147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/*
|
|
* 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
|
|
* SAMI subtitle demuxer
|
|
* @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "subtitles.h"
|
|
#include "libavcodec/internal.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/bprint.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
typedef struct {
|
|
FFDemuxSubtitlesQueue q;
|
|
} SAMIContext;
|
|
|
|
static int sami_probe(AVProbeData *p)
|
|
{
|
|
char buf[6];
|
|
FFTextReader tr;
|
|
ff_text_init_buf(&tr, p->buf, p->buf_size);
|
|
ff_text_read(&tr, buf, sizeof(buf));
|
|
|
|
return !strncmp(buf, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0;
|
|
}
|
|
|
|
static int sami_read_header(AVFormatContext *s)
|
|
{
|
|
SAMIContext *sami = s->priv_data;
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
AVBPrint buf, hdr_buf;
|
|
char c = 0;
|
|
int res = 0, got_first_sync_point = 0;
|
|
FFTextReader tr;
|
|
ff_text_init_avio(s, &tr, s->pb);
|
|
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
avpriv_set_pts_info(st, 64, 1, 1000);
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = AV_CODEC_ID_SAMI;
|
|
|
|
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
|
|
while (!ff_text_eof(&tr)) {
|
|
AVPacket *sub;
|
|
const int64_t pos = ff_text_pos(&tr) - (c != 0);
|
|
int is_sync, is_body, n = ff_smil_extract_next_text_chunk(&tr, &buf, &c);
|
|
|
|
if (n == 0)
|
|
break;
|
|
|
|
is_body = !av_strncasecmp(buf.str, "</BODY", 6);
|
|
if (is_body) {
|
|
av_bprint_clear(&buf);
|
|
break;
|
|
}
|
|
|
|
is_sync = !av_strncasecmp(buf.str, "<SYNC", 5);
|
|
if (is_sync)
|
|
got_first_sync_point = 1;
|
|
|
|
if (!got_first_sync_point) {
|
|
av_bprintf(&hdr_buf, "%s", buf.str);
|
|
} else {
|
|
sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync);
|
|
if (!sub) {
|
|
res = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
if (is_sync) {
|
|
const char *p = ff_smil_get_attr_ptr(buf.str, "Start");
|
|
sub->pos = pos;
|
|
sub->pts = p ? strtol(p, NULL, 10) : 0;
|
|
sub->duration = -1;
|
|
}
|
|
}
|
|
av_bprint_clear(&buf);
|
|
}
|
|
|
|
res = avpriv_bprint_to_extradata(st->codec, &hdr_buf);
|
|
if (res < 0)
|
|
goto end;
|
|
|
|
ff_subtitles_queue_finalize(s, &sami->q);
|
|
|
|
end:
|
|
av_bprint_finalize(&buf, NULL);
|
|
return res;
|
|
}
|
|
|
|
static int sami_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
SAMIContext *sami = s->priv_data;
|
|
return ff_subtitles_queue_read_packet(&sami->q, pkt);
|
|
}
|
|
|
|
static int sami_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
|
|
{
|
|
SAMIContext *sami = s->priv_data;
|
|
return ff_subtitles_queue_seek(&sami->q, s, stream_index,
|
|
min_ts, ts, max_ts, flags);
|
|
}
|
|
|
|
static int sami_read_close(AVFormatContext *s)
|
|
{
|
|
SAMIContext *sami = s->priv_data;
|
|
ff_subtitles_queue_clean(&sami->q);
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_sami_demuxer = {
|
|
.name = "sami",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"),
|
|
.priv_data_size = sizeof(SAMIContext),
|
|
.read_probe = sami_probe,
|
|
.read_header = sami_read_header,
|
|
.read_packet = sami_read_packet,
|
|
.read_seek2 = sami_read_seek,
|
|
.read_close = sami_read_close,
|
|
.extensions = "smi,sami",
|
|
};
|