/* * 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 * (int64_t)ASS_DEFAULT_PLAYRESX / 720; const int scaled_y = cy * (int64_t)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 * (int64_t)ASS_DEFAULT_PLAYRESX / 720; const int scaled_y = y1 * (int64_t)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); // 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