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