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Diffstat (limited to 'firmware/target/arm/pcm-mixer-armv4.c')
-rw-r--r--firmware/target/arm/pcm-mixer-armv4.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/firmware/target/arm/pcm-mixer-armv4.c b/firmware/target/arm/pcm-mixer-armv4.c
new file mode 100644
index 0000000000..4818544d7b
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+++ b/firmware/target/arm/pcm-mixer-armv4.c
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1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2011 by Michael Sevakis
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21
22#define MIXER_OPTIMIZED_WRITE_SAMPLES
23#define MIXER_OPTIMIZED_MIX_SAMPLES
24
25/* Mix channels' samples and apply gain factors */
26static FORCE_INLINE void mix_samples(void *out,
27 void *src0,
28 int32_t src0_amp,
29 void *src1,
30 int32_t src1_amp,
31 size_t size)
32{
33 if (src0_amp == MIX_AMP_UNITY && src1_amp == MIX_AMP_UNITY)
34 {
35 /* Both are unity amplitude */
36 int32_t l0, l1, h0, h1;
37 asm volatile (
38 "1: \n"
39 "ldrsh %4, [%1], #2 \n"
40 "ldrsh %5, [%2], #2 \n"
41 "ldrsh %6, [%1], #2 \n"
42 "ldrsh %7, [%2], #2 \n"
43 "add %4, %4, %5 \n"
44 "add %6, %6, %7 \n"
45 "mov %5, %4, asr #15 \n"
46 "teq %5, %5, asr #31 \n"
47 "eorne %4, %8, %4, asr #31 \n"
48 "mov %7, %6, asr #15 \n"
49 "teq %7, %7, asr #31 \n"
50 "eorne %6, %8, %6, asr #31 \n"
51 "subs %3, %3, #4 \n"
52 "and %4, %4, %8, lsr #16 \n"
53 "orr %6, %4, %6, lsl #16 \n"
54 "str %6, [%0], #4 \n"
55 "bhi 1b \n"
56 : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size),
57 "=&r"(l0), "=&r"(l1), "=&r"(h0), "=&r"(h1)
58 : "r"(0xffff7fff));
59 }
60 else if (src0_amp != MIX_AMP_UNITY && src1_amp != MIX_AMP_UNITY)
61 {
62 /* Neither are unity amplitude */
63 int32_t l0, l1, h0, h1;
64 asm volatile (
65 "1: \n"
66 "ldrsh %4, [%1], #2 \n"
67 "ldrsh %5, [%2], #2 \n"
68 "ldrsh %6, [%1], #2 \n"
69 "ldrsh %7, [%2], #2 \n"
70 "mul %4, %8, %4 \n"
71 "mul %5, %9, %5 \n"
72 "mul %6, %8, %6 \n"
73 "mul %7, %9, %7 \n"
74 "mov %4, %4, asr #16 \n"
75 "add %4, %4, %5, asr #16 \n"
76 "mov %6, %6, asr #16 \n"
77 "add %6, %6, %7, asr #16 \n"
78 "mov %5, %4, asr #15 \n"
79 "teq %5, %5, asr #31 \n"
80 "eorne %4, %10, %4, asr #31 \n"
81 "mov %7, %6, asr #15 \n"
82 "teq %7, %7, asr #31 \n"
83 "eorne %6, %10, %6, asr #31 \n"
84 "subs %3, %3, #4 \n"
85 "and %4, %4, %10, lsr #16 \n"
86 "orr %6, %4, %6, lsl #16 \n"
87 "str %6, [%0], #4 \n"
88 "bhi 1b \n"
89 : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size),
90 "=&r"(l0), "=&r"(l1), "=&r"(h0), "=&r"(h1)
91 : "r"(src0_amp), "r"(src1_amp), "r"(0xffff7fff));
92 }
93 else
94 {
95 /* One is unity amplitude */
96 if (src0_amp != MIX_AMP_UNITY)
97 {
98 /* Keep unity in src0, amp0 */
99 int16_t *src_tmp = src0;
100 src0 = src1;
101 src1 = src_tmp;
102 src1_amp = src0_amp;
103 src0_amp = MIX_AMP_UNITY;
104 }
105
106 int32_t l0, l1, h0, h1;
107 asm volatile (
108 "1: \n"
109 "ldrsh %4, [%1], #2 \n"
110 "ldrsh %5, [%2], #2 \n"
111 "ldrsh %6, [%1], #2 \n"
112 "ldrsh %7, [%2], #2 \n"
113 "mul %5, %8, %5 \n"
114 "mul %7, %8, %7 \n"
115 "add %4, %4, %5, asr #16 \n"
116 "add %6, %6, %7, asr #16 \n"
117 "mov %5, %4, asr #15 \n"
118 "teq %5, %5, asr #31 \n"
119 "eorne %4, %9, %4, asr #31 \n"
120 "mov %7, %6, asr #15 \n"
121 "teq %7, %7, asr #31 \n"
122 "eorne %6, %9, %6, asr #31 \n"
123 "subs %3, %3, #4 \n"
124 "and %4, %4, %9, lsr #16 \n"
125 "orr %6, %4, %6, lsl #16 \n"
126 "str %6, [%0], #4 \n"
127 "bhi 1b \n"
128 : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size),
129 "=&r"(l0), "=&r"(l1), "=&r"(h0), "=&r"(h1)
130 : "r"(src1_amp), "r"(0xffff7fff));
131 }
132}
133
134/* Write channel's samples and apply gain factor */
135static FORCE_INLINE void write_samples(void *out,
136 void *src,
137 int32_t amp,
138 size_t size)
139{
140 if (LIKELY(amp == MIX_AMP_UNITY))
141 {
142 /* Channel is unity amplitude */
143 asm volatile (
144 "ands r1, %2, #0x1f \n"
145 "beq 2f \n"
146 "1: \n"
147 "ldr r0, [%1], #4 \n"
148 "subs r1, r1, #4 \n"
149 "str r0, [%0], #4 \n"
150 "bne 1b \n"
151 "bics %2, %2, #0x1f \n"
152 "beq 3f \n"
153 "2: \n"
154 "ldmia %1!, { r0-r7 } \n"
155 "subs %2, %2, #32 \n"
156 "stmia %0!, { r0-r7 } \n"
157 "bhi 2b \n"
158 "3: \n"
159 : "+r"(out), "+r"(src), "+r"(size)
160 :
161 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7");
162 }
163 else
164 {
165 /* Channel needs amplitude cut */
166 uint32_t l, h;
167 asm volatile (
168 "1: \n"
169 "ldrsh %3, [%1], #2 \n"
170 "ldrsh %4, [%1], #2 \n"
171 "subs %2, %2, #4 \n"
172 "mul %3, %5, %3 \n"
173 "mul %4, %5, %4 \n"
174 "and %4, %4, %6, lsl #16 \n"
175 "orr %4, %4, %3, lsr #16 \n"
176 "str %4, [%0], #4 \n"
177 "bhi 1b \n"
178 : "+r"(out), "+r"(src), "+r"(size),
179 "=&r"(l), "=&r"(h)
180 : "r"(amp), "r"(0xffffffffu));
181 }
182}
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