tree 2a86c9bf772e7da5d2557f45d6c69d1bd6b5640f
parent 3b44b3cf0cfed96eea7edd1c3bbe689e0f44a736
author andrew@webrtc.org <andrew@webrtc.org> 1418761041 +0000
committer andrew@webrtc.org <andrew@webrtc.org> 1418761041 +0000

Handle all permissible PCM fields with WavReader.

I discovered the hard way that Adobe Audition writes an 18 byte format
header with an extra (zero) extension size field. Although:
https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
indicates this field shouldn't exist for PCM, the documentation here:
http://www-mmsp.ece.mcgill.ca/documents/AudioFormats/WAVE/WAVE.html
doesn't list it as strictly forbidden, only that it _must_ exist for
non-PCM formats.

Audition can write metadata to the file after the audio data, which is
also not forbidden. We now ensure to read only up to the audio payload
length to avoid reading the metadata.

R=aluebs@webrtc.org, kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/33629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@7915 4adac7df-926f-26a2-2b94-8c16560cd09d