Question

我正在使用低延迟快速路径开发VoIP应用程序，问题是当我将音频路由更改为扬声器时，我注意到记录器回调每隔100毫秒而不是5毫秒触发，因为它应该工作并产生以下错误：

E/ACDB-LOADER(  183): Error: ACDB AudProc vol returned = -19
D/audio_hw_primary(  183): enable_snd_device: snd_device(32: speaker-mic)
D/audio_hw_primary(  183): enable_audio_route: apply and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_audio_route: reset and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_snd_device: snd_device(32: speaker-mic)
E/AudioFlinger(  183): read failed: framesRead=-2147483631
D/audio_hw_primary(  183): select_devices: out_snd_device(0: none) in_snd_device(32: speaker-mic)
D/msm8974_platform(  183): platform_send_audio_calibration: sending audio calibration for snd_device(32) acdb_id(11)
D/        (  183): Failed to fetch the lookup information of the device 0000000B 
E/ACDB-LOADER(  183): Error: ACDB AudProc vol returned = -19
D/audio_hw_primary(  183): enable_snd_device: snd_device(32: speaker-mic)
D/audio_hw_primary(  183): enable_audio_route: apply and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_audio_route: reset and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_snd_device: snd_device(32: speaker-mic)
E/AudioFlinger(  183): read failed: framesRead=-2147483631
D/audio_hw_primary(  183): select_devices: out_snd_device(0: none) in_snd_device(32: speaker-mic)
D/msm8974_platform(  183): platform_send_audio_calibration: sending audio calibration for snd_device(32) acdb_id(11)
D/        (  183): Failed to fetch the lookup information of the device 0000000B 
E/ACDB-LOADER(  183): Error: ACDB AudProc vol returned = -19
D/audio_hw_primary(  183): enable_snd_device: snd_device(32: speaker-mic)
D/audio_hw_primary(  183): enable_audio_route: apply and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_audio_route: reset and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_snd_device: snd_device(32: speaker-mic)
E/AudioFlinger(  183): read failed: framesRead=-2147483631
D/audio_hw_primary(  183): select_devices: out_snd_device(0: none) in_snd_device(32: speaker-mic)
D/msm8974_platform(  183): platform_send_audio_calibration: sending audio calibration for snd_device(32) acdb_id(11)
D/        (  183): Failed to fetch the lookup information of the device 0000000B 
E/ACDB-LOADER(  183): Error: ACDB AudProc vol returned = -19
D/audio_hw_primary(  183): enable_snd_device: snd_device(32: speaker-mic)
D/audio_hw_primary(  183): enable_audio_route: apply and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_audio_route: reset and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_snd_device: snd_device(32: speaker-mic)
E/AudioFlinger(  183): read failed: framesRead=-2147483631
D/audio_hw_primary(  183): select_devices: out_snd_device(0: none) in_snd_device(32: speaker-mic)
D/msm8974_platform(  183): platform_send_audio_calibration: sending audio calibration for snd_device(32) acdb_id(11)
D/        (  183): Failed to fetch the lookup information of the device 0000000B 
E/ACDB-LOADER(  183): Error: ACDB AudProc vol returned = -19
D/audio_hw_primary(  183): enable_snd_device: snd_device(32: speaker-mic)
D/audio_hw_primary(  183): enable_audio_route: apply and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_audio_route: reset and update mixer path: low-latency-record
D/audio_hw_primary(  183): disable_snd_device: snd_device(32: speaker-mic)
E/AudioFlinger(  183): read failed: framesRead=-2147483631

设备：Nexus 5 Android 5.0.1
原生缓冲区大小为240个样本（短裤）
原生频率48000赫兹播放器预设：
SL_ANDROID_STREAM_VOICE
记录器预设：SL_ANDROID_RECORDING_PRESET_VOICE_COMMUNICATION
MODE_IN_COMMUNICATION上的AudioManager

重要的是要注意，如果音频路线保留在耳机上，它可以正常工作。有谁知道问题是什么？

Answer 1

您的代码可以正常使用耳机告诉我，更改到扬声器的路径会产生延迟。

OpenSL默认将音频播放路由到扬声器。现在，当您将streamType设置为SL_ANDROID_STREAM_VOICE时，它会将音频路由到您的耳机。将音频路由回扬声器时，可能需要将streamType设置为默认值并再次初始化播放器。

我不知道确切的原因，为什么你的录音机回调在100ms而不是5ms之后被解雇。但无论如何，我认为你已正确设置了audio sampling rate of your device。

还有另一件要检查的是缓冲区大小。是的240是可以的。但您可能会尝试设置较小的尺寸，因为您需要经常触发录像机回调。

希望有所帮助。

Android低延迟OpenSLES：录音机停止工作音频路由更改为扬声器

1 个答案: