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

/* If these variables are packed properly in the struct (one after another)
 * then this is actually how they are laid out in the file, albeit big-endian */

struct dsp_header {
    uint32_t sample_count;
    uint32_t nibble_count;
    uint32_t sample_rate;
    uint16_t loop_flag;
    uint16_t format;
    uint32_t loop_start_offset;
    uint32_t loop_end_offset;
    uint32_t ca;
    int16_t coef[16]; /* really 8x2 */
    uint16_t gain;
    uint16_t initial_ps;
    int16_t initial_hist1;
    int16_t initial_hist2;
    uint16_t loop_ps;
    int16_t loop_hist1;
    int16_t loop_hist2;
};

/* nonzero on failure */
static int read_dsp_header(struct dsp_header *header, off_t offset, STREAMFILE *file) {
    int i;
    uint8_t buf[0x4a]; /* usually padded out to 0x60 */
    if (read_streamfile(buf, offset, 0x4a, file) != 0x4a) return 1;

    header->sample_count =
        get_32bitBE(buf+0x00);
    header->nibble_count =
        get_32bitBE(buf+0x04);
    header->sample_rate =
        get_32bitBE(buf+0x08);
    header->loop_flag =
        get_16bitBE(buf+0x0c);
    header->format =
        get_16bitBE(buf+0x0e);
    header->loop_start_offset =
        get_32bitBE(buf+0x10);
    header->loop_end_offset =
        get_32bitBE(buf+0x14);
    header->ca =
        get_32bitBE(buf+0x18);
    for (i=0; i < 16; i++)
        header->coef[i] =
        get_16bitBE(buf+0x1c+i*2);
    header->gain =
        get_16bitBE(buf+0x3c);
    header->initial_ps =
        get_16bitBE(buf+0x3e);
    header->initial_hist1 =
        get_16bitBE(buf+0x40);
    header->initial_hist2 =
        get_16bitBE(buf+0x42);
    header->loop_ps =
        get_16bitBE(buf+0x44);
    header->loop_hist1 =
        get_16bitBE(buf+0x46);
    header->loop_hist2 =
        get_16bitBE(buf+0x48);

    return 0;
}

/* the standard .dsp, as generated by DSPADPCM.exe */

VGMSTREAM * init_vgmstream_ngc_dsp_std(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    struct dsp_header header;
    const off_t start_offset = 0x60;
    int i;

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

    if (read_dsp_header(&header, 0, streamFile)) goto fail;

    /* check initial predictor/scale */
    if (header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (header.format || header.gain)
        goto fail;

    /* Check for a matching second header. If we find one and it checks
     * out thoroughly, we're probably not dealing with a genuine mono DSP.
     * In many cases these will pass all the other checks, including the
     * predictor/scale check if the first byte is 0 */
    {
        struct dsp_header header2;

        read_dsp_header(&header2, 0x60, streamFile);

        if (header.sample_count == header2.sample_count &&
            header.nibble_count == header2.nibble_count &&
            header.sample_rate == header2.sample_rate &&
            header.loop_flag == header2.loop_flag) goto fail;
    }
        
    if (header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = header.loop_start_offset/16*8;
        if (header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
            goto fail;
    }

    /* compare num_samples with nibble count */
    /*
    fprintf(stderr,"num samples (literal): %d\n",read_32bitBE(0,streamFile));
    fprintf(stderr,"num samples (nibbles): %d\n",dsp_nibbles_to_samples(read_32bitBE(4,streamFile)));
    */

    /* build the VGMSTREAM */


    vgmstream = allocate_vgmstream(1,header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = header.sample_count;
    vgmstream->sample_rate = header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            header.loop_end_offset)+1;

    /* don't know why, but it does happen*/
    if (vgmstream->loop_end_sample > vgmstream->num_samples)
        vgmstream->loop_end_sample = vgmstream->num_samples;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_DSP_STD;

    /* coeffs */
    for (i=0;i<16;i++)
        vgmstream->ch[0].adpcm_coef[i] = header.coef[i];
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);

    if (!vgmstream->ch[0].streamfile) goto fail;

    vgmstream->ch[0].channel_start_offset=
        vgmstream->ch[0].offset=start_offset;

    return vgmstream;

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

/* Some very simple stereo variants of standard dsp just use the standard header
 * twice and add interleave, or just concatenate the channels. We'll support
 * them all here.
 * Note that Cstr isn't here, despite using the form of the standard header,
 * because its loop values are wacky. */

/* .stm
 * Used in Paper Mario 2, Fire Emblem: Path of Radiance, Cubivore
 * I suspected that this was an Intelligent Systems format, but its use in
 * Cubivore calls that into question. */
VGMSTREAM * init_vgmstream_ngc_dsp_stm(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    struct dsp_header ch0_header, ch1_header;
    int i;
    int stm_header_sample_rate;
    int channel_count;
    const off_t start_offset = 0x100;
    off_t first_channel_size;
    off_t second_channel_start;

