created_at2020-09-01 22:26:01.987305
updated_at2024-02-27 03:37:14.575835
descriptionPure Rust media container and audio decoding library.
Philip Deljanov (pdeljanov)




Crate Info API Docs Rustc Version 1.53.0+

Symphonia is a pure Rust audio decoding and media demuxing library supporting AAC, ADPCM, AIFF, ALAC, CAF, FLAC, MKV, MP1, MP2, MP3, MP4, OGG, Vorbis, WAV, and WebM.

Getting Started · Documentation · Examples · Benchmarks


  • Decode support for the most popular audio codecs with support for gapless playback
  • Demux the most common media container formats
  • Read most metadata and tagging formats
  • Automatic format and decoder detection
  • Basic audio primitives for manipulating audio data efficiently
  • 100% safe Rust
  • Minimal dependencies
  • Fast with no compromises in performance!

Additionally, planned features include:

  • Providing a C API for integration into other languages
  • Providing a WASM API for web usage

Current Support

Support for individual audio codecs and media formats are provided by separate crates. By default, Symphonia only enables support royalty-free open standard codecs and formats, but others may be enabled using feature flags.

Tip: All formats and codecs can be enabled with the all feature flag.


The following status classifications are used to determine the state of development for each format or codec.

Status Meaning
Good Many media streams play. Some streams may panic, error, or produce audible glitches. Some features may not be supported.
Great Most media streams play. Inaudible glitches may be present. Most common features are supported.
Excellent All media streams play. No audible or inaudible glitches. All required features are supported.

A status of Great indicates that major development is complete and that the feature is in a state that would be acceptable for most applications to use.

A status of Excellent is only assigned after the feature passes all compliance tests. If no compliance tests are readily available, then a status of Excellent will be assigned if Symphonia's output matches that of a reference implementation, or ffmpeg, over a large test corpus.

Formats (Demuxers)

Format Status Gapless* Feature Flag Default Crate
AIFF Great Yes aiff No symphonia-format-riff
CAF Good No caf No symphonia-format-caf
ISO/MP4 Great No isomp4 No symphonia-format-isomp4
MKV/WebM Good No mkv Yes symphonia-format-mkv
OGG Great Yes ogg Yes symphonia-format-ogg
Wave Excellent Yes wav Yes symphonia-format-riff

* Gapless playback requires support from both the demuxer and decoder.

Tip: All formats can be enabled with the all-formats feature flag.

Codecs (Decoders)

Codec Status Gapless Feature Flag Default Crate
AAC-LC Great No aac No symphonia-codec-aac
ADPCM Good Yes adpcm Yes symphonia-codec-adpcm
ALAC Great Yes alac No symphonia-codec-alac
FLAC Excellent Yes flac Yes symphonia-bundle-flac
MP1 Great No mp1, mpa No symphonia-bundle-mp3
MP2 Great No mp2, mpa No symphonia-bundle-mp3
MP3 Excellent Yes mp3, mpa No symphonia-bundle-mp3
PCM Excellent Yes pcm Yes symphonia-codec-pcm
Vorbis Excellent Yes vorbis Yes symphonia-codec-vorbis

A symphonia-bundle-* package is a combination of a decoder and a native demuxer.

Tip: All codecs can be enabled with the all-codecs feature flag. Similarly, all MPEG audio codecs can be enabled with the mpa feature flag.

Tags (Readers)

All metadata readers are provided by the symphonia-metadata crate.

Format Status
ID3v1 Great
ID3v2 Great
ISO/MP4 Great
RIFF Great
Vorbis comment (FLAC) Perfect
Vorbis comment (OGG) Perfect


In addition to the safety guarantees afforded by Rust, Symphonia aims to:

  • Decode media as correctly as the leading free-and-open-source software decoders
  • Prevent denial-of-service attacks
  • Be fuzz-tested
  • Provide a powerful, consistent, and easy to use API


Symphonia aims to be comparable to, or faster than, popular open-source C-based implementations. Currently, Symphonia's decoders are generally +/-15% the performance of FFMpeg. However, the exact range will depend strongly on the codec, which features of the codec are being leveraged in the encoding, the Rust compiler version, and the CPU architecture being compiled for.

See the benchmarks for more information.


At this time, SIMD optimizations are not enabled by default. Enabling any SIMD support feature flags will pull in the rustfft dependency.

Instruction Set Feature Flag Default
SSE opt-simd-sse No
AVX opt-simd-avx No
Neon opt-simd-neon No

Tip: All SIMD optimizations can be enabled with the opt-simd feature flag.


Basic usage examples may be found here.

For a more complete application, see symphonia-play, a simple music player.


Symphonia provides the following tools for debugging purposes:

  • symphonia-play for probing, decoding, validating, and playing back media streams.
  • symphonia-check for validating Symphonia's decoded output against various decoders.


The primary author is Philip Deljanov.

Special Thanks

  • Kostya Shishkov (AAC-LC decoder contribution, see symphonia-codec-aac)


Symphonia is provided under the MPL v2.0 license. Please refer to the LICENSE file for more details.


Symphonia is a free and open-source project that welcomes contributions! To get started, please read our Contribution Guidelines.

Commit count: 562

cargo fmt