FFmpeg  4.4.4
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(const 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  if (frame >= sub->pts && (uint64_t)frame - sub->pts < INT64_MAX)
78  sub->duration = frame - sub->pts;
79  sub = NULL;
80  }
81  } else if (*line) {
82  if (!new_event) {
83  sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1);
84  if (!sub)
85  goto fail;
86  }
87  sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event);
88  if (!sub)
89  goto fail;
90  if (new_event) {
91  sub->pts = frame;
92  sub->duration = -1;
93  sub->pos = pos;
94  }
95  new_event = 0;
96  }
97  }
98 
100  return 0;
101 fail:
103  return AVERROR(ENOMEM);
104 }
105 
107 {
108  AQTitleContext *aqt = s->priv_data;
109  return ff_subtitles_queue_read_packet(&aqt->q, pkt);
110 }
111 
112 static int aqt_read_seek(AVFormatContext *s, int stream_index,
113  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
114 {
115  AQTitleContext *aqt = s->priv_data;
116  return ff_subtitles_queue_seek(&aqt->q, s, stream_index,
117  min_ts, ts, max_ts, flags);
118 }
119 
121 {
122  AQTitleContext *aqt = s->priv_data;
124  return 0;
125 }
126 
127 #define OFFSET(x) offsetof(AQTitleContext, x)
128 #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
129 static const AVOption aqt_options[] = {
130  { "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD },
131  { NULL }
132 };
133 
134 static const AVClass aqt_class = {
135  .class_name = "aqtdec",
136  .item_name = av_default_item_name,
137  .option = aqt_options,
138  .version = LIBAVUTIL_VERSION_INT,
139 };
140 
142  .name = "aqtitle",
143  .long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"),
144  .priv_data_size = sizeof(AQTitleContext),
148  .read_seek2 = aqt_read_seek,
150  .extensions = "aqt",
151  .priv_class = &aqt_class,
152 };
static const AVOption aqt_options[]
Definition: aqtitledec.c:129
static int aqt_read_close(AVFormatContext *s)
Definition: aqtitledec.c:120
AVInputFormat ff_aqtitle_demuxer
Definition: aqtitledec.c:141
static int aqt_probe(const AVProbeData *p)
Definition: aqtitledec.c:40
static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: aqtitledec.c:106
#define SD
Definition: aqtitledec.c:128
#define OFFSET(x)
Definition: aqtitledec.c:127
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:112
static int aqt_read_header(AVFormatContext *s)
Definition: aqtitledec.c:50
static const AVClass aqt_class
Definition: aqtitledec.c:134
Main libavformat public API header.
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
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 fail()
Definition: checkasm.h:133
#define NULL
Definition: coverity.c:32
static AVFrame * frame
static float sub(float src0, float src1)
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:230
@ AV_CODEC_ID_TEXT
raw UTF-8 text
Definition: codec_id.h:525
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR(e)
Definition: error.h:43
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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:4945
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
AVOptions.
unsigned int pos
Definition: spdifenc.c:412
AVRational frame_rate
Definition: aqtitledec.c:37
FFDemuxSubtitlesQueue q
Definition: aqtitledec.c:36
Describe the class of an AVClass context structure.
Definition: log.h:67
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
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
AVOption.
Definition: opt.h:248
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
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
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
AVPacket * pkt
Definition: movenc.c:59
int len