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FFmpeg/libavformat/hlsenc.c

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  1. /*

  2.  * Apple HTTP Live Streaming segmenter

  3.  * Copyright (c) 2012, Luca Barbato

  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 "config.h"

  23. #include <float.h>

  24. #include <stdint.h>

  25. #if HAVE_UNISTD_H

  26. #include <unistd.h>

  27. #endif

  28. 

  29. #include "libavutil/avassert.h"

  30. #include "libavutil/mathematics.h"

  31. #include "libavutil/parseutils.h"

  32. #include "libavutil/avstring.h"

  33. #include "libavutil/opt.h"

  34. #include "libavutil/log.h"

  35. #include "libavutil/time_internal.h"

  36. 

  37. #include "avformat.h"

  38. #include "avio_internal.h"

  39. #include "internal.h"

  40. #include "os_support.h"

  41. 

  42. #define KEYSIZE 16

  43. #define LINE_BUFFER_SIZE 1024

  44. 

  45. typedef struct HLSSegment {

  46.     char filename[1024];

  47.     char sub_filename[1024];

  48.     double duration; /* in seconds */

  49.     int64_t pos;

  50.     int64_t size;

  51. 

  52.     char key_uri[LINE_BUFFER_SIZE + 1];

  53.     char iv_string[KEYSIZE*2 + 1];

  54. 

  55.     struct HLSSegment *next;

  56. } HLSSegment;

  57. 

  58. typedef enum HLSFlags {

  59.     // Generate a single media file and use byte ranges in the playlist.

  60.     HLS_SINGLE_FILE = (1 << 0),

  61.     HLS_DELETE_SEGMENTS = (1 << 1),

  62.     HLS_ROUND_DURATIONS = (1 << 2),

  63.     HLS_DISCONT_START = (1 << 3),

  64.     HLS_OMIT_ENDLIST = (1 << 4),

  65.     HLS_SPLIT_BY_TIME = (1 << 5),

  66.     HLS_APPEND_LIST = (1 << 6),

  67.     HLS_PROGRAM_DATE_TIME = (1 << 7),

  68. } HLSFlags;

  69. 

  70. typedef enum {

  71.     PLAYLIST_TYPE_NONE,

  72.     PLAYLIST_TYPE_EVENT,

  73.     PLAYLIST_TYPE_VOD,

  74.     PLAYLIST_TYPE_NB,

  75. } PlaylistType;

  76. 

  77. typedef struct HLSContext {

  78.     const AVClass *class;  // Class for private options.

  79.     unsigned number;

  80.     int64_t sequence;

  81.     int64_t start_sequence;

  82.     AVOutputFormat *oformat;

  83.     AVOutputFormat *vtt_oformat;

  84. 

  85.     AVFormatContext *avf;

  86.     AVFormatContext *vtt_avf;

  87. 

  88.     float time;            // Set by a private option.

  89.     float init_time;       // Set by a private option.

  90.     int max_nb_segments;   // Set by a private option.

  91.     int  wrap;             // Set by a private option.

  92.     uint32_t flags;        // enum HLSFlags

  93.     uint32_t pl_type;      // enum PlaylistType

  94.     char *segment_filename;

  95. 

  96.     int use_localtime;      ///< flag to expand filename with localtime

  97.     int use_localtime_mkdir;///< flag to mkdir dirname in timebased filename

  98.     int allowcache;

  99.     int64_t recording_time;

  100.     int has_video;

  101.     int has_subtitle;

  102.     int64_t start_pts;

  103.     int64_t end_pts;

  104.     double duration;      // last segment duration computed so far, in seconds

  105.     int64_t start_pos;    // last segment starting position

  106.     int64_t size;         // last segment size

  107.     int64_t max_seg_size; // every segment file max size

  108.     int nb_entries;

  109.     int discontinuity_set;

  110. 

  111.     HLSSegment *segments;

  112.     HLSSegment *last_segment;

  113.     HLSSegment *old_segments;

  114. 

  115.     char *basename;

  116.     char *vtt_basename;

  117.     char *vtt_m3u8_name;

  118.     char *baseurl;

  119.     char *format_options_str;

  120.     char *vtt_format_options_str;

  121.     char *subtitle_filename;

  122.     AVDictionary *format_options;

  123. 

  124.     char *key_info_file;

  125.     char key_file[LINE_BUFFER_SIZE + 1];

  126.     char key_uri[LINE_BUFFER_SIZE + 1];

  127.     char key_string[KEYSIZE*2 + 1];

  128.     char iv_string[KEYSIZE*2 + 1];

  129.     AVDictionary *vtt_format_options;

  130. 

  131.     char *method;

  132. 

  133.     double initial_prog_date_time;

  134. } HLSContext;

  135. 

  136. static int mkdir_p(const char *path) {

  137.     int ret = 0;

  138.     char *temp = av_strdup(path);

  139.     char *pos = temp;

  140.     char tmp_ch = '\0';

  141. 

  142.     if (!path || !temp) {

  143.         return -1;

  144.     }

  145. 

  146.     if (!strncmp(temp, "/", 1) || !strncmp(temp, "\\", 1)) {

  147.         pos++;

  148.     } else if (!strncmp(temp, "./", 2) || !strncmp(temp, ".\\", 2)) {

  149.         pos += 2;

  150.     }

  151. 

  152.     for ( ; *pos != '\0'; ++pos) {

  153.         if (*pos == '/' || *pos == '\\') {

  154.             tmp_ch = *pos;

  155.             *pos = '\0';

  156.             ret = mkdir(temp, 0755);

  157.             *pos = tmp_ch;

  158.         }

  159.     }

  160. 

  161.     if ((*(pos - 1) != '/') || (*(pos - 1) != '\\')) {

  162.         ret = mkdir(temp, 0755);

  163.     }

  164. 

  165.     av_free(temp);

  166.     return ret;

  167. }

  168. 

  169. static int hls_delete_old_segments(HLSContext *hls) {

  170. 

