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FFmpeg/libavformat/matroskaenc.c

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  1. /*

  2.  * Matroska muxer

  3.  * Copyright (c) 2007 David Conrad

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. #include "avc.h"

  23. #include "avformat.h"

  24. #include "avio_internal.h"

  25. #include "avlanguage.h"

  26. #include "flacenc.h"

  27. #include "internal.h"

  28. #include "isom.h"

  29. #include "matroska.h"

  30. #include "riff.h"

  31. #include "subtitles.h"

  32. #include "wv.h"

  33. 

  34. #include "libavutil/avstring.h"

  35. #include "libavutil/dict.h"

  36. #include "libavutil/intfloat.h"

  37. #include "libavutil/intreadwrite.h"

  38. #include "libavutil/lfg.h"

  39. #include "libavutil/mathematics.h"

  40. #include "libavutil/opt.h"

  41. #include "libavutil/random_seed.h"

  42. #include "libavutil/samplefmt.h"

  43. #include "libavutil/sha.h"

  44. 

  45. #include "libavcodec/xiph.h"

  46. #include "libavcodec/mpeg4audio.h"

  47. #include "libavcodec/internal.h"

  48. 

  49. typedef struct ebml_master {

  50.     int64_t         pos;                ///< absolute offset in the file where the master's elements start

  51.     int             sizebytes;          ///< how many bytes were reserved for the size

  52. } ebml_master;

  53. 

  54. typedef struct mkv_seekhead_entry {

  55.     unsigned int    elementid;

  56.     uint64_t        segmentpos;

  57. } mkv_seekhead_entry;

  58. 

  59. typedef struct mkv_seekhead {

  60.     int64_t                 filepos;

  61.     int64_t                 segment_offset;     ///< the file offset to the beginning of the segment

  62.     int                     reserved_size;      ///< -1 if appending to file

  63.     int                     max_entries;

  64.     mkv_seekhead_entry      *entries;

  65.     int                     num_entries;

  66. } mkv_seekhead;

  67. 

  68. typedef struct {

  69.     uint64_t        pts;

  70.     int             tracknum;

  71.     int64_t         cluster_pos;        ///< file offset of the cluster containing the block

  72.     int64_t         relative_pos;       ///< relative offset from the position of the cluster containing the block

  73.     int64_t         duration;           ///< duration of the block according to time base

  74. } mkv_cuepoint;

  75. 

  76. typedef struct {

  77.     int64_t         segment_offset;

  78.     mkv_cuepoint    *entries;

  79.     int             num_entries;

  80. } mkv_cues;

  81. 

  82. typedef struct {

  83.     int             write_dts;

  84.     int             has_cue;

  85. } mkv_track;

  86. 

  87. #define MODE_MATROSKAv2 0x01

  88. #define MODE_WEBM       0x02

  89. 

  90. typedef struct MatroskaMuxContext {

  91.     const AVClass  *class;

  92.     int             mode;

  93.     AVIOContext   *dyn_bc;

  94.     ebml_master     segment;

  95.     int64_t         segment_offset;

  96.     ebml_master     cluster;

  97.     int64_t         cluster_pos;        ///< file offset of the current cluster

  98.     int64_t         cluster_pts;

  99.     int64_t         duration_offset;

  100.     int64_t         duration;

  101.     mkv_seekhead    *main_seekhead;

  102.     mkv_cues        *cues;

  103.     mkv_track       *tracks;

  104. 

  105.     AVPacket        cur_audio_pkt;

  106. 

  107.     int have_attachments;

  108. 

  109.     int reserve_cues_space;

  110.     int cluster_size_limit;

  111.     int64_t cues_pos;

  112.     int64_t cluster_time_limit;

  113. 

  114.     uint32_t chapter_id_offset;

  115.     int wrote_chapters;

  116. } MatroskaMuxContext;

  117. 

  118. 

  119. /** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit

  120.  * offset, 4 bytes for target EBML ID */

  121. #define MAX_SEEKENTRY_SIZE 21

  122. 

  123. /** per-cuepoint-track - 5 1-byte EBML IDs, 5 1-byte EBML sizes, 4

  124.  * 8-byte uint max */

  125. #define MAX_CUETRACKPOS_SIZE 42

  126. 

  127. /** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */

  128. #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks

  129. 

  130. /** Seek preroll value for opus */

  131. #define OPUS_SEEK_PREROLL 80000000

  132. 

  133. 

  134. static int ebml_id_size(unsigned int id)

  135. {

  136.     return (av_log2(id+1)-1)/7+1;

  137. }

  138. 

  139. static void put_ebml_id(AVIOContext *pb, unsigned int id)

  140. {

  141.     int i = ebml_id_size(id);

  142.     while (i--)

  143.         avio_w8(pb, (uint8_t)(id >> (i*8)));

  144. }

  145. 

  146. /**

  147.  * Write an EBML size meaning "unknown size".

  148.  *

  149.  * @param bytes The number of bytes the size should occupy (maximum: 8).

  150.  */

  151. static void put_ebml_size_unknown(AVIOContext *pb, int bytes)

  152. {

  153.     av_assert0(bytes <= 8);

  154.     avio_w8(pb, 0x1ff >> bytes);

  155.     ffio_fill(pb, 0xff, bytes - 1);

  156. }

  157. 

  158. /**

  159.  * Calculate how many bytes are needed to represent a given number in EBML.

  160.  */

  161. static int ebml_num_size(uint64_t num)

  162. {

  163.     int bytes = 1;

  164.     while ((num+1) >> bytes*7) bytes++;

  165.     return bytes;

  166. }

  167. 

  168. /**

  169.  * Write a number in EBML variable length format.

  170.  *

  171.  * @param bytes The number of bytes that need to be used to write the number.

  172.  *              If zero, any number of bytes can be used.

  173.  */

  174. static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)

  175. {

  176.     int i, needed_bytes = ebml_num_size(num);

  177. 

  178.     // sizes larger than this are currently undefined in EBML

  179.     av_assert0(num < (1ULL<<56)-1);

  180. 

  181.     if (bytes == 0)

  182.         // don't care how many bytes are used, so use the min

  183.         bytes = needed_bytes;

  184.     // the bytes needed to write the given size would exceed the bytes

  185.     // that we need to use, so write unknown size. This shouldn't happen.

  186.     av_assert0(bytes >= needed_bytes);

  187. 

  188.     num |= 1ULL << bytes*7;

  189.     for (i = bytes - 1; i >= 0; i--)

  190.         avio_w8(pb, (uint8_t)(num >> i*8));

  191. }

  192. 

  193. static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)

  194. {

  195.     int i, bytes = 1;

  196.     uint64_t tmp = val;

  197.     while (tmp>>=8) bytes++;

  198. 

  199.     put_ebml_id(pb, elementid);

  200.     put_ebml_num(pb, bytes, 0);

  201.     for (i = bytes - 1; i >= 0; i--)

  202.         avio_w8(pb, (uint8_t)(val >> i*8));

  203. }

  204. 

  205. static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)

  206. {

  207.     put_ebml_id(pb, elementid);

  208.     put_ebml_num(pb, 8, 0);

  209.     avio_wb64(pb, av_double2int(val));

  210. }

  211. 

  212. static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,

  213.                             const void *buf, int size)

  214. {

  215.     put_ebml_id(pb, elementid);

  216.     put_ebml_num(pb, size, 0);

  217.     avio_write(pb, buf, size);

  218. }

  219. 

  220. static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)

  221. {

  222.     put_ebml_binary(pb, elementid, str, strlen(str));

  223. }

  224. 

  225. /**

  226.  * Write a void element of a given size. Useful for reserving space in

  227.  * the file to be written to later.

  228.  *

  229.  * @param size The number of bytes to reserve, which must be at least 2.

  230.  */

  231. static void put_ebml_void(AVIOContext *pb, uint64_t size)

  232. {

  233.     int64_t currentpos = avio_tell(pb);

  234. 

  235.     av_assert0(size >= 2);

  236. 

  237.     put_ebml_id(pb, EBML_ID_VOID);

  238.     // we need to subtract the length needed to store the size from the

  239.     // size we need to reserve so 2 cases, we use 8 bytes to store the

  240.     // size if possible, 1 byte otherwise

  241.     if (size < 10)

  242.         put_ebml_num(pb, size-1, 0);

  243.     else

  244.         put_ebml_num(pb, size-9, 8);

  245.     ffio_fill(pb, 0, currentpos + size - avio_tell(pb));

  246. }

  247. 

  248. static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)

  249. {

  250.     int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;

  251.     put_ebml_id(pb, elementid);

  252.     put_ebml_size_unknown(pb, bytes);

  253.     return (ebml_master){ avio_tell(pb), bytes };

  254. }

  255. 

  256. static void end_ebml_master(AVIOContext *pb, ebml_master master)

  257. {

  258.     int64_t pos = avio_tell(pb);

  259. 

  260.     if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)

  261.         return;

  262.     put_ebml_num(pb, pos - master.pos, master.sizebytes);

  263.     avio_seek(pb, pos, SEEK_SET);

  264. }

  265. 

  266. static void put_xiph_size(AVIOContext *pb, int size)

  267. {

  268.     ffio_fill(pb, 255, size / 255);

  269.     avio_w8(pb, size % 255);

  270. }

  271. 

