3F05:

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

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

  750.         break;

  751.     case 0x3F06:

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

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

  754.         break;

  755.     case 0x3F07:

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

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

  758.         break;

  759.     case 0x3F0A:

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

  761.         return mxf_read_index_entry_array(pb, segment);

  762.     case 0x3F0B:

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

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

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

  766.                 segment->index_edit_rate.den);

  767.         break;

  768.     case 0x3F0C:

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

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

  771.         break;

  772.     case 0x3F0D:

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

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

  775.         break;

  776.     }

  777.     return 0;

  778. }

  779. 

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

  781. {

  782.     int code, value, ofs = 0;

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

  784. 

  785.     do {

  786.         code = avio_r8(pb);

  787.         value = avio_r8(pb);

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

  789. 

  790.         if (ofs < 16) {

  791.             layout[ofs++] = code;

  792.             layout[ofs++] = value;

  793.         }

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

  795. 

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

  797. }

  798. 

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

  800. {

  801.     MXFDescriptor *descriptor = arg;

  802.     descriptor->pix_fmt = AV_PIX_FMT_NONE;

  803.     switch(tag) {

  804.     case 0x3F01:

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

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

  807.             return AVERROR_INVALIDDATA;

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

  809.         if (!descriptor->sub_descriptors_refs)

  810.             return AVERROR(ENOMEM);

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

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

  813.         break;

  814.     case 0x3004:

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

  816.         break;

  817.     case 0x3006:

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

  819.         break;

  820.     case 0x3201: /* PictureEssenceCoding */

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

  822.         break;

  823.     case 0x3203:

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

  825.         break;

  826.     case 0x3202:

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

  828.         break;

  829.     case 0x320C:

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

  831.         break;

  832.     case 0x320E:

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

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

  835.         break;

  836.     case 0x3301:

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

  838.         break;

  839.     case 0x3302:

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

  841.         break;

  842.     case 0x3308:

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

  844.         break;

  845.     case 0x3D03:

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

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

  848.         break;

  849.     case 0x3D06: /* SoundEssenceCompression */

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

  851.         break;

  852.     case 0x3D07:

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

  854.         break;

  855.     case 0x3D01:

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

  857.         break;

  858.     case 0x3401:

  859.         mxf_read_pixel_layout(pb, descriptor);

  860.         break;

  861.     default:

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

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

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

  865.             if (!descriptor->extradata)

  866.                 return AVERROR(ENOMEM);

  867.             descriptor->extradata_size = size;

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

  869.         }

  870.         break;

  871.     }

  872.     return 0;

  873. }

  874. 

  875. /*

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

  877.  * Returns: boolean

  878.  */

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

  880. {

  881.     int i;

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

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

  884.             return 0;

  885.     }

  886.     return 1;

  887. }

  888. 

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

  890. {

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

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

  893.             break;

  894.         uls++;

  895.     }

  896.     return uls;

  897. }

  898. 

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

  900. {

  901.     int i;

  902. 

  903.     if (!strong_ref)

  904.         return NULL;

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

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

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

  908.             return mxf->metadata_sets[i];

  909.         }

  910.     }

  911.     return NULL;

  912. }

  913. 

  914. static const MXFCodecUL mxf_picture_essence_container_uls[] = {

  915.     // video essence container uls

  916.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */

  917.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */

  918.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* Uncompressed Picture */

  919.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  920. };

  921. 

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

  923. static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {

  924.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 Mappings */

  925.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  926. };

  927. 

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

  929. static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {

  930.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */

  931.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */

  932.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },

  933. };

  934. 

  935. static const MXFCodecUL mxf_sound_essence_container_uls[] = {

  936.     // sound essence container uls

  937.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */

  938.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */

  939.     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */

  940.     { { 0x06,0x0E,0x2B,0x34,0x01,0x01,0x01,0xFF,0x4B,0x46,0x41,0x41,0x00,0x0D,0x4D,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */

  941.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },

  942. };

  943. 

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

  945. {

  946.     int i, j, nb_segments = 0;

  947.     MXFIndexTableSegment **unsorted_segments;

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

  949. 

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

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

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

  953.             nb_segments++;

  954. 

  955.     if (!nb_segments)

  956.         return AVERROR_INVALIDDATA;

  957. 

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

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

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

  961.         av_freep(sorted_segments);

  962.         av_free(unsorted_segments);

  963.         return AVERROR(ENOMEM);

  964.     }

  965. 

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

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

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

  969. 

  970.     *nb_sorted_segments = 0;

  971. 

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

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

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

  975. 

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

  977.             MXFIndexTableSegment *s = unsorted_segments[j];

  978. 

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

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

  981.              */

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

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

  984.                 best             = j;

  985.                 best_body_sid    = s->body_sid;

  986.                 best_index_sid   = s->index_sid;

  987.                 best_index_start = s->index_start_position;

  988.             }

  989.         }

  990. 

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

  992.         if (best == -1)

  993.             break;

  994. 

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

  996.         last_body_sid    = best_body_sid;

  997.         last_index_sid   = best_index_sid;

  998.         last_index_start = best_index_start;

  999.     }

  1000. 

  1001.     av_free(unsorted_segments);

  1002. 

  1003.     return 0;

  1004. }

  1005. 

  1006. /**

  1007.  * Computes the absolute file offset of the given essence container offset

  1008.  */

  1009. static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)

  1010. {

  1011.     int x;

  1012.     int64_t offset_in = offset;     /* for logging */

  1013. 

  1014.     for (x = 0; x < mxf->partitions_count; x++) {

  1015.         MXFPartition *p = &mxf->partitions[x];

  1016. 

  1017.         if (p->body_sid != body_sid)

  1018.             continue;

  1019. 

  1020.         if (offset < p->essence_length || !p->essence_length) {

  1021.             *offset_out = p->essence_offset + offset;

  1022.             return 0;

  1023.         }

  1024. 

  1025.         offset -= p->essence_length;

  1026.     }

  1027. 

  1028.     av_log(mxf->fc, AV_LOG_ERROR,

  1029.            "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",

  1030.            offset_in, body_sid);

  1031. 

  1032.     return AVERROR_INVALIDDATA;

  1033. }

  1034. 

  1035. /**

  1036.  * Returns the end position of the essence container with given BodySID, or zero if unknown

  1037.  */

  1038. static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)

  1039. {

  1040.     int x;

  1041.     int64_t ret = 0;

  1042. 

  1043.     for (x = 0; x < mxf->partitions_count; x++) {

  1044.         MXFPartition *p = &mxf->partitions[x];

  1045. 

