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57 lines
2.3 KiB
57 lines
2.3 KiB
7 months ago
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## 5.5\. Audio Playback
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Android includes the support to allow apps to playback audio through the audio
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output peripheral as defined in section 7.8.2.
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### 5.5.1\. Raw Audio Playback
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If device implementations declare `android.hardware.audio.output`, they:
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* [C-1-1] MUST allow playback of raw audio content with the following
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characteristics:
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* **Source formats**: Linear PCM, 16-bit, 8-bit, float
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* **Channels**: Mono, Stereo, valid multichannel configurations
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with up to 8 channels
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* **Sampling rates (in Hz)**:
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* 8000, 11025, 16000, 22050, 32000, 44100, 48000 at the channel
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configurations listed above
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* 96000 in mono and stereo
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* SHOULD allow playback of raw audio content with the following
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characteristics:
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* **Sampling rates**: 24000, 48000
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### 5.5.2\. Audio Effects
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Android provides an [API for audio effects](
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http://developer.android.com/reference/android/media/audiofx/AudioEffect.html)
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for device implementations.
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If device implementations declare the feature `android.hardware.audio.output`,
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they:
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* [C-1-1] MUST support the `EFFECT_TYPE_EQUALIZER` and
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`EFFECT_TYPE_LOUDNESS_ENHANCER` implementations controllable through the
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AudioEffect subclasses `Equalizer` and `LoudnessEnhancer`.
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* [C-1-2] MUST support the visualizer API implementation, controllable through
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the `Visualizer` class.
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* [C-1-3] MUST support the `EFFECT_TYPE_DYNAMICS_PROCESSING` implementation
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controllable through the AudioEffect subclass [`DynamicsProcessing`](https://developer.android.com/reference/android/media/audiofx/DynamicsProcessing).
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* SHOULD support the `EFFECT_TYPE_BASS_BOOST`, `EFFECT_TYPE_ENV_REVERB`,
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`EFFECT_TYPE_PRESET_REVERB`, and `EFFECT_TYPE_VIRTUALIZER` implementations
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controllable through the `AudioEffect` sub-classes `BassBoost`,
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`EnvironmentalReverb`, `PresetReverb`, and `Virtualizer`.
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* [C-SR] Are STRONGLY RECOMMENDED to support effects in floating-point and
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multichannel.
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### 5.5.3\. Audio Output Volume
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Automotive device implementations:
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* SHOULD allow adjusting audio volume
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separately per each audio stream using the content type or usage as defined
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by [AudioAttributes]("http://developer.android.com/reference/android/media/AudioAttributes.html")
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and car audio usage as publicly defined in `android.car.CarAudioManager`.
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