jens
843c6e300c
git-svn-id: http://moon:8086/svn/software/trunk/projects/JaySynth@37 b431acfa-c32f-4a4a-93f1-934dc6c82436
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
// --------------------------------------------------------------
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// --------------------------------------------------------------
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#ifndef _LFO_H_
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#define _LFO_H_
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#include "synth_defs.h"
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#include "noise.h"
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#define LFO_SH_ALPHA 0.002 // S&H smoothing
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#define LFO_KE ((synth_float_t)(1-exp(-1)))
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// --------------------------------------------------------------
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// Types
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// --------------------------------------------------------------
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enum
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{
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LFO_WAVEFORM_SINE,
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LFO_WAVEFORM_COSINE,
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LFO_WAVEFORM_SAW,
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LFO_WAVEFORM_SQUARE,
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LFO_WAVEFORM_TRIANGLE,
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LFO_WAVEFORM_SH_UNI,
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LFO_WAVEFORM_SH_GAUSS,
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LFO_WAVEFORM_ONE_MINUS_SINE,
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LFO_WAVEFORM_ONE_MINUS_COSINE,
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LFO_WAVEFORM_ONE_MINUS_SAW,
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LFO_WAVEFORM_ONE_MINUS_SQUARE,
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LFO_WAVEFORM_ONE_MINUS_TRIANGLE,
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LFO_NUM_WAVEFORMS
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};
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enum
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{
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LFO_PARAM2_WAVEFORM,
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LFO_PARAM2_FREQ,
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LFO_PARAM2_SMOOTH,
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LFO_PARAM2_DELAY,
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LFO_PARAM2_ATTACK,
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LFO_PARAM2_SYMMETRY,
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LFO_NUM_PARAMS
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};
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typedef struct _slfo_t
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{
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synth_float_t param[LFO_NUM_PARAMS];
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synth_float_t fs;
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synth_float_t a, b, y[2], x, dx, out, sh_sample, tri;
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int freq_update_req, sqr;
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synth_float_t *pOut;
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UINT32 bufsize;
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noise_gen_t noise;
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synth_float_t smooth_a, smooth_b;
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UINT32 smooth_is_negative;
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synth_float_t delay_x, delay_dx, attack_y, attack_a;
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synth_float_t gain, offset;
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} lfo_t;
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// --------------------------------------------------------------
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// --------------------------------------------------------------
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// Exported functions
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// --------------------------------------------------------------
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void LFO_Init(lfo_t *pObj, synth_float_t fs);
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void LFO_Free(lfo_t *pObj);
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void LFO_SetFS(lfo_t *pObj, synth_float_t fs);
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void LFO_SetBufsize(lfo_t *pObj, UINT32 bufsize);
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void LFO_Reset(lfo_t *pObj, synth_float_t initial_phase);
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void LFO_Param2Set(lfo_t *pObj, UINT32 type, synth_float_t value);
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synth_float_t* LFO_ProcessDataV(lfo_t *pObj, UINT32 len);
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#if defined(__cplusplus)
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}
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#endif
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// --------------------------------------------------------------
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#endif // _LFO_H_
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