  171.     HLSSegment *segment, *previous_segment = NULL;

  172.     float playlist_duration = 0.0f;

  173.     int ret = 0, path_size, sub_path_size;

  174.     char *dirname = NULL, *p, *sub_path;

  175.     char *path = NULL;

  176. 

  177.     segment = hls->segments;

  178.     while (segment) {

  179.         playlist_duration += segment->duration;

  180.         segment = segment->next;

  181.     }

  182. 

  183.     segment = hls->old_segments;

  184.     while (segment) {

  185.         playlist_duration -= segment->duration;

  186.         previous_segment = segment;

  187.         segment = previous_segment->next;

  188.         if (playlist_duration <= -previous_segment->duration) {

  189.             previous_segment->next = NULL;

  190.             break;

  191.         }

  192.     }

  193. 

  194.     if (segment) {

  195.         if (hls->segment_filename) {

  196.             dirname = av_strdup(hls->segment_filename);

  197.         } else {

  198.             dirname = av_strdup(hls->avf->filename);

  199.         }

  200.         if (!dirname) {

  201.             ret = AVERROR(ENOMEM);

  202.             goto fail;

  203.         }

  204.         p = (char *)av_basename(dirname);

  205.         *p = '\0';

  206.     }

  207. 

  208.     while (segment) {

  209.         av_log(hls, AV_LOG_DEBUG, "deleting old segment %s\n",

  210.                                   segment->filename);

  211.         path_size = strlen(dirname) + strlen(segment->filename) + 1;

  212.         path = av_malloc(path_size);

  213.         if (!path) {

  214.             ret = AVERROR(ENOMEM);

  215.             goto fail;

  216.         }

  217. 

  218.         av_strlcpy(path, dirname, path_size);

  219.         av_strlcat(path, segment->filename, path_size);

  220.         if (unlink(path) < 0) {

  221.             av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",

  222.                                      path, strerror(errno));

  223.         }

  224. 

  225.         if (segment->sub_filename[0] != '\0') {

  226.             sub_path_size = strlen(dirname) + strlen(segment->sub_filename) + 1;

  227.             sub_path = av_malloc(sub_path_size);

  228.             if (!sub_path) {

  229.                 ret = AVERROR(ENOMEM);

  230.                 goto fail;

  231.             }

  232. 

  233.             av_strlcpy(sub_path, dirname, sub_path_size);

  234.             av_strlcat(sub_path, segment->sub_filename, sub_path_size);

  235.             if (unlink(sub_path) < 0) {

  236.                 av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",

  237.                                          sub_path, strerror(errno));

  238.             }

  239.             av_free(sub_path);

  240.         }

  241.         av_freep(&path);

  242.         previous_segment = segment;

  243.         segment = previous_segment->next;

  244.         av_free(previous_segment);

  245.     }

  246. 

  247. fail:

  248.     av_free(path);

  249.     av_free(dirname);

  250. 

  251.     return ret;

  252. }

  253. 

  254. static int hls_encryption_start(AVFormatContext *s)

  255. {

  256.     HLSContext *hls = s->priv_data;

  257.     int ret;

  258.     AVIOContext *pb;

  259.     uint8_t key[KEYSIZE];

  260. 

  261.     if ((ret = s->io_open(s, &pb, hls->key_info_file, AVIO_FLAG_READ, NULL)) < 0) {

  262.         av_log(hls, AV_LOG_ERROR,

  263.                 "error opening key info file %s\n", hls->key_info_file);

  264.         return ret;

  265.     }

  266. 

  267.     ff_get_line(pb, hls->key_uri, sizeof(hls->key_uri));

  268.     hls->key_uri[strcspn(hls->key_uri, "\r\n")] = '\0';

  269. 

  270.     ff_get_line(pb, hls->key_file, sizeof(hls->key_file));

  271.     hls->key_file[strcspn(hls->key_file, "\r\n")] = '\0';

  272. 

  273.     ff_get_line(pb, hls->iv_string, sizeof(hls->iv_string));

  274.     hls->iv_string[strcspn(hls->iv_string, "\r\n")] = '\0';

  275. 

  276.     ff_format_io_close(s, &pb);

  277. 

  278.     if (!*hls->key_uri) {

  279.         av_log(hls, AV_LOG_ERROR, "no key URI specified in key info file\n");

  280.         return AVERROR(EINVAL);

  281.     }

  282. 

  283.     if (!*hls->key_file) {

  284.         av_log(hls, AV_LOG_ERROR, "no key file specified in key info file\n");

  285.         return AVERROR(EINVAL);

  286.     }

  287. 

  288.     if ((ret = s->io_open(s, &pb, hls->key_file, AVIO_FLAG_READ, NULL)) < 0) {

  289.         av_log(hls, AV_LOG_ERROR, "error opening key file %s\n", hls->key_file);

  290.         return ret;

  291.     }

  292. 

  293.     ret = avio_read(pb, key, sizeof(key));

  294.     ff_format_io_close(s, &pb);

  295.     if (ret != sizeof(key)) {

  296.         av_log(hls, AV_LOG_ERROR, "error reading key file %s\n", hls->key_file);

  297.         if (ret >= 0 || ret == AVERROR_EOF)

  298.             ret = AVERROR(EINVAL);

  299.         return ret;

  300.     }

  301.     ff_data_to_hex(hls->key_string, key, sizeof(key), 0);

  302. 

  303.     return 0;

  304. }

  305. 

  306. static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)

  307. {

  308.     int len = ff_get_line(s, buf, maxlen);

  309.     while (len > 0 && av_isspace(buf[len - 1]))

  310.         buf[--len] = '\0';

  311.     return len;

  312. }

  313. 

  314. static int hls_mux_init(AVFormatContext *s)

  315. {

  316.     HLSContext *hls = s->priv_data;

  317.     AVFormatContext *oc;

  318.     AVFormatContext *vtt_oc = NULL;

  319.     int i, ret;

  320. 

  321.     ret = avformat_alloc_output_context2(&hls->avf, hls->oformat, NULL, NULL);

  322.     if (ret < 0)

  323.         return ret;

  324.     oc = hls->avf;

  325. 