    /* check extension, case insensitive */
    /* to avoid collision with Scream Tracker 2 Modules, also ending in .stm
     * and supported by default in Winamp, it was policy in the old days to
     * rename these files to .dsp */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("stm",filename_extension(filename)) &&
            strcasecmp("dsp",filename_extension(filename))) goto fail;

    /* check intro magic */
    if (read_16bitBE(0, streamFile) != 0x0200) goto fail;

    channel_count = read_32bitBE(4, streamFile);
    /* only stereo and mono are known */
    if (channel_count != 1 && channel_count != 2) goto fail;

    first_channel_size = read_32bitBE(8, streamFile);
    /* this is bad rounding, wastes space, but it looks like that's what's
     * used */
    second_channel_start = ((start_offset+first_channel_size)+0x20)/0x20*0x20;

    /* an additional check */
    stm_header_sample_rate = (uint16_t)read_16bitBE(2, streamFile);

    /* read the DSP headers */
    if (read_dsp_header(&ch0_header, 0x40, streamFile)) goto fail;
    if (channel_count == 2) {
        if (read_dsp_header(&ch1_header, 0xa0, streamFile)) goto fail;
    }

    /* checks for fist channel */
    {
        if (ch0_header.sample_rate != stm_header_sample_rate) goto fail;

        /* check initial predictor/scale */
        if (ch0_header.initial_ps != (uint8_t)read_8bit(start_offset, streamFile))
            goto fail;

        /* check type==0 and gain==0 */
        if (ch0_header.format || ch0_header.gain)
            goto fail;

        if (ch0_header.loop_flag) {
            off_t loop_off;
            /* check loop predictor/scale */
            loop_off = ch0_header.loop_start_offset/16*8;
            if (ch0_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
                goto fail;
        }
    }


    /* checks for second channel */
    if (channel_count == 2) {
        if (ch1_header.sample_rate != stm_header_sample_rate) goto fail;

        /* check for agreement with first channel header */
        if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
           ) goto fail;

        /* check initial predictor/scale */
        if (ch1_header.initial_ps != (uint8_t)read_8bit(second_channel_start, streamFile))
            goto fail;

        /* check type==0 and gain==0 */
        if (ch1_header.format || ch1_header.gain)
            goto fail;

        if (ch1_header.loop_flag) {
            off_t loop_off;
            /* check loop predictor/scale */
            loop_off = ch1_header.loop_start_offset/16*8;
            /*printf("loop_start_offset=%x\nloop_ps=%x\nloop_off=%x\n",ch1_header.loop_start_offset,ch1_header.loop_ps,second_channel_start+loop_off);*/
            if (ch1_header.loop_ps != (uint8_t)read_8bit(second_channel_start+loop_off,streamFile))
                goto fail;
        }
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(channel_count, ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    /* don't know why, but it does happen*/
    if (vgmstream->loop_end_sample > vgmstream->num_samples)
        vgmstream->loop_end_sample = vgmstream->num_samples;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_DSP_STM;

    /* coeffs */
    for (i=0;i<16;i++)
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];

    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;

    if (channel_count == 2) {
        /* coeffs */
        for (i=0;i<16;i++)
            vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];

        /* initial history */
        /* always 0 that I've ever seen, but for completeness... */
        vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
        vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;
    }

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);

    if (!vgmstream->ch[0].streamfile) goto fail;

    vgmstream->ch[0].channel_start_offset=
        vgmstream->ch[0].offset=start_offset;

    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;

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

/* mpdsp: looks like a standard .dsp header, but the data is actually
 * interleaved stereo 
 * The files originally had a .dsp extension, we rename them to .mpdsp so we
 * can catch this.
 */

VGMSTREAM * init_vgmstream_ngc_mpdsp(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    struct dsp_header header;
    const off_t start_offset = 0x60;
    int i;

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

    if (read_dsp_header(&header, 0, streamFile)) goto fail;

    /* none have loop flag set, save us from loop code that involves them */
    if (header.loop_flag) goto fail;

    /* check initial predictor/scale */
    if (header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (header.format || header.gain)
        goto fail;
        
    /* build the VGMSTREAM */


    /* no loop flag, but they do loop */
    vgmstream = allocate_vgmstream(2,0);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = header.sample_count/2;
    vgmstream->sample_rate = header.sample_rate;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0xf000;
    vgmstream->meta_type = meta_DSP_MPDSP;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = header.initial_hist2;

    /* open the file for reading */
    for (i=0;i<2;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=start_offset+
            vgmstream->interleave_block_size*i;
    }

    return vgmstream;

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

/* str: a very simple header format with implicit loop values
 * it's allways in interleaved stereo format
 */
VGMSTREAM * init_vgmstream_ngc_str(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    const off_t start_offset = 0x60;
    int i;

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

	/* always 0xFAAF0001 @ offset 0 */
    if (read_32bitBE(0x00,streamFile)!=0xFAAF0001) goto fail;

    /* build the VGMSTREAM */
    /* always loop & stereo */
    vgmstream = allocate_vgmstream(2,1);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = read_32bitBE(0x08,streamFile);
    vgmstream->sample_rate = read_32bitBE(0x04,streamFile);

