FFmpeg
subviewer1dec.c
Go to the documentation of this file.
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  * SubViewer v1 subtitle demuxer
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 
30 typedef struct {
33 
34 static int subviewer1_probe(const AVProbeData *p)
35 {
36  const unsigned char *ptr = p->buf;
37 
38  if (strstr(ptr, "******** START SCRIPT ********"))
40  return 0;
41 }
42 
44 {
45  int delay = 0;
46  AVPacket *sub = NULL;
47  SubViewer1Context *subviewer1 = s->priv_data;
49 
50  if (!st)
51  return AVERROR(ENOMEM);
52  avpriv_set_pts_info(st, 64, 1, 1);
55 
56  while (!avio_feof(s->pb)) {
57  char line[4096];
58  int len = ff_get_line(s->pb, line, sizeof(line));
59  int hh, mm, ss;
60 
61  if (!len)
62  break;
63 
64  if (!strncmp(line, "[DELAY]", 7)) {
65  ff_get_line(s->pb, line, sizeof(line));
66  sscanf(line, "%d", &delay);
67  }
68 
69  if (sscanf(line, "[%d:%d:%d]", &hh, &mm, &ss) == 3) {
70  const int64_t pos = avio_tell(s->pb);
71  int64_t pts_start = hh*3600LL + mm*60LL + ss + delay;
72 
73  len = ff_get_line(s->pb, line, sizeof(line));
74  line[strcspn(line, "\r\n")] = 0;
75  if (!*line) {
76  if (sub)
77  sub->duration = pts_start - sub->pts;
78  } else {
79  sub = ff_subtitles_queue_insert(&subviewer1->q, line, len, 0);
80  if (!sub)
81  return AVERROR(ENOMEM);
82  sub->pos = pos;
83  sub->pts = pts_start;
84  sub->duration = -1;
85  }
86  }
87  }
88 
89  ff_subtitles_queue_finalize(s, &subviewer1->q);
90  return 0;
91 }
92 
94  .name = "subviewer1",
95  .long_name = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
96  .priv_data_size = sizeof(SubViewer1Context),
97  .flags_internal = FF_FMT_INIT_CLEANUP,
100  .extensions = "sub",
102  .read_seek2 = ff_subtitles_read_seek,
104 };
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
ff_subtitles_read_close
int ff_subtitles_read_close(AVFormatContext *s)
Definition: subtitles.c:330
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:50
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame 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. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4374
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
sub
static float sub(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:31
subviewer1_read_header
static int subviewer1_read_header(AVFormatContext *s)
Definition: subviewer1dec.c:43
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:141
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:538
SubViewer1Context
Definition: subviewer1dec.c:30
AV_CODEC_ID_SUBVIEWER1
@ AV_CODEC_ID_SUBVIEWER1
Definition: codec_id.h:535
ss
#define ss(width, name, subs,...)
Definition: cbs_vp9.c:261
AVInputFormat
Definition: avformat.h:626
ff_subtitles_read_packet
int ff_subtitles_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: subtitles.c:316
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
SubViewer1Context::q
FFDemuxSubtitlesQueue q
Definition: subviewer1dec.c:31
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
ff_subtitles_queue_insert
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, size_t len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:110
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
subviewer1_probe
static int subviewer1_probe(const AVProbeData *p)
Definition: subviewer1dec.c:34
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
avpriv_set_pts_info
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:4799
ff_subtitles_queue_finalize
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:197
FFDemuxSubtitlesQueue
Definition: subtitles.h:102
line
Definition: graph2dot.c:48
ff_subtitles_read_seek
int ff_subtitles_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: subtitles.c:322
ff_get_line
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:772
len
int len
Definition: vorbis_enc_data.h:426
ff_subviewer1_demuxer
const AVInputFormat ff_subviewer1_demuxer
Definition: subviewer1dec.c:93
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:847
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
subtitles.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:354