FFmpeg
hlsplaylist.c
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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 #include <time.h>
26 
28 
29 #include "avformat.h"
30 #include "hlsplaylist.h"
31 
33 {
34  if (!out)
35  return;
36  avio_printf(out, "#EXTM3U\n");
37  avio_printf(out, "#EXT-X-VERSION:%d\n", version);
38 }
39 
40 void ff_hls_write_audio_rendition(AVIOContext *out, const char *agroup,
41  const char *filename, const char *language,
42  int name_id, int is_default, int nb_channels)
43 {
44  if (!out || !agroup || !filename)
45  return;
46 
47  avio_printf(out, "#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID=\"group_%s\"", agroup);
48  avio_printf(out, ",NAME=\"audio_%d\",DEFAULT=%s,", name_id, is_default ? "YES" : "NO");
49  if (language) {
50  avio_printf(out, "LANGUAGE=\"%s\",", language);
51  }
52  if (nb_channels) {
53  avio_printf(out, "CHANNELS=\"%d\",", nb_channels);
54  }
55  avio_printf(out, "URI=\"%s\"\n", filename);
56 }
57 
59  const char *filename, const char *language,
60  int name_id, int is_default)
61 {
62  if (!out || !filename)
63  return;
64 
65  avio_printf(out, "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"%s\"", sgroup);
66  avio_printf(out, ",NAME=\"subtitle_%d\",DEFAULT=%s,", name_id, is_default ? "YES" : "NO");
67  if (language) {
68  avio_printf(out, "LANGUAGE=\"%s\",", language);
69  }
70  avio_printf(out, "URI=\"%s\"\n", filename);
71 }
72 
74  const char *filename, const char *agroup,
75  const char *codecs, const char *ccgroup,
76  const char *sgroup)
77 {
78  if (!out || !filename)
79  return;
80 
81  if (!bandwidth) {
83  "Bandwidth info not available, set audio and video bitrates\n");
84  return;
85  }
86 
87  avio_printf(out, "#EXT-X-STREAM-INF:BANDWIDTH=%d", bandwidth);
88  if (st && st->codecpar->width > 0 && st->codecpar->height > 0)
89  avio_printf(out, ",RESOLUTION=%dx%d", st->codecpar->width,
90  st->codecpar->height);
91  if (codecs && codecs[0])
92  avio_printf(out, ",CODECS=\"%s\"", codecs);
93  if (agroup && agroup[0])
94  avio_printf(out, ",AUDIO=\"group_%s\"", agroup);
95  if (ccgroup && ccgroup[0])
96  avio_printf(out, ",CLOSED-CAPTIONS=\"%s\"", ccgroup);
97  if (sgroup && sgroup[0])
98  avio_printf(out, ",SUBTITLES=\"%s\"", sgroup);
99  avio_printf(out, "\n%s\n\n", filename);
100 }
101 
103  int target_duration, int64_t sequence,
104  uint32_t playlist_type, int iframe_mode)
105 {
106  if (!out)
107  return;
109  if (allowcache == 0 || allowcache == 1) {
110  avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", allowcache == 0 ? "NO" : "YES");
111  }
112  avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
113  avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
114  av_log(NULL, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
115 
116  if (playlist_type == PLAYLIST_TYPE_EVENT) {
117  avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
118  } else if (playlist_type == PLAYLIST_TYPE_VOD) {
119  avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
120  }
121  if (iframe_mode) {
122  avio_printf(out, "#EXT-X-I-FRAMES-ONLY\n");
123  }
124 }
125 
126 void ff_hls_write_init_file(AVIOContext *out, const char *filename,
127  int byterange_mode, int64_t size, int64_t pos)
128 {
129  avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", filename);
130  if (byterange_mode) {
131  avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", size, pos);
132  }
133  avio_printf(out, "\n");
134 }
135 
136 int ff_hls_write_file_entry(AVIOContext *out, int insert_discont,
137  int byterange_mode, double duration,
138  int round_duration, int64_t size,
139  int64_t pos /* Used only if HLS_SINGLE_FILE flag is set */,
140  const char *baseurl /* Ignored if NULL */,
141  const char *filename, double *prog_date_time,
142  int64_t video_keyframe_size, int64_t video_keyframe_pos,
143  int iframe_mode)
144 {
145  if (!out || !filename)
146  return AVERROR(EINVAL);
147 
148  if (insert_discont) {
149  avio_printf(out, "#EXT-X-DISCONTINUITY\n");
150  }
151  if (round_duration)
152  avio_printf(out, "#EXTINF:%ld,\n", lrint(duration));
153  else
154  avio_printf(out, "#EXTINF:%f,\n", duration);
155  if (byterange_mode)
156  avio_printf(out, "#EXT-X-BYTERANGE:%"PRId64"@%"PRId64"\n", iframe_mode ? video_keyframe_size : size,
