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kc3-lang/SDL/test/testautomation_audio.c

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  • Author : Erik Yuzwa
    Date : 2021-02-13 09:49:31
    Hash : 82a96afa
    Message : Update wiki.libsdl.org urls to libsdl-org/SDL/wiki (#4069)

  • test/testautomation_audio.c
  • /**
     * Original code: automated SDL audio test written by Edgar Simo "bobbens"
     * New/updated tests: aschiffler at ferzkopp dot net
     */
    
    /* quiet windows compiler warnings */
    #define _CRT_SECURE_NO_WARNINGS
    
    #include <stdio.h>
    #include <string.h>
    
    #include "SDL.h"
    #include "SDL_test.h"
    
    /* ================= Test Case Implementation ================== */
    
    /* Fixture */
    
    void
    _audioSetUp(void *arg)
    {
        /* Start SDL audio subsystem */
        int ret = SDL_InitSubSystem( SDL_INIT_AUDIO );
            SDLTest_AssertPass("Call to SDL_InitSubSystem(SDL_INIT_AUDIO)");
        SDLTest_AssertCheck(ret==0, "Check result from SDL_InitSubSystem(SDL_INIT_AUDIO)");
        if (ret != 0) {
               SDLTest_LogError("%s", SDL_GetError());
            }
    }
    
    void
    _audioTearDown(void *arg)
    {
        /* Remove a possibly created file from SDL disk writer audio driver; ignore errors */
        remove("sdlaudio.raw");
    
        SDLTest_AssertPass("Cleanup of test files completed");
    }
    
    
    /* Global counter for callback invocation */
    int _audio_testCallbackCounter;
    
    /* Global accumulator for total callback length */
    int _audio_testCallbackLength;
    
    
    /* Test callback function */
    void SDLCALL _audio_testCallback(void *userdata, Uint8 *stream, int len)
    {
       /* track that callback was called */
       _audio_testCallbackCounter++;
       _audio_testCallbackLength += len;
    }
    
    
    /* Test case functions */
    
    /**
     * \brief Stop and restart audio subsystem
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_QuitSubSystem
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_InitSubSystem
     */
    int audio_quitInitAudioSubSystem()
    {
        /* Stop SDL audio subsystem */
        SDL_QuitSubSystem( SDL_INIT_AUDIO );
            SDLTest_AssertPass("Call to SDL_QuitSubSystem(SDL_INIT_AUDIO)");
    
            /* Restart audio again */
            _audioSetUp(NULL);
    
        return TEST_COMPLETED;
    }
    
    /**
     * \brief Start and stop audio directly
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_InitAudio
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_QuitAudio
     */
    int audio_initQuitAudio()
    {
            int result;
        int i, iMax;
        const char* audioDriver;
    
        /* Stop SDL audio subsystem */
        SDL_QuitSubSystem( SDL_INIT_AUDIO );
            SDLTest_AssertPass("Call to SDL_QuitSubSystem(SDL_INIT_AUDIO)");
    
            /* Loop over all available audio drivers */
            iMax = SDL_GetNumAudioDrivers();
            SDLTest_AssertPass("Call to SDL_GetNumAudioDrivers()");
            SDLTest_AssertCheck(iMax > 0, "Validate number of audio drivers; expected: >0 got: %d", iMax);
            for (i = 0; i < iMax; i++) {
                audioDriver = SDL_GetAudioDriver(i);
                SDLTest_AssertPass("Call to SDL_GetAudioDriver(%d)", i);
                SDLTest_AssertCheck(audioDriver != NULL, "Audio driver name is not NULL");
                SDLTest_AssertCheck(audioDriver[0] != '\0', "Audio driver name is not empty; got: %s", audioDriver);
    
                /* Call Init */
                result = SDL_AudioInit(audioDriver);
                SDLTest_AssertPass("Call to SDL_AudioInit('%s')", audioDriver);
                SDLTest_AssertCheck(result == 0, "Validate result value; expected: 0 got: %d", result);
    
                /* Call Quit */
                SDL_AudioQuit();
                SDLTest_AssertPass("Call to SDL_AudioQuit()");
        }
    
        /* NULL driver specification */
        audioDriver = NULL;
    
        /* Call Init */
        result = SDL_AudioInit(audioDriver);
        SDLTest_AssertPass("Call to SDL_AudioInit(NULL)");
        SDLTest_AssertCheck(result == 0, "Validate result value; expected: 0 got: %d", result);
    
        /* Call Quit */
        SDL_AudioQuit();
        SDLTest_AssertPass("Call to SDL_AudioQuit()");
    
            /* Restart audio again */
            _audioSetUp(NULL);
    
        return TEST_COMPLETED;
    }
    
    /**
     * \brief Start, open, close and stop audio
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_InitAudio
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_OpenAudio
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_CloseAudio
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_QuitAudio
     */
    int audio_initOpenCloseQuitAudio()
    {
        int result, expectedResult;
        int i, iMax, j, k;
        const char* audioDriver;
        SDL_AudioSpec desired;
    
        /* Stop SDL audio subsystem */
        SDL_QuitSubSystem( SDL_INIT_AUDIO );
            SDLTest_AssertPass("Call to SDL_QuitSubSystem(SDL_INIT_AUDIO)");
    
