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/*----------------------------------------------------------------------------
*
* File:
* eas_fmengine.h
*
* Contents and purpose:
* Declarations, interfaces, and prototypes for FM synthesize low-level.
*
* 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: 664 $
* $Date: 2007-04-25 13:11:22 -0700 (Wed, 25 Apr 2007) $
*----------------------------------------------------------------------------
*/
/* sentinel */
#ifndef _FMENGINE_H
#define _FMENGINE_H
/* check for split architecture */
#if defined (EAS_SPLIT_HYBRID_SYNTH) || defined(EAS_SPLIT_FM_SYNTH)
#define FM_OFFBOARD
#endif
/* output level to mix buffer (3 = -24dB) */
#define FM_GAIN_SHIFT 3
#define FM_MONO_GAIN_SHIFT 9
/* voice output level for stereo 15 = +6dB */
#define FM_STEREO_PRE_GAIN_SHIFT 11
#define FM_STEREO_POST_GAIN_SHIFT 10
/* modulator input level shift (21 = -30dB) */
#define FM_MODULATOR_INPUT_SHIFT 21
/* feedback control level shift (7 = 0dB) */
#define FM_FEEDBACK_SHIFT 7
/* synth final output level */
#define SYNTH_POST_GAIN_SHIFT 14
/* LFO modulation to gain control */
#define FM_LFO_GAIN_SHIFT 12
/* sine table is always a power of 2 - saves cycles in inner loop */
#define SINE_TABLE_SIZE_IN_BITS 11
#define SINE_TABLE_SIZE 2048
/* operator structure for FM engine */
typedef struct
{
EAS_U32 phase; /* current waveform phase */
EAS_U16 gain; /* current internal gain */
EAS_U16 outputGain; /* current output gain */
} S_FM_ENG_OPER;
typedef struct
{
S_FM_ENG_OPER oper[4]; /* operator data */
EAS_I16 op1Out; /* op1 output for feedback loop */
EAS_I16 op3Out; /* op3 output for feedback loop */
EAS_U16 voiceGain; /* LFO + channel parameters */
#if (NUM_OUTPUT_CHANNELS == 2)
EAS_U16 gainLeft; /* left gain multiplier */
EAS_U16 gainRight; /* right gain multiplier */
#endif
EAS_U8 flags; /* mode bits and noise waveform flags */
EAS_U8 feedback; /* feedback for Op1 and Op3 */
} S_FM_ENG_VOICE;
typedef struct
{
EAS_U16 gain[4]; /* initial operator gain value */
EAS_U16 outputGain[4]; /* initial operator output gain value */
EAS_U16 voiceGain; /* initial voice gain */
EAS_U8 flags; /* mode bits and noise waveform flags */
EAS_U8 feedback; /* feedback for Op1 and Op3 */
#if (NUM_OUTPUT_CHANNELS == 2)
EAS_I8 pan; /* pan value +/-64 */
#endif
} S_FM_VOICE_CONFIG;
typedef struct
{
EAS_U16 gain[4]; /* new operator gain value */
EAS_I16 pitch[4]; /* new pitch value */
EAS_U16 voiceGain; /* new voice gain */
} S_FM_VOICE_FRAME;
/* bit definitions for S_FM_ENG_VOICE.flags */
#define FLAG_FM_ENG_VOICE_OP1_NOISE 0x10 /* operator 1 source is PRNG */
#define FLAG_FM_ENG_VOICE_OP2_NOISE 0x20 /* operator 2 source is PRNG */
#define FLAG_FM_ENG_VOICE_OP3_NOISE 0x40 /* operator 3 source is PRNG */
#define FLAG_FM_ENG_VOICE_OP4_NOISE 0x80 /* operator 4 source is PRNG */
#ifdef FM_OFFBOARD
extern EAS_BOOL FM_StartFrame (EAS_FRAME_BUFFER_HANDLE pFrameBuffer);
extern EAS_BOOL FM_EndFrame (EAS_FRAME_BUFFER_HANDLE pFrameBuffe, EAS_I32 *pMixBuffer, EAS_I16 masterGain);
#endif
/* FM engine prototypes */
extern void FM_ConfigVoice (EAS_I32 voiceNum, S_FM_VOICE_CONFIG *vCfg, EAS_FRAME_BUFFER_HANDLE pFrameBuffer);
extern void FM_ProcessVoice (EAS_I32 voiceNum, S_FM_VOICE_FRAME *pFrame, EAS_I32 numSamplesToAdd, EAS_PCM *pTempBuffer, EAS_PCM *pBuffer, EAS_I32 *pMixBuffer, EAS_FRAME_BUFFER_HANDLE pFrameBuffer);
#endif
/* #ifndef _FMENGINE_H */
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