FFmpeg  4.4
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(const 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  if (end < start || end - (uint64_t)start > INT_MAX)
59  return AV_NOPTS_VALUE;
60  *duration = end - start;
61  return start;
62  }
63  return AV_NOPTS_VALUE;
64 }
65 
67 {
68  PJSContext *pjs = s->priv_data;
70 
71  if (!st)
72  return AVERROR(ENOMEM);
73  avpriv_set_pts_info(st, 64, 1, 10);
76 
77  while (!avio_feof(s->pb)) {
78  char line[4096];
79  char *p = line;
80  const int64_t pos = avio_tell(s->pb);
81  int len = ff_get_line(s->pb, line, sizeof(line));
82  int64_t pts_start;
83  int duration;
84 
85  if (!len)
86  break;
87 
88  line[strcspn(line, "\r\n")] = 0;
89 
90  pts_start = read_ts(&p, &duration);
91  if (pts_start != AV_NOPTS_VALUE) {
92  AVPacket *sub;
93 
94  p[strcspn(p, "\"")] = 0;
95  sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
96  if (!sub) {
98  return AVERROR(ENOMEM);
99  }
100  sub->pos = pos;
101  sub->pts = pts_start;
102  sub->duration = duration;
103  }
104  }
105 
107  return 0;
108 }
109 
111 {
112  PJSContext *pjs = s->priv_data;
113  return ff_subtitles_queue_read_packet(&pjs->q, pkt);
114 }
115 
116 static int pjs_read_seek(AVFormatContext *s, int stream_index,
117  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
118 {
119  PJSContext *pjs = s->priv_data;
120  return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
121  min_ts, ts, max_ts, flags);
122 }
123 
125 {
126  PJSContext *pjs = s->priv_data;
128  return 0;
129 }
130 
132  .name = "pjs",
133  .long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
134  .priv_data_size = sizeof(PJSContext),
138  .read_seek2 = pjs_read_seek,
140  .extensions = "pjs",
141 };
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:789
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
static float sub(float src0, float src1)
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
@ AV_CODEC_ID_PJS
Definition: codec_id.h:545
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
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:4941
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int pjs_read_close(AVFormatContext *s)
Definition: pjsdec.c:124
AVInputFormat ff_pjs_demuxer
Definition: pjsdec.c:131
static int64_t read_ts(char **line, int *duration)
Definition: pjsdec.c:51
static int pjs_read_header(AVFormatContext *s)
Definition: pjsdec.c:66
static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pjsdec.c:110
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:116
static int pjs_probe(const AVProbeData *p)
Definition: pjsdec.c:36
unsigned int pos
Definition: spdifenc.c:412
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
Format I/O context.
Definition: avformat.h:1232
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
FFDemuxSubtitlesQueue q
Definition: pjsdec.c:33
Definition: graph2dot.c:48
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:255
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:216
void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events.
Definition: subtitles.c:198
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:307
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
int64_t duration
Definition: movenc.c:64
AVPacket * pkt
Definition: movenc.c:59
int len
static double c[64]