            /* Loop over all available audio drivers */
            iMax = SDL_GetNumAudioDrivers();
            SDLTest_AssertPass("Call to SDL_GetNumAudioDrivers()");
            SDLTest_AssertCheck(iMax > 0, "Validate number of audio drivers; expected: >0 got: %d", iMax);
            for (i = 0; i < iMax; i++) {
                audioDriver = SDL_GetAudioDriver(i);
                SDLTest_AssertPass("Call to SDL_GetAudioDriver(%d)", i);
                SDLTest_AssertCheck(audioDriver != NULL, "Audio driver name is not NULL");
                SDLTest_AssertCheck(audioDriver[0] != '\0', "Audio driver name is not empty; got: %s", audioDriver);
    
                /* Change specs */
                for (j = 0; j < 2; j++) {
    
                    /* Call Init */
                    result = SDL_AudioInit(audioDriver);
                    SDLTest_AssertPass("Call to SDL_AudioInit('%s')", audioDriver);
                    SDLTest_AssertCheck(result == 0, "Validate result value; expected: 0 got: %d", result);
    
                    /* Set spec */
                    SDL_memset(&desired, 0, sizeof(desired));
                    switch (j) {
                        case 0:
                        /* Set standard desired spec */
                        desired.freq = 22050;
                        desired.format = AUDIO_S16SYS;
                        desired.channels = 2;
                        desired.samples = 4096;
                        desired.callback = _audio_testCallback;
                        desired.userdata = NULL;
    
                        case 1:
                        /* Set custom desired spec */
                        desired.freq = 48000;
                        desired.format = AUDIO_F32SYS;
                        desired.channels = 2;
                        desired.samples = 2048;
                        desired.callback = _audio_testCallback;
                        desired.userdata = NULL;
                        break;
                }
    
                /* Call Open (maybe multiple times) */
                for (k=0; k <= j; k++) {
                    result = SDL_OpenAudio(&desired, NULL);
                    SDLTest_AssertPass("Call to SDL_OpenAudio(desired_spec_%d, NULL), call %d", j, k+1);
                    expectedResult = (k==0) ? 0 : -1;
                    SDLTest_AssertCheck(result == expectedResult, "Verify return value; expected: %d, got: %d", expectedResult, result);
                }
    
                /* Call Close (maybe multiple times) */
                for (k=0; k <= j; k++) {
                    SDL_CloseAudio();
                    SDLTest_AssertPass("Call to SDL_CloseAudio(), call %d", k+1);
                }
    
                /* Call Quit (maybe multiple times) */
                for (k=0; k <= j; k++) {
                    SDL_AudioQuit();
                    SDLTest_AssertPass("Call to SDL_AudioQuit(), call %d", k+1);
                }
    
            } /* spec loop */
        } /* driver loop */
    
            /* Restart audio again */
            _audioSetUp(NULL);
    
        return TEST_COMPLETED;
    }
    
    /**
     * \brief Pause and unpause audio
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_PauseAudio
     */
    int audio_pauseUnpauseAudio()
    {
        int result;
        int i, iMax, j, k, l;
        int totalDelay;
        int pause_on;
        int originalCounter;
        const char* audioDriver;
        SDL_AudioSpec desired;
    
        /* Stop SDL audio subsystem */
        SDL_QuitSubSystem( SDL_INIT_AUDIO );
            SDLTest_AssertPass("Call to SDL_QuitSubSystem(SDL_INIT_AUDIO)");
    
            /* Loop over all available audio drivers */
            iMax = SDL_GetNumAudioDrivers();
            SDLTest_AssertPass("Call to SDL_GetNumAudioDrivers()");
            SDLTest_AssertCheck(iMax > 0, "Validate number of audio drivers; expected: >0 got: %d", iMax);
            for (i = 0; i < iMax; i++) {
                audioDriver = SDL_GetAudioDriver(i);
                SDLTest_AssertPass("Call to SDL_GetAudioDriver(%d)", i);
                SDLTest_AssertCheck(audioDriver != NULL, "Audio driver name is not NULL");
                SDLTest_AssertCheck(audioDriver[0] != '\0', "Audio driver name is not empty; got: %s", audioDriver);
    
                /* Change specs */
                for (j = 0; j < 2; j++) {
    
                    /* Call Init */
                    result = SDL_AudioInit(audioDriver);
                    SDLTest_AssertPass("Call to SDL_AudioInit('%s')", audioDriver);
                    SDLTest_AssertCheck(result == 0, "Validate result value; expected: 0 got: %d", result);
    
                    /* Set spec */
                    SDL_memset(&desired, 0, sizeof(desired));
                    switch (j) {
                        case 0:
                        /* Set standard desired spec */
                        desired.freq = 22050;
                        desired.format = AUDIO_S16SYS;
                        desired.channels = 2;
                        desired.samples = 4096;
                        desired.callback = _audio_testCallback;
                        desired.userdata = NULL;
    
                        case 1:
                        /* Set custom desired spec */
                        desired.freq = 48000;
                        desired.format = AUDIO_F32SYS;
                        desired.channels = 2;
                        desired.samples = 2048;
                        desired.callback = _audio_testCallback;
                        desired.userdata = NULL;
                        break;
                }
    
                /* Call Open */
                result = SDL_OpenAudio(&desired, NULL);
                SDLTest_AssertPass("Call to SDL_OpenAudio(desired_spec_%d, NULL)", j);
                SDLTest_AssertCheck(result == 0, "Verify return value; expected: 0 got: %d", result);
    
                /* Start and stop audio multiple times */
                for (l=0; l<3; l++) {
                    SDLTest_Log("Pause/Unpause iteration: %d", l+1);
                
