mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-14 21:35:06 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* commit '5c9c305d14730faf2af206e5d519df4948de0ed2': ass: K&R formatting cosmetics Conflicts: libavformat/assdec.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
172 lines
4.6 KiB
C
172 lines
4.6 KiB
C
/*
|
|
* SSA/ASS demuxer
|
|
* Copyright (c) 2008 Michael Niedermayer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "subtitles.h"
|
|
#include "libavcodec/internal.h"
|
|
#include "libavutil/bprint.h"
|
|
|
|
typedef struct ASSContext {
|
|
FFDemuxSubtitlesQueue q;
|
|
} ASSContext;
|
|
|
|
static int ass_probe(AVProbeData *p)
|
|
{
|
|
const char *header = "[Script Info]";
|
|
|
|
if (!memcmp(p->buf, header, strlen(header)) ||
|
|
!memcmp(p->buf + 3, header, strlen(header)))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ass_read_close(AVFormatContext *s)
|
|
{
|
|
ASSContext *ass = s->priv_data;
|
|
ff_subtitles_queue_clean(&ass->q);
|
|
return 0;
|
|
}
|
|
|
|
static int read_ts(const uint8_t *p, int64_t *start, int *duration)
|
|
{
|
|
int64_t end;
|
|
int hh1, mm1, ss1, ms1;
|
|
int hh2, mm2, ss2, ms2;
|
|
|
|
if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
|
|
&hh1, &mm1, &ss1, &ms1,
|
|
&hh2, &mm2, &ss2, &ms2) == 8) {
|
|
end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
|
|
*start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
|
|
*duration = end - *start;
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int64_t get_line(AVBPrint *buf, AVIOContext *pb)
|
|
{
|
|
int64_t pos = avio_tell(pb);
|
|
|
|
av_bprint_clear(buf);
|
|
for (;;) {
|
|
char c = avio_r8(pb);
|
|
if (!c)
|
|
break;
|
|
av_bprint_chars(buf, c, 1);
|
|
if (c == '\n')
|
|
break;
|
|
}
|
|
return pos;
|
|
}
|
|
|
|
static int ass_read_header(AVFormatContext *s)
|
|
{
|
|
ASSContext *ass = s->priv_data;
|
|
AVBPrint header, line;
|
|
int header_remaining, res = 0;
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
avpriv_set_pts_info(st, 64, 1, 100);
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = AV_CODEC_ID_SSA;
|
|
|
|
header_remaining = INT_MAX;
|
|
|
|
av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
|
|
for (;;) {
|
|
int64_t pos = get_line(&line, s->pb);
|
|
|
|
if (!line.str[0]) // EOF
|
|
break;
|
|
|
|
if (!memcmp(line.str, "[Events]", 8))
|
|
header_remaining = 2;
|
|
else if (line.str[0] == '[')
|
|
header_remaining = INT_MAX;
|
|
|
|
if (header_remaining) {
|
|
av_bprintf(&header, "%s", line.str);
|
|
header_remaining--;
|
|
} else {
|
|
int64_t ts_start = AV_NOPTS_VALUE;
|
|
int duration = -1;
|
|
AVPacket *sub;
|
|
|
|
if (read_ts(line.str, &ts_start, &duration) < 0)
|
|
continue;
|
|
sub = ff_subtitles_queue_insert(&ass->q, line.str, line.len, 0);
|
|
if (!sub) {
|
|
res = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
sub->pos = pos;
|
|
sub->pts = ts_start;
|
|
sub->duration = duration;
|
|
}
|
|
}
|
|
|
|
av_bprint_finalize(&line, NULL);
|
|
|
|
res = avpriv_bprint_to_extradata(st->codec, &header);
|
|
if (res < 0)
|
|
goto end;
|
|
|
|
ff_subtitles_queue_finalize(&ass->q);
|
|
|
|
end:
|
|
return res;
|
|
}
|
|
|
|
static int ass_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
ASSContext *ass = s->priv_data;
|
|
return ff_subtitles_queue_read_packet(&ass->q, pkt);
|
|
}
|
|
|
|
static int ass_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
|
|
{
|
|
ASSContext *ass = s->priv_data;
|
|
return ff_subtitles_queue_seek(&ass->q, s, stream_index,
|
|
min_ts, ts, max_ts, flags);
|
|
}
|
|
|
|
AVInputFormat ff_ass_demuxer = {
|
|
.name = "ass",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
|
|
.priv_data_size = sizeof(ASSContext),
|
|
.read_probe = ass_probe,
|
|
.read_header = ass_read_header,
|
|
.read_packet = ass_read_packet,
|
|
.read_close = ass_read_close,
|
|
.read_seek2 = ass_read_seek,
|
|
};
|