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

/* SSM (Golden Gashbell Full Power GC) */
VGMSTREAM * init_vgmstream_ngc_ssm(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    off_t start_offset;
    int loop_flag;
	int channel_count;
	int coef1_start;
	int coef2_start;
	int second_channel_start;

    streamFile->get_name(streamFile,filename,sizeof(filename));
    	if (strcasecmp("ssm",filename_extension(filename)))
    goto fail;

    /* check header */
#if 0
    if (read_32bitBE(0x00,streamFile) != 0x0)
	goto fail;
#endif

    loop_flag = (uint32_t)read_16bitBE(0x18,streamFile);
    channel_count = read_32bitBE(0x10,streamFile);
    
	/* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(channel_count,loop_flag);
    if (!vgmstream) goto fail;

	/* fill in the vital statistics */
    start_offset = read_32bitBE(0x0,streamFile);
	vgmstream->channels = channel_count;
    vgmstream->sample_rate = read_32bitBE(0x14,streamFile);
    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->num_samples = read_32bitBE(0x04,streamFile)*14/8/channel_count;
    if (loop_flag) {
        vgmstream->loop_start_sample = read_32bitBE(0x24,streamFile)*14/8/channel_count;
        vgmstream->loop_end_sample = read_32bitBE(0x20,streamFile)*14/8/channel_count;
    }
		vgmstream->layout_type = layout_none;
		vgmstream->meta_type = meta_NGC_SSM;

		/* Retrieveing the coef tables and the start of the second channel*/
		coef1_start = 0x28;
		coef2_start = 0x68;
		second_channel_start = (read_32bitBE(0x04,streamFile)/2)+start_offset;

		{
        int i;
        for (i=0;i<16;i++)
            vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(coef1_start+i*2,streamFile);
		if (channel_count == 2) {
		for (i=0;i<16;i++)
            vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(coef2_start+i*2,streamFile);
    }
		}


    /* 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;

	/* The first channel */
    vgmstream->ch[0].channel_start_offset=
        vgmstream->ch[0].offset=start_offset;

	/* The second channel */
    if (channel_count == 2) {
        vgmstream->ch[1].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);

        if (!vgmstream->ch[1].streamfile) goto fail;

        vgmstream->ch[1].channel_start_offset=
            vgmstream->ch[1].offset=second_channel_start;
		}
	}
    
    }

	return vgmstream;

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