                    /* Reset callback counters */
                    _audio_testCallbackCounter = 0;
                    _audio_testCallbackLength = 0;
    
                    /* Un-pause audio to start playing (maybe multiple times) */
                    pause_on = 0;
                    for (k=0; k <= j; k++) {
                        SDL_PauseAudio(pause_on);
                        SDLTest_AssertPass("Call to SDL_PauseAudio(%d), call %d", pause_on, k+1);
                    }
                
                    /* Wait for callback */
                    totalDelay = 0;
                    do {
                        SDL_Delay(10);
                        totalDelay += 10;
                    } 
                    while (_audio_testCallbackCounter == 0 && totalDelay < 1000);
                    SDLTest_AssertCheck(_audio_testCallbackCounter > 0, "Verify callback counter; expected: >0 got: %d", _audio_testCallbackCounter);
                    SDLTest_AssertCheck(_audio_testCallbackLength > 0, "Verify callback length; expected: >0 got: %d", _audio_testCallbackLength);
    
                    /* Pause audio to stop playing (maybe multiple times) */
                    for (k=0; k <= j; k++) {
                        pause_on = (k==0) ? 1 : SDLTest_RandomIntegerInRange(99, 9999);
                        SDL_PauseAudio(pause_on);
                        SDLTest_AssertPass("Call to SDL_PauseAudio(%d), call %d", pause_on, k+1);
                    }
                
                    /* Ensure callback is not called again */
                    originalCounter = _audio_testCallbackCounter;
                    SDL_Delay(totalDelay + 10);
                    SDLTest_AssertCheck(originalCounter == _audio_testCallbackCounter, "Verify callback counter; expected: %d, got: %d", originalCounter, _audio_testCallbackCounter);
                }
    
                /* Call Close */
                SDL_CloseAudio();
                SDLTest_AssertPass("Call to SDL_CloseAudio()");
    
                /* Call Quit */
                SDL_AudioQuit();
                SDLTest_AssertPass("Call to SDL_AudioQuit()");
    
            } /* spec loop */
        } /* driver loop */
    
        /* Restart audio again */
        _audioSetUp(NULL);
    
        return TEST_COMPLETED;
    }
    
    /**
     * \brief Enumerate and name available audio devices (output and capture).
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetNumAudioDevices
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetAudioDeviceName
     */
    int audio_enumerateAndNameAudioDevices()
    {
       int t, tt;
       int i, n, nn;
       const char *name, *nameAgain;
    
       /* Iterate over types: t=0 output device, t=1 input/capture device */
       for (t=0; t<2; t++) {
    
          /* Get number of devices. */
          n = SDL_GetNumAudioDevices(t);
          SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(%i)", t);
          SDLTest_Log("Number of %s devices < 0, reported as %i", (t) ? "capture" : "output", n);
          SDLTest_AssertCheck(n >= 0, "Validate result is >= 0, got: %i", n);
    
          /* Variation of non-zero type */
          if (t==1) {
             tt = t + SDLTest_RandomIntegerInRange(1,10);
             nn = SDL_GetNumAudioDevices(tt);
             SDLTest_AssertCheck(n==nn, "Verify result from SDL_GetNumAudioDevices(%i), expected same number of audio devices %i, got %i", tt, n, nn);
             nn = SDL_GetNumAudioDevices(-tt);
             SDLTest_AssertCheck(n==nn, "Verify result from SDL_GetNumAudioDevices(%i), expected same number of audio devices %i, got %i", -tt, n, nn);
          }
    
          /* List devices. */
          if (n>0) {
             for (i=0; i<n; i++) {
                name = SDL_GetAudioDeviceName(i, t);
                SDLTest_AssertPass("Call to SDL_GetAudioDeviceName(%i, %i)", i, t);
                SDLTest_AssertCheck(name != NULL, "Verify result from SDL_GetAudioDeviceName(%i, %i) is not NULL", i, t);
                if (name != NULL) {
                  SDLTest_AssertCheck(name[0] != '\0', "verify result from SDL_GetAudioDeviceName(%i, %i) is not empty, got: '%s'", i, t, name);
                  if (t==1) {
                      /* Also try non-zero type */
                      tt = t + SDLTest_RandomIntegerInRange(1,10);
                      nameAgain = SDL_GetAudioDeviceName(i, tt);
                      SDLTest_AssertCheck(nameAgain != NULL, "Verify result from SDL_GetAudioDeviceName(%i, %i) is not NULL", i, tt);
                      if (nameAgain != NULL) {
                        SDLTest_AssertCheck(nameAgain[0] != '\0', "Verify result from SDL_GetAudioDeviceName(%i, %i) is not empty, got: '%s'", i, tt, nameAgain);
                        SDLTest_AssertCheck(SDL_strcmp(name, nameAgain)==0,
                          "Verify SDL_GetAudioDeviceName(%i, %i) and SDL_GetAudioDeviceName(%i %i) return the same string",
                          i, t, i, tt);
                      }
                   }
                }
             }
          }
       }
    
       return TEST_COMPLETED;
    }
    
    /**
     * \brief Negative tests around enumeration and naming of audio devices.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetNumAudioDevices
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetAudioDeviceName
     */
    int audio_enumerateAndNameAudioDevicesNegativeTests()
    {
       int t;
       int i, j, no, nc;
       const char *name;
    
       /* Get number of devices. */
       no = SDL_GetNumAudioDevices(0);
       SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(0)");
       nc = SDL_GetNumAudioDevices(1);
       SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(1)");
    
