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authorMichael Sevakis <jethead71@rockbox.org>2011-06-29 06:37:04 +0000
committerMichael Sevakis <jethead71@rockbox.org>2011-06-29 06:37:04 +0000
commita2b6703a369f6cdbfec1f150c408dadc877631fb (patch)
tree3145a8c1372c44711d38feefeba39c7d4098f139 /firmware/target/arm/pcm-mixer-armv4.c
parent8411614b8a068a4f274c3841aa55aab1df1bc246 (diff)
downloadrockbox-a2b6703a369f6cdbfec1f150c408dadc877631fb.tar.gz
rockbox-a2b6703a369f6cdbfec1f150c408dadc877631fb.zip
Commit FS#12150 - Fully-functional audio mixer - and finally whip old limitations about playback of voice and other sounds when paused. Channels are independent in state and amplitude. Fade on stop/pause is handled by the channel's volume control rather than global volume which means it now works from anywhere. Opens up the possibility of plugin sounds during music playback by merely adding an additional channel enum. If any PCM drivers were not properly modified, see one of the last comments in the task for a description of the simple change that is expected. Some params are tunable in firmware/export/pcm-mixer.h as well.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30097 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/pcm-mixer-armv4.c')
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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
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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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