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