| /* |
| * Copyright (C) 2014 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_CHANNELS_H |
| #define ANDROID_AUDIO_CHANNELS_H |
| |
| __BEGIN_DECLS |
| |
| /* |
| * Expands or contracts sample data from one interleaved channel format to another. |
| * Expanded channels are filled with zeros and put at the end of each audio frame. |
| * Contracted channels are omitted from the end of each audio frame. |
| * in_buff points to the buffer of samples |
| * in_buff_channels Specifies the number of channels in the input buffer. |
| * out_buff points to the buffer to receive converted samples. |
| * out_buff_channels Specifies the number of channels in the output buffer. |
| * sample_size_in_bytes Specifies the number of bytes per sample. 1, 2, 3, 4 are |
| * currently valid. |
| * num_in_bytes size of input buffer in BYTES |
| * returns |
| * the number of BYTES of output data or 0 if an error occurs. |
| * NOTE |
| * The out and sums buffers must either be completely separate (non-overlapping), or |
| * they must both start at the same address. Partially overlapping buffers are not supported. |
| */ |
| size_t adjust_channels(const void* in_buff, size_t in_buff_chans, |
| void* out_buff, size_t out_buff_chans, |
| unsigned sample_size_in_bytes, size_t num_in_bytes); |
| __END_DECLS |
| |
| #endif |
