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ALAC (Apple Lossless Audio Codec)

ALAC provides high-quality lossless audio compression, ideal for archival and professional use cases.

Overview​

Apple Lossless Audio Codec (ALAC) offers the perfect balance between file size and audio quality, providing bit-perfect reproduction of the original audio while reducing file size by approximately 40-60%.

Configuration​

Basic ALAC Setup​

import AudiocapRecorder

// Configure ALAC compression
let alacConfig = ALACConfiguration(
    sampleRate: 48000,
    channels: 2,
    bitsPerSample: 24
)

// Create recorder with ALAC configuration
let recorder = AudioRecorder(
    compressionType: .alac(alacConfig)
)

Advanced Configuration​

// High-quality stereo recording
let highQualityConfig = ALACConfiguration(
    sampleRate: 96000,    // High sample rate
    channels: 2,          // Stereo
    bitsPerSample: 24,    // 24-bit depth
    fastMode: false       // Prioritize compression over speed
)

Use Cases​

  • Professional Recording: Studio-quality audio capture
  • Archival: Long-term storage with perfect quality
  • Music Production: Maintaining audio fidelity throughout the workflow
  • Broadcasting: High-quality content distribution

Performance Characteristics​

  • Compression Ratio: 40-60% size reduction
  • Quality: Bit-perfect lossless reproduction
  • CPU Usage: Moderate (higher than lossy formats)
  • Compatibility: Native macOS and iOS support

See Also​