1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/***************************************************************************
* __________ __ ___.
* 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_WRITE_SAMPLES
#define MIXER_OPTIMIZED_MIX_SAMPLES
/* 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)
{
int32_t s0, s1, tmp;
asm volatile (
"1: \n"
"ldr %4, [%1], #4 \n"
"ldr %5, [%2], #4 \n"
"smulwb %6, %7, %4 \n"
"smulwt %4, %7, %4 \n"
"smlawb %6, %8, %5, %6 \n"
"smlawt %4, %8, %5, %4 \n"
"mov %5, %6, asr #15 \n"
"teq %5, %5, asr #31 \n"
"eorne %6, %9, %6, asr #31 \n"
"mov %5, %4, asr #15 \n"
"teq %5, %5, asr #31 \n"
"eorne %4, %9, %4, asr #31 \n"
"subs %3, %3, #4 \n"
"and %6, %6, %9, lsr #16 \n"
"orr %6, %6, %4, lsl #16 \n"
"str %6, [%0], #4 \n"
"bhi 1b \n"
: "+r"(out), "+r"(src0), "+r"(src1), "+r"(size),
"=&r"(s0), "=&r"(s1), "=&r"(tmp)
: "r"(src0_amp), "r"(src1_amp), "r"(0xffff7fff));
}
/* 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 */
asm volatile (
"ands r1, %2, #0x1f \n"
"beq 2f \n"
"1: \n"
"ldr r0, [%1], #4 \n"
"subs r1, r1, #4 \n"
"str r0, [%0], #4 \n"
"bne 1b \n"
"bics %2, %2, #0x1f \n"
"beq 3f \n"
"2: \n"
"ldmia %1!, { r0-r7 } \n"
"subs %2, %2, #32 \n"
"stmia %0!, { r0-r7 } \n"
"bhi 2b \n"
"3: \n"
: "+r"(out), "+r"(src), "+r"(size)
:
: "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7");
}
else
{
/* Channel needs amplitude cut */
uint32_t l, h;
asm volatile (
"1: \n"
"ldr %3, [%1], #4 \n"
"subs %2, %2, #4 \n"
"smulwt %4, %5, %3 \n"
"smulwb %3, %5, %3 \n"
"mov %4, %4, lsl #16 \n"
"mov %3, %3, lsl #16 \n"
"orr %4, %4, %3, lsr #16 \n"
"str %4, [%0], #4 \n"
"bhi 1b \n"
: "+r"(out), "+r"(src), "+r"(size),
"=&r"(l), "=&r"(h)
: "r"(amp));
}
}
|
