Send data from mixer to APM limiter more often.

webrtc/modules/audio_mixer/sine_wave_generator.cc

Index: webrtc/modules/audio_mixer/sine_wave_generator.cc
diff --git a/webrtc/modules/audio_mixer/sine_wave_generator.cc b/webrtc/modules/audio_mixer/sine_wave_generator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f16312f1db8fc4a9e6cf220bb3d13e25a7ef3517
--- /dev/null
+++ b/webrtc/modules/audio_mixer/sine_wave_generator.cc
@@ -0,0 +1,33 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/audio_mixer/sine_wave_generator.h"
+
+#include <math.h>
+
+#include "webrtc/base/safe_conversions.h"
+
+namespace webrtc {
+
+namespace {
+constexpr float kPi = 3.14159265f;
+}  // namespace
+
+void SineWaveGenerator::GenerateNextFrame(AudioFrame* frame) {
+  RTC_DCHECK(frame);
+  for (size_t i = 0; i < frame->samples_per_channel_; ++i) {
+    for (size_t ch = 0; ch < frame->num_channels_; ++ch) {
+      frame->data_[frame->num_channels_ * i + ch] =
+          rtc::saturated_cast<int16_t>(amplitude_ * sinf(phase_));
+    }
+    phase_ += wave_frequency_hz_ * 2 * kPi / frame->sample_rate_hz_;
+  }
+}
+}  // namespace webrtc