vgmstream/src/meta/gcub.c

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

/* GCUB - found in 'Sega Soccer Slam' */
VGMSTREAM * init_vgmstream_ngc_gcub(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("gcub",filename_extension(filename))) goto fail;

    /* check header */
	if (read_32bitBE(0x00,streamFile) != 0x47437562) /* "GCub" */
		goto fail;

    loop_flag = 0;
    channel_count = read_32bitBE(0x04,streamFile);
    
	/* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(channel_count,loop_flag);
    if (!vgmstream) goto fail;

	/* fill in the vital statistics */
	if (read_32bitBE(0x60,streamFile) == 0x47437878) /* "GCxx" */
	{
		start_offset = 0x88;
	}
	else
	{
		start_offset = 0x60;
	}

	vgmstream->channels = channel_count;
    vgmstream->sample_rate = read_32bitBE(0x08,streamFile);
    vgmstream->coding_type = coding_NGC_DSP;
    vgmstream->num_samples = (read_32bitBE(0x0C,streamFile)-start_offset)/8/channel_count*14;
    if (loop_flag) {
        vgmstream->loop_start_sample = 0;
        vgmstream->loop_end_sample = (read_32bitBE(0x0C,streamFile)-start_offset)/8/channel_count*14;
    }


	if (channel_count == 1)
	{
		vgmstream->layout_type = layout_none;
	}
	else
	{
		vgmstream->layout_type = layout_interleave;
		vgmstream->interleave_block_size = 0x8000; // read_32bitBE(0x04,streamFile);
	}

    vgmstream->meta_type = meta_NGC_GCUB;


    if (vgmstream->coding_type == coding_NGC_DSP) {
        int i;
        for (i=0;i<16;i++) {
            vgmstream->ch[0].adpcm_coef[i] = read_16bitBE(0x10+i*2,streamFile);
        }
        if (vgmstream->channels == 2) {
            for (i=0;i<16;i++) {
                vgmstream->ch[1].adpcm_coef[i] = read_16bitBE(0x30+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;

	/* The first channel */
    vgmstream->ch[0].channel_start_offset=
        vgmstream->ch[0].offset=start_offset;

	/* The second channel */
    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=start_offset+vgmstream->interleave_block_size;
	}
		}
	}

    return vgmstream;

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