  1046.         if (p->body_sid != body_sid)

  1047.             continue;

  1048. 

  1049.         if (!p->essence_length)

  1050.             return 0;

  1051. 

  1052.         ret = p->essence_offset + p->essence_length;

  1053.     }

  1054. 

  1055.     return ret;

  1056. }

  1057. 

  1058. /* EditUnit -> absolute offset */

  1059. static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, int64_t *edit_unit_out, int64_t *offset_out, int nag)

  1060. {

  1061.     int i;

  1062.     int64_t offset_temp = 0;

  1063. 

  1064.     for (i = 0; i < index_table->nb_segments; i++) {

  1065.         MXFIndexTableSegment *s = index_table->segments[i];

  1066. 

  1067.         edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

  1068. 

  1069.         if (edit_unit < s->index_start_position + s->index_duration) {

  1070.             int64_t index = edit_unit - s->index_start_position;

  1071. 

  1072.             if (s->edit_unit_byte_count)

  1073.                 offset_temp += s->edit_unit_byte_count * index;

  1074.             else if (s->nb_index_entries) {

  1075.                 if (s->nb_index_entries == 2 * s->index_duration + 1)

  1076.                     index *= 2;     /* Avid index */

  1077. 

  1078.                 if (index < 0 || index >= s->nb_index_entries) {

  1079.                     av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",

  1080.                            index_table->index_sid, s->index_start_position);

  1081.                     return AVERROR_INVALIDDATA;

  1082.                 }

  1083. 

  1084.                 offset_temp = s->stream_offset_entries[index];

  1085.             } else {

  1086.                 av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",

  1087.                        index_table->index_sid, s->index_start_position);

  1088.                 return AVERROR_INVALIDDATA;

  1089.             }

  1090. 

  1091.             if (edit_unit_out)

  1092.                 *edit_unit_out = edit_unit;

  1093. 

  1094.             return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);

  1095.         } else {

  1096.             /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */

  1097.             offset_temp += s->edit_unit_byte_count * s->index_duration;

  1098.         }

  1099.     }

  1100. 

  1101.     if (nag)

  1102.         av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);

  1103. 

  1104.     return AVERROR_INVALIDDATA;

  1105. }

  1106. 

  1107. static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)

  1108. {

  1109.     int i, j, x;

  1110.     int8_t max_temporal_offset = -128;

  1111. 

  1112.     /* first compute how many entries we have */

  1113.     for (i = 0; i < index_table->nb_segments; i++) {

  1114.         MXFIndexTableSegment *s = index_table->segments[i];

  1115. 

  1116.         if (!s->nb_index_entries) {

  1117.             index_table->nb_ptses = 0;

  1118.             return 0;                               /* no TemporalOffsets */

  1119.         }

  1120. 

  1121.         index_table->nb_ptses += s->index_duration;

  1122.     }

  1123. 

  1124.     /* paranoid check */

  1125.     if (index_table->nb_ptses <= 0)

  1126.         return 0;

  1127. 

  1128.     if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))

  1129.         return AVERROR(ENOMEM);

  1130. 

  1131.     index_table->ptses      = av_mallocz(index_table->nb_ptses *

  1132.                                          sizeof(int64_t));

  1133.     index_table->fake_index = av_mallocz(index_table->nb_ptses *

  1134.                                          sizeof(AVIndexEntry));

  1135.     if (!index_table->ptses || !index_table->fake_index) {

  1136.         av_freep(&index_table->ptses);

  1137.         return AVERROR(ENOMEM);

  1138.     }

  1139. 

  1140.     /* we may have a few bad TemporalOffsets

  1141.      * make sure the corresponding PTSes don't have the bogus value 0 */

  1142.     for (x = 0; x < index_table->nb_ptses; x++)

  1143.         index_table->ptses[x] = AV_NOPTS_VALUE;

  1144. 

  1145.     /**

  1146.      * We have this:

  1147.      *

  1148.      * x  TemporalOffset

  1149.      * 0:  0

  1150.      * 1:  1

  1151.      * 2:  1

  1152.      * 3: -2

  1153.      * 4:  1

  1154.      * 5:  1

  1155.      * 6: -2

  1156.      *

  1157.      * We want to transform it into this:

  1158.      *

  1159.      * x  DTS PTS

  1160.      * 0: -1   0

  1161.      * 1:  0   3

  1162.      * 2:  1   1

  1163.      * 3:  2   2

  1164.      * 4:  3   6

  1165.      * 5:  4   4

  1166.      * 6:  5   5

  1167.      *

  1168.      * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,

  1169.      * then settings mxf->first_dts = -max(TemporalOffset[x]).

  1170.      * The latter makes DTS <= PTS.

  1171.      */

  1172.     for (i = x = 0; i < index_table->nb_segments; i++) {

  1173.         MXFIndexTableSegment *s = index_table->segments[i];

  1174.         int index_delta = 1;

  1175.         int n = s->nb_index_entries;

  1176. 

  1177.         if (s->nb_index_entries == 2 * s->index_duration + 1) {

  1178.             index_delta = 2;    /* Avid index */

  1179.             /* ignore the last entry - it's the size of the essence container */

  1180.             n--;

  1181.         }

  1182. 

  1183.         for (j = 0; j < n; j += index_delta, x++) {

  1184.             int offset = s->temporal_offset_entries[j] / index_delta;

  1185.             int index  = x + offset;

  1186. 

  1187.             if (x >= index_table->nb_ptses) {

  1188.                 av_log(mxf->fc, AV_LOG_ERROR,

  1189.                        "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",

  1190.                        s->nb_index_entries, s->index_duration);

  1191.                 break;

  1192.             }

  1193. 

  1194.             index_table->fake_index[x].timestamp = x;

  1195.             index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

  1196. 

  1197.             if (index < 0 || index >= index_table->nb_ptses) {

  1198.                 av_log(mxf->fc, AV_LOG_ERROR,

  1199.                        "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",

  1200.                        x, offset, index);

  1201.                 continue;

  1202.             }

  1203. 

  1204.             index_table->ptses[index] = x;

  1205.             max_temporal_offset = FFMAX(max_temporal_offset, offset);

  1206.         }

  1207.     }

  1208. 

  1209.     index_table->first_dts = -max_temporal_offset;

  1210. 

  1211.     return 0;

  1212. }

  1213. 

  1214. /**

  1215.  * Sorts and collects index table segments into index tables.

  1216.  * Also computes PTSes if possible.

  1217.  */

  1218. static int mxf_compute_index_tables(MXFContext *mxf)

  1219. {

  1220.     int i, j, k, ret, nb_sorted_segments;

  1221.     MXFIndexTableSegment **sorted_segments = NULL;

  1222. 

