/* * SSA/ASS encoder * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <string.h> #include "avcodec.h" #include "libavutil/avstring.h" #include "libavutil/internal.h" #include "libavutil/mem.h" static av_cold int ass_encode_init(AVCodecContext *avctx) { avctx->extradata = av_malloc(avctx->subtitle_header_size); if (!avctx->extradata) return AVERROR(ENOMEM); memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size); avctx->extradata_size = avctx->subtitle_header_size; return 0; } static int ass_encode_frame(AVCodecContext *avctx, unsigned char *buf, int bufsize, const AVSubtitle *sub) { int i, len, total_len = 0; for (i=0; i<sub->num_rects; i++) { if (sub->rects[i]->type != SUBTITLE_ASS) { av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); return -1; } len = av_strlcpy(buf+total_len, sub->rects[i]->ass, bufsize-total_len); if (len > bufsize-total_len-1) { av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); return -1; } total_len += len; } return total_len; } AVCodec ff_ass_encoder = { .name = "ass", .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), .type = AVMEDIA_TYPE_SUBTITLE, .id = AV_CODEC_ID_SSA, .init = ass_encode_init, .encode_sub = ass_encode_frame, };