  272. /**

  273.  * Initialize a mkv_seekhead element to be ready to index level 1 Matroska

  274.  * elements. If a maximum number of elements is specified, enough space

  275.  * will be reserved at the current file location to write a seek head of

  276.  * that size.

  277.  *

  278.  * @param segment_offset The absolute offset to the position in the file

  279.  *                       where the segment begins.

  280.  * @param numelements The maximum number of elements that will be indexed

  281.  *                    by this seek head, 0 if unlimited.

  282.  */

  283. static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)

  284. {

  285.     mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));

  286.     if (new_seekhead == NULL)

  287.         return NULL;

  288. 

  289.     new_seekhead->segment_offset = segment_offset;

  290. 

  291.     if (numelements > 0) {

  292.         new_seekhead->filepos = avio_tell(pb);

  293.         // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID

  294.         // and size, and 3 bytes to guarantee that an EBML void element

  295.         // will fit afterwards

  296.         new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;

  297.         new_seekhead->max_entries = numelements;

  298.         put_ebml_void(pb, new_seekhead->reserved_size);

  299.     }

  300.     return new_seekhead;

  301. }

  302. 

  303. static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)

  304. {

  305.     mkv_seekhead_entry *entries = seekhead->entries;

  306. 

  307.     // don't store more elements than we reserved space for

  308.     if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)

  309.         return -1;

  310. 

  311.     entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));

  312.     if (entries == NULL)

  313.         return AVERROR(ENOMEM);

  314.     seekhead->entries = entries;

  315. 

  316.     seekhead->entries[seekhead->num_entries].elementid    = elementid;

  317.     seekhead->entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;

  318. 

  319.     return 0;

  320. }

  321. 

  322. /**

  323.  * Write the seek head to the file and free it. If a maximum number of

  324.  * elements was specified to mkv_start_seekhead(), the seek head will

  325.  * be written at the location reserved for it. Otherwise, it is written

  326.  * at the current location in the file.

  327.  *

  328.  * @return The file offset where the seekhead was written,

  329.  * -1 if an error occurred.

  330.  */

  331. static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)

  332. {

  333.     ebml_master metaseek, seekentry;

  334.     int64_t currentpos;

  335.     int i;

  336. 

  337.     currentpos = avio_tell(pb);

  338. 

  339.     if (seekhead->reserved_size > 0) {

  340.         if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0) {

  341.             currentpos = -1;

  342.             goto fail;

  343.         }

  344.     }

  345. 

  346.     metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);

  347.     for (i = 0; i < seekhead->num_entries; i++) {

  348.         mkv_seekhead_entry *entry = &seekhead->entries[i];

  349. 

  350.         seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);

  351. 

  352.         put_ebml_id(pb, MATROSKA_ID_SEEKID);

  353.         put_ebml_num(pb, ebml_id_size(entry->elementid), 0);

  354.         put_ebml_id(pb, entry->elementid);

  355. 

  356.         put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);

  357.         end_ebml_master(pb, seekentry);

  358.     }

  359.     end_ebml_master(pb, metaseek);

  360. 

  361.     if (seekhead->reserved_size > 0) {

  362.         uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);

  363.         put_ebml_void(pb, remaining);

  364.         avio_seek(pb, currentpos, SEEK_SET);

  365. 

  366.         currentpos = seekhead->filepos;

  367.     }

  368. fail:

  369.     av_freep(&seekhead->entries);

  370.     av_free(seekhead);

  371. 

  372.     return currentpos;

  373. }

  374. 

  375. static mkv_cues * mkv_start_cues(int64_t segment_offset)

  376. {

  377.     mkv_cues *cues = av_mallocz(sizeof(mkv_cues));

  378.     if (cues == NULL)

  379.         return NULL;

  380. 

  381.     cues->segment_offset = segment_offset;

  382.     return cues;

  383. }

  384. 

  385. static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos,

  386.                             int64_t duration)

  387. {

  388.     mkv_cuepoint *entries = cues->entries;

  389. 

  390.     if (ts < 0)

  391.         return 0;

  392. 

  393.     entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));

  394.     if (entries == NULL)

  395.         return AVERROR(ENOMEM);

  396.     cues->entries = entries;

  397. 

  398.     cues->entries[cues->num_entries].pts           = ts;

  399.     cues->entries[cues->num_entries].tracknum      = stream + 1;

  400.     cues->entries[cues->num_entries].cluster_pos   = cluster_pos - cues->segment_offset;

  401.     cues->entries[cues->num_entries].relative_pos  = relative_pos;

  402.     cues->entries[cues->num_entries++].duration    = duration;

  403. 

  404.     return 0;

  405. }

  406. 

  407. static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks, int num_tracks)

  408. {

  409.     ebml_master cues_element;

  410.     int64_t currentpos;

  411.     int i, j;

  412. 

  413.     currentpos = avio_tell(pb);

  414.     cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);

  415. 

  416.     for (i = 0; i < cues->num_entries; i++) {

  417.         ebml_master cuepoint, track_positions;

  418.         mkv_cuepoint *entry = &cues->entries[i];

  419.         uint64_t pts = entry->pts;

  420. 

  421.         cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));

  422.         put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);

  423. 

  424.         // put all the entries from different tracks that have the exact same

  425.         // timestamp into the same CuePoint

  426.         for (j = 0; j < num_tracks; j++)

  427.             tracks[j].has_cue = 0;

  428.         for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {

  429.             int tracknum = entry[j].tracknum - 1;

  430.             av_assert0(tracknum>=0 && tracknum<num_tracks);

  431.             if (tracks[tracknum].has_cue)

  432.                 continue;

  433.             tracks[tracknum].has_cue = 1;

  434.             track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);

  435.             put_ebml_uint(pb, MATROSKA_ID_CUETRACK           , entry[j].tracknum   );

  436.             put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION , entry[j].cluster_pos);

  437.             put_ebml_uint(pb, MATROSKA_ID_CUERELATIVEPOSITION, entry[j].relative_pos);

  438.             if (entry[j].duration != -1)

  439.                 put_ebml_uint(pb, MATROSKA_ID_CUEDURATION    , entry[j].duration);

  440.             end_ebml_master(pb, track_positions);

  441.         }

  442.         i += j - 1;

  443.         end_ebml_master(pb, cuepoint);

  444.     }

  445.     end_ebml_master(pb, cues_element);

  446. 

  447.     return currentpos;

  448. }

  449. 

  450. static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)

  451. {

  452.     uint8_t *header_start[3];

  453.     int header_len[3];

  454.     int first_header_size;

  455.     int j;

  456. 

  457.     if (codec->codec_id == AV_CODEC_ID_VORBIS)

  458.         first_header_size = 30;

  459.     else

  460.         first_header_size = 42;

  461. 

  462.     if (avpriv_split_xiph_headers(codec->extradata, codec->extradata_size,

  463.                               first_header_size, header_start, header_len) < 0) {

  464.         av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");

  465.         return -1;

  466.     }

  467. 

  468.     avio_w8(pb, 2);                    // number packets - 1

  469.     for (j = 0; j < 2; j++) {

  470.         put_xiph_size(pb, header_len[j]);

  471.     }

  472.     for (j = 0; j < 3; j++)

  473.         avio_write(pb, header_start[j], header_len[j]);

  474. 

  475.     return 0;

  476. }

  477. 

  478. static int put_wv_codecpriv(AVIOContext *pb, AVCodecContext *codec)

  479. {

  480.     if (codec->extradata && codec->extradata_size == 2)

  481.         avio_write(pb, codec->extradata, 2);

  482.     else

  483.         avio_wl16(pb, 0x403); // fallback to the version mentioned in matroska specs

  484.     return 0;

  485. }

  486. 

  487. static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)

  488. {

  489.     MPEG4AudioConfig mp4ac;

  490. 

  491.     if (avpriv_mpeg4audio_get_config(&mp4ac, codec->extradata,

  492.                                      codec->extradata_size * 8, 1) < 0) {

  493.         av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");

  494.         return;

  495.     }

  496. 

  497.     *sample_rate        = mp4ac.sample_rate;

  498.     *output_sample_rate = mp4ac.ext_sample_rate;

  499. }

  500. 

  501. static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)

  502. {

  503.     AVIOContext *dyn_cp;

  504.     uint8_t *codecpriv;

  505.     int ret, codecpriv_size;

  506. 

  507.     ret = avio_open_dyn_buf(&dyn_cp);

  508.     if(ret < 0)

  509.         return ret;

  510. 

  511.     if (native_id) {

  512.         if (codec->codec_id == AV_CODEC_ID_VORBIS || codec->codec_id == AV_CODEC_ID_THEORA)

  513.             ret = put_xiph_codecpriv(s, dyn_cp, codec);

  514.         else if (codec->codec_id == AV_CODEC_ID_FLAC)

  515.             ret = ff_flac_write_header(dyn_cp, codec, 1);

  516.         else if (codec->codec_id == AV_CODEC_ID_WAVPACK)

  517.             ret = put_wv_codecpriv(dyn_cp, codec);

  518.         else if (codec->codec_id == AV_CODEC_ID_H264)

  519.             ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);

  520.         else if (codec->codec_id == AV_CODEC_ID_ALAC) {

  521.             if (codec->extradata_size < 36) {

  522.                 av_log(s, AV_LOG_ERROR,

  523.                        "Invalid extradata found, ALAC expects a 36-byte "

  524.                        "QuickTime atom.");

  525.                 ret = AVERROR_INVALIDDATA;

  526.             } else

  527.                 avio_write(dyn_cp, codec->extradata + 12,

  528.                                    codec->extradata_size - 12);

  529.         }

  530.         else if (codec->extradata_size && codec->codec_id != AV_CODEC_ID_TTA)

  531.             avio_write(dyn_cp, codec->extradata, codec->extradata_size);

  532.     } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  533.         if (qt_id) {

  534.             if (!codec->codec_tag)

  535.                 codec->codec_tag = ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id);

  536.             if (codec->extradata_size)

  537.                 avio_write(dyn_cp, codec->extradata, codec->extradata_size);

  538.         } else {

  539.             if (!codec->codec_tag)

  540.                 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);

  541.             if (!codec->codec_tag) {

  542.                 av_log(s, AV_LOG_ERROR, "No bmp codec tag found for codec %s\n",

  543.                        avcodec_get_name(codec->codec_id));

  544.                 ret = AVERROR(EINVAL);

  545.             }

  546. 

