aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Copyright (c) 2012 Clément Bœsch
*
* 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
*/
/**
* @file
* VPlayer subtitles format demuxer
*/
#include "avformat.h"
#include "internal.h"
#include "subtitles.h"
typedef struct {
FFDemuxSubtitlesQueue q;
} VPlayerContext;
static int vplayer_probe(const AVProbeData *p)
{
char c;
const unsigned char *ptr = p->buf;
if ((sscanf(ptr, "%*3d:%*2d:%*2d.%*2d%c", &c) == 1 ||
sscanf(ptr, "%*3d:%*2d:%*2d%c", &c) == 1) && strchr(": =", c))
return AVPROBE_SCORE_MAX;
return 0;
}
static int64_t read_ts(char **line)
{
char c;
int hh, mm, ss, ms, n, len;
if (((n = sscanf(*line, "%d:%d:%d.%d%c%n", &hh, &mm, &ss, &ms, &c, &len)) >= 5 ||
(n = sscanf(*line, "%d:%d:%d%c%n", &hh, &mm, &ss, &c, &len)) >= 4) && strchr(": =", c)) {
*line += len;
return (hh*3600LL + mm*60LL + ss) * 100LL + (n < 5 ? 0 : ms);
}
return AV_NOPTS_VALUE;
}
static int vplayer_read_header(AVFormatContext *s)
{
VPlayerContext *vplayer = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 100);
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_VPLAYER;
while (!avio_feof(s->pb)) {
char line[4096];
char *p = line;
const int64_t pos = avio_tell(s->pb);
int len = ff_get_line(s->pb, line, sizeof(line));
int64_t pts_start;
if (!len)
break;
line[strcspn(line, "\r\n")] = 0;
pts_start = read_ts(&p);
if (pts_start != AV_NOPTS_VALUE) {
AVPacket *sub;
sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
if (!sub)
return AVERROR(ENOMEM);
sub->pos = pos;
sub->pts = pts_start;
sub->duration = -1;
}
}
ff_subtitles_queue_finalize(s, &vplayer->q);
return 0;
}
static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
{
VPlayerContext *vplayer = s->priv_data;
return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
}
static int vplayer_read_seek(AVFormatContext *s, int stream_index,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
VPlayerContext *vplayer = s->priv_data;
return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
min_ts, ts, max_ts, flags);
}
static int vplayer_read_close(AVFormatContext *s)
{
VPlayerContext *vplayer = s->priv_data;
ff_subtitles_queue_clean(&vplayer->q);
return 0;
}
AVInputFormat ff_vplayer_demuxer = {
.name = "vplayer",
.long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
.priv_data_size = sizeof(VPlayerContext),
.read_probe = vplayer_probe,
.read_header = vplayer_read_header,
.read_packet = vplayer_read_packet,
.read_seek2 = vplayer_read_seek,
.read_close = vplayer_read_close,
.extensions = "txt",
};
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