hey.
I’ve been writing an ffmpeg wrapper to read/write audio files (and metadata) using FFmpeg. I think it’s reached a point where it could be useful for other people.
- Reads virtually any file format (including audio contained in videos, aac support disabled)
- Writes a lot of formats (not aac, not mp3)
- Resampling built into the player and file writer
- Methods to read/write/update metadata
- Utility to generate an ofPath representing the waveform from an audio file
- Contains a readme file that explains how ffmpeg was compiled (must be included with your project if you distribute it publicly)
- Has the funny name of ofxAvCodec, because it took me forever to understand the difference between FFmpeg, libav and libavcodec.
Here’s a quick example (more are in the github readme):
#include "ofxAvAudioPlayer.h"
class ofApp : public ofBaseApp{
// ...
ofSoundStream soundStream;
ofxAvAudioPlayer player;
void audioOut( float * output, int bufferSize, int nChannels );
};
//--------------------------------------------------------------
void ofApp::setup(){
soundStream.setup(this, 2, 0, 44100, 512, 4);
player.setupAudioOut(2, 44100); // set up resampling
player.loadSound(ofToDataPath("testo.flac"));
map<string,string> metadata = player.getMetadata();
}
void ofApp::audioOut( float * output, int bufferSize, int nChannels ){
player.audioOut(output, bufferSize, nChannels);
}
For this to work you’ll also need the FFmpeg shared libraries. You can either compile them yourself (follow this guide: https://github.com/kritzikratzi/ofxAvCodec/blob/master/ffmpeg_src/readme.md or the ffmpeg compilation guide: https://trac.ffmpeg.org/wiki/CompilationGuide)
or instead take the libs i compiled here: https://www.wetransfer.com/downloads/81f26bbceec1d5a783fe8bc36de50b6420151218183950/bdd690f0b76d1f6fc5caafd89287710920151218183950/b6aeb9 contains source, linux32/64, win32/64, osx32, but i can’t guarantee they’ll work, i only tested half of them.
