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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 "internal.h"

  39. #include "os_support.h"

  40. 

  41. #define KEYSIZE 16

  42. #define LINE_BUFFER_SIZE 1024

  43. 

  44. typedef struct HLSSegment {

  45.     char filename[1024];

  46.     char sub_filename[1024];

  47.     double duration; /* in seconds */

  48.     int64_t pos;

  49.     int64_t size;

  50. 

  51.     char key_uri[LINE_BUFFER_SIZE + 1];

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

  53. 

  54.     struct HLSSegment *next;

  55. } HLSSegment;

  56. 

  57. typedef enum HLSFlags {

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

  59.     HLS_SINGLE_FILE = (1 << 0),

  60.     HLS_DELETE_SEGMENTS = (1 << 1),

  61.     HLS_ROUND_DURATIONS = (1 << 2),

  62.     HLS_DISCONT_START = (1 << 3),

  63.     HLS_OMIT_ENDLIST = (1 << 4),

  64. } HLSFlags;

  65. 

  66. typedef struct HLSContext {

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

  68.     unsigned number;

  69.     int64_t sequence;

  70.     int64_t start_sequence;

  71.     AVOutputFormat *oformat;

  72.     AVOutputFormat *vtt_oformat;

  73. 

  74.     AVFormatContext *avf;

  75.     AVFormatContext *vtt_avf;

  76. 

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

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

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

  80.     uint32_t flags;        // enum HLSFlags

  81.     char *segment_filename;

  82. 

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

  84.     int allowcache;

  85.     int64_t recording_time;

  86.     int has_video;

  87.     int has_subtitle;

  88.     int64_t start_pts;

  89.     int64_t end_pts;

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

  91.     int64_t start_pos;    // last segment starting position

  92.     int64_t size;         // last segment size

  93.     int nb_entries;

  94.     int discontinuity_set;

  95. 

  96.     HLSSegment *segments;

  97.     HLSSegment *last_segment;

  98.     HLSSegment *old_segments;

  99. 

  100.     char *basename;

  101.     char *vtt_basename;

  102.     char *vtt_m3u8_name;

  103.     char *baseurl;

  104.     char *format_options_str;

  105.     char *vtt_format_options_str;

  106.     char *subtitle_filename;

  107.     AVDictionary *format_options;

  108. 

  109.     char *key_info_file;

  110.     char key_file[LINE_BUFFER_SIZE + 1];

  111.     char key_uri[LINE_BUFFER_SIZE + 1];

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

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

  114.     AVDictionary *vtt_format_options;

  115. 

  116.     char *method;

  117. 

  118. } HLSContext;

  119. 

  120. static int hls_delete_old_segments(HLSContext *hls) {

  121. 

  122.     HLSSegment *segment, *previous_segment = NULL;

  123.     float playlist_duration = 0.0f;

  124.     int ret = 0, path_size, sub_path_size;

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

  126.     char *path = NULL;

  127. 

  128.     segment = hls->segments;

  129.     while (segment) {

  130.         playlist_duration += segment->duration;

  131.         segment = segment->next;

  132.     }

  133. 

  134.     segment = hls->old_segments;

  135.     while (segment) {

  136.         playlist_duration -= segment->duration;

  137.         previous_segment = segment;

  138.         segment = previous_segment->next;

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

  140.             previous_segment->next = NULL;

  141.             break;

  142.         }

  143.     }

  144. 

  145.     if (segment) {

  146.         if (hls->segment_filename) {

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

  148.         } else {

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

  150.         }

  151.         if (!dirname) {

  152.             ret = AVERROR(ENOMEM);

  153.             goto fail;

  154.         }

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

  156.         *p = '\0';

  157.     }

  158. 

  159.     while (segment) {

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

  161.                                   segment->filename);

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

  163.         path = av_malloc(path_size);

  164.         if (!path) {

  165.             ret = AVERROR(ENOMEM);

  166.             goto fail;

  167.         }

  168. 

  169.         av_strlcpy(path, dirname, path_size);

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

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

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

  173.                                      path, strerror(errno));

  174.         }

  175. 

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

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

  178.             sub_path = av_malloc(sub_path_size);

  179.             if (!sub_path) {

  180.                 ret = AVERROR(ENOMEM);

  181.                 goto fail;

  182.             }

  183. 

