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Initial Commit
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Jeff Farrand
171
common/embeddedaudiosynthesis/arm-hybrid-22k/lib_src/eas_wtengine.h
Executable file
171
common/embeddedaudiosynthesis/arm-hybrid-22k/lib_src/eas_wtengine.h
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/*----------------------------------------------------------------------------
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*
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* File:
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* eas_wtengine.h
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*
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* Contents and purpose:
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* This file defines the interface for wavetable synthesis engine
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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: 818 $
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* $Date: 2007-08-02 15:19:41 -0700 (Thu, 02 Aug 2007) $
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*----------------------------------------------------------------------------
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*/
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#ifndef _EAS_WTENGINE_H
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#define _EAS_WTENGINE_H
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/* option sanity check */
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#if defined(_OPTIMIZED_MONO) && defined(_FILTER_ENABLED)
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#error "Incompatible build settings: _OPTIMIZED_MONO cannot be used with _FILTER_ENABLED"
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#endif
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#if defined(_OPTIMIZED_MONO) && (NUM_OUTPUT_CHANNELS != 1)
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#error "Incompatible build settings: _OPTIMIZED_MONO can only be used with NUM_OUTPUT_CHANNELS = 1"
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#endif
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#include "eas_wt_IPC_frame.h"
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/*----------------------------------------------------------------------------
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* defines
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*----------------------------------------------------------------------------
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*/
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#define WT_NOISE_GENERATOR 0xffffffff
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/*----------------------------------------------------------------------------
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* typedefs
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*----------------------------------------------------------------------------
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*/
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/*----------------------------------------------------------------------------
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* S_WT_INT_FRAME
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*
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* This structure includes S_WT_FRAME plus the bus mixing
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* parameters for the internal voices.
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*----------------------------------------------------------------------------
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*/
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typedef struct s_wt_int_frame_tag
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{
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S_WT_FRAME frame;
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EAS_PCM *pAudioBuffer;
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EAS_I32 *pMixBuffer;
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EAS_I32 numSamples;
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EAS_I32 prevGain;
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} S_WT_INT_FRAME;
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#if defined(_FILTER_ENABLED)
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/*----------------------------------------------------------------------------
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* S_FILTER_CONTROL data structure
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*----------------------------------------------------------------------------
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*/
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typedef struct s_filter_control_tag
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{
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EAS_I16 z1; /* 1 sample delay state variable */
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EAS_I16 z2; /* 2 sample delay state variable */
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} S_FILTER_CONTROL;
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#endif
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/*------------------------------------
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* S_LFO_CONTROL data structure
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*------------------------------------
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*/
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typedef struct s_lfo_control_tag
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{
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EAS_I16 lfoValue; /* LFO current output value */
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EAS_I16 lfoPhase; /* LFO current phase */
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} S_LFO_CONTROL;
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/* bit definitions for S_WT_VOICE:flags */
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#define WT_FLAGS_ADPCM_NIBBLE 1 /* high/low nibble flag */
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#define WT_FLAGS_ADPCM_READY 2 /* first 2 samples are decoded */
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#define WT_FLAGS_USE_ADPCM 4 /* sample is ADPCM encoded */
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/* eg1State and eg2State */
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typedef enum {
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eEnvelopeStateInit = 0,
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eEnvelopeStateDelay,
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eEnvelopeStateAttack,
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eEnvelopeStateHold,
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eEnvelopeStateDecay,
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eEnvelopeStateSustain,
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eEnvelopeStateRelease,
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eEnvelopeStateMuting,
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eEnvelopeStateMuted,
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eEnvelopeStateInvalid /* should never be in this state! */
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} E_ENVELOPE_STATE;
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#define DEFAULT_EG1_STATE eEnvelopeStateAttack
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#define DEFAULT_EG1_VALUE 0
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#define DEFAULT_EG1_INCREMENT 0
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#define DEFAULT_EG2_STATE eEnvelopeStateAttack
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#define DEFAULT_EG2_VALUE 0
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#define DEFAULT_EG2_INCREMENT 0
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/*----------------------------------------------------------------------------
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* S_WT_VOICE
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*
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* This structure contains state data for the wavetable engine
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*----------------------------------------------------------------------------
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*/
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typedef struct s_wt_voice_tag
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{
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EAS_U32 loopEnd; /* points to last PCM sample (not 1 beyond last) */
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EAS_U32 loopStart; /* points to first sample at start of loop */
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EAS_U32 phaseAccum; /* current sample, integer portion of phase */
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EAS_U32 phaseFrac; /* fractional portion of phase */
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#if (NUM_OUTPUT_CHANNELS == 2)
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EAS_I16 gainLeft; /* current gain, left ch */
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EAS_I16 gainRight; /* current gain, right ch */
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#endif
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#if defined(_FILTER_ENABLED)
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S_FILTER_CONTROL filter; /* low pass filter */
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#endif
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S_LFO_CONTROL modLFO; /* modulator LFO */
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#ifdef DLS_SYNTHESIZER
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S_LFO_CONTROL vibLFO; /* vibrato LFO */
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#endif
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/* envelope control */
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EAS_I16 eg1Value;
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EAS_I16 eg2Value;
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EAS_I16 eg1Increment;
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EAS_I16 eg2Increment;
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EAS_U8 eg1State;
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EAS_U8 eg2State;
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EAS_U16 artIndex; /* index to articulation params */
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} S_WT_VOICE;
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/*----------------------------------------------------------------------------
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* prototypes
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*----------------------------------------------------------------------------
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*/
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EAS_BOOL WT_CheckSampleEnd (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pWTIntFrame, EAS_BOOL update);
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void WT_ProcessVoice (S_WT_VOICE *pWTVoice, S_WT_INT_FRAME *pWTIntFrame);
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#ifdef EAS_SPLIT_WT_SYNTH
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void WTE_ConfigVoice (EAS_I32 voiceNum, S_WT_CONFIG *pWTConfig, EAS_FRAME_BUFFER_HANDLE pFrameBuffer);
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void WTE_ProcessVoice (EAS_I32 voiceNum, S_WT_FRAME *pWTParams, EAS_FRAME_BUFFER_HANDLE pFrameBuffer);
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#endif
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#endif
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