	/* always loop to the beginning */
	vgmstream->loop_start_sample=0;
	vgmstream->loop_end_sample=vgmstream->num_samples;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = read_32bitBE(0x0C,streamFile);
    vgmstream->meta_type = meta_DSP_STR;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(0x10+(i*2),streamFile);
        vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(0x30+(i*2),streamFile);
    }
    
    /* open the file for reading */
    for (i=0;i<2;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=start_offset+
            vgmstream->interleave_block_size*i;
    }

    return vgmstream;

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

/* a bunch of formats that are identical except for file extension,
 * but have different interleaves */

VGMSTREAM * init_vgmstream_ngc_dsp_std_int(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    const off_t start_offset = 0xc0;
    off_t interleave;
    int meta_type;

    struct dsp_header ch0_header,ch1_header;

    int i;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strlen(filename) > 7 && !strcasecmp("_lr.dsp",filename+strlen(filename)-7)) {
        /* Bomberman Jetters */
        interleave = 0x14180;
        meta_type = meta_DSP_JETTERS;
    } else if (!strcasecmp("mss",filename_extension(filename))) {
        interleave = 0x1000;
        meta_type = meta_DSP_MSS;
    } else if (!strcasecmp("gcm",filename_extension(filename))) {
        interleave = 0x8000;
        meta_type = meta_DSP_GCM;
    } else goto fail;

    if (read_dsp_header(&ch0_header, 0, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, 0x60, streamFile)) goto fail;

    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(start_offset+interleave,streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        ch1_header.format || ch1_header.gain)
        goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        loop_off = (loop_off/interleave*interleave*2) + (loop_off%interleave);
        if (ch0_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
            goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off+interleave,streamFile))
            goto fail;
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    /* TODO: adjust for interleave? */
    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = interleave;
    vgmstream->meta_type = meta_type;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    for (i=0;i<2;i++) {
        vgmstream->ch[i].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);

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

        vgmstream->ch[i].channel_start_offset=
            vgmstream->ch[i].offset=start_offset+i*interleave;
    }

    return vgmstream;

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

/* sadb - .SAD files, two standard DSP headers */
VGMSTREAM * init_vgmstream_sadb(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    off_t start_offset;
    off_t interleave;

    struct dsp_header ch0_header,ch1_header;
    int i;
    int channel_count;

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

    /* check header magic */
    if (read_32bitBE(0x0,streamFile) != 0x73616462) goto fail; /* "sadb" */

    channel_count = read_8bit(0x32, streamFile);
    if (channel_count != 1 && channel_count != 2) goto fail;

    if (read_dsp_header(&ch0_header, 0x80, streamFile)) goto fail;
    if (channel_count == 2 && read_dsp_header(&ch1_header, 0xe0, streamFile)) goto fail;

    start_offset = read_32bitBE(0x48,streamFile);
    interleave = 16;

    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;
    if (channel_count == 2 && ch1_header.initial_ps != (uint8_t)read_8bit(start_offset+interleave,streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        (channel_count == 2 &&(ch1_header.format || ch1_header.gain)))
        goto fail;

    /* check for agreement */
    if ( channel_count == 2 &&(
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
            )) goto fail;

    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/8/channel_count*8;
        loop_off = (loop_off/interleave*interleave*channel_count) + (loop_off%interleave);
        if (ch0_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
            goto fail;
        if (channel_count == 2 &&
                ch1_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off+interleave,streamFile))
            goto fail;
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(channel_count,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    /* TODO: adjust for interleave? */
    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = channel_count == 2 ? layout_interleave : layout_none;
    vgmstream->interleave_block_size = interleave;
    vgmstream->meta_type = meta_DSP_SADB;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        if (channel_count == 2)
            vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;

    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);

    if (channel_count == 2) {
        vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
        vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;
        vgmstream->ch[1].streamfile = vgmstream->ch[0].streamfile;
    }

    if (!vgmstream->ch[0].streamfile) goto fail;
    /* open the file for reading */
    for (i=0;i<channel_count;i++) {
        vgmstream->ch[i].channel_start_offset=
            vgmstream->ch[i].offset=start_offset+i*interleave;
    }

    return vgmstream;

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

/* AMTS - .amts files */
VGMSTREAM * init_vgmstream_amts(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    off_t start_offset;
    off_t interleave;
	int channel_count;

    struct dsp_header ch0_header,ch1_header;
    int i;

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

    /* check header magic */
    if (read_32bitBE(0x0,streamFile) != 0x414D5453) goto fail; /* "sadb" */
	
	channel_count=read_32bitBE(0x14,streamFile);
    start_offset = 0x800;
    interleave = read_32bitBE(0x08,streamFile);

	if (read_dsp_header(&ch0_header, 0x20, streamFile)) goto fail;

    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;

	if(channel_count==2) {
		if (read_dsp_header(&ch1_header, 0x80, streamFile)) goto fail;

	    if (ch1_header.initial_ps != (uint8_t)read_8bit(start_offset+interleave,streamFile))
		    goto fail;

