mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
4.1 KiB
116 lines
4.1 KiB
/* |
|
* SubRip subtitle decoder |
|
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
|
* |
|
* 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 "libavutil/avstring.h" |
|
#include "libavutil/common.h" |
|
#include "libavutil/intreadwrite.h" |
|
#include "libavutil/parseutils.h" |
|
#include "avcodec.h" |
|
#include "ass.h" |
|
#include "htmlsubtitles.h" |
|
|
|
static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst, |
|
const char *in, int x1, int y1, int x2, int y2) |
|
{ |
|
if (x1 >= 0 && y1 >= 0) { |
|
/* XXX: here we rescale coordinate assuming they are in DVD resolution |
|
* (720x480) since we don't have anything better */ |
|
|
|
if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) { |
|
/* text rectangle defined, write the text at the center of the rectangle */ |
|
const int cx = x1 + (x2 - x1)/2; |
|
const int cy = y1 + (y2 - y1)/2; |
|
const int scaled_x = cx * ASS_DEFAULT_PLAYRESX / 720; |
|
const int scaled_y = cy * ASS_DEFAULT_PLAYRESY / 480; |
|
av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y); |
|
} else { |
|
/* only the top left corner, assume the text starts in that corner */ |
|
const int scaled_x = x1 * ASS_DEFAULT_PLAYRESX / 720; |
|
const int scaled_y = y1 * ASS_DEFAULT_PLAYRESY / 480; |
|
av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y); |
|
} |
|
} |
|
|
|
ff_htmlmarkup_to_ass(avctx, dst, in); |
|
} |
|
|
|
static int srt_decode_frame(AVCodecContext *avctx, |
|
void *data, int *got_sub_ptr, AVPacket *avpkt) |
|
{ |
|
AVSubtitle *sub = data; |
|
AVBPrint buffer; |
|
int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
|
int size, ret; |
|
const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size); |
|
|
|
if (p && size == 16) { |
|
x1 = AV_RL32(p ); |
|
y1 = AV_RL32(p + 4); |
|
x2 = AV_RL32(p + 8); |
|
y2 = AV_RL32(p + 12); |
|
} |
|
|
|
if (avpkt->size <= 0) |
|
return avpkt->size; |
|
|
|
av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED); |
|
|
|
// TODO: reindent |
|
// Do final divide-by-10 outside rescale to force rounding down. |
|
ts_start = av_rescale_q(avpkt->pts, |
|
avctx->time_base, |
|
(AVRational){1,100}); |
|
ts_end = av_rescale_q(avpkt->pts + avpkt->duration, |
|
avctx->time_base, |
|
(AVRational){1,100}); |
|
|
|
srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2); |
|
ret = ff_ass_add_rect_bprint(sub, &buffer, ts_start, ts_end-ts_start); |
|
av_bprint_finalize(&buffer, NULL); |
|
if (ret < 0) |
|
return ret; |
|
|
|
*got_sub_ptr = sub->num_rects > 0; |
|
return avpkt->size; |
|
} |
|
|
|
#if CONFIG_SRT_DECODER |
|
/* deprecated decoder */ |
|
AVCodec ff_srt_decoder = { |
|
.name = "srt", |
|
.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
|
.type = AVMEDIA_TYPE_SUBTITLE, |
|
.id = AV_CODEC_ID_SUBRIP, |
|
.init = ff_ass_subtitle_header_default, |
|
.decode = srt_decode_frame, |
|
}; |
|
#endif |
|
|
|
#if CONFIG_SUBRIP_DECODER |
|
AVCodec ff_subrip_decoder = { |
|
.name = "subrip", |
|
.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), |
|
.type = AVMEDIA_TYPE_SUBTITLE, |
|
.id = AV_CODEC_ID_SUBRIP, |
|
.init = ff_ass_subtitle_header_default, |
|
.decode = srt_decode_frame, |
|
}; |
|
#endif
|
|
|