  1223.     if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||

  1224.         nb_sorted_segments <= 0) {

  1225.         av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");

  1226.         return 0;

  1227.     }

  1228. 

  1229.     /* sanity check and count unique BodySIDs/IndexSIDs */

  1230.     for (i = 0; i < nb_sorted_segments; i++) {

  1231.         if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)

  1232.             mxf->nb_index_tables++;

  1233.         else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {

  1234.             av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");

  1235.             ret = AVERROR_INVALIDDATA;

  1236.             goto finish_decoding_index;

  1237.         }

  1238.     }

  1239. 

  1240.     if (mxf->nb_index_tables > INT_MAX / sizeof(MXFIndexTable) ||

  1241.         !(mxf->index_tables = av_mallocz(mxf->nb_index_tables *

  1242.                                          sizeof(MXFIndexTable)))) {

  1243.         av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");

  1244.         ret = AVERROR(ENOMEM);

  1245.         goto finish_decoding_index;

  1246.     }

  1247. 

  1248.     /* distribute sorted segments to index tables */

  1249.     for (i = j = 0; i < nb_sorted_segments; i++) {

  1250.         if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {

  1251.             /* next IndexSID */

  1252.             j++;

  1253.         }

  1254. 

  1255.         mxf->index_tables[j].nb_segments++;

  1256.     }

  1257. 

  1258.     for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {

  1259.         MXFIndexTable *t = &mxf->index_tables[j];

  1260. 

  1261.         if (t->nb_segments >

  1262.             (INT_MAX / sizeof(MXFIndexTableSegment *)) ||

  1263.             !(t->segments = av_mallocz(t->nb_segments *

  1264.                                        sizeof(MXFIndexTableSegment*)))) {

  1265.             av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"

  1266.                    " pointer array\n");

  1267.             ret = AVERROR(ENOMEM);

  1268.             goto finish_decoding_index;

  1269.         }

  1270. 

  1271.         if (sorted_segments[i]->index_start_position)

  1272.             av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",

  1273.                    sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

  1274. 

  1275.         memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));

  1276.         t->index_sid = sorted_segments[i]->index_sid;

  1277.         t->body_sid = sorted_segments[i]->body_sid;

  1278. 

  1279.         if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)

  1280.             goto finish_decoding_index;

  1281. 

  1282.         /* fix zero IndexDurations */

  1283.         for (k = 0; k < t->nb_segments; k++) {

  1284.             if (t->segments[k]->index_duration)

  1285.                 continue;

  1286. 

  1287.             if (t->nb_segments > 1)

  1288.                 av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",

  1289.                        t->index_sid, k);

  1290. 

  1291.             if (mxf->fc->nb_streams <= 0) {

  1292.                 av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");

  1293.                 break;

  1294.             }

  1295. 

  1296.             /* assume the first stream's duration is reasonable

  1297.              * leave index_duration = 0 on further segments in case we have any (unlikely)

  1298.              */

  1299.             t->segments[k]->index_duration = mxf->fc->streams[0]->duration;

  1300.             break;

  1301.         }

  1302.     }

  1303. 

  1304.     ret = 0;

  1305. finish_decoding_index:

  1306.     av_free(sorted_segments);

  1307.     return ret;

  1308. }

  1309. 

  1310. static int mxf_is_intra_only(MXFDescriptor *d)

  1311. {

  1312.     return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,

  1313.                             &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||

  1314.            mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,

  1315.                             &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;

  1316. }

  1317. 

  1318. static int mxf_parse_structural_metadata(MXFContext *mxf)

  1319. {

  1320.     MXFPackage *material_package = NULL;

  1321.     MXFPackage *temp_package = NULL;

  1322.     int i, j, k, ret;

  1323. 

  1324.     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);

  1325.     /* TODO: handle multiple material packages (OP3x) */

  1326.     for (i = 0; i < mxf->packages_count; i++) {

  1327.         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);

  1328.         if (material_package) break;

  1329.     }

  1330.     if (!material_package) {

  1331.         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");

  1332.         return AVERROR_INVALIDDATA;

  1333.     }

  1334. 

  1335.     for (i = 0; i < material_package->tracks_count; i++) {

  1336.         MXFPackage *source_package = NULL;

  1337.         MXFTrack *material_track = NULL;

  1338.         MXFTrack *source_track = NULL;

  1339.         MXFTrack *temp_track = NULL;

  1340.         MXFDescriptor *descriptor = NULL;

  1341.         MXFStructuralComponent *component = NULL;

  1342.         UID *essence_container_ul = NULL;

  1343.         const MXFCodecUL *codec_ul = NULL;

  1344.         const MXFCodecUL *container_ul = NULL;

  1345.         const MXFCodecUL *pix_fmt_ul = NULL;

  1346.         AVStream *st;

  1347. 

  1348.         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {

  1349.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");

  1350.             continue;

  1351.         }

  1352. 

  1353.         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {

  1354.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");

  1355.             continue;

  1356.         }

  1357. 

  1358.         /* TODO: handle multiple source clips */

  1359.         for (j = 0; j < material_track->sequence->structural_components_count; j++) {

  1360.             /* TODO: handle timecode component */

  1361.             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);

  1362.             if (!component)

  1363.                 continue;

  1364. 

  1365.             for (k = 0; k < mxf->packages_count; k++) {

  1366.                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);

  1367.                 if (!temp_package)

  1368.                     continue;

  1369.                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {

  1370.                     source_package = temp_package;

  1371.                     break;

  1372.                 }

  1373.             }

  1374.             if (!source_package) {

  1375.                 av_dlog(mxf->fc, "material track %d: no corresponding source package found\n", material_track->track_id);

  1376.                 break;

  1377.             }

  1378.             for (k = 0; k < source_package->tracks_count; k++) {

  1379.                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {

  1380.                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");

  1381.                     ret = AVERROR_INVALIDDATA;

  1382.                     goto fail_and_free;

  1383.                 }

  1384.                 if (temp_track->track_id == component->source_track_id) {

  1385.                     source_track = temp_track;

  1386.                     break;

  1387.                 }

  1388.             }

  1389.             if (!source_track) {

  1390.                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);

  1391.                 break;

  1392.             }

  1393.         }

  1394.         if (!source_track || !component)

  1395.             continue;

  1396. 

  1397.         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {

  1398.             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");

  1399.             ret = AVERROR_INVALIDDATA;

  1400.             goto fail_and_free;

  1401.         }

  1402. 

