Lightweight audio engine for iOS and OSX with flac, cue, mp3, m4a, m3u support.
Objective-C Ruby
Latest commit 0bbdc3c Apr 5, 2015 ap4y Use constant 48khz sampling rate for all opus files.
Previously used sampling rate of original stream, according to the docs
should be always 48khz.

updates #57

README.md

Lightweight iOS and OSX audio engine with opus, flac, cue, mp3, m4a, m3u support.

Supported formats

  • Audio sources: http and local files
  • Audio files: opus, flac, mp3, m4a, wav and other from CoreAudio
  • Playlists: cue, m3u

Features

  • Ligthweight: 300kb compiled, 1.2mb with libFLAC
  • Small memory foorprint: no more than 2.5mb for the flac files
  • Low resource consumption: about 14% CPU usage for FLAC on ipod 4g
  • All operations in background with GCD
  • Event-based (using dispatch sources and CoreAudio async api)
  • Provides full audio metadata (vorbis, id3 tags) with embeeded cover images
  • HTTP data caching
  • Tested (currently about 85% code coverage)

Overview

Static library and cocoapods podspec provided. Static library can be compiled with embeeded FLAC library (check project targets). For OSX you can use static framework.

Start playback:

self.player = [[ORGMEngine alloc] init];
NSURL* url = [NSURL URLWithString:tfUrl.text];
[_player playUrl:url];

Common operations:

[_player metadata];                         // current metadata
[_player pause];                            // pause playback
[_player resume];                           // resume playback
[_player stop];                             // stop playback
[_player seekToTime:seekSlider.value];      // seek to second
[_player setNextUrl:url withDataFlush:YES]; // play next track and clear current buffer

Delegate methods:

- (NSURL*)engineExpectsNextUrl:(ORGMEngine*)engine; // provides continious playback
- (void)engine:(ORGMEngine*)engine didChangeState:(ORGMEngineState)state; // state change callback

Check example project and tests for the additional information.

Documentation

Project headers contain appledoc comments, precompiled docset here.

Tests

OCUnit tests included into the project.

Credits

  • http://cogx.org/ by Vincent Spader. FLAC decoder implementation based on Cog sources

License

(MIT license)