def GetMixerControl(componentType, ctrlType, deviceId=0):
"""
Obtains an appropriate pointer and info for the volume control
This function attempts to obtain a mixer control. Raises
SoundMixerException if not successful.
"""
deviceId = GetDeviceId(deviceId)
hmixer = HMIXER()
# Obtain the hmixer struct
rc = mixerOpen(byref(hmixer), deviceId, 0, 0, 0)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
mixerLineControls = MIXERLINECONTROLS()
mixerLineControls.cbStruct = sizeof(MIXERLINECONTROLS)
mixerLine = MIXERLINE()
mixerLine.cbStruct = sizeof(MIXERLINE)
mixerControl = MIXERCONTROL()
mixerControl.cbStruct = sizeof(MIXERCONTROL)
mixerLine.dwComponentType = componentType
# Obtain a line corresponding to the component type
rc = mixerGetLineInfo(
hmixer,
byref(mixerLine),
MIXER_GETLINEINFOF_COMPONENTTYPE
)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
mixerLineControls.dwLineID = mixerLine.dwLineID
mixerLineControls.dwControlType = ctrlType
mixerLineControls.cControls = 1
mixerLineControls.cbmxctrl = sizeof(mixerControl)
mixerLineControls.pamxctrl = pointer(mixerControl)
# Get the control
rc = mixerGetLineControls(
hmixer,
byref(mixerLineControls),
MIXER_GETLINECONTROLSF_ONEBYTYPE
)
if MMSYSERR_NOERROR != rc:
raise SoundMixerException()
return hmixer, mixerControl
def GetMixerControl(componentType, ctrlType, deviceId=0):
"""
Obtains an appropriate pointer and info for the volume control
This function attempts to obtain a mixer control. Raises
SoundMixerException if not successful.
"""
deviceId = GetDeviceId(deviceId)
hmixer = HMIXER()
# Obtain the hmixer struct
rc = mixerOpen(byref(hmixer), deviceId, 0, 0, 0)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
mixerLineControls = MIXERLINECONTROLS()
mixerLineControls.cbStruct = sizeof(MIXERLINECONTROLS)
mixerLine = MIXERLINE()
mixerLine.cbStruct = sizeof(MIXERLINE)
mixerControl = MIXERCONTROL()
mixerControl.cbStruct = sizeof(MIXERCONTROL)
mixerLine.dwComponentType = componentType
# Obtain a line corresponding to the component type
rc = mixerGetLineInfo(
hmixer,
byref(mixerLine),
MIXER_GETLINEINFOF_COMPONENTTYPE
)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
mixerLineControls.dwLineID = mixerLine.dwLineID
mixerLineControls.dwControlType = ctrlType
mixerLineControls.cControls = 1
mixerLineControls.cbmxctrl = sizeof