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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/webrtc/helpers.h"
namespace media {
webrtc::StreamConfig CreateStreamConfig(const AudioParameters& parameters) {
int channels = parameters.channels();
// Mapping all discrete channel layouts to max two channels assuming that any
// required channel remix takes place in the native audio layer.
if (parameters.channel_layout() == media::CHANNEL_LAYOUT_DISCRETE) {
channels = std::min(parameters.channels(), 2);
}
const int rate = parameters.sample_rate();
const bool has_keyboard = parameters.channel_layout() ==
media::CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC;
// webrtc::StreamConfig requires that the keyboard mic channel is not included
// in the channel count. It may still be used.
if (has_keyboard)
channels -= 1;
return webrtc::StreamConfig(rate, channels, has_keyboard);
}
bool LeftAndRightChannelsAreSymmetric(const AudioBus& audio) {
if (audio.channels() <= 1) {
return true;
}
return std::equal(audio.channel(0), audio.channel(0) + audio.frames(),
audio.channel(1));
}
} // namespace media
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