PowerPlay Sample

An energy-efficient audio player sample application demonstrating the use of the Performance Modes in Oboe library. It showcases different audio performance modes, including low-latency, power-saving, and hardware PCM offload, wrapped in a modern Jetpack Compose UI.

Features

• Performance Modes: Switch between None, Low Latency, Power Saving, and hardware PCM Offload playback modes.
• PCM Offload: Support for hardware PCM Offloaded playback to dramatically reduce power consumption for continuous playback.
• Audio API Selection: Toggle between MMAP and Classic audio pathways.
• Dynamic Playback: Play bundled audio tracks or load custom local WAV files from your device.
• Intent Automation: Support for automation via ADB intents to control playback, modes, and configurations programmatically.
• Foreground Service: Ensures uninterrupted audio playback while the app is in the background or the screen is off.

UI Overview

• Play/Pause Button: Controls playback for the current track.
• Seek Bar: Adjust the current playback position. Only available in non-offload modes.
• Settings Bottom Sheet: Configure performance modes (Low Latency, Power Saving, PCM Offload), adjust requested buffer size in frames, and toggle MMAP.
• Info Dialog: View details about the current audio mode, WAV file properties (Sample Rate, Channels, Bit Depth, Duration), and actual buffer size.
• Add Local File: Load custom WAV files directly from your device storage to add to your queue.

Technical Details

• Engine: C++ PowerPlayMultiPlayer managing Oboe streams, buffer sizing, and performance configurations.
• Audio Format: Uses Float PCM audio encoding with stereo output.
• Automation: IntentBasedTestSupport allows programmatic control via Android Intents for robust testing. For more information, see the Automation Guide.
• State Management: Jetpack Compose manages the UI states and synchronizes them with the underlying C++ audio engine.

Images