Detecting bpm with Bass.dll

[davecollinsnz]

What I am trying to do is get the bpm from a song that is playing on the computer using bass.dll from http://www.un4seen.com/.

This is my code

While 1
$bpmdata=DllCall("bass.dll","Long", "BASS_ChannelGetAttribute","DWORD","HMUSIC","DWORD","BASS_ATTRIB_MUSIC_BPM","float","                  ")

msgbox(0,"$bpmdata",$bpmdata)
msgbox(0,"$bpmdata[0]",$bpmdata[0])
msgbox(0,"$bpmdata[1]",$bpmdata[1])
msgbox(0,"$bpmdata[2]",$bpmdata[2])


Wend

And here is a page from the bass help file.

BASS_ChannelGetAttribute

--------------------------------------------------------------------------------

Retrieves the value of a channel's attribute.

BOOL BASS_ChannelGetAttribute(

DWORD handle,

DWORD attrib,

float *value

);

Parameters

handle The channel handle... a HCHANNEL, HMUSIC, HSTREAM, or HRECORD.

attrib The attribute to set the value of... one of the following.

BASS_ATTRIB_EAXMIX EAX wet/dry mix. (HCHANNEL/HMUSIC/HSTREAM only)

BASS_ATTRIB_FREQ Sample rate.

BASS_ATTRIB_MUSIC_AMPLIFY Amplification level. (HMUSIC)

BASS_ATTRIB_MUSIC_BPM BPM. (HMUSIC)

BASS_ATTRIB_MUSIC_PANSEP Pan separation level. (HMUSIC)

BASS_ATTRIB_MUSIC_PSCALER Position scaler. (HMUSIC)

BASS_ATTRIB_MUSIC_SPEED Speed. (HMUSIC)

BASS_ATTRIB_MUSIC_VOL_CHAN A channel volume level. (HMUSIC)

BASS_ATTRIB_MUSIC_VOL_GLOBAL Global volume level. (HMUSIC)

BASS_ATTRIB_MUSIC_VOL_INST An instrument/sample volume level. (HMUSIC)

BASS_ATTRIB_PAN Panning/balance position.

BASS_ATTRIB_VOL Volume level.

other attributes may be supported by add-ons, see the documentation.

value Pointer to a variable to receive the attribute value.

Return value

If successful, then TRUE is returned, else FALSE is returned. Use BASS_ErrorGetCode to get the error code.

Error codes

BASS_ERROR_HANDLE handle is not a valid channel.

BASS_ERROR_ILLTYPE attrib is not valid.

some attributes may have additional error codes, see the documentation.

I have been searching through the forums for several days and I need someone to show me if I was close to it or was completely wrong and should start from scratch. Cheers.

Edited August 9, 2008 by TheDarkEngineer

[BrettF]

Maybe something like this:

Global Const $BASS_ATTRIB_MUSIC_BPM = 0x103

; DLL Stuff
$test_mp3 = "d:\my documents\My Music\Nirvana20-20Smells20Like20Teen20Spirit.mp3"
;$test_mp3 = "d:\my documents\autoit\Media Player\Downloaded Files\BASS DLL\SAMPLES\6chan\6chan.ogg"
$bassdll = DllOpen("bass.dll")

$ret = DllCall($bassdll, "int", "BASS_Init", "int", -1, _
        "int", 44100, _
        "int", 0, _
        "hwnd", 0, _
        "ptr", 0)
If Not $ret[0] Then
    MsgBox(0, "Error", 'Error initializing audio!');
    Exit
EndIf

$fName = DllStructCreate("char[255]")
DllStructSetData($fName, 1, $test_mp3)
$stream = DllCall($bassdll, "int", "BASS_StreamCreateFile", "int", False, "ptr", DllStructGetPtr($fName), "uint64", 0, "uint64", 0, "dword", 0x200)
$music_handle = $stream[0]
$fName = 0
$ret = DllCall($bassdll, "int", "BASS_ChannelPlay", "dword", $music_handle, "int", 0)

$return2 = DllStructCreate ("ptr")

$bpmdata = DllCall("bass.dll","int", "BASS_ChannelGetAttribute","DWORD",$music_handle, "DWORD",$BASS_ATTRIB_MUSIC_BPM, "ptr", DllStructGetPtr ($return2))

$ret = DllStructGetData ($return2, 1)
MsgBox (0, "", $ret)

Still learning dll calls using Structs... Getting better though

[davecollinsnz]

Thanks for the code, but I don't think I'm getting the data back I need. I'm going start from scratch and try again. If I ever figure it out, I'll post the code.

[BrettF]

I didn't work for me either, but you had some constants missing, but I'm sure we're headed in the right direction