  326.     oc->oformat            = hls->oformat;

  327.     oc->interrupt_callback = s->interrupt_callback;

  328.     oc->max_delay          = s->max_delay;

  329.     oc->opaque             = s->opaque;

  330.     oc->io_open            = s->io_open;

  331.     oc->io_close           = s->io_close;

  332.     av_dict_copy(&oc->metadata, s->metadata, 0);

  333. 

  334.     if(hls->vtt_oformat) {

  335.         ret = avformat_alloc_output_context2(&hls->vtt_avf, hls->vtt_oformat, NULL, NULL);

  336.         if (ret < 0)

  337.             return ret;

  338.         vtt_oc          = hls->vtt_avf;

  339.         vtt_oc->oformat = hls->vtt_oformat;

  340.         av_dict_copy(&vtt_oc->metadata, s->metadata, 0);

  341.     }

  342. 

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

  344.         AVStream *st;

  345.         AVFormatContext *loc;

  346.         if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)

  347.             loc = vtt_oc;

  348.         else

  349.             loc = oc;

  350. 

  351.         if (!(st = avformat_new_stream(loc, NULL)))

  352.             return AVERROR(ENOMEM);

  353.         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);

  354.         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;

  355.         st->time_base = s->streams[i]->time_base;

  356.     }

  357.     hls->start_pos = 0;

  358. 

  359.     return 0;

  360. }

  361. 

  362. /* Create a new segment and append it to the segment list */

  363. static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double duration,

  364.                               int64_t pos, int64_t size)

  365. {

  366.     HLSSegment *en = av_malloc(sizeof(*en));

  367.     const char  *filename;

  368.     int ret;

  369. 

  370.     if (!en)

  371.         return AVERROR(ENOMEM);

  372. 

  373.     filename = av_basename(hls->avf->filename);

  374. 

  375.     if (hls->use_localtime_mkdir) {

  376.         filename = hls->avf->filename;

  377.     }

  378.     av_strlcpy(en->filename, filename, sizeof(en->filename));

  379. 

  380.     if(hls->has_subtitle)

  381.         av_strlcpy(en->sub_filename, av_basename(hls->vtt_avf->filename), sizeof(en->sub_filename));

  382.     else

  383.         en->sub_filename[0] = '\0';

  384. 

  385.     en->duration = duration;

  386.     en->pos      = pos;

  387.     en->size     = size;

  388.     en->next     = NULL;

  389. 

  390.     if (hls->key_info_file) {

  391.         av_strlcpy(en->key_uri, hls->key_uri, sizeof(en->key_uri));

  392.         av_strlcpy(en->iv_string, hls->iv_string, sizeof(en->iv_string));

  393.     }

  394. 

  395.     if (!hls->segments)

  396.         hls->segments = en;

  397.     else

  398.         hls->last_segment->next = en;

  399. 

  400.     hls->last_segment = en;

  401. 

  402.     // EVENT or VOD playlists imply sliding window cannot be used

  403.     if (hls->pl_type != PLAYLIST_TYPE_NONE)

  404.         hls->max_nb_segments = 0;

  405. 

  406.     if (hls->max_nb_segments && hls->nb_entries >= hls->max_nb_segments) {

  407.         en = hls->segments;

  408.         hls->segments = en->next;

  409.         if (en && hls->flags & HLS_DELETE_SEGMENTS &&

  410.                 !(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {

  411.             en->next = hls->old_segments;

  412.             hls->old_segments = en;

  413.             if ((ret = hls_delete_old_segments(hls)) < 0)

  414.                 return ret;

  415.         } else

  416.             av_free(en);

  417.     } else

  418.         hls->nb_entries++;

  419. 

  420.     if (hls->max_seg_size > 0) {

  421.         return 0;

  422.     }

  423.     hls->sequence++;

  424. 

  425.     return 0;

  426. }

  427. 

  428. static int parse_playlist(AVFormatContext *s, const char *url)

  429. {

  430.     HLSContext *hls = s->priv_data;

  431.     AVIOContext *in;

  432.     int ret = 0, is_segment = 0;

  433.     int64_t new_start_pos;

  434.     char line[1024];

  435.     const char *ptr;

  436. 

  437.     if ((ret = ffio_open_whitelist(&in, url, AVIO_FLAG_READ,

  438.                                    &s->interrupt_callback, NULL,

  439.                                    s->protocol_whitelist, s->protocol_blacklist)) < 0)

  440.         return ret;

  441. 

  442.     read_chomp_line(in, line, sizeof(line));

  443.     if (strcmp(line, "#EXTM3U")) {

  444.         ret = AVERROR_INVALIDDATA;

  445.         goto fail;

  446.     }

  447. 

  448.     while (!avio_feof(in)) {

  449.         read_chomp_line(in, line, sizeof(line));

  450.         if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {

  451.             hls->sequence = atoi(ptr);

  452.         } else if (av_strstart(line, "#EXTINF:", &ptr)) {

  453.             is_segment = 1;

  454.             hls->duration = atof(ptr);

  455.         } else if (av_strstart(line, "#", NULL)) {

  456.             continue;

  457.         } else if (line[0]) {

  458.             if (is_segment) {

  459.                 is_segment = 0;

  460.                 new_start_pos = avio_tell(hls->avf->pb);

  461.                 hls->size = new_start_pos - hls->start_pos;

  462.                 av_strlcpy(hls->avf->filename, line, sizeof(line));

  463.                 ret = hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);

  464.                 if (ret < 0)

  465.                     goto fail;

  466.                 hls->start_pos = new_start_pos;

  467.             }

  468.         }

  469.     }

  470. 

  471. fail:

  472.     avio_close(in);

  473.     return ret;

  474. }

  475. 

  476. static void hls_free_segments(HLSSegment *p)

  477. {

  478.     HLSSegment *en;

  479. 

  480.     while(p) {

  481.         en = p;

  482.         p = p->next;

  483.         av_free(en);

  484.     }

  485. }

  486. 

  487. static void set_http_options(AVDictionary **options, HLSContext *c)

  488. {

  489.     if (c->method)

  490.         av_dict_set(options, "method", c->method, 0);

  491. }

  492. 

