5bcc00e538
The folder structure is now as was agreed on in the 'Slim and Modular WebRTC' effort. Also added some dependencies that were previously in another part of the tree. NOTRY=True Review-Url: https://codereview.webrtc.org/2238803002 Cr-Commit-Position: refs/heads/master@{#13742}
63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/audio_mixer/audio_frame_manipulator.h"
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#include "webrtc/modules/include/module_common_types.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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namespace {
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// Linear ramping over 80 samples.
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// TODO(hellner): ramp using fix point?
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const float kRampArray[] = {
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0.0000f, 0.0127f, 0.0253f, 0.0380f, 0.0506f, 0.0633f, 0.0759f, 0.0886f,
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0.1013f, 0.1139f, 0.1266f, 0.1392f, 0.1519f, 0.1646f, 0.1772f, 0.1899f,
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0.2025f, 0.2152f, 0.2278f, 0.2405f, 0.2532f, 0.2658f, 0.2785f, 0.2911f,
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0.3038f, 0.3165f, 0.3291f, 0.3418f, 0.3544f, 0.3671f, 0.3797f, 0.3924f,
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0.4051f, 0.4177f, 0.4304f, 0.4430f, 0.4557f, 0.4684f, 0.4810f, 0.4937f,
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0.5063f, 0.5190f, 0.5316f, 0.5443f, 0.5570f, 0.5696f, 0.5823f, 0.5949f,
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0.6076f, 0.6203f, 0.6329f, 0.6456f, 0.6582f, 0.6709f, 0.6835f, 0.6962f,
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0.7089f, 0.7215f, 0.7342f, 0.7468f, 0.7595f, 0.7722f, 0.7848f, 0.7975f,
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0.8101f, 0.8228f, 0.8354f, 0.8481f, 0.8608f, 0.8734f, 0.8861f, 0.8987f,
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0.9114f, 0.9241f, 0.9367f, 0.9494f, 0.9620f, 0.9747f, 0.9873f, 1.0000f};
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const size_t kRampSize = sizeof(kRampArray) / sizeof(kRampArray[0]);
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} // namespace
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uint32_t NewMixerCalculateEnergy(const AudioFrame& audio_frame) {
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uint32_t energy = 0;
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for (size_t position = 0; position < audio_frame.samples_per_channel_;
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position++) {
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// TODO(andrew): this can easily overflow.
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energy += audio_frame.data_[position] * audio_frame.data_[position];
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}
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return energy;
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}
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void NewMixerRampIn(AudioFrame* audio_frame) {
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assert(kRampSize <= audio_frame->samples_per_channel_);
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for (size_t i = 0; i < kRampSize; i++) {
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audio_frame->data_[i] =
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static_cast<int16_t>(kRampArray[i] * audio_frame->data_[i]);
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}
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}
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void NewMixerRampOut(AudioFrame* audio_frame) {
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assert(kRampSize <= audio_frame->samples_per_channel_);
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for (size_t i = 0; i < kRampSize; i++) {
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const size_t kRampPos = kRampSize - 1 - i;
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audio_frame->data_[i] =
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static_cast<int16_t>(kRampArray[kRampPos] * audio_frame->data_[i]);
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}
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memset(&audio_frame->data_[kRampSize], 0,
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(audio_frame->samples_per_channel_ - kRampSize) *
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sizeof(audio_frame->data_[0]));
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}
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} // namespace webrtc
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