  547.             ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);

  548.         }

  549. 

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

  551.         unsigned int tag;

  552.         tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);

  553.         if (!tag) {

  554.             av_log(s, AV_LOG_ERROR, "No wav codec tag found for codec %s\n",

  555.                    avcodec_get_name(codec->codec_id));

  556.             ret = AVERROR(EINVAL);

  557.         }

  558.         if (!codec->codec_tag)

  559.             codec->codec_tag = tag;

  560. 

  561.         ff_put_wav_header(dyn_cp, codec);

  562.     }

  563. 

  564.     codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);

  565.     if (codecpriv_size)

  566.         put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);

  567.     av_free(codecpriv);

  568.     return ret;

  569. }

  570. 

  571. static int mkv_write_tracks(AVFormatContext *s)

  572. {

  573.     MatroskaMuxContext *mkv = s->priv_data;

  574.     AVIOContext *pb = s->pb;

  575.     ebml_master tracks;

  576.     int i, j, ret, default_stream_exists = 0;

  577. 

  578.     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));

  579.     if (ret < 0) return ret;

  580. 

  581.     tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);

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

  583.         AVStream *st = s->streams[i];

  584.         default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;

  585.     }

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

  587.         AVStream *st = s->streams[i];

  588.         AVCodecContext *codec = st->codec;

  589.         ebml_master subinfo, track;

  590.         int native_id = 0;

  591.         int qt_id = 0;

  592.         int bit_depth = av_get_bits_per_sample(codec->codec_id);

  593.         int sample_rate = codec->sample_rate;

  594.         int output_sample_rate = 0;

  595.         int display_width_div = 1;

  596.         int display_height_div = 1;

  597.         AVDictionaryEntry *tag;

  598. 

  599.         if (codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {

  600.             mkv->have_attachments = 1;

  601.             continue;

  602.         }

  603. 

  604.         if (!bit_depth)

  605.             bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;

  606.         if (!bit_depth)

  607.             bit_depth = codec->bits_per_coded_sample;

  608. 

  609.         if (codec->codec_id == AV_CODEC_ID_AAC)

  610.             get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);

  611. 

  612.         track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);

  613.         put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER     , i + 1);

  614.         put_ebml_uint (pb, MATROSKA_ID_TRACKUID        , i + 1);

  615.         put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0);    // no lacing (yet)

  616. 

  617.         if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))

  618.             put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);

  619.         tag = av_dict_get(st->metadata, "language", NULL, 0);

  620.         if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {

  621.             put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");

  622.         } else if (tag && tag->value) {

  623.             put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag->value);

  624.         }

  625. 

  626.         // The default value for TRACKFLAGDEFAULT is 1, so add element

  627.         // if we need to clear it.

  628.         if (default_stream_exists && !(st->disposition & AV_DISPOSITION_DEFAULT))

  629.             put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));

  630. 

  631.         if (st->disposition & AV_DISPOSITION_FORCED)

  632.             put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGFORCED, 1);

  633. 

  634.         if (mkv->mode == MODE_WEBM && codec->codec_id == AV_CODEC_ID_WEBVTT) {

  635.             const char *codec_id;

  636.             if (st->disposition & AV_DISPOSITION_CAPTIONS) {

  637.                 codec_id = "D_WEBVTT/CAPTIONS";

  638.                 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;

  639.             } else if (st->disposition & AV_DISPOSITION_DESCRIPTIONS) {

  640.                 codec_id = "D_WEBVTT/DESCRIPTIONS";

  641.                 native_id = MATROSKA_TRACK_TYPE_METADATA;

  642.             } else if (st->disposition & AV_DISPOSITION_METADATA) {

  643.                 codec_id = "D_WEBVTT/METADATA";

  644.                 native_id = MATROSKA_TRACK_TYPE_METADATA;

  645.             } else {

  646.                 codec_id = "D_WEBVTT/SUBTITLES";

  647.                 native_id = MATROSKA_TRACK_TYPE_SUBTITLE;

  648.             }

  649.             put_ebml_string(pb, MATROSKA_ID_CODECID, codec_id);

  650.         } else {

  651.             // look for a codec ID string specific to mkv to use,

  652.             // if none are found, use AVI codes

  653.             for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {

  654.                 if (ff_mkv_codec_tags[j].id == codec->codec_id) {

  655.                     put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);

  656.                     native_id = 1;

  657.                     break;

  658.                 }

  659.             }

  660.         }

  661. 

  662.         if (codec->codec_id == AV_CODEC_ID_OPUS) {

  663.             uint64_t codec_delay =av_rescale_q(codec->delay,

  664.                                                (AVRational){1, codec->sample_rate},

  665.                                                (AVRational){1, 1000000000});

  666.             put_ebml_uint(pb, MATROSKA_ID_CODECDELAY, codec_delay);

  667.             put_ebml_uint(pb, MATROSKA_ID_SEEKPREROLL, OPUS_SEEK_PREROLL);

  668. 

  669.         }

  670. 

  671.         if (mkv->mode == MODE_WEBM && !(codec->codec_id == AV_CODEC_ID_VP8 ||

  672.                                         codec->codec_id == AV_CODEC_ID_VP9 ||

  673.                                       ((codec->codec_id == AV_CODEC_ID_OPUS)&&(codec->strict_std_compliance <= FF_COMPLIANCE_EXPERIMENTAL)) ||

  674.                                         codec->codec_id == AV_CODEC_ID_VORBIS ||

  675.                                         codec->codec_id == AV_CODEC_ID_WEBVTT)) {

  676.             av_log(s, AV_LOG_ERROR,

  677.                    "Only VP8,VP9 video and Vorbis,Opus(experimental, use -strict -2) audio and WebVTT subtitles are supported for WebM.\n");

  678.             return AVERROR(EINVAL);

  679.         }

  680. 

  681.         switch (codec->codec_type) {

  682.             case AVMEDIA_TYPE_VIDEO:

  683.                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);

  684.                 if(st->avg_frame_rate.num && st->avg_frame_rate.den && 1.0/av_q2d(st->avg_frame_rate) > av_q2d(codec->time_base))

  685.                     put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, 1E9/av_q2d(st->avg_frame_rate));

  686.                 else

  687.                     put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);

  688. 

  689.                 if (!native_id &&

  690.                       ff_codec_get_tag(ff_codec_movvideo_tags, codec->codec_id) &&

  691.                     (!ff_codec_get_tag(ff_codec_bmp_tags,   codec->codec_id)

  692.                      || codec->codec_id == AV_CODEC_ID_SVQ1

  693.                      || codec->codec_id == AV_CODEC_ID_SVQ3

  694.                      || codec->codec_id == AV_CODEC_ID_CINEPAK))

  695.                     qt_id = 1;

  696. 

  697.                 if (qt_id)

  698.                     put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");

  699.                 else if (!native_id) {

  700.                     // if there is no mkv-specific codec ID, use VFW mode

  701.                     put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");

  702.                     mkv->tracks[i].write_dts = 1;

  703.                 }

  704. 

  705.                 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);

  706.                 // XXX: interlace flag?

  707.                 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);

  708.                 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);

  709. 

  710.                 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||

  711.                     (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {

  712.                     // save stereo mode flag

  713.                     uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;

  714. 

  715.                     for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)

  716.                         if (!strcmp(tag->value, ff_matroska_video_stereo_mode[j])){

  717.                             st_mode = j;

  718.                             break;

  719.                         }

  720. 

  721.                     if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)

  722.                         || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {

  723.                         av_log(s, AV_LOG_ERROR,

  724.                                "The specified stereo mode is not valid.\n");

  725.                         return AVERROR(EINVAL);

  726.                     } else

  727.                         put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);

  728. 

  729.                     switch (st_mode) {

  730.                     case 1:

  731.                     case 8:

  732.                     case 9:

  733.                     case 11:

  734.                         display_width_div = 2;

  735.                         break;

  736.                     case 2:

  737.                     case 3:

  738.                     case 6:

  739.                     case 7:

  740.                         display_height_div = 2;

  741.                         break;

  742.                     }

  743.                 }

  744. 

  745.                 if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||

  746.                     (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||

  747.                     (codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {

  748.                     put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);

  749.                 }

  750. 

  751.                 if (st->sample_aspect_ratio.num) {

  752.                     int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

  753.                     if (d_width > INT_MAX) {

  754.                         av_log(s, AV_LOG_ERROR, "Overflow in display width\n");

  755.                         return AVERROR(EINVAL);

  756.                     }

  757.                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width / display_width_div);

  758.                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);

  759.                 } else if (display_width_div != 1 || display_height_div != 1) {

  760.                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , codec->width / display_width_div);

  761.                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height / display_height_div);

  762.                 }

  763. 

