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author | Thomas Martitz <kugel@rockbox.org> | 2012-01-06 06:26:48 +0100 |
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committer | Thomas Martitz <kugel@rockbox.org> | 2012-01-22 18:46:45 +0100 |
commit | 3c17f28eca86ff3ee9e7cef6c4d5198c27b7c03c (patch) | |
tree | 672ee79463fc3c20c186f6d34ebd88cbe430c662 /firmware/asm/pcm-mixer.c | |
parent | 991ae1e39553172a7dd6cd8c634aebfce892e261 (diff) | |
download | rockbox-3c17f28eca86ff3ee9e7cef6c4d5198c27b7c03c.tar.gz rockbox-3c17f28eca86ff3ee9e7cef6c4d5198c27b7c03c.zip |
Move pcm_mixer helper routines to firmware/asm.
Diffstat (limited to 'firmware/asm/pcm-mixer.c')
-rw-r--r-- | firmware/asm/pcm-mixer.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/firmware/asm/pcm-mixer.c b/firmware/asm/pcm-mixer.c new file mode 100644 index 0000000000..369e830427 --- /dev/null +++ b/firmware/asm/pcm-mixer.c | |||
@@ -0,0 +1,108 @@ | |||
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 | #if defined(CPU_ARM) | ||
23 | #include "arm/pcm-mixer.c" | ||
24 | #elif defined(CPU_COLDFIRE) | ||
25 | #include "m68k/pcm-mixer.c" | ||
26 | #else | ||
27 | |||
28 | /* generic pcm-mixer.c */ | ||
29 | #include "dsp-util.h" /* for clip_sample_16 */ | ||
30 | /* Mix channels' samples and apply gain factors */ | ||
31 | static FORCE_INLINE void mix_samples(uint32_t *out, | ||
32 | int16_t *src0, | ||
33 | int32_t src0_amp, | ||
34 | int16_t *src1, | ||
35 | int32_t src1_amp, | ||
36 | size_t size) | ||
37 | { | ||
38 | if (src0_amp == MIX_AMP_UNITY && src1_amp == MIX_AMP_UNITY) | ||
39 | { | ||
40 | /* Both are unity amplitude */ | ||
41 | do | ||
42 | { | ||
43 | int32_t l = *src0++ + *src1++; | ||
44 | int32_t h = *src0++ + *src1++; | ||
45 | *out++ = (uint16_t)clip_sample_16(l) | (clip_sample_16(h) << 16); | ||
46 | } | ||
47 | while ((size -= 4) > 0); | ||
48 | } | ||
49 | else if (src0_amp != MIX_AMP_UNITY && src1_amp != MIX_AMP_UNITY) | ||
50 | { | ||
51 | /* Neither are unity amplitude */ | ||
52 | do | ||
53 | { | ||
54 | int32_t l = (*src0++ * src0_amp >> 16) + (*src1++ * src1_amp >> 16); | ||
55 | int32_t h = (*src0++ * src0_amp >> 16) + (*src1++ * src1_amp >> 16); | ||
56 | *out++ = (uint16_t)clip_sample_16(l) | (clip_sample_16(h) << 16); | ||
57 | } | ||
58 | while ((size -= 4) > 0); | ||
59 | } | ||
60 | else | ||
61 | { | ||
62 | /* One is unity amplitude */ | ||
63 | if (src0_amp != MIX_AMP_UNITY) | ||
64 | { | ||
65 | /* Keep unity in src0, amp0 */ | ||
66 | int16_t *src_tmp = src0; | ||
67 | src0 = src1; | ||
68 | src1 = src_tmp; | ||
69 | src1_amp = src0_amp; | ||
70 | src0_amp = MIX_AMP_UNITY; | ||
71 | } | ||
72 | |||
73 | do | ||
74 | { | ||
75 | int32_t l = *src0++ + (*src1++ * src1_amp >> 16); | ||
76 | int32_t h = *src0++ + (*src1++ * src1_amp >> 16); | ||
77 | *out++ = (uint16_t)clip_sample_16(l) | (clip_sample_16(h) << 16); | ||
78 | } | ||
79 | while ((size -= 4) > 0); | ||
80 | } | ||
81 | } | ||
82 | |||
83 | /* Write channel's samples and apply gain factor */ | ||
84 | static FORCE_INLINE void write_samples(uint32_t *out, | ||
85 | int16_t *src, | ||
86 | int32_t amp, | ||
87 | size_t size) | ||
88 | { | ||
89 | if (LIKELY(amp == MIX_AMP_UNITY)) | ||
90 | { | ||
91 | /* Channel is unity amplitude */ | ||
92 | memcpy(out, src, size); | ||
93 | } | ||
94 | else | ||
95 | { | ||
96 | /* Channel needs amplitude cut */ | ||
97 | do | ||
98 | { | ||
99 | int32_t l = *src++ * amp >> 16; | ||
100 | int32_t h = *src++ * amp & 0xffff0000; | ||
101 | *out++ = (uint16_t)l | h; | ||
102 | } | ||
103 | while ((size -= 4) > 0); | ||
104 | } | ||
105 | } | ||
106 | |||
107 | |||
108 | #endif | ||