0,0 → 1,167 |
/* |
* MicroDVD subtitle demuxer |
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
* Copyright (c) 2012 Clément Bœsch <u pkh me> |
* |
* 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 "avformat.h" |
#include "internal.h" |
#include "subtitles.h" |
#include "libavutil/intreadwrite.h" |
|
#define MAX_LINESIZE 2048 |
|
|
typedef struct { |
FFDemuxSubtitlesQueue q; |
} MicroDVDContext; |
|
|
static int microdvd_probe(AVProbeData *p) |
{ |
unsigned char c; |
const uint8_t *ptr = p->buf; |
int i; |
|
if (AV_RB24(ptr) == 0xEFBBBF) |
ptr += 3; /* skip UTF-8 BOM */ |
|
for (i=0; i<3; i++) { |
if (sscanf(ptr, "{%*d}{}%c", &c) != 1 && |
sscanf(ptr, "{%*d}{%*d}%c", &c) != 1 && |
sscanf(ptr, "{DEFAULT}{}%c", &c) != 1) |
return 0; |
ptr += ff_subtitles_next_line(ptr); |
} |
return AVPROBE_SCORE_MAX; |
} |
|
static int64_t get_pts(const char *buf) |
{ |
int frame; |
char c; |
|
if (sscanf(buf, "{%d}{%c", &frame, &c) == 2) |
return frame; |
return AV_NOPTS_VALUE; |
} |
|
static int get_duration(const char *buf) |
{ |
int frame_start, frame_end; |
|
if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2) |
return frame_end - frame_start; |
return -1; |
} |
|
static int microdvd_read_header(AVFormatContext *s) |
{ |
AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */ |
MicroDVDContext *microdvd = s->priv_data; |
AVStream *st = avformat_new_stream(s, NULL); |
int i = 0; |
char line[MAX_LINESIZE]; |
|
if (!st) |
return AVERROR(ENOMEM); |
|
while (!url_feof(s->pb)) { |
char *p = line; |
AVPacket *sub; |
int64_t pos = avio_tell(s->pb); |
int len = ff_get_line(s->pb, line, sizeof(line)); |
|
if (!len) |
break; |
line[strcspn(line, "\r\n")] = 0; |
if (i++ < 3) { |
int frame; |
double fps; |
char c; |
|
if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 || |
sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2) |
&& frame <= 1 && fps > 3 && fps < 100) |
pts_info = av_d2q(fps, 100000); |
if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) { |
st->codec->extradata = av_strdup(line + 11); |
if (!st->codec->extradata) |
return AVERROR(ENOMEM); |
st->codec->extradata_size = strlen(st->codec->extradata) + 1; |
continue; |
} |
} |
#define SKIP_FRAME_ID \ |
p = strchr(p, '}'); \ |
if (!p) { \ |
av_log(s, AV_LOG_WARNING, "Invalid event \"%s\"" \ |
" at line %d\n", line, i); \ |
continue; \ |
} \ |
p++ |
SKIP_FRAME_ID; |
SKIP_FRAME_ID; |
if (!*p) |
continue; |
sub = ff_subtitles_queue_insert(µdvd->q, p, strlen(p), 0); |
if (!sub) |
return AVERROR(ENOMEM); |
sub->pos = pos; |
sub->pts = get_pts(line); |
sub->duration = get_duration(line); |
} |
ff_subtitles_queue_finalize(µdvd->q); |
avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num); |
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
st->codec->codec_id = AV_CODEC_ID_MICRODVD; |
return 0; |
} |
|
static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
MicroDVDContext *microdvd = s->priv_data; |
return ff_subtitles_queue_read_packet(µdvd->q, pkt); |
} |
|
static int microdvd_read_seek(AVFormatContext *s, int stream_index, |
int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
{ |
MicroDVDContext *microdvd = s->priv_data; |
return ff_subtitles_queue_seek(µdvd->q, s, stream_index, |
min_ts, ts, max_ts, flags); |
} |
|
static int microdvd_read_close(AVFormatContext *s) |
{ |
MicroDVDContext *microdvd = s->priv_data; |
ff_subtitles_queue_clean(µdvd->q); |
return 0; |
} |
|
AVInputFormat ff_microdvd_demuxer = { |
.name = "microdvd", |
.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"), |
.priv_data_size = sizeof(MicroDVDContext), |
.read_probe = microdvd_probe, |
.read_header = microdvd_read_header, |
.read_packet = microdvd_read_packet, |
.read_seek2 = microdvd_read_seek, |
.read_close = microdvd_read_close, |
}; |