vplayerdec.c
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1 /*
2  * Copyright (c) 2012 Clément Bœsch
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * VPlayer subtitles format demuxer
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 
30 typedef struct {
33 
34 static int vplayer_probe(AVProbeData *p)
35 {
36  char c;
37  const unsigned char *ptr = p->buf;
38 
39  if (sscanf(ptr, "%*d:%*d:%*d.%*d%c", &c) == 1 && strchr(": =", c))
40  return AVPROBE_SCORE_MAX;
41  return 0;
42 }
43 
44 static int64_t read_ts(char **line)
45 {
46  char c;
47  int hh, mm, ss, ms, len;
48 
49  if (sscanf(*line, "%d:%d:%d.%d%c%n",
50  &hh, &mm, &ss, &ms, &c, &len) >= 5) {
51  *line += len;
52  return (hh*3600LL + mm*60LL + ss) * 100LL + ms;
53  }
54  return AV_NOPTS_VALUE;
55 }
56 
58 {
59  VPlayerContext *vplayer = s->priv_data;
61 
62  if (!st)
63  return AVERROR(ENOMEM);
64  avpriv_set_pts_info(st, 64, 1, 100);
67 
68  while (!url_feof(s->pb)) {
69  char line[4096];
70  char *p = line;
71  const int64_t pos = avio_tell(s->pb);
72  int len = ff_get_line(s->pb, line, sizeof(line));
73  int64_t pts_start;
74 
75  if (!len)
76  break;
77 
78  line[strcspn(line, "\r\n")] = 0;
79 
80  pts_start = read_ts(&p);
81  if (pts_start != AV_NOPTS_VALUE) {
82  AVPacket *sub;
83 
84  sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
85  if (!sub)
86  return AVERROR(ENOMEM);
87  sub->pos = pos;
88  sub->pts = pts_start;
89  sub->duration = -1;
90  }
91  }
92 
93  ff_subtitles_queue_finalize(&vplayer->q);
94  return 0;
95 }
96 
98 {
99  VPlayerContext *vplayer = s->priv_data;
100  return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
101 }
102 
103 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
104  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
105 {
106  VPlayerContext *vplayer = s->priv_data;
107  return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
108  min_ts, ts, max_ts, flags);
109 }
110 
112 {
113  VPlayerContext *vplayer = s->priv_data;
114  ff_subtitles_queue_clean(&vplayer->q);
115  return 0;
116 }
117 
119  .name = "vplayer",
120  .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
121  .priv_data_size = sizeof(VPlayerContext),
125  .read_seek2 = vplayer_read_seek,
127  .extensions = "txt",
128 };
const char * s
Definition: avisynth_c.h:668
FFDemuxSubtitlesQueue q
Definition: vplayerdec.c:31
int64_t pos
byte position in stream, -1 if unknown
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:134
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, int len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:26
Format I/O context.
Definition: avformat.h:944
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:82
static AVPacket pkt
Definition: demuxing.c:56
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
static int vplayer_read_close(AVFormatContext *s)
Definition: vplayerdec.c:111
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int vplayer_probe(AVProbeData *p)
Definition: vplayerdec.c:34
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
static int64_t read_ts(char **line)
Definition: vplayerdec.c:44
AVInputFormat ff_vplayer_demuxer
Definition: vplayerdec.c:118
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: graph2dot.c:48
static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vplayerdec.c:97
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:662
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
static int read_probe(AVProbeData *pd)
static int vplayer_read_header(AVFormatContext *s)
Definition: vplayerdec.c:57
void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
Set missing durations and sort subtitles by PTS, and then byte position.
Definition: subtitles.c:72
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:618
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:517
Stream structure.
Definition: avformat.h:643
NULL
Definition: eval.c:55
int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Update current_sub_idx to emulate a seek.
Definition: subtitles.c:95
enum AVMediaType codec_type
enum AVCodecID codec_id
AVIOContext * pb
I/O context.
Definition: avformat.h:977
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer 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.Buffer references ownership and permissions
static int flags
Definition: cpu.c:23
#define AVPROBE_SCORE_MAX
maximum score, half of that is used for file-extension-based detection
Definition: avformat.h:340
Main libavformat public API header.
static double c[64]
static int vplayer_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: vplayerdec.c:103
int len
void * priv_data
Format private data.
Definition: avformat.h:964
About Git write you should know how to use GIT properly Luckily Git comes with excellent documentation git help man git shows you the available git< command > help man git< command > shows information about the subcommand< command > The most comprehensive manual is the website Git Reference visit they are quite exhaustive You do not need a special username or password All you need is to provide a ssh public key to the Git server admin What follows now is a basic introduction to Git and some FFmpeg specific guidelines Read it at least if you are granted commit privileges to the FFmpeg project you are expected to be familiar with these rules I if not You can get git from etc no matter how small Every one of them has been saved from looking like a fool by this many times It s very easy for stray debug output or cosmetic modifications to slip please avoid problems through this extra level of scrutiny For cosmetics only commits you should e g by running git config global user name My Name git config global user email my email which is either set in your personal configuration file through git config core editor or set by one of the following environment VISUAL or EDITOR Log messages should be concise but descriptive Explain why you made a what you did will be obvious from the changes themselves most of the time Saying just bug fix or is bad Remember that people of varying skill levels look at and educate themselves while reading through your code Don t include filenames in log Git provides that information Possibly make the commit message have a descriptive first line
Definition: git-howto.txt:153
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:461
This structure stores compressed data.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:190