       /* Invalid device index when getting name */
       for (t=0; t<2; t++) {
          /* Negative device index */
          i = SDLTest_RandomIntegerInRange(-10,-1);
          name = SDL_GetAudioDeviceName(i, t);
          SDLTest_AssertPass("Call to SDL_GetAudioDeviceName(%i, %i)", i, t);
          SDLTest_AssertCheck(name == NULL, "Check SDL_GetAudioDeviceName(%i, %i) result NULL, expected NULL, got: %s", i, t, (name == NULL) ? "NULL" : name);
    
          /* Device index past range */
          for (j=0; j<3; j++) {
             i = (t) ? nc+j : no+j;
             name = SDL_GetAudioDeviceName(i, t);
             SDLTest_AssertPass("Call to SDL_GetAudioDeviceName(%i, %i)", i, t);
             SDLTest_AssertCheck(name == NULL, "Check SDL_GetAudioDeviceName(%i, %i) result, expected: NULL, got: %s", i, t, (name == NULL) ? "NULL" : name);
          }
    
          /* Capture index past capture range but within output range */
          if ((no>0) && (no>nc) && (t==1)) {
             i = no-1;
             name = SDL_GetAudioDeviceName(i, t);
             SDLTest_AssertPass("Call to SDL_GetAudioDeviceName(%i, %i)", i, t);
             SDLTest_AssertCheck(name == NULL, "Check SDL_GetAudioDeviceName(%i, %i) result, expected: NULL, got: %s", i, t, (name == NULL) ? "NULL" : name);
          }
       }
    
       return TEST_COMPLETED;
    }
    
    
    /**
     * \brief Checks available audio driver names.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetNumAudioDrivers
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetAudioDriver
     */
    int audio_printAudioDrivers()
    {
       int i, n;
       const char *name;
    
       /* Get number of drivers */
       n = SDL_GetNumAudioDrivers();
       SDLTest_AssertPass("Call to SDL_GetNumAudioDrivers()");
       SDLTest_AssertCheck(n>=0, "Verify number of audio drivers >= 0, got: %i", n);
    
       /* List drivers. */
       if (n>0)
       {
          for (i=0; i<n; i++) {
             name = SDL_GetAudioDriver(i);
             SDLTest_AssertPass("Call to SDL_GetAudioDriver(%i)", i);
             SDLTest_AssertCheck(name != NULL, "Verify returned name is not NULL");
             if (name != NULL) {
                SDLTest_AssertCheck(name[0] != '\0', "Verify returned name is not empty, got: '%s'", name);
             }
          }
       }
    
       return TEST_COMPLETED;
    }
    
    
    /**
     * \brief Checks current audio driver name with initialized audio.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetCurrentAudioDriver
     */
    int audio_printCurrentAudioDriver()
    {
       /* Check current audio driver */
       const char *name = SDL_GetCurrentAudioDriver();
       SDLTest_AssertPass("Call to SDL_GetCurrentAudioDriver()");
       SDLTest_AssertCheck(name != NULL, "Verify returned name is not NULL");
       if (name != NULL) {
          SDLTest_AssertCheck(name[0] != '\0', "Verify returned name is not empty, got: '%s'", name);
       }
    
       return TEST_COMPLETED;
    }
    
    /* Definition of all formats, channels, and frequencies used to test audio conversions */
    const int _numAudioFormats = 18;
    SDL_AudioFormat _audioFormats[] = { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S16SYS, AUDIO_S16, AUDIO_U16LSB,
                    AUDIO_U16MSB, AUDIO_U16SYS, AUDIO_U16, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S32SYS, AUDIO_S32,
                                    AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_F32SYS, AUDIO_F32 };
    char *_audioFormatsVerbose[] = { "AUDIO_S8", "AUDIO_U8", "AUDIO_S16LSB", "AUDIO_S16MSB", "AUDIO_S16SYS", "AUDIO_S16", "AUDIO_U16LSB",
                    "AUDIO_U16MSB", "AUDIO_U16SYS", "AUDIO_U16", "AUDIO_S32LSB", "AUDIO_S32MSB", "AUDIO_S32SYS", "AUDIO_S32",
                                    "AUDIO_F32LSB", "AUDIO_F32MSB", "AUDIO_F32SYS", "AUDIO_F32" };
    const int _numAudioChannels = 4;
    Uint8 _audioChannels[] = { 1, 2, 4, 6 };
    const int _numAudioFrequencies = 4;
    int _audioFrequencies[] = { 11025, 22050, 44100, 48000 };
    
    
    /**
     * \brief Builds various audio conversion structures
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_BuildAudioCVT
     */
    int audio_buildAudioCVT()
    {
      int result;
      SDL_AudioCVT  cvt;
      SDL_AudioSpec spec1;
      SDL_AudioSpec spec2;
      int i, ii, j, jj, k, kk;
    
      /* No conversion needed */
      spec1.format = AUDIO_S16LSB;
      spec1.channels = 2;
      spec1.freq = 22050;
      result = SDL_BuildAudioCVT(&cvt, spec1.format, spec1.channels, spec1.freq,
                                       spec1.format, spec1.channels, spec1.freq);
      SDLTest_AssertPass("Call to SDL_BuildAudioCVT(spec1 ==> spec1)");
      SDLTest_AssertCheck(result == 0, "Verify result value; expected: 0, got: %i", result);
    