		/* check type==0 and gain==0 */
		if (ch0_header.format || ch0_header.gain ||
			ch1_header.format || ch1_header.gain)
			goto fail;

		/* check for agreement */
		if (
				ch0_header.sample_count != ch1_header.sample_count ||
				ch0_header.nibble_count != ch1_header.nibble_count ||
				ch0_header.sample_rate != ch1_header.sample_rate ||
				ch0_header.loop_flag != ch1_header.loop_flag ||
				ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
				ch0_header.loop_end_offset != ch1_header.loop_end_offset
		   ) goto fail;

		if (ch0_header.loop_flag) {
			off_t loop_off;
			/* check loop predictor/scale */
			loop_off = ch0_header.loop_start_offset/16*8;
			loop_off = (loop_off/interleave*interleave*2) + (loop_off%interleave);
			if (ch0_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
				goto fail;
			if (ch1_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off+interleave,streamFile))
				goto fail;
		}

	}

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(channel_count,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    /* TODO: adjust for interleave? */
    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = interleave;
    vgmstream->meta_type = meta_DSP_AMTS;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);

	if(channel_count==2) {
		vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
		vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;
		vgmstream->ch[1].streamfile = vgmstream->ch[0].streamfile;
	}

    if (!vgmstream->ch[0].streamfile) goto fail;
    /* open the file for reading */
    for (i=0;i<channel_count;i++) {
        vgmstream->ch[i].channel_start_offset=
            vgmstream->ch[i].offset=start_offset+i*interleave;
    }

    return vgmstream;

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

/* .wsi as found in Alone in the Dark for Wii */
/* These appear to be standard .dsp, but interleaved in a blocked format */

VGMSTREAM * init_vgmstream_wsi(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header header[2];
    off_t start_offset[2];

    int channel_count;
    size_t est_block_size = 0;

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

    /* I don't know if this is actually the channel count, or a block type
       for the first block. Won't know until I see a mono .wsi */
    channel_count = read_32bitBE(0x04,streamFile);

    /* I've only allocated two headers, and I want to be alerted if a mono
      .wsi shows up */
    if (channel_count != 2) goto fail;

    /* check for consistent block headers */
    {
        off_t check_offset;
        off_t block_size_has_been;
        int i;
       
        check_offset = read_32bitBE(0x0,streamFile);
        if (check_offset < 8) goto fail;

        block_size_has_been = check_offset;

        /* check 4 blocks, to get an idea */
        for (i=0;i<4*channel_count;i++) {
            off_t block_size;
            block_size = read_32bitBE(check_offset,streamFile);

            /* expect at least the block header */
            if (block_size < 0x10) goto fail;

            /* expect the channel numbers to alternate */
            if (i%channel_count+1 != read_32bitBE(check_offset+8,streamFile)) goto fail;

            /* expect every block in a set of channels to have the same size */
            if (i%channel_count==0) block_size_has_been = block_size;
            else if (block_size != block_size_has_been) goto fail;

            /* get an estimate of block size for buffer sizing */
            if (block_size > est_block_size) est_block_size = block_size;

            check_offset += block_size;
        }
    }

    /* look at DSP headers */

    {
        off_t check_offset;
        int i;

        check_offset = read_32bitBE(0x0,streamFile);

        for (i=0;i<channel_count;i++) {
            off_t block_size;

            block_size = read_32bitBE(check_offset,streamFile);

            /* make sure block is actually big enough to hold the dsp header
               and beginning of first frame */
            if (block_size < 0x61+0x10) goto fail;
            if (read_dsp_header(&header[i], check_offset+0x10, streamFile)) goto fail;

            start_offset[i] = check_offset + 0x60+0x10;

            /* check initial predictor/scale */
            if (header[i].initial_ps != (uint8_t)read_8bit(check_offset+0x60+0x10,streamFile))
                goto fail;

            /* check type==0 and gain==0 */
            if (header[i].format || header[i].gain)
                goto fail;

#if 0
            /* difficult to use this with blocks, but might be worth doing */
            if (header[i].loop_flag) {
                off_t loop_off;
                /* check loop predictor/scale */
                loop_off = header[i].loop_start_offset/16*8;
                if (header[i].loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
                    goto fail;
            }
#endif

            check_offset += block_size;
        }
    } /* done looking at headers */

    /* check for agreement (two channels only) */
    if (
            header[0].sample_count != header[1].sample_count ||
            header[0].nibble_count != header[1].nibble_count ||
            header[0].sample_rate != header[1].sample_rate ||
            header[0].loop_flag != header[1].loop_flag ||
            header[0].loop_start_offset != header[1].loop_start_offset ||
            header[0].loop_end_offset != header[1].loop_end_offset
       ) goto fail;


    vgmstream = allocate_vgmstream(channel_count,header[0].loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    /* incomplete last frame is missing */
    vgmstream->num_samples = header[0].sample_count/14*14;
    vgmstream->sample_rate = header[0].sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            header[0].loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            header[0].loop_end_offset)+1;

