/*
* Copyright (c) 2011 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 <stddef.h> // size_t
#include <stdlib.h>
#include "gtest/gtest.h"
#include "typedefs.h"
#include "webrtc_vad.h"
// TODO(bjornv): Move the internal unit tests to separate files.
extern "C" {
#include "vad_core.h"
#include "vad_gmm.h"
#include "vad_sp.h"
}
namespace webrtc {
namespace {
const int16_t kModes[] = { 0, 1, 2, 3 };
const size_t kModesSize = sizeof(kModes) / sizeof(*kModes);
// Rates we support.
const int16_t kRates[] = { 8000, 12000, 16000, 24000, 32000 };
const size_t kRatesSize = sizeof(kRates) / sizeof(*kRates);
// Frame lengths we support.
const int16_t kMaxFrameLength = 960;
const int16_t kFrameLengths[] = { 80, 120, 160, 240, 320, 480, 640,
kMaxFrameLength };
const size_t kFrameLengthsSize = sizeof(kFrameLengths) / sizeof(*kFrameLengths);
// Returns true if the rate and frame length combination is valid.
bool ValidRatesAndFrameLengths(int16_t rate, int16_t frame_length) {
if (rate == 8000) {
if (frame_length == 80 || frame_length == 160 || frame_length == 240) {
return true;
}
return false;
} else if (rate == 16000) {
if (frame_length == 160 || frame_length == 320 || frame_length == 480) {
return true;
}
return false;
}
if (rate == 32000) {
if (frame_length == 320 || frame_length == 640 || frame_length == 960) {
return true;
}
return false;
}
return false;
}
class VadTest : public ::testing::Test {
protected:
VadTest();
virtual void SetUp();
virtual void TearDown();
};
VadTest::VadTest() {
}
void VadTest::SetUp() {
}
void VadTest::TearDown() {
}
TEST_F(VadTest, ApiTest) {
// This API test runs through the APIs for all possible valid and invalid
// combinations.
VadInst* handle = NULL;
int16_t zeros[kMaxFrameLength] = { 0 };
// Construct a speech signal that will trigger the VAD in all modes. It is
// known that (i * i) will wrap around, but that doesn't matter in this case.
int16_t speech[kMaxFrameLength];
for (int16_t i = 0; i < kMaxFrameLength; i++) {
speech[i] = (i * i);
}
// WebRtcVad_get_version() tests
char version[32];
EXPECT_EQ(-1, WebRtcVad_get_version(NULL, sizeof(version)));
EXPECT_EQ(-1, WebRtcVad_get_version(version, 1));
EXPECT_EQ(0, WebRtcVad_get_version(version, sizeof(version)));
// Null instance tests
EXPECT_EQ(-1, WebRtcVad_Create(NULL));
EXPECT_EQ(-1, WebRtcVad_Init(NULL));
EXPECT_EQ(-1, WebRtcVad_Assign(NULL, NULL));
EXPECT_EQ(-1, WebRtcVad_Free(NULL));
EXPECT_EQ(-1, WebRtcVad_set_mode(NULL, kModes[0]));
EXPECT_EQ(-1, WebRtcVad_Process(NULL, kRates[0], speech, kFrameLengths[0]));
// WebRtcVad_AssignSize tests
int handle_size_bytes = 0;
EXPECT_EQ(0, WebRtcVad_AssignSize(&handle_size_bytes));
EXPECT_EQ(576, handle_size_bytes);
// WebRtcVad_Assign tests
void* tmp_handle = malloc(handle_size_bytes);
EXPECT_EQ(-1, WebRtcVad_Assign(&handle, NULL));
EXPECT_EQ(0, WebRtcVad_Assign(&handle, tmp_handle));
EXPECT_EQ(handle, tmp_handle);
free(tmp_handle);
// WebRtcVad_Create()
ASSERT_EQ(0, WebRtcVad_Create(&handle));
// Not initialized tests
EXPECT_EQ(-1, WebRtcVad_Process(handle, kRates[0], speech, kFrameLengths[0]));
EXPECT_EQ(-1, WebRtcVad_set_mode(handle, kModes[0]));
// WebRtcVad_Init() test
ASSERT_EQ(0, WebRtcVad_Init(handle));
// WebRtcVad_set_mode() invalid modes tests
EXPECT_EQ(-1, WebRtcVad_set_mode(handle, kModes[0] - 1));
EXPECT_EQ(-1, WebRtcVad_set_mode(handle, kModes[kModesSize - 1] + 1));
// WebRtcVad_Process() tests
// NULL speech pointer
EXPECT_EQ(-1, WebRtcVad_Process(handle, kRates[0], NULL, kFrameLengths[0]));
// Invalid sampling rate
EXPECT_EQ(-1, WebRtcVad_Process(handle, 9999, speech, kFrameLengths[0]));
// All zeros as input should work
EXPECT_EQ(0, WebRtcVad_Process(handle, kRates[0], zeros, kFrameLengths[0]));
for (size_t k = 0; k < kModesSize; k++) {
// Test valid modes
EXPECT_EQ(0, WebRtcVad_set_mode(handle, kModes[k]));
// Loop through sampling rate and frame length combinations
for (size_t i = 0; i < kRatesSize; i++) {
for (size_t j = 0; j < kFrameLengthsSize; j++) {
if (ValidRatesAndFrameLengths(kRates[i], kFrameLengths[j])) {
EXPECT_EQ(1, WebRtcVad_Process(handle,
kRates[i],
speech,
kFrameLengths[j]));
} else {
EXPECT_EQ(-1, WebRtcVad_Process(handle,
kRates[i],
speech,
kFrameLengths[j]));
}
}
}
}
EXPECT_EQ(0, WebRtcVad_Free(handle));
}
TEST_F(VadTest, GMMTests) {
int16_t delta = 0;
// Input value at mean.