      /* Typical conversion */
      spec1.format = AUDIO_S8;
      spec1.channels = 1;
      spec1.freq = 22050;
      spec2.format = AUDIO_S16LSB;
      spec2.channels = 2;
      spec2.freq = 44100;
      result = SDL_BuildAudioCVT(&cvt, spec1.format, spec1.channels, spec1.freq,
                                       spec2.format, spec2.channels, spec2.freq);
      SDLTest_AssertPass("Call to SDL_BuildAudioCVT(spec1 ==> spec2)");
      SDLTest_AssertCheck(result == 1, "Verify result value; expected: 1, got: %i", result);
    
      /* All source conversions with random conversion targets, allow 'null' conversions */
      for (i = 0; i < _numAudioFormats; i++) {
        for (j = 0; j < _numAudioChannels; j++) {
          for (k = 0; k < _numAudioFrequencies; k++) {
            spec1.format = _audioFormats[i];
            spec1.channels = _audioChannels[j];
            spec1.freq = _audioFrequencies[k];
            ii = SDLTest_RandomIntegerInRange(0, _numAudioFormats - 1);
            jj = SDLTest_RandomIntegerInRange(0, _numAudioChannels - 1);
            kk = SDLTest_RandomIntegerInRange(0, _numAudioFrequencies - 1);
            spec2.format = _audioFormats[ii];
            spec2.channels = _audioChannels[jj];
            spec2.freq = _audioFrequencies[kk];
            result = SDL_BuildAudioCVT(&cvt, spec1.format, spec1.channels, spec1.freq,
                                             spec2.format, spec2.channels, spec2.freq);
            SDLTest_AssertPass("Call to SDL_BuildAudioCVT(format[%i]=%s(%i),channels[%i]=%i,freq[%i]=%i ==> format[%i]=%s(%i),channels[%i]=%i,freq[%i]=%i)",
                i, _audioFormatsVerbose[i], spec1.format, j, spec1.channels, k, spec1.freq, ii, _audioFormatsVerbose[ii], spec2.format, jj, spec2.channels, kk, spec2.freq);
            SDLTest_AssertCheck(result == 0 || result == 1, "Verify result value; expected: 0 or 1, got: %i", result);
            if (result<0) {
              SDLTest_LogError("%s", SDL_GetError());
            } else {
              SDLTest_AssertCheck(cvt.len_mult > 0, "Verify that cvt.len_mult value; expected: >0, got: %i", cvt.len_mult);
            }
          }
        }
      }
    
       return TEST_COMPLETED;
    }
    
    /**
     * \brief Checkes calls with invalid input to SDL_BuildAudioCVT
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_BuildAudioCVT
     */
    int audio_buildAudioCVTNegative()
    {
      const char *expectedError = "Parameter 'cvt' is invalid";
      const char *error;
      int result;
      SDL_AudioCVT  cvt;
      SDL_AudioSpec spec1;
      SDL_AudioSpec spec2;
      int i;
      char message[256];
    
      /* Valid format */
      spec1.format = AUDIO_S8;
      spec1.channels = 1;
      spec1.freq = 22050;
      spec2.format = AUDIO_S16LSB;
      spec2.channels = 2;
      spec2.freq = 44100;
    
      SDL_ClearError();
      SDLTest_AssertPass("Call to SDL_ClearError()");
    
      /* NULL input for CVT buffer */
      result = SDL_BuildAudioCVT((SDL_AudioCVT *)NULL, spec1.format, spec1.channels, spec1.freq,
                                                       spec2.format, spec2.channels, spec2.freq);
      SDLTest_AssertPass("Call to SDL_BuildAudioCVT(NULL,...)");
      SDLTest_AssertCheck(result == -1, "Verify result value; expected: -1, got: %i", result);
      error = SDL_GetError();
      SDLTest_AssertPass("Call to SDL_GetError()");
      SDLTest_AssertCheck(error != NULL, "Validate that error message was not NULL");
      if (error != NULL) {
          SDLTest_AssertCheck(SDL_strcmp(error, expectedError) == 0,
              "Validate error message, expected: '%s', got: '%s'", expectedError, error);
      }
    
      /* Invalid conversions */
      for (i = 1; i < 64; i++) {
        /* Valid format to start with */
        spec1.format = AUDIO_S8;
        spec1.channels = 1;
        spec1.freq = 22050;
        spec2.format = AUDIO_S16LSB;
        spec2.channels = 2;
        spec2.freq = 44100;
    
        SDL_ClearError();
        SDLTest_AssertPass("Call to SDL_ClearError()");
    
        /* Set various invalid format inputs */
        SDL_strlcpy(message, "Invalid: ", 256);
        if (i & 1) {
            SDL_strlcat(message, " spec1.format", 256);
            spec1.format = 0;
        }
        if (i & 2) {
            SDL_strlcat(message, " spec1.channels", 256);
            spec1.channels = 0;
        }
        if (i & 4) {
            SDL_strlcat(message, " spec1.freq", 256);
            spec1.freq = 0;
        }
        if (i & 8) {
            SDL_strlcat(message, " spec2.format", 256);
            spec2.format = 0;
        }
        if (i & 16) {
            SDL_strlcat(message, " spec2.channels", 256);
            spec2.channels = 0;
        }
        if (i & 32) {
            SDL_strlcat(message, " spec2.freq", 256);
            spec2.freq = 0;
        }
        SDLTest_Log("%s", message);
        result = SDL_BuildAudioCVT(&cvt, spec1.format, spec1.channels, spec1.freq,
                                       spec2.format, spec2.channels, spec2.freq);
        SDLTest_AssertPass("Call to SDL_BuildAudioCVT(spec1 ==> spec2)");
        SDLTest_AssertCheck(result == -1, "Verify result value; expected: -1, got: %i", result);
        error = SDL_GetError();
        SDLTest_AssertPass("Call to SDL_GetError()");
        SDLTest_AssertCheck(error != NULL && error[0] != '\0', "Validate that error message was not NULL or empty");
      }
    