    /* don't know why, but it does happen*/
    if (vgmstream->loop_end_sample > vgmstream->num_samples)
        vgmstream->loop_end_sample = vgmstream->num_samples;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_wsi_blocked;
    vgmstream->meta_type = meta_DSP_WSI;

    /* coeffs */
    {
        int i,j;
        for (j=0;j<channel_count;j++) {
            for (i=0;i<16;i++) {
                vgmstream->ch[j].adpcm_coef[i] = header[j].coef[i];
            }

            /* initial history */
            /* always 0 that I've ever seen, but for completeness... */
            vgmstream->ch[j].adpcm_history1_16 = header[j].initial_hist1;
            vgmstream->ch[j].adpcm_history2_16 = header[j].initial_hist2;
        }
    }


    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,est_block_size*4);

    if (!vgmstream->ch[0].streamfile) goto fail;

    wsi_block_update(read_32bitBE(0,streamFile),vgmstream);

    {
        int i;

        for (i=0;i<channel_count;i++) {
            vgmstream->ch[i].streamfile = vgmstream->ch[0].streamfile;
            vgmstream->ch[i].channel_start_offset=
                vgmstream->ch[i].offset=start_offset[i];
        }

    }

    /* first block isn't full of musics */
    vgmstream->current_block_size -= 0x60;

    return vgmstream;

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


/* SWD (found in Conflict - Desert Storm 1 & 2 */
VGMSTREAM * init_vgmstream_ngc_swd(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    off_t start_offset;
    off_t interleave;

    struct dsp_header ch0_header, ch1_header;
    int i;

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

    if (read_dsp_header(&ch0_header, 0x08, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, 0x68, streamFile)) goto fail;

    /* check header magic */
    if (read_32bitBE(0x00,streamFile) != 0x505346D1) /* PSF\0xD1 */
        goto fail;

    start_offset = 0xC8;
    interleave = 0x8;

#if 0
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(start_offset+interleave,streamFile))
        goto fail;
#endif

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        ch1_header.format || ch1_header.gain)
        goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

#if 0
    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        loop_off = (loop_off/interleave*interleave*2) + (loop_off%interleave);
        if (ch0_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
            goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off+interleave,streamFile))
            goto fail;
    }
#endif

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    /* TODO: adjust for interleave? */
    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = interleave;
    vgmstream->meta_type = meta_NGC_SWD;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    vgmstream->ch[1].streamfile = vgmstream->ch[0].streamfile;

    if (!vgmstream->ch[0].streamfile) goto fail;
    /* open the file for reading */
    for (i=0;i<2;i++) {
        vgmstream->ch[i].channel_start_offset=
            vgmstream->ch[i].offset=start_offset+i*interleave;
    }

    return vgmstream;

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

/* IDSP .gcm files, two standard DSP headers */
/* found in:  Lego Batman (Wii)
              Lego Indiana Jones - The Original Adventures (Wii)
              Lego Indiana Jones 2 - The Adventure Continues (Wii)
              Lego Star Wars - The Complete Saga (Wii)
              The Chronicles of Narnia - Prince Caspian (Wii) */
VGMSTREAM * init_vgmstream_wii_idsp(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    off_t start_offset;
    off_t interleave;
    struct dsp_header ch0_header,ch1_header;
    int i;

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

    /* check header magic */
    if (read_32bitBE(0x0,streamFile) != 0x49445350) goto fail; /* "IDSP" */

    /* different versions? */
    if (read_32bitBE(0x4, streamFile) == 1 &&
            read_32bitBE(0x8, streamFile) == 0xc8)
    {
        if (read_dsp_header(&ch0_header, 0x10, streamFile)) goto fail;
        if (read_dsp_header(&ch1_header, 0x70, streamFile)) goto fail;

        start_offset = 0xd0;
    }
    else if (read_32bitBE(0x4, streamFile) == 2 &&
            read_32bitBE(0x8, streamFile) == 0xd2)
    {
        if (read_dsp_header(&ch0_header, 0x20, streamFile)) goto fail;
        if (read_dsp_header(&ch1_header, 0x80, streamFile)) goto fail;

        start_offset = 0xe0;
    }
    else goto fail;

    interleave = read_32bitBE(0xc, streamFile);

    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(start_offset,streamFile))
        goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(start_offset+interleave,streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        ch1_header.format || ch1_header.gain)
        goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        loop_off = (loop_off/interleave*interleave*2) + (loop_off%interleave);
        if (ch0_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off,streamFile))
            goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(start_offset+loop_off+interleave,streamFile))
            goto fail;
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    /* TODO: adjust for interleave? */
    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = interleave;
    vgmstream->meta_type = meta_DSP_WII_IDSP;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    vgmstream->ch[1].streamfile = vgmstream->ch[0].streamfile;

    if (!vgmstream->ch[0].streamfile) goto fail;
    /* open the file for reading */
    for (i=0;i<2;i++) {
        vgmstream->ch[i].channel_start_offset=
            vgmstream->ch[i].offset=start_offset+i*interleave;
    }

    return vgmstream;

