The callback function is passed information about the decoding process (such as total bytes converted and frame count) as it decodes, which in turn can be used to update decoding status in whatever interface the developer chooses. Madlldlib is codified into a single, simple interface, consisting of just one function, CbMpegAudioDecoder(), which takes the names of the input and output files, and a callback function as parameters. However, a brief overview of the source is in order.
The DLL source is well documented, so I will concentrate on using the API, and allow the curious to poke around the guts on their own (it is likely that the API is of most interest to most people).
I have written code (based on the source madlld) that compiles to a DLL, enabling other languages (i.e., C#, Visual Basic etc.) to access the libmad library using the simple interface I've provided. However, it compiles as a static library, limiting its access to C/C++. Libmad is a powerful open source library written in C that decodes MP3 files to uncompressed PCM data.
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