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      1 /*----------------------------------------------------------------------------
      2  *
      3  * File:
      4  * eas_wtsynth.h
      5  *
      6  * Contents and purpose:
      7  * This file defines the interface for synthesizer engine
      8  *
      9  * Copyright Sonic Network Inc. 2004
     10 
     11  * Licensed under the Apache License, Version 2.0 (the "License");
     12  * you may not use this file except in compliance with the License.
     13  * You may obtain a copy of the License at
     14  *
     15  *      http://www.apache.org/licenses/LICENSE-2.0
     16  *
     17  * Unless required by applicable law or agreed to in writing, software
     18  * distributed under the License is distributed on an "AS IS" BASIS,
     19  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     20  * See the License for the specific language governing permissions and
     21  * limitations under the License.
     22  *
     23  *----------------------------------------------------------------------------
     24  * Revision Control:
     25  *   $Revision: 82 $
     26  *   $Date: 2006-07-10 11:45:19 -0700 (Mon, 10 Jul 2006) $
     27  *----------------------------------------------------------------------------
     28 */
     29 
     30 #ifndef _EAS_WTSYNTH_H
     31 #define _EAS_WTSYNTH_H
     32 
     33 #include "eas_sndlib.h"
     34 #include "eas_wtengine.h"
     35 
     36 /* adjust the filter cutoff frequency to the sample rate */
     37 #if defined (_SAMPLE_RATE_8000)
     38 #define FILTER_CUTOFF_FREQ_ADJUST       0
     39 #elif defined (_SAMPLE_RATE_16000)
     40 #define FILTER_CUTOFF_FREQ_ADJUST       1200
     41 #elif defined (_SAMPLE_RATE_20000)
     42 #define FILTER_CUTOFF_FREQ_ADJUST       1586
     43 #elif defined (_SAMPLE_RATE_22050)
     44 #define FILTER_CUTOFF_FREQ_ADJUST       1756
     45 #elif defined (_SAMPLE_RATE_24000)
     46 #define FILTER_CUTOFF_FREQ_ADJUST       1902
     47 #elif defined (_SAMPLE_RATE_32000)
     48 #define FILTER_CUTOFF_FREQ_ADJUST       2400
     49 #elif defined (_SAMPLE_RATE_44100)
     50 #define FILTER_CUTOFF_FREQ_ADJUST       2956
     51 #elif defined (_SAMPLE_RATE_48000)
     52 #define FILTER_CUTOFF_FREQ_ADJUST       3102
     53 #else
     54 #error "_SAMPLE_RATE_XXXXX must be defined to valid rate"
     55 #endif
     56 
     57 /* function prototypes */
     58 void WT_UpdateLFO (S_LFO_CONTROL *pLFO, EAS_I16 phaseInc);
     59 
     60 #if defined(_FILTER_ENABLED) || defined(DLS_SYNTHESIZER)
     61 void WT_SetFilterCoeffs (S_WT_INT_FRAME *pIntFrame, EAS_I32 cutoff, EAS_I32 resonance);
     62 #endif
     63 
     64 #endif
     65 
     66 
     67