[python-win32] [Python-Dev] Still looking for volunteer to

[Ray Schumacher]

I wrote a little ditty to set Win volume, which will also check for what you want (attached)

On my system, just running it prints:

C:\projects\sound>PYTHON VOL.PY
cbStruct 24
dwControlID 1
cChannels 1
cMultipleItems 0
cbDetails 4
paDetails c_ulong(32639)

waveOutGetNumDevs= 1
mixerGetNumDevs 1
res: 0
wMid= 131133
wPid= 821793
vDriverVersion= 1852729687
szPname= ov Videum Wave Playback  4Ä  ¤
dwFormats= 2162690
wChannels= 4
res 0
l: 0 r: 0

Ray

At 04:51 PM 3/13/2006, Roger Upole wrote:

>Trent Mick wrote:
>> Does anybody know of a way to programmatically check if a particular
>> Windows box has a soundcard installed and configured?
>> 
>> Background:
>> I'm running a Windows buildbot for Python and the test suite fails on
>> test_winsound.py because the box doesn't have a sound card setup. (The
>> "Sound" Control Panel items says there are "No Playback Devices" for
>> Sound Playback.)
>
>WMI can list sound devices.
>
>import win32com.client
>wmi=win32com.client.GetObject('winmgmts:')
>scs=wmi.InstancesOf('win32_sounddevice')
>for sc in scs:
>  print  sc.Properties_('Name'), sc.Properties_('Status')
>
>
>You might also have to check one of the other properties
>to make sure the device is actually operating, I don't
>have a non-functional device to test with.
>
>       Roger
>
>_______________________________________________
>Python-win32 mailing list
>Python-win32 at python.org
>http://mail.python.org/mailman/listinfo/python-win32
-------------- next part --------------
#!/usr/bin/env python
#Boa:PyApp:main
modules = {}


import ctypes

mixerSetControlDetails = (
    ctypes.windll.winmm.mixerSetControlDetails)
    
mixerGetControlDetails = (
    ctypes.windll.winmm.mixerGetControlDetailsA)

# Some constants
MIXER_OBJECTF_MIXER = 0 # mmsystem.h
VOLUME_CONTROL_ID = 0     # Same on all machines?
SPEAKER_LINE_FADER_ID = 1 # "Identifier <identifier> in OID value does not resolve to a positive integer"
MINIMUM_VOLUME = 0     # fader control (MSDN Library)
MAXIMUM_VOLUME = 65535 # fader control (MSDN Library)

class MIXERCONTROLDETAILS(ctypes.Structure):
    _pack_ = 1
    _fields_ = [('cbStruct', ctypes.c_ulong),
                ('dwControlID', ctypes.c_ulong),
                ('cChannels', ctypes.c_ulong),
                ('cMultipleItems', ctypes.c_ulong),
                ('cbDetails', ctypes.c_ulong),
                ('paDetails', ctypes.POINTER(ctypes.c_ulong))]

def setVolume(volume):
    """Set the speaker volume on the 'Volume Control' mixer"""
    if not (MINIMUM_VOLUME <= volume <= MAXIMUM_VOLUME):
        raise ValueError, "Volume out of range"
    cd = MIXERCONTROLDETAILS(ctypes.sizeof(MIXERCONTROLDETAILS),
                             SPEAKER_LINE_FADER_ID,
                             1, 0,
                             ctypes.sizeof(ctypes.c_ulong),
                             ctypes.pointer(ctypes.c_ulong(volume)))
    ret = mixerSetControlDetails(VOLUME_CONTROL_ID,
                                 ctypes.byref(cd),
                                 MIXER_OBJECTF_MIXER)
    if ret != 0:
        print WindowsError, "Error %d while setting volume" % ret
        
    ret = mixerGetControlDetails(VOLUME_CONTROL_ID,
                                 ctypes.byref(cd),
                                 MIXER_OBJECTF_MIXER)
    if ret != 0:
        print WindowsError, "Error %d while setting volume" % ret
    else:
        print 'cbStruct', cd.cbStruct
        print 'dwControlID', cd.dwControlID
        print 'cChannels', cd.cChannels
        print 'cMultipleItems', cd.cMultipleItems
        print 'cbDetails', cd.cbDetails
        print 'paDetails', cd.paDetails.contents
    return

setVolume((2**16-1)/2) 



from ctypes import *
from struct import *

winmm= windll.winmm
print
print 'waveOutGetNumDevs=',winmm.waveOutGetNumDevs()
print 'mixerGetNumDevs', winmm.mixerGetNumDevs()

wvcps= ' '*52
print 'res:', winmm.waveOutGetDevCapsA(0,wvcps,len(wvcps))

res = unpack('IIL32cLI', wvcps)
wMid=res[0]
wPid=res[1]
vDriverVersion=res[2]
szPname=''.join(res[3:35])
dwFormats=res[35]
wChannels=res[36]
print 'wMid=',wMid
print 'wPid=',wPid
print 'vDriverVersion=',vDriverVersion
print 'szPname=',szPname
print 'dwFormats=',dwFormats
print 'wChannels=',wChannels

vol=c_ulong()
print 'res', winmm.waveOutGetVolume(0, byref(vol))

print 'l:', vol.value & 0xffff, 'r:',vol.value >> 16 # left, right