  493. static int hls_window(AVFormatContext *s, int last)

  494. {

  495.     HLSContext *hls = s->priv_data;

  496.     HLSSegment *en;

  497.     int target_duration = 0;

  498.     int ret = 0;

  499.     AVIOContext *out = NULL;

  500.     AVIOContext *sub_out = NULL;

  501.     char temp_filename[1024];

  502.     int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries);

  503.     int version = 3;

  504.     const char *proto = avio_find_protocol_name(s->filename);

  505.     int use_rename = proto && !strcmp(proto, "file");

  506.     static unsigned warned_non_file;

  507.     char *key_uri = NULL;

  508.     char *iv_string = NULL;

  509.     AVDictionary *options = NULL;

  510.     double prog_date_time = hls->initial_prog_date_time;

  511.     int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);

  512. 

  513.     if (byterange_mode) {

  514.         version = 4;

  515.         sequence = 0;

  516.     }

  517. 

  518.     if (!use_rename && !warned_non_file++)

  519.         av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");

  520. 

  521.     set_http_options(&options, hls);

  522.     snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);

  523.     if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, &options)) < 0)

  524.         goto fail;

  525. 

  526.     for (en = hls->segments; en; en = en->next) {

  527.         if (target_duration < en->duration)

  528.             target_duration = ceil(en->duration);

  529.     }

  530. 

  531.     hls->discontinuity_set = 0;

  532.     avio_printf(out, "#EXTM3U\n");

  533.     avio_printf(out, "#EXT-X-VERSION:%d\n", version);

  534.     if (hls->allowcache == 0 || hls->allowcache == 1) {

  535.         avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");

  536.     }

  537.     avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);

  538.     avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);

  539.     if (hls->pl_type == PLAYLIST_TYPE_EVENT) {

  540.         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");

  541.     } else if (hls->pl_type == PLAYLIST_TYPE_VOD) {

  542.         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");

  543.     }

  544. 

  545.     av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",

  546.            sequence);

  547.     if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && hls->discontinuity_set==0 ){

  548.         avio_printf(out, "#EXT-X-DISCONTINUITY\n");

  549.         hls->discontinuity_set = 1;

  550.     }

  551.     for (en = hls->segments; en; en = en->next) {

  552.         if (hls->key_info_file && (!key_uri || strcmp(en->key_uri, key_uri) ||

  553.                                     av_strcasecmp(en->iv_string, iv_string))) {

  554.             avio_printf(out, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"", en->key_uri);

  555.             if (*en->iv_string)

  556.                 avio_printf(out, ",IV=0x%s", en->iv_string);

  557.             avio_printf(out, "\n");

  558.             key_uri = en->key_uri;

  559.             iv_string = en->iv_string;

  560.         }

  561. 

  562.         if (hls->flags & HLS_ROUND_DURATIONS)

  563.             avio_printf(out, "#EXTINF:%ld,\n",  lrint(en->duration));

  564.         else

  565.             avio_printf(out, "#EXTINF:%f,\n", en->duration);

  566.         if (byterange_mode)

  567.              avio_printf(out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",

  568.                          en->size, en->pos);

  569.         if (hls->flags & HLS_PROGRAM_DATE_TIME) {

  570.             time_t tt, wrongsecs;

  571.             int milli;

  572.             struct tm *tm, tmpbuf;

  573.             char buf0[128], buf1[128];

  574.             tt = (int64_t)prog_date_time;

  575.             milli = av_clip(lrint(1000*(prog_date_time - tt)), 0, 999);

  576.             tm = localtime_r(&tt, &tmpbuf);

  577.             strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm);

  578.             if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {

  579.                 int tz_min, dst = tm->tm_isdst;

  580.                 tm = gmtime_r(&tt, &tmpbuf);

  581.                 tm->tm_isdst = dst;

  582.                 wrongsecs = mktime(tm);

  583.                 tz_min = (abs(wrongsecs - tt) + 30) / 60;

  584.                 snprintf(buf1, sizeof(buf1),

  585.                          "%c%02d%02d",

  586.                          wrongsecs <= tt ? '+' : '-',

  587.                          tz_min / 60,

  588.                          tz_min % 60);

  589.             }

  590.             avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);

  591.             prog_date_time += en->duration;

  592.         }

  593.         if (hls->baseurl)

  594.             avio_printf(out, "%s", hls->baseurl);

  595.         avio_printf(out, "%s\n", en->filename);

  596.     }

  597. 

  598.     if (last && (hls->flags & HLS_OMIT_ENDLIST)==0)

  599.         avio_printf(out, "#EXT-X-ENDLIST\n");

  600. 

  601.     if( hls->vtt_m3u8_name ) {

  602.         if ((ret = s->io_open(s, &sub_out, hls->vtt_m3u8_name, AVIO_FLAG_WRITE, &options)) < 0)

  603.             goto fail;

  604.         avio_printf(sub_out, "#EXTM3U\n");

  605.         avio_printf(sub_out, "#EXT-X-VERSION:%d\n", version);

  606.         if (hls->allowcache == 0 || hls->allowcache == 1) {

  607.             avio_printf(sub_out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");

  608.         }

  609.         avio_printf(sub_out, "#EXT-X-TARGETDURATION:%d\n", target_duration);

  610.         avio_printf(sub_out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);

  611. 

  612.         av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",

  613.                sequence);

  614. 

  615.         for (en = hls->segments; en; en = en->next) {

  616.             avio_printf(sub_out, "#EXTINF:%f,\n", en->duration);

  617.             if (byterange_mode)

  618.                  avio_printf(sub_out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",

  619.                          en->size, en->pos);

  620.             if (hls->baseurl)

  621.                 avio_printf(sub_out, "%s", hls->baseurl);

  622.             avio_printf(sub_out, "%s\n", en->sub_filename);

  623.         }

  624. 

  625.         if (last)

  626.             avio_printf(sub_out, "#EXT-X-ENDLIST\n");

  627. 

  628.     }

  629. 

