Record/capture internal sound playback of Android app and export mp3?

Question

Is it possible to record the internal sound generated by the app?

My app allows you to create and play back musical sequences.

soundPool.play(soundIds[i], 1f, 1f, 1, 0,  Constants.TIME_RATE);

I'd like to be able to record the sequence and export to mp3.

I've looked into Audio Capture but setAudioSource (int audio_source) only seems to accept MIC recording.

Thanks

Answer 1

No, there's no API for getting the audio output, even for your own app (actually that's not entirely true, because you can get it through the Visualizer API, but it would be of such low quality that I doubt it would be of any use for you).

If you want that kind of functionality you'll have to implement it yourself. That is; as you start playback of sounds, mix them and write the result to a file as well. If the sounds are compressed you'll also have to take case of decoding them yourself.

Note that there's no MP3 encoder included with Android, so you'd have to supply your own MP3 encoder anyway if that's the format you want to export in.

Answer 2

As the michael said , u need to implement your own encoder and decoder for that . Visualizer is providing very low quality of data becaz we can use it to show on custom views and effects which are synchronized with equalizer.

This is the link where u will find simple decoder and encoder for MP3 file. Where they are reading data from MP3 file and putting it into new MP3 file. They had created support for some other extension too.

http://code.google.com/p/ringdroid/source/browse/#svn%2Fbranches%2Fgingerbread%2Fsrc%2Fcom%2Fringdroid