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sdl.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-13-0/backends/platform/sdl/sdl.cpp $
 * $Id: sdl.cpp 38226 2009-02-15 11:21:31Z vinterstum $
 *
 */

#if defined(WIN32)
#include <windows.h>
// winnt.h defines ARRAYSIZE, but we want our own one... - this is needed before including util.h
#undef ARRAYSIZE
#endif

#include "backends/platform/sdl/sdl.h"
#include "common/archive.h"
#include "common/config-manager.h"
#include "common/events.h"
#include "common/util.h"

#ifdef UNIX
  #include "backends/saves/posix/posix-saves.h"
#else
  #include "backends/saves/default/default-saves.h"
#endif
#include "backends/timer/default/default-timer.h"
#include "sound/mixer_intern.h"

#include "icons/scummvm.xpm"

#include <time.h> // for getTimeAndDate()

//#define SAMPLES_PER_SEC 11025
#define SAMPLES_PER_SEC 22050
//#define SAMPLES_PER_SEC 44100


/*
 * Include header files needed for the getFilesystemFactory() method.
 */
#if defined(__amigaos4__)
      #include "backends/fs/amigaos4/amigaos4-fs-factory.h"
#elif defined(UNIX)
      #include "backends/fs/posix/posix-fs-factory.h"
#elif defined(WIN32)
      #include "backends/fs/windows/windows-fs-factory.h"
#endif


#if defined(UNIX)
#ifdef MACOSX
#define DEFAULT_CONFIG_FILE "Library/Preferences/ScummVM Preferences"
#else
#define DEFAULT_CONFIG_FILE ".scummvmrc"
#endif
#else
#define DEFAULT_CONFIG_FILE "scummvm.ini"
#endif

#if defined(MACOSX) || defined(IPHONE)
#include "CoreFoundation/CoreFoundation.h"
#endif


static Uint32 timer_handler(Uint32 interval, void *param) {
      ((DefaultTimerManager *)param)->handler();
      return interval;
}

void OSystem_SDL::initBackend() {
      assert(!_inited);

      int joystick_num = ConfMan.getInt("joystick_num");
      uint32 sdlFlags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;

      if (ConfMan.hasKey("disable_sdl_parachute"))
            sdlFlags |= SDL_INIT_NOPARACHUTE;

#ifdef _WIN32_WCE
      if (ConfMan.hasKey("use_GDI") && ConfMan.getBool("use_GDI")) {
            SDL_VideoInit("windib", 0);
            sdlFlags ^= SDL_INIT_VIDEO;
      }
#endif

      if (joystick_num > -1)
            sdlFlags |= SDL_INIT_JOYSTICK;

      if (SDL_Init(sdlFlags) == -1) {
            error("Could not initialize SDL: %s", SDL_GetError());
      }

      _graphicsMutex = createMutex();

      SDL_ShowCursor(SDL_DISABLE);

      // Enable unicode support if possible
      SDL_EnableUNICODE(1);

      memset(&_oldVideoMode, 0, sizeof(_oldVideoMode));
      memset(&_videoMode, 0, sizeof(_videoMode));
      memset(&_transactionDetails, 0, sizeof(_transactionDetails));

      _cksumValid = false;
#if !defined(_WIN32_WCE) && !defined(__SYMBIAN32__) && !defined(DISABLE_SCALERS)
      _videoMode.mode = GFX_DOUBLESIZE;
      _videoMode.scaleFactor = 2;
      _videoMode.aspectRatio = ConfMan.getBool("aspect_ratio");
      _scalerProc = Normal2x;
#else // for small screen platforms
      _videoMode.mode = GFX_NORMAL;
      _videoMode.scaleFactor = 1;
      _videoMode.aspectRatio = false;
      _scalerProc = Normal1x;
#endif
      _scalerType = 0;
      _modeFlags = 0;