  1403.         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf

  1404.          * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */

  1405.         if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {

  1406.             av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);

  1407.             continue;

  1408.         }

  1409. 

  1410.         st = avformat_new_stream(mxf->fc, NULL);

  1411.         if (!st) {

  1412.             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");

  1413.             ret = AVERROR(ENOMEM);

  1414.             goto fail_and_free;

  1415.         }

  1416.         st->id = source_track->track_id;

  1417.         st->priv_data = source_track;

  1418.         st->duration = component->duration;

  1419.         if (st->duration == -1)

  1420.             st->duration = AV_NOPTS_VALUE;

  1421.         st->start_time = component->start_position;

  1422.         avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);

  1423. 

  1424.         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

  1425.         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

  1426.         st->codec->codec_type = codec_ul->id;

  1427. 

  1428.         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

  1429.         if (source_package->descriptor) {

  1430.             if (source_package->descriptor->type == MultipleDescriptor) {

  1431.                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {

  1432.                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);

  1433. 

  1434.                     if (!sub_descriptor) {

  1435.                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");

  1436.                         continue;

  1437.                     }

  1438.                     if (sub_descriptor->linked_track_id == source_track->track_id) {

  1439.                         descriptor = sub_descriptor;

  1440.                         break;

  1441.                     }

  1442.                 }

  1443.             } else if (source_package->descriptor->type == Descriptor)

  1444.                 descriptor = source_package->descriptor;

  1445.         }

  1446.         if (!descriptor) {

  1447.             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

  1448.             continue;

  1449.         }

  1450.         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

  1451.         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

  1452.         essence_container_ul = &descriptor->essence_container_ul;

  1453.         /* HACK: replacing the original key with mxf_encrypted_essence_container

  1454.          * is not allowed according to s429-6, try to find correct information anyway */

  1455.         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {

  1456.             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");

  1457.             for (k = 0; k < mxf->metadata_sets_count; k++) {

  1458.                 MXFMetadataSet *metadata = mxf->metadata_sets[k];

  1459.                 if (metadata->type == CryptoContext) {

  1460.                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;

  1461.                     break;

  1462.                 }

  1463.             }

  1464.         }

  1465. 

  1466.         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */

  1467.         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);

  1468.         st->codec->codec_id = codec_ul->id;

  1469.         if (descriptor->extradata) {

  1470.             st->codec->extradata = descriptor->extradata;

  1471.             st->codec->extradata_size = descriptor->extradata_size;

  1472.         }

  1473.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  1474.             source_track->intra_only = mxf_is_intra_only(descriptor);

  1475.             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);

  1476.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1477.                 st->codec->codec_id = container_ul->id;

  1478.             st->codec->width = descriptor->width;

  1479.             /* Field height, not frame height */

  1480.             st->codec->height = descriptor->height;

  1481.             switch (descriptor->frame_layout) {

  1482.                 case SegmentedFrame:

  1483.                     /* This one is a weird layout I don't fully understand. */

  1484.                     av_log(mxf->fc, AV_LOG_INFO,

  1485.                            "SegmentedFrame layout isn't currently supported\n");

  1486.                     break;

  1487.                 case FullFrame:

  1488.                     break;

  1489.                 case OneField:

  1490.                     /* Every other line is stored and needs to be duplicated. */

  1491.                     av_log(mxf->fc, AV_LOG_INFO,

  1492.                            "OneField frame layout isn't currently supported\n");

  1493.                     break;

  1494.                     /* The correct thing to do here is fall through, but by

  1495.                      * breaking we might be able to decode some streams at half

  1496.                      * the vertical resolution, rather than not al all.

  1497.                      * It's also for compatibility with the old behavior. */

  1498.                 case SeparateFields:

  1499.                 case MixedFields:

  1500.                     /* Turn field height into frame height. */

  1501.                     st->codec->height *= 2;

  1502.                 default:

  1503.                     av_log(mxf->fc, AV_LOG_INFO,

  1504.                            "Unknown frame layout type: %d\n",

  1505.                            descriptor->frame_layout);

  1506.             }

  1507.             if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {

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

  1509.                 if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1510.                     pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,

  1511.                                                   &descriptor->essence_codec_ul);

  1512.                     st->codec->pix_fmt = pix_fmt_ul->id;

  1513.                     if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {

  1514.                         /* support files created before RP224v10 by defaulting to UYVY422

  1515.                            if subsampling is 4:2:2 and component depth is 8-bit */

  1516.                         if (descriptor->horiz_subsampling == 2 &&

  1517.                             descriptor->vert_subsampling == 1 &&

  1518.                             descriptor->component_depth == 8) {

  1519.                             st->codec->pix_fmt = AV_PIX_FMT_UYVY422;

  1520.                         }

  1521.                     }

  1522.                 }

  1523.             }

  1524.             st->need_parsing = AVSTREAM_PARSE_HEADERS;

  1525.         } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  1526.             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);

  1527.             if (st->codec->codec_id == AV_CODEC_ID_NONE)

  1528.                 st->codec->codec_id = container_ul->id;

  1529.             st->codec->channels = descriptor->channels;

  1530.             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;

  1531. 

  1532.             if (descriptor->sample_rate.den > 0) {

  1533.                 st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;

  1534.                 avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);

  1535.             } else {

  1536.                 av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "

  1537.                        "found for stream #%d, time base forced to 1/48000\n",

  1538.                        descriptor->sample_rate.num, descriptor->sample_rate.den,

  1539.                        st->index);

  1540.                 avpriv_set_pts_info(st, 64, 1, 48000);

  1541.             }

  1542. 

  1543.             /* TODO: implement AV_CODEC_ID_RAWAUDIO */

  1544.             if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {

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

  1546.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;

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

  1548.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;

  1549.             } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {

  1550.                 if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)

  1551.                     st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;

  1552.                 else if (descriptor->bits_per_sample == 32)

  1553.                     st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

  1554.             } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {

  1555.                 st->need_parsing = AVSTREAM_PARSE_FULL;

  1556.             }

  1557.         }

  1558.         if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {

  1559.             /* TODO: decode timestamps */

  1560.             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

  1561.         }

  1562.     }

  1563. 

  1564.     ret = 0;

  1565. fail_and_free:

  1566.     return ret;

  1567. }

  1568. 

  1569. static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {

  1570.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },

  1571.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },

  1572.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },

  1573.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },

  1574.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },

  1575.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },

  1576.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },

  1577.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },

  1578.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },

  1579.     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },

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

  1581.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },

  1582.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },

  1583.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },

  1584.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },

  1585.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },

  1586.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },

  1587.     { { 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 */

  1588.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */

  1589.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */

  1590.     { { 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 */

  1591.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */

  1592.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */

  1593.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */

  1594.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */

  1595.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },

  1596.     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },

  1597.     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },

  1598. };

  1599. 

