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aqtitledec.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  * AQTitle subtitles format demuxer
24  *
25  * @see http://web.archive.org/web/20070210095721/http://www.volny.cz/aberka/czech/aqt.html
26  * @see https://trac.annodex.net/wiki/AQTitle
27  */
28 
29 #include "avformat.h"
30 #include "internal.h"
31 #include "subtitles.h"
32 #include "libavutil/opt.h"
33 
34 typedef struct {
35  const AVClass *class;
39 
40 static int aqt_probe(AVProbeData *p)
41 {
42  int frame;
43  const char *ptr = p->buf;
44 
45  if (sscanf(ptr, "-->> %d", &frame) == 1)
47  return 0;
48 }
49 
51 {
52  AQTitleContext *aqt = s->priv_data;
54  int new_event = 1;
55  int64_t pos = 0, frame = AV_NOPTS_VALUE;
56  AVPacket *sub = NULL;
57 
58  if (!st)
59  return AVERROR(ENOMEM);
60  avpriv_set_pts_info(st, 64, aqt->frame_rate.den, aqt->frame_rate.num);
63 
64  while (!avio_feof(s->pb)) {
65  char line[4096];
66  int len = ff_get_line(s->pb, line, sizeof(line));
67 
68  if (!len)
69  break;
70 
71  line[strcspn(line, "\r\n")] = 0;
72 
73  if (sscanf(line, "-->> %"SCNd64, &frame) == 1) {
74  new_event = 1;
75  pos = avio_tell(s->pb);
76  if (sub) {
77  sub->duration = frame - sub->pts;
78  sub = NULL;
79  }
80  } else if (*line) {
81  if (!new_event) {
82  sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1);
83  if (!sub)
84  return AVERROR(ENOMEM);
85  }
86  sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event);
87  if (!sub)
88  return AVERROR(ENOMEM);
89  if (new_event) {
90  sub->pts = frame;
91  sub->duration = -1;
92  sub->pos = pos;
93  }
94  new_event = 0;
95  }
96  }
97 
99  return 0;
100 }
101 
103 {
104  AQTitleContext *aqt = s->priv_data;
105  return ff_subtitles_queue_read_packet(&aqt->q, pkt);
106 }
107 
108 static int aqt_read_seek(AVFormatContext *s, int stream_index,
109  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
110 {
111  AQTitleContext *aqt = s->priv_data;
112  return ff_subtitles_queue_seek(&aqt->q, s, stream_index,
113  min_ts, ts, max_ts, flags);
114 }
115 
117 {
118  AQTitleContext *aqt = s->priv_data;
120  return 0;
121 }
122 
123 #define OFFSET(x) offsetof(AQTitleContext, x)
124 #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
125 static const AVOption aqt_options[] = {
126  { "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD },
127  { NULL }
128 };
129 
130 static const AVClass aqt_class = {
131  .class_name = "aqtdec",
132  .item_name = av_default_item_name,
133  .option = aqt_options,
134  .version = LIBAVUTIL_VERSION_INT,
135 };
136 
138  .name = "aqtitle",
139  .long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"),
140  .priv_data_size = sizeof(AQTitleContext),
144  .read_seek2 = aqt_read_seek,
146  .extensions = "aqt",
147  .priv_class = &aqt_class,
148 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
AVOption.
Definition: opt.h:255
#define LIBAVUTIL_VERSION_INT
Definition: version.h:62
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1198
#define OFFSET(x)
Definition: aqtitledec.c:123
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:4006
int num
numerator
Definition: rational.h:44
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:270
static AVPacket pkt
static int aqt_read_header(AVFormatContext *s)
Definition: aqtitledec.c:50
static const AVOption aqt_options[]
Definition: aqtitledec.c:125
Format I/O context.
Definition: avformat.h:1272
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
static int aqt_read_close(AVFormatContext *s)
Definition: aqtitledec.c:116
AVOptions.
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3672
static AVFrame * frame
AVRational frame_rate
Definition: aqtitledec.c:37
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1191
FFDemuxSubtitlesQueue q
Definition: aqtitledec.c:36
static int aqt_probe(AVProbeData *p)
Definition: aqtitledec.c:40
av_default_item_name
#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 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
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
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:1260
enum AVCodecID codec_id
Definition: avcodec.h:1269
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
Describe the class of an AVClass context structure.
Definition: log.h:67
rational number numerator/denominator
Definition: rational.h:43
#define SD
Definition: aqtitledec.c:124
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:458
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
static int flags
Definition: cpu.c:47
static const AVClass aqt_class
Definition: aqtitledec.c:130
Main libavformat public API header.
raw UTF-8 text
Definition: avcodec.h:512
int den
denominator
Definition: rational.h:45
static int aqt_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: aqtitledec.c:108
int len
void * priv_data
Format private data.
Definition: avformat.h:1300
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
AVInputFormat ff_aqtitle_demuxer
Definition: aqtitledec.c:137
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:1150
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1166
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aqtitledec.c:102