Xiaomi Redmi Note 8 Pro 64Gb+6Gb Dual LTE [63/132] Audio playback

5.5. Audio Playback

Android includes the support to allow apps to playback audio through the audio output peripheral as

defined in section 7.8.2.

5.5.1. Raw Audio Playback

If device implementations declare android.hardware.audio.output , they:

[C-1-1] MUST allow playback of raw audio content with the following characteristics:

Format : Linear PCM, 16-bit, 8-bit, float

Channels : Mono, Stereo, valid multichannel configurations with up to 8

channels

Sampling rates (in Hz) :

8000, 11025, 16000, 22050, 32000, 44100, 48000 at the channel

configurations listed above

96000 in mono and stereo

SHOULD allow playback of raw audio content with the following characteristics:

Sampling rates : 24000, 48000

5.5.2. Audio Effects

Android provides an API for audio effects for device implementations.

If device implementations declare the feature android.hardware.audio.output , they:

[C-1-1] MUST support the EFFECT_TYPE_EQUALIZER and

EFFECT_TYPE_LOUDNESS_ENHANCER implementations controllable through the

AudioEffect subclasses Equalizer , LoudnessEnhancer .

[C-1-2] MUST support the visualizer API implementation, controllable through the Visualizer

class.

[C-1-3] MUST support the EFFECT_TYPE_DYNAMICS_PROCESSING implementation

controllable through the AudioEffect subclass DynamicsProcessing .

SHOULD support the EFFECT_TYPE_BASS_BOOST , EFFECT_TYPE_ENV_REVERB ,

EFFECT_TYPE_PRESET_REVERB , and EFFECT_TYPE_VIRTUALIZER implementations

controllable through the AudioEffect sub-classes BassBoost , EnvironmentalReverb , PresetReverb ,

and Virtualizer .

5.5.3. Audio Output Volume

Automotive device implementations:

SHOULD allow adjusting audio volume separately per each audio stream using the

content type or usage as defined by AudioAttributes and car audio usage as publicly

defined in android.car.CarAudioManager .

5.6. Audio Latency

Audio latency is the time delay as an audio signal passes through a system. Many classes of

applications rely on short latencies, to achieve real-time sound effects.

For the purposes of this section, use the following definitions:

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