/*
  * SSA/ASS encoder
  * 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 "avcodec.h"
 #include "libavutil/avstring.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, void *data)
 {
     AVSubtitle *sub = data;
     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("Advanced SubStation Alpha subtitle"),
     .type         = AVMEDIA_TYPE_SUBTITLE,
     .id           = CODEC_ID_SSA,
     .init         = ass_encode_init,
     .encode       = ass_encode_frame,
 };