companders_fulltest.c

/**
 *  @file companders_fulltest.c - test file for integer companding C implementation
 *
 *  @copy copyright (c)  <M. A. Chatterjee>
 *  @autor M A Chatterjee <deftio [at] deftio [dot] com>
 *
LICENSE: 

Copyright (c) 2001-2024, M. A. Chatterjee < deftio at deftio dot com >
All rights reserved.

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* Redistributions of source code must retain the above copyright notice, this
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* Redistributions in binary form must reproduce the above copyright notice,
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "companders.h"

//=========================================================
const int cBias = 0x84;
const int cClip = 32635;

static char MuLawCompressTable[256] =
{
     0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
     4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
     5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
     5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};

unsigned char LinearToMuLawSample(short sample)
{
     int sign = (sample >> 8) & 0x80;
     if (sign)
          sample = (short)-sample;
     if (sample > cClip)
          sample = cClip;
     sample = (short)(sample + cBias);
     int exponent = (int)MuLawCompressTable[(sample>>7) & 0xFF];
     int mantissa = (sample >> (exponent+3)) & 0x0F;
     int compressedByte = ~ (sign | (exponent << 4) | mantissa);

     return (unsigned char)compressedByte;
}



//=========================================================

void test_LinearToALaw() {
    DIO_s16 testSamples[] = {-2460, -338, -1, 499, 980, 32700};
    DIO_s8 expectedResults[] = {22, 64, 85, -54, -5, -86};
    size_t numSamples = sizeof(testSamples) / sizeof(testSamples[0]);
    for (size_t i = 0; i < numSamples; ++i) {
        DIO_s8 companded = DIO_LinearToALaw(testSamples[i]);
        printf("Linear to A-Law: %5d -> %5d (expected: %5d)\n", testSamples[i], companded, expectedResults[i]);
        assert(companded == expectedResults[i]);
    }
}

void test_ALawToLinear() {
    DIO_s8 testSamples[] = {22, 64, 85, -54, -5};
    DIO_s16 expectedResults[] = {-2496, -344,-8,504,976};
    size_t numSamples = sizeof(testSamples) / sizeof(testSamples[0]);
    for (size_t i = 0; i < numSamples; ++i) {
        DIO_s16 linear = DIO_ALawToLinear(testSamples[i]);
        printf("A-Law to Linear: %5d -> %5d (expected: %5d)\n", testSamples[i], linear, expectedResults[i]);
        assert(linear == expectedResults[i]);
    }
}

void test_LinearToULaw() {
    DIO_s16 testSamples[]     = {-2460, -338,   -1,  499, 7000,32700};
    DIO_s8  expectedResults[] = { 59, 98, 127, 220, 164, -128};
    size_t numSamples = sizeof(testSamples) / sizeof(testSamples[0]);
    for (size_t i = 0; i < numSamples; ++i) {
        DIO_s8 companded = DIO_LinearToULaw(testSamples[i]);
        DIO_s8 compandedTest = LinearToMuLawSample(testSamples[i]);
        printf("Linear to u-Law: %5d -> %5d (expected: %5d %5d)\n", testSamples[i], companded, compandedTest, expectedResults[i]);
        assert(companded == expectedResults[i]);
    }
}

void test_ULawToLinear() {
    DIO_s8 testSamples[]      = { 0x1c, 0x61, 0, 0xbf, 0x84};
    DIO_s16 expectedResults[] = {-9852,  -356,   -32124,  1980, 28028};
    size_t numSamples = sizeof(testSamples) / sizeof(testSamples[0]);
    for (size_t i = 0; i < numSamples; ++i) {
        DIO_s16 linear = DIO_ULawToLinear(testSamples[i]);
        printf("u-Law to Linear: %5d -> %5d (expected: %5d)\n", testSamples[i],  linear, expectedResults[i]);
        assert(linear == expectedResults[i]);
    }
}

void test_IIRavgFR() {
    DIO_s32 prevAvg = 1000;
    DIO_u16 windowLen = 10;
    DIO_s16 newSample = 2000;
    DIO_u8 radix = 8;
    DIO_s32 expectedAvg = 203; // Replace with actual expected value based on calculation
    DIO_s32 avg = DIO_IIRavgFR(prevAvg, windowLen, newSample, radix) / (1 << radix);
    printf("IIRavgFR: prevAvg=%ld, windowLen=%d, newSample=%d, radix=%d -> avg=%ld\n",
           prevAvg, windowLen, newSample, radix, avg);
    assert(avg == expectedAvg);
}

void test_IIRavgPower2FR() {
    DIO_s32 prevAvg = 1000;
    DIO_u8 windowLenInBits = 4;
    DIO_s16 newSample = 2000;
    DIO_u8 radix = 8;
    DIO_s32 expectedAvg = 128; // Replace with actual expected value based on calculation
    DIO_s32 avg = DIO_IIRavgPower2FR(prevAvg, windowLenInBits, newSample, radix) / (1 << radix);
    printf("IIRavgPower2FR: prevAvg=%ld, windowLenInBits=%d, newSample=%d, radix=%d -> avg=%ld\n",
           prevAvg, windowLenInBits, newSample, radix, avg);
    assert(avg == expectedAvg);
}

int main() {
    printf("Testing LinearToALaw...\n");
    test_LinearToALaw();
    printf("\nTesting ALawToLinear...\n");
    test_ALawToLinear();
    printf("\nTesting LinearToULaw...\n");
    test_LinearToULaw();
    printf("\nTesting ULawToLinear...\n");
    test_ULawToLinear();
    printf("\nTesting IIRavgFR...\n");
    test_IIRavgFR();
    printf("\nTesting IIRavgPower2FR...\n");
    test_IIRavgPower2FR();
    printf("\n\nAll tests passed!\n\n");
    return 0;
}