  1600. static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)

  1601. {

  1602.     AVIOContext *pb = mxf->fc->pb;

  1603.     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;

  1604.     uint64_t klv_end = avio_tell(pb) + klv->length;

  1605. 

  1606.     if (!ctx)

  1607.         return AVERROR(ENOMEM);

  1608.     while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {

  1609.         int ret;

  1610.         int tag = avio_rb16(pb);

  1611.         int size = avio_rb16(pb); /* KLV specified by 0x53 */

  1612.         uint64_t next = avio_tell(pb) + size;

  1613.         UID uid = {0};

  1614. 

  1615.         av_dlog(mxf->fc, "local tag %#04x size %d\n", tag, size);

  1616.         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */

  1617.             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);

  1618.             continue;

  1619.         }

  1620.         if (tag > 0x7FFF) { /* dynamic tag */

  1621.             int i;

  1622.             for (i = 0; i < mxf->local_tags_count; i++) {

  1623.                 int local_tag = AV_RB16(mxf->local_tags+i*18);

  1624.                 if (local_tag == tag) {

  1625.                     memcpy(uid, mxf->local_tags+i*18+2, 16);

  1626.                     av_dlog(mxf->fc, "local tag %#04x\n", local_tag);

  1627.                     PRINT_KEY(mxf->fc, "uid", uid);

  1628.                 }

  1629.             }

  1630.         }

  1631.         if (ctx_size && tag == 0x3C0A)

  1632.             avio_read(pb, ctx->uid, 16);

  1633.         else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)

  1634.             return ret;

  1635. 

  1636.         /* Accept the 64k local set limit being exceeded (Avid). Don't accept

  1637.          * it extending past the end of the KLV though (zzuf5.mxf). */

  1638.         if (avio_tell(pb) > klv_end) {

  1639.             av_log(mxf->fc, AV_LOG_ERROR,

  1640.                    "local tag %#04x extends past end of local set @ %#"PRIx64"\n",

  1641.                    tag, klv->offset);

  1642.             return AVERROR_INVALIDDATA;

  1643.         } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */

  1644.             avio_seek(pb, next, SEEK_SET);

  1645.     }

  1646.     if (ctx_size) ctx->type = type;

  1647.     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;

  1648. }

  1649. 

  1650. /**

  1651.  * Seeks to the previous partition, if possible

  1652.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1653.  */

  1654. static int mxf_seek_to_previous_partition(MXFContext *mxf)

  1655. {

  1656.     AVIOContext *pb = mxf->fc->pb;

  1657. 

  1658.     if (!mxf->current_partition ||

  1659.         mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)

  1660.         return 0;   /* we've parsed all partitions */

  1661. 

  1662.     /* seek to previous partition */

  1663.     avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);

  1664.     mxf->current_partition = NULL;

  1665. 

  1666.     av_dlog(mxf->fc, "seeking to previous partition\n");

  1667. 

  1668.     return 1;

  1669. }

  1670. 

  1671. /**

  1672.  * Called when essence is encountered

  1673.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1674.  */

  1675. static int mxf_parse_handle_essence(MXFContext *mxf)

  1676. {

  1677.     AVIOContext *pb = mxf->fc->pb;

  1678.     int64_t ret;

  1679. 

  1680.     if (mxf->parsing_backward) {

  1681.         return mxf_seek_to_previous_partition(mxf);

  1682.     } else {

  1683.         if (!mxf->footer_partition) {

  1684.             av_dlog(mxf->fc, "no footer\n");

  1685.             return 0;

  1686.         }

  1687. 

  1688.         av_dlog(mxf->fc, "seeking to footer\n");

  1689. 

  1690.         /* remember where we were so we don't end up seeking further back than this */

  1691.         mxf->last_forward_tell = avio_tell(pb);

  1692. 

  1693.         if (!pb->seekable) {

  1694.             av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing footer\n");

  1695.             return -1;

  1696.         }

  1697. 

  1698.         /* seek to footer partition and parse backward */

  1699.         if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {

  1700.             av_log(mxf->fc, AV_LOG_ERROR, "failed to seek to footer @ 0x%"PRIx64" (%"PRId64") - partial file?\n",

  1701.                    mxf->run_in + mxf->footer_partition, ret);

  1702.             return ret;

  1703.         }

  1704. 

  1705.         mxf->current_partition = NULL;

  1706.         mxf->parsing_backward = 1;

  1707.     }

  1708. 

  1709.     return 1;

  1710. }

  1711. 

  1712. /**

  1713.  * Called when the next partition or EOF is encountered

  1714.  * @return <= 0 if we should stop parsing, > 0 if we should keep going

  1715.  */

  1716. static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)

  1717. {

  1718.     return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;

  1719. }

  1720. 

  1721. /**

  1722.  * Figure out the proper offset and length of the essence container

  1723.  * in each partition

  1724.  */

  1725. static void mxf_compute_essence_containers(MXFContext *mxf)

  1726. {

  1727.     int x;

  1728. 

  1729.     /* everything is already correct */

  1730.     if (mxf->op == OPAtom)

  1731.         return;

  1732. 

  1733.     for (x = 0; x < mxf->partitions_count; x++) {

  1734.         MXFPartition *p = &mxf->partitions[x];

  1735. 

  1736.         if (!p->body_sid)

  1737.             continue;       /* BodySID == 0 -> no essence */

  1738. 

  1739.         if (x >= mxf->partitions_count - 1)

  1740.             break;          /* last partition - can't compute length (and we don't need to) */

  1741. 

  1742.         /* essence container spans to the next partition */

  1743.         p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

  1744. 

  1745.         if (p->essence_length < 0) {

  1746.             /* next ThisPartition < essence_offset */

  1747.             p->essence_length = 0;

  1748.             av_log(mxf->fc, AV_LOG_ERROR,

  1749.                    "partition %i: bad ThisPartition = %"PRIX64"\n",

  1750.                    x+1, mxf->partitions[x+1].this_partition);

  1751.         }

  1752.     }

  1753. }

  1754. 

  1755. static int64_t round_to_kag(int64_t position, int kag_size)

  1756. {

  1757.     /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */

  1758.     /* NOTE: kag_size may be any integer between 1 - 2^10 */

  1759.     int64_t ret = (position / kag_size) * kag_size;

  1760.     return ret == position ? ret : ret + kag_size;

  1761. }

  1762. 

