transient_detector_unittest.cc

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/*

 *  Copyright (c) 2013 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.

*/

#include "modules/audio_processing/transient/transient_detector.h"

#include <memory>

#include <string>

#include "modules/audio_processing/transient/common.h"

#include "modules/audio_processing/transient/file_utils.h"

#include "rtc_base/strings/string_builder.h"

#include "rtc_base/system/file_wrapper.h"

#include "test/gtest.h"

#include "test/testsupport/file_utils.h"

namespace webrtc {

static const int kSampleRatesHz[] = {ts::kSampleRate8kHz, ts::kSampleRate16kHz,

                                     ts::kSampleRate32kHz,

                                     ts::kSampleRate48kHz};

static const size_t kNumberOfSampleRates =

    sizeof(kSampleRatesHz) / sizeof(*kSampleRatesHz);

// This test is for the correctness of the transient detector.

// Checks the results comparing them with the ones stored in the detect files in

// the directory: resources/audio_processing/transient/

// The files contain all the results in double precision (Little endian).

// The audio files used with different sample rates are stored in the same

// directory.

#if defined(WEBRTC_IOS)

TEST(TransientDetectorTest, DISABLED_CorrectnessBasedOnFiles) {

#else

TEST(TransientDetectorTest, CorrectnessBasedOnFiles) {

#endif

  for (size_t i = 0; i < kNumberOfSampleRates; ++i) {

    int sample_rate_hz = kSampleRatesHz[i];

    // Prepare detect file.

    rtc::StringBuilder detect_file_name;

    detect_file_name << "audio_processing/transient/detect"

                     << (sample_rate_hz / 1000) << "kHz";

    FileWrapper detect_file = FileWrapper::OpenReadOnly(

        test::ResourcePath(detect_file_name.str(), "dat"));

    bool file_opened = detect_file.is_open();

    ASSERT_TRUE(file_opened) << "File could not be opened.\n"

                             << detect_file_name.str().c_str();

    // Prepare audio file.

    rtc::StringBuilder audio_file_name;

    audio_file_name << "audio_processing/transient/audio"

                    << (sample_rate_hz / 1000) << "kHz";

    FileWrapper audio_file = FileWrapper::OpenReadOnly(

        test::ResourcePath(audio_file_name.str(), "pcm"));

    // Create detector.

    TransientDetector detector(sample_rate_hz);

    const size_t buffer_length = sample_rate_hz * ts::kChunkSizeMs / 1000;

    std::unique_ptr<float[]> buffer(new float[buffer_length]);

    const float kTolerance = 0.02f;

    size_t frames_read = 0;

    while (ReadInt16FromFileToFloatBuffer(&audio_file, buffer_length,

                                          buffer.get()) == buffer_length) {

      ++frames_read;

      float detector_value =

          detector.Detect(buffer.get(), buffer_length, NULL, 0);

      double file_value;

      ASSERT_EQ(1u, ReadDoubleBufferFromFile(&detect_file, 1, &file_value))

          << "Detect test file is malformed.\n";

      // Compare results with data from the matlab test file.

      EXPECT_NEAR(file_value, detector_value, kTolerance)

          << "Frame: " << frames_read;

    detect_file.Close();

    audio_file.Close();

}  // namespace webrtc