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- two configurations availables(22050Hz-32kbps and 44100Hz-64kbps)
- fixed frame size of 512 samples(11.6 or 23ms depending on
sampling rate.
- one frame per RPT packet.
- this is a first implementation to be cleaned

improve dtmf generation on iOS

add accessors to loss and late rates.

quality indicator enhancement: make it use locally computed statistics every seconds, so that its state reflects the quality in a more realtime manner.

- enhance mediastream tool so that lossrate can be changed in --interactive mode.

Make it the default choice.

Use the kAudioSessionSetActiveFlag_NotifyOthersOnDeactivation flag when deactivating the audio session.

This enables music playing to be restored when a call terminates.

MS_AUDIO_ENCODER_SET_PTIME
MS_AUDIO_ENCODER_GET_PTIME

in the purpose of allowing easy access of ptime for bitrate driver (adaptive rate control algorithm).

Encoders are no longer required to parse "ptime" parameter from fmtp, but instead they should implement these new methods.

Improve protection agains bufferoverflows
Improve multi thread data access protection