print_rms.cc

Go to the documentation of this file.

// Copyright (c) 2017, The Regents of the University of California
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
//   notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
// * Neither the name of the University of California nor the
//   names of its contributors may be used to endorse or promote products
//   derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

#include <cmath>

#include "cogrob/cloud/speech/record_audio.h"
#include "third_party/gflags.h"
#include "third_party/glog.h"
#include "util/simple_thread_safe_queue.h"

namespace speech = ::cogrob::cloud::speech;
using speech::AudioSample;

int main(int argc, char *argv[]) {
  google::InitGoogleLogging(argv[0]);
  google::LogToStderr();
  gflags::SetUsageMessage("PrintRMS utility for testing microphone.");
  gflags::SetVersionString("1.0.0");
  gflags::ParseCommandLineFlags(&argc, &argv, true);

  util::SimpleThreadSafeQueue<std::unique_ptr<AudioSample>> audio_queue;
  speech::AudioRecorder recorder(&audio_queue);
  while (true) {
    std::unique_ptr<AudioSample> sample = std::move(audio_queue.blocking_pop());
    double square_sum = 0;
    for (size_t i = 0; i < sample->size(); i += 2) {
      int s = (static_cast<int8_t>((*sample)[i + 1])) << 8 | (*sample)[i];
      square_sum += s * s;
    }
    double rms = std::sqrt(square_sum / (sample->size() / 2));
    LOG(INFO) << "RMS: " << rms;
  }
}