a2b6703a36
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30097 a1c6a512-1295-4272-9138-f99709370657
134 lines
4.9 KiB
C
134 lines
4.9 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2011 by Michael Sevakis
|
|
*
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#define MIXER_OPTIMIZED_MIX_SAMPLES
|
|
#define MIXER_OPTIMIZED_WRITE_SAMPLES
|
|
static struct emac_context
|
|
{
|
|
unsigned long r[4];
|
|
} emac_context IBSS_ATTR;
|
|
|
|
/* Save emac context affected in ISR */
|
|
static FORCE_INLINE void save_emac_context(void)
|
|
{
|
|
asm volatile (
|
|
"move.l %%macsr, %%d0 \n"
|
|
"move.l %%accext01, %%d1 \n"
|
|
"movclr.l %%acc0, %%a0 \n"
|
|
"movclr.l %%acc1, %%a1 \n"
|
|
"movem.l %%d0-%%d1/%%a0-%%a1, (%0) \n"
|
|
:
|
|
: "a"(&emac_context)
|
|
: "d0", "d1", "a0", "a1");
|
|
}
|
|
|
|
/* Restore emac context affected in ISR */
|
|
static FORCE_INLINE void restore_emac_context(void)
|
|
{
|
|
asm volatile (
|
|
"movem.l (%0), %%d0-%%d1/%%a0-%%a1 \n"
|
|
"move.l %%a1, %%acc1 \n"
|
|
"move.l %%a0, %%acc0 \n"
|
|
"move.l %%d1, %%accext01 \n"
|
|
"move.l %%d0, %%macsr \n"
|
|
:
|
|
: "a"(&emac_context)
|
|
: "d0", "d1", "a0", "a1");
|
|
}
|
|
|
|
/* Mix channels' samples and apply gain factors */
|
|
static FORCE_INLINE void mix_samples(void *out,
|
|
void *src0,
|
|
int32_t src0_amp,
|
|
void *src1,
|
|
int32_t src1_amp,
|
|
size_t size)
|
|
{
|
|
uint32_t s0, s1, s2, s3;
|
|
save_emac_context();
|
|
coldfire_set_macsr(EMAC_ROUND | EMAC_SATURATE);
|
|
|
|
asm volatile (
|
|
"move.l (%1)+, %5 \n"
|
|
"1: \n"
|
|
"movea.w %5, %4 \n"
|
|
"asr.l %10, %5 \n"
|
|
"mac.l %4, %8, %%acc0 \n"
|
|
"mac.l %5, %8, (%2)+, %5, %%acc1 \n"
|
|
"movea.w %5, %4 \n"
|
|
"asr.l %10, %5 \n"
|
|
"mac.l %4, %9, %%acc0 \n"
|
|
"mac.l %5, %9, (%1)+, %5, %%acc1 \n"
|
|
"movclr.l %%acc0, %6 \n"
|
|
"movclr.l %%acc1, %7 \n"
|
|
"swap.w %6 \n"
|
|
"move.w %6, %7 \n"
|
|
"move.l %7, (%0)+ \n"
|
|
"subq.l #4, %3 \n"
|
|
"bhi.b 1b \n"
|
|
: "+a"(out), "+a"(src0), "+a"(src1), "+d"(size),
|
|
"=&a"(s0), "=&d"(s1), "=&d"(s2), "=&d"(s3)
|
|
: "r"(src0_amp), "r"(src1_amp), "d"(16)
|
|
);
|
|
|
|
restore_emac_context();
|
|
}
|
|
|
|
/* Write channel's samples and apply gain factor */
|
|
static FORCE_INLINE void write_samples(void *out,
|
|
void *src,
|
|
int32_t amp,
|
|
size_t size)
|
|
{
|
|
if (LIKELY(amp == MIX_AMP_UNITY))
|
|
{
|
|
/* Channel is unity amplitude */
|
|
memcpy(out, src, size);
|
|
}
|
|
else
|
|
{
|
|
/* Channel needs amplitude cut */
|
|
uint32_t s0, s1, s2, s3;
|
|
save_emac_context();
|
|
coldfire_set_macsr(EMAC_ROUND | EMAC_SATURATE);
|
|
|
|
asm volatile (
|
|
"move.l (%1)+, %4 \n"
|
|
"1: \n"
|
|
"movea.w %4, %3 \n"
|
|
"asr.l %8, %4 \n"
|
|
"mac.l %3, %7, %%acc0 \n"
|
|
"mac.l %4, %7, (%1)+, %4, %%acc1 \n"
|
|
"movclr.l %%acc0, %5 \n"
|
|
"movclr.l %%acc1, %6 \n"
|
|
"swap.w %5 \n"
|
|
"move.w %5, %6 \n"
|
|
"move.l %6, (%0)+ \n"
|
|
"subq.l #4, %2 \n"
|
|
"bhi.b 1b \n"
|
|
: "+a"(out), "+a"(src), "+d"(size),
|
|
"=&a"(s0), "=&d"(s1), "=&d"(s2), "=&d"(s3)
|
|
: "r"(amp), "d"(16)
|
|
);
|
|
|
|
restore_emac_context();
|
|
}
|
|
}
|