dsp_biquad.c

// extern Handle dspHandle;

/*
 * filter values:
 *
 * 0 = filterHP32
 * 1 = filterHP47
 * 2 = filterSP32
 * 3 = filterSP47
 */
Result DSP_SetBiquadIirFilter(u8 filter, const u16 *const data)
{
	Result ret = 0;
	u32* cmdbuf = getThreadCommandBuffer();
	cmdbuf[0] = IPC_MakeHeader(0x1C, 2, 2); // 0x001C0082
	cmdbuf[1] = filter;
	cmdbuf[2] = 30;
	cmdbuf[3] = IPC_Desc_Buffer(30, IPC_BUFFER_R);
	cmdbuf[4] = (u32)data;
	if (R_FAILED(ret = svcSendSyncRequest(dspHandle))) return ret;
	return cmdbuf[1];
}