/*
  * SSA/ASS 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 "avcodec.h"
 #include "ass.h"

 #include "ass_split.h"

 
 static av_cold int ass_decode_init(AVCodecContext *avctx)
 {
     avctx->subtitle_header = av_malloc(avctx->extradata_size);

     if (!avctx->subtitle_header)

         return AVERROR(ENOMEM);
     memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
     avctx->subtitle_header_size = avctx->extradata_size;

     avctx->priv_data = ff_ass_split(avctx->extradata);

     if(!avctx->priv_data)
         return -1;

     return 0;
 }
 
 static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
                             AVPacket *avpkt)
 {
     const char *ptr = avpkt->data;
     int len, size = avpkt->size;
 
     while (size > 0) {

         int duration;

         ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL);

         if (!dialog)
             return AVERROR_INVALIDDATA;
         duration = dialog->end - dialog->start;

         len = ff_ass_add_rect(data, ptr, 0, duration, 1);

         if (len < 0)
             return len;
         ptr  += len;
         size -= len;
     }
 
     *got_sub_ptr = avpkt->size > 0;
     return avpkt->size;
 }
 

 static int ass_decode_close(AVCodecContext *avctx)
 {
     ff_ass_split_free(avctx->priv_data);
     avctx->priv_data = NULL;
     return 0;
 }
 

 AVCodec ff_ass_decoder = {

     .name         = "ass",
     .long_name    = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
     .type         = AVMEDIA_TYPE_SUBTITLE,
     .id           = CODEC_ID_SSA,
     .init         = ass_decode_init,
     .decode       = ass_decode_frame,

     .close        = ass_decode_close,

 };