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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
* AQTitle subtitles format demuxer
*
* @see http://web.archive.org/web/20070210095721/http://www.volny.cz/aberka/czech/aqt.html
* @see https://trac.annodex.net/wiki/AQTitle
*/
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "subtitles.h"
#include "libavutil/opt.h"
typedef struct {
const AVClass *class;
FFDemuxSubtitlesQueue q;
AVRational frame_rate;
} AQTitleContext;
static int aqt_probe(const AVProbeData *p)
{
int frame;
const char *ptr = p->buf;
if (sscanf(ptr, "-->> %d", &frame) == 1)
return AVPROBE_SCORE_EXTENSION;
return 0;
}
static int aqt_read_header(AVFormatContext *s)
{
AQTitleContext *aqt = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
int new_event = 1;
int64_t pos = 0, frame = AV_NOPTS_VALUE;
AVPacket *sub = NULL;
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, aqt->frame_rate.den, aqt->frame_rate.num);
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_TEXT;
while (!avio_feof(s->pb)) {
char line[4096];
int len = ff_get_line(s->pb, line, sizeof(line));
if (!len)
break;
line[strcspn(line, "\r\n")] = 0;
if (sscanf(line, "-->> %"SCNd64, &frame) == 1) {
new_event = 1;
pos = avio_tell(s->pb);
if (sub) {
if (frame >= sub->pts && (uint64_t)frame - sub->pts < INT64_MAX)
sub->duration = frame - sub->pts;
sub = NULL;
}
} else if (*line) {
if (!new_event) {
sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1);
if (!sub)
return AVERROR(ENOMEM);
}
sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event);
if (!sub)
return AVERROR(ENOMEM);
if (new_event) {
sub->pts = frame;
sub->duration = -1;
sub->pos = pos;
}
new_event = 0;
}
}
ff_subtitles_queue_finalize(s, &aqt->q);
return 0;
}
static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AQTitleContext *aqt = s->priv_data;
return ff_subtitles_queue_read_packet(&aqt->q, pkt);
}
static int aqt_read_seek(AVFormatContext *s, int stream_index,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
AQTitleContext *aqt = s->priv_data;
return ff_subtitles_queue_seek(&aqt->q, s, stream_index,
min_ts, ts, max_ts, flags);
}
static int aqt_read_close(AVFormatContext *s)
{
AQTitleContext *aqt = s->priv_data;
ff_subtitles_queue_clean(&aqt->q);
return 0;
}
#define OFFSET(x) offsetof(AQTitleContext, x)
#define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
static const AVOption aqt_options[] = {
{ "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD },
{ NULL }
};
static const AVClass aqt_class = {
.class_name = "aqtdec",
.item_name = av_default_item_name,
.option = aqt_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFInputFormat ff_aqtitle_demuxer = {
.p.name = "aqtitle",
.p.long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"),
.p.extensions = "aqt",
.p.priv_class = &aqt_class,
.priv_data_size = sizeof(AQTitleContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = aqt_probe,
.read_header = aqt_read_header,
.read_packet = aqt_read_packet,
.read_seek2 = aqt_read_seek,
.read_close = aqt_read_close,
};
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