157  iframe_mode ? video_keyframe_pos : pos);
158 
159  if (prog_date_time) {
160  time_t tt, wrongsecs;
161  int milli;
162  struct tm *tm, tmpbuf;
163  char buf0[128], buf1[128];
164  tt = (int64_t)*prog_date_time;
165  milli = av_clip(lrint(1000*(*prog_date_time - tt)), 0, 999);
166  tm = localtime_r(&tt, &tmpbuf);
167  if (!strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm)) {
168  av_log(NULL, AV_LOG_DEBUG, "strftime error in ff_hls_write_file_entry\n");
169  return AVERROR_UNKNOWN;
170  }
171  if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
172  int tz_min, dst = tm->tm_isdst;
173  tm = gmtime_r(&tt, &tmpbuf);
174  tm->tm_isdst = dst;
175  wrongsecs = mktime(tm);
176  tz_min = (FFABS(wrongsecs - tt) + 30) / 60;
177  snprintf(buf1, sizeof(buf1),
178  "%c%02d%02d",
179  wrongsecs <= tt ? '+' : '-',
180  tz_min / 60,
181  tz_min % 60);
182  }
183  avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
184  *prog_date_time += duration;
185  }
186  if (baseurl)
187  avio_printf(out, "%s", baseurl);
188  avio_printf(out, "%s\n", filename);
189 
190  return 0;
191 }
192 
194 {
195  if (!out)
196  return;
197  avio_printf(out, "#EXT-X-ENDLIST\n");
198 }
199 
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
av_clip
#define av_clip
Definition: common.h:100
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
out
FILE * out
Definition: movenc.c:55
ff_hls_write_end_list
void ff_hls_write_end_list(AVIOContext *out)
Definition: hlsplaylist.c:193
PLAYLIST_TYPE_VOD
@ PLAYLIST_TYPE_VOD
Definition: hlsplaylist.h:34
PLAYLIST_TYPE_EVENT
@ PLAYLIST_TYPE_EVENT
Definition: hlsplaylist.h:33
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
AVERROR_UNKNOWN
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:73
hlsplaylist.h
ff_hls_write_playlist_header
void ff_hls_write_playlist_header(AVIOContext *out, int version, int allowcache, int target_duration, int64_t sequence, uint32_t playlist_type, int iframe_mode)
Definition: hlsplaylist.c:102
gmtime_r
#define gmtime_r
Definition: time_internal.h:34
lrint
#define lrint
Definition: tablegen.h:53
ff_hls_write_subtitle_rendition
void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup, const char *filename, const char *language, int name_id, int is_default)
Definition: hlsplaylist.c:58
duration
int64_t duration
Definition: movenc.c:65
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:74
time_internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
NULL
#define NULL
Definition: coverity.c:32
codecs
static const struct codec_string codecs[]
time.h
ff_hls_write_playlist_version
void ff_hls_write_playlist_version(AVIOContext *out, int version)
Definition: hlsplaylist.c:32
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
localtime_r
#define localtime_r
Definition: time_internal.h:46
size
int size
Definition: twinvq_data.h:10344
ff_hls_write_init_file
void ff_hls_write_init_file(AVIOContext *out, const char *filename, int byterange_mode, int64_t size, int64_t pos)
Definition: hlsplaylist.c:126
version
version
Definition: libkvazaar.c:321
ff_hls_write_audio_rendition
void ff_hls_write_audio_rendition(AVIOContext *out, const char *agroup, const char *filename, const char *language, int name_id, int is_default, int nb_channels)
Definition: hlsplaylist.c:40
AVCodecParameters::height
int height
Definition: codec_par.h:135
language
Undefined Behavior In the C language
Definition: undefined.txt:3
AVStream
Stream structure.
Definition: avformat.h:743
ff_hls_write_file_entry
int ff_hls_write_file_entry(AVIOContext *out, int insert_discont, int byterange_mode, double duration, int round_duration, int64_t size, int64_t pos, const char *baseurl, const char *filename, double *prog_date_time, int64_t video_keyframe_size, int64_t video_keyframe_pos, int iframe_mode)
Definition: hlsplaylist.c:136
pos
unsigned int pos
Definition: spdifenc.c:414
avformat.h
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
ff_hls_write_stream_info
void ff_hls_write_stream_info(AVStream *st, AVIOContext *out, int bandwidth, const char *filename, const char *agroup, const char *codecs, const char *ccgroup, const char *sgroup)
Definition: hlsplaylist.c:73
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
snprintf
#define snprintf
Definition: snprintf.h:34