| /* |
| * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_PCM_UTILS_H_ |
| #define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_PCM_UTILS_H_ |
| |
| #include <inttypes.h> |
| #include <stdio.h> |
| |
| // Utilities for reading from and writing to multichannel pcm files. |
| // Assumes a bit depth of 16 and little-endian. Note that in these functions, |
| // length refers to the number of samples to read from/write to the file, |
| // such that length / num_channels is the number of frames. |
| namespace webrtc { |
| |
| // Reads audio from a pcm into a 2D array: buffer[channel_index][frame_index]. |
| // Returns the number of frames written. If this is less than |length|, it's |
| // safe to assume the end-of-file was reached, as otherwise this will crash. |
| // In PcmReadToFloat, the floats are within the range [-1, 1]. |
| size_t PcmRead(FILE* file, |
| size_t length, |
| int num_channels, |
| int16_t* const* buffer); |
| size_t PcmReadToFloat(FILE* file, |
| size_t length, |
| int num_channels, |
| float* const* buffer); |
| |
| // Writes to a pcm file. The resulting file contains the channels interleaved. |
| // Crashes if the correct number of frames aren't written to the file. For |
| // PcmWriteFromFloat, floats must be within the range [-1, 1]. |
| void PcmWrite(FILE* file, |
| size_t length, |
| int num_channels, |
| const int16_t* const* buffer); |
| void PcmWriteFromFloat(FILE* file, |
| size_t length, |
| int num_channels, |
| const float* const* buffer); |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_PCM_UTILS_H_ |