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

/* .wsd files, two DSP files stuck together */
/* found in Phantom Brave Wii */
VGMSTREAM * init_vgmstream_wii_wsd(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    off_t channel_1_start, channel_2_start, channel_1_size, channel_2_size;

    struct dsp_header ch0_header,ch1_header;

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

    /* read .wsd header */
    channel_1_start = read_32bitBE(0x0,streamFile);
    channel_2_start = read_32bitBE(0x4,streamFile);
    channel_1_size = read_32bitBE(0x8,streamFile);
    channel_2_size = read_32bitBE(0xc,streamFile);

    /* check header */
    if (channel_1_size != channel_2_size) goto fail;
    if (channel_1_start != 0x20) goto fail;
    if (channel_1_size < 0x20 || channel_2_size < 0x20) goto fail;
    if (channel_1_start + channel_1_size > channel_2_start) goto fail;
    if (channel_2_start + channel_2_size > get_streamfile_size(streamFile))
        goto fail;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, channel_1_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, channel_2_start, streamFile)) goto fail;

    /* check initial predictor/scale */
    if (ch0_header.initial_ps !=
            (uint8_t)read_8bit(channel_1_start + 0x60, streamFile))
        goto fail;

    if (ch1_header.initial_ps !=
            (uint8_t)read_8bit(channel_2_start + 0x60, streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        ch1_header.format || ch1_header.gain)
        goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        if (ch0_header.loop_ps !=
                (uint8_t)read_8bit(channel_1_start+0x60+loop_off,streamFile))
            goto fail;
        if (ch1_header.loop_ps !=
                (uint8_t)read_8bit(channel_2_start+0x60+loop_off,streamFile))
            goto fail;
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_DSP_WII_WSD;

    /* coeffs */
    {
        int i;
        for (i=0;i<16;i++) {
            vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
            vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
        }
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile) goto fail;

    vgmstream->ch[1].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[1].streamfile) goto fail;

    vgmstream->ch[0].channel_start_offset =
            vgmstream->ch[0].offset=channel_1_start+0x60;
    vgmstream->ch[1].channel_start_offset = 
            vgmstream->ch[1].offset=channel_2_start+0x60;

    return vgmstream;

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


/* .ddsp files, two DSP files stuck together, without additional header */
VGMSTREAM * init_vgmstream_dsp_ddsp(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    off_t channel_1_start, channel_2_start, channel_1_size, channel_2_size;

    struct dsp_header ch0_header,ch1_header;

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

    /* read .wsd header */
    channel_1_start = 0;
    channel_2_start = (get_streamfile_size(streamFile)/2);
    channel_1_size = (get_streamfile_size(streamFile)/2)-0x60;
    channel_2_size = (get_streamfile_size(streamFile)/2)-0x60;

    /* check header */
    if (channel_1_size != channel_2_size) goto fail;
    if (channel_1_start != 0x0) goto fail;
    if (channel_1_size < 0x20 || channel_2_size < 0x20) goto fail;
    if (channel_1_start + channel_1_size > channel_2_start) goto fail;
    if (channel_2_start + channel_2_size > get_streamfile_size(streamFile))
        goto fail;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, channel_1_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, channel_2_start, streamFile)) goto fail;

    /* check initial predictor/scale */
    if (ch0_header.initial_ps !=
            (uint8_t)read_8bit(channel_1_start + 0x60, streamFile))
        goto fail;

    if (ch1_header.initial_ps !=
            (uint8_t)read_8bit(channel_2_start + 0x60, streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        ch1_header.format || ch1_header.gain)
        goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        if (ch0_header.loop_ps !=
                (uint8_t)read_8bit(channel_1_start+0x60+loop_off,streamFile))
            goto fail;
        if (ch1_header.loop_ps !=
                (uint8_t)read_8bit(channel_2_start+0x60+loop_off,streamFile))
            goto fail;
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_DSP_DDSP;

    /* coeffs */
    {
        int i;
        for (i=0;i<16;i++) {
            vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
            vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
        }
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile) goto fail;

    vgmstream->ch[1].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[1].streamfile) goto fail;

    vgmstream->ch[0].channel_start_offset =
            vgmstream->ch[0].offset=channel_1_start+0x60;
    vgmstream->ch[1].channel_start_offset = 
            vgmstream->ch[1].offset=channel_2_start+0x60;

    return vgmstream;

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


/* .was files, DSP file(s), with additional iSWS header */
VGMSTREAM * init_vgmstream_wii_was(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

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

    /* read iSWS header */
    if (read_32bitBE(0x0,streamFile) != 0x69535753)
    	goto fail;

    channel_count = read_32bitBE(0x08,streamFile);

    if (channel_count == 1)
    {

    ch1_header_start = 0x20;
    ch1_start = 0x80;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(1,ch0_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_WII_WAS;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;

    }
    else if (channel_count == 2)
    {


    ch1_header_start = 0x20;
    ch2_header_start = 0x80;
    ch1_start = 0xE0;
    ch2_start = 0xE0 + (read_32bitBE(0x10,streamFile));

