1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_AUDIO_CONVERSION_H
18#define ANDROID_AUDIO_CONVERSION_H
19#include <stdint.h>
20#include <sys/cdefs.h>
21#include <system/audio.h>
22
23/** \cond */
24__BEGIN_DECLS
25/** \endcond */
26
27// for in-place conversion routines
28
29/**
30 * In-place mono blend using the arithmetic average of the channels in each audio frame.
31 *
32 *   \param buf          buffer of frames
33 *   \param format       one of AUDIO_FORMAT_PCM_16_BIT or AUDIO_FORMAT_PCM_FLOAT
34 *   \param channelCount number of channels per frame
35 *   \param frames       number of frames in buffer
36 *   \param limit        whether to use a limiter (experimental, currently only for stereo float)
37 *
38 * \return
39 *   none
40 *
41 */
42
43void mono_blend(void *buf, audio_format_t format, size_t channelCount, size_t frames,
44        bool limit = false);
45
46/** \cond */
47__END_DECLS
48/** \endcond */
49
50#endif
51