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
31void 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
39void 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
54void 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
69void 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
98void 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
122void 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
132int 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
189void ff_hls_write_end_list(AVIOContext *out)
190{
191    if (!out)
192        return;
193    avio_printf(out, "#EXT-X-ENDLIST\n");
194}
195
196