#if !defined(_WIN32_WCE) && !defined(__SYMBIAN32__)
      _videoMode.fullscreen = ConfMan.getBool("fullscreen");
#else
      _videoMode.fullscreen = true;
#endif

#if !defined(MACOSX) && !defined(__SYMBIAN32__)
      // Setup a custom program icon.
      // Don't set icon on OS X, as we use a nicer external icon there.
      // Don't for Symbian: it uses the EScummVM.aif file for the icon.
      setupIcon();
#endif

      // enable joystick
      if (joystick_num > -1 && SDL_NumJoysticks() > 0) {
            printf("Using joystick: %s\n", SDL_JoystickName(0));
            _joystick = SDL_JoystickOpen(joystick_num);
      }


      // Create the savefile manager, if none exists yet (we check for this to
      // allow subclasses to provide their own).
      if (_savefile == 0) {
#ifdef UNIX
      _savefile = new POSIXSaveFileManager();
#else
      _savefile = new DefaultSaveFileManager();
#endif
      }

      // Create and hook up the mixer, if none exists yet (we check for this to
      // allow subclasses to provide their own).
      if (_mixer == 0) {
            setupMixer();
      }

      // Setup the keymapper with backend's set of keys
      // NOTE: must be done before creating TimerManager 
      // to avoid race conditions in creating EventManager
      setupKeymapper();

      // Create and hook up the timer manager, if none exists yet (we check for
      // this to allow subclasses to provide their own).
      if (_timer == 0) {
            // Note: We could implement a custom SDLTimerManager by using
            // SDL_AddTimer. That might yield better timer resolution, but it would
            // also change the semantics of a timer: Right now, ScummVM timers
            // *never* run in parallel, due to the way they are implemented. If we
            // switched to SDL_AddTimer, each timer might run in a separate thread.
            // However, not all our code is prepared for that, so we can't just
            // switch. Still, it's a potential future change to keep in mind.
            _timer = new DefaultTimerManager();
            _timerID = SDL_AddTimer(10, &timer_handler, _timer);
      }

      // Invoke parent implementation of this method
      OSystem::initBackend();

      _inited = true;
}

OSystem_SDL::OSystem_SDL()
      :
#ifdef USE_OSD
      _osdSurface(0), _osdAlpha(SDL_ALPHA_TRANSPARENT), _osdFadeStartTime(0),
#endif
      _hwscreen(0), _screen(0), _tmpscreen(0),
      _overlayVisible(false),
      _overlayscreen(0), _tmpscreen2(0),
      _samplesPerSec(0),
      _cdrom(0), _scalerProc(0), _modeChanged(false), _screenChangeCount(0), _dirtyChecksums(0),
      _mouseVisible(false), _mouseDrawn(false), _mouseData(0), _mouseSurface(0),
      _mouseOrigSurface(0), _cursorTargetScale(1), _cursorPaletteDisabled(true),
      _joystick(0),
      _currentShakePos(0), _newShakePos(0),
      _paletteDirtyStart(0), _paletteDirtyEnd(0),
#ifdef MIXER_DOUBLE_BUFFERING
      _soundMutex(0), _soundCond(0), _soundThread(0),
      _soundThreadIsRunning(false), _soundThreadShouldQuit(false),
#endif
      _fsFactory(0),
      _savefile(0),
      _mixer(0),
      _timer(0),
      _screenIsLocked(false),
      _graphicsMutex(0), _transactionMode(kTransactionNone) {

      // allocate palette storage
      _currentPalette = (SDL_Color *)calloc(sizeof(SDL_Color), 256);
      _cursorPalette = (SDL_Color *)calloc(sizeof(SDL_Color), 256);

      _mouseBackup.x = _mouseBackup.y = _mouseBackup.w = _mouseBackup.h = 0;

      // reset mouse state
      memset(&_km, 0, sizeof(_km));
      memset(&_mouseCurState, 0, sizeof(_mouseCurState));