  184.             av_strlcpy(sub_path, dirname, sub_path_size);

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

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

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

  188.                                          sub_path, strerror(errno));

  189.             }

  190.             av_free(sub_path);

  191.         }

  192.         av_freep(&path);

  193.         previous_segment = segment;

  194.         segment = previous_segment->next;

  195.         av_free(previous_segment);

  196.     }

  197. 

  198. fail:

  199.     av_free(path);

  200.     av_free(dirname);

  201. 

  202.     return ret;

  203. }

  204. 

  205. static int hls_encryption_start(AVFormatContext *s)

  206. {

  207.     HLSContext *hls = s->priv_data;

  208.     int ret;

  209.     AVIOContext *pb;

  210.     uint8_t key[KEYSIZE];

  211. 

  212.     if ((ret = avio_open2(&pb, hls->key_info_file, AVIO_FLAG_READ,

  213.                            &s->interrupt_callback, NULL)) < 0) {

  214.         av_log(hls, AV_LOG_ERROR,

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

  216.         return ret;

  217.     }

  218. 

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

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

  221. 

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

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

  224. 

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

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

  227. 

  228.     avio_close(pb);

  229. 

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

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

  232.         return AVERROR(EINVAL);

  233.     }

  234. 

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

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

  237.         return AVERROR(EINVAL);

  238.     }

  239. 

  240.     if ((ret = avio_open2(&pb, hls->key_file, AVIO_FLAG_READ,

  241.                            &s->interrupt_callback, NULL)) < 0) {

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

  243.         return ret;

  244.     }

  245. 

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

  247.     avio_close(pb);

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

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

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

  251.             ret = AVERROR(EINVAL);

  252.         return ret;

  253.     }

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

  255. 

  256.     return 0;

  257. }

  258. 

  259. static int hls_mux_init(AVFormatContext *s)

  260. {

  261.     HLSContext *hls = s->priv_data;

  262.     AVFormatContext *oc;

  263.     AVFormatContext *vtt_oc = NULL;

  264.     int i, ret;

  265. 

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

  267.     if (ret < 0)

  268.         return ret;

  269.     oc = hls->avf;

  270. 

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

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

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

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

  275. 

  276.     if(hls->vtt_oformat) {

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

  278.         if (ret < 0)

  279.             return ret;

  280.         vtt_oc          = hls->vtt_avf;

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

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

  283.     }

  284. 

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

  286.         AVStream *st;

  287.         AVFormatContext *loc;

  288.         if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)

  289.             loc = vtt_oc;

  290.         else

  291.             loc = oc;

  292. 

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

  294.             return AVERROR(ENOMEM);

  295.         avcodec_copy_context(st->codec, s->streams[i]->codec);

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

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

  298.     }

  299.     hls->start_pos = 0;

  300. 

  301.     return 0;

  302. }

  303. 

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

  305. static int hls_append_segment(HLSContext *hls, double duration, int64_t pos,

  306.                               int64_t size)

  307. {

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

  309.     int ret;

  310. 

  311.     if (!en)

  312.         return AVERROR(ENOMEM);

  313. 

  314.     av_strlcpy(en->filename, av_basename(hls->avf->filename), sizeof(en->filename));

  315. 

  316.     if(hls->has_subtitle)

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

  318.     else

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

  320. 

  321.     en->duration = duration;

  322.     en->pos      = pos;

  323.     en->size     = size;

  324.     en->next     = NULL;

  325. 

  326.     if (hls->key_info_file) {

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

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

  329.     }

  330. 

  331.     if (!hls->segments)

  332.         hls->segments = en;

  333.     else

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

  335. 

  336.     hls->last_segment = en;

  337. 

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

  339.         en = hls->segments;

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

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

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

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

  344.             hls->old_segments = en;

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

  346.                 return ret;

  347.         } else

  348.             av_free(en);

  349.     } else

  350.         hls->nb_entries++;

  351. 

  352.     hls->sequence++;

  353. 

  354.     return 0;

  355. }

  356. 

  357. static void hls_free_segments(HLSSegment *p)

  358. {

  359.     HLSSegment *en;

  360. 

  361.     while(p) {

  362.         en = p;

  363.         p = p->next;

  364.         av_free(en);

  365.     }

  366. }

  367. 

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

  369. {

  370.     if (c->method)

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

  372. }

  373. 

