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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Michael Sevakis (jhMikeS)
*
* 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.
*
****************************************************************************/
#if SPC_NOINTERP
#define SPC_LINEAR_INTERP
static inline int linear_interp( int16_t const* samples, int32_t position )
{
uint32_t f = position;
int32_t y0, y1;
/**
* output = y0 + f*y1 - f*y0
*/
asm volatile (
"move.l %[f], %[y1] \n" /* separate frac and whole */
"and.l #0xfff, %[f] \n"
"asr.l %[sh], %[y1] \n"
"move.l 2(%[s], %[y1].l*2), %[y1] \n" /* y0=upper, y1=lower */
"mac.w %[f]l, %[y1]l, %%acc0 \n" /* %acc0 = f*y1 */
"msac.w %[f]l, %[y1]u, %%acc0 \n" /* %acc0 -= f*y0 */
"swap %[y1] \n" /* separate out y0 and sign extend */
"movea.w %[y1], %[y0] \n"
"movclr.l %%acc0, %[y1] \n" /* fetch, scale down, add y0 */
"asr.l %[sh], %[y1] \n" /* output = y0 + (result >> 12) */
"add.l %[y0], %[y1] \n"
: [f]"+d"(f), [y0]"=&a"(y0), [y1]"=&d"(y1)
: [s]"a"(samples), [sh]"d"(12));
return y1;
}
#define SPC_LINEAR_AMP
static inline int linear_amp( struct voice_t* voice, int output,
int* amp_0, int* amp_1 )
{
asm volatile (
"mac.w %[out]l, %[envx]l, %%acc0"
:
: [out]"r"(output), [envx]"r"(voice->envx));
asm volatile (
"movclr.l %%acc0, %[out] \n"
"asr.l #8, %[out] \n"
"mac.l %[v0], %[out], %%acc0 \n"
"mac.l %[v1], %[out], %%acc1 \n"
"asr.l #3, %[out] \n"
: [out]"+r"(output)
: [v0]"r"((int) voice->volume [0]),
[v1]"r"((int) voice->volume [1]));
asm volatile (
"movclr.l %%acc0, %[a0] \n"
"asr.l #3, %[a0] \n"
"movclr.l %%acc1, %[a1] \n"
"asr.l #3, %[a1] \n"
: [a0]"=d"(*amp_0), [a1]"=d"(*amp_1));
return output;
}
#endif /* SPC_NOINTERP */
#if !SPC_NOECHO
#define SPC_DSP_ECHO_APPLY
/* Echo filter history */
static int32_t fir_buf[FIR_BUF_CNT] IBSS_ATTR_SPC
__attribute__(( aligned(FIR_BUF_ALIGN*1) ));
static inline void echo_init( struct Spc_Dsp* this )
{
/* Initialize mask register with the buffer address mask */
asm volatile ("move.l %0, %%mask" : : "i"(FIR_BUF_MASK));
this->fir.ptr = fir_buf;
this->fir.hist_ptr = &fir_buf [1];
ci->memset( fir_buf, 0, sizeof fir_buf );
}
static inline void echo_apply( struct Spc_Dsp* this, uint8_t* echo_ptr,
int* out_0, int* out_1 )
{
int t0, t1, t2;
t1 = swap_odd_even32( *(int32_t *)echo_ptr );
/* Keep last 8 samples */
*this->fir.ptr = t1;
this->fir.ptr = this->fir.hist_ptr;
asm volatile (
"move.l (%[c]) , %[t2] \n"
"mac.w %[t1]u, %[t2]u, <<, (%[p])+&, %[t0], %%acc0 \n"
"mac.w %[t1]l, %[t2]u, <<, (%[p])& , %[t1], %%acc1 \n"
"mac.w %[t0]u, %[t2]l, << , %%acc0 \n"