      _inited = false;


      #if defined(__amigaos4__)
            _fsFactory = new AmigaOSFilesystemFactory();
      #elif defined(UNIX)
            _fsFactory = new POSIXFilesystemFactory();
      #elif defined(WIN32)
            _fsFactory = new WindowsFilesystemFactory();
      #elif defined(__SYMBIAN32__)
            // Do nothing since its handled by the Symbian SDL inheritance
      #else
            #error Unknown and unsupported FS backend
      #endif
}

OSystem_SDL::~OSystem_SDL() {
      SDL_RemoveTimer(_timerID);
      closeMixer();

      free(_dirtyChecksums);
      free(_currentPalette);
      free(_cursorPalette);
      free(_mouseData);

      delete _savefile;
      delete _timer;
}

uint32 OSystem_SDL::getMillis() {
      uint32 millis = SDL_GetTicks();
      getEventManager()->processMillis(millis);
      return millis;
}

void OSystem_SDL::delayMillis(uint msecs) {
      SDL_Delay(msecs);
}

void OSystem_SDL::getTimeAndDate(struct tm &t) const {
      time_t curTime = time(0);
      t = *localtime(&curTime);
}

Common::TimerManager *OSystem_SDL::getTimerManager() {
      assert(_timer);
      return _timer;
}

Common::SaveFileManager *OSystem_SDL::getSavefileManager() {
      assert(_savefile);
      return _savefile;
}

FilesystemFactory *OSystem_SDL::getFilesystemFactory() {
      assert(_fsFactory);
      return _fsFactory;
}

void OSystem_SDL::addSysArchivesToSearchSet(Common::SearchSet &s, int priority) {

#ifdef DATA_PATH
      // Add the global DATA_PATH to the directory search list
      // FIXME: We use depth = 4 for now, to match the old code. May want to change that
      Common::FSNode dataNode(DATA_PATH);
      if (dataNode.exists() && dataNode.isDirectory()) {
            s.add(DATA_PATH, new Common::FSDirectory(dataNode, 4), priority);
      }
#endif

#ifdef MACOSX
      // Get URL of the Resource directory of the .app bundle
      CFURLRef fileUrl = CFBundleCopyResourcesDirectoryURL(CFBundleGetMainBundle());
      if (fileUrl) {
            // Try to convert the URL to an absolute path
            UInt8 buf[MAXPATHLEN];
            if (CFURLGetFileSystemRepresentation(fileUrl, true, buf, sizeof(buf))) {
                  // Success: Add it to the search path
                  Common::String bundlePath((const char *)buf);
                  s.add("__OSX_BUNDLE__", new Common::FSDirectory(bundlePath), priority);
            }
            CFRelease(fileUrl);
      }

#endif

}


static Common::String getDefaultConfigFileName() {
      char configFile[MAXPATHLEN];
#if defined (WIN32) && !defined(_WIN32_WCE) && !defined(__SYMBIAN32__)
      OSVERSIONINFO win32OsVersion;
      ZeroMemory(&win32OsVersion, sizeof(OSVERSIONINFO));
      win32OsVersion.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
      GetVersionEx(&win32OsVersion);
      // Check for non-9X version of Windows.
      if (win32OsVersion.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS) {
            // Use the Application Data directory of the user profile.
            if (win32OsVersion.dwMajorVersion >= 5) {
                  if (!GetEnvironmentVariable("APPDATA", configFile, sizeof(configFile)))
                        error("Unable to access application data directory");
            } else {
                  if (!GetEnvironmentVariable("USERPROFILE", configFile, sizeof(configFile)))
                        error("Unable to access user profile directory");

                  strcat(configFile, "\\Application Data");
                  CreateDirectory(configFile, NULL);
            }

            strcat(configFile, "\\ScummVM");
            CreateDirectory(configFile, NULL);
            strcat(configFile, "\\" DEFAULT_CONFIG_FILE);

