/*
  * 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
  * MPL2 subtitles decoder
  *
  * @see http://web.archive.org/web/20090328040233/http://napisy.ussbrowarek.org/mpl2-eng.html
  */
 
 #include "avcodec.h"
 #include "ass.h"
 #include "libavutil/bprint.h"
 
 static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
 {
     if (*p == ' ')
         p++;
 
     while (*p) {
         int got_style = 0;
 
         while (*p && strchr("/\\_", *p)) {
             if      (*p == '/')  av_bprintf(buf, "{\\i1}");
             else if (*p == '\\') av_bprintf(buf, "{\\b1}");
             else if (*p == '_')  av_bprintf(buf, "{\\u1}");
             got_style = 1;
             p++;
         }
 
         while (*p && *p != '|') {
             if (*p != '\r' && *p != '\n')
                 av_bprint_chars(buf, *p, 1);
             p++;
         }
 
         if (*p == '|') {
             if (got_style)
                 av_bprintf(buf, "{\\r}");
             av_bprintf(buf, "\\N");
             p++;
         }
     }
 
     av_bprintf(buf, "\r\n");
     return 0;
 }
 
 static int mpl2_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_sub_ptr, AVPacket *avpkt)
 {
     AVBPrint buf;
     AVSubtitle *sub = data;
     const char *ptr = avpkt->data;
     const int ts_start     = av_rescale_q(avpkt->pts,      avctx->time_base, (AVRational){1,100});
     const int ts_duration  = avpkt->duration != -1 ?
                              av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
 
     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
     if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr)) {
         if (!av_bprint_is_complete(&buf)) {
             av_bprint_finalize(&buf, NULL);
             return AVERROR(ENOMEM);
         }
         ff_ass_add_rect(sub, buf.str, ts_start, ts_duration, 0);
     }
     *got_sub_ptr = sub->num_rects > 0;
     av_bprint_finalize(&buf, NULL);
     return avpkt->size;
 }
 
 AVCodec ff_mpl2_decoder = {
     .name           = "mpl2",
     .long_name      = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
     .type           = AVMEDIA_TYPE_SUBTITLE,
     .id             = AV_CODEC_ID_MPL2,
     .decode         = mpl2_decode_frame,
     .init           = ff_ass_subtitle_header_default,
 };