Platform: RK3399
OS: Android 7.1
Kernel: v4.4.83
文件内容:
按模块划分,比如primary,a2dp, usb…
模块里包含硬件设备支持的参数,比如采样率、通道数、数据位深。
audio_hw_modules {
primary {
outputs {
primary {
sampling_rates 44100|48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO|AUDIO_DEVICE_OUT_AUX_DIGITAL|AUDIO_DEVICE_OUT_SPDIF
flags AUDIO_OUTPUT_FLAG_PRIMARY
}
hdmi {
sampling_rates 44100|48000|192000
channel_masks AUDIO_CHANNEL_OUT_5POINT1|AUDIO_CHANNEL_OUT_STEREO|AUDIO_CHANNEL_OUT_7POINT1
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_AUX_DIGITAL
flags AUDIO_OUTPUT_FLAG_DIRECT
}
}
}
a2dp {
outputs {
a2dp {
sampling_rates 44100
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_ALL_A2DP
}
}
}
}
生成目录:
一般有两个地方:
#define AUDIO_POLICY_CONFIG_FILE "/system/etc/audio_policy.conf"
#define AUDIO_POLICY_VENDOR_CONFIG_FILE "/vendor/etc/audio_policy.conf"
一般它都是存在/system/etc/下。
代码加载位置:
AudioPolicyManagerBase::Audio