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

  375. {

  376.     HLSContext *hls = s->priv_data;

  377.     HLSSegment *en;

  378.     int target_duration = 0;

  379.     int ret = 0;

  380.     AVIOContext *out = NULL;

  381.     AVIOContext *sub_out = NULL;

  382.     char temp_filename[1024];

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

  384.     int version = hls->flags & HLS_SINGLE_FILE ? 4 : 3;

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

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

  387.     static unsigned warned_non_file;

  388.     char *key_uri = NULL;

  389.     char *iv_string = NULL;

  390.     AVDictionary *options = NULL;

  391. 

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

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

  394. 

  395.     set_http_options(&options, hls);

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

  397.     if ((ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,

  398.                           &s->interrupt_callback, &options)) < 0)

  399.         goto fail;

  400. 

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

  402.         if (target_duration < en->duration)

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

  404.     }

  405. 

  406.     hls->discontinuity_set = 0;

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

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

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

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

  411.     }

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

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

  414. 

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

  416.            sequence);

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

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

  419.         hls->discontinuity_set = 1;

  420.     }

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

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

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

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

  425.             if (*en->iv_string)

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

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

  428.             key_uri = en->key_uri;

  429.             iv_string = en->iv_string;

  430.         }

  431. 

  432.         if (hls->flags & HLS_ROUND_DURATIONS)

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

  434.         else

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

  436.         if (hls->flags & HLS_SINGLE_FILE)

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

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

  439.         if (hls->baseurl)

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

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

  442.     }

  443. 

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

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

  446. 

  447.     if( hls->vtt_m3u8_name ) {

  448.         if ((ret = avio_open2(&sub_out, hls->vtt_m3u8_name, AVIO_FLAG_WRITE,

  449.                           &s->interrupt_callback, &options)) < 0)

  450.             goto fail;

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

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

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

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

  455.         }

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

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

  458. 

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

  460.                sequence);

  461. 

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

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

  464.             if (hls->flags & HLS_SINGLE_FILE)

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

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

  467.             if (hls->baseurl)

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

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

  470.         }

  471. 

  472.         if (last)

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

  474. 

  475.     }

  476. 

  477. fail:

  478.     av_dict_free(&options);

  479.     avio_closep(&out);

  480.     avio_closep(&sub_out);

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

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

  483.     return ret;

  484. }

  485. 

  486. static int hls_start(AVFormatContext *s)

  487. {

  488.     HLSContext *c = s->priv_data;

  489.     AVFormatContext *oc = c->avf;

  490.     AVFormatContext *vtt_oc = c->vtt_avf;

  491.     AVDictionary *options = NULL;

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

  493.     int err = 0;

  494. 

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

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

  497.                    sizeof(oc->filename));

  498.         if (c->vtt_basename)

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

  500.                   sizeof(vtt_oc->filename));

  501.     } else {

  502.         if (c->use_localtime) {

  503.             time_t now0;

  504.             struct tm *tm, tmpbuf;

  505.             time(&now0);

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

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

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

  509.                 return AVERROR(EINVAL);

  510.             }

  511.        } else if (av_get_frame_filename(oc->filename, sizeof(oc->filename),

  512.                                   c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) {

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

  514.             return AVERROR(EINVAL);

  515.         }

  516.         if( c->vtt_basename) {

  517.             if (av_get_frame_filename(vtt_oc->filename, sizeof(vtt_oc->filename),

  518.                               c->vtt_basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) {

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

  520.                 return AVERROR(EINVAL);

  521.             }

  522.        }

  523.     }

  524.     c->number++;

  525. 

  526.     set_http_options(&options, c);

  527. 

  528.     if (c->key_info_file) {

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

  530.             goto fail;

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

  532.                 < 0)

  533.             goto fail;

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

  535.         if (!err)

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

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

  538.            goto fail;

  539. 

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

  541.         if (!filename) {

  542.             err = AVERROR(ENOMEM);

  543.             goto fail;

  544.         }

  545.         err = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,

  546.                          &s->interrupt_callback, &options);

  547.         av_free(filename);

  548.         av_dict_free(&options);

  549.         if (err < 0)

  550.             return err;

  551.     } else

  552.         if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,

  553.                           &s->interrupt_callback, &options)) < 0)

  554.             goto fail;

  555.     if (c->vtt_basename) {

  556.         set_http_options(&options, c);

  557.         if ((err = avio_open2(&vtt_oc->pb, vtt_oc->filename, AVIO_FLAG_WRITE,

  558.                          &s->interrupt_callback, &options)) < 0)

  559.             goto fail;

  560.     }

  561.     av_dict_free(&options);

  562. 

