Cis631-spectrogram is a project mainly written in C++, it's free.
encodes image as sound
time it took to run imgEncode on rain_nellie.png (4 minutes!)
[~/cis631/hw/project2/code/imageEncoder] [sydes@mist] [12:55 AM] $ time ./imgEncode rain_nellie.png real 4m48.828s user 4m48.082s sys 0m0.092s