Cast: improve AV sync in sender application

Cast: improve AV sync in sender application

This change is to improve AV sync for transcoding.

The algorithm is now changed to schedule for trancoding every 10ms.
And then trasncoding audio into 10 ms blocks and send to the network.
Video is then transcoded according to the audio timeline.

I have also added looping support.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266125

[hubbe, 2014-04-24 22:32:51]

LGTM + nits

https://codereview.chromium.org/255473005/diff/40001/media/cast/test/sender.cc
File media/cast/test/sender.cc (right):

https://codereview.chromium.org/255473005/diff/40001/media/cast/test/sender.c...
media/cast/test/sender.cc:415: // playback rate is 1.0.
Odd comment, what do we use if playback rate is not 1.0?

https://codereview.chromium.org/255473005/diff/40001/media/cast/test/sender.c...
media/cast/test/sender.cc:457: clock_->NowTicks() - start_time_));
weird indentation.

https://codereview.chromium.org/255473005/diff/40001/media/cast/test/sender.c...
media/cast/test/sender.cc:460: audio_sent_ts_->GetTimestamp()));
weird indentation

[Alpha Left Google, 2014-04-25 00:54:15]

Fixed all comments.

[Alpha Left Google, 2014-04-25 00:54:19]

The CQ bit was checked by hclam@chromium.org

[commit-bot: I haz the power, 2014-04-25 00:58:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hclam@chromium.org/255473005/50001

[commit-bot: I haz the power, 2014-04-25 03:44:32]

Change committed as 266125