[mikebzh44]

Hi.

I want to know the hash coded name for a thumbnail.

I have found this in the wiki :

http://wiki.xbmc.org/index.php?title=Thumbnails#Hashing

So I make some tests with Python :

Code:

def get_crc32( string ):
    string = string.lower()
    bytes = bytearray(string.encode())
    crc = 0xffffffff;
    for b in bytes:
        crc = crc ^ (b << 24)
        for i in range(8):
            if (crc & 0x80000000 ):
                crc = (crc << 1) ^ 0x04C11DB7
            else:
                crc = crc << 1;
        crc = crc & 0xFFFFFFFF
    return '%08x' % crc

print ("CRC32=", get_crc32("F:\\Videos\\Nosferatu.avi"))

As espected, hash code is :

Code:

CRC32= 2a6ec78d

But I want to find the thumbnail for this picture : C:\TV\TF1.tbn

So same function in Python :

Code:

print ("CRC32=", get_crc32("C:\\TV\\TF1.tbn"))

And result :

Code:

CRC32= 2a6ec78d

But the correct file in thumbnail folder is XBMC\userdata\Thumbnails\Video\11c05c994.tbn

[Martijn]

There is a xbmc module for getting the hash location.
See the py-docs.

Example:
https://github.com/XBMC-Addons/script.ar...loader#L80

[mikebzh44]

Thanks Martijn.

But I was doing this outside XBMC and as the code is given in the wiki, I want to understand how XBMC get hash name and not use built in function

[Martijn]

Ah ok
Possibly some one can point you to the source code in XBMC

[spiff]

this has been all changed in master. however;

see CFileItem::GetCachedXXXThumb() for the code in eden (FileItem.cpp)

[mikebzh44]

Thanks Spiff but I don't find the function that give 11c05c994 for the filename C:\TV\TF1.tbn

In FileItem.cpp

Code:

CStdString CFileItem::GetCachedArtistThumb() const
{
  return CThumbnailCache::GetArtistThumb(*this);
}

In ThumbnailCache.cpp

Code:

CStdString CThumbnailCache::GetArtistThumb(const CFileItem &item)
{
  return GetArtistThumb(item.GetLabel());
}

[jmarshall]

It doesn't give it for a .tbn file. It gives it for the media file. i.e. crc the media file and that's the thumb to use.

[mikebzh44]

OK but I want to write a Pyhton function that give the hash codec name for a fullpath file.

Exactly the same that in the wiki :

http://wiki.xbmc.org/index.php?title=Thumbnails#Hashing

But, as spiff said, the function given is deprecated.

So where can I found in the cpp files, the function that give 11c05c994 (and store thumbnail in XBMC\userdata\Thumbnails\Video\11c05c994.tbn) for the filename C:\TV\TF1.tbn ?

Thanks.

[jmarshall]

Again, that is not the filename that produced said thumb. TF1.avi if a video file or C:\TV\TF1\ if a folder would have been used.

The cpp file is the one you quote above (ThumbnailCache.cpp) - you'll need an older version, eg look in the Eden branch on github.

https://github.com/xbmc/xbmc/blob/Eden/x...lCache.cpp

Cheers,
Jonathan

[mikebzh44]

Sorry but I don't undersand

What I do :

- Make a directory C:\TV
- Add a M3U file : C:\TV\TF1.m3u
- Add a TBN file : C:\TV\TF1.tbn to specify the thumbnail to XBMC
- Add C:\TV to XBMC source with no scrapper
- In XBMC, first time I access this sourcce, XBMC copy C:\TV\TF1.tbn to XBMC\userdata\Thumbnails\Video\11c05c994.tbn
- If I want to update my TF1.tbn thumbnail, I overwrite C:\TV\TF1.tbn but XBMC don't use it and still display 11c05c994.tbn
- So I have to manually copy my new TF1.tbn to XBMC\userdata\Thumbnails\Video\11c05c994.tbn

But when you have a lot a files in Thumbnails directories, it's hard to know how the searched thumbnail is named.

So I was thinking of a small python code that give me 11c05c994 when I pass C:\TV\TF1.tbn or TF1.tbn (don't know if thumbnail name is based on filename (with or withour extension) or fullpath filename.

Hope that is clearer for you guys

Thanks.

[jmarshall]

You pass it C:\TV\TF1.m3u

[mikebzh44]

Get it and it's so logical !!!

So with this code :

Code:

def get_crc32( string ):
    string = string.lower()
    bytes = bytearray(string.encode())
    crc = 0xffffffff;
    for b in bytes:
        crc = crc ^ (b << 24)
        for i in range(8):
            if (crc & 0x80000000 ):
                crc = (crc << 1) ^ 0x04C11DB7
            else:
                crc = crc << 1;
        crc = crc & 0xFFFFFFFF
    return '%08x' % crc

print ("CRC32=", get_crc32("C:\\TV\\TF1.m3u"))

Get the correct result :

Code:

CRC32= 1c05c994

But the thumbnail get a one more 1 at first position :

XBMC\userdata\Thumbnails\Video\11c05c994.tbn

[jmarshall]

The first character is re-used as the subfolder.

[mikebzh44]

OK.

Guess that I haven't subdirectory because I was using a fresh XBMC setup with only 1 file (TF1.m3u) so no subfolder was created

Thanks a lot for your answers.