  764.                 if (codec->codec_id == AV_CODEC_ID_RAWVIDEO) {

  765.                     uint32_t color_space = av_le2ne32(codec->codec_tag);

  766.                     put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));

  767.                 }

  768.                 end_ebml_master(pb, subinfo);

  769.                 break;

  770. 

  771.             case AVMEDIA_TYPE_AUDIO:

  772.                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);

  773. 

  774.                 if (!native_id)

  775.                     // no mkv-specific ID, use ACM mode

  776.                     put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");

  777. 

  778.                 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);

  779.                 put_ebml_uint  (pb, MATROSKA_ID_AUDIOCHANNELS    , codec->channels);

  780.                 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);

  781.                 if (output_sample_rate)

  782.                     put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);

  783.                 if (bit_depth)

  784.                     put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);

  785.                 end_ebml_master(pb, subinfo);

  786.                 break;

  787. 

  788.             case AVMEDIA_TYPE_SUBTITLE:

  789.                 if (!native_id) {

  790.                     av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);

  791.                     return AVERROR(ENOSYS);

  792.                 }

  793. 

  794.                 if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT)

  795.                     native_id = MATROSKA_TRACK_TYPE_SUBTITLE;

  796. 

  797.                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, native_id);

  798.                 break;

  799.             default:

  800.                 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");

  801.                 return AVERROR(EINVAL);

  802.         }

  803. 

  804.         if (mkv->mode != MODE_WEBM || codec->codec_id != AV_CODEC_ID_WEBVTT) {

  805.             ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);

  806.             if (ret < 0) return ret;

  807.         }

  808. 

  809.         end_ebml_master(pb, track);

  810. 

  811.         // ms precision is the de-facto standard timescale for mkv files

  812.         avpriv_set_pts_info(st, 64, 1, 1000);

  813.     }

  814.     end_ebml_master(pb, tracks);

  815.     return 0;

  816. }

  817. 

  818. static int mkv_write_chapters(AVFormatContext *s)

  819. {

  820.     MatroskaMuxContext *mkv = s->priv_data;

  821.     AVIOContext *pb = s->pb;

  822.     ebml_master chapters, editionentry;

  823.     AVRational scale = {1, 1E9};

  824.     int i, ret;

  825. 

  826.     if (!s->nb_chapters || mkv->wrote_chapters)

  827.         return 0;

  828. 

  829.     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));

  830.     if (ret < 0) return ret;

  831. 

  832.     chapters     = start_ebml_master(pb, MATROSKA_ID_CHAPTERS    , 0);

  833.     editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);

  834.     put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);

  835.     put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);

  836.     for (i = 0; i < s->nb_chapters; i++) {

  837.         ebml_master chapteratom, chapterdisplay;

  838.         AVChapter *c     = s->chapters[i];

  839.         AVDictionaryEntry *t = NULL;

  840. 

  841.         chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);

  842.         put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id + mkv->chapter_id_offset);

  843.         put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,

  844.                       av_rescale_q(c->start, c->time_base, scale));

  845.         put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,

  846.                       av_rescale_q(c->end,   c->time_base, scale));

  847.         put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);

  848.         put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);

  849.         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {

  850.             chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);

  851.             put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);

  852.             put_ebml_string(pb, MATROSKA_ID_CHAPLANG  , "und");

  853.             end_ebml_master(pb, chapterdisplay);

  854.         }

  855.         end_ebml_master(pb, chapteratom);

  856.     }

  857.     end_ebml_master(pb, editionentry);

  858.     end_ebml_master(pb, chapters);

  859. 

  860.     mkv->wrote_chapters = 1;

  861.     return 0;

  862. }

  863. 

  864. static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)

  865. {

  866.     uint8_t *key = av_strdup(t->key);

  867.     uint8_t *p   = key;

  868.     const uint8_t *lang = NULL;

  869.     ebml_master tag;

  870. 

  871.     if ((p = strrchr(p, '-')) &&

  872.         (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))

  873.         *p = 0;

  874. 

  875.     p = key;

  876.     while (*p) {

  877.         if (*p == ' ')

  878.             *p = '_';

  879.         else if (*p >= 'a' && *p <= 'z')

  880.             *p -= 'a' - 'A';

  881.         p++;

  882.     }

  883. 

  884.     tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);

  885.     put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);

  886.     if (lang)

  887.         put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);

  888.     put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);

  889.     end_ebml_master(pb, tag);

  890. 

  891.     av_freep(&key);

  892. }

  893. 

  894. static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,

  895.                          unsigned int uid, ebml_master *tags)

  896. {

  897.     MatroskaMuxContext *mkv = s->priv_data;

  898.     ebml_master tag, targets;

  899.     AVDictionaryEntry *t = NULL;

  900.     int ret;

  901. 

  902.     if (!tags->pos) {

  903.         ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));

  904.         if (ret < 0) return ret;

  905. 

  906.         *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);

  907.     }

  908. 

  909.     tag     = start_ebml_master(s->pb, MATROSKA_ID_TAG,        0);

  910.     targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);

  911.     if (elementid)

  912.         put_ebml_uint(s->pb, elementid, uid);

  913.     end_ebml_master(s->pb, targets);

  914. 

  915.     while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))

  916.         if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))

  917.             mkv_write_simpletag(s->pb, t);

  918. 

  919.     end_ebml_master(s->pb, tag);

  920.     return 0;

  921. }

  922. 

  923. static int mkv_check_tag(AVDictionary *m)

  924. {

  925.     AVDictionaryEntry *t = NULL;

  926. 

  927.     while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))

  928.         if (av_strcasecmp(t->key, "title") && av_strcasecmp(t->key, "stereo_mode"))

  929.             return 1;

  930. 

  931.     return 0;

  932. }

  933. 

  934. static int mkv_write_tags(AVFormatContext *s)

  935. {

  936.     MatroskaMuxContext *mkv = s->priv_data;

  937.     ebml_master tags = {0};

  938.     int i, ret;

  939. 

  940.     ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);

  941. 

  942.     if (mkv_check_tag(s->metadata)) {

  943.         ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);

  944.         if (ret < 0) return ret;

  945.     }

  946. 

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

  948.         AVStream *st = s->streams[i];

  949. 

  950.         if (!mkv_check_tag(st->metadata))

  951.             continue;

  952. 

  953.         ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);

  954.         if (ret < 0) return ret;

  955.     }

  956. 

  957.     for (i = 0; i < s->nb_chapters; i++) {

  958.         AVChapter *ch = s->chapters[i];

  959. 

  960.         if (!mkv_check_tag(ch->metadata))

  961.             continue;

  962. 

  963.         ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &tags);

  964.         if (ret < 0) return ret;

  965.     }

  966. 

  967.     if (tags.pos)

  968.         end_ebml_master(s->pb, tags);

  969.     return 0;

  970. }

  971. 

  972. static int mkv_write_attachments(AVFormatContext *s)

  973. {

  974.     MatroskaMuxContext *mkv = s->priv_data;

  975.     AVIOContext *pb = s->pb;

  976.     ebml_master attachments;

  977.     AVLFG c;

  978.     int i, ret;

  979. 

  980.     if (!mkv->have_attachments)

  981.         return 0;

  982. 

  983.     av_lfg_init(&c, av_get_random_seed());

  984. 

  985.     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));

  986.     if (ret < 0) return ret;

  987. 

  988.     attachments = start_ebml_master(pb, MATROSKA_ID_ATTACHMENTS, 0);

  989. 

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

  991.         AVStream *st = s->streams[i];

  992.         ebml_master attached_file;

  993.         AVDictionaryEntry *t;

  994.         const char *mimetype = NULL;

  995.         uint64_t fileuid;

  996. 

  997.         if (st->codec->codec_type != AVMEDIA_TYPE_ATTACHMENT)

  998.             continue;

  999. 

  1000.         attached_file = start_ebml_master(pb, MATROSKA_ID_ATTACHEDFILE, 0);

  1001. 

  1002.         if (t = av_dict_get(st->metadata, "title", NULL, 0))

  1003.             put_ebml_string(pb, MATROSKA_ID_FILEDESC, t->value);

  1004.         if (!(t = av_dict_get(st->metadata, "filename", NULL, 0))) {

  1005.             av_log(s, AV_LOG_ERROR, "Attachment stream %d has no filename tag.\n", i);

  1006.             return AVERROR(EINVAL);

  1007.         }

  1008.         put_ebml_string(pb, MATROSKA_ID_FILENAME, t->value);

  1009.         if (t = av_dict_get(st->metadata, "mimetype", NULL, 0))

  1010.             mimetype = t->value;

  1011.         else if (st->codec->codec_id != AV_CODEC_ID_NONE ) {

  1012.             int i;

  1013.             for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++)

  1014.                 if (ff_mkv_mime_tags[i].id == st->codec->codec_id) {

  1015.                     mimetype = ff_mkv_mime_tags[i].str;

  1016.                     break;

  1017.                 }

  1018.         }

  1019.         if (!mimetype) {

  1020.             av_log(s, AV_LOG_ERROR, "Attachment stream %d has no mimetype tag and "

  1021.                                     "it cannot be deduced from the codec id.\n", i);

  1022.             return AVERROR(EINVAL);

  1023.         }

  1024. 

