vgmstream/src/meta/ngc_nst_dsp.c

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

/* DSP (Animaniacs: The Great Edgar Hunt) */
// NOTE: The second dsp header is just a dummy, both channels
// use the same coef table (0x20)

VGMSTREAM * init_vgmstream_ngc_nst_dsp(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    char filename[PATH_LIMIT];
    off_t start_offset;
    int loop_flag;
		int channel_count;

    /* 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) != read_32bitBE(0x54,streamFile))
        goto fail;
    if (read_32bitBE(0x4,streamFile) != read_32bitBE(0x58,streamFile))
        goto fail;
    if (read_32bitBE(0x8,streamFile) != read_32bitBE(0x5C,streamFile))
        goto fail;
    if (read_32bitBE(0xC,streamFile) != read_32bitBE(0x60,streamFile))
        goto fail;

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

		/* fill in the vital statistics */
    start_offset = 0xAC;
		vgmstream->channels = channel_count;
    vgmstream->sample_rate = read_32bitBE(0x14,streamFile);
    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->num_samples = read_32bitBE(0x8,streamFile);

#if 0
    if (loop_flag) {
        vgmstream->loop_start_sample = 0;
        vgmstream->loop_end_sample = 0;
    }
#endif

    vgmstream->layout_type = layout_interleave;
    vgmstream->interleave_block_size = 0x10;
    vgmstream->meta_type = meta_NGC_NST_DSP;


    if (vgmstream->coding_type == coding_NGC_DSP) {
        int i;
        for (i=0;i<16;i++) {
            vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(0x20+i*2,streamFile);
        }
        if (vgmstream->channels) {
				for (i=0;i<16;i++) {
						vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(0x20+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;

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

        }
    }

    return vgmstream;

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