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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_MODULES_AUDIO_PROCESSING_TRANSIENT_FILE_UTILS_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_FILE_UTILS_H_
#include <string.h>
#include "webrtc/system_wrappers/interface/file_wrapper.h"
#include "webrtc/typedefs.h"
namespace webrtc {
// This is a copy of the cast included in the Chromium codebase here:
// http://cs.chromium.org/src/third_party/cld/base/casts.h
template <class Dest, class Source>
inline Dest bit_cast(const Source& source) {
// A compile error here means your Dest and Source have different sizes.
static_assert(sizeof(Dest) == sizeof(Source),
"Dest and Source have different sizes");
Dest dest;
memcpy(&dest, &source, sizeof(dest));
return dest;
}
// Converts the byte array with binary float representation to float.
// Bytes must be in little-endian order.
// Returns 0 if correct, -1 on error.
int ConvertByteArrayToFloat(const uint8_t bytes[4], float* out);
// Converts the byte array with binary double representation to double.
// Bytes must be in little-endian order.
// Returns 0 if correct, -1 on error.
int ConvertByteArrayToDouble(const uint8_t bytes[8], double* out);
// Converts a float to a byte array with binary float representation.
// Bytes will be in little-endian order.
// Returns 0 if correct, -1 on error.
int ConvertFloatToByteArray(float value, uint8_t out_bytes[4]);
// Converts a double to a byte array with binary double representation.
// Bytes will be in little-endian order.
// Returns 0 if correct, -1 on error.
int ConvertDoubleToByteArray(double value, uint8_t out_bytes[8]);
// Reads |length| 16-bit integers from |file| to |buffer|.
// |file| must be previously opened.
// Returns the number of 16-bit integers read or -1 on error.
size_t ReadInt16BufferFromFile(FileWrapper* file,
size_t length,
int16_t* buffer);
// Reads |length| 16-bit integers from |file| and stores those values
// (converting them) in |buffer|.
// |file| must be previously opened.
// Returns the number of 16-bit integers read or -1 on error.
size_t ReadInt16FromFileToFloatBuffer(FileWrapper* file,
size_t length,
float* buffer);
// Reads |length| 16-bit integers from |file| and stores those values
// (converting them) in |buffer|.
// |file| must be previously opened.
// Returns the number of 16-bit integers read or -1 on error.
size_t ReadInt16FromFileToDoubleBuffer(FileWrapper* file,
size_t length,
double* buffer);
// Reads |length| floats in binary representation (4 bytes) from |file| to
// |buffer|.
// |file| must be previously opened.
// Returns the number of floats read or -1 on error.
size_t ReadFloatBufferFromFile(FileWrapper* file, size_t length, float* buffer);
// Reads |length| doubles in binary representation (8 bytes) from |file| to
// |buffer|.
// |file| must be previously opened.
// Returns the number of doubles read or -1 on error.
size_t ReadDoubleBufferFromFile(FileWrapper* file,
size_t length,
double* buffer);
// Writes |length| 16-bit integers from |buffer| in binary representation (2
// bytes) to |file|. It flushes |file|, so after this call there are no
// writings pending.
// |file| must be previously opened.
// Returns the number of doubles written or -1 on error.
size_t WriteInt16BufferToFile(FileWrapper* file,
size_t length,
const int16_t* buffer);
// Writes |length| floats from |buffer| in binary representation (4 bytes) to
// |file|. It flushes |file|, so after this call there are no writtings pending.
// |file| must be previously opened.
// Returns the number of doubles written or -1 on error.
size_t WriteFloatBufferToFile(FileWrapper* file,
size_t length,
const float* buffer);
// Writes |length| doubles from |buffer| in binary representation (8 bytes) to
// |file|. It flushes |file|, so after this call there are no writings pending.
// |file| must be previously opened.
// Returns the number of doubles written or -1 on error.
size_t WriteDoubleBufferToFile(FileWrapper* file,
size_t length,
const double* buffer);
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_FILE_UTILS_H_
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