  1025.         if (st->codec->flags & CODEC_FLAG_BITEXACT) {

  1026.             struct AVSHA *sha = av_sha_alloc();

  1027.             uint8_t digest[20];

  1028.             if (!sha)

  1029.                 return AVERROR(ENOMEM);

  1030.             av_sha_init(sha, 160);

  1031.             av_sha_update(sha, st->codec->extradata, st->codec->extradata_size);

  1032.             av_sha_final(sha, digest);

  1033.             av_free(sha);

  1034.             fileuid = AV_RL64(digest);

  1035.         } else {

  1036.             fileuid = av_lfg_get(&c);

  1037.         }

  1038.         av_log(s, AV_LOG_VERBOSE, "Using %.16"PRIx64" for attachment %d\n",

  1039.                fileuid, i);

  1040. 

  1041.         put_ebml_string(pb, MATROSKA_ID_FILEMIMETYPE, mimetype);

  1042.         put_ebml_binary(pb, MATROSKA_ID_FILEDATA, st->codec->extradata, st->codec->extradata_size);

  1043.         put_ebml_uint(pb, MATROSKA_ID_FILEUID, fileuid);

  1044.         end_ebml_master(pb, attached_file);

  1045.     }

  1046.     end_ebml_master(pb, attachments);

  1047. 

  1048.     return 0;

  1049. }

  1050. 

  1051. static int mkv_write_header(AVFormatContext *s)

  1052. {

  1053.     MatroskaMuxContext *mkv = s->priv_data;

  1054.     AVIOContext *pb = s->pb;

  1055.     ebml_master ebml_header, segment_info;

  1056.     AVDictionaryEntry *tag;

  1057.     int ret, i;

  1058. 

  1059.     if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;

  1060.     else                                   mkv->mode = MODE_MATROSKAv2;

  1061. 

  1062.     if (s->avoid_negative_ts < 0)

  1063.         s->avoid_negative_ts = 1;

  1064. 

  1065.     for (i = 0; i < s->nb_streams; i++)

  1066.         if (s->streams[i]->codec->codec_id == AV_CODEC_ID_ATRAC3 ||

  1067.             s->streams[i]->codec->codec_id == AV_CODEC_ID_COOK ||

  1068.             s->streams[i]->codec->codec_id == AV_CODEC_ID_RA_288 ||

  1069.             s->streams[i]->codec->codec_id == AV_CODEC_ID_SIPR ||

  1070.             s->streams[i]->codec->codec_id == AV_CODEC_ID_RV10 ||

  1071.             s->streams[i]->codec->codec_id == AV_CODEC_ID_RV20) {

  1072.             av_log(s, AV_LOG_ERROR,

  1073.                    "The Matroska muxer does not yet support muxing %s\n",

  1074.                    avcodec_get_name(s->streams[i]->codec->codec_id));

  1075.             return AVERROR_PATCHWELCOME;

  1076.         }

  1077. 

  1078.     mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));

  1079.     if (!mkv->tracks)

  1080.         return AVERROR(ENOMEM);

  1081. 

  1082.     ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);

  1083.     put_ebml_uint   (pb, EBML_ID_EBMLVERSION        ,           1);

  1084.     put_ebml_uint   (pb, EBML_ID_EBMLREADVERSION    ,           1);

  1085.     put_ebml_uint   (pb, EBML_ID_EBMLMAXIDLENGTH    ,           4);

  1086.     put_ebml_uint   (pb, EBML_ID_EBMLMAXSIZELENGTH  ,           8);

  1087.     put_ebml_string (pb, EBML_ID_DOCTYPE            , s->oformat->name);

  1088.     put_ebml_uint   (pb, EBML_ID_DOCTYPEVERSION     ,           4);

  1089.     put_ebml_uint   (pb, EBML_ID_DOCTYPEREADVERSION ,           2);

  1090.     end_ebml_master(pb, ebml_header);

  1091. 

  1092.     mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);

  1093.     mkv->segment_offset = avio_tell(pb);

  1094. 

  1095.     // we write 2 seek heads - one at the end of the file to point to each

  1096.     // cluster, and one at the beginning to point to all other level one

  1097.     // elements (including the seek head at the end of the file), which

  1098.     // isn't more than 10 elements if we only write one of each other

  1099.     // currently defined level 1 element

  1100.     mkv->main_seekhead    = mkv_start_seekhead(pb, mkv->segment_offset, 10);

  1101.     if (!mkv->main_seekhead)

  1102.         return AVERROR(ENOMEM);

  1103. 

  1104.     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));

  1105.     if (ret < 0) return ret;

  1106. 

  1107.     segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);

  1108.     put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);

  1109.     if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))

  1110.         put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);

  1111.     if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {

  1112.         uint32_t segment_uid[4];

  1113.         AVLFG lfg;

  1114. 

  1115.         av_lfg_init(&lfg, av_get_random_seed());

  1116. 

  1117.         for (i = 0; i < 4; i++)

  1118.             segment_uid[i] = av_lfg_get(&lfg);

  1119. 

  1120.         put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);

  1121.         put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);

  1122.         put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);

  1123.     } else {

  1124.         const char *ident = "Lavf";

  1125.         put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , ident);

  1126.         put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, ident);

  1127.     }

  1128. 

  1129.     if (tag = av_dict_get(s->metadata, "creation_time", NULL, 0)) {

  1130.         // Adjust time so it's relative to 2001-01-01 and convert to nanoseconds.

  1131.         int64_t date_utc = (ff_iso8601_to_unix_time(tag->value) - 978307200) * 1000000000;

  1132.         uint8_t date_utc_buf[8];

  1133.         AV_WB64(date_utc_buf, date_utc);

  1134.         put_ebml_binary(pb, MATROSKA_ID_DATEUTC, date_utc_buf, 8);

  1135.     }

  1136. 

  1137.     // reserve space for the duration

  1138.     mkv->duration = 0;

  1139.     mkv->duration_offset = avio_tell(pb);

  1140.     put_ebml_void(pb, 11);                  // assumes double-precision float to be written

  1141.     end_ebml_master(pb, segment_info);

  1142. 

  1143.     ret = mkv_write_tracks(s);

  1144.     if (ret < 0) return ret;

  1145. 

  1146.     for (i = 0; i < s->nb_chapters; i++)

  1147.         mkv->chapter_id_offset = FFMAX(mkv->chapter_id_offset, 1LL - s->chapters[i]->id);

  1148. 

  1149.     if (mkv->mode != MODE_WEBM) {

  1150.         ret = mkv_write_chapters(s);

  1151.         if (ret < 0) return ret;

  1152. 

  1153.         ret = mkv_write_tags(s);

  1154.         if (ret < 0) return ret;

  1155. 

  1156.         ret = mkv_write_attachments(s);

  1157.         if (ret < 0) return ret;

  1158.     }

  1159. 

  1160.     if (!s->pb->seekable)

  1161.         mkv_write_seekhead(pb, mkv->main_seekhead);

  1162. 

  1163.     mkv->cues = mkv_start_cues(mkv->segment_offset);

  1164.     if (mkv->cues == NULL)

  1165.         return AVERROR(ENOMEM);

  1166. 

  1167.     if (pb->seekable && mkv->reserve_cues_space) {

  1168.         mkv->cues_pos = avio_tell(pb);

  1169.         put_ebml_void(pb, mkv->reserve_cues_space);

  1170.     }

  1171. 

  1172.     av_init_packet(&mkv->cur_audio_pkt);

  1173.     mkv->cur_audio_pkt.size = 0;

  1174.     mkv->cluster_pos = -1;

  1175. 

  1176.     avio_flush(pb);

  1177. 

  1178.     // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or

  1179.     // after 4k and on a keyframe

  1180.     if (pb->seekable) {

  1181.         if (mkv->cluster_time_limit < 0)

  1182.             mkv->cluster_time_limit = 5000;

  1183.         if (mkv->cluster_size_limit < 0)

  1184.             mkv->cluster_size_limit = 5 * 1024 * 1024;

  1185.     } else {

  1186.         if (mkv->cluster_time_limit < 0)

  1187.             mkv->cluster_time_limit = 1000;

  1188.         if (mkv->cluster_size_limit < 0)

  1189.             mkv->cluster_size_limit = 32 * 1024;

  1190.     }

  1191. 

  1192.     return 0;

  1193. }

  1194. 

  1195. static int mkv_blockgroup_size(int pkt_size)

  1196. {

  1197.     int size = pkt_size + 4;

  1198.     size += ebml_num_size(size);

  1199.     size += 2;              // EBML ID for block and block duration

  1200.     size += 8;              // max size of block duration

  1201.     size += ebml_num_size(size);

  1202.     size += 1;              // blockgroup EBML ID

  1203.     return size;

  1204. }

  1205. 

  1206. static int ass_get_duration(const uint8_t *p)

  1207. {

  1208.     int sh, sm, ss, sc, eh, em, es, ec;

  1209.     uint64_t start, end;

  1210. 

  1211.     if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",

  1212.                &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)

  1213.         return 0;

  1214.     start = 3600000LL*sh + 60000LL*sm + 1000LL*ss + 10LL*sc;

  1215.     end   = 3600000LL*eh + 60000LL*em + 1000LL*es + 10LL*ec;

  1216.     return end - start;

  1217. }

  1218. 

