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/*----------------------------------------------------------------------------
*
* File:
* eas_fmsynth.h
*
* Contents and purpose:
* Implements the FM synthesizer functions.
*
* Copyright Sonic Network Inc. 2004
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*----------------------------------------------------------------------------
* Revision Control:
* $Revision: 90 $
* $Date: 2006-07-11 20:18:13 -0700 (Tue, 11 Jul 2006) $
*----------------------------------------------------------------------------
*/
#ifndef fmsynthH
#define fmsynthH
#include "eas_data.h"
#if defined (_FM_SYNTH)
/* FM envelope state */
typedef enum {
eFMEnvelopeStateAttack = 0,
eFMEnvelopeStateDecay,
eFMEnvelopeStateSustain,
eFMEnvelopeStateRelease,
eFMEnvelopeStateMuted,
eFMEnvelopeStateInvalid /* should never be in this state! */
} E_FM_ENVELOPE_STATE;
/*------------------------------------
* S_OPERATOR data structure
*------------------------------------
*/
typedef struct s_operator_tag
{
EAS_I16 pitch; /* operator pitch in cents */
EAS_U16 envGain; /* envelope target */
EAS_I16 baseGain; /* patch gain (inc. vel & key scale) */
EAS_U16 outputGain; /* current output gain */
EAS_U16 envRate; /* calculated envelope rate */
EAS_U8 envState; /* envelope state */
EAS_U8 pad; /* pad to 16-bits */
} S_OPERATOR;
#endif
typedef struct s_fm_voice_tag
{
S_OPERATOR oper[4]; /* operator data */
EAS_I16 voiceGain; /* LFO + channel parameters */
EAS_U16 lfoPhase; /* LFO current phase */
EAS_I16 lfoValue; /* LFO current value */
EAS_U16 lfoDelay; /* keeps track of elapsed delay time */
EAS_I8 pan; /* stereo pan value (-64 to +64) */
EAS_I8 pad; /* reserved to maintain alignment */
} S_FM_VOICE;
#ifdef _FM_EDITOR
extern S_FM_REGION newPatch;
extern S_FM_REGION OriginalPatch;
#endif
extern EAS_U32 freqTable[];
#endif
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