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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006-2007 Adam Gashlin (hcs)
* Copyright (C) 2004-2007 Shay Green (blargg)
* Copyright (C) 2002 Brad Martin
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
static inline int apply_gen_envx( struct voice_t* voice, int output )
{
return (output * voice->envx) >> 11;
}
static inline int apply_gen_volume( struct voice_t* voice, int output,
int* amp_0, int* amp_1 )
{
*amp_0 = voice->volume [0] * output;
*amp_1 = voice->volume [1] * output;
return output;
}
static inline int apply_gen_amp( struct voice_t* voice, int output,
int* amp_0, int* amp_1)
{
output = apply_gen_envx( voice, output );
output = apply_gen_volume( voice, output, amp_0, amp_1 );
return output;
}
#if !SPC_NOINTERP
#ifndef SPC_GAUSSIAN_FAST_INTERP
static inline int gaussian_fast_interp( int16_t const* samples,
int32_t position,
int16_t const* fwd,
int16_t const* rev )
{
samples += position >> 12;
return (fwd [0] * samples [0] +
fwd [1] * samples [1] +
rev [1] * samples [2] +
rev [0] * samples [3]) >> 11;
}
#endif /* SPC_GAUSSIAN_FAST_INTERP */
#ifndef SPC_GAUSSIAN_FAST_AMP
#define gaussian_fast_amp apply_amp
#endif /* SPC_GAUSSIAN_FAST_AMP */
#ifndef SPC_GAUSSIAN_SLOW_INTERP
static inline int gaussian_slow_interp( int16_t const* samples,
int32_t position,
int16_t const* fwd,
int16_t const* rev )
{
int output;
samples += position >> 12;
output = (fwd [0] * samples [0]) & ~0xFFF;
output = (output + fwd [1] * samples [1]) & ~0xFFF;
output = (output + rev [1] * samples [2]) >> 12;
output = (int16_t) (output * 2);
output += ((rev [0] * samples [3]) >> 12) * 2;
return CLAMP16( output );
}
#endif /* SPC_GAUSSIAN_SLOW_INTERP */
#ifndef SPC_GAUSSIAN_SLOW_AMP
static inline int gaussian_slow_amp( struct voice_t* voice, int output,
int *amp_0, int *amp_1 )
{
output = apply_gen_envx( voice, output ) & ~1;
output = apply_gen_volume( voice, output, amp_0, amp_1 );
return output;
}
#endif /* SPC_GAUSSIAN_SLOW_AMP */
#define interp gaussian_slow_interp
#define apply_amp gaussian_slow_amp
#else /* SPC_NOINTERP */
#ifndef SPC_LINEAR_INTERP
static inline int linear_interp( int16_t const* samples, int32_t position )
{
int32_t fraction = position & 0xfff;
int16_t const* pos = (samples + (position >> 12)) + 1;
return pos[0] + ((fraction * (pos[1] - pos[0])) >> 12);
}
#endif /* SPC_LINEAR_INTERP */
#define interp( samp, pos, fwd, rev ) \
linear_interp( (samp), (pos) )
#ifndef SPC_LINEAR_AMP
#define linear_amp apply_gen_amp
#endif /* SPC_LINEAR_AMP */
#define apply_amp linear_amp
#endif /* SPC_NOINTERP */
#if !SPC_NOECHO
#ifndef SPC_DSP_ECHO_APPLY
/* Init FIR filter */
static inline void echo_init( struct Spc_Dsp* this )
{
this->fir.pos = 0;
ci->memset( this->fir.buf, 0, sizeof this->fir.buf );
}
/* Apply FIR filter */
static inline void echo_apply(struct Spc_Dsp* this,
uint8_t* const echo_ptr, int* out_0, int* out_1)
{
int fb_0 = GET_LE16SA( echo_ptr );
int fb_1 = GET_LE16SA( echo_ptr + 2 );
/* Keep last 8 samples */
int (* const fir_ptr) [2] = this->fir.buf + this->fir.pos;
this->fir.pos = (this->fir.pos + 1) & (FIR_BUF_HALF - 1);
fir_ptr [ 0] [0] = fb_0;
fir_ptr [ 0] [1] = fb_1;
/* duplicate at +8 eliminates wrap checking below */
fir_ptr [FIR_BUF_HALF] [0] = fb_0;
fir_ptr [FIR_BUF_HALF] [1] = fb_1;
fb_0 *= this->fir.coeff [0];
fb_1 *= this->fir.coeff [0];
#define DO_PT( i ) \
fb_0 += fir_ptr [i] [0] * this->fir.coeff [i]; \
fb_1 += fir_ptr [i] [1] * this->fir.coeff [i];
DO_PT( 1 )
DO_PT( 2 )
DO_PT( 3 )
DO_PT( 4 )
DO_PT( 5 )
DO_PT( 6 )
DO_PT( 7 )
#undef DO_PT
*out_0 = fb_0;
*out_1 = fb_1;
}
#endif /* SPC_DSP_ECHO_APPLY */
#ifndef SPC_DSP_ECHO_FEEDBACK
/* Feedback into echo buffer */
static inline void echo_feedback( struct Spc_Dsp* this, uint8_t *echo_ptr,
int echo_0, int echo_1, int fb_0, int fb_1 )
{
int e0 = (echo_0 >> 7) + ((fb_0 * this->r.g.echo_feedback) >> 14);
int e1 = (echo_1 >> 7) + ((fb_1 * this->r.g.echo_feedback) >> 14);
e0 = CLAMP16( e0 );
SET_LE16A( echo_ptr , e0 );
e1 = CLAMP16( e1 );
SET_LE16A( echo_ptr + 2, e1 );
}
#endif /* SPC_DSP_ECHO_FEEDBACK */
#ifndef SPC_DSP_GENERATE_OUTPUT
/* Generate final output */
static inline void echo_output( struct Spc_Dsp* this, int global_muting,
int global_vol_0, int global_vol_1, int chans_0, int chans_1,
int fb_0, int fb_1, int* out_0, int* out_1 )
{
*out_0 = (chans_0 * global_vol_0 + fb_0 * this->r.g.echo_volume_0)
>> global_muting;
*out_1 = (chans_1 * global_vol_1 + fb_1 * this->r.g.echo_volume_1)
>> global_muting;
}
#endif /* SPC_DSP_GENERATE_OUTPUT */
#define mix_output echo_output
#else /* SPC_NOECHO */
#ifndef SPC_DSP_GENERATE_OUTPUT
/* Generate final output */
static inline void noecho_output( struct Spc_Dsp* this, int global_muting,
int global_vol_0, int global_vol_1, int chans_0, int chans_1,
int* out_0, int* out_1 )
{
*out_0 = (chans_0 * global_vol_0) >> global_muting;
*out_1 = (chans_1 * global_vol_1) >> global_muting;
(void)this;
}
#endif /* SPC_DSP_GENERATE_OUTPUT */
#define mix_output(this, gm, gv0, gv1, ch0, ch1, fb_0, fb_1, o0, o1) \
noecho_output( (this), (gm), (gv0), (gv1), (ch0), (ch1), (o0), (o1) )
#endif /* !SPC_NOECHO */
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