      SDL_ClearError();
      SDLTest_AssertPass("Call to SDL_ClearError()");
    
      return TEST_COMPLETED;
    }
    
    /**
     * \brief Checks current audio status.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetAudioStatus
     */
    int audio_getAudioStatus()
    {
       SDL_AudioStatus result;
    
       /* Check current audio status */
       result = SDL_GetAudioStatus();
       SDLTest_AssertPass("Call to SDL_GetAudioStatus()");
       SDLTest_AssertCheck(result == SDL_AUDIO_STOPPED || result == SDL_AUDIO_PLAYING || result == SDL_AUDIO_PAUSED,
            "Verify returned value; expected: STOPPED (%i) | PLAYING (%i) | PAUSED (%i), got: %i",
            SDL_AUDIO_STOPPED, SDL_AUDIO_PLAYING, SDL_AUDIO_PAUSED, result);
    
       return TEST_COMPLETED;
    }
    
    
    
    /**
     * \brief Opens, checks current audio status, and closes a device.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_GetAudioStatus
     */
    int audio_openCloseAndGetAudioStatus()
    {
       SDL_AudioStatus result;
       int i;
       int count;
       char *device;
       SDL_AudioDeviceID id;
       SDL_AudioSpec desired, obtained;
    
       /* Get number of devices. */
       count = SDL_GetNumAudioDevices(0);
       SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(0)");
       if (count > 0) {
         for (i = 0; i < count; i++) {
           /* Get device name */
           device = (char *)SDL_GetAudioDeviceName(i, 0);
           SDLTest_AssertPass("SDL_GetAudioDeviceName(%i,0)", i);
           SDLTest_AssertCheck(device != NULL, "Validate device name is not NULL; got: %s", (device != NULL) ? device : "NULL");
           if (device == NULL) return TEST_ABORTED;
    
           /* Set standard desired spec */
           desired.freq=22050;
           desired.format=AUDIO_S16SYS;
           desired.channels=2;
           desired.samples=4096;
           desired.callback=_audio_testCallback;
           desired.userdata=NULL;
    
           /* Open device */
           id = SDL_OpenAudioDevice((const char *)device, 0, &desired, &obtained, SDL_AUDIO_ALLOW_ANY_CHANGE);
           SDLTest_AssertPass("SDL_OpenAudioDevice('%s',...)", device);
           SDLTest_AssertCheck(id > 1, "Validate device ID; expected: >=2, got: %i", id);
           if (id > 1) {
    
             /* Check device audio status */
             result = SDL_GetAudioDeviceStatus(id);
             SDLTest_AssertPass("Call to SDL_GetAudioDeviceStatus()");
             SDLTest_AssertCheck(result == SDL_AUDIO_STOPPED || result == SDL_AUDIO_PLAYING || result == SDL_AUDIO_PAUSED,
                "Verify returned value; expected: STOPPED (%i) | PLAYING (%i) | PAUSED (%i), got: %i",
                SDL_AUDIO_STOPPED, SDL_AUDIO_PLAYING, SDL_AUDIO_PAUSED, result);
    
             /* Close device again */
             SDL_CloseAudioDevice(id);
             SDLTest_AssertPass("Call to SDL_CloseAudioDevice()");
           }
         }
       } else {
         SDLTest_Log("No devices to test with");
       }
    
       return TEST_COMPLETED;
    }
    
    /**
     * \brief Locks and unlocks open audio device.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_LockAudioDevice
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_UnlockAudioDevice
     */
    int audio_lockUnlockOpenAudioDevice()
    {
       int i;
       int count;
       char *device;
       SDL_AudioDeviceID id;
       SDL_AudioSpec desired, obtained;
    
       /* Get number of devices. */
       count = SDL_GetNumAudioDevices(0);
       SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(0)");
       if (count > 0) {
         for (i = 0; i < count; i++) {
           /* Get device name */
           device = (char *)SDL_GetAudioDeviceName(i, 0);
           SDLTest_AssertPass("SDL_GetAudioDeviceName(%i,0)", i);
           SDLTest_AssertCheck(device != NULL, "Validate device name is not NULL; got: %s", (device != NULL) ? device : "NULL");
           if (device == NULL) return TEST_ABORTED;
    
           /* Set standard desired spec */
           desired.freq=22050;
           desired.format=AUDIO_S16SYS;
           desired.channels=2;
           desired.samples=4096;
           desired.callback=_audio_testCallback;
           desired.userdata=NULL;
    
           /* Open device */
           id = SDL_OpenAudioDevice((const char *)device, 0, &desired, &obtained, SDL_AUDIO_ALLOW_ANY_CHANGE);
           SDLTest_AssertPass("SDL_OpenAudioDevice('%s',...)", device);
           SDLTest_AssertCheck(id > 1, "Validate device ID; expected: >=2, got: %i", id);
           if (id > 1) {
             /* Lock to protect callback */
             SDL_LockAudioDevice(id);
             SDLTest_AssertPass("SDL_LockAudioDevice(%i)", id);
    
             /* Simulate callback processing */
             SDL_Delay(10);
             SDLTest_Log("Simulate callback processing - delay");
    
