Struct DefaultStreamValues

pub struct DefaultStreamValues(/* private fields */);

The default (optimal) audio streaming values.

On API 16 to 26 OpenSL ES will be used. When using OpenSL ES the optimal values for sample_rate and frames_per_burst are not known by the native code. On API 17+ these values should be obtained from the AudioManager using this code:

// Note that this technique only works for built-in speakers and headphones.
AudioManager myAudioMgr = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
String sampleRateStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
int defaultSampleRate = Integer.parseInt(sampleRateStr);
String framesPerBurstStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER);
int defaultFramesPerBurst = Integer.parseInt(framesPerBurstStr);

It can then be passed down to Oboe through JNI.

AAudio will get the optimal frames_per_burst from the HAL and will ignore this value.

Implementations

impl DefaultStreamValues

pub fn get_sample_rate() -> i32

The default sample rate to use when opening new audio streams

pub fn set_sample_rate(sample_rate: i32)

pub fn get_frames_per_burst() -> i32

The default frames per burst to use when opening new audio streams

pub fn set_frames_per_burst(frames_per_burst: i32)

pub fn get_channel_count() -> i32

The default channel count to use when opening new audio streams

pub fn set_channel_count(channel_count: i32)

impl DefaultStreamValues

pub fn init() -> Result<(), String>

Available on crate feature java-interface only.

Try request defaults from AudioManager properties.