/*
  * 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
  * Raw subtitles decoder
  */
 
 #include "avcodec.h"
 #include "ass.h"
 #include "libavutil/bprint.h"
 #include "libavutil/opt.h"
 
 typedef struct {
     AVClass *class;

     const char *linebreaks;

     int keep_ass_markup;

     int readorder;

 } TextContext;
 
 #define OFFSET(x) offsetof(TextContext, x)
 #define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
 static const AVOption options[] = {

     { "keep_ass_markup", "Set if ASS tags must be escaped", OFFSET(keep_ass_markup), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags=SD },

     { NULL }
 };
 
 static int text_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_sub_ptr, AVPacket *avpkt)
 {

     int ret = 0;

     AVBPrint buf;
     AVSubtitle *sub = data;
     const char *ptr = avpkt->data;

     TextContext *text = avctx->priv_data;

 
     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);

     if (ptr && avpkt->size > 0 && *ptr) {
         ff_ass_bprint_text_event(&buf, ptr, avpkt->size, text->linebreaks, text->keep_ass_markup);

         ret = ff_ass_add_rect(sub, buf.str, text->readorder++, 0, NULL, NULL);

     }
     av_bprint_finalize(&buf, NULL);

     if (ret < 0)
         return ret;
     *got_sub_ptr = sub->num_rects > 0;

     return avpkt->size;
 }
 

 static void text_flush(AVCodecContext *avctx)
 {
     TextContext *text = avctx->priv_data;

     if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
         text->readorder = 0;

 }
 

 #define DECLARE_CLASS(decname) static const AVClass decname ## _decoder_class = {   \
     .class_name = #decname " decoder",      \
     .item_name  = av_default_item_name,     \
     .option     = decname ## _options,      \
     .version    = LIBAVUTIL_VERSION_INT,    \
 }
 
 #if CONFIG_TEXT_DECODER
 #define text_options options
 DECLARE_CLASS(text);
 

 AVCodec ff_text_decoder = {
     .name           = "text",
     .long_name      = NULL_IF_CONFIG_SMALL("Raw text subtitle"),

     .priv_data_size = sizeof(TextContext),

     .type           = AVMEDIA_TYPE_SUBTITLE,
     .id             = AV_CODEC_ID_TEXT,
     .decode         = text_decode_frame,
     .init           = ff_ass_subtitle_header_default,
     .priv_class     = &text_decoder_class,

     .flush          = text_flush,

 };

 #endif
 

 #if CONFIG_VPLAYER_DECODER || CONFIG_PJS_DECODER || CONFIG_SUBVIEWER1_DECODER || CONFIG_STL_DECODER

 static int linebreak_init(AVCodecContext *avctx)

 {
     TextContext *text = avctx->priv_data;
     text->linebreaks = "|";
     return ff_ass_subtitle_header_default(avctx);
 }
 

 #if CONFIG_VPLAYER_DECODER
 #define vplayer_options options
 DECLARE_CLASS(vplayer);
 

 AVCodec ff_vplayer_decoder = {
     .name           = "vplayer",
     .long_name      = NULL_IF_CONFIG_SMALL("VPlayer subtitle"),

     .priv_data_size = sizeof(TextContext),

     .type           = AVMEDIA_TYPE_SUBTITLE,
     .id             = AV_CODEC_ID_VPLAYER,
     .decode         = text_decode_frame,

     .init           = linebreak_init,

     .priv_class     = &vplayer_decoder_class,

     .flush          = text_flush,

 };
 #endif
 
 #if CONFIG_STL_DECODER
 #define stl_options options
 DECLARE_CLASS(stl);
 
 AVCodec ff_stl_decoder = {
     .name           = "stl",
     .long_name      = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
     .priv_data_size = sizeof(TextContext),
     .type           = AVMEDIA_TYPE_SUBTITLE,
     .id             = AV_CODEC_ID_STL,
     .decode         = text_decode_frame,
     .init           = linebreak_init,
     .priv_class     = &stl_decoder_class,

     .flush          = text_flush,

 };
 #endif

 
 #if CONFIG_PJS_DECODER
 #define pjs_options options
 DECLARE_CLASS(pjs);
 
 AVCodec ff_pjs_decoder = {
     .name           = "pjs",
     .long_name      = NULL_IF_CONFIG_SMALL("PJS subtitle"),

     .priv_data_size = sizeof(TextContext),

     .type           = AVMEDIA_TYPE_SUBTITLE,
     .id             = AV_CODEC_ID_PJS,
     .decode         = text_decode_frame,
     .init           = linebreak_init,
     .priv_class     = &pjs_decoder_class,

     .flush          = text_flush,

 };
 #endif
 

 #if CONFIG_SUBVIEWER1_DECODER
 #define subviewer1_options options
 DECLARE_CLASS(subviewer1);
 
 AVCodec ff_subviewer1_decoder = {
     .name           = "subviewer1",
     .long_name      = NULL_IF_CONFIG_SMALL("SubViewer1 subtitle"),

     .priv_data_size = sizeof(TextContext),

     .type           = AVMEDIA_TYPE_SUBTITLE,
     .id             = AV_CODEC_ID_SUBVIEWER1,
     .decode         = text_decode_frame,
     .init           = linebreak_init,
     .priv_class     = &subviewer1_decoder_class,

     .flush          = text_flush,

 };
 #endif
 

 #endif /* text subtitles with '|' line break */