[gmediaserver-devel] Ugly (but working) single day coding TagLib hack

[Jiri Wichern]

Hi guys,

I was thinking about TagLib, mentioned by Harry ten Berge.
I dearly wanted sensible titles in my SMC ezstream and because ID3Lib didn't want to compile at my server i looked into TagLib.
It did give me some problems (primarilly because TagLib is written in C++ and gmediaserver is C) but I do now have working song titles. Why my SMC ezstream only shows the song title and not stuff like the album im still looking into.
One warning for purist coders: THIS CODE IS UGLY AS H*LL. I won't be responsible for your PC catching fire, your brain getting fried and your girlfriend leaving as a result of reading this.

I also tried some configuring stuff. Got detection of TagLib right but i lack the knowledge to correctly modify the 
makefile.in and makefile.am ... so i won't bother you with that stuff...
I used gmediaserver-0.8.2. Affected files so far:

/:
configure
config.h.in

src/:
main.c
gmediaserver.h
metadata.c
makefile.am
makefile.in
(new)taglib_wrapper.h
(new)taglib_wrapper.cpp

$$main.c diff:
71c71
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)
172c172
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)
250c250
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)


$$gmediaserver.h diff:
191c191
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)


$$metadata.c diff:
27a28,30
> #ifdef HAVE_TAGLIB
> #include "taglib_wrapper.h"
> #endif
118c121
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)
553c556
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)
592c595
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)
674c677
< #ifdef HAVE_ID3LIB
---
> #if (defined HAVE_ID3LIB || defined HAVE_TAGLIB)

$$taglib_wrapper.h:
#include <config.h>

#ifdef HAVE_TAGLIB

#ifdef __cplusplus
extern "C"
{
#endif
typedef struct
{
    void **vppFileRef;
} ID3Tag;

typedef enum
{
    ID3FID_TITLE,
    ID3FID_ALBUM,
    ID3FID_LEADARTIST,
    ID3FID_CONTENTTYPE
} ID3FrameID ;

ID3Tag *ID3Tag_New();
void ID3Tag_Delete(ID3Tag *pTag);
void ID3Tag_Clear(ID3Tag *pTag);

void ID3Tag_Link(ID3Tag *pTag, const char *cpPath);
int ID3Tag_NumFrames(ID3Tag *pTag);

char *get_id3_string(ID3Tag *pTag, ID3FrameID frame_id);
#ifdef __cplusplus
}
#endif


#endif

$$taglib_wrapper.cpp:
#include "taglib_wrapper.h"

#ifdef HAVE_TAGLIB
#include <fileref.h>
#include <tag.h>
extern "C"
{
#include "gmediaserver.h"
}

using namespace std;

TagLib::FileRef ***pppFileList = NULL;
unsigned int uiNrOfFiles = 0;

ID3Tag *ID3Tag_New()
{
    say(4, "Creating ID3Tag. ");
    uiNrOfFiles++;
    pppFileList = (TagLib::FileRef***)realloc(pppFileList, uiNrOfFiles * sizeof(TagLib::FileRef**));
    pppFileList[uiNrOfFiles] = new TagLib::FileRef*;
    *pppFileList[uiNrOfFiles] = NULL;

    ID3Tag *pReturnTag = new ID3Tag;
    pReturnTag->vppFileRef = (void**)pppFileList[uiNrOfFiles];
    say(4, "Taglib pointer: %d\n", *(pReturnTag->vppFileRef));
    return pReturnTag;
}

void ID3Tag_Delete(ID3Tag *pTag)
{
    if((pTag == NULL)
    || (pTag->vppFileRef == NULL) )
    return;
    
    say(4, "Deleting ID3Tag. ");
    say(4, "Taglib pointer: %d\n", *(pTag->vppFileRef));

    for(unsigned int uiTemp = 0; uiTemp < uiNrOfFiles; uiTemp++)
    {
    if(*(pTag->vppFileRef) == (void*)pppFileList[uiTemp])
    {
        delete *pppFileList[uiTemp];
        delete pppFileList[uiTemp];
        for(; uiTemp < uiNrOfFiles - 1; uiTemp++)
        {
        pppFileList[uiTemp] = pppFileList[uiTemp + 1];
        }
        uiNrOfFiles--;
        pppFileList = (TagLib::FileRef***)realloc(pppFileList, uiNrOfFiles * sizeof(TagLib::FileRef**));
        break;
    }
    }
    delete pTag;
}

void ID3Tag_Clear(ID3Tag *pTag)
{
    if((pTag == NULL)
    || (pTag->vppFileRef == NULL) )
    return;

    say(4, "Clearing ID3Tag. ");
    say(4, "Taglib pointer: %d\n", *(pTag->vppFileRef));

    delete (TagLib::FileRef*) *(pTag->vppFileRef);
    *(pTag->vppFileRef) = NULL;

}

void ID3Tag_Link(ID3Tag *pTag, const char *cpPath)
{
    if((pTag == NULL)
    || (pTag->vppFileRef == NULL)
    || (cpPath == NULL) )
    return;

    say(4, "Linking ID3Tag. ");
    
    TagLib::FileRef *pFileRef = new TagLib::FileRef(cpPath);

    if(!pFileRef->isNull() && pFileRef->tag())
    {
    *(pTag->vppFileRef)  = pFileRef;
    say(4, "Taglib pointer: %d\n", *(pTag->vppFileRef));
    }
    else
    {
    say(4, "Incorrect file or empty tag.\n");
    delete pFileRef;
    }
}

int ID3Tag_NumFrames(ID3Tag *pTag)
{
    if((pTag == NULL)
    || (pTag->vppFileRef == NULL) )
    return 0;
    
    say(4, "Getting number of ID3Tags. ");
    say(4, "Taglib pointer: %d\n", *(pTag->vppFileRef));

const char *cpString = ((TagLib::FileRef*)*(pTag->vppFileRef))->tag()->title().toCString();
say(4, "check: %s.\n", cpString);
/**/int iReturn = 1;

    say(4, "Returning: %d\n", iReturn);
    return iReturn;
}

char *get_id3_string(ID3Tag *pTag, ID3FrameID frame_id)
{
    const char *cpString = "<ERROR>";

    do
    {
        if((pTag == NULL)
    || (pTag->vppFileRef == NULL) )
        break;

        say(4, "Getting string from ID3Tags");
    say(4, "Taglib pointer: %d", *(pTag->vppFileRef));

        TagLib::Tag *pLTag = ((TagLib::FileRef*)*(pTag->vppFileRef))->tag();

        switch(frame_id)
    {
        case ID3FID_TITLE:
        cpString = pLTag->title().toCString();
        break;
            case ID3FID_ALBUM:
            cpString = pLTag->album().toCString();
        break;
        case ID3FID_LEADARTIST:
        cpString = pLTag->artist().toCString();
        break;
        case ID3FID_CONTENTTYPE:
        cpString = "???";//pLTag->title().toCString();
        break;
    }
    } while(0);
    
    char *cpBuffer = new char[strlen(cpString) + 1];
    strcpy(cpBuffer, cpString);
    
    say(4, "Returning: %s\n", cpBuffer);
    return cpBuffer;
}
#endif