libavsync: support 1:1 pattern [2/2]

PD#SWPL-47453

Problem:
* Fail to keep 1:1 pattern when the output is 60fps and stream is 60fps.
* The video start PTS doesn't take delay into consideration.

Solution:
Add 1:1 pattern support
Video start PTS will take delay inside.

Verify:
U212 Cobalt cert

Change-Id: I9c710080847ea8405031040f12a7fc41c7a070c3
3 files changed
tree: 75e6000aada4072f300bd0e863b6cd74bb71e856
  1. src/
  2. avsync-lib.mk
  3. Config.in
  4. Makefile