             /* Unlock again */
             SDL_UnlockAudioDevice(id);
             SDLTest_AssertPass("SDL_UnlockAudioDevice(%i)", id);
    
             /* Close device again */
             SDL_CloseAudioDevice(id);
             SDLTest_AssertPass("Call to SDL_CloseAudioDevice()");
           }
         }
       } else {
         SDLTest_Log("No devices to test with");
       }
    
       return TEST_COMPLETED;
    }
    
    
    /**
     * \brief Convert audio using various conversion structures
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_BuildAudioCVT
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_ConvertAudio
     */
    int audio_convertAudio()
    {
      int result;
      SDL_AudioCVT  cvt;
      SDL_AudioSpec spec1;
      SDL_AudioSpec spec2;
      int c;
      char message[128];
      int i, ii, j, jj, k, kk, l, ll;
    
      /* Iterate over bitmask that determines which parameters are modified in the conversion */
      for (c = 1; c < 8; c++) {
        SDL_strlcpy(message, "Changing:", 128);
        if (c & 1) {
          SDL_strlcat(message, " Format", 128);
        }
        if (c & 2) {
          SDL_strlcat(message, " Channels", 128);
        }
        if (c & 4) {
          SDL_strlcat(message, " Frequencies", 128);
        }
        SDLTest_Log("%s", message);
        /* All source conversions with random conversion targets */
        for (i = 0; i < _numAudioFormats; i++) {
          for (j = 0; j < _numAudioChannels; j++) {
            for (k = 0; k < _numAudioFrequencies; k++) {
              spec1.format = _audioFormats[i];
              spec1.channels = _audioChannels[j];
              spec1.freq = _audioFrequencies[k];
    
              /* Ensure we have a different target format */
              do {
                if (c & 1) {
                  ii = SDLTest_RandomIntegerInRange(0, _numAudioFormats - 1);
                } else {
                  ii = 1;
                }
                if (c & 2) {
                  jj = SDLTest_RandomIntegerInRange(0, _numAudioChannels - 1);
                } else {
                  jj= j;
                }
                if (c & 4) {
                  kk = SDLTest_RandomIntegerInRange(0, _numAudioFrequencies - 1);
                } else {
                  kk = k;
                }
              } while ((i == ii) && (j == jj) && (k == kk));
              spec2.format = _audioFormats[ii];
              spec2.channels = _audioChannels[jj];
              spec2.freq = _audioFrequencies[kk];
    
              result = SDL_BuildAudioCVT(&cvt, spec1.format, spec1.channels, spec1.freq,
                                               spec2.format, spec2.channels, spec2.freq);
              SDLTest_AssertPass("Call to SDL_BuildAudioCVT(format[%i]=%s(%i),channels[%i]=%i,freq[%i]=%i ==> format[%i]=%s(%i),channels[%i]=%i,freq[%i]=%i)",
                i, _audioFormatsVerbose[i], spec1.format, j, spec1.channels, k, spec1.freq, ii, _audioFormatsVerbose[ii], spec2.format, jj, spec2.channels, kk, spec2.freq);
              SDLTest_AssertCheck(result == 1, "Verify result value; expected: 1, got: %i", result);
              if (result != 1) {
                SDLTest_LogError("%s", SDL_GetError());
              } else {
                SDLTest_AssertCheck(cvt.len_mult > 0, "Verify that cvt.len_mult value; expected: >0, got: %i", cvt.len_mult);
                if (cvt.len_mult < 1) return TEST_ABORTED;
    
                /* Create some random data to convert */
                l = 64;
                ll = l * cvt.len_mult;
                SDLTest_Log("Creating dummy sample buffer of %i length (%i bytes)", l, ll);
                cvt.len = l;
                cvt.buf = (Uint8 *)SDL_malloc(ll);
                SDLTest_AssertCheck(cvt.buf != NULL, "Check data buffer to convert is not NULL");
                if (cvt.buf == NULL) return TEST_ABORTED;
    
                /* Convert the data */
                result = SDL_ConvertAudio(&cvt);
                SDLTest_AssertPass("Call to SDL_ConvertAudio()");
                SDLTest_AssertCheck(result == 0, "Verify result value; expected: 0; got: %i", result);
                SDLTest_AssertCheck(cvt.buf != NULL, "Verify conversion buffer is not NULL");
                SDLTest_AssertCheck(cvt.len_ratio > 0.0, "Verify conversion length ratio; expected: >0; got: %f", cvt.len_ratio);
    
                /* Free converted buffer */
                SDL_free(cvt.buf);
                cvt.buf = NULL;
              }
            }
          }
        }
      }
    
       return TEST_COMPLETED;
    }
    
    
    /**
     * \brief Opens, checks current connected status, and closes a device.
     *
     * \sa https://github.com/libsdl-org/SDL/wiki/SDL_AudioDeviceConnected
     */
    int audio_openCloseAudioDeviceConnected()
    {
       int result = -1;
       int i;
       int count;
       char *device;
       SDL_AudioDeviceID id;
       SDL_AudioSpec desired, obtained;
    
       /* Get number of devices. */
       count = SDL_GetNumAudioDevices(0);
       SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(0)");
       if (count > 0) {
         for (i = 0; i < count; i++) {
           /* Get device name */
           device = (char *)SDL_GetAudioDeviceName(i, 0);
           SDLTest_AssertPass("SDL_GetAudioDeviceName(%i,0)", i);
           SDLTest_AssertCheck(device != NULL, "Validate device name is not NULL; got: %s", (device != NULL) ? device : "NULL");
           if (device == NULL) return TEST_ABORTED;
    