  630. fail:

  631.     av_dict_free(&options);

  632.     ff_format_io_close(s, &out);

  633.     ff_format_io_close(s, &sub_out);

  634.     if (ret >= 0 && use_rename)

  635.         ff_rename(temp_filename, s->filename, s);

  636.     return ret;

  637. }

  638. 

  639. static int hls_start(AVFormatContext *s)

  640. {

  641.     HLSContext *c = s->priv_data;

  642.     AVFormatContext *oc = c->avf;

  643.     AVFormatContext *vtt_oc = c->vtt_avf;

  644.     AVDictionary *options = NULL;

  645.     char *filename, iv_string[KEYSIZE*2 + 1];

  646.     int err = 0;

  647. 

  648.     if (c->flags & HLS_SINGLE_FILE) {

  649.         av_strlcpy(oc->filename, c->basename,

  650.                    sizeof(oc->filename));

  651.         if (c->vtt_basename)

  652.             av_strlcpy(vtt_oc->filename, c->vtt_basename,

  653.                   sizeof(vtt_oc->filename));

  654.     } else if (c->max_seg_size > 0) {

  655.         if (av_get_frame_filename2(oc->filename, sizeof(oc->filename),

  656.             c->basename, c->wrap ? c->sequence % c->wrap : c->sequence,

  657.             AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {

  658.                 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s', you can try to use -use_localtime 1 with it\n", c->basename);

  659.                 return AVERROR(EINVAL);

  660.         }

  661.     } else {

  662.         if (c->use_localtime) {

  663.             time_t now0;

  664.             struct tm *tm, tmpbuf;

  665.             time(&now0);

  666.             tm = localtime_r(&now0, &tmpbuf);

  667.             if (!strftime(oc->filename, sizeof(oc->filename), c->basename, tm)) {

  668.                 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with use_localtime\n");

  669.                 return AVERROR(EINVAL);

  670.             }

  671. 

  672.             if (c->use_localtime_mkdir) {

  673.                 const char *dir;

  674.                 char *fn_copy = av_strdup(oc->filename);

  675.                 if (!fn_copy) {

  676.                     return AVERROR(ENOMEM);

  677.                 }

  678.                 dir = av_dirname(fn_copy);

  679.                 if (mkdir_p(dir) == -1 && errno != EEXIST) {

  680.                     av_log(oc, AV_LOG_ERROR, "Could not create directory %s with use_localtime_mkdir\n", dir);

  681.                     av_free(fn_copy);

  682.                     return AVERROR(errno);

  683.                 }

  684.                 av_free(fn_copy);

  685.             }

  686.         } else if (av_get_frame_filename2(oc->filename, sizeof(oc->filename),

  687.                                   c->basename, c->wrap ? c->sequence % c->wrap : c->sequence,

  688.                                   AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {

  689.             av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s' you can try to use -use_localtime 1 with it\n", c->basename);

  690.             return AVERROR(EINVAL);

  691.         }

  692.         if( c->vtt_basename) {

  693.             if (av_get_frame_filename2(vtt_oc->filename, sizeof(vtt_oc->filename),

  694.                               c->vtt_basename, c->wrap ? c->sequence % c->wrap : c->sequence,

  695.                               AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {

  696.                 av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->vtt_basename);

  697.                 return AVERROR(EINVAL);

  698.             }

  699.        }

  700.     }

  701.     c->number++;

  702. 

  703.     set_http_options(&options, c);

  704. 

  705.     if (c->key_info_file) {

  706.         if ((err = hls_encryption_start(s)) < 0)

  707.             goto fail;

  708.         if ((err = av_dict_set(&options, "encryption_key", c->key_string, 0))

  709.                 < 0)

  710.             goto fail;

  711.         err = av_strlcpy(iv_string, c->iv_string, sizeof(iv_string));

  712.         if (!err)

  713.             snprintf(iv_string, sizeof(iv_string), "%032"PRIx64, c->sequence);

  714.         if ((err = av_dict_set(&options, "encryption_iv", iv_string, 0)) < 0)

  715.            goto fail;

  716. 

  717.         filename = av_asprintf("crypto:%s", oc->filename);

  718.         if (!filename) {

  719.             err = AVERROR(ENOMEM);

  720.             goto fail;

  721.         }

  722.         err = s->io_open(s, &oc->pb, filename, AVIO_FLAG_WRITE, &options);

  723.         av_free(filename);

  724.         av_dict_free(&options);

  725.         if (err < 0)

  726.             return err;

  727.     } else

  728.         if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, &options)) < 0)

  729.             goto fail;

  730.     if (c->vtt_basename) {

  731.         set_http_options(&options, c);

  732.         if ((err = s->io_open(s, &vtt_oc->pb, vtt_oc->filename, AVIO_FLAG_WRITE, &options)) < 0)

  733.             goto fail;

  734.     }

  735.     av_dict_free(&options);

  736. 

  737.     /* We only require one PAT/PMT per segment. */

  738.     if (oc->oformat->priv_class && oc->priv_data) {

  739.         char period[21];

  740. 

  741.         snprintf(period, sizeof(period), "%d", (INT_MAX / 2) - 1);

  742. 

  743.         av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);

  744.         av_opt_set(oc->priv_data, "sdt_period", period, 0);

  745.         av_opt_set(oc->priv_data, "pat_period", period, 0);

  746.     }

  747. 

  748.     if (c->vtt_basename) {

  749.         err = avformat_write_header(vtt_oc,NULL);

  750.         if (err < 0)

  751.             return err;

  752.     }

  753. 

  754.     return 0;

  755. fail:

  756.     av_dict_free(&options);

  757. 

  758.     return err;

  759. }

  760. 

  761. static int hls_write_header(AVFormatContext *s)

  762. {

  763.     HLSContext *hls = s->priv_data;

  764.     int ret, i;

  765.     char *p;

  766.     const char *pattern = "%d.ts";

  767.     const char *pattern_localtime_fmt = "-%s.ts";

  768.     const char *vtt_pattern = "%d.vtt";

  769.     AVDictionary *options = NULL;

  770.     int basename_size;

  771.     int vtt_basename_size;

  772. 

