sdk/android/src/java/org/webrtc/FramerateBitrateAdjuster.java

/*
 *  Copyright 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.
 */

package org.webrtc;

/**
 * BitrateAdjuster that adjusts the bitrate to compensate for changes in the framerate.  Used with
 * hardware codecs that assume the framerate never changes.
 */
class FramerateBitrateAdjuster extends BaseBitrateAdjuster {
  private static final int INITIAL_FPS = 30;

  @Override
  public void setTargets(int targetBitrateBps, int targetFps) {
    if (this.targetFps == 0) {
      // Framerate-based bitrate adjustment always initializes to the same framerate.
      targetFps = INITIAL_FPS;
    }
    super.setTargets(targetBitrateBps, targetFps);

    this.targetBitrateBps = this.targetBitrateBps * INITIAL_FPS / this.targetFps;
  }

  @Override
  public int getCodecConfigFramerate() {
    return INITIAL_FPS;
  }
}