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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 "common_audio/wav_header.h"
#include "rtc_base/system/file_wrapper.h"
namespace webrtc {
// Interface to provide access WAV file parameters.
class WavFile {
public:
enum class SampleFormat { kInt16, kFloat };
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 integer and 32 bit floating point 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:
// Opens a new WAV file for writing.
WavWriter(absl::string_view filename,
int sample_rate,
size_t num_channels,
SampleFormat sample_format = SampleFormat::kInt16);
WavWriter(FileWrapper file,
int sample_rate,
size_t num_channels,
SampleFormat sample_format = SampleFormat::kInt16);
// Closes the WAV file, after writing its header.
~WavWriter() { Close(); }
WavWriter(const WavWriter&) = delete;
WavWriter& operator=(const WavWriter&) = delete;
// Write additional samples to the file. Each sample is in the range
// [-32768.0,32767.0], 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 { return sample_rate_; }
size_t num_channels() const override { return num_channels_; }
size_t num_samples() const override { return num_samples_written_; }
private:
void Close();
const int sample_rate_;
const size_t num_channels_;
size_t num_samples_written_;
WavFormat format_;
FileWrapper file_;
};
// Follows the conventions of WavWriter.
class WavReader final : public WavFile {
public:
// Opens an existing WAV file for reading.
explicit WavReader(absl::string_view filename);
explicit WavReader(FileWrapper file);
// Close the WAV file.
~WavReader() { Close(); }
WavReader(const WavReader&) = delete;
WavReader& operator=(const WavReader&) = delete;
// 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 { return sample_rate_; }
size_t num_channels() const override { return num_channels_; }
size_t num_samples() const override { return num_samples_in_file_; }
private:
void Close();
int sample_rate_;
size_t num_channels_;
WavFormat format_;
size_t num_samples_in_file_;
size_t num_unread_samples_;
FileWrapper file_;
int64_t
data_start_pos_; // Position in the file immediately after WAV header.
};
} // namespace webrtc
#endif // COMMON_AUDIO_WAV_FILE_H_
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