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/*
* 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_
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