#include "meta.h"
#include "../util.h"

/* PCM (from Ephemeral Fantasia) */
VGMSTREAM * init_vgmstream_pcm(STREAMFILE *streamFile) {

	VGMSTREAM * vgmstream = NULL;
	char filename[260];
	off_t start_offset;

    int loop_flag;
    int channel_count;

	/* check extension, case insensitive */
	streamFile->get_name(streamFile,filename,sizeof(filename));
	if (strcasecmp("pcm",filename_extension(filename))) goto fail;

	/* check header */
    if (read_32bitBE(0x18,streamFile) ==0x00000000) {

		loop_flag = (read_32bitLE(0x02,streamFile)!=0);
		channel_count = 1;
	 
		/* build the VGMSTREAM */
		vgmstream = allocate_vgmstream(channel_count,loop_flag);
		if (!vgmstream) goto fail;

		/* fill in the vital statistics */
		start_offset = 0x200;
		vgmstream->channels = channel_count;
		vgmstream->sample_rate = 32000;
		vgmstream->coding_type = coding_PCM8_SB_int;
		vgmstream->num_samples = read_32bitBE(0x06,streamFile)*2;

		if(loop_flag) {
			vgmstream->loop_start_sample = read_32bitBE(0x03,streamFile)*8;
			vgmstream->loop_end_sample = read_32bitBE(0x06,streamFile)*2;
		}
		vgmstream->layout_type = layout_interleave;
		vgmstream->interleave_block_size = 0x2;
		vgmstream->meta_type = meta_PCM;

	} else if (read_32bitBE(0x410,streamFile) ==0x9CDB0740) {

		loop_flag = (read_32bitLE(0x0C,streamFile)!=0);
		channel_count = 2;
 
		/* build the VGMSTREAM */
		vgmstream = allocate_vgmstream(channel_count,loop_flag);
		if (!vgmstream) goto fail;

		/* fill in the vital statistics */
		start_offset = 0x800;
		vgmstream->channels = channel_count;
		vgmstream->sample_rate = 22050;
		vgmstream->coding_type = coding_PCM16LE;
		vgmstream->num_samples = read_32bitLE(0x4,streamFile);

        if(loop_flag == 1) {
			vgmstream->loop_start_sample = read_32bitLE(0x08,streamFile);
			vgmstream->loop_end_sample = read_32bitLE(0x0C,streamFile);
		}

		vgmstream->layout_type = layout_interleave;
		vgmstream->interleave_block_size = 0x2;
		vgmstream->meta_type = meta_PCM;
	} else if ((read_32bitBE(0x0,streamFile) ==0x786D6402) || 
				(read_32bitBE(0x0,streamFile) ==0x786D6401)) {
		loop_flag = 0;
		channel_count = read_8bit(0x03,streamFile);
 
		/* build the VGMSTREAM */
		vgmstream = allocate_vgmstream(channel_count,loop_flag);
		if (!vgmstream) goto fail;

		/* fill in the vital statistics */
		start_offset = 0x10;
		vgmstream->channels = channel_count;
		vgmstream->sample_rate = (int32_t)(read_16bitLE(0x4,streamFile) & 0x0000ffff);
		vgmstream->coding_type = coding_PCM8_int;
		vgmstream->num_samples = read_32bitLE(0x6,streamFile);

        if(loop_flag == 1) {
			vgmstream->loop_start_sample = read_32bitLE(0x08,streamFile);
			vgmstream->loop_end_sample = read_32bitLE(0x0C,streamFile);
		}

		vgmstream->layout_type = layout_interleave;
		vgmstream->interleave_block_size = 0x8;
		vgmstream->meta_type = meta_PCM;
	} else
		goto fail;

	/* open the file for reading */
	{
		int i;
		STREAMFILE * file;
		file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
		if (!file) goto fail;
		for (i=0;i<channel_count;i++) {
			vgmstream->ch[i].streamfile = file;
			vgmstream->ch[i].channel_start_offset=
              vgmstream->ch[i].offset=start_offset+
              vgmstream->interleave_block_size*i;

		}
	}

	return vgmstream;

  /* clean up anything we may have opened */
fail:
  if (vgmstream) close_vgmstream(vgmstream);
  return NULL;
}