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;

        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(ch2_start+loop_off,streamFile))
          goto fail;
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = read_32bitBE(0x10,streamFile);
    vgmstream->meta_type = meta_WII_WAS;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;

    }
    else
    {
      goto fail;
    }
    
    return vgmstream;
    

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


/* .str found in Micro Machines, Superman: Shadow of Apokolips */
VGMSTREAM * init_vgmstream_dsp_str_ig(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

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

    channel_count = 2;

    ch1_header_start = 0x00;
    ch2_header_start = 0x80;
    ch1_start = 0x800;
    ch2_start = 0x4800;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;

        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(ch2_start+loop_off,streamFile))
          goto fail;
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0x4000;
    vgmstream->meta_type = meta_DSP_STR_IG;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;
    
    return vgmstream;
    

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

/* .dsp found in: Speed Challenge - Jacques Villeneuve's Racing Vision (NGC)
                  XIII (NGC)
  always 2 channels, and an interleave of 0x8 */
VGMSTREAM * init_vgmstream_dsp_xiii(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

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

    channel_count = 2;

    ch1_header_start = 0x00;
    ch2_header_start = 0x60;
    ch1_start = 0xC0;
    ch2_start = 0xC8;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            //ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = 0x0; //ch0_header.loop_start_offset/16*8;

        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(ch2_start+loop_off,streamFile))
          goto fail;
    }


    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(2,ch1_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = 0x0; //dsp_nibbles_to_samples(ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0x8;
    vgmstream->meta_type = meta_DSP_XIII;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;
    
    return vgmstream;


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


/* .ndp found in Vertigo (WII) */
VGMSTREAM * init_vgmstream_wii_ndp(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("ndp",filename_extension(filename)))
		  goto fail;
    
    /* check header */
    if (read_32bitBE(0x0,streamFile) != 0x4E445000) /* NDP */
		  goto fail;
    
    /* check size */
    if ((read_32bitLE(0x8,streamFile)+0x18 != get_streamfile_size(streamFile))) /* NDP */
		  goto fail;

    channel_count = (read_16bitLE(0x10,streamFile) != 2);

    ch1_header_start = 0x18;
    ch2_header_start = 0x78;
    ch1_start = 0xD8;
    ch2_start = 0xDC;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;

        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(ch2_start+loop_off,streamFile))
          goto fail;
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave_byte;
    vgmstream->interleave_block_size = 0x4;
    vgmstream->meta_type = meta_WII_NDP;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;
    
    return vgmstream;


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

/* found in "Cabelas" games, always stereo, looped and an interleave of 0x10 bytes */
VGMSTREAM * init_vgmstream_dsp_cabelas(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("dsp",filename_extension(filename)))
		  goto fail;
    
    channel_count = 2;

    ch1_header_start = 0x00;
    ch2_header_start = 0x60;
    ch1_start = 0xC0;
    ch2_start = 0xD0;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;


    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(2,1);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = 0;
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0x10;
    vgmstream->meta_type = meta_DSP_CABELAS;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;
    
    return vgmstream;


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



/* dual dsp header with additional "AAAp" header, found in Vexx (NGC) and Turok: Evolution (NGC) */
VGMSTREAM * init_vgmstream_ngc_dsp_aaap(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("dsp",filename_extension(filename)))
		  goto fail;
    
    /* check header */
    if (read_32bitBE(0x0,streamFile) != 0x41414170) /* AAAp */
		  goto fail;
    
    channel_count = (uint16_t)read_16bitBE(0x6,streamFile);

    ch1_header_start = 0x08;
    ch2_header_start = 0x68;
    ch1_start = 0xC8;
    ch2_start = ch1_start + (uint16_t)read_16bitBE(0x4,streamFile);

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;

        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(ch2_start+loop_off,streamFile))
          goto fail;
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(channel_count,ch0_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = ch2_start-ch1_start;
    vgmstream->meta_type = meta_NGC_DSP_AAAP;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;
    
    return vgmstream;

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


/* .dspw files, two DSP files stuck together */
/* found in Sengoku Basara 3 Wii */
VGMSTREAM * init_vgmstream_dsp_dspw(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];

    off_t channel_1_start, channel_2_start;

    struct dsp_header ch0_header,ch1_header;

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

    if (read_32bitBE(0x0,streamFile) != 0x44535057) // DSPW
      goto fail;

    /* read .dspw header */
    channel_1_start = 0x20;
    channel_2_start = (get_streamfile_size(streamFile)/2)+0x10;

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, channel_1_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, channel_2_start, streamFile)) goto fail;

    /* check initial predictor/scale */
    if (ch0_header.initial_ps !=
            (uint8_t)read_8bit(channel_1_start + 0x60, streamFile))
        goto fail;

    if (ch1_header.initial_ps !=
            (uint8_t)read_8bit(channel_2_start + 0x60, streamFile))
        goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain ||
        ch1_header.format || ch1_header.gain)
        goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag) {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;
        if (ch0_header.loop_ps !=
                (uint8_t)read_8bit(channel_1_start+0x60+loop_off,streamFile))
            goto fail;
        if (ch1_header.loop_ps !=
                (uint8_t)read_8bit(channel_2_start+0x60+loop_off,streamFile))
            goto fail;
    }

