Add ability to scale to arbitrary factors

webrtc/media/base/videoadapter.h

Index: webrtc/media/base/videoadapter.h
diff --git a/webrtc/media/base/videoadapter.h b/webrtc/media/base/videoadapter.h
index 9d17f5ce1538f5446546f39bee1c391cc7a8f438..a68e5eb7ea008a66906f7b674dbc01ac44ab5a36 100644
--- a/webrtc/media/base/videoadapter.h
+++ b/webrtc/media/base/videoadapter.h
@@ -25,6 +25,7 @@ namespace cricket {
 class VideoAdapter {
  public:
   VideoAdapter();
+  VideoAdapter(int required_resolution_divisor);

[magjed_webrtc, 2016/12/07 13:44:51]

nit: I would name this alignment instead of divisor.

[kthelgason, 2016/12/08 08:42:03]

Done.

   virtual ~VideoAdapter();
 
   // Return the adapted resolution and cropping parameters given the
@@ -63,6 +64,8 @@ class VideoAdapter {
   int adaption_changes_;  // Number of changes in scale factor.
   int previous_width_;    // Previous adapter output width.
   int previous_height_;   // Previous adapter output height.
+  // Resolution must be divisible by this factor.
+  int required_resolution_divisor_;

[magjed_webrtc, 2016/12/07 13:44:51]

const

[kthelgason, 2016/12/08 08:42:03]

Done.

   // The target timestamp for the next frame based on requested format.
   rtc::Optional<int64_t> next_frame_timestamp_ns_ GUARDED_BY(critical_section_);