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/*
* Copyright (c) 2013 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_COMMON_AUDIO_INCLUDE_AUDIO_UTIL_H_
#define WEBRTC_COMMON_AUDIO_INCLUDE_AUDIO_UTIL_H_
#include "webrtc/typedefs.h"
namespace webrtc {
// Clamp the floating |value| to the range representable by an int16_t.
static inline float ClampInt16(float value) {
const float kMaxInt16 = 32767.f;
const float kMinInt16 = -32768.f;
return value < kMinInt16 ? kMinInt16 :
(value > kMaxInt16 ? kMaxInt16 : value);
}
// Return a rounded int16_t of the floating |value|. Doesn't handle overflow;
// use ClampInt16 if necessary.
static inline int16_t RoundToInt16(float value) {
return static_cast<int16_t>(value < 0.f ? value - 0.5f : value + 0.5f);
}
// Deinterleave audio from |interleaved| to the channel buffers pointed to
// by |deinterleaved|. There must be sufficient space allocated in the
// |deinterleaved| buffers (|num_channel| buffers with |samples_per_channel|
// per buffer).
void Deinterleave(const int16_t* interleaved, int samples_per_channel,
int num_channels, int16_t** deinterleaved);
// Interleave audio from the channel buffers pointed to by |deinterleaved| to
// |interleaved|. There must be sufficient space allocated in |interleaved|
// (|samples_per_channel| * |num_channels|).
void Interleave(const int16_t* const* deinterleaved, int samples_per_channel,
int num_channels, int16_t* interleaved);
} // namespace webrtc
#endif // WEBRTC_COMMON_AUDIO_INCLUDE_AUDIO_UTIL_H_
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