  1763. static inline void compute_partition_essence_offset(AVFormatContext *s,

  1764.                                                     MXFContext *mxf,

  1765.                                                     KLVPacket *klv)

  1766. {

  1767.     MXFPartition *cur_part = mxf->current_partition;

  1768.     /* for OP1a we compute essence_offset

  1769.      * for OPAtom we point essence_offset after the KL

  1770.      *     (usually op1a_essence_offset + 20 or 25)

  1771.      * TODO: for OP1a we could eliminate this entire if statement, always

  1772.      *       stopping parsing at op1a_essence_offset

  1773.      *       for OPAtom we still need the actual essence_offset though

  1774.      *       (the KL's length can vary)

  1775.      */

  1776.     int64_t op1a_essence_offset =

  1777.         round_to_kag(cur_part->this_partition + cur_part->pack_length,

  1778.                      cur_part->kag_size) +

  1779.         round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +

  1780.         round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

  1781. 

  1782.     if (mxf->op == OPAtom) {

  1783.         /* point essence_offset to the actual data

  1784.          * OPAtom has all the essence in one big KLV

  1785.          */

  1786.         cur_part->essence_offset = avio_tell(s->pb);

  1787.         cur_part->essence_length = klv->length;

  1788.     } else {

  1789.         /* NOTE: op1a_essence_offset may be less than to klv.offset

  1790.          * (C0023S01.mxf)  */

  1791.         cur_part->essence_offset = op1a_essence_offset;

  1792.     }

  1793. }

  1794. 

  1795. static int is_pcm(enum AVCodecID codec_id)

  1796. {

  1797.     /* we only care about "normal" PCM codecs until we get samples */

  1798.     return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;

  1799. }

  1800. 

  1801. /**

  1802.  * Deal with the case where for some audio atoms EditUnitByteCount is

  1803.  * very small (2, 4..). In those cases we should read more than one

  1804.  * sample per call to mxf_read_packet().

  1805.  */

  1806. static void mxf_handle_small_eubc(AVFormatContext *s)

  1807. {

  1808.     MXFContext *mxf = s->priv_data;

  1809. 

  1810.     /* assuming non-OPAtom == frame wrapped

  1811.      * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */

  1812.     if (mxf->op != OPAtom)

  1813.         return;

  1814. 

  1815.     /* expect PCM with exactly one index table segment and a small (< 32) EUBC */

  1816.     if (s->nb_streams != 1                                     ||

  1817.         s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||

  1818.         !is_pcm(s->streams[0]->codec->codec_id)                ||

  1819.         mxf->nb_index_tables != 1                              ||

  1820.         mxf->index_tables[0].nb_segments != 1                  ||

  1821.         mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)

  1822.         return;

  1823. 

  1824.     /* arbitrarily default to 48 kHz PAL audio frame size */

  1825.     /* TODO: We could compute this from the ratio between the audio

  1826.      *       and video edit rates for 48 kHz NTSC we could use the

  1827.      *       1802-1802-1802-1802-1801 pattern. */

  1828.     mxf->edit_units_per_packet = 1920;

  1829. }

  1830. 

  1831. static int mxf_read_header(AVFormatContext *s)

  1832. {

  1833.     MXFContext *mxf = s->priv_data;

  1834.     KLVPacket klv;

  1835.     int64_t essence_offset = 0;

  1836.     int ret;

  1837. 

  1838.     mxf->last_forward_tell = INT64_MAX;

  1839.     mxf->edit_units_per_packet = 1;

  1840. 

  1841.     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {

  1842.         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");

  1843.         return AVERROR_INVALIDDATA;

  1844.     }

  1845.     avio_seek(s->pb, -14, SEEK_CUR);

  1846.     mxf->fc = s;

  1847.     mxf->run_in = avio_tell(s->pb);

  1848. 

  1849.     while (!s->pb->eof_reached) {

  1850.         const MXFMetadataReadTableEntry *metadata;

  1851. 

  1852.         if (klv_read_packet(&klv, s->pb) < 0) {

  1853.             /* EOF - seek to previous partition or stop */

  1854.             if(mxf_parse_handle_partition_or_eof(mxf) <= 0)

  1855.                 break;

  1856.             else

  1857.                 continue;

  1858.         }

  1859. 

  1860.         PRINT_KEY(s, "read header", klv.key);

  1861.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  1862.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

  1863.             IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  1864.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||

  1865.             IS_KLV_KEY(klv.key, mxf_system_item_key)) {

  1866. 

  1867.             if (!mxf->current_partition) {

  1868.                 av_log(mxf->fc, AV_LOG_ERROR,

  1869.                        "found essence prior to first PartitionPack\n");

  1870.                 return AVERROR_INVALIDDATA;

  1871.             }

  1872. 

  1873.             if (!mxf->current_partition->essence_offset) {

  1874.                 compute_partition_essence_offset(s, mxf, &klv);

  1875.             }

  1876. 

  1877.             if (!essence_offset)

  1878.                 essence_offset = klv.offset;

  1879. 

  1880.             /* seek to footer, previous partition or stop */

  1881.             if (mxf_parse_handle_essence(mxf) <= 0)

  1882.                 break;

  1883.             continue;

  1884.         } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&

  1885.                    klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {

  1886.             /* next partition pack - keep going, seek to previous partition or stop */

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

  1888.                 break;

  1889.             else if (mxf->parsing_backward)

  1890.                 continue;

  1891.             /* we're still parsing forward. proceed to parsing this partition pack */

  1892.         }

  1893. 

  1894.         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {

  1895.             if (IS_KLV_KEY(klv.key, metadata->key)) {

  1896.                 int res;

  1897.                 if (klv.key[5] == 0x53) {

  1898.                     res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);

  1899.                 } else {

  1900.                     uint64_t next = avio_tell(s->pb) + klv.length;

  1901.                     res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

  1902. 

  1903.                     /* only seek forward, else this can loop for a long time */

  1904.                     if (avio_tell(s->pb) > next) {

  1905.                         av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",

  1906.                                klv.offset);

  1907.                         return AVERROR_INVALIDDATA;

  1908.                     }

  1909. 

  1910.                     avio_seek(s->pb, next, SEEK_SET);

  1911.                 }

  1912.                 if (res < 0) {

  1913.                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");

  1914.                     return res;

  1915.                 }

  1916.                 break;

  1917.             }

  1918.         }

  1919.         if (!metadata->read)

  1920.             avio_skip(s->pb, klv.length);

  1921.     }

  1922.     /* FIXME avoid seek */

  1923.     if (!essence_offset)  {

  1924.         av_log(s, AV_LOG_ERROR, "no essence\n");

  1925.         return AVERROR_INVALIDDATA;

  1926.     }

  1927.     avio_seek(s->pb, essence_offset, SEEK_SET);

  1928. 

