AML8726调试记录

A:android本身的机制，调节volume时不会去控制声卡上的寄存器，而是通过软件算法将volume调大或者调小。声卡控制的音频输出有好几路，每一路都有vol和gain控制着音量大小。
 
#cat /sys/class/sound/card0/device/RT5631/codec_reg →察看寄存器值
# tinymix 15 20 → Speaker Playback Volume设置为20
# tinymix 18 20 → HP Playback Volume设置为20
 
root@android:/# tinymix
 

Numberof controls: 82  
ctl type num name value  
0 ENUM 1 MIC1Mode Control Differential  
1 INT 1 MIC1Boost 3  
2 ENUM 1 MIC2Mode Control Differential  
3 INT 1 MIC2Boost 3  
4 ENUM 1 MONOINMode Control Differential  
5 INT 2 MONOIN_RXCapture Volume 23 23  
6 INT 2 AXICapture Volume 23 23  
7 INT 2 PCMRecord Volume 255 255  
8 BOOL 2 PCMRecord Switch On On  
9 INT 2 PCMPlayback Volume 255 255  
10 BOOL 2 PCMPlayback Switch On On  
11 BOOL 1 AXO1Playback Switch On  
12 BOOL 1 AXO2Playback Switch On  
13 BOOL 2 OUTVOLChannel Switch On On  
14 BOOL 2 SpeakerPlayback Switch On On  
15 INT 2 SpeakerPlayback Volume 20 20  
16 BOOL 1 MONOPlayback Switch Off  
17 BOOL 2 HPPlayback Switch On On  
18 INT 2 HPPlayback Volume 31 31  
19 BOOL 1 DMICSwitch Off  
20 BOOL 2 DMICCapture Switch Off Off  
21 ENUM 1 SPKRatio Control 1.44x  
22 BOOL 1 CallMode Switch Off  
23 ENUM 1 HPRMux Right HPVOL  
24 ENUM 1 HPLMux Left HPVOL  
25 ENUM 1 MONOMux MONOMIX  
26 ENUM 1 SPORMux SPORMIX  
27 ENUM 1 SPOLMux SPOLMIX  
28 BOOL 1 AXO2MIXMixer MIC1_BST1 Playback Switch Off  
29 BOOL 1 AXO2MIXMixer MIC2_BST2 Playback Switch Off  
30 BOOL 1 AXO2MIXMixer OUTVOLL Playback Switch Off  
31 BOOL 1 AXO2MIXMixer OUTVOLR Playback Switch Off  
32 BOOL 1 SPORMIXMixer SPKVOLL Playback Switch Off  
33 BOOL 1 SPORMIXMixer SPKVOLR Playback Switch On  
34 BOOL 1 MONOMIXMixer OUTVOLL Playback Switch Off  
35 BOOL 1 MONOMIXMixer OUTVOLR Playback Switch Off  
36 BOOL 1 SPOLMIXMixer SPKVOLL Playback Switch On  
37 BOOL 1 SPOLMIXMixer SPKVOLR Playback Switch Off  
38 BOOL 1 AXO1MIXMixer MIC1_BST1 Playback Switch Off  
39 BOOL 1 AXO1MIXMixer MIC2_BST2 Playback Switch Off  
40 BOOL 1 AXO1MIXMixer OUTVOLL Playback Switch On  
41 BOOL 1 AXO1MIXMixer OUTVOLR Playback Switch Off  
42 ENUM 1 RightSPKVOL Mux SPKMIXR  
43 ENUM 1 RightHPVOL Mux OUTMIXR  
44 ENUM 1 RightOUTVOL Mux OUTMIXR  
45 ENUM 1 LeftOUTVOL Mux OUTMIXL  
46 ENUM 1 LeftHPVOL Mux OUTMIXL  
47 ENUM 1 LeftSPKVOL Mux SPKMIXL  
48 BOOL 1 SPKMIXRMixer OUTMIXR Playback Switch Off  
49 BOOL 1 SPKMIXRMixer DACR Playback Switch On  
50 BOOL 1 SPKMIXRMixer MIC2_P Playback Switch Off  
51 BOOL 1 SPKMIXRMixer RECMIXR Playback Switch Off  
52 BOOL 1 OUTMIXRMixer VDAC Playback Switch Off  
53 BOOL 1 OUTMIXRMixer AXIRVOL Playback Switch Off  
54 BOOL 1 OUTMIXRMixer AXILVOL Playback Switch Off  
55 BOOL 1 OUTMIXRMixer MONOIN_RXN Playback Switch Off  
56 BOOL 1 OUTMIXRMixer MIC2_BST2 Playback Switch Off  
57 BOOL 1 OUTMIXRMixer MIC1_BST1 Playback Switch Off  
58 BOOL 1 OUTMIXRMixer DACR Playback Switch On  
59 BOOL 1 OUTMIXRMixer RECMIXR Playback Switch Off  
60 BOOL 1 OUTMIXRMixer RECMIXL Playback Switch Off  
61 BOOL 1 OUTMIXLMixer RECMIXL Playback Switch Off  
62 BOOL 1 OUTMIXLMixer RECMIXR Playback Switch Off  
63 BOOL 1 OUTMIXLMixer DACL Playback Switch On  
64 BOOL 1 OUTMIXLMixer MIC1_BST1 Playback Switch Off  
65 BOOL 1 OUTMIXLMixer MIC2_BST2 Playback Switch Off  
66 BOOL 1 OUTMIXLMixer MONOIN_RXP Playback Switch Off  
67 BOOL 1 OUTMIXLMixer AXILVOL Playback Switch Off  
68 BOOL 1 OUTMIXLMixer AXIRVOL Playback Switch Off  
69 BOOL 1 OUTMIXLMixer VDAC Playback Switch Off  
70 BOOL 1 SPKMIXLMixer RECMIXL Playback Switch Off  
71 BOOL 1 SPKMIXLMixer MIC1_P Playback Switch Off  
72 BOOL 1 SPKMIXLMixer DACL Playback Switch On  
73 BOOL 1 SPKMIXLMixer OUTMIXL Playback Switch Off  
74 BOOL 1 RECMIXRMixer MONOIN_RX Capture Switch On  
75 BOOL 1 RECMIXRMixer AXIRVOL Capture Switch Off  
76 BOOL 1 RECMIXRMixer MIC2_BST2 Capture Switch On  
77 BOOL 1 RECMIXRMixer OUTMIXR Capture Switch Off  
78 BOOL 1 RECMIXLMixer OUTMIXL Capture Switch Off  
79 BOOL 1 RECMIXLMixer MIC1_BST1 Capture Switch On  
80 BOOL 1 RECMIXLMixer AXILVOL Capture Switch Off  
81 BOOL 1 RECMIXLMixer MONOIN_RX Capture Switch On