1## 5.5\. Audio Playback 2 3Android includes the support to allow apps to playback audio through the audio 4output peripheral as defined in section 7.8.2. 5 6### 5.5.1\. Raw Audio Playback 7 8If device implementations declare `android.hardware.audio.output`, they: 9 10* [C-1-1] MUST allow playback of raw audio content with the following 11characteristics: 12 13 * **Source formats**: Linear PCM, 16-bit, 8-bit, float 14 * **Channels**: Mono, Stereo, valid multichannel configurations 15 with up to 8 channels 16 * **Sampling rates (in Hz)**: 17 * 8000, 11025, 16000, 22050, 32000, 44100, 48000 at the channel 18 configurations listed above 19 * 96000 in mono and stereo 20 21* SHOULD allow playback of raw audio content with the following 22characteristics: 23 24 * **Sampling rates**: 24000, 48000 25 26### 5.5.2\. Audio Effects 27 28Android provides an [API for audio effects]( 29http://developer.android.com/reference/android/media/audiofx/AudioEffect.html) 30for device implementations. 31 32If device implementations declare the feature `android.hardware.audio.output`, 33they: 34 35* [C-1-1] MUST support the `EFFECT_TYPE_EQUALIZER` and 36`EFFECT_TYPE_LOUDNESS_ENHANCER` implementations controllable through the 37AudioEffect subclasses `Equalizer` and `LoudnessEnhancer`. 38* [C-1-2] MUST support the visualizer API implementation, controllable through 39the `Visualizer` class. 40* [C-1-3] MUST support the `EFFECT_TYPE_DYNAMICS_PROCESSING` implementation 41controllable through the AudioEffect subclass [`DynamicsProcessing`](https://developer.android.com/reference/android/media/audiofx/DynamicsProcessing). 42* SHOULD support the `EFFECT_TYPE_BASS_BOOST`, `EFFECT_TYPE_ENV_REVERB`, 43`EFFECT_TYPE_PRESET_REVERB`, and `EFFECT_TYPE_VIRTUALIZER` implementations 44controllable through the `AudioEffect` sub-classes `BassBoost`, 45`EnvironmentalReverb`, `PresetReverb`, and `Virtualizer`. 46* [C-SR] Are STRONGLY RECOMMENDED to support effects in floating-point and 47multichannel. 48 49### 5.5.3\. Audio Output Volume 50 51Automotive device implementations: 52 53* SHOULD allow adjusting audio volume 54separately per each audio stream using the content type or usage as defined 55by [AudioAttributes]("http://developer.android.com/reference/android/media/AudioAttributes.html") 56and car audio usage as publicly defined in `android.car.CarAudioManager`. 57