Audio mixing API in ANSI C

A real-time audio mixing API in C which will mix a number of audio buffers together into a final stereo stream (signed 16 bit). ## Deliverables I need a function to which you can pass samples, and the samples will be mixed together into a final stereo output buffer that I can stream to any audio API like DirectSound or WinMm. I will read several different audio files from disk in streams, and pass the samples to this function which needs to produce a mixdown of the multiple streams so that we get an output buffer with interleaved stereo samples in signed 16 bit. The function must make sure that the audio never clips, and that there is no distortion or other problems as a result of the mixing. The output must be smooth, just like when you load many sounds at once in DirectSound; there must be no audible clicks or sudden changes in volume etc. The function could look something like this: add_samples(short* sample_array, long size); And you call the function once for every stream that you read from, and then you retrieve the primary buffer when you have given the API a block from each stream to work with. I will specify the size of the primary output buffer, and the API needs to buffer audio that could not be mixed in the previous buffer to the next so that there are no breakups. The source buffers may well be of different sizes, but it's fine to set a minimum required amount of samples to make the mixing job easier. Imagine the concept of adding secondary buffers in DirectSound to the primary buffer, I need the same functionality here. 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows? (depending on the nature? of the deliverables): a)? For web sites or? other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software? installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Windows - ANSI C