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pjsdec.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  * PJS (Phoenix Japanimation Society) subtitles format demuxer
24  *
25  * @see http://subs.com.ru/page.php?al=pjs
26  */
27 
28 #include "avformat.h"
29 #include "internal.h"
30 #include "subtitles.h"
31 
32 typedef struct {
34 } PJSContext;
35 
36 static int pjs_probe(AVProbeData *p)
37 {
38  char c;
39  int64_t start, end;
40  const unsigned char *ptr = p->buf;
41 
42  if (sscanf(ptr, "%"SCNd64",%"SCNd64",%c", &start, &end, &c) == 3) {
43  size_t q1pos = strcspn(ptr, "\"");
44  size_t q2pos = q1pos + strcspn(ptr + q1pos + 1, "\"") + 1;
45  if (strcspn(ptr, "\r\n") > q2pos)
46  return AVPROBE_SCORE_MAX;
47  }
48  return 0;
49 }
50 
51 static int64_t read_ts(char **line, int *duration)
52 {
53  int64_t start, end;
54 
55  if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) {
56  *line += strcspn(*line, "\"");
57  *line += !!**line;
58  *duration = end - start;
59  return start;
60  }
61  return AV_NOPTS_VALUE;
62 }
63 
65 {
66  PJSContext *pjs = s->priv_data;
68  int res = 0;
69 
70  if (!st)
71  return AVERROR(ENOMEM);
72  avpriv_set_pts_info(st, 64, 1, 10);
75 
76  while (!avio_feof(s->pb)) {
77  char line[4096];
78  char *p = line;
79  const int64_t pos = avio_tell(s->pb);
80  int len = ff_get_line(s->pb, line, sizeof(line));
81  int64_t pts_start;
82  int duration;
83 
84  if (!len)
85  break;
86 
87  line[strcspn(line, "\r\n")] = 0;
88 
89  pts_start = read_ts(&p, &duration);
90  if (pts_start != AV_NOPTS_VALUE) {
91  AVPacket *sub;
92 
93  p[strcspn(p, "\"")] = 0;
94  sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
95  if (!sub)
96  return AVERROR(ENOMEM);
97  sub->pos = pos;
98  sub->pts = pts_start;
99  sub->duration = duration;
100  }
101  }
102 
104  return res;
105 }
106 
108 {
109  PJSContext *pjs = s->priv_data;
110  return ff_subtitles_queue_read_packet(&pjs->q, pkt);
111 }
112 
113 static int pjs_read_seek(AVFormatContext *s, int stream_index,
114  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
115 {
116  PJSContext *pjs = s->priv_data;
117  return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
118  min_ts, ts, max_ts, flags);
119 }
120 
122 {
123  PJSContext *pjs = s->priv_data;
125  return 0;
126 }
127 
129  .name = "pjs",
130  .long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
131  .priv_data_size = sizeof(PJSContext),
135  .read_seek2 = pjs_read_seek,
137  .extensions = "pjs",
138 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1447
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.
Definition: utils.c:4075
static int64_t read_ts(char **line, int *duration)
Definition: pjsdec.c:51
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:270
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1273
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:181
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3741
static int pjs_read_close(AVFormatContext *s)
Definition: pjsdec.c:121
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
FFDemuxSubtitlesQueue q
Definition: pjsdec.c:33
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
static int64_t duration
Definition: ffplay.c:326
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1440
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
Definition: graph2dot.c:48
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
static int pjs_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: pjsdec.c:113
static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pjsdec.c:107
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
Set missing durations and sort subtitles by PTS, and then byte position.
Definition: subtitles.c:169
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:698
AVInputFormat ff_pjs_demuxer
Definition: pjsdec.c:128
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
static int pjs_read_header(AVFormatContext *s)
Definition: pjsdec.c:64
Stream structure.
Definition: avformat.h:842
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
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:218
enum AVMediaType codec_type
Definition: avcodec.h:1509
enum AVCodecID codec_id
Definition: avcodec.h:1518
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
static int pjs_probe(AVProbeData *p)
Definition: pjsdec.c:36
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
static int flags
Definition: cpu.c:47
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
static double c[64]
int len
void * priv_data
Format private data.
Definition: avformat.h:1301
void INT64 start
Definition: avisynth_c.h:553
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:301
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, size_t len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:111
This structure stores compressed data.
Definition: avcodec.h:1399
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1415
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240