FFmpeg
vplayerdec.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  * VPlayer subtitles format demuxer
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 
30 typedef struct {
33 
34 static int vplayer_probe(const AVProbeData *p)
35 {
36  char c;
37  const unsigned char *ptr = p->buf;
38 
39  if ((sscanf(ptr, "%*3d:%*2d:%*2d.%*2d%c", &c) == 1 ||
40  sscanf(ptr, "%*3d:%*2d:%*2d%c", &c) == 1) && strchr(": =", c))
41  return AVPROBE_SCORE_MAX;
42  return 0;
43 }
44 
45 static int64_t read_ts(char **line)
46 {
47  char c;
48  int hh, mm, ss, ms, n, len;
49 
50  if (((n = sscanf(*line, "%d:%d:%d.%d%c%n", &hh, &mm, &ss, &ms, &c, &len)) >= 5 ||
51  (n = sscanf(*line, "%d:%d:%d%c%n", &hh, &mm, &ss, &c, &len)) >= 4) && strchr(": =", c)) {
52  *line += len;
53  return (hh*3600LL + mm*60LL + ss) * 100LL + (n < 5 ? 0 : ms);
54  }
55  return AV_NOPTS_VALUE;
56 }
57 
59 {
60  VPlayerContext *vplayer = s->priv_data;
62 
63  if (!st)
64  return AVERROR(ENOMEM);
65  avpriv_set_pts_info(st, 64, 1, 100);
68 
69  while (!avio_feof(s->pb)) {
70  char line[4096];
71  char *p = line;
72  const int64_t pos = avio_tell(s->pb);
73  int len = ff_get_line(s->pb, line, sizeof(line));
74  int64_t pts_start;
75 
76  if (!len)
77  break;
78 
79  line[strcspn(line, "\r\n")] = 0;
80 
81  pts_start = read_ts(&p);
82  if (pts_start != AV_NOPTS_VALUE) {
83  AVPacket *sub;
84 
85  sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
86  if (!sub) {
87  ff_subtitles_queue_clean(&vplayer->q);
88  return AVERROR(ENOMEM);
89  }
90  sub->pos = pos;
91  sub->pts = pts_start;
92  sub->duration = -1;
93  }
94  }
95 
96  ff_subtitles_queue_finalize(s, &vplayer->q);
97  return 0;
98 }
99 
101 {
102  VPlayerContext *vplayer = s->priv_data;
103  return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
104 }
105 
106 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
107  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
108 {
109  VPlayerContext *vplayer = s->priv_data;
110  return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
111  min_ts, ts, max_ts, flags);
112 }
113 
115 {
116  VPlayerContext *vplayer = s->priv_data;
117  ff_subtitles_queue_clean(&vplayer->q);
118  return 0;
119 }
120 
122  .name = "vplayer",
123  .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
124  .priv_data_size = sizeof(VPlayerContext),
128  .read_seek2 = vplayer_read_seek,
130  .extensions = "txt",
131 };
vplayer_probe
static int vplayer_probe(const AVProbeData *p)
Definition: vplayerdec.c:34
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
vplayer_read_header
static int vplayer_read_header(AVFormatContext *s)
Definition: vplayerdec.c:58
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:4372
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:32
vplayer_read_packet
static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vplayerdec.c:100
ff_vplayer_demuxer
const AVInputFormat ff_vplayer_demuxer
Definition: vplayerdec.c:121
vplayer_read_seek
static int vplayer_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: vplayerdec.c:106
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
VPlayerContext
Definition: vplayerdec.c:30
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
ss
#define ss(width, name, subs,...)
Definition: cbs_vp9.c:261
ff_subtitles_queue_seek
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
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:616
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:621
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
ff_subtitles_queue_read_packet
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
AVFormatContext
Format I/O context.
Definition: avformat.h:1106
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:979
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
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:441
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:111
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
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:117
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:4797
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
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:198
FFDemuxSubtitlesQueue
Definition: subtitles.h:102
ff_subtitles_queue_clean
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:307
line
Definition: graph2dot.c:48
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
AV_CODEC_ID_VPLAYER
@ AV_CODEC_ID_VPLAYER
Definition: codec_id.h:539
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:832
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
read_ts
static int64_t read_ts(char **line)
Definition: vplayerdec.c:45
VPlayerContext::q
FFDemuxSubtitlesQueue q
Definition: vplayerdec.c:31
subtitles.h
vplayer_read_close
static int vplayer_read_close(AVFormatContext *s)
Definition: vplayerdec.c:114
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:342
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
line
The official guide to swscale for confused that consecutive non overlapping rectangles of slice_bottom special converter These generally are unscaled converters of common like for each output line the vertical scaler pulls lines from a ring buffer When the ring buffer does not contain the wanted line
Definition: swscale.txt:40
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:354