audio_frame_manipulator.h (1171B)
1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_AUDIO_MIXER_AUDIO_FRAME_MANIPULATOR_H_ 12 #define MODULES_AUDIO_MIXER_AUDIO_FRAME_MANIPULATOR_H_ 13 14 #include <stddef.h> 15 #include <stdint.h> 16 17 #include "api/audio/audio_frame.h" 18 19 namespace webrtc { 20 21 // Updates the audioFrame's energy (based on its samples). 22 uint32_t AudioMixerCalculateEnergy(const AudioFrame& audio_frame); 23 24 // Ramps up or down the provided audio frame. Ramp(0, 1, frame) will 25 // linearly increase the samples in the frame from 0 to full volume. 26 void Ramp(float start_gain, float target_gain, AudioFrame* audio_frame); 27 28 // Downmixes or upmixes a frame between stereo and mono. 29 void RemixFrame(size_t target_number_of_channels, AudioFrame* frame); 30 31 } // namespace webrtc 32 33 #endif // MODULES_AUDIO_MIXER_AUDIO_FRAME_MANIPULATOR_H_