  1219. #if FF_API_ASS_SSA

  1220. static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  1221. {

  1222.     MatroskaMuxContext *mkv = s->priv_data;

  1223.     int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;

  1224.     uint8_t *start, *end, *data = pkt->data;

  1225.     ebml_master blockgroup;

  1226.     char buffer[2048];

  1227. 

  1228.     while (data_size) {

  1229.         int duration = ass_get_duration(data);

  1230.         max_duration = FFMAX(duration, max_duration);

  1231.         end = memchr(data, '\n', data_size);

  1232.         size = line_size = end ? end-data+1 : data_size;

  1233.         size -= end ? (end[-1]=='\r')+1 : 0;

  1234.         start = data;

  1235.         for (i=0; i<3; i++, start++)

  1236.             if (!(start = memchr(start, ',', size-(start-data))))

  1237.                 return max_duration;

  1238.         size -= start - data;

  1239.         sscanf(data, "Dialogue: %d,", &layer);

  1240.         i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",

  1241.                      s->streams[pkt->stream_index]->nb_frames, layer);

  1242.         size = FFMIN(i+size, sizeof(buffer));

  1243.         memcpy(buffer+i, start, size-i);

  1244. 

  1245.         av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "

  1246.                "pts %" PRId64 ", duration %d\n",

  1247.                avio_tell(pb), size, pkt->pts, duration);

  1248.         blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));

  1249.         put_ebml_id(pb, MATROSKA_ID_BLOCK);

  1250.         put_ebml_num(pb, size+4, 0);

  1251.         avio_w8(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126

  1252.         avio_wb16(pb, pkt->pts - mkv->cluster_pts);

  1253.         avio_w8(pb, 0);

  1254.         avio_write(pb, buffer, size);

  1255.         put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);

  1256.         end_ebml_master(pb, blockgroup);

  1257. 

  1258.         data += line_size;

  1259.         data_size -= line_size;

  1260.     }

  1261. 

  1262.     return max_duration;

  1263. }

  1264. #endif

  1265. 

  1266. static int mkv_strip_wavpack(const uint8_t *src, uint8_t **pdst, int *size)

  1267. {

  1268.     uint8_t *dst;

  1269.     int srclen = *size;

  1270.     int offset = 0;

  1271.     int ret;

  1272. 

  1273.     dst = av_malloc(srclen);

  1274.     if (!dst)

  1275.         return AVERROR(ENOMEM);

  1276. 

  1277.     while (srclen >= WV_HEADER_SIZE) {

  1278.         WvHeader header;

  1279. 

  1280.         ret = ff_wv_parse_header(&header, src);

  1281.         if (ret < 0)

  1282.             goto fail;

  1283.         src    += WV_HEADER_SIZE;

  1284.         srclen -= WV_HEADER_SIZE;

  1285. 

  1286.         if (srclen < header.blocksize) {

  1287.             ret = AVERROR_INVALIDDATA;

  1288.             goto fail;

  1289.         }

  1290. 

  1291.         if (header.initial) {

  1292.             AV_WL32(dst + offset, header.samples);

  1293.             offset += 4;

  1294.         }

  1295.         AV_WL32(dst + offset,     header.flags);

  1296.         AV_WL32(dst + offset + 4, header.crc);

  1297.         offset += 8;

  1298. 

  1299.         if (!(header.initial && header.final)) {

  1300.             AV_WL32(dst + offset, header.blocksize);

  1301.             offset += 4;

  1302.         }

  1303. 

  1304.         memcpy(dst + offset, src, header.blocksize);

  1305.         src    += header.blocksize;

  1306.         srclen -= header.blocksize;

  1307.         offset += header.blocksize;

  1308.     }

  1309. 

  1310.     *pdst = dst;

  1311.     *size = offset;

  1312. 

  1313.     return 0;

  1314. fail:

  1315.     av_freep(&dst);

  1316.     return ret;

  1317. }

  1318. 

  1319. static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,

  1320.                             unsigned int blockid, AVPacket *pkt, int flags)

  1321. {

  1322.     MatroskaMuxContext *mkv = s->priv_data;

  1323.     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;

  1324.     uint8_t *data = NULL, *side_data = NULL;

  1325.     int offset = 0, size = pkt->size, side_data_size = 0;

  1326.     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;

  1327.     uint64_t additional_id = 0, discard_padding = 0;

  1328.     ebml_master block_group, block_additions, block_more;

  1329. 

  1330.     av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "

  1331.            "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",

  1332.            avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);

  1333.     if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 &&

  1334.         (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))

  1335.         ff_avc_parse_nal_units_buf(pkt->data, &data, &size);

  1336.     else if (codec->codec_id == AV_CODEC_ID_WAVPACK) {

  1337.         int ret = mkv_strip_wavpack(pkt->data, &data, &size);

  1338.         if (ret < 0) {

  1339.             av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n");

  1340.             return;

  1341.         }

  1342.     } else

  1343.         data = pkt->data;

  1344. 

  1345.     if (codec->codec_id == AV_CODEC_ID_PRORES) {

  1346.         /* Matroska specification requires to remove the first QuickTime atom

  1347.          */

  1348.         size -= 8;

  1349.         offset = 8;

  1350.     }

  1351. 

  1352.     side_data = av_packet_get_side_data(pkt,

  1353.                                         AV_PKT_DATA_SKIP_SAMPLES,

  1354.                                         &side_data_size);

  1355. 

  1356.     if (side_data && side_data_size >= 10) {

  1357.         discard_padding = av_rescale_q(AV_RL32(side_data + 4),

  1358.                                        (AVRational){1, codec->sample_rate},

  1359.                                        (AVRational){1, 1000000000});

  1360.     }

  1361. 

  1362.     side_data = av_packet_get_side_data(pkt,

  1363.                                         AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,

  1364.                                         &side_data_size);

  1365.     if (side_data) {

  1366.         additional_id = AV_RB64(side_data);

  1367.         side_data += 8;

  1368.         side_data_size -= 8;

  1369.     }

  1370. 

  1371.     if ((side_data_size && additional_id == 1) || discard_padding) {

  1372.         block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);

  1373.         blockid = MATROSKA_ID_BLOCK;

  1374.     }

  1375. 

  1376.     put_ebml_id(pb, blockid);

  1377.     put_ebml_num(pb, size+4, 0);

  1378.     avio_w8(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126

  1379.     avio_wb16(pb, ts - mkv->cluster_pts);

  1380.     avio_w8(pb, flags);

  1381.     avio_write(pb, data + offset, size);

  1382.     if (data != pkt->data)

  1383.         av_free(data);

  1384. 

  1385.     if (discard_padding) {

  1386.         put_ebml_uint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);

  1387.     }

  1388. 

  1389.     if (side_data_size && additional_id == 1) {

  1390.         block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0);

  1391.         block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0);

  1392.         put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1);

  1393.         put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL);

  1394.         put_ebml_num(pb, side_data_size, 0);

  1395.         avio_write(pb, side_data, side_data_size);

  1396.         end_ebml_master(pb, block_more);

  1397.         end_ebml_master(pb, block_additions);

  1398.     }

  1399.     if ((side_data_size && additional_id == 1) || discard_padding) {

  1400.         end_ebml_master(pb, block_group);

  1401.     }

  1402. }

  1403. 

  1404. static int srt_get_duration(uint8_t **buf)

  1405. {

  1406.     int i, duration = 0;

  1407. 

  1408.     for (i=0; i<2 && !duration; i++) {

  1409.         int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;

  1410.         if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",

  1411.                    &s_hour, &s_min, &s_sec, &s_hsec,

  1412.                    &e_hour, &e_min, &e_sec, &e_hsec) == 8) {

  1413.             s_min  +=   60*s_hour;      e_min  +=   60*e_hour;

  1414.             s_sec  +=   60*s_min;       e_sec  +=   60*e_min;

  1415.             s_hsec += 1000*s_sec;       e_hsec += 1000*e_sec;

  1416.             duration = e_hsec - s_hsec;

  1417.         }

  1418.         *buf += ff_subtitles_next_line(*buf);

  1419.     }

  1420.     return duration;

  1421. }

  1422. 

  1423. static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  1424. {

  1425.     ebml_master blockgroup;

  1426.     AVPacket pkt2 = *pkt;

  1427.     int64_t duration = srt_get_duration(&pkt2.data);

  1428.     pkt2.size -= pkt2.data - pkt->data;

  1429. 

  1430.     blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,

  1431.                                    mkv_blockgroup_size(pkt2.size));

  1432.     mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);

  1433.     put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);

  1434.     end_ebml_master(pb, blockgroup);

  1435. 

  1436.     return duration;

  1437. }

  1438. 

  1439. static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)

  1440. {

  1441.     MatroskaMuxContext *mkv = s->priv_data;

  1442.     ebml_master blockgroup;

  1443.     int id_size, settings_size, size;

  1444.     uint8_t *id, *settings;

  1445.     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;

  1446.     const int flags = 0;

  1447. 

  1448.     id_size = 0;

  1449.     id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,

  1450.                                  &id_size);

  1451. 

  1452.     settings_size = 0;

  1453.     settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,

  1454.                                        &settings_size);

  1455. 

  1456.     size = id_size + 1 + settings_size + 1 + pkt->size;

  1457. 

  1458.     av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "

  1459.            "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",

  1460.            avio_tell(pb), size, pkt->pts, pkt->dts, pkt->duration, flags);

  1461. 

  1462.     blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));

  1463. 

