0c39e91cc8
R=andrew@webrtc.org Review URL: https://webrtc-codereview.appspot.com/34529004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7958 4adac7df-926f-26a2-2b94-8c16560cd09d
51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_PCM_UTILS_H_
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#define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_PCM_UTILS_H_
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#include <inttypes.h>
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#include <stdio.h>
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// Utilities for reading from and writing to multichannel pcm files.
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// Assumes a bit depth of 16 and little-endian. Note that in these functions,
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// length refers to the number of samples to read from/write to the file,
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// such that length / num_channels is the number of frames.
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namespace webrtc {
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// Reads audio from a pcm into a 2D array: buffer[channel_index][frame_index].
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// Returns the number of frames written. If this is less than |length|, it's
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// safe to assume the end-of-file was reached, as otherwise this will crash.
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// In PcmReadToFloat, the floats are within the range [-1, 1].
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size_t PcmRead(FILE* file,
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size_t length,
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int num_channels,
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int16_t* const* buffer);
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size_t PcmReadToFloat(FILE* file,
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size_t length,
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int num_channels,
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float* const* buffer);
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// Writes to a pcm file. The resulting file contains the channels interleaved.
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// Crashes if the correct number of frames aren't written to the file. For
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// PcmWriteFromFloat, floats must be within the range [-1, 1].
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void PcmWrite(FILE* file,
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size_t length,
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int num_channels,
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const int16_t* const* buffer);
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void PcmWriteFromFloat(FILE* file,
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size_t length,
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int num_channels,
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const float* const* buffer);
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_PCM_UTILS_H_
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