Changed ramping functionality of the AudioMixer.

webrtc/modules/audio_mixer/audio_frame_manipulator.h

Index: webrtc/modules/audio_mixer/audio_frame_manipulator.h
diff --git a/webrtc/modules/audio_mixer/audio_frame_manipulator.h b/webrtc/modules/audio_mixer/audio_frame_manipulator.h
index e0ba7eb24a42d2aa557839168b39d08c15db1da9..d3714705b88028641ce0e08e5b7159c27be4a3cd 100644
--- a/webrtc/modules/audio_mixer/audio_frame_manipulator.h
+++ b/webrtc/modules/audio_mixer/audio_frame_manipulator.h
@@ -19,9 +19,9 @@ namespace webrtc {
 // Updates the audioFrame's energy (based on its samples).
 uint32_t AudioMixerCalculateEnergy(const AudioFrame& audio_frame);
 
-// Apply linear step function that ramps in/out the audio samples in audio_frame
-void NewMixerRampIn(AudioFrame* audio_frame);
-void NewMixerRampOut(AudioFrame* audio_frame);
+// Ramps up or down the provided audio frame. Ramp(frame, 0, 1) will

[the sun, 2016/10/11 18:04:13]

nit: arguments to Ramp() in comment are in wrong order

[aleloi, 2016/10/12 08:43:10]

Done.

+// linearly increase the samples in the frame from 0 to full volume.
+void Ramp(float current, float target, AudioFrame* audio_frame);

[the sun, 2016/10/11 18:04:13]

use start_gain and target_gain instead.

[aleloi, 2016/10/12 08:43:10]

Done.

 
 // Downmixes or upmixes a frame between stereo and mono.
 void RemixFrame(size_t target_number_of_channels, AudioFrame* frame);