  773.     hls->sequence       = hls->start_sequence;

  774.     hls->recording_time = (hls->init_time ? hls->init_time : hls->time) * AV_TIME_BASE;

  775.     hls->start_pts      = AV_NOPTS_VALUE;

  776. 

  777.     if (hls->flags & HLS_PROGRAM_DATE_TIME) {

  778.         time_t now0;

  779.         time(&now0);

  780.         hls->initial_prog_date_time = now0;

  781.     }

  782. 

  783.     if (hls->format_options_str) {

  784.         ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);

  785.         if (ret < 0) {

  786.             av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n", hls->format_options_str);

  787.             goto fail;

  788.         }

  789.     }

  790. 

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

  792.         hls->has_video +=

  793.             s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;

  794.         hls->has_subtitle +=

  795.             s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE;

  796.     }

  797. 

  798.     if (hls->has_video > 1)

  799.         av_log(s, AV_LOG_WARNING,

  800.                "More than a single video stream present, "

  801.                "expect issues decoding it.\n");

  802. 

  803.     hls->oformat = av_guess_format("mpegts", NULL, NULL);

  804. 

  805.     if (!hls->oformat) {

  806.         ret = AVERROR_MUXER_NOT_FOUND;

  807.         goto fail;

  808.     }

  809. 

  810.     if(hls->has_subtitle) {

  811.         hls->vtt_oformat = av_guess_format("webvtt", NULL, NULL);

  812.         if (!hls->oformat) {

  813.             ret = AVERROR_MUXER_NOT_FOUND;

  814.             goto fail;

  815.         }

  816.     }

  817. 

  818.     if (hls->segment_filename) {

  819.         hls->basename = av_strdup(hls->segment_filename);

  820.         if (!hls->basename) {

  821.             ret = AVERROR(ENOMEM);

  822.             goto fail;

  823.         }

  824.     } else {

  825.         if (hls->flags & HLS_SINGLE_FILE)

  826.             pattern = ".ts";

  827. 

  828.         if (hls->use_localtime) {

  829.             basename_size = strlen(s->filename) + strlen(pattern_localtime_fmt) + 1;

  830.         } else {

  831.             basename_size = strlen(s->filename) + strlen(pattern) + 1;

  832.         }

  833.         hls->basename = av_malloc(basename_size);

  834.         if (!hls->basename) {

  835.             ret = AVERROR(ENOMEM);

  836.             goto fail;

  837.         }

  838. 

  839.         av_strlcpy(hls->basename, s->filename, basename_size);

  840. 

  841.         p = strrchr(hls->basename, '.');

  842.         if (p)

  843.             *p = '\0';

  844.         if (hls->use_localtime) {

  845.             av_strlcat(hls->basename, pattern_localtime_fmt, basename_size);

  846.         } else {

  847.             av_strlcat(hls->basename, pattern, basename_size);

  848.         }

  849.     }

  850. 

  851.     if(hls->has_subtitle) {

  852. 

  853.         if (hls->flags & HLS_SINGLE_FILE)

  854.             vtt_pattern = ".vtt";

  855.         vtt_basename_size = strlen(s->filename) + strlen(vtt_pattern) + 1;

  856.         hls->vtt_basename = av_malloc(vtt_basename_size);

  857.         if (!hls->vtt_basename) {

  858.             ret = AVERROR(ENOMEM);

  859.             goto fail;

  860.         }

  861.         hls->vtt_m3u8_name = av_malloc(vtt_basename_size);

  862.         if (!hls->vtt_m3u8_name ) {

  863.             ret = AVERROR(ENOMEM);

  864.             goto fail;

  865.         }

  866.         av_strlcpy(hls->vtt_basename, s->filename, vtt_basename_size);

  867.         p = strrchr(hls->vtt_basename, '.');

  868.         if (p)

  869.             *p = '\0';

  870. 

  871.         if( hls->subtitle_filename ) {

  872.             strcpy(hls->vtt_m3u8_name, hls->subtitle_filename);

  873.         } else {

  874.             strcpy(hls->vtt_m3u8_name, hls->vtt_basename);

  875.             av_strlcat(hls->vtt_m3u8_name, "_vtt.m3u8", vtt_basename_size);

  876.         }

  877.         av_strlcat(hls->vtt_basename, vtt_pattern, vtt_basename_size);

  878.     }

  879. 

  880.     if ((ret = hls_mux_init(s)) < 0)

  881.         goto fail;

  882. 

  883.     if (hls->flags & HLS_APPEND_LIST) {

  884.         parse_playlist(s, s->filename);

  885.         if (hls->init_time > 0) {

  886.             av_log(s, AV_LOG_WARNING, "append_list mode does not support hls_init_time,"

  887.                    " hls_init_time value will have no effect\n");

  888.             hls->init_time = 0;

  889.             hls->recording_time = hls->time * AV_TIME_BASE;

  890.         }

  891.     }

  892. 

  893.     if ((ret = hls_start(s)) < 0)

  894.         goto fail;

  895. 

  896.     av_dict_copy(&options, hls->format_options, 0);

  897.     ret = avformat_write_header(hls->avf, &options);

  898.     if (av_dict_count(options)) {

  899.         av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);

  900.         ret = AVERROR(EINVAL);

  901.         goto fail;

  902.     }

  903.     //av_assert0(s->nb_streams == hls->avf->nb_streams);

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

  905.         AVStream *inner_st;

  906.         AVStream *outer_st = s->streams[i];

  907. 

  908.         if (hls->max_seg_size > 0) {

  909.             if ((outer_st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&

  910.                 (outer_st->codecpar->bit_rate > hls->max_seg_size)) {

  911.                 av_log(s, AV_LOG_WARNING, "Your video bitrate is bigger than hls_segment_size, "

  912.                        "(%"PRId64 " > %"PRId64 "), the result maybe not be what you want.",

  913.                        outer_st->codecpar->bit_rate, hls->max_seg_size);

  914.             }

  915.         }

  916. 