    /* build the VGMSTREAM */

    vgmstream = allocate_vgmstream(2,ch0_header.loop_flag);
    if (!vgmstream) goto fail;

    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_DSP_DSPW;

    /* coeffs */
    {
        int i;
        for (i=0;i<16;i++) {
            vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
            vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
        }
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile) goto fail;

    vgmstream->ch[1].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[1].streamfile) goto fail;

    vgmstream->ch[0].channel_start_offset =
            vgmstream->ch[0].offset=channel_1_start+0x60;
    vgmstream->ch[1].channel_start_offset = 
            vgmstream->ch[1].offset=channel_2_start+0x60;

    return vgmstream;

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


/* dual dsp header with additional "iadp" header, found in Dr. Muto (NGC) */
VGMSTREAM * init_vgmstream_ngc_dsp_iadp(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    struct dsp_header ch0_header,ch1_header;
    off_t ch1_header_start, ch2_header_start, ch1_start, ch2_start;
    int channel_count;
    int i;

    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("iadp",filename_extension(filename)))
		  goto fail;
    
    /* check header */
    if (read_32bitBE(0x0,streamFile) != 0x69616470) /* iadp */
		  goto fail;
    
    channel_count = read_32bitBE(0x4,streamFile);
    
    if (channel_count != 0x2)
        goto fail;

    
    ch1_header_start = 0x20;
    ch2_header_start = 0x80;
    ch1_start = read_32bitBE(0x1C,streamFile);
    ch2_start = ch1_start + read_32bitBE(0x8,streamFile);

    /* get DSP headers */
    if (read_dsp_header(&ch0_header, ch1_header_start, streamFile)) goto fail;
    if (read_dsp_header(&ch1_header, ch2_header_start, streamFile)) goto fail;
    
    /* check initial predictor/scale */
    if (ch0_header.initial_ps != (uint8_t)read_8bit(ch1_start, streamFile))
      goto fail;
    if (ch1_header.initial_ps != (uint8_t)read_8bit(ch2_start, streamFile))
      goto fail;

    /* check type==0 and gain==0 */
    if (ch0_header.format || ch0_header.gain)
      goto fail;
    if (ch1_header.format || ch1_header.gain)
      goto fail;

    /* check for agreement */
    if (
            ch0_header.sample_count != ch1_header.sample_count ||
            ch0_header.nibble_count != ch1_header.nibble_count ||
            ch0_header.sample_rate != ch1_header.sample_rate ||
            ch0_header.loop_flag != ch1_header.loop_flag ||
            ch0_header.loop_start_offset != ch1_header.loop_start_offset ||
            ch0_header.loop_end_offset != ch1_header.loop_end_offset
       ) goto fail;

    if (ch0_header.loop_flag)
    {
        off_t loop_off;
        /* check loop predictor/scale */
        loop_off = ch0_header.loop_start_offset/16*8;

        if (ch0_header.loop_ps != (uint8_t)read_8bit(ch1_start+loop_off,streamFile))
          goto fail;
        if (ch1_header.loop_ps != (uint8_t)read_8bit(ch2_start+loop_off,streamFile))
          goto fail;
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(channel_count,ch0_header.loop_flag);
    if (!vgmstream) goto fail;
    
    /* fill in the vital statistics */
    vgmstream->num_samples = ch0_header.sample_count;
    vgmstream->sample_rate = ch0_header.sample_rate;

    vgmstream->loop_start_sample = dsp_nibbles_to_samples(
            ch0_header.loop_start_offset);
    vgmstream->loop_end_sample =  dsp_nibbles_to_samples(
            ch0_header.loop_end_offset)+1;

    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->interleave_block_size = read_32bitBE(0x8,streamFile);
    vgmstream->layout_type = layout_interleave;
    vgmstream->meta_type = meta_NGC_DSP_IADP;

    /* coeffs */
    for (i=0;i<16;i++) {
        vgmstream->ch[0].adpcm_coef[i] = ch0_header.coef[i];
        vgmstream->ch[1].adpcm_coef[i] = ch1_header.coef[i];
    }
    
    /* initial history */
    /* always 0 that I've ever seen, but for completeness... */
    vgmstream->ch[0].adpcm_history1_16 = ch0_header.initial_hist1;
    vgmstream->ch[0].adpcm_history2_16 = ch0_header.initial_hist2;
    vgmstream->ch[1].adpcm_history1_16 = ch1_header.initial_hist1;
    vgmstream->ch[1].adpcm_history2_16 = ch1_header.initial_hist2;

    /* open the file for reading */
    vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!vgmstream->ch[0].streamfile)
    	goto fail;
    vgmstream->ch[0].channel_start_offset = vgmstream->ch[0].offset=ch1_start;
    
    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=ch2_start;
    
    return vgmstream;

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