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/* |
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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 int 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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✓✓✓✗
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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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✓✗✓✗
✓✗✓✗
✓✗✓✗
|
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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 * (int64_t)ASS_DEFAULT_PLAYRESX / 720; |
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const int scaled_y = cy * (int64_t)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 * (int64_t)ASS_DEFAULT_PLAYRESX / 720; |
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const int scaled_y = y1 * (int64_t)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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return 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 x1 = -1, y1 = -1, x2 = -1, y2 = -1; |
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int ret; |
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buffer_size_t size; |
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const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size); |
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FFASSDecoderContext *s = avctx->priv_data; |
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✓✓✓✗
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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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✗✓ |
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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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ret = srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2); |
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✓✗ |
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if (ret >= 0) |
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ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL); |
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av_bprint_finalize(&buffer, NULL); |
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✗✓ |
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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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.flush = ff_ass_decoder_flush, |
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.priv_data_size = sizeof(FFASSDecoderContext), |
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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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.flush = ff_ass_decoder_flush, |
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.priv_data_size = sizeof(FFASSDecoderContext), |
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}; |
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#endif |