Android Question Visualizer-WavForm modified

Hello i've modified Visualizer-WavForm example named VizWav.

I want to :

a) Record Load and save a mp3 file but i am new and i don't understand the data stream from examples in the forum.
What code shall i put in 116 , 125 and , 131 lines ?

b) The in_db function ( line 139 ) converts a samle of sound in db ( decibels ).

If i put it in btnStartWav_Click ( line 111 ) so to be synchronized with the spectrum , what shall i write there ?

Many thanks Enthousiastic !!!!!!!!!!!!!

 

From API 16 (JellyBean) it is possible to encode / Decode MP3's, but I don't think it has been wrapped for B4a yet, You could look at using Warwounds LibLame library http://www.b4x.com/android/forum/threads/lib-liblame-mp3-encoder-decoder.22969/ to encode/decode a wav file before playing and after recording. Or for encoding you could try this: http://www.b4x.com/android/forum/th...nd-decoder-play-an-mp3-with-audiotrack.34315/

There is no simple method available yet.

 

Many thanks , i'll try with above links. What about question b for decibels ( in_db sub )and how to convert byte to double ?

 

Take a look here:http://stackoverflow.com/questions/...el-from-amplitude-android-media-recorder?lq=1 it is not simple. Also I remember some discussion about it on the forum in the past, but I couldn't find it quickly. You may want to search for that.

Do you want to convert one byte to a double or an array of bytes?