cdplayer.c

SDL库 在进行视频显示程序spcaview安装时必须的库文件

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    [e-mail]
*/
#include "SDL_config.h"

#include "CDPlayer.h"
#include "AudioFilePlayer.h"
#include "SDLOSXCAGuard.h"

/* we're exporting these functions into C land for SDL_syscdrom.c */
/*extern "C" {*/

/*///////////////////////////////////////////////////////////////////////////
    Constants
  //////////////////////////////////////////////////////////////////////////*/

#define kAudioCDFilesystemID   (UInt16)(('J' << 8) | 'H') /* 'JH'; this avoids compiler warning */

/* XML PList keys */
#define kRawTOCDataString           "Format 0x02 TOC Data"
#define kSessionsString             "Sessions"
#define kSessionTypeString          "Session Type"
#define kTrackArrayString           "Track Array"
#define kFirstTrackInSessionString      "First Track"
#define kLastTrackInSessionString       "Last Track"
#define kLeadoutBlockString         "Leadout Block"
#define kDataKeyString              "Data"
#define kPointKeyString             "Point"
#define kSessionNumberKeyString         "Session Number"
#define kStartBlockKeyString            "Start Block"   
    
/*///////////////////////////////////////////////////////////////////////////
    Globals
  //////////////////////////////////////////////////////////////////////////*/

#pragma mark -- Globals --

static int             playBackWasInit = 0;
static AudioUnit        theUnit;
static AudioFilePlayer* thePlayer = NULL;
static CDPlayerCompletionProc   completionProc = NULL;
static SDL_mutex       *apiMutex = NULL;
static SDL_sem         *callbackSem;
static SDL_CD*          theCDROM;

/*///////////////////////////////////////////////////////////////////////////
    Prototypes
  //////////////////////////////////////////////////////////////////////////*/

#pragma mark -- Prototypes --

static OSStatus CheckInit ();

static void     FilePlayNotificationHandler (void* inRefCon, OSStatus inStatus);

static int      RunCallBackThread (void* inRefCon);


#pragma mark -- Public Functions --

void     Lock ()
{
    if (!apiMutex) {
        apiMutex = SDL_CreateMutex();
    }
    SDL_mutexP(apiMutex);
}

void     Unlock ()
{
    SDL_mutexV(apiMutex);
}

int DetectAudioCDVolumes(FSVolumeRefNum *volumes, int numVolumes)
{
    int volumeIndex;
    int cdVolumeCount = 0;
    OSStatus result = noErr;
    
    for (volumeIndex = 1; result == noErr || result != nsvErr; volumeIndex++)
    {
        FSVolumeRefNum  actualVolume;
        FSVolumeInfo    volumeInfo;
        
        memset (&volumeInfo, 0, sizeof(volumeInfo));
        
        result = FSGetVolumeInfo (kFSInvalidVolumeRefNum,
                                  volumeIndex,
                                  &actualVolume,
                                  kFSVolInfoFSInfo,
                                  &volumeInfo,
                                  NULL,
                                  NULL); 
         
        if (result == noErr)
        {
            if (volumeInfo.filesystemID == kAudioCDFilesystemID) /* It's an audio CD */
            {
                if (volumes != NULL && cdVolumeCount < numVolumes)
                    volumes[cdVolumeCount] = actualVolume;
            
                cdVolumeCount++;
            }
        }
        else 
        {
            /* I'm commenting this out because it seems to be harmless */
            /*SDL_SetError ("DetectAudioCDVolumes: FSGetVolumeInfo returned %d", result);*/
        }
    }
        
    return cdVolumeCount;
}

int ReadTOCData (FSVolumeRefNum theVolume, SDL_CD *theCD)
{
    HFSUniStr255      dataForkName;
    OSStatus          theErr;
    SInt16            forkRefNum;
    SInt64            forkSize;
    Ptr               forkData = 0;
    ByteCount         actualRead;
    CFDataRef         dataRef = 0;
    CFPropertyListRef propertyListRef = 0;

    FSRefParam      fsRefPB;
    FSRef           tocPlistFSRef;
    
    const char* error = "Unspecified Error";
    
    /* get stuff from .TOC.plist */
    fsRefPB.ioCompletion = NULL;
    fsRefPB.ioNamePtr = "\p.TOC.plist";
    fsRefPB.ioVRefNum = theVolume;
    fsRefPB.ioDirID = 0;
    fsRefPB.newRef = &tocPlistFSRef;
    
    theErr = PBMakeFSRefSync (&fsRefPB);
    if(theErr != noErr) {
        error = "PBMakeFSRefSync";
        goto bail;
    }
    
    /* Load and parse the TOC XML data */

    theErr = FSGetDataForkName (&dataForkName);
    if (theErr != noErr) {
        error = "FSGetDataForkName";
        goto bail;
    }
    
    theErr = FSOpenFork (&tocPlistFSRef, dataForkName.length, dataForkName.unicode, fsRdPerm, &forkRefNum);
    if (theErr != noErr) {
        error = "FSOpenFork";
        goto bail;
    }
    
    theErr = FSGetForkSize (forkRefNum, &forkSize);
    if (theErr != noErr) {
        error = "FSGetForkSize";
        goto bail;
    }
    