  1464.     put_ebml_id(pb, MATROSKA_ID_BLOCK);

  1465.     put_ebml_num(pb, size+4, 0);

  1466.     avio_w8(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126

  1467.     avio_wb16(pb, ts - mkv->cluster_pts);

  1468.     avio_w8(pb, flags);

  1469.     avio_printf(pb, "%.*s\n%.*s\n%.*s", id_size, id, settings_size, settings, pkt->size, pkt->data);

  1470. 

  1471.     put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, pkt->duration);

  1472.     end_ebml_master(pb, blockgroup);

  1473. 

  1474.     return pkt->duration;

  1475. }

  1476. 

  1477. static void mkv_flush_dynbuf(AVFormatContext *s)

  1478. {

  1479.     MatroskaMuxContext *mkv = s->priv_data;

  1480.     int bufsize;

  1481.     uint8_t *dyn_buf;

  1482. 

  1483.     if (!mkv->dyn_bc)

  1484.         return;

  1485. 

  1486.     bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);

  1487.     avio_write(s->pb, dyn_buf, bufsize);

  1488.     av_free(dyn_buf);

  1489.     mkv->dyn_bc = NULL;

  1490. }

  1491. 

  1492. static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)

  1493. {

  1494.     MatroskaMuxContext *mkv = s->priv_data;

  1495.     AVIOContext *pb = s->pb;

  1496.     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;

  1497.     int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);

  1498.     int duration = pkt->duration;

  1499.     int ret;

  1500.     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;

  1501.     int64_t relative_packet_pos;

  1502. 

  1503.     if (ts == AV_NOPTS_VALUE) {

  1504.         av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");

  1505.         return AVERROR(EINVAL);

  1506.     }

  1507. 

  1508.     if (!s->pb->seekable) {

  1509.         if (!mkv->dyn_bc) {

  1510.             if ((ret = avio_open_dyn_buf(&mkv->dyn_bc)) < 0) {

  1511.                 av_log(s, AV_LOG_ERROR, "Failed to open dynamic buffer\n");

  1512.                 return ret;

  1513.             }

  1514.         }

  1515.         pb = mkv->dyn_bc;

  1516.     }

  1517. 

  1518.     if (mkv->cluster_pos == -1) {

  1519.         mkv->cluster_pos = avio_tell(s->pb);

  1520.         mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);

  1521.         put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));

  1522.         mkv->cluster_pts = FFMAX(0, ts);

  1523.     }

  1524. 

  1525.     relative_packet_pos = avio_tell(s->pb) - mkv->cluster.pos;

  1526. 

  1527.     if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {

  1528.         mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);

  1529. #if FF_API_ASS_SSA

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

  1531.         duration = mkv_write_ass_blocks(s, pb, pkt);

  1532. #endif

  1533.     } else if (codec->codec_id == AV_CODEC_ID_SRT) {

  1534.         duration = mkv_write_srt_blocks(s, pb, pkt);

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

  1536.         duration = mkv_write_vtt_blocks(s, pb, pkt);

  1537.     } else {

  1538.         ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));

  1539.         /* For backward compatibility, prefer convergence_duration. */

  1540.         if (pkt->convergence_duration > 0) {

  1541.             duration = pkt->convergence_duration;

  1542.         }

  1543.         mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);

  1544.         put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);

  1545.         end_ebml_master(pb, blockgroup);

  1546.     }

  1547. 

  1548.     if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) || codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {

  1549.         ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos, relative_packet_pos,

  1550.                                codec->codec_type == AVMEDIA_TYPE_SUBTITLE ? duration : -1);

  1551.         if (ret < 0) return ret;

  1552.     }

  1553. 

  1554.     mkv->duration = FFMAX(mkv->duration, ts + duration);

  1555.     return 0;

  1556. }

  1557. 

  1558. static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)

  1559. {

  1560.     MatroskaMuxContext *mkv = s->priv_data;

  1561.     int codec_type          = s->streams[pkt->stream_index]->codec->codec_type;

  1562.     int keyframe            = !!(pkt->flags & AV_PKT_FLAG_KEY);

  1563.     int cluster_size;

  1564.     int64_t cluster_time;

  1565.     AVIOContext *pb;

  1566.     int ret;

  1567. 

  1568.     if (mkv->tracks[pkt->stream_index].write_dts)

  1569.         cluster_time = pkt->dts - mkv->cluster_pts;

  1570.     else

  1571.         cluster_time = pkt->pts - mkv->cluster_pts;

  1572. 

  1573.     // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or

  1574.     // after 4k and on a keyframe

  1575.     if (s->pb->seekable) {

  1576.         pb = s->pb;

  1577.         cluster_size = avio_tell(pb) - mkv->cluster_pos;

  1578.     } else {

  1579.         pb = mkv->dyn_bc;

  1580.         cluster_size = avio_tell(pb);

  1581.     }

  1582. 

  1583.     if (mkv->cluster_pos != -1 &&

  1584.         (cluster_size > mkv->cluster_size_limit ||

  1585.          cluster_time > mkv->cluster_time_limit ||

  1586.          (codec_type == AVMEDIA_TYPE_VIDEO && keyframe &&

  1587.           cluster_size > 4 * 1024))) {

  1588.         av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64

  1589.                " bytes, pts %" PRIu64 "dts %" PRIu64 "\n",

  1590.                avio_tell(pb), pkt->pts, pkt->dts);

  1591.         end_ebml_master(pb, mkv->cluster);

  1592.         mkv->cluster_pos = -1;

  1593.         if (mkv->dyn_bc)

  1594.             mkv_flush_dynbuf(s);

  1595.         avio_flush(s->pb);

  1596.     }

  1597. 

  1598.     // check if we have an audio packet cached

  1599.     if (mkv->cur_audio_pkt.size > 0) {

  1600.         ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);

  1601.         av_free_packet(&mkv->cur_audio_pkt);

  1602.         if (ret < 0) {

  1603.             av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);

  1604.             return ret;

  1605.         }

  1606.     }

  1607. 

  1608.     // buffer an audio packet to ensure the packet containing the video

  1609.     // keyframe's timecode is contained in the same cluster for WebM

  1610.     if (codec_type == AVMEDIA_TYPE_AUDIO) {

  1611.         mkv->cur_audio_pkt = *pkt;

  1612.         if (pkt->buf) {

  1613.             mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);

  1614.             ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);

  1615.         } else

  1616.             ret = av_dup_packet(&mkv->cur_audio_pkt);

  1617.             if (mkv->cur_audio_pkt.side_data_elems > 0) {

  1618.                 ret = av_copy_packet_side_data(&mkv->cur_audio_pkt, &mkv->cur_audio_pkt);

  1619.             }

  1620.     } else

  1621.         ret = mkv_write_packet_internal(s, pkt);

  1622.     return ret;

  1623. }

  1624. 

  1625. static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)

  1626. {

  1627.     MatroskaMuxContext *mkv = s->priv_data;

  1628.     AVIOContext *pb;

  1629.     if (s->pb->seekable)

  1630.         pb = s->pb;

  1631.     else

  1632.         pb = mkv->dyn_bc;

  1633.     if (!pkt) {

  1634.         if (mkv->cluster_pos != -1) {

  1635.             av_log(s, AV_LOG_DEBUG, "Flushing cluster at offset %" PRIu64

  1636.                    " bytes\n", avio_tell(pb));

  1637.             end_ebml_master(pb, mkv->cluster);

  1638.             mkv->cluster_pos = -1;

  1639.             if (mkv->dyn_bc)

  1640.                 mkv_flush_dynbuf(s);

  1641.             avio_flush(s->pb);

  1642.         }

  1643.         return 0;

  1644.     }

  1645.     return mkv_write_packet(s, pkt);

  1646. }

  1647. 

  1648. static int mkv_write_trailer(AVFormatContext *s)

  1649. {

  1650.     MatroskaMuxContext *mkv = s->priv_data;

  1651.     AVIOContext *pb = s->pb;

  1652.     int64_t currentpos, cuespos;

  1653.     int ret;

  1654. 

  1655.     // check if we have an audio packet cached

  1656.     if (mkv->cur_audio_pkt.size > 0) {

  1657.         ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);

  1658.         av_free_packet(&mkv->cur_audio_pkt);

  1659.         if (ret < 0) {

  1660.             av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);

  1661.             return ret;

  1662.         }

  1663.     }

  1664. 

  1665.     if (mkv->dyn_bc) {

  1666.         end_ebml_master(mkv->dyn_bc, mkv->cluster);

  1667.         mkv_flush_dynbuf(s);

  1668.     } else if (mkv->cluster_pos != -1) {

  1669.         end_ebml_master(pb, mkv->cluster);

  1670.     }

  1671. 

  1672.     if (mkv->mode != MODE_WEBM) {

  1673.         ret = mkv_write_chapters(s);

  1674.         if (ret < 0) return ret;

  1675.     }

  1676. 

  1677.     if (pb->seekable) {

  1678.         if (mkv->cues->num_entries) {

  1679.             if (mkv->reserve_cues_space) {

  1680.                 int64_t cues_end;

  1681. 

  1682.                 currentpos = avio_tell(pb);

  1683.                 avio_seek(pb, mkv->cues_pos, SEEK_SET);

  1684. 