EXPECT_EQ(1048576, WebRtcVad_GaussianProbability(0, 0, 128, &delta));
EXPECT_EQ(0, delta);
EXPECT_EQ(1048576, WebRtcVad_GaussianProbability(16, 128, 128, &delta));
EXPECT_EQ(0, delta);
EXPECT_EQ(1048576, WebRtcVad_GaussianProbability(-16, -128, 128, &delta));
EXPECT_EQ(0, delta);
// Largest possible input to give non-zero probability.
EXPECT_EQ(1024, WebRtcVad_GaussianProbability(59, 0, 128, &delta));
EXPECT_EQ(7552, delta);
EXPECT_EQ(1024, WebRtcVad_GaussianProbability(75, 128, 128, &delta));
EXPECT_EQ(7552, delta);
EXPECT_EQ(1024, WebRtcVad_GaussianProbability(-75, -128, 128, &delta));
EXPECT_EQ(-7552, delta);
// Too large input, should give zero probability.
EXPECT_EQ(0, WebRtcVad_GaussianProbability(105, 0, 128, &delta));
EXPECT_EQ(13440, delta);
}
TEST_F(VadTest, SPTests) {
VadInstT* handle = (VadInstT*) malloc(sizeof(VadInstT));
int16_t zeros[kMaxFrameLength] = { 0 };
int32_t state[2] = { 0 };
int16_t data_in[kMaxFrameLength];
int16_t data_out[kMaxFrameLength];
const int16_t kReferenceMin[32] = {
1600, 720, 509, 512, 532, 552, 570, 588,
606, 624, 642, 659, 675, 691, 707, 723,
1600, 544, 502, 522, 542, 561, 579, 597,
615, 633, 651, 667, 683, 699, 715, 731
};
// Construct a speech signal that will trigger the VAD in all modes. It is
// known that (i * i) will wrap around, but that doesn't matter in this case.
for (int16_t i = 0; i < kMaxFrameLength; ++i) {
data_in[i] = (i * i);
}
// Input values all zeros, expect all zeros out.
WebRtcVad_Downsampling(zeros, data_out, state, (int) kMaxFrameLength);
EXPECT_EQ(0, state[0]);
EXPECT_EQ(0, state[1]);
for (int16_t i = 0; i < kMaxFrameLength / 2; ++i) {
EXPECT_EQ(0, data_out[i]);
}
// Make a simple non-zero data test.
WebRtcVad_Downsampling(data_in, data_out, state, (int) kMaxFrameLength);
EXPECT_EQ(207, state[0]);
EXPECT_EQ(2270, state[1]);
ASSERT_EQ(0, WebRtcVad_InitCore(handle, 0));
for (int16_t i = 0; i < 16; ++i) {
int16_t value = 500 * (i + 1);
for (int j = 0; j < NUM_CHANNELS; ++j) {
// Use values both above and below initialized value.
EXPECT_EQ(kReferenceMin[i], WebRtcVad_FindMinimum(handle, value, j));
EXPECT_EQ(kReferenceMin[i + 16], WebRtcVad_FindMinimum(handle, 12000, j));
}
handle->frame_counter++;
}
free(handle);
}
// TODO(bjornv): Add a process test, run on file.
} // namespace
} // namespace webrtc