116 lines
3.5 KiB
C++
116 lines
3.5 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 COMMON_AUDIO_WAV_FILE_H_
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#define COMMON_AUDIO_WAV_FILE_H_
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#include <stdint.h>
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#include <cstddef>
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#include <string>
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#include "common_audio/wav_header.h"
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#include "rtc_base/system/file_wrapper.h"
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namespace webrtc {
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// Interface to provide access WAV file parameters.
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class WavFile {
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public:
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enum class SampleFormat { kInt16, kFloat };
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virtual ~WavFile() {}
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virtual int sample_rate() const = 0;
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virtual size_t num_channels() const = 0;
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virtual size_t num_samples() const = 0;
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};
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// Simple C++ class for writing 16-bit integer and 32 bit floating point PCM WAV
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// files. All error handling is by calls to RTC_CHECK(), making it unsuitable
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// for anything but debug code.
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class WavWriter final : public WavFile {
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public:
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// Opens a new WAV file for writing.
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WavWriter(const std::string& filename,
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int sample_rate,
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size_t num_channels,
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SampleFormat sample_format = SampleFormat::kInt16);
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WavWriter(FileWrapper file,
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int sample_rate,
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size_t num_channels,
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SampleFormat sample_format = SampleFormat::kInt16);
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// Closes the WAV file, after writing its header.
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~WavWriter() { Close(); }
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WavWriter(const WavWriter&) = delete;
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WavWriter& operator=(const WavWriter&) = delete;
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// Write additional samples to the file. Each sample is in the range
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// [-32768.0,32767.0], and there must be the previously specified number of
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// interleaved channels.
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void WriteSamples(const float* samples, size_t num_samples);
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void WriteSamples(const int16_t* samples, size_t num_samples);
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int sample_rate() const override { return sample_rate_; }
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size_t num_channels() const override { return num_channels_; }
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size_t num_samples() const override { return num_samples_written_; }
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private:
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void Close();
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const int sample_rate_;
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const size_t num_channels_;
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size_t num_samples_written_;
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WavFormat format_;
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FileWrapper file_;
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};
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// Follows the conventions of WavWriter.
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class WavReader final : public WavFile {
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public:
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// Opens an existing WAV file for reading.
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explicit WavReader(const std::string& filename);
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explicit WavReader(FileWrapper file);
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// Close the WAV file.
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~WavReader() { Close(); }
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WavReader(const WavReader&) = delete;
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WavReader& operator=(const WavReader&) = delete;
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// Resets position to the beginning of the file.
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void Reset();
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// Returns the number of samples read. If this is less than requested,
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// verifies that the end of the file was reached.
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size_t ReadSamples(size_t num_samples, float* samples);
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size_t ReadSamples(size_t num_samples, int16_t* samples);
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int sample_rate() const override { return sample_rate_; }
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size_t num_channels() const override { return num_channels_; }
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size_t num_samples() const override { return num_samples_in_file_; }
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private:
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void Close();
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int sample_rate_;
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size_t num_channels_;
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WavFormat format_;
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size_t num_samples_in_file_;
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size_t num_unread_samples_;
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FileWrapper file_;
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int64_t
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data_start_pos_; // Position in the file immediately after WAV header.
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};
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} // namespace webrtc
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#endif // COMMON_AUDIO_WAV_FILE_H_
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