1 files changed, 136 insertions, 0 deletions
diff --git a/samples/SpeechRecognition/test/PreprocessTest.cpp b/samples/SpeechRecognition/test/PreprocessTest.cpp
new file mode 100644
index 0000000000..2b98831fda
--- /dev/null
+++ b/samples/SpeechRecognition/test/PreprocessTest.cpp
@@ -0,0 +1,136 @@
+//
+// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include <catch.hpp>
+#include <limits>
+
+#include "Preprocess.hpp"
+#include "DataStructures.hpp"
+
+void PopulateTestWavVector(std::vector<int16_t>& vec)
+{
+    constexpr int int16max = std::numeric_limits<int16_t>::max();
+    int val = 0;
+    for (size_t i = 0; i < vec.size(); ++i, ++val)
+    {
+
+        /* We want a differential filter response from both - order 1
+         * and 2 => Don't have a linear signal here - we use a signal
+         * using squares for example. Alternate sign flips might work
+         * just as well and will be computationally less work! */
+        int valsq = val * val;
+        if (valsq > int16max)
+        {
+            val = 0;
+            valsq = 0;
+        }
+        vec[i] = valsq;
+    }
+}
+
+TEST_CASE("Preprocessing calculation INT8")
+{
+    /*Test  Constants: */
+    const uint32_t  windowLen             = 512;
+    const uint32_t  windowStride          = 160;
+    const float     quantScale            = 0.1410219967365265;
+    const int       quantOffset           = -11;
+    int             numMfccVectors        = 10;
+    const int       sampFreq              = 16000;
+    const int       frameLenMs            = 32;
+    const int       frameLenSamples       = sampFreq * frameLenMs * 0.001;
+    const int       numMfccFeats          = 13;
+    const int       audioDataToPreProcess = 512 + ((numMfccVectors -1) * windowStride);
+    int             outputBufferSize = numMfccVectors * numMfccFeats * 3;
+
+    /* Test wav memory */
+    std::vector <int16_t> testWav1((windowStride * numMfccVectors) +
+                              (windowLen - windowStride));
+    /* Populate with dummy input */
+    PopulateTestWavVector(testWav1);
+
+    MfccParams mfccParams(sampFreq, 128, 0, 8000, numMfccFeats, frameLenSamples, false, numMfccVectors);
+
+    MFCC mfccInst = MFCC(mfccParams);
+
+    std::vector<float> fullAudioData;
+
+    for(int i = 0; i < 4; ++i)
+    {
+        for (auto f : testWav1)
+        {
+            fullAudioData.emplace_back(static_cast<float>(f) / (1<<15));
+        }
+    }
+
+    Preprocess prep(frameLenSamples, windowStride, mfccInst);
+
+    std::vector<int8_t> outputBuffer(outputBufferSize);
+
+    prep.Invoke(fullAudioData.data(), audioDataToPreProcess, outputBuffer, quantOffset, quantScale);
+
+    int8_t expectedResult[numMfccVectors][numMfccFeats*3] =
+    {
+            /* Feature vec 0 */
+            -32, 4, -9, -8, -10, -10, -11, -11, -11, -11, -12, -11, -11,    /* MFCCs   */
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,    /* Delta 1 */
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,    /* Delta 2 */
+
+            /* Feature vec 1 */
+            -31, 4, -9, -8, -10, -10, -11, -11, -11, -11, -12, -11, -11,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,
+
+            /* Feature vec 2 */
+            -31, 4, -9, -9, -10, -10, -11, -11, -11, -11, -12, -12, -12,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,
+
+            /* Feature vec 3 */
+            -31, 4, -9, -9, -10, -10, -11, -11, -11, -11, -11, -12, -12,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,
+
+            /* Feature vec 4 : this should have valid delta 1 and delta 2 */
+            -31, 4, -9, -9, -10, -10, -11, -11, -11, -11, -11, -12, -12,
+            -38, -29, -9, 1, -2, -7, -8, -8, -12, -16, -14, -5, 5,
+            -68, -50, -13, 5, 0, -9, -9, -8, -13, -20, -19, -3, 15,
+
+            /* Feature vec 5 : this should have valid delta 1 and delta 2 */
+            -31, 4, -9, -8, -10, -10, -11, -11, -11, -11, -11, -12, -12,
+            -62, -45, -11, 5, 0, -8, -9, -8, -12, -19, -17, -3, 13,
+            -27, -22, -13, -9, -11, -12, -12, -11, -11, -13, -13, -10, -6,
+
+            /* Feature vec 6 */
+            -31, 4, -9, -8, -10, -10, -11, -11, -11, -11, -12, -11, -11,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,
+
+            /* Feature vec 7 */
+            -32, 4, -9, -8, -10, -10, -11, -11, -11, -12, -12, -11, -11,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,
+
+            /* Feature vec 8 */
+            -32, 4, -9, -8, -10, -10, -11, -11, -11, -12, -12, -11, -11,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10,
+
+            /* Feature vec 9 */
+            -31, 4, -9, -8, -10, -10, -11, -11, -11, -11, -12, -11, -11,
+            -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -11,
+            -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10
+    };
+
+    /* Check that the elements have been calculated correctly */
+    for (uint32_t j = 0; j < numMfccVectors; ++j)
+    {
+        for (uint32_t i = 0; i < numMfccFeats * 3; ++i)
+        {
+            size_t tensorIdx = (j * numMfccFeats * 3) + i;
+            CHECK(static_cast<int16_t>(outputBuffer.at(tensorIdx) == static_cast<int16_t>(expectedResult[j][i])));
+        }
+    }
+}