    /* Allocate some memory for the XML data */
    forkData = NewPtr (forkSize);
    if(forkData == NULL) {
        error = "NewPtr";
        goto bail;
    }
    
    theErr = FSReadFork (forkRefNum, fsFromStart, 0 /* offset location */, forkSize, forkData, &actualRead);
    if(theErr != noErr) {
        error = "FSReadFork";
        goto bail;
    }
    
    dataRef = CFDataCreate (kCFAllocatorDefault, (UInt8 *)forkData, forkSize);
    if(dataRef == 0) {
        error = "CFDataCreate";
        goto bail;
    }

    propertyListRef = CFPropertyListCreateFromXMLData (kCFAllocatorDefault,
                                                       dataRef,
                                                       kCFPropertyListImmutable,
                                                       NULL);
    if (propertyListRef == NULL) {
        error = "CFPropertyListCreateFromXMLData";
        goto bail;
    }

    /* Now we got the Property List in memory. Parse it. */
    
    /* First, make sure the root item is a CFDictionary. If not, release and bail. */
    if(CFGetTypeID(propertyListRef)== CFDictionaryGetTypeID())
    {
        CFDictionaryRef dictRef = (CFDictionaryRef)propertyListRef;
        
        CFDataRef   theRawTOCDataRef;
        CFArrayRef  theSessionArrayRef;
        CFIndex     numSessions;
        CFIndex     index;
        
        /* This is how we get the Raw TOC Data */
        theRawTOCDataRef = (CFDataRef)CFDictionaryGetValue (dictRef, CFSTR(kRawTOCDataString));
        
        /* Get the session array info. */
        theSessionArrayRef = (CFArrayRef)CFDictionaryGetValue (dictRef, CFSTR(kSessionsString));
        
        /* Find out how many sessions there are. */
        numSessions = CFArrayGetCount (theSessionArrayRef);
        
        /* Initialize the total number of tracks to 0 */
        theCD->numtracks = 0;
        
        /* Iterate over all sessions, collecting the track data */
        for(index = 0; index < numSessions; index++)
        {
            CFDictionaryRef theSessionDict;
            CFNumberRef     leadoutBlock;
            CFArrayRef      trackArray;
            CFIndex         numTracks;
            CFIndex         trackIndex;
            UInt32          value = 0;
            
            theSessionDict      = (CFDictionaryRef) CFArrayGetValueAtIndex (theSessionArrayRef, index);
            leadoutBlock        = (CFNumberRef) CFDictionaryGetValue (theSessionDict, CFSTR(kLeadoutBlockString));
            
            trackArray = (CFArrayRef)CFDictionaryGetValue (theSessionDict, CFSTR(kTrackArrayString));
            
            numTracks = CFArrayGetCount (trackArray);

            for(trackIndex = 0; trackIndex < numTracks; trackIndex++) {
                    
                CFDictionaryRef theTrackDict;
                CFNumberRef     trackNumber;
                CFNumberRef     sessionNumber;
                CFNumberRef     startBlock;
                CFBooleanRef    isDataTrack;
                UInt32          value;
                
                theTrackDict  = (CFDictionaryRef) CFArrayGetValueAtIndex (trackArray, trackIndex);
                
                trackNumber   = (CFNumberRef)  CFDictionaryGetValue (theTrackDict, CFSTR(kPointKeyString));
                sessionNumber = (CFNumberRef)  CFDictionaryGetValue (theTrackDict, CFSTR(kSessionNumberKeyString));
                startBlock    = (CFNumberRef)  CFDictionaryGetValue (theTrackDict, CFSTR(kStartBlockKeyString));
                isDataTrack   = (CFBooleanRef) CFDictionaryGetValue (theTrackDict, CFSTR(kDataKeyString));
                                                        
                /* Fill in the SDL_CD struct */
                int idx = theCD->numtracks++;

                CFNumberGetValue (trackNumber, kCFNumberSInt32Type, &value);
                theCD->track[idx].id = value;
                
                CFNumberGetValue (startBlock, kCFNumberSInt32Type, &value);
                theCD->track[idx].offset = value;

                theCD->track[idx].type = (isDataTrack == kCFBooleanTrue) ? SDL_DATA_TRACK : SDL_AUDIO_TRACK;

                /* Since the track lengths are not stored in .TOC.plist we compute them. */
                if (trackIndex > 0) {
                    theCD->track[idx-1].length = theCD->track[idx].offset - theCD->track[idx-1].offset;
                }
            }
            
            /* Compute the length of the last track */
            CFNumberGetValue (leadoutBlock, kCFNumberSInt32Type, &value);
            
            theCD->track[theCD->numtracks-1].length = 
                value - theCD->track[theCD->numtracks-1].offset;

            /* Set offset to leadout track */
            theCD->track[theCD->numtracks].offset = value;
        }
    
    }

    theErr = 0;
    goto cleanup;
bail:
    SDL_SetError ("ReadTOCData: %s returned %d", error, theErr);
    theErr = -1;
cleanup:

    if (propertyListRef != NULL)
        CFRelease(propertyListRef);
    if (dataRef != NULL)
        CFRelease(dataRef);
    if (forkData != NULL)
        DisposePtr(forkData);
        
    FSCloseFork (forkRefNum);

    return theErr;
}

int ListTrackFiles (FSVolumeRefNum theVolume, FSRef *trackFiles, int numTracks)