  917.         if (outer_st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)

  918.             inner_st = hls->avf->streams[i];

  919.         else if (hls->vtt_avf)

  920.             inner_st = hls->vtt_avf->streams[0];

  921.         else {

  922.             /* We have a subtitle stream, when the user does not want one */

  923.             inner_st = NULL;

  924.             continue;

  925.         }

  926.         avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);

  927.     }

  928. fail:

  929. 

  930.     av_dict_free(&options);

  931.     if (ret < 0) {

  932.         av_freep(&hls->basename);

  933.         av_freep(&hls->vtt_basename);

  934.         if (hls->avf)

  935.             avformat_free_context(hls->avf);

  936.         if (hls->vtt_avf)

  937.             avformat_free_context(hls->vtt_avf);

  938. 

  939.     }

  940.     return ret;

  941. }

  942. 

  943. static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)

  944. {

  945.     HLSContext *hls = s->priv_data;

  946.     AVFormatContext *oc = NULL;

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

  948.     int64_t end_pts = hls->recording_time * hls->number;

  949.     int is_ref_pkt = 1;

  950.     int ret, can_split = 1;

  951.     int stream_index = 0;

  952. 

  953.     if (hls->sequence - hls->nb_entries > hls->start_sequence && hls->init_time > 0) {

  954.         /* reset end_pts, hls->recording_time at end of the init hls list */

  955.         int init_list_dur = hls->init_time * hls->nb_entries * AV_TIME_BASE;

  956.         int after_init_list_dur = (hls->sequence - hls->nb_entries ) * hls->time * AV_TIME_BASE;

  957.         hls->recording_time = hls->time * AV_TIME_BASE;

  958.         end_pts = init_list_dur + after_init_list_dur ;

  959.     }

  960. 

  961.     if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ) {

  962.         oc = hls->vtt_avf;

  963.         stream_index = 0;

  964.     } else {

  965.         oc = hls->avf;

  966.         stream_index = pkt->stream_index;

  967.     }

  968.     if (hls->start_pts == AV_NOPTS_VALUE) {

  969.         hls->start_pts = pkt->pts;

  970.         hls->end_pts   = pkt->pts;

  971.     }

  972. 

  973.     if (hls->has_video) {

  974.         can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&

  975.                     ((pkt->flags & AV_PKT_FLAG_KEY) || (hls->flags & HLS_SPLIT_BY_TIME));

  976.         is_ref_pkt = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;

  977.     }

  978.     if (pkt->pts == AV_NOPTS_VALUE)

  979.         is_ref_pkt = can_split = 0;

  980. 

  981.     if (is_ref_pkt)

  982.         hls->duration = (double)(pkt->pts - hls->end_pts)

  983.                                    * st->time_base.num / st->time_base.den;

  984. 

  985.     if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,

  986.                                    end_pts, AV_TIME_BASE_Q) >= 0) {

  987.         int64_t new_start_pos;

  988.         av_write_frame(oc, NULL); /* Flush any buffered data */

  989. 

  990.         new_start_pos = avio_tell(hls->avf->pb);

  991.         hls->size = new_start_pos - hls->start_pos;

  992.         ret = hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);

  993.         hls->start_pos = new_start_pos;

  994.         if (ret < 0)

  995.             return ret;

  996. 

  997.         hls->end_pts = pkt->pts;

  998.         hls->duration = 0;

  999. 

  1000.         if (hls->flags & HLS_SINGLE_FILE) {

  1001.             if (hls->avf->oformat->priv_class && hls->avf->priv_data)

  1002.                 av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);

  1003.             hls->number++;

  1004.         } else if (hls->max_seg_size > 0) {

  1005.             if (hls->avf->oformat->priv_class && hls->avf->priv_data)

  1006.                 av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);

  1007.             if (hls->start_pos >= hls->max_seg_size) {

  1008.                 hls->sequence++;

  1009.                 ff_format_io_close(s, &oc->pb);

  1010.                 if (hls->vtt_avf)

  1011.                     ff_format_io_close(s, &hls->vtt_avf->pb);

  1012.                 ret = hls_start(s);

  1013.                 hls->start_pos = 0;

  1014.                 /* When split segment by byte, the duration is short than hls_time,

  1015.                  * so it is not enough one segment duration as hls_time, */

  1016.                 hls->number--;

  1017.             }

  1018.             hls->number++;

  1019.         } else {

  1020.             ff_format_io_close(s, &oc->pb);

  1021.             if (hls->vtt_avf)

  1022.                 ff_format_io_close(s, &hls->vtt_avf->pb);

  1023. 

  1024.             ret = hls_start(s);

  1025.         }

  1026. 

  1027.         if (ret < 0)

  1028.             return ret;

  1029. 

  1030.         if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE )

  1031.             oc = hls->vtt_avf;

  1032.         else

  1033.         oc = hls->avf;

  1034. 

  1035.         if ((ret = hls_window(s, 0)) < 0)

  1036.             return ret;

  1037.     }

  1038. 

  1039.     ret = ff_write_chained(oc, stream_index, pkt, s, 0);

  1040. 

  1041.     return ret;

  1042. }

  1043. 

  1044. static int hls_write_trailer(struct AVFormatContext *s)

  1045. {

  1046.     HLSContext *hls = s->priv_data;

  1047.     AVFormatContext *oc = hls->avf;

  1048.     AVFormatContext *vtt_oc = hls->vtt_avf;

  1049. 

  1050.     av_write_trailer(oc);

  1051.     if (oc->pb) {

  1052.         hls->size = avio_tell(hls->avf->pb) - hls->start_pos;

  1053.         ff_format_io_close(s, &oc->pb);

  1054.         hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);

  1055.     }

  1056. 

  1057.     if (vtt_oc) {

  1058.         if (vtt_oc->pb)

  1059.             av_write_trailer(vtt_oc);

  1060.         hls->size = avio_tell(hls->vtt_avf->pb) - hls->start_pos;

  1061.         ff_format_io_close(s, &vtt_oc->pb);

  1062.     }

  1063.     av_freep(&hls->basename);

  1064.     avformat_free_context(oc);

  1065. 

