#include <math.h>
#include "meta.h"
#include "../util.h"

VGMSTREAM * init_vgmstream_ngc_adpdtk(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    STREAMFILE * chstreamfile;
    char filename[260];
    
    size_t file_size;
    int i;

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

    /* file size is the only way to determine sample count */
    file_size = get_streamfile_size(streamFile);

    /* .adp files have no header, so all we can do is look for a valid first frame */
    if (read_8bit(0,streamFile)!=read_8bit(2,streamFile) || read_8bit(1,streamFile)!=read_8bit(3,streamFile)) goto fail;

    /* Hopefully we haven't falsely detected something else... */
    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(2,0);    /* always stereo, no loop */
    if (!vgmstream) goto fail;

    vgmstream->num_samples = file_size/32*28;
    vgmstream->sample_rate = 48000;
    vgmstream->coding_type = coding_NGC_DTK;
    vgmstream->layout_type = layout_dtk_interleave;
    vgmstream->meta_type = meta_NGC_ADPDTK;

    /* locality is such that two streamfiles is silly */
    chstreamfile = streamFile->open(streamFile,filename,32*0x400);
    if (!chstreamfile) goto fail;

    for (i=0;i<2;i++) {
        vgmstream->ch[i].channel_start_offset =
            vgmstream->ch[i].offset = 0;

        vgmstream->ch[i].streamfile = chstreamfile;
    }

    return vgmstream;

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