"mac.w %[t0]l, %[t2]l, <<, 4(%[c]) , %[t2], %%acc1 \n"
"mac.w %[t1]u, %[t2]u, <<, 4(%[p])& , %[t0], %%acc0 \n"
"mac.w %[t1]l, %[t2]u, <<, 8(%[p])& , %[t1], %%acc1 \n"
"mac.w %[t0]u, %[t2]l, << , %%acc0 \n"
"mac.w %[t0]l, %[t2]l, <<, 8(%[c]) , %[t2], %%acc1 \n"
"mac.w %[t1]u, %[t2]u, <<, 12(%[p])& , %[t0], %%acc0 \n"
"mac.w %[t1]l, %[t2]u, <<, 16(%[p])& , %[t1], %%acc1 \n"
"mac.w %[t0]u, %[t2]l, << , %%acc0 \n"
"mac.w %[t0]l, %[t2]l, <<, 12(%[c]) , %[t2], %%acc1 \n"
"mac.w %[t1]u, %[t2]u, <<, 20(%[p])& , %[t0], %%acc0 \n"
"mac.w %[t1]l, %[t2]u, << , %%acc1 \n"
"mac.w %[t0]u, %[t2]l, << , %%acc0 \n"
"mac.w %[t0]l, %[t2]l, << , %%acc1 \n"
: [t0]"=&r"(t0), [t1]"+r"(t1), [t2]"=&r"(t2),
[p]"+a"(this->fir.hist_ptr)
: [c]"a"(this->fir.coeff));
asm volatile (
"movclr.l %%acc0, %[o0] \n"
"movclr.l %%acc1, %[o1] \n"
"mac.l %[ev0], %[o0], >>, %%acc2 \n" /* echo volume */
"mac.l %[ev1], %[o1], >>, %%acc3 \n"
: [o0]"=&r"(*out_0), [o1]"=&r"(*out_1)
: [ev0]"r"((int) this->r.g.echo_volume_0),
[ev1]"r"((int) this->r.g.echo_volume_1));
}
#define SPC_DSP_ECHO_FEEDBACK
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 )
{
asm volatile (
/* scale echo voices; saturate if overflow */
"mac.l %[sh], %[e1] , %%acc1 \n"
"mac.l %[sh], %[e0] , %%acc0 \n"
/* add scaled output from FIR filter */
"mac.l %[fb1], %[ef], <<, %%acc1 \n"
"mac.l %[fb0], %[ef], <<, %%acc0 \n"
:
: [e0]"d"(echo_0), [e1]"d"(echo_1),
[fb0]"r"(fb_0), [fb1]"r"(fb_1),
[ef]"r"((int)this->r.g.echo_feedback),
[sh]"r"(1 << 9));
/* swap and fetch feedback results */
int t0;
asm volatile(
"move.l #0x00ff00ff, %[t0] \n"
"movclr.l %%acc1, %[e1] \n"
"swap.w %[e1] \n"
"movclr.l %%acc0, %[e0] \n"
"move.w %[e1], %[e0] \n"
"and.l %[e0], %[t0] \n"
"eor.l %[t0], %[e0] \n"
"lsl.l #8, %[t0] \n"
"lsr.l #8, %[e0] \n"
"or.l %[e0], %[t0] \n"
: [e0]"=&d"(echo_0), [e1]"=&d"(echo_1),
[t0]"=&d"(t0));
/* save final feedback into echo buffer */
*(int32_t *)echo_ptr = t0;
}
#define SPC_DSP_GENERATE_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 )
{
asm volatile (
"mac.l %[ch0], %[gv0], %%acc2 \n" /* global volume */
"mac.l %[ch1], %[gv1], %%acc3 \n"
:
: [ch0]"r"(chans_0), [gv0]"r"(global_vol_0),
[ch1]"r"(chans_1), [gv1]"r"(global_vol_1));
asm volatile (
"movclr.l %%acc2, %[a0] \n" /* fetch mixed output */
"movclr.l %%acc3, %[a1] \n"
"asr.l %[gm], %[a0] \n" /* scale by global_muting shift */
"asr.l %[gm], %[a1] \n"
: [a0]"=&d"(*out_0), [a1]"=&d"(*out_1)
: [gm]"d"(global_muting));
/* scaled echo is stored in %acc2 and %acc3 */
(void)this; (void)fb_0; (void)fb_1;
}
#endif /* !SPC_NOECHO */
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