  1929.     mxf_compute_essence_containers(mxf);

  1930. 

  1931.     /* we need to do this before computing the index tables

  1932.      * to be able to fill in zero IndexDurations with st->duration */

  1933.     if ((ret = mxf_parse_structural_metadata(mxf)) < 0)

  1934.         return ret;

  1935. 

  1936.     if ((ret = mxf_compute_index_tables(mxf)) < 0)

  1937.         return ret;

  1938. 

  1939.     if (mxf->nb_index_tables > 1) {

  1940.         /* TODO: look up which IndexSID to use via EssenceContainerData */

  1941.         av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",

  1942.                mxf->nb_index_tables, mxf->index_tables[0].index_sid);

  1943.     } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {

  1944.         av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");

  1945.         return AVERROR_INVALIDDATA;

  1946.     }

  1947. 

  1948.     mxf_handle_small_eubc(s);

  1949. 

  1950.     return 0;

  1951. }

  1952. 

  1953. /**

  1954.  * Sets mxf->current_edit_unit based on what offset we're currently at.

  1955.  * @return next_ofs if OK, <0 on error

  1956.  */

  1957. static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)

  1958. {

  1959.     int64_t last_ofs = -1, next_ofs = -1;

  1960.     MXFIndexTable *t = &mxf->index_tables[0];

  1961. 

  1962.     /* this is called from the OP1a demuxing logic, which means there

  1963.      * may be no index tables */

  1964.     if (mxf->nb_index_tables <= 0)

  1965.         return -1;

  1966. 

  1967.     /* find mxf->current_edit_unit so that the next edit unit starts ahead

  1968.      * of current_offset */

  1969.     while (mxf->current_edit_unit >= 0) {

  1970.         if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,

  1971.                                           NULL, &next_ofs, 0) < 0)

  1972.             return -1;

  1973. 

  1974.         if (next_ofs <= last_ofs) {

  1975.             /* large next_ofs didn't change or current_edit_unit wrapped

  1976.              * around this fixes the infinite loop on zzuf3.mxf */

  1977.             av_log(mxf->fc, AV_LOG_ERROR,

  1978.                    "next_ofs didn't change. not deriving packet timestamps\n");

  1979.             return -1;

  1980.         }

  1981. 

  1982.         if (next_ofs > current_offset)

  1983.             break;

  1984. 

  1985.         last_ofs = next_ofs;

  1986.         mxf->current_edit_unit++;

  1987.     }

  1988. 

  1989.     /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files

  1990.      * may lack IndexEntryArrays */

  1991.     if (mxf->current_edit_unit < 0)

  1992.         return -1;

  1993. 

  1994.     return next_ofs;

  1995. }

  1996. 

  1997. static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)

  1998. {

  1999.     KLVPacket klv;

  2000.     MXFContext *mxf = s->priv_data;

  2001. 

  2002.     while (!s->pb->eof_reached) {

  2003.         if (klv_read_packet(&klv, s->pb) < 0)

  2004.             return -1;

  2005.         PRINT_KEY(s, "read packet", klv.key);

  2006.         av_dlog(s, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);

  2007.         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

  2008.             int res = mxf_decrypt_triplet(s, pkt, &klv);

  2009.             if (res < 0) {

  2010.                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");

  2011.                 return -1;

  2012.             }

  2013.             return 0;

  2014.         }

  2015.         if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||

  2016.             IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {

  2017.             int index = mxf_get_stream_index(s, &klv);

  2018.             int64_t next_ofs, next_klv;

  2019.             AVStream *st;

  2020.             MXFTrack *track;

  2021. 

  2022.             if (index < 0) {

  2023.                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));

  2024.                 goto skip;

  2025.             }

  2026. 

  2027.             st = s->streams[index];

  2028.             track = st->priv_data;

  2029. 

  2030.             if (s->streams[index]->discard == AVDISCARD_ALL)

  2031.                 goto skip;

  2032. 

  2033.             next_klv = avio_tell(s->pb) + klv.length;

  2034.             next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

  2035. 

  2036.             if (next_ofs >= 0 && next_klv > next_ofs) {

  2037.                 /* if this check is hit then it's possible OPAtom was treated

  2038.                  * as OP1a truncate the packet since it's probably very large

  2039.                  * (>2 GiB is common) */

  2040.                 avpriv_request_sample(s,

  2041.                                       "OPAtom misinterpreted as OP1a?"

  2042.                                       "KLV for edit unit %i extending into "

  2043.                                       "next edit unit",

  2044.                                       mxf->current_edit_unit);

  2045.                 klv.length = next_ofs - avio_tell(s->pb);

  2046.             }

  2047. 

  2048.             /* check for 8 channels AES3 element */

  2049.             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {

  2050.                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {

  2051.                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");

  2052.                     return -1;

  2053.                 }

  2054.             } else {

  2055.                 int ret = av_get_packet(s->pb, pkt, klv.length);

  2056.                 if (ret < 0)

  2057.                     return ret;

  2058.             }

  2059.             pkt->stream_index = index;

  2060.             pkt->pos = klv.offset;

  2061. 

  2062.             if (s->streams[index]->codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {

  2063.                 /* mxf->current_edit_unit good - see if we have an

  2064.                  * index table to derive timestamps from */

  2065.                 MXFIndexTable *t = &mxf->index_tables[0];

  2066. 

  2067.                 if (mxf->nb_index_tables >= 1 &&

  2068.                     mxf->current_edit_unit < t->nb_ptses) {

  2069.                     pkt->dts = mxf->current_edit_unit + t->first_dts;

  2070.                     pkt->pts = t->ptses[mxf->current_edit_unit];

  2071.                 } else if (track->intra_only) {

  2072.                     /* intra-only -> PTS = EditUnit.

  2073.                      * let utils.c figure out DTS since it can be

  2074.                      * < PTS if low_delay = 0 (Sony IMX30) */

  2075.                     pkt->pts = mxf->current_edit_unit;

  2076.                 }

  2077.             }

  2078. 

  2079.             /* seek for truncated packets */

  2080.             avio_seek(s->pb, next_klv, SEEK_SET);

  2081. 

  2082.             return 0;

  2083.         } else

  2084.         skip:

  2085.             avio_skip(s->pb, klv.length);

  2086.     }

  2087.     return AVERROR_EOF;

  2088. }

  2089. 

