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https://github.com/sahaRatul/sela

SimplE Lossless Audio
https://github.com/sahaRatul/sela

audio-processing codec lossless-compression-algorithm

Last synced: 22 days ago
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SimplE Lossless Audio

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# SELA

### SimplE Lossless Audio

[![Build Status](https://travis-ci.org/sahaRatul/sela.svg?branch=master)](https://travis-ci.org/sahaRatul/sela)

[![codecov](https://codecov.io/gh/sahaRatul/sela/branch/master/graph/badge.svg)](https://codecov.io/gh/sahaRatul/sela)

[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)



A lossless audio codec which aims to be as simple as possible while still having good enough compression ratios. 



#### Code Quality Metrics

[![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=sahaRatul_sela&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=sahaRatul_sela)

[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=sahaRatul_sela&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=sahaRatul_sela)

[![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=sahaRatul_sela&metric=security_rating)](https://sonarcloud.io/dashboard?id=sahaRatul_sela)

[![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=sahaRatul_sela&metric=ncloc)](https://sonarcloud.io/dashboard?id=sahaRatul_sela)



### Build Requirements

- cmake

- MSVC/GCC/CLANG/INTEL (Any compiler supporting C++11 should work)

- libao-dev (linux/bsd) / On windows you can skip this dependency



### Current status

|Task|Status|

|:----:|:------:|

|Encoder|**DONE**|

|Decoder|**DONE**|

|Reading and Writing WAV files|**DONE**|

|Reading and Writing SELA files|**DONE**|

|Multithreaded Encoding & Decoding|**DONE**|

|Player|**DONE**|

|Metadata support|**TODO**|

|Seektable support|**TODO**|

|Support for 24 bit audio|**TODO**|

|Optimization|**TODO**|



### Block Diagrams

![Encoder](https://cloud.githubusercontent.com/assets/12273725/8868411/c24585e6-31f5-11e5-937a-e3c11c632704.png)

![Decoder](https://cloud.githubusercontent.com/assets/12273725/8868418/cbb6a1dc-31f5-11e5-91f6-8290766baa34.png)



To understand the core algorithm, see code in frame namespace, frame namespace utilizes maths which is implemented in lpc and rice namespaces.



### References

- Linear Prediction

  - [Wikipedia](https://en.wikipedia.org/wiki/Linear_prediction)

  - [Digital Signal Processing by John G. Proakis & Dimitris G. Monolakis](http://www.amazon.com/Digital-Signal-Processing-4th-Edition/dp/0131873741)

  - [A detailed pdf](http://www.ece.ucsb.edu/Faculty/Rabiner/ece259/digital%20speech%20processing%20course/lectures_new/Lecture%2013_winter_2012_6tp.pdf)

- Golomb-Rice lossless compression algorithm

  - [Wikipedia](https://en.wikipedia.org/wiki/Golomb_coding)

  - [Here is an implementation](http://michael.dipperstein.com/rice/index.html)

- [FLAC overview](https://xiph.org/flac/documentation_format_overview.html)

- [Paper on shorten, the original open source lossless codec](ftp://svr-ftp.eng.cam.ac.uk/pub/reports/robinson_tr156.ps.Z)

- ISO/IEC 14496 Part 3, Subpart 11 (Audio Lossless Coding)



#### NOTE: You can get the legacy C code by switching to `legacy` branch.



Also, check out the Java version of this codec at [https://github.com/sahaRatul/sela-java](https://github.com/sahaRatul/sela-java)