git.sesse.net Git - ffmpeg/blob - libavformat/hlsplaylist.c

   1 /*
   2  * Apple HTTP Live Streaming segmenter
   3  * Copyright (c) 2012, Luca Barbato
   4  * Copyright (c) 2017 Akamai Technologies, Inc.
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24 #include <stdint.h>
  25
  26 #include "libavutil/time_internal.h"
  27
  28 #include "avformat.h"
  29 #include "hlsplaylist.h"
  30
  31 void ff_hls_write_playlist_version(AVIOContext *out, int version) {
  32     if (!out)
  33         return;
  34     avio_printf(out, "#EXTM3U\n");
  35     avio_printf(out, "#EXT-X-VERSION:%d\n", version);
  36 }
  37
  38 void ff_hls_write_audio_rendition(AVIOContext *out, char *agroup,
  39                                   char *filename, char *language, int name_id, int is_default) {
  40     if (!out || !agroup || !filename)
  41         return;
  42
  43     avio_printf(out, "#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=\"group_%s\"", agroup);
  44     avio_printf(out, ",NAME=\"audio_%d\",DEFAULT=%s,", name_id, is_default ? "YES" : "NO");
  45     if (language) {
  46         avio_printf(out, "LANGUAGE=\"%s\",", language);
  47     }
  48     avio_printf(out, "URI=\"%s\"\n", filename);
  49 }
  50
  51 void ff_hls_write_stream_info(AVStream *st, AVIOContext *out,
  52                               int bandwidth, char *filename, char *agroup,
  53                               char *codecs, char *ccgroup) {
  54
  55     if (!out || !filename)
  56         return;
  57
  58     if (!bandwidth) {
  59         av_log(NULL, AV_LOG_WARNING,
  60                 "Bandwidth info not available, set audio and video bitrates\n");
  61         return;
  62     }
  63
  64     avio_printf(out, "#EXT-X-STREAM-INF:BANDWIDTH=%d", bandwidth);
  65     if (st && st->codecpar->width > 0 && st->codecpar->height > 0)
  66         avio_printf(out, ",RESOLUTION=%dx%d", st->codecpar->width,
  67                 st->codecpar->height);
  68     if (codecs && strlen(codecs) > 0)
  69         avio_printf(out, ",CODECS=\"%s\"", codecs);
  70     if (agroup && strlen(agroup) > 0)
  71         avio_printf(out, ",AUDIO=\"group_%s\"", agroup);
  72     if (ccgroup && strlen(ccgroup) > 0)
  73         avio_printf(out, ",CLOSED-CAPTIONS=\"%s\"", ccgroup);
  74     avio_printf(out, "\n%s\n\n", filename);
  75 }
  76
  77 void ff_hls_write_playlist_header(AVIOContext *out, int version, int allowcache,
  78                                   int target_duration, int64_t sequence,
  79                                   uint32_t playlist_type) {
  80     if (!out)
  81         return;
  82     ff_hls_write_playlist_version(out, version);
  83     if (allowcache == 0 || allowcache == 1) {
  84         avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", allowcache == 0 ? "NO" : "YES");
  85     }
  86     avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
  87     avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
  88     av_log(NULL, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
  89
  90     if (playlist_type == PLAYLIST_TYPE_EVENT) {
  91         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
  92     } else if (playlist_type == PLAYLIST_TYPE_VOD) {
  93         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
  94     }
  95 }
  96
  97 void ff_hls_write_init_file(AVIOContext *out, char *filename,
  98                             int byterange_mode, int64_t size, int64_t pos) {
  99     avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", filename);
 100     if (byterange_mode) {
 101         avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", size, pos);
 102     }
 103     avio_printf(out, "\n");
 104 }
 105
 106 int ff_hls_write_file_entry(AVIOContext *out, int insert_discont,
 107                              int byterange_mode,
 108                              double duration, int round_duration,
 109                              int64_t size, int64_t pos, //Used only if HLS_SINGLE_FILE flag is set
 110                              char *baseurl, //Ignored if NULL
 111                              char *filename, double *prog_date_time) {
 112     if (!out || !filename)
 113         return AVERROR(EINVAL);
 114
 115     if (insert_discont) {
 116         avio_printf(out, "#EXT-X-DISCONTINUITY\n");
 117     }
 118     if (round_duration)
 119         avio_printf(out, "#EXTINF:%ld,\n",  lrint(duration));
 120     else
 121         avio_printf(out, "#EXTINF:%f,\n", duration);
 122     if (byterange_mode)
 123         avio_printf(out, "#EXT-X-BYTERANGE:%"PRId64"@%"PRId64"\n", size, pos);
 124
 125     if (prog_date_time) {
 126         time_t tt, wrongsecs;
 127         int milli;
 128         struct tm *tm, tmpbuf;
 129         char buf0[128], buf1[128];
 130         tt = (int64_t)*prog_date_time;
 131         milli = av_clip(lrint(1000*(*prog_date_time - tt)), 0, 999);
 132         tm = localtime_r(&tt, &tmpbuf);
 133         if (!strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm)) {
 134             av_log(NULL, AV_LOG_DEBUG, "strftime error in ff_hls_write_file_entry\n");
 135             return AVERROR_UNKNOWN;
 136         }
 137         if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
 138             int tz_min, dst = tm->tm_isdst;
 139             tm = gmtime_r(&tt, &tmpbuf);
 140             tm->tm_isdst = dst;
 141             wrongsecs = mktime(tm);
 142             tz_min = (FFABS(wrongsecs - tt) + 30) / 60;
 143             snprintf(buf1, sizeof(buf1),
 144                      "%c%02d%02d",
 145                      wrongsecs <= tt ? '+' : '-',
 146                      tz_min / 60,
 147                      tz_min % 60);
 148         }
 149         avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
 150         *prog_date_time += duration;
 151     }
 152     if (baseurl)
 153         avio_printf(out, "%s", baseurl);
 154     avio_printf(out, "%s\n", filename);
 155
 156     return 0;
 157 }
 158
 159 void ff_hls_write_end_list (AVIOContext *out) {
 160     if (!out)
 161         return;
 162     avio_printf(out, "#EXT-X-ENDLIST\n");
 163 }
 164