Module codecs

Audio Codec Implementations

This module contains G.711 audio codec implementation for VoIP applications.

Available Codecs

G.711 (PCMU/PCMA) - g711

• Standard: ITU-T G.711
• Sample Rate: 8 kHz
• Bitrate: 64 kbps
• Quality: ~37 dB SNR
• Use Case: Standard telephony
• Variants: μ-law (PCMU), A-law (PCMA)

Testing

G.711 is validated with real speech samples through WAV roundtrip tests:

• Downloads reference audio samples
• Round-trip encoding and decoding validation
• Signal-to-Noise Ratio (SNR) measurement

Usage Examples

Using the Codec Factory

use codec_core::codecs::CodecFactory;
use codec_core::types::{CodecConfig, CodecType, SampleRate};

// Create any codec through the factory
let config = CodecConfig::new(CodecType::G711Pcmu)
    .with_sample_rate(SampleRate::Rate8000);
let mut codec = CodecFactory::create(config)?;

// Use unified interface
let samples = vec![0i16; 160];
let encoded = codec.encode(&samples)?;
let decoded = codec.decode(&encoded)?;

Direct Codec Access

use codec_core::codecs::g711::{G711Codec, G711Variant};

// Direct instantiation  
let mut g711_ulaw = G711Codec::new(G711Variant::MuLaw);
let mut g711_alaw = G711Codec::new(G711Variant::ALaw);

Testing & Validation

All codecs include comprehensive test suites:

• ITU-T compliance validation
• Real audio roundtrip tests
• Performance benchmarks
• Quality measurements (SNR)

# Test all codecs
cargo test

# Test with real audio (downloads speech samples)
cargo test wav_roundtrip_test -- --nocapture

Modules

g711

G.711 Audio Codec Implementation

Structs

CodecCapabilities

Codec capability information

CodecFactory

Codec factory for creating codec instances

CodecRegistry

Codec registry for managing multiple codec instances