Add audio and video parameters for setting media constraints.
- These replace the media parameter, now removed.
- Organize the parameter getting a bit.
To describe the new parameters, I'll just copy the code comments here:
Use "audio" and "video" to set the media stream constraints. "true" and
"false" are recognized and interpreted as bools, for example:
"?audio=true&video=false" (start an audio-only call).
"?audio=false" (start a video-only call)
If unspecified, the constraint defaults to True.
audio-specific parsing:
To set certain constraints, pass in a comma-separated list of audio
constraint strings. If preceded by a "-", the constraint will be set to
False, and otherwise to True. There is no validation of constraint
strings. Examples:
"?audio=googEchoCancellation" (enables echo cancellation)
"?audio=-googEchoCancellation,googAutoGainControl" (disables echo
cancellation and enables gain control)
TESTED=Verified that passing true, false and various audio constraints
has the desired effect in apprtc.
R=vikasmarwaha@google.com
Review URL: https://webrtc-codereview.appspot.com/2345004
git-svn-id: http://webrtc.googlecode.com/svn/trunk@4919 4adac7df-926f-26a2-2b94-8c16560cd09d
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