ffmpeg-audio

A lightweight FFmpeg audio decoding wrapper designed for music player applications.

Features

• Simple and intuitive API
• Pure Rust compilation via cc — no C build system required
• Fully statically linked with zero external FFmpeg dependencies
• Bundled with a specific, up-to-date FFmpeg version (currently 8.1.1)
• Optional tracing feature for FFmpeg log integration

Supported Audio Formats

This crate leverages FFmpeg's decoding capabilities and supports almost all audio formats, including:

• MP3, AAC, FLAC, WAV, OGG, Opus, WMA, ALAC, AIFF, and more

You can find the complete list in generate_config.ts

Supported Sample Formats

The resampler output supports the following Rust-native sample types:

Type	FFmpeg Format
f32	32-bit Float
i16	16-bit Signed
i32	32-bit Signed
u8	8-bit Unsigned

Usage

[dependencies]
ffmpeg_audio = { git = "https://github.com/apoint123/ffmpeg-audio" }

use std::fs::File;
use ffmpeg_audio::{AudioReader, ResampleOptions};

// 1. Initialize the decoding engine
let reader = AudioReader::new(File::open("song.mp3")?)?;

// 2. Configure target audio parameters (e.g., 48kHz, Stereo, 32-bit Float)
let options = ResampleOptions::new()
    .sample_rate(48000)
    .channels(2)
    .format::<f32>();

// 3. Transform into a resampled data pipeline
let mut resampled = reader.into_resampled(options)?;

// 4. Safely pull typed audio frames
while let Some(samples) = resampled.receive_frame_as::<f32>()? {
    // `samples` is strictly typed as &[f32]
    // process your interleaved samples here
}

Supported Platforms

• x86_64-pc-windows-msvc
• i686-pc-windows-msvc
• aarch64-pc-windows-msvc
• aarch64-linux-android
• armv7-linux-androideabi
• i686-linux-android
• x86_64-linux-android
• aarch64-apple-darwin
• x86_64-apple-darwin
• x86_64-unknown-linux-gnu
• aarch64-unknown-linux-gnu
• aarch64-apple-ios
• wasm32-unknown-emscripten

Other target platforms are not currently supported.

Examples

The crates/ffmpeg_audio/examples directory contains runnable examples:

• play.rs — A complete audio player using cpal for audio output
• metadata.rs — Extracts audio metadata and cover art from files

Run an example with:

cargo run --example play -- path/to/audio.mp3
cargo run --example metadata -- path/to/audio.flac

WebAssembly (Emscripten) Build

To build for wasm32-unknown-emscripten, install the following prerequisites:

1. Emscripten SDK (emsdk) — Follow the official installation guide. After installation, make sure emcc is in your PATH.

2. Rust target:

   rustup target add wasm32-unknown-emscripten

3. libclang — Required by bindgen to generate C bindings. Most systems already have it; Emscripten SDK also ships one.

Then build as usual:

cargo build --target wasm32-unknown-emscripten --release

The output (a .js + .wasm pair) can be run with Node.js:

node target/wasm32-unknown-emscripten/release/your_app.js

Project Structure

This is a Cargo workspace containing two crates:

• ffmpeg_audio — High-level Rust API for audio decoding and resampling
• ffmpeg_audio_sys — Low-level FFI bindings to FFmpeg's C libraries

Limitations

This crate focuses solely on audio decoding. The following features are not included:

• Video processing
• Encoders, muxers, and filters
• Swscale (video scaling/conversion)
• Hardware acceleration
• Device and network protocol support

License

GPL 3.0