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There are currently a number of places in the code where we dump audio data in various stages of processing for debug purposes. Currently these all write raw, uncompressed PCM files, which isn't supported by the most common audio players, and requires the user to supply metadata such as sample rate, sample size and endianness, etc. This patch adds a simple class that makes it easy to write WAV files instead. WAV files still contain the same uncompressed PCM data, but they have a small header that contains all the requisite metadata, and are supported by virtually all audio players. Since some of the debug code that will be writing WAV files is written in plain C, a C API is included as well. R=andrew@webrtc.org, bjornv@webrtc.org, henrike@webrtc.org, tommi@webrtc.org Review URL: https://webrtc-codereview.appspot.com/16809004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6932 4adac7df-926f-26a2-2b94-8c16560cd09d