cdplayer.c

SDL库 在进行视频显示程序spcaview安装时必须的库文件

{
    OSStatus        result = -1;
    FSIterator      iterator;
    ItemCount       actualObjects;
    FSRef           rootDirectory;
    FSRef           ref;
    HFSUniStr255    nameStr;
    
    result = FSGetVolumeInfo (theVolume,
                              0,
                              NULL,
                              kFSVolInfoFSInfo,
                              NULL,
                              NULL,
                              &rootDirectory); 
                                 
    if (result != noErr) {
        SDL_SetError ("ListTrackFiles: FSGetVolumeInfo returned %d", result);
        return result;
    }

    result = FSOpenIterator (&rootDirectory, kFSIterateFlat, &iterator);
    if (result == noErr) {
        do
        {
            result = FSGetCatalogInfoBulk (iterator, 1, &actualObjects,
                                           NULL, kFSCatInfoNone, NULL, &ref, NULL, &nameStr);
            if (result == noErr) {
                
                CFStringRef  name;
                name = CFStringCreateWithCharacters (NULL, nameStr.unicode, nameStr.length);
                
                /* Look for .aiff extension */
                if (CFStringHasSuffix (name, CFSTR(".aiff")) ||
                    CFStringHasSuffix (name, CFSTR(".cdda"))) {
                    
                    /* Extract the track id from the filename */
                    int trackID = 0, i = 0;
                    while (i < nameStr.length && !isdigit(nameStr.unicode[i])) {
                        ++i;
                    }
                    while (i < nameStr.length && isdigit(nameStr.unicode[i])) {
                        trackID = 10 * trackID +(nameStr.unicode[i] - '0');
                        ++i;
                    }

                    #if DEBUG_CDROM
                    printf("Found AIFF for track %d: '%s'\n", trackID, 
                    CFStringGetCStringPtr (name, CFStringGetSystemEncoding()));
                    #endif
                    
                    /* Track ID's start at 1, but we want to start at 0 */
                    trackID--;
                    
                    assert(0 <= trackID && trackID <= SDL_MAX_TRACKS);
                    
                    if (trackID < numTracks)
                        memcpy (&trackFiles[trackID], &ref, sizeof(FSRef));
                }
                CFRelease (name);
            }
        } while(noErr == result);
        FSCloseIterator (iterator);
    }
    
    return 0;
}

int LoadFile (const FSRef *ref, int startFrame, int stopFrame)
{
    int error = -1;
    
    if (CheckInit () < 0)
        goto bail;
    
    /* release any currently playing file */
    if (ReleaseFile () < 0)
        goto bail;
    
    #if DEBUG_CDROM
    printf ("LoadFile: %d %d\n", startFrame, stopFrame);
    #endif
    
    /*try {*/
    
        /* create a new player, and attach to the audio unit */
        
        thePlayer = new_AudioFilePlayer(ref);
        if (thePlayer == NULL) {
            SDL_SetError ("LoadFile: Could not create player");
            return -3; /*throw (-3);*/
        }
            
        if (!thePlayer->SetDestination(thePlayer, &theUnit))
            goto bail;
        
        if (startFrame >= 0)
            thePlayer->SetStartFrame (thePlayer, startFrame);
        
        if (stopFrame >= 0 && stopFrame > startFrame)
            thePlayer->SetStopFrame (thePlayer, stopFrame);
        
        /* we set the notifier later */
        /*thePlayer->SetNotifier(thePlayer, FilePlayNotificationHandler, NULL);*/
            
        if (!thePlayer->Connect(thePlayer))
            goto bail;
    
        #if DEBUG_CDROM
        thePlayer->Print(thePlayer);
        fflush (stdout);
        #endif
    /*}
      catch (...)
      {
          goto bail;
      }*/
        
    error = 0;

    bail:
    return error;
}

int ReleaseFile ()
{
    int error = -1;
        
    /* (Don't see any way that the original C++ code could throw here.) --ryan. */
    /*try {*/
        if (thePlayer != NULL) {
            
            thePlayer->Disconnect(thePlayer);
            
            delete_AudioFilePlayer(thePlayer);
            
            thePlayer = NULL;
        }
    /*}
      catch (...)
      {
          goto bail;
      }*/
    
    error = 0;
    