            FILE *tmp = NULL;
            if ((tmp = fopen(configFile, "r")) == NULL) {
                  // Check windows directory
                  char oldConfigFile[MAXPATHLEN];
                  GetWindowsDirectory(oldConfigFile, MAXPATHLEN);
                  strcat(oldConfigFile, "\\" DEFAULT_CONFIG_FILE);
                  if ((tmp = fopen(oldConfigFile, "r"))) {
                        strcpy(configFile, oldConfigFile);

                        fclose(tmp);
                  }
            } else {
                  fclose(tmp);
            }
      } else {
            // Check windows directory
            GetWindowsDirectory(configFile, MAXPATHLEN);
            strcat(configFile, "\\" DEFAULT_CONFIG_FILE);
      }
#elif defined(UNIX)
      // On UNIX type systems, by default we store the config file inside
      // to the HOME directory of the user.
      //
      // GP2X is Linux based but Home dir can be read only so do not use
      // it and put the config in the executable dir.
      //
      // On the iPhone, the home dir of the user when you launch the app
      // from the Springboard, is /. Which we don't want.
      const char *home = getenv("HOME");
      if (home != NULL && strlen(home) < MAXPATHLEN)
            snprintf(configFile, MAXPATHLEN, "%s/%s", home, DEFAULT_CONFIG_FILE);
      else
            strcpy(configFile, DEFAULT_CONFIG_FILE);
#else
      strcpy(configFile, DEFAULT_CONFIG_FILE);
#endif

      return configFile;
}

Common::SeekableReadStream *OSystem_SDL::openConfigFileForReading() {
      Common::FSNode file(getDefaultConfigFileName());
      return file.openForReading();
}

Common::WriteStream *OSystem_SDL::openConfigFileForWriting() {
      Common::FSNode file(getDefaultConfigFileName());
      return file.openForWriting();
}

void OSystem_SDL::setWindowCaption(const char *caption) {
      SDL_WM_SetCaption(caption, caption);
}

bool OSystem_SDL::hasFeature(Feature f) {
      return
            (f == kFeatureFullscreenMode) ||
            (f == kFeatureAspectRatioCorrection) ||
            (f == kFeatureAutoComputeDirtyRects) ||
            (f == kFeatureCursorHasPalette) ||
            (f == kFeatureIconifyWindow);
}

void OSystem_SDL::setFeatureState(Feature f, bool enable) {
      switch (f) {
      case kFeatureFullscreenMode:
            setFullscreenMode(enable);
            break;
      case kFeatureAspectRatioCorrection:
            setAspectRatioCorrection(enable);
            break;
      case kFeatureAutoComputeDirtyRects:
            if (enable)
                  _modeFlags |= DF_WANT_RECT_OPTIM;
            else
                  _modeFlags &= ~DF_WANT_RECT_OPTIM;
            break;
      case kFeatureIconifyWindow:
            if (enable)
                  SDL_WM_IconifyWindow();
            break;
      default:
            break;
      }
}

bool OSystem_SDL::getFeatureState(Feature f) {
      assert (_transactionMode == kTransactionNone);

      switch (f) {
      case kFeatureFullscreenMode:
            return _videoMode.fullscreen;
      case kFeatureAspectRatioCorrection:
            return _videoMode.aspectRatio;
      case kFeatureAutoComputeDirtyRects:
            return _modeFlags & DF_WANT_RECT_OPTIM;
      default:
            return false;
      }
}

void OSystem_SDL::quit() {
      if (_cdrom) {
            SDL_CDStop(_cdrom);
            SDL_CDClose(_cdrom);
      }
      unloadGFXMode();
      deleteMutex(_graphicsMutex);

      if (_joystick)
            SDL_JoystickClose(_joystick);
      SDL_ShowCursor(SDL_ENABLE);

