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[ffmpeg] / 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 {
33     if (!out)
34         return;
35     avio_printf(out, "#EXTM3U\n");
36     avio_printf(out, "#EXT-X-VERSION:%d\n", version);
37 }
38
39 void ff_hls_write_audio_rendition(AVIOContext *out, const char *agroup,
40                                   const char *filename, const char *language,
41                                   int name_id, int is_default)
42 {
43     if (!out || !agroup || !filename)
44         return;
45
46     avio_printf(out, "#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=\"group_%s\"", agroup);
47     avio_printf(out, ",NAME=\"audio_%d\",DEFAULT=%s,", name_id, is_default ? "YES" : "NO");
48     if (language) {
49         avio_printf(out, "LANGUAGE=\"%s\",", language);
50     }
51     avio_printf(out, "URI=\"%s\"\n", filename);
52 }
53
54 void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup,
55                                      const char *filename, const char *language,
56                                      int name_id, int is_default)
57 {
58     if (!out || !filename)
59         return;
60
61     avio_printf(out, "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"%s\"", sgroup);
62     avio_printf(out, ",NAME=\"subtitle_%d\",DEFAULT=%s,", name_id, is_default ? "YES" : "NO");
63     if (language) {
64         avio_printf(out, "LANGUAGE=\"%s\",", language);
65     }
66     avio_printf(out, "URI=\"%s\"\n", filename);
67 }
68
69 void ff_hls_write_stream_info(AVStream *st, AVIOContext *out, int bandwidth,
70                               const char *filename, const char *agroup,
71                               const char *codecs, const char *ccgroup,
72                               const char *sgroup)
73 {
74     if (!out || !filename)
75         return;
76
77     if (!bandwidth) {
78         av_log(NULL, AV_LOG_WARNING,
79                 "Bandwidth info not available, set audio and video bitrates\n");
80         return;
81     }
82
83     avio_printf(out, "#EXT-X-STREAM-INF:BANDWIDTH=%d", bandwidth);
84     if (st && st->codecpar->width > 0 && st->codecpar->height > 0)
85         avio_printf(out, ",RESOLUTION=%dx%d", st->codecpar->width,
86                 st->codecpar->height);
87     if (codecs && codecs[0])
88         avio_printf(out, ",CODECS=\"%s\"", codecs);
89     if (agroup && agroup[0])
90         avio_printf(out, ",AUDIO=\"group_%s\"", agroup);
91     if (ccgroup && ccgroup[0])
92         avio_printf(out, ",CLOSED-CAPTIONS=\"%s\"", ccgroup);
93     if (sgroup && sgroup[0])
94         avio_printf(out, ",SUBTITLES=\"%s\"", sgroup);
95     avio_printf(out, "\n%s\n\n", filename);
96 }
97
98 void ff_hls_write_playlist_header(AVIOContext *out, int version, int allowcache,
99                                   int target_duration, int64_t sequence,
100                                   uint32_t playlist_type, int iframe_mode)
101 {
102     if (!out)
103         return;
104     ff_hls_write_playlist_version(out, version);
105     if (allowcache == 0 || allowcache == 1) {
106         avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", allowcache == 0 ? "NO" : "YES");
107     }
108     avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
109     avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
110     av_log(NULL, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
111
112     if (playlist_type == PLAYLIST_TYPE_EVENT) {
113         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
114     } else if (playlist_type == PLAYLIST_TYPE_VOD) {
115         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
116     }
117     if (iframe_mode) {
118         avio_printf(out, "#EXT-X-I-FRAMES-ONLY\n");
119     }
120 }
121
122 void ff_hls_write_init_file(AVIOContext *out, const char *filename,
123                             int byterange_mode, int64_t size, int64_t pos)
124 {
125     avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", filename);
126     if (byterange_mode) {
127         avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", size, pos);
128     }
129     avio_printf(out, "\n");
130 }
131
132 int ff_hls_write_file_entry(AVIOContext *out, int insert_discont,
133                             int byterange_mode, double duration,
134                             int round_duration, int64_t size,
135                             int64_t pos /* Used only if HLS_SINGLE_FILE flag is set */,
136                             const char *baseurl /* Ignored if NULL */,
137                             const char *filename, double *prog_date_time,
138                             int64_t video_keyframe_size, int64_t video_keyframe_pos,
139                             int iframe_mode)
140 {
141     if (!out || !filename)
142         return AVERROR(EINVAL);
143
144     if (insert_discont) {
145         avio_printf(out, "#EXT-X-DISCONTINUITY\n");
146     }
147     if (round_duration)
148         avio_printf(out, "#EXTINF:%ld,\n",  lrint(duration));
149     else
150         avio_printf(out, "#EXTINF:%f,\n", duration);
151     if (byterange_mode)
152         avio_printf(out, "#EXT-X-BYTERANGE:%"PRId64"@%"PRId64"\n", iframe_mode ? video_keyframe_size : size,
153                     iframe_mode ? video_keyframe_pos : pos);
154
155     if (prog_date_time) {
156         time_t tt, wrongsecs;
157         int milli;
158         struct tm *tm, tmpbuf;
159         char buf0[128], buf1[128];
160         tt = (int64_t)*prog_date_time;
161         milli = av_clip(lrint(1000*(*prog_date_time - tt)), 0, 999);
162         tm = localtime_r(&tt, &tmpbuf);
163         if (!strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm)) {
164             av_log(NULL, AV_LOG_DEBUG, "strftime error in ff_hls_write_file_entry\n");
165             return AVERROR_UNKNOWN;
166         }
167         if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
168             int tz_min, dst = tm->tm_isdst;
169             tm = gmtime_r(&tt, &tmpbuf);
170             tm->tm_isdst = dst;
171             wrongsecs = mktime(tm);
172             tz_min = (FFABS(wrongsecs - tt) + 30) / 60;
173             snprintf(buf1, sizeof(buf1),
174                      "%c%02d%02d",
175                      wrongsecs <= tt ? '+' : '-',
176                      tz_min / 60,
177                      tz_min % 60);
178         }
179         avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
180         *prog_date_time += duration;
181     }
182     if (baseurl)
183         avio_printf(out, "%s", baseurl);
184     avio_printf(out, "%s\n", filename);
185
186     return 0;
187 }
188
189 void ff_hls_write_end_list(AVIOContext *out)
190 {
191     if (!out)
192         return;
193     avio_printf(out, "#EXT-X-ENDLIST\n");
194 }
195