           /* Set standard desired spec */
           desired.freq=22050;
           desired.format=AUDIO_S16SYS;
           desired.channels=2;
           desired.samples=4096;
           desired.callback=_audio_testCallback;
           desired.userdata=NULL;
    
           /* Open device */
           id = SDL_OpenAudioDevice((const char *)device, 0, &desired, &obtained, SDL_AUDIO_ALLOW_ANY_CHANGE);
           SDLTest_AssertPass("SDL_OpenAudioDevice('%s',...)", device);
           SDLTest_AssertCheck(id > 1, "Validate device ID; expected: >1, got: %i", id);
           if (id > 1) {
    
    /* TODO: enable test code when function is available in SDL2 */
    
    #ifdef AUDIODEVICECONNECTED_DEFINED
             /* Get connected status */
             result = SDL_AudioDeviceConnected(id);
             SDLTest_AssertPass("Call to SDL_AudioDeviceConnected()");
    #endif
             SDLTest_AssertCheck(result == 1, "Verify returned value; expected: 1; got: %i", result);
    
             /* Close device again */
             SDL_CloseAudioDevice(id);
             SDLTest_AssertPass("Call to SDL_CloseAudioDevice()");
           }
         }
       } else {
         SDLTest_Log("No devices to test with");
       }
    
       return TEST_COMPLETED;
    }
    
    
    
    /* ================= Test Case References ================== */
    
    /* Audio test cases */
    static const SDLTest_TestCaseReference audioTest1 =
            { (SDLTest_TestCaseFp)audio_enumerateAndNameAudioDevices, "audio_enumerateAndNameAudioDevices", "Enumerate and name available audio devices (output and capture)", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest2 =
            { (SDLTest_TestCaseFp)audio_enumerateAndNameAudioDevicesNegativeTests, "audio_enumerateAndNameAudioDevicesNegativeTests", "Negative tests around enumeration and naming of audio devices.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest3 =
            { (SDLTest_TestCaseFp)audio_printAudioDrivers, "audio_printAudioDrivers", "Checks available audio driver names.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest4 =
            { (SDLTest_TestCaseFp)audio_printCurrentAudioDriver, "audio_printCurrentAudioDriver", "Checks current audio driver name with initialized audio.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest5 =
            { (SDLTest_TestCaseFp)audio_buildAudioCVT, "audio_buildAudioCVT", "Builds various audio conversion structures.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest6 =
            { (SDLTest_TestCaseFp)audio_buildAudioCVTNegative, "audio_buildAudioCVTNegative", "Checks calls with invalid input to SDL_BuildAudioCVT", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest7 =
            { (SDLTest_TestCaseFp)audio_getAudioStatus, "audio_getAudioStatus", "Checks current audio status.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest8 =
            { (SDLTest_TestCaseFp)audio_openCloseAndGetAudioStatus, "audio_openCloseAndGetAudioStatus", "Opens and closes audio device and get audio status.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest9 =
            { (SDLTest_TestCaseFp)audio_lockUnlockOpenAudioDevice, "audio_lockUnlockOpenAudioDevice", "Locks and unlocks an open audio device.", TEST_ENABLED };
    
    /* TODO: enable test when SDL_ConvertAudio segfaults on cygwin have been fixed.    */
    /* For debugging, test case can be run manually using --filter audio_convertAudio  */
    
    static const SDLTest_TestCaseReference audioTest10 =
            { (SDLTest_TestCaseFp)audio_convertAudio, "audio_convertAudio", "Convert audio using available formats.", TEST_DISABLED };
    
    /* TODO: enable test when SDL_AudioDeviceConnected has been implemented.           */
    
    static const SDLTest_TestCaseReference audioTest11 =
            { (SDLTest_TestCaseFp)audio_openCloseAudioDeviceConnected, "audio_openCloseAudioDeviceConnected", "Opens and closes audio device and get connected status.", TEST_DISABLED };
    
    static const SDLTest_TestCaseReference audioTest12 =
            { (SDLTest_TestCaseFp)audio_quitInitAudioSubSystem, "audio_quitInitAudioSubSystem", "Quit and re-init audio subsystem.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest13 =
            { (SDLTest_TestCaseFp)audio_initQuitAudio, "audio_initQuitAudio", "Init and quit audio drivers directly.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest14 =
            { (SDLTest_TestCaseFp)audio_initOpenCloseQuitAudio, "audio_initOpenCloseQuitAudio", "Cycle through init, open, close and quit with various audio specs.", TEST_ENABLED };
    
    static const SDLTest_TestCaseReference audioTest15 =
            { (SDLTest_TestCaseFp)audio_pauseUnpauseAudio, "audio_pauseUnpauseAudio", "Pause and Unpause audio for various audio specs while testing callback.", TEST_ENABLED };
    
    /* Sequence of Audio test cases */
    static const SDLTest_TestCaseReference *audioTests[] =  {
        &audioTest1, &audioTest2, &audioTest3, &audioTest4, &audioTest5, &audioTest6,
        &audioTest7, &audioTest8, &audioTest9, &audioTest10, &audioTest11,
        &audioTest12, &audioTest13, &audioTest14, &audioTest15, NULL
    };
    
    /* Audio test suite (global) */
    SDLTest_TestSuiteReference audioTestSuite = {
        "Audio",
        _audioSetUp,
        audioTests,
        _audioTearDown
    };