  1685.                 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);

  1686.                 cues_end = avio_tell(pb);

  1687.                 if (cues_end > cuespos + mkv->reserve_cues_space) {

  1688.                     av_log(s, AV_LOG_ERROR, "Insufficient space reserved for cues: %d "

  1689.                            "(needed: %"PRId64").\n", mkv->reserve_cues_space,

  1690.                            cues_end - cuespos);

  1691.                     return AVERROR(EINVAL);

  1692.                 }

  1693. 

  1694.                 if (cues_end < cuespos + mkv->reserve_cues_space)

  1695.                     put_ebml_void(pb, mkv->reserve_cues_space - (cues_end - cuespos));

  1696. 

  1697.                 avio_seek(pb, currentpos, SEEK_SET);

  1698.             } else {

  1699.                 cuespos = mkv_write_cues(pb, mkv->cues, mkv->tracks, s->nb_streams);

  1700.             }

  1701. 

  1702.             ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);

  1703.             if (ret < 0) return ret;

  1704.         }

  1705. 

  1706.         mkv_write_seekhead(pb, mkv->main_seekhead);

  1707. 

  1708.         // update the duration

  1709.         av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);

  1710.         currentpos = avio_tell(pb);

  1711.         avio_seek(pb, mkv->duration_offset, SEEK_SET);

  1712.         put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);

  1713. 

  1714.         avio_seek(pb, currentpos, SEEK_SET);

  1715.     }

  1716. 

  1717.     end_ebml_master(pb, mkv->segment);

  1718.     av_freep(&mkv->tracks);

  1719.     av_freep(&mkv->cues->entries);

  1720.     av_freep(&mkv->cues);

  1721. 

  1722.     return 0;

  1723. }

  1724. 

  1725. static int mkv_query_codec(enum AVCodecID codec_id, int std_compliance)

  1726. {

  1727.     int i;

  1728.     for (i = 0; ff_mkv_codec_tags[i].id != AV_CODEC_ID_NONE; i++)

  1729.         if (ff_mkv_codec_tags[i].id == codec_id)

  1730.             return 1;

  1731. 

  1732.     if (std_compliance < FF_COMPLIANCE_NORMAL) {                // mkv theoretically supports any

  1733.         enum AVMediaType type = avcodec_get_type(codec_id);     // video/audio through VFW/ACM

  1734.         if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO)

  1735.             return 1;

  1736.     }

  1737. 

  1738.     return 0;

  1739. }

  1740. 

  1741. static const AVCodecTag additional_audio_tags[] = {

  1742.     { AV_CODEC_ID_ALAC,      0XFFFFFFFF },

  1743.     { AV_CODEC_ID_EAC3,      0XFFFFFFFF },

  1744.     { AV_CODEC_ID_MLP,       0xFFFFFFFF },

  1745.     { AV_CODEC_ID_OPUS,      0xFFFFFFFF },

  1746.     { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },

  1747.     { AV_CODEC_ID_PCM_S24BE, 0xFFFFFFFF },

  1748.     { AV_CODEC_ID_PCM_S32BE, 0xFFFFFFFF },

  1749.     { AV_CODEC_ID_QDM2,      0xFFFFFFFF },

  1750.     { AV_CODEC_ID_RA_144,    0xFFFFFFFF },

  1751.     { AV_CODEC_ID_RA_288,    0xFFFFFFFF },

  1752.     { AV_CODEC_ID_COOK,      0xFFFFFFFF },

  1753.     { AV_CODEC_ID_TRUEHD,    0xFFFFFFFF },

  1754.     { AV_CODEC_ID_NONE,      0xFFFFFFFF }

  1755. };

  1756. 

  1757. static const AVCodecTag additional_video_tags[] = {

  1758.     { AV_CODEC_ID_RV10,      0xFFFFFFFF },

  1759.     { AV_CODEC_ID_RV20,      0xFFFFFFFF },

  1760.     { AV_CODEC_ID_RV30,      0xFFFFFFFF },

  1761.     { AV_CODEC_ID_RV40,      0xFFFFFFFF },

  1762.     { AV_CODEC_ID_VP9,       0xFFFFFFFF },

  1763.     { AV_CODEC_ID_NONE,      0xFFFFFFFF }

  1764. };

  1765. 

  1766. #define OFFSET(x) offsetof(MatroskaMuxContext, x)

  1767. #define FLAGS AV_OPT_FLAG_ENCODING_PARAM

  1768. static const AVOption options[] = {

  1769.     { "reserve_index_space", "Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).", OFFSET(reserve_cues_space), AV_OPT_TYPE_INT,   { .i64 = 0 },   0, INT_MAX,   FLAGS },

  1770.     { "cluster_size_limit",  "Store at most the provided amount of bytes in a cluster. ",                                     OFFSET(cluster_size_limit), AV_OPT_TYPE_INT  , { .i64 = -1 }, -1, INT_MAX,   FLAGS },

  1771.     { "cluster_time_limit",  "Store at most the provided number of milliseconds in a cluster.",                               OFFSET(cluster_time_limit), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS },

  1772.     { NULL },

  1773. };

  1774. 

  1775. #if CONFIG_MATROSKA_MUXER

  1776. static const AVClass matroska_class = {

  1777.     .class_name = "matroska muxer",

  1778.     .item_name  = av_default_item_name,

  1779.     .option     = options,

  1780.     .version    = LIBAVUTIL_VERSION_INT,

  1781. };

  1782. 

  1783. AVOutputFormat ff_matroska_muxer = {

  1784.     .name              = "matroska",

  1785.     .long_name         = NULL_IF_CONFIG_SMALL("Matroska"),

  1786.     .mime_type         = "video/x-matroska",

  1787.     .extensions        = "mkv",

  1788.     .priv_data_size    = sizeof(MatroskaMuxContext),

  1789.     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?

  1790.                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,

  1791.     .video_codec       = CONFIG_LIBX264_ENCODER ?

  1792.                          AV_CODEC_ID_H264 : AV_CODEC_ID_MPEG4,

  1793.     .write_header      = mkv_write_header,

  1794.     .write_packet      = mkv_write_flush_packet,

  1795.     .write_trailer     = mkv_write_trailer,

  1796.     .flags             = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |

  1797.                          AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,

  1798.     .codec_tag         = (const AVCodecTag* const []){

  1799.          ff_codec_bmp_tags, ff_codec_wav_tags,

  1800.          additional_audio_tags, additional_video_tags, 0

  1801.     },

  1802. #if FF_API_ASS_SSA

  1803.     .subtitle_codec    = AV_CODEC_ID_SSA,

  1804. #else

  1805.     .subtitle_codec    = AV_CODEC_ID_ASS,

  1806. #endif

  1807.     .query_codec       = mkv_query_codec,

  1808.     .priv_class        = &matroska_class,

  1809. };

  1810. #endif

  1811. 

  1812. #if CONFIG_WEBM_MUXER

  1813. static const AVClass webm_class = {

  1814.     .class_name = "webm muxer",

  1815.     .item_name  = av_default_item_name,

  1816.     .option     = options,

  1817.     .version    = LIBAVUTIL_VERSION_INT,

  1818. };

  1819. 

  1820. AVOutputFormat ff_webm_muxer = {

  1821.     .name              = "webm",

  1822.     .long_name         = NULL_IF_CONFIG_SMALL("WebM"),

  1823.     .mime_type         = "video/webm",

  1824.     .extensions        = "webm",

  1825.     .priv_data_size    = sizeof(MatroskaMuxContext),

  1826.     .audio_codec       = AV_CODEC_ID_VORBIS,

  1827.     .video_codec       = AV_CODEC_ID_VP8,

  1828.     .subtitle_codec    = AV_CODEC_ID_WEBVTT,

  1829.     .write_header      = mkv_write_header,

  1830.     .write_packet      = mkv_write_flush_packet,

  1831.     .write_trailer     = mkv_write_trailer,

  1832.     .flags             = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |

  1833.                          AVFMT_TS_NONSTRICT | AVFMT_ALLOW_FLUSH,

  1834.     .priv_class        = &webm_class,

  1835. };

  1836. #endif

  1837. 

  1838. #if CONFIG_MATROSKA_AUDIO_MUXER

  1839. static const AVClass mka_class = {

  1840.     .class_name = "matroska audio muxer",

  1841.     .item_name  = av_default_item_name,

  1842.     .option     = options,

  1843.     .version    = LIBAVUTIL_VERSION_INT,

  1844. };

  1845. AVOutputFormat ff_matroska_audio_muxer = {

  1846.     .name              = "matroska",

  1847.     .long_name         = NULL_IF_CONFIG_SMALL("Matroska Audio"),

  1848.     .mime_type         = "audio/x-matroska",

  1849.     .extensions        = "mka",

  1850.     .priv_data_size    = sizeof(MatroskaMuxContext),

  1851.     .audio_codec       = CONFIG_LIBVORBIS_ENCODER ?

  1852.                          AV_CODEC_ID_VORBIS : AV_CODEC_ID_AC3,

  1853.     .video_codec       = AV_CODEC_ID_NONE,

  1854.     .write_header      = mkv_write_header,

  1855.     .write_packet      = mkv_write_flush_packet,

  1856.     .write_trailer     = mkv_write_trailer,

  1857.     .flags             = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT |

  1858.                          AVFMT_ALLOW_FLUSH,

  1859.     .codec_tag         = (const AVCodecTag* const []){

  1860.         ff_codec_wav_tags, additional_audio_tags, 0

  1861.     },

  1862.     .priv_class        = &mka_class,

  1863. };

  1864. #endif