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

/*
ISH+ISD
*/

VGMSTREAM * init_vgmstream_ish_isd(STREAMFILE *streamFile) {

    VGMSTREAM * vgmstream = NULL;
    STREAMFILE * streamFileISH = NULL;
    char filename[PATH_LIMIT];
    char filenameISH[PATH_LIMIT];
    int i;
    int channel_count;
    int loop_flag;

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

    strcpy(filenameISH,filename);
    strcpy(filenameISH+strlen(filenameISH)-3,"ish");

    streamFileISH = streamFile->open(streamFile,filenameISH,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!streamFileISH) goto fail;

    /* check header */
    if (read_32bitBE(0x00,streamFileISH) != 0x495F5346) /* "I_SF" */
        goto fail;
    
    channel_count = read_32bitBE(0x14,streamFileISH);
    loop_flag = (read_32bitBE(0x1C,streamFileISH) !=0);

    /* 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 = read_32bitBE(0x08,streamFileISH);
    vgmstream->num_samples=read_32bitBE(0x0C,streamFileISH);
    vgmstream->coding_type = coding_NGC_DSP;
    if(loop_flag) {
        vgmstream->loop_start_sample = read_32bitBE(0x20,streamFileISH)*14/8/channel_count;
        vgmstream->loop_end_sample = read_32bitBE(0x24,streamFileISH)*14/8/channel_count;
    }	

    if (channel_count == 1) {
        vgmstream->layout_type = layout_none;
    } else if (channel_count == 2) {
        vgmstream->layout_type = layout_interleave;
        vgmstream->interleave_block_size = read_32bitBE(0x18,streamFileISH);
    }

    vgmstream->meta_type = meta_ISH_ISD;
    
    /* open the file for reading by each channel */
    {
        for (i=0;i<channel_count;i++) {
            vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,vgmstream->interleave_block_size);
            
        if (!vgmstream->ch[i].streamfile) goto fail;
            vgmstream->ch[i].channel_start_offset=
            vgmstream->ch[i].offset=i*vgmstream->interleave_block_size;
        }
    }
    
    
    if (vgmstream->coding_type == coding_NGC_DSP) {
        int i;
        for (i=0;i<16;i++) {
            vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(0x40+i*2,streamFileISH);
        }
        if (vgmstream->channels == 2) {
            for (i=0;i<16;i++) {
                vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(0x80+i*2,streamFileISH);
            }
        }
    }

    close_streamfile(streamFileISH); streamFileISH=NULL;
    
    return vgmstream;

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