      SDL_RemoveTimer(_timerID);
      closeMixer();

      free(_dirtyChecksums);
      free(_currentPalette);
      free(_cursorPalette);
      free(_mouseData);

      delete _savefile;
      delete _timer;

      SDL_Quit();

      delete getEventManager();

      exit(0);
}

void OSystem_SDL::setupIcon() {
      int x, y, w, h, ncols, nbytes, i;
      unsigned int rgba[256];
        unsigned int *icon;

      sscanf(scummvm_icon[0], "%d %d %d %d", &w, &h, &ncols, &nbytes);
      if ((w > 512) || (h > 512) || (ncols > 255) || (nbytes > 1)) {
            warning("Could not load the built-in icon (%d %d %d %d)", w, h, ncols, nbytes);
            return;
      }
      icon = (unsigned int*)malloc(w*h*sizeof(unsigned int));
      if (!icon) {
            warning("Could not allocate temp storage for the built-in icon");
            return;
      }

      for (i = 0; i < ncols; i++) {
            unsigned char code;
            char color[32];
            unsigned int col;
            sscanf(scummvm_icon[1 + i], "%c c %s", &code, color);
            if (!strcmp(color, "None"))
                  col = 0x00000000;
            else if (!strcmp(color, "black"))
                  col = 0xFF000000;
            else if (color[0] == '#') {
                  sscanf(color + 1, "%06x", &col);
                  col |= 0xFF000000;
            } else {
                  warning("Could not load the built-in icon (%d %s - %s) ", code, color, scummvm_icon[1 + i]);
                  free(icon);
                  return;
            }

            rgba[code] = col;
      }
      for (y = 0; y < h; y++) {
            const char *line = scummvm_icon[1 + ncols + y];
            for (x = 0; x < w; x++) {
                  icon[x + w * y] = rgba[(int)line[x]];
            }
      }

      SDL_Surface *sdl_surf = SDL_CreateRGBSurfaceFrom(icon, w, h, 32, w * 4, 0xFF0000, 0x00FF00, 0x0000FF, 0xFF000000);
      if (!sdl_surf) {
            warning("SDL_CreateRGBSurfaceFrom(icon) failed");
      }
      SDL_WM_SetIcon(sdl_surf, NULL);
      SDL_FreeSurface(sdl_surf);
      free(icon);
}

OSystem::MutexRef OSystem_SDL::createMutex(void) {
      return (MutexRef) SDL_CreateMutex();
}

void OSystem_SDL::lockMutex(MutexRef mutex) {
      SDL_mutexP((SDL_mutex *) mutex);
}

void OSystem_SDL::unlockMutex(MutexRef mutex) {
      SDL_mutexV((SDL_mutex *) mutex);
}

void OSystem_SDL::deleteMutex(MutexRef mutex) {
      SDL_DestroyMutex((SDL_mutex *) mutex);
}

#pragma mark -
#pragma mark --- Audio ---
#pragma mark -

#ifdef MIXER_DOUBLE_BUFFERING

void OSystem_SDL::mixerProducerThread() {
      byte nextSoundBuffer;

      SDL_LockMutex(_soundMutex);
      while (true) {
            // Wait till we are allowed to produce data
            SDL_CondWait(_soundCond, _soundMutex);

            if (_soundThreadShouldQuit)
                  break;

            // Generate samples and put them into the next buffer
            nextSoundBuffer = _activeSoundBuf ^ 1;
            _mixer->mixCallback(_soundBuffers[nextSoundBuffer], _soundBufSize);

            // Swap buffers
            _activeSoundBuf = nextSoundBuffer;
      }
      SDL_UnlockMutex(_soundMutex);
}

int SDLCALL OSystem_SDL::mixerProducerThreadEntry(void *arg) {
      OSystem_SDL *this_ = (OSystem_SDL *)arg;
      assert(this_);
      this_->mixerProducerThread();
      return 0;
}


void OSystem_SDL::initThreadedMixer(Audio::MixerImpl *mixer, uint bufSize) {
      _soundThreadIsRunning = false;
      _soundThreadShouldQuit = false;

