text: #include "meta.h"
  #include "../util.h"
  
  /* WAV+DCS
  
  	2008-12-06 - manakoAT : Evil Twin - Cypriens Chronicles...
  	2008-12-07 - manakoAT : Added a function to read the Header file and for 
  							retrieving the channels/frequency, Frequency starts
  							always at a "data" chunk - 0x0C bytes, Channels
  							always - 0x0E bytes...
  */
  
  VGMSTREAM * init_vgmstream_dc_wav_dcs(STREAMFILE *streamFile) {
  
  	VGMSTREAM * vgmstream = NULL;
      STREAMFILE * streamFileWAV = NULL;
      char filename[260];
  	char filenameWAV[260];
  	int i;
  	int channel_count;
  	int loop_flag;
  	int frequency;
  	int dataBuffer = 0;
  	int Founddata = 0;
  	size_t file_size;
  	off_t current_chunk;
  	
  	/* check extension, case insensitive */
      streamFile->get_name(streamFile,filename,sizeof(filename));
      if (strcasecmp("dcs",filename_extension(filename))) goto fail;
  
  	/* Getting the Header file name... */
  	strcpy(filenameWAV,filename);
  	strcpy(filenameWAV+strlen(filenameWAV)-3,"WAV");
  	
  	/* Look if the Header file is present, else cancel vgmstream */
  	streamFileWAV = streamFile->open(streamFile,filenameWAV,STREAMFILE_DEFAULT_BUFFER_SIZE);
  	if (!streamFileWAV) goto fail;
  
      /* check header */
      if (read_32bitBE(0x00,streamFileWAV) != 0x52494646 || /* "RIFF" */
          read_32bitBE(0x08,streamFileWAV) != 0x57415645 || /* "WAVE" */
          read_32bitBE(0x0C,streamFileWAV) != 0x34582E76 || /* 0x34582E76 */
          read_32bitBE(0x3C,streamFileWAV) != 0x406E616D) /* "@nam" */
      goto fail;
  
      /* scan file until we find a "data" string */
      file_size = get_streamfile_size(streamFileWAV);
  	{
  		current_chunk = 0;
  		/* Start at 0 and loop until we reached the
  		file size, or until we found a "data string */
  		while (!Founddata && current_chunk < file_size) {
  		dataBuffer = (read_32bitBE(current_chunk,streamFileWAV));
  			if (dataBuffer == 0x64617461) { /* "data" */
  				/* if "data" string found, retrieve the needed infos */
  				Founddata = 1;
  				/* We will cancel the search here if we have a match */
  			break;	
  			}
  			/* else we will increase the search offset by 1 */
  			current_chunk = current_chunk + 1;
  		}
  	}
  	
  	if (Founddata == 0) {
  		goto fail;
  	} else if (Founddata == 1) {
  		channel_count = (uint16_t)read_16bitLE(current_chunk-0x0E,streamFileWAV);
          frequency = read_32bitLE(current_chunk-0x0C,streamFileWAV);
  	}
  	
  	loop_flag = 0;
  
      /* Seems we're dealing with a vaild file+header,
  	now we can finally build the VGMSTREAM */
      vgmstream = allocate_vgmstream(channel_count,loop_flag);
      if (!vgmstream) goto fail;
  
      /* fill in the vital statistics */
  	vgmstream->channels = channel_count;
  	vgmstream->sample_rate = frequency;
  	vgmstream->num_samples=(get_streamfile_size(streamFile))*2/channel_count;
  	
  	if(loop_flag) {
  		vgmstream->loop_start_sample = 0;
  		vgmstream->loop_end_sample = (get_streamfile_size(streamFile))*2/channel_count;
  	}	
  
  	switch (channel_count) {
  		case 1:
  			vgmstream->layout_type = layout_none;
  			break;
  		case 2:
  			vgmstream->layout_type = layout_interleave;
  			vgmstream->interleave_block_size = 0x4000;
  			break;
  		default:
  	goto fail;
  	}
  
  	vgmstream->coding_type = coding_AICA;
      vgmstream->meta_type = meta_DC_WAV_DCS;
  	
      /* open the file for reading */
      {
          for (i=0;i<channel_count;i++) {
              vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,0x8000);
              vgmstream->ch[i].offset = 0;
              vgmstream->ch[i].adpcm_step_index = 0x7f;   /* AICA */
              if (!vgmstream->ch[i].streamfile) goto fail;
          }
      }
  
  	close_streamfile(streamFileWAV); streamFileWAV=NULL;
  	
      return vgmstream;
  
      /* clean up anything we may have opened */
  fail:
      if (streamFileWAV) close_streamfile(streamFileWAV);
      if (vgmstream) close_vgmstream(vgmstream);
      return NULL;
  }
  