  1066.     hls->avf = NULL;

  1067.     hls_window(s, 1);

  1068. 

  1069.     if (vtt_oc) {

  1070.         av_freep(&hls->vtt_basename);

  1071.         av_freep(&hls->vtt_m3u8_name);

  1072.         avformat_free_context(vtt_oc);

  1073.     }

  1074. 

  1075.     hls_free_segments(hls->segments);

  1076.     hls_free_segments(hls->old_segments);

  1077.     return 0;

  1078. }

  1079. 

  1080. #define OFFSET(x) offsetof(HLSContext, x)

  1081. #define E AV_OPT_FLAG_ENCODING_PARAM

  1082. static const AVOption options[] = {

  1083.     {"start_number",  "set first number in the sequence",        OFFSET(start_sequence),AV_OPT_TYPE_INT64,  {.i64 = 0},     0, INT64_MAX, E},

  1084.     {"hls_time",      "set segment length in seconds",           OFFSET(time),    AV_OPT_TYPE_FLOAT,  {.dbl = 2},     0, FLT_MAX, E},

  1085.     {"hls_init_time", "set segment length in seconds at init list",           OFFSET(init_time),    AV_OPT_TYPE_FLOAT,  {.dbl = 0},     0, FLT_MAX, E},

  1086.     {"hls_list_size", "set maximum number of playlist entries",  OFFSET(max_nb_segments),    AV_OPT_TYPE_INT,    {.i64 = 5},     0, INT_MAX, E},

  1087.     {"hls_ts_options","set hls mpegts list of options for the container format used for hls", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},

  1088.     {"hls_vtt_options","set hls vtt list of options for the container format used for hls", OFFSET(vtt_format_options_str), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},

  1089.     {"hls_wrap",      "set number after which the index wraps",  OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},

  1090.     {"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},

  1091.     {"hls_base_url",  "url to prepend to each playlist entry",   OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E},

  1092.     {"hls_segment_filename", "filename template for segment files", OFFSET(segment_filename),   AV_OPT_TYPE_STRING, {.str = NULL},            0,       0,         E},

  1093.     {"hls_segment_size", "maximum size per segment file, (in bytes)",  OFFSET(max_seg_size),    AV_OPT_TYPE_INT,    {.i64 = 0},               0,       INT_MAX,   E},

  1094.     {"hls_key_info_file",    "file with key URI and key file path", OFFSET(key_info_file),      AV_OPT_TYPE_STRING, {.str = NULL},            0,       0,         E},

  1095.     {"hls_subtitle_path",     "set path of hls subtitles", OFFSET(subtitle_filename), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},

  1096.     {"hls_flags",     "set flags affecting HLS playlist and media file generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E, "flags"},

  1097.     {"single_file",   "generate a single media file indexed with byte ranges", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SINGLE_FILE }, 0, UINT_MAX,   E, "flags"},

  1098.     {"delete_segments", "delete segment files that are no longer part of the playlist", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DELETE_SEGMENTS }, 0, UINT_MAX,   E, "flags"},

  1099.     {"round_durations", "round durations in m3u8 to whole numbers", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_ROUND_DURATIONS }, 0, UINT_MAX,   E, "flags"},

  1100.     {"discont_start", "start the playlist with a discontinuity tag", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DISCONT_START }, 0, UINT_MAX,   E, "flags"},

  1101.     {"omit_endlist", "Do not append an endlist when ending stream", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_OMIT_ENDLIST }, 0, UINT_MAX,   E, "flags"},

  1102.     {"split_by_time", "split the hls segment by time which user set by hls_time", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SPLIT_BY_TIME }, 0, UINT_MAX,   E, "flags"},

  1103.     {"append_list", "append the new segments into old hls segment list", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_APPEND_LIST }, 0, UINT_MAX,   E, "flags"},

  1104.     {"program_date_time", "add EXT-X-PROGRAM-DATE-TIME", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_PROGRAM_DATE_TIME }, 0, UINT_MAX,   E, "flags"},

  1105.     {"use_localtime", "set filename expansion with strftime at segment creation", OFFSET(use_localtime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },

  1106.     {"use_localtime_mkdir", "create last directory component in strftime-generated filename", OFFSET(use_localtime_mkdir), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },

  1107.     {"hls_playlist_type", "set the HLS playlist type", OFFSET(pl_type), AV_OPT_TYPE_INT, {.i64 = PLAYLIST_TYPE_NONE }, 0, PLAYLIST_TYPE_NB-1, E, "pl_type" },

  1108.     {"event", "EVENT playlist", 0, AV_OPT_TYPE_CONST, {.i64 = PLAYLIST_TYPE_EVENT }, INT_MIN, INT_MAX, E, "pl_type" },

  1109.     {"vod", "VOD playlist", 0, AV_OPT_TYPE_CONST, {.i64 = PLAYLIST_TYPE_VOD }, INT_MIN, INT_MAX, E, "pl_type" },

  1110.     {"method", "set the HTTP method", OFFSET(method), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},

  1111. 

  1112.     { NULL },

  1113. };

  1114. 

  1115. static const AVClass hls_class = {

  1116.     .class_name = "hls muxer",

  1117.     .item_name  = av_default_item_name,

  1118.     .option     = options,

  1119.     .version    = LIBAVUTIL_VERSION_INT,

  1120. };

  1121. 

  1122. 

  1123. AVOutputFormat ff_hls_muxer = {

  1124.     .name           = "hls",

  1125.     .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),

  1126.     .extensions     = "m3u8",

  1127.     .priv_data_size = sizeof(HLSContext),

  1128.     .audio_codec    = AV_CODEC_ID_AAC,

  1129.     .video_codec    = AV_CODEC_ID_H264,

  1130.     .subtitle_codec = AV_CODEC_ID_WEBVTT,

  1131.     .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,

  1132.     .write_header   = hls_write_header,

  1133.     .write_packet   = hls_write_packet,

  1134.     .write_trailer  = hls_write_trailer,

  1135.     .priv_class     = &hls_class,

  1136. };