      // Create mutex and condition variable
      _soundMutex = SDL_CreateMutex();
      _soundCond = SDL_CreateCond();

      // Create two sound buffers
      _activeSoundBuf = 0;
      _soundBufSize = bufSize;
      _soundBuffers[0] = (byte *)calloc(1, bufSize);
      _soundBuffers[1] = (byte *)calloc(1, bufSize);

      _soundThreadIsRunning = true;

      // Finally start the thread
      _soundThread = SDL_CreateThread(mixerProducerThreadEntry, this);
}

void OSystem_SDL::deinitThreadedMixer() {
      // Kill thread?? _soundThread

      if (_soundThreadIsRunning) {
            // Signal the producer thread to end, and wait for it to actually finish.
            _soundThreadShouldQuit = true;
            SDL_CondBroadcast(_soundCond);
            SDL_WaitThread(_soundThread, NULL);

            // Kill the mutex & cond variables.
            // Attention: AT this point, the mixer callback must not be running
            // anymore, else we will crash!
            SDL_DestroyMutex(_soundMutex);
            SDL_DestroyCond(_soundCond);

            _soundThreadIsRunning = false;

            free(_soundBuffers[0]);
            free(_soundBuffers[1]);
      }
}


void OSystem_SDL::mixCallback(void *arg, byte *samples, int len) {
      OSystem_SDL *this_ = (OSystem_SDL *)arg;
      assert(this_);
      assert(this_->_mixer);

      assert((int)this_->_soundBufSize == len);

      // Lock mutex, to ensure our data is not overwritten by the producer thread
      SDL_LockMutex(this_->_soundMutex);

      // Copy data from the current sound buffer
      memcpy(samples, this_->_soundBuffers[this_->_activeSoundBuf], len);

      // Unlock mutex and wake up the produced thread
      SDL_UnlockMutex(this_->_soundMutex);
      SDL_CondSignal(this_->_soundCond);
}

#else

void OSystem_SDL::mixCallback(void *sys, byte *samples, int len) {
      OSystem_SDL *this_ = (OSystem_SDL *)sys;
      assert(this_);
      assert(this_->_mixer);

      this_->_mixer->mixCallback(samples, len);
}

#endif

void OSystem_SDL::setupMixer() {
      SDL_AudioSpec desired;
      SDL_AudioSpec obtained;

      // Determine the desired output sampling frequency.
      _samplesPerSec = 0;
      if (ConfMan.hasKey("output_rate"))
            _samplesPerSec = ConfMan.getInt("output_rate");
      if (_samplesPerSec <= 0)
            _samplesPerSec = SAMPLES_PER_SEC;

      // Determine the sample buffer size. We want it to store enough data for
      // about 1/16th of a second. Note that it must be a power of two.
      // So e.g. at 22050 Hz, we request a sample buffer size of 2048.
      int samples = 8192;
      while (16 * samples >= _samplesPerSec) {
            samples >>= 1;
      }

      memset(&desired, 0, sizeof(desired));
      desired.freq = _samplesPerSec;
      desired.format = AUDIO_S16SYS;
      desired.channels = 2;
      desired.samples = (uint16)samples;
      desired.callback = mixCallback;
      desired.userdata = this;

      // Create the mixer instance
      assert(!_mixer);
      _mixer = new Audio::MixerImpl(this);
      assert(_mixer);

      if (SDL_OpenAudio(&desired, &obtained) != 0) {
            warning("Could not open audio device: %s", SDL_GetError());
            _samplesPerSec = 0;
            _mixer->setReady(false);
      } else {
            // Note: This should be the obtained output rate, but it seems that at
            // least on some platforms SDL will lie and claim it did get the rate
            // even if it didn't. Probably only happens for "weird" rates, though.
            _samplesPerSec = obtained.freq;
            debug(1, "Output sample rate: %d Hz", _samplesPerSec);

