/* * Copyright (c) 2012 Clément Bœsch * * 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 */ /** * @file * SubViewer subtitle decoder * @see https://en.wikipedia.org/wiki/SubViewer */ #include "avcodec.h" #include "ass.h" #include "libavutil/bprint.h" static int subviewer_event_to_ass(AVBPrint *buf, const char *p) { while (*p) { if (!strncmp(p, "[br]", 4)) { av_bprintf(buf, "\\N"); p += 4; } else { if (p[0] == '\n' && p[1]) av_bprintf(buf, "\\N"); else if (*p != '\n' && *p != '\r') av_bprint_chars(buf, *p, 1); p++; } } av_bprintf(buf, "\r\n"); return 0; } static int subviewer_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { char c; AVSubtitle *sub = data; const char *ptr = avpkt->data; AVBPrint buf; /* To be removed later */ if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) { av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing " "information). You need to upgrade your libavformat or " "sanitize your packet.\n"); return AVERROR_INVALIDDATA; } av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); // note: no need to rescale pts & duration since they are in the same // timebase as ASS (1/100) if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr)) ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0); *got_sub_ptr = sub->num_rects > 0; av_bprint_finalize(&buf, NULL); return avpkt->size; } AVCodec ff_subviewer_decoder = { .name = "subviewer", .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"), .type = AVMEDIA_TYPE_SUBTITLE, .id = AV_CODEC_ID_SUBVIEWER, .decode = subviewer_decode_frame, .init = ff_ass_subtitle_header_default, };