Libav 0.7.1
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00001 /* 00002 * SSA/ASS decoder 00003 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avcodec.h" 00023 #include "ass.h" 00024 00025 static av_cold int ass_decode_init(AVCodecContext *avctx) 00026 { 00027 avctx->subtitle_header = av_malloc(avctx->extradata_size); 00028 if (!avctx->extradata) 00029 return AVERROR(ENOMEM); 00030 memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size); 00031 avctx->subtitle_header_size = avctx->extradata_size; 00032 return 0; 00033 } 00034 00035 static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, 00036 AVPacket *avpkt) 00037 { 00038 const char *ptr = avpkt->data; 00039 int len, size = avpkt->size; 00040 00041 ff_ass_init(data); 00042 00043 while (size > 0) { 00044 len = ff_ass_add_rect(data, ptr, 0, 0/* FIXME: duration */, 1); 00045 if (len < 0) 00046 return len; 00047 ptr += len; 00048 size -= len; 00049 } 00050 00051 *got_sub_ptr = avpkt->size > 0; 00052 return avpkt->size; 00053 } 00054 00055 AVCodec ff_ass_decoder = { 00056 .name = "ass", 00057 .long_name = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"), 00058 .type = AVMEDIA_TYPE_SUBTITLE, 00059 .id = CODEC_ID_SSA, 00060 .init = ass_decode_init, 00061 .decode = ass_decode_frame, 00062 };