/*****************************************************************************
*  Copyright Statement:
*  --------------------
*  This software is protected by Copyright and the information contained
*  herein is confidential. The software may not be copied and the information
*  contained herein may not be used or disclosed except with the written
*  permission of MediaTek Inc. (C) 2005
*
*  BY OPENING THIS FILE, BUYER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
*  THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
*  RECEIVED FROM MEDIATEK AND/OR ITS REPRESENTATIVES ARE PROVIDED TO BUYER ON
*  AN "AS-IS" BASIS ONLY. MEDIATEK EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES,
*  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
*  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.
*  NEITHER DOES MEDIATEK PROVIDE ANY WARRANTY WHATSOEVER WITH RESPECT TO THE
*  SOFTWARE OF ANY THIRD PARTY WHICH MAY BE USED BY, INCORPORATED IN, OR
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*****************************************************************************/

/*****************************************************************************
 *
 * Filename:
 * ---------
 *   tonesyn.c
 *
 * Project:
 * --------
 *   Maui_sw
 *
 * Description:
 * ------------
 *   Tone synthesizer utility
 *
 * Author:
 * -------
 * -------
 *============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
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 *------------------------------------------------------------------------------
 * Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *============================================================================
 ****************************************************************************/

#include "common_def.h"
#include "tonesyn.h"

extern int16 my_cos( int32 idx ); // implemented in wav_codec.c

/* 
   freq1 -- the first frequency of DTMF tone
   freq2 -- the second frequency of DTMF tone
   amp   -- amplitude
*/
void ToneSyn_Init( TONESYN *tonesyn, uint16 freq1, uint16 freq2, int16 amp )
{
   tonesyn->amp = amp;
   tonesyn->current_degree1 = 0x4000;      /* PI/2 */
   tonesyn->sample_increment1 = freq1 * 0x10000 / SAMPLE_RATE;
   tonesyn->current_degree2 = 0x4000;      /* PI/2 */
   tonesyn->sample_increment2 = freq2 * 0x10000 / SAMPLE_RATE;
}

int16 ToneSyn_GetSample( TONESYN *tonesyn )
{
   int32 sample;
   sample = ( my_cos( tonesyn->current_degree1 ) + my_cos( tonesyn->current_degree2 ) ) * tonesyn->amp >> 15;
   tonesyn->current_degree1 += tonesyn->sample_increment1;
   tonesyn->current_degree2 += tonesyn->sample_increment2;

   return (int16)sample;
}