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