vgmstream/src/meta/gsp_gsb.c

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

/* GSP+GSB - 2008-11-28 - manakoAT
Super Swing Golf 1 & 2 (WII) */
VGMSTREAM * init_vgmstream_gsp_gsb(STREAMFILE *streamFile) {

    VGMSTREAM * vgmstream = NULL;
    STREAMFILE * streamFileGSP = NULL;
    char filename[PATH_LIMIT];
    char filenameGSP[PATH_LIMIT];
    int channel_count;
    int loop_flag;
    int header_len;
	int i;
	off_t coef1_start;
    off_t coef2_start;
    off_t start_offset;
	
    
    /* check extension, case insensitive */
    streamFile->get_name(streamFile,filename,sizeof(filename));
    if (strcasecmp("gsb",filename_extension(filename))) goto fail;


    strcpy(filenameGSP,filename);
    strcpy(filenameGSP+strlen(filenameGSP)-3,"gsp");

    streamFileGSP = streamFile->open(streamFile,filenameGSP,STREAMFILE_DEFAULT_BUFFER_SIZE);
    if (!streamFileGSP) goto fail;

    /* check header */
    if (read_32bitBE(0x00,streamFileGSP) != 0x47534E44)	/* "GSND" */
        goto fail;

    channel_count = (uint16_t)read_16bitBE(0x3A,streamFileGSP);
    loop_flag = (read_32bitBE(0x64,streamFileGSP) != 0xFFFFFFFF);
    header_len = read_32bitBE(0x1C,streamFileGSP);
    
    coef1_start = header_len-0x4C;
    coef2_start = header_len-0x1C;
    
    /* 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(0x34,streamFileGSP);
    vgmstream->coding_type = coding_NGC_DSP;
    if(loop_flag) {
        vgmstream->loop_start_sample = read_32bitBE(0x64,streamFileGSP);
        vgmstream->loop_end_sample = read_32bitBE(0x68,streamFileGSP);
    }	

    if (channel_count == 1) {
        vgmstream->layout_type = layout_gsb_blocked;
    } else if (channel_count > 1) {
        vgmstream->layout_type = layout_gsb_blocked;
        vgmstream->interleave_block_size = read_32bitBE(header_len-0x64,streamFileGSP);
    }

    vgmstream->meta_type = meta_GSP_GSB;
    
    /* 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(coef1_start+i*2,streamFileGSP);
        }
        if (vgmstream->channels == 2) {
            for (i=0;i<16;i++) {
                vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(coef2_start+i*2,streamFileGSP);
            }
        }
    }

    /* Calc num_samples */
    start_offset = 0x0;
    gsb_block_update(start_offset,vgmstream);
    vgmstream->num_samples=0;

    do {
    
    vgmstream->num_samples += vgmstream->current_block_size*14/8;
        gsb_block_update(vgmstream->next_block_offset,vgmstream);
    } while (vgmstream->next_block_offset<get_streamfile_size(streamFile));

    gsb_block_update(start_offset,vgmstream);

    close_streamfile(streamFileGSP); streamFileGSP=NULL;

    return vgmstream;


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