            // Tell the mixer that we are ready and start the sound processing
            _mixer->setOutputRate(_samplesPerSec);
            _mixer->setReady(true);

#ifdef MIXER_DOUBLE_BUFFERING
            initThreadedMixer(_mixer, obtained.samples * 4);
#endif

            // start the sound system
            SDL_PauseAudio(0);
      }
}

void OSystem_SDL::closeMixer() {
      if (_mixer)
            _mixer->setReady(false);

      SDL_CloseAudio();

      delete _mixer;
      _mixer = 0;

#ifdef MIXER_DOUBLE_BUFFERING
      deinitThreadedMixer();
#endif

}

Audio::Mixer *OSystem_SDL::getMixer() {
      assert(_mixer);
      return _mixer;
}

#pragma mark -
#pragma mark --- CD Audio ---
#pragma mark -

bool OSystem_SDL::openCD(int drive) {
      if (SDL_InitSubSystem(SDL_INIT_CDROM) == -1)
            _cdrom = NULL;
      else {
            _cdrom = SDL_CDOpen(drive);
            // Did it open? Check if _cdrom is NULL
            if (!_cdrom) {
                  warning("Couldn't open drive: %s", SDL_GetError());
            } else {
                  _cdNumLoops = 0;
                  _cdStopTime = 0;
                  _cdEndTime = 0;
            }
      }

      return (_cdrom != NULL);
}

void OSystem_SDL::stopCD() {  /* Stop CD Audio in 1/10th of a second */
      _cdStopTime = SDL_GetTicks() + 100;
      _cdNumLoops = 0;
}

void OSystem_SDL::playCD(int track, int num_loops, int start_frame, int duration) {
      if (!num_loops && !start_frame)
            return;

      if (!_cdrom)
            return;

      if (duration > 0)
            duration += 5;

      _cdTrack = track;
      _cdNumLoops = num_loops;
      _cdStartFrame = start_frame;

      SDL_CDStatus(_cdrom);
      if (start_frame == 0 && duration == 0)
            SDL_CDPlayTracks(_cdrom, track, 0, 1, 0);
      else
            SDL_CDPlayTracks(_cdrom, track, start_frame, 0, duration);
      _cdDuration = duration;
      _cdStopTime = 0;
      _cdEndTime = SDL_GetTicks() + _cdrom->track[track].length * 1000 / CD_FPS;
}

bool OSystem_SDL::pollCD() {
      if (!_cdrom)
            return false;

      return (_cdNumLoops != 0 && (SDL_GetTicks() < _cdEndTime || SDL_CDStatus(_cdrom) != CD_STOPPED));
}

void OSystem_SDL::updateCD() {
      if (!_cdrom)
            return;

      if (_cdStopTime != 0 && SDL_GetTicks() >= _cdStopTime) {
            SDL_CDStop(_cdrom);
            _cdNumLoops = 0;
            _cdStopTime = 0;
            return;
      }

      if (_cdNumLoops == 0 || SDL_GetTicks() < _cdEndTime)
            return;

      if (_cdNumLoops != 1 && SDL_CDStatus(_cdrom) != CD_STOPPED) {
            // Wait another second for it to be done
            _cdEndTime += 1000;
            return;
      }

      if (_cdNumLoops > 0)
            _cdNumLoops--;

      if (_cdNumLoops != 0) {
            if (_cdStartFrame == 0 && _cdDuration == 0)
                  SDL_CDPlayTracks(_cdrom, _cdTrack, 0, 1, 0);
            else
                  SDL_CDPlayTracks(_cdrom, _cdTrack, _cdStartFrame, 0, _cdDuration);
            _cdEndTime = SDL_GetTicks() + _cdrom->track[_cdTrack].length * 1000 / CD_FPS;
      }
}

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