FFmpeg
hlsplaylist.c
Go to the documentation of this file.
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 
27 #include "libavutil/time_internal.h"
28 
29 #include "avformat.h"
30 #include "hlsplaylist.h"
31 
32 void ff_hls_write_playlist_version(AVIOContext *out, int version)
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 
58 void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup,
59  const char *filename, const char *language,
60  const char *sname, 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  if (sname) {
67  avio_printf(out, ",NAME=\"%s\",", sname);
68  } else {
69  avio_printf(out, ",NAME=\"subtitle_%d\",", name_id);
70  }
71  avio_printf(out, "DEFAULT=%s,", is_default ? "YES" : "NO");
72  if (language) {
73  avio_printf(out, "LANGUAGE=\"%s\",", language);
74  }
75  avio_printf(out, "URI=\"%s\"\n", filename);
76 }
77 
78 void ff_hls_write_stream_info(AVStream *st, AVIOContext *out, int bandwidth,
79  int avg_bandwidth,
80  const char *filename, const char *agroup,
81  const char *codecs, const char *ccgroup,
82  const char *sgroup)
83 {
84  if (!out || !filename)
85  return;
86 
87  if (!bandwidth) {
88  av_log(NULL, AV_LOG_WARNING,
89  "Bandwidth info not available, set audio and video bitrates\n");
90  return;
91  }
92 
93  avio_printf(out, "#EXT-X-STREAM-INF:BANDWIDTH=%d", bandwidth);
94  if (avg_bandwidth)
95  avio_printf(out, ",AVERAGE-BANDWIDTH=%d", avg_bandwidth);
96  if (st && st->codecpar->width > 0 && st->codecpar->height > 0)
97  avio_printf(out, ",RESOLUTION=%dx%d", st->codecpar->width,
98  st->codecpar->height);
99  if (codecs && codecs[0])
100  avio_printf(out, ",CODECS=\"%s\"", codecs);
101  if (agroup && agroup[0])
102  avio_printf(out, ",AUDIO=\"group_%s\"", agroup);
103  if (ccgroup && ccgroup[0])
104  avio_printf(out, ",CLOSED-CAPTIONS=\"%s\"", ccgroup);
105  if (sgroup && sgroup[0])
106  avio_printf(out, ",SUBTITLES=\"%s\"", sgroup);
107  avio_printf(out, "\n%s\n\n", filename);
108 }
109 
110 void ff_hls_write_playlist_header(AVIOContext *out, int version, int allowcache,
111  int target_duration, int64_t sequence,
112  uint32_t playlist_type, int iframe_mode)
113 {
114  if (!out)
115  return;
116  ff_hls_write_playlist_version(out, version);
117  if (allowcache == 0 || allowcache == 1) {
118  avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", allowcache == 0 ? "NO" : "YES");
119  }
120  avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
121  avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
122  av_log(NULL, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
123 
124  if (playlist_type == PLAYLIST_TYPE_EVENT) {
125  avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
126  } else if (playlist_type == PLAYLIST_TYPE_VOD) {
127  avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
128  }
129  if (iframe_mode) {
130  avio_printf(out, "#EXT-X-I-FRAMES-ONLY\n");
131  }
132 }
133 
134 void ff_hls_write_init_file(AVIOContext *out, const char *filename,
135  int byterange_mode, int64_t size, int64_t pos)
136 {
137  avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", filename);
138  if (byterange_mode) {
139  avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", size, pos);
140  }
141  avio_printf(out, "\n");
142 }
143 
144 int ff_hls_write_file_entry(AVIOContext *out, int insert_discont,
145  int byterange_mode, double duration,
146  int round_duration, int64_t size,
147  int64_t pos /* Used only if HLS_SINGLE_FILE flag is set */,
148  const char *baseurl /* Ignored if NULL */,
149  const char *filename, double *prog_date_time,
150  int64_t video_keyframe_size, int64_t video_keyframe_pos,
151  int iframe_mode)
152 {
153  if (!out || !filename)
154  return AVERROR(EINVAL);
155 
156  if (insert_discont) {
157  avio_printf(out, "#EXT-X-DISCONTINUITY\n");
158  }
159  if (round_duration)
160  avio_printf(out, "#EXTINF:%ld,\n", lrint(duration));
161  else
162  avio_printf(out, "#EXTINF:%f,\n", duration);
163  if (byterange_mode)
164  avio_printf(out, "#EXT-X-BYTERANGE:%"PRId64"@%"PRId64"\n", iframe_mode ? video_keyframe_size : size,
165  iframe_mode ? video_keyframe_pos : pos);
166 
167  if (prog_date_time) {
168  time_t tt, wrongsecs;
169  int milli;
170  struct tm *tm, tmpbuf;
171  char buf0[128], buf1[128];
172  tt = (int64_t)*prog_date_time;
173  milli = av_clip(lrint(1000*(*prog_date_time - tt)), 0, 999);
174  tm = localtime_r(&tt, &tmpbuf);
175  if (!strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm)) {
176  av_log(NULL, AV_LOG_DEBUG, "strftime error in ff_hls_write_file_entry\n");
177  return AVERROR_UNKNOWN;
178  }
179  if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
180  int tz_min, dst = tm->tm_isdst;
181  tm = gmtime_r(&tt, &tmpbuf);
182  tm->tm_isdst = dst;
183  wrongsecs = mktime(tm);
184  tz_min = (FFABS(wrongsecs - tt) + 30) / 60;
185  snprintf(buf1, sizeof(buf1),
186  "%c%02d%02d",
187  wrongsecs <= tt ? '+' : '-',
188  tz_min / 60,
189  tz_min % 60);
190  }
191  avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
192  *prog_date_time += duration;
193  }
194  if (baseurl)
195  avio_printf(out, "%s", baseurl);
196  avio_printf(out, "%s\n", filename);
197 
198  return 0;
199 }
200 
201 void ff_hls_write_end_list(AVIOContext *out)
202 {
203  if (!out)
204  return;
205  avio_printf(out, "#EXT-X-ENDLIST\n");
206 }
207 
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:215
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:201
PLAYLIST_TYPE_VOD
@ PLAYLIST_TYPE_VOD
Definition: hlsplaylist.h:34
int64_t
long long int64_t
Definition: coverity.c:34
PLAYLIST_TYPE_EVENT
@ PLAYLIST_TYPE_EVENT
Definition: hlsplaylist.h:33
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:225
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:110
gmtime_r
#define gmtime_r
Definition: time_internal.h:34
lrint
#define lrint
Definition: tablegen.h:53
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:230
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
ff_hls_write_subtitle_rendition
void ff_hls_write_subtitle_rendition(AVIOContext *out, const char *sgroup, const char *filename, const char *language, const char *sname, int name_id, int is_default)
Definition: hlsplaylist.c:58
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:771
NULL
#define NULL
Definition: coverity.c:32
codecs
static const struct codec_string codecs[]
time.h
ff_hls_write_stream_info
void ff_hls_write_stream_info(AVStream *st, AVIOContext *out, int bandwidth, int avg_bandwidth, const char *filename, const char *agroup, const char *codecs, const char *ccgroup, const char *sgroup)
Definition: hlsplaylist.c:78
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
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:83
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:134
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:748
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:144
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.
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
snprintf
#define snprintf
Definition: snprintf.h:34
Generated on Thu Nov 14 2024 19:22:52 for FFmpeg by   doxygen 1.8.17