/*  bail: */
    return error;
}

int PlayFile ()
{
    OSStatus result = -1;
    
    if (CheckInit () < 0)
        goto bail;
        
    /*try {*/
    
        // start processing of the audio unit
        result = AudioOutputUnitStart (theUnit);
            if (result) goto bail; //THROW_RESULT("PlayFile: AudioOutputUnitStart")
        
    /*}
    catch (...)
    {
        goto bail;
    }*/
    
    result = 0;
    
bail:
    return result;
}

int PauseFile ()
{
    OSStatus result = -1;
    
    if (CheckInit () < 0)
        goto bail;
            
    /*try {*/
    
        /* stop processing the audio unit */
        result = AudioOutputUnitStop (theUnit);
            if (result) goto bail;  /*THROW_RESULT("PauseFile: AudioOutputUnitStop")*/
    /*}
      catch (...)
      {
          goto bail;
      }*/
    
    result = 0;
bail:
    return result;
}

void SetCompletionProc (CDPlayerCompletionProc proc, SDL_CD *cdrom)
{
    assert(thePlayer != NULL);

    theCDROM = cdrom;
    completionProc = proc;
    thePlayer->SetNotifier (thePlayer, FilePlayNotificationHandler, cdrom);
}

int GetCurrentFrame ()
{    
    int frame;
    
    if (thePlayer == NULL)
        frame = 0;
    else
        frame = thePlayer->GetCurrentFrame (thePlayer);
        
    return frame; 
}


#pragma mark -- Private Functions --

static OSStatus CheckInit ()
{    
    if (playBackWasInit)
        return 0;
    
    OSStatus result = noErr;
    
    /* Create the callback semaphore */
    callbackSem = SDL_CreateSemaphore(0);

    /* Start callback thread */
    SDL_CreateThread(RunCallBackThread, NULL);

    { /*try {*/
        ComponentDescription desc;
    
        desc.componentType = kAudioUnitComponentType;
        desc.componentSubType = kAudioUnitSubType_Output;
        desc.componentManufacturer = kAudioUnitID_DefaultOutput;
        desc.componentFlags = 0;
        desc.componentFlagsMask = 0;
        
        Component comp = FindNextComponent (NULL, &desc);
        if (comp == NULL) {
            SDL_SetError ("CheckInit: FindNextComponent returned NULL");
            if (result) return -1; //throw(internalComponentErr);
        }
        
        result = OpenAComponent (comp, &theUnit);
            if (result) return -1; //THROW_RESULT("CheckInit: OpenAComponent")
                    
        // you need to initialize the output unit before you set it as a destination
        result = AudioUnitInitialize (theUnit);
            if (result) return -1; //THROW_RESULT("CheckInit: AudioUnitInitialize")
        
                    
        playBackWasInit = true;
    }
    /*catch (...)
      {
          return -1;
      }*/
    
    return 0;
}

static void FilePlayNotificationHandler(void * inRefCon, OSStatus inStatus)
{
    if (inStatus == kAudioFilePlay_FileIsFinished) {
    
        /* notify non-CA thread to perform the callback */
        SDL_SemPost(callbackSem);
        
    } else if (inStatus == kAudioFilePlayErr_FilePlayUnderrun) {
    
        SDL_SetError ("CDPlayer Notification: buffer underrun");
    } else if (inStatus == kAudioFilePlay_PlayerIsUninitialized) {
    
        SDL_SetError ("CDPlayer Notification: player is uninitialized");
    } else {
        
        SDL_SetError ("CDPlayer Notification: unknown error %ld", inStatus);
    }
}

static int RunCallBackThread (void *param)
{
    for (;;) {
    
	SDL_SemWait(callbackSem);

        if (completionProc && theCDROM) {
            #if DEBUG_CDROM
            printf ("callback!\n");
            #endif
            (*completionProc)(theCDROM);
        } else {
            #if DEBUG_CDROM
            printf ("callback?\n");
            #endif
        }
    }
    
    #if DEBUG_CDROM
    printf ("thread dying now...\n");
    #endif
    
    return 0;
}

/*}; // extern "C" */