51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIO_MONO_BLEND_H
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#define ANDROID_AUDIO_MONO_BLEND_H
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#include <stdint.h>
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#include <sys/cdefs.h>
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#include <system/audio.h>
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/** \cond */
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__BEGIN_DECLS
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/** \endcond */
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// for in-place conversion routines
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/**
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* In-place mono blend using the arithmetic average of the channels in each audio frame.
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*
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* \param buf buffer of frames
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* \param format one of AUDIO_FORMAT_PCM_16_BIT or AUDIO_FORMAT_PCM_FLOAT
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* \param channelCount number of channels per frame
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* \param frames number of frames in buffer
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* \param limit whether to use a limiter (experimental, currently only for stereo float)
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*
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* \return
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* none
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*
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*/
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void mono_blend(void *buf, audio_format_t format, size_t channelCount, size_t frames,
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bool limit = false);
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/** \cond */
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__END_DECLS
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/** \endcond */
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#endif // !ANDROID_AUDIO_MONO_BLEND_H
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