wav.h

/*
Copyright 2018 Google Inc. All Rights Reserved.
 
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 
    http://www.apache.org/licenses/LICENSE-2.0
 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
 
#ifndef RESONANCE_AUDIO_UTILS_WAV_H_
#define RESONANCE_AUDIO_UTILS_WAV_H_
 
#include <cstdint>
#include <memory>
#include <vector>
 
namespace vraudio {
 
// Wraps WavReader class to decode a wav file into memory.
class Wav {
 public:
  ~Wav();
 
  // Reads a RIFF WAVE from an opened binary stream.
  static std::unique_ptr<const Wav> CreateOrNull(std::istream* binary_stream);
 
  // Returns reference to interleaved samples.
  const std::vector<int16_t>& interleaved_samples() const {
    return interleaved_samples_;
  }
 
  // Returns number of channels.
  size_t GetNumChannels() const { return num_channels_; }
 
  // Returns sample rate.
  int GetSampleRateHz() const { return sample_rate_; }
 
 private:
  // Private constructor used by static factory methods.
  //
  // @param num_channels Number of audio channels.
  // @param sample_rate Sample rate.
  // @param interleaved_samples Decoded interleaved samples.
  Wav(size_t num_channels, int sample_rate,
      std::vector<int16_t>&& interleaved_samples);
 
  // Number of channels.
  size_t num_channels_;
 
  // Sample rate.
  int sample_rate_;
 
  // Interleaved samples.
  std::vector<int16_t> interleaved_samples_;
};
 
}  // namespace vraudio
 
#endif  // RESONANCE_AUDIO_UTILS_WAV_H_