116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/*
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* SubRip subtitle decoder
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/parseutils.h"
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#include "avcodec.h"
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#include "ass.h"
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#include "htmlsubtitles.h"
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static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst,
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const char *in, int x1, int y1, int x2, int y2)
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{
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if (x1 >= 0 && y1 >= 0) {
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/* XXX: here we rescale coordinate assuming they are in DVD resolution
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* (720x480) since we don't have anything better */
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if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) {
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/* text rectangle defined, write the text at the center of the rectangle */
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const int cx = x1 + (x2 - x1)/2;
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const int cy = y1 + (y2 - y1)/2;
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const int scaled_x = cx * ASS_DEFAULT_PLAYRESX / 720;
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const int scaled_y = cy * ASS_DEFAULT_PLAYRESY / 480;
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av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y);
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} else {
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/* only the top left corner, assume the text starts in that corner */
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const int scaled_x = x1 * ASS_DEFAULT_PLAYRESX / 720;
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const int scaled_y = y1 * ASS_DEFAULT_PLAYRESY / 480;
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av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y);
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}
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}
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ff_htmlmarkup_to_ass(avctx, dst, in);
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}
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static int srt_decode_frame(AVCodecContext *avctx,
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void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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AVSubtitle *sub = data;
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AVBPrint buffer;
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int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
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int size, ret;
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const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
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if (p && size == 16) {
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x1 = AV_RL32(p );
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y1 = AV_RL32(p + 4);
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x2 = AV_RL32(p + 8);
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y2 = AV_RL32(p + 12);
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}
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if (avpkt->size <= 0)
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return avpkt->size;
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av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
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// Do final divide-by-10 outside rescale to force rounding down.
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ts_start = av_rescale_q(avpkt->pts,
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avctx->time_base,
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(AVRational){1,100});
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ts_end = av_rescale_q(avpkt->pts + avpkt->duration,
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avctx->time_base,
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(AVRational){1,100});
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srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2);
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ret = ff_ass_add_rect_bprint(sub, &buffer, ts_start, ts_end-ts_start);
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av_bprint_finalize(&buffer, NULL);
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if (ret < 0)
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return ret;
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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#if CONFIG_SRT_DECODER
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/* deprecated decoder */
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AVCodec ff_srt_decoder = {
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.name = "srt",
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_SUBRIP,
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.init = ff_ass_subtitle_header_default,
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.decode = srt_decode_frame,
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};
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#endif
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#if CONFIG_SUBRIP_DECODER
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AVCodec ff_subrip_decoder = {
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.name = "subrip",
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.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_SUBRIP,
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.init = ff_ass_subtitle_header_default,
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.decode = srt_decode_frame,
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};
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#endif
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