/*
  * Apple HTTP Live Streaming segmenter
  * Copyright (c) 2012, Luca Barbato
  * Copyright (c) 2017 Akamai Technologies, Inc.
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "config.h"
 #include <stdint.h>
 
 #include "libavutil/time_internal.h"
 
 #include "avformat.h"
 #include "hlsplaylist.h"
 
 void ff_hls_write_playlist_version(AVIOContext *out, int version) {
     if (!out)
         return;
     avio_printf(out, "#EXTM3U\n");
     avio_printf(out, "#EXT-X-VERSION:%d\n", version);
 }
 
 void ff_hls_write_stream_info(AVStream *st, AVIOContext *out,
                               int bandwidth, char *filename) {
     if (!out || !filename)
         return;
 
     if (!bandwidth) {
         av_log(NULL, AV_LOG_WARNING,
                 "Bandwidth info not available, set audio and video bitrates\n");
         return;
     }
 
     avio_printf(out, "#EXT-X-STREAM-INF:BANDWIDTH=%d", bandwidth);
     if (st && st->codecpar->width > 0 && st->codecpar->height > 0)
         avio_printf(out, ",RESOLUTION=%dx%d", st->codecpar->width,
                 st->codecpar->height);
     avio_printf(out, "\n%s\n\n", filename);
 }
 
 void ff_hls_write_playlist_header(AVIOContext *out, int version, int allowcache,
                                   int target_duration, int64_t sequence,
                                   uint32_t playlist_type) {
     if (!out)
         return;
     ff_hls_write_playlist_version(out, version);
     if (allowcache == 0 || allowcache == 1) {
         avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", allowcache == 0 ? "NO" : "YES");
     }
     avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
     avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
     av_log(NULL, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
 
     if (playlist_type == PLAYLIST_TYPE_EVENT) {
         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
     } else if (playlist_type == PLAYLIST_TYPE_VOD) {
         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
     }
 }
 
 void ff_hls_write_init_file(AVIOContext *out, char *filename,
                             int byterange_mode, int64_t size, int64_t pos) {
     avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", filename);
     if (byterange_mode) {
         avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", size, pos);
     }
     avio_printf(out, "\n");
 }
 
 void ff_hls_write_file_entry(AVIOContext *out, int insert_discont,
                              int byterange_mode,
                              double duration, int round_duration,
                              int64_t size, int64_t pos, //Used only if HLS_SINGLE_FILE flag is set
                              char *baseurl, //Ignored if NULL
                              char *filename, double *prog_date_time) {
     if (!out || !filename)
         return;
 
     if (insert_discont) {
         avio_printf(out, "#EXT-X-DISCONTINUITY\n");
     }
     if (round_duration)
         avio_printf(out, "#EXTINF:%ld,\n",  lrint(duration));
     else
         avio_printf(out, "#EXTINF:%f,\n", duration);
     if (byterange_mode)
         avio_printf(out, "#EXT-X-BYTERANGE:%"PRId64"@%"PRId64"\n", size, pos);
 
     if (prog_date_time) {
         time_t tt, wrongsecs;
         int milli;
         struct tm *tm, tmpbuf;
         char buf0[128], buf1[128];
         tt = (int64_t)*prog_date_time;
         milli = av_clip(lrint(1000*(*prog_date_time - tt)), 0, 999);
         tm = localtime_r(&tt, &tmpbuf);
         strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm);
         if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
             int tz_min, dst = tm->tm_isdst;
             tm = gmtime_r(&tt, &tmpbuf);
             tm->tm_isdst = dst;
             wrongsecs = mktime(tm);
             tz_min = (FFABS(wrongsecs - tt) + 30) / 60;
             snprintf(buf1, sizeof(buf1),
                      "%c%02d%02d",
                      wrongsecs <= tt ? '+' : '-',
                      tz_min / 60,
                      tz_min % 60);
         }
         avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
         *prog_date_time += duration;
     }
     if (baseurl)
         avio_printf(out, "%s", baseurl);
     avio_printf(out, "%s\n", filename);
 }
 
 void ff_hls_write_end_list (AVIOContext *out) {
     if (!out)
         return;
     avio_printf(out, "#EXT-X-ENDLIST\n");
 }