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

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

  565.         char period[21];

  566. 

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

  568. 

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

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

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

  572.     }

  573. 

  574.     if (c->vtt_basename) {

  575.         err = avformat_write_header(vtt_oc,NULL);

  576.         if (err < 0)

  577.             return err;

  578.     }

  579. 

  580.     return 0;

  581. fail:

  582.     av_dict_free(&options);

  583. 

  584.     return err;

  585. }

  586. 

  587. static int hls_write_header(AVFormatContext *s)

  588. {

  589.     HLSContext *hls = s->priv_data;

  590.     int ret, i;

  591.     char *p;

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

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

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

  595.     AVDictionary *options = NULL;

  596.     int basename_size;

  597.     int vtt_basename_size;

  598. 

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

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

  601.     hls->start_pts      = AV_NOPTS_VALUE;

  602. 

  603.     if (hls->format_options_str) {

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

  605.         if (ret < 0) {

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

  607.             goto fail;

  608.         }

  609.     }

  610. 

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

  612.         hls->has_video +=

  613.             s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;

  614.         hls->has_subtitle +=

  615.             s->streams[i]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE;

  616.     }

  617. 

  618.     if (hls->has_video > 1)

  619.         av_log(s, AV_LOG_WARNING,

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

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

  622. 

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

  624. 

  625.     if (!hls->oformat) {

  626.         ret = AVERROR_MUXER_NOT_FOUND;

  627.         goto fail;

  628.     }

  629. 

  630.     if(hls->has_subtitle) {

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

  632.         if (!hls->oformat) {

  633.             ret = AVERROR_MUXER_NOT_FOUND;

  634.             goto fail;

  635.         }

  636.     }

  637. 

  638.     if (hls->segment_filename) {

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

  640.         if (!hls->basename) {

  641.             ret = AVERROR(ENOMEM);

  642.             goto fail;

  643.         }

  644.     } else {

  645.         if (hls->flags & HLS_SINGLE_FILE)

  646.             pattern = ".ts";

  647. 

  648.         if (hls->use_localtime) {

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

  650.         } else {

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

  652.         }

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

  654.         if (!hls->basename) {

  655.             ret = AVERROR(ENOMEM);

  656.             goto fail;

  657.         }

  658. 

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

  660. 

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

  662.         if (p)

  663.             *p = '\0';

  664.         if (hls->use_localtime) {

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

  666.         } else {

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

  668.         }

  669.     }

  670. 

  671.     if(hls->has_subtitle) {

  672. 

  673.         if (hls->flags & HLS_SINGLE_FILE)

  674.             vtt_pattern = ".vtt";

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

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

  677.         if (!hls->vtt_basename) {

  678.             ret = AVERROR(ENOMEM);

  679.             goto fail;

  680.         }

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

  682.         if (!hls->vtt_m3u8_name ) {

  683.             ret = AVERROR(ENOMEM);

  684.             goto fail;

  685.         }

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

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

  688.         if (p)

  689.             *p = '\0';

  690. 

  691.         if( hls->subtitle_filename ) {

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

  693.         } else {

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

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

  696.         }

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

  698.     }

  699. 

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

  701.         goto fail;

  702. 

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

  704.         goto fail;

  705. 

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

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

  708.     if (av_dict_count(options)) {

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

  710.         ret = AVERROR(EINVAL);

  711.         goto fail;

  712.     }

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

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

  715.         AVStream *inner_st;

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

  717.         if (outer_st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)

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

  719.         else if (hls->vtt_avf)

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

  721.         else {

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

  723.             inner_st = NULL;

  724.             continue;

  725.         }

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

  727.     }

  728. fail:

  729. 

  730.     av_dict_free(&options);

  731.     if (ret < 0) {

  732.         av_freep(&hls->basename);

  733.         av_freep(&hls->vtt_basename);

  734.         if (hls->avf)

  735.             avformat_free_context(hls->avf);

  736.         if (hls->vtt_avf)

  737.             avformat_free_context(hls->vtt_avf);

  738. 

