A40i开发板语音配置

最新推荐文章于 2024-10-14 13:40:56 发布

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最新推荐文章于 2024-10-14 13:40:56 发布

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#linux #语音 #amixer

本文详细介绍了A40i/T3设备上的AudioCodec音频编解码器如何通过ALSA进行系统配置，包括列出声卡、控制音量、耳机和喇叭测试，以及使用amixer和aplay工具进行音频播放和设备管理。

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A40i/T3 内部集成 Audio Codec 是一款带耳机放大器的高品质立体声音频编解码器。用户可以使用文件系统内带的 ALSA 音频录制、播放、配置工具进行测试。

一、音频系统简单配置

1. ALSA

在 ALSA 的定义里，系统中的每一个音频设备都称作“声卡”。可以使用如下命令列出所有已连接的音频设备：

# cat /proc/asound/cards
 0 [audiocodec     ]: audiocodec - audiocodec
                      audiocodec
 1 [sndhdmi        ]: sndhdmi - sndhdmi
                      sndhdmi
#

可以看到此时系统中有2个声卡，声卡 0 audiocodec和声卡1 sndhdmi。

或者通过下面的指令查看当前设备的声卡

# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: audiocodec [audiocodec], device 0: SUNXI-CODEC sun8iw11codec-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sndhdmi [sndhdmi], device 0: SUNXI-HDMIAUDIO sndhdmi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
#

用amixer scontents查看有哪些参数可以控制（包含所有控制器的音量信息）

# amixer scontents
Simple mixer control 'Headphone',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Headphone volume',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 63
  Mono: 59 [94%]
Simple mixer control 'PCM music volume',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 255
  Front Left: 255 [100%]
  Front Right: 255 [100%]
Simple mixer control 'FM gain volume',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 3 [43%]
Simple mixer control 'Phone Out Mixer LOMIX',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Phone Out Mixer MIC1 Boost',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Phone Out Mixer MIC2 Boost',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Phone Out Mixer ROMIX',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Phoneout Speaker',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'ADC gain volume',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 3 [43%]
Simple mixer control 'HPL Mux',0
  Capabilities: enum
  Items: 'DAC' 'OMIX'
  Item0: 'DAC'
Simple mixer con