  2090. static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)

  2091. {

  2092.     MXFContext *mxf = s->priv_data;

  2093.     int ret, size;

  2094.     int64_t ret64, pos, next_pos;

  2095.     AVStream *st;

  2096.     MXFIndexTable *t;

  2097.     int edit_units;

  2098. 

  2099.     if (mxf->op != OPAtom)

  2100.         return mxf_read_packet_old(s, pkt);

  2101. 

  2102.     /* OPAtom - clip wrapped demuxing */

  2103.     /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */

  2104.     st = s->streams[0];

  2105.     t = &mxf->index_tables[0];

  2106. 

  2107.     if (mxf->current_edit_unit >= st->duration)

  2108.         return AVERROR_EOF;

  2109. 

  2110.     edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

  2111. 

  2112.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)

  2113.         return ret;

  2114. 

  2115.     /* compute size by finding the next edit unit or the end of the essence container

  2116.      * not pretty, but it works */

  2117.     if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&

  2118.         (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {

  2119.         av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");

  2120.         return AVERROR_INVALIDDATA;

  2121.     }

  2122. 

  2123.     if ((size = next_pos - pos) <= 0) {

  2124.         av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);

  2125.         return AVERROR_INVALIDDATA;

  2126.     }

  2127. 

  2128.     if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)

  2129.         return ret64;

  2130. 

  2131.         if ((ret = av_get_packet(s->pb, pkt, size)) != size)

  2132.             return ret < 0 ? ret : AVERROR_EOF;

  2133. 

  2134.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&

  2135.         mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {

  2136.         pkt->dts = mxf->current_edit_unit + t->first_dts;

  2137.         pkt->pts = t->ptses[mxf->current_edit_unit];

  2138.     }

  2139. 

  2140.     pkt->stream_index = 0;

  2141.     mxf->current_edit_unit += edit_units;

  2142. 

  2143.     return 0;

  2144. }

  2145. 

  2146. 

  2147. static int mxf_read_close(AVFormatContext *s)

  2148. {

  2149.     MXFContext *mxf = s->priv_data;

  2150.     MXFIndexTableSegment *seg;

  2151.     int i;

  2152. 

  2153.     av_freep(&mxf->packages_refs);

  2154. 

  2155.     for (i = 0; i < s->nb_streams; i++)

  2156.         s->streams[i]->priv_data = NULL;

  2157. 

  2158.     for (i = 0; i < mxf->metadata_sets_count; i++) {

  2159.         switch (mxf->metadata_sets[i]->type) {

  2160.         case MultipleDescriptor:

  2161.             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);

  2162.             break;

  2163.         case Sequence:

  2164.             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);

  2165.             break;

  2166.         case SourcePackage:

  2167.         case MaterialPackage:

  2168.             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);

  2169.             break;

  2170.         case IndexTableSegment:

  2171.             seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];

  2172.             av_freep(&seg->temporal_offset_entries);

  2173.             av_freep(&seg->flag_entries);

  2174.             av_freep(&seg->stream_offset_entries);

  2175.             break;

  2176.         default:

  2177.             break;

  2178.         }

  2179.         av_freep(&mxf->metadata_sets[i]);

  2180.     }

  2181.     av_freep(&mxf->partitions);

  2182.     av_freep(&mxf->metadata_sets);

  2183.     av_freep(&mxf->aesc);

  2184.     av_freep(&mxf->local_tags);

  2185. 

  2186.     for (i = 0; i < mxf->nb_index_tables; i++) {

  2187.         av_freep(&mxf->index_tables[i].segments);

  2188.         av_freep(&mxf->index_tables[i].ptses);

  2189.         av_freep(&mxf->index_tables[i].fake_index);

  2190.     }

  2191.     av_freep(&mxf->index_tables);

  2192. 

  2193.     return 0;

  2194. }

  2195. 

  2196. static int mxf_probe(AVProbeData *p) {

  2197.     uint8_t *bufp = p->buf;

  2198.     uint8_t *end = p->buf + p->buf_size;

  2199. 

  2200.     if (p->buf_size < sizeof(mxf_header_partition_pack_key))

  2201.         return 0;

  2202. 

  2203.     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */

  2204.     end -= sizeof(mxf_header_partition_pack_key);

  2205.     for (; bufp < end; bufp++) {

  2206.         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))

  2207.             return AVPROBE_SCORE_MAX;

  2208.     }

  2209.     return 0;

  2210. }

  2211. 

  2212. /* rudimentary byte seek */

  2213. /* XXX: use MXF Index */

  2214. static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

  2215. {

  2216.     AVStream *st = s->streams[stream_index];

  2217.     int64_t seconds;

  2218.     MXFContext* mxf = s->priv_data;

  2219.     int64_t seekpos;

  2220.     int ret;

  2221.     MXFIndexTable *t;

  2222. 

  2223.     if (mxf->nb_index_tables <= 0) {

  2224.     if (!s->bit_rate)

  2225.         return AVERROR_INVALIDDATA;

  2226.     if (sample_time < 0)

  2227.         sample_time = 0;

  2228.     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);

  2229. 

  2230.     if ((ret = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET)) < 0)

  2231.         return ret;

  2232.     ff_update_cur_dts(s, st, sample_time);

  2233.     } else {

  2234.         t = &mxf->index_tables[0];

  2235. 

  2236.         /* clamp above zero, else ff_index_search_timestamp() returns negative

  2237.          * this also means we allow seeking before the start */

  2238.         sample_time = FFMAX(sample_time, 0);

  2239. 

  2240.         if (t->fake_index) {

  2241.             /* behave as if we have a proper index */

  2242.             if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)

  2243.                 return sample_time;

  2244.         } else {

  2245.             /* no IndexEntryArray (one or more CBR segments)

  2246.              * make sure we don't seek past the end */

  2247.             sample_time = FFMIN(sample_time, st->duration - 1);

  2248.         }

  2249. 

  2250.         if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)

  2251.             return ret;

  2252. 

  2253.         ff_update_cur_dts(s, st, sample_time);

  2254.         mxf->current_edit_unit = sample_time;

  2255.         avio_seek(s->pb, seekpos, SEEK_SET);

  2256.     }

  2257.     return 0;

  2258. }

  2259. 

  2260. AVInputFormat ff_mxf_demuxer = {

  2261.     .name           = "mxf",

  2262.     .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),

  2263.     .priv_data_size = sizeof(MXFContext),

  2264.     .read_probe     = mxf_probe,

  2265.     .read_header    = mxf_read_header,

  2266.     .read_packet    = mxf_read_packet,

  2267.     .read_close     = mxf_read_close,

  2268.     .read_seek      = mxf_read_seek,

  2269. };