咨询板子的音频输入问题,急急急!

jnrobin · 发表于 2019-2-20 10:42:51

3399c的板子,需要从line in获取音频数据,但是主板默认从板载mic上获取声音,修改了 frameworks/av/services/audiopolicy/audio_policy.conf 内的内容
修改位置1:
global_configuration {
   attached_output_devices AUDIO_DEVICE_OUT_SPEAKER
   default_output_device AUDIO_DEVICE_OUT_SPEAKER
   # attached_input_devices AUDIO_DEVICE_IN_BUILTIN_MIC
   attached_input_devices AUDIO_DEVICE_IN_AUX_DIGITAL|AUDIO_DEVICE_IN_LINE|AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET|AUDIO_DEVICE_IN_WIRED_HEADSET
   audio_hal_version 3.0
}

修改位置2:
inputs {
   # primary {
   # sampling_rates 8000|16000
   # channel_masks AUDIO_CHANNEL_IN_MONO
   # formats AUDIO_FORMAT_PCM_16_BIT
   # devices AUDIO_DEVICE_IN_BUILTIN_MIC
   # }
   primary {
      sampling_rates 8000|11025|12000|16000|22050|24000|32000|44100|48000
      channel_masks AUDIO_CHANNEL_IN_MONO|AUDIO_CHANNEL_IN_STEREO
      formats AUDIO_FORMAT_PCM_16_BIT
      devices AUDIO_DEVICE_IN_AUX_DIGITAL|AUDIO_DEVICE_IN_LINE|AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET|AUDIO_DEVICE_IN_WIRED_HEADSET
   }
}

但是无效.

leung先森 · 发表于 2019-2-20 11:08:51

1.要从linein获取音频数据要先将linein输入到codec的通路打开
2.然后再处理codec到cpu的数据

jnrobin · 发表于 2019-2-20 11:23:03

leung先森发表于 2019-2-20 11:08
1.要从linein获取音频数据要先将linein输入到codec的通路打开
2.然后再处理codec到cpu的数据

很复杂阿.能否麻烦详细讲讲