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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 COMMON_AUDIO_WAV_FILE_H_
#define COMMON_AUDIO_WAV_FILE_H_
#include <stdint.h>
#include <cstddef>
#include <string>
#include "rtc_base/constructor_magic.h"
#include "rtc_base/platform_file.h"
#include "rtc_base/system/file_wrapper.h"
namespace webrtc {
// Interface to provide access to WAV file parameters.
class WavFile {
public:
virtual ~WavFile() {}
virtual int sample_rate() const = 0;
virtual size_t num_channels() const = 0;
virtual size_t num_samples() const = 0;
};
// Simple C++ class for writing 16-bit PCM WAV files. All error handling is
// by calls to RTC_CHECK(), making it unsuitable for anything but debug code.
class WavWriter final : public WavFile {
public:
// Open a new WAV file for writing.
WavWriter(const std::string& filename, int sample_rate, size_t num_channels);
// Open a new WAV file for writing.
WavWriter(FileWrapper file, int sample_rate, size_t num_channels);
// Close the WAV file, after writing its header.
~WavWriter() override;
// Write additional samples to the file. Each sample is in the range
// [-32768,32767], and there must be the previously specified number of
// interleaved channels.
void WriteSamples(const float* samples, size_t num_samples);
void WriteSamples(const int16_t* samples, size_t num_samples);
int sample_rate() const override;
size_t num_channels() const override;
size_t num_samples() const override;
private:
void Close();
const int sample_rate_;
const size_t num_channels_;
size_t num_samples_; // Total number of samples written to file.
FileWrapper file_; // Output file, owned by this class
RTC_DISALLOW_COPY_AND_ASSIGN(WavWriter);
};
// Follows the conventions of WavWriter.
class WavReader final : public WavFile {
public:
// Opens an existing WAV file for reading.
explicit WavReader(const std::string& filename);
// Close the WAV file.
~WavReader() override;
// Resets position to the beginning of the file.
void Reset();
// Returns the number of samples read. If this is less than requested,
// verifies that the end of the file was reached.
size_t ReadSamples(size_t num_samples, float* samples);
size_t ReadSamples(size_t num_samples, int16_t* samples);
int sample_rate() const override;
size_t num_channels() const override;
size_t num_samples() const override;
private:
// Opens an existing WAV file for reading.
explicit WavReader(rtc::PlatformFile file);
void Close();
int sample_rate_;
size_t num_channels_;
size_t num_samples_; // Total number of samples in the file.
size_t num_samples_remaining_;
FILE* file_handle_; // Input file, owned by this class.
fpos_t data_start_pos_; // Position in the file immediately after WAV header.
RTC_DISALLOW_COPY_AND_ASSIGN(WavReader);
};
} // namespace webrtc
#endif // COMMON_AUDIO_WAV_FILE_H_