  739.     }

  740.     return ret;

  741. }

  742. 

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

  744. {

  745.     HLSContext *hls = s->priv_data;

  746.     AVFormatContext *oc = NULL;

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

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

  749.     int is_ref_pkt = 1;

  750.     int ret, can_split = 1;

  751.     int stream_index = 0;

  752. 

  753.     if( st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE ) {

  754.         oc = hls->vtt_avf;

  755.         stream_index = 0;

  756.     } else {

  757.         oc = hls->avf;

  758.         stream_index = pkt->stream_index;

  759.     }

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

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

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

  763.     }

  764. 

  765.     if (hls->has_video) {

  766.         can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

  767.                     pkt->flags & AV_PKT_FLAG_KEY;

  768.         is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;

  769.     }

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

  771.         is_ref_pkt = can_split = 0;

  772. 

  773.     if (is_ref_pkt)

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

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

  776. 

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

  778.                                    end_pts, AV_TIME_BASE_Q) >= 0) {

  779.         int64_t new_start_pos;

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

  781. 

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

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

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

  785.         hls->start_pos = new_start_pos;

  786.         if (ret < 0)

  787.             return ret;

  788. 

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

  790.         hls->duration = 0;

  791. 

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

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

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

  795.             hls->number++;

  796.         } else {

  797.             avio_closep(&oc->pb);

  798.             if (hls->vtt_avf)

  799.                 avio_close(hls->vtt_avf->pb);

  800. 

  801.             ret = hls_start(s);

  802.         }

  803. 

  804.         if (ret < 0)

  805.             return ret;

  806. 

  807.         if( st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE )

  808.             oc = hls->vtt_avf;

  809.         else

  810.         oc = hls->avf;

  811. 

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

  813.             return ret;

  814.     }

  815. 

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

  817. 

  818.     return ret;

  819. }

  820. 

  821. static int hls_write_trailer(struct AVFormatContext *s)

  822. {

  823.     HLSContext *hls = s->priv_data;

  824.     AVFormatContext *oc = hls->avf;

  825.     AVFormatContext *vtt_oc = hls->vtt_avf;

  826. 

  827.     av_write_trailer(oc);

  828.     if (oc->pb) {

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

  830.         avio_closep(&oc->pb);

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

  832.     }

  833. 

  834.     if (vtt_oc) {

  835.         if (vtt_oc->pb)

  836.             av_write_trailer(vtt_oc);

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

  838.         avio_closep(&vtt_oc->pb);

  839.     }

  840.     av_freep(&hls->basename);

  841.     avformat_free_context(oc);

  842. 

  843.     if (vtt_oc) {

  844.         av_freep(&hls->vtt_basename);

  845.         av_freep(&hls->vtt_m3u8_name);

  846.         avformat_free_context(vtt_oc);

  847.     }

  848. 

  849.     hls->avf = NULL;

  850.     hls_window(s, 1);

  851. 

  852.     hls_free_segments(hls->segments);

  853.     hls_free_segments(hls->old_segments);

  854.     return 0;

  855. }

  856. 

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

  858. #define E AV_OPT_FLAG_ENCODING_PARAM

  859. static const AVOption options[] = {

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

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

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

  863.     {"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},

  864.     {"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},

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

  866.     {"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},

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

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

  869.     {"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},

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

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

  872.     {"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"},

  873.     {"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"},

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

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

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

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

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

  879. 

  880.     { NULL },

  881. };

  882. 

  883. static const AVClass hls_class = {

  884.     .class_name = "hls muxer",

  885.     .item_name  = av_default_item_name,

  886.     .option     = options,

  887.     .version    = LIBAVUTIL_VERSION_INT,

  888. };

  889. 

  890. 

  891. AVOutputFormat ff_hls_muxer = {

  892.     .name           = "hls",

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

  894.     .extensions     = "m3u8",

  895.     .priv_data_size = sizeof(HLSContext),

  896.     .audio_codec    = AV_CODEC_ID_AAC,

  897.     .video_codec    = AV_CODEC_ID_H264,

  898.     .subtitle_codec = AV_CODEC_ID_WEBVTT,

  899.     .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,

  900.     .write_header   = hls_write_header,

  901.     .write_packet   = hls_write_packet,

  902.     .write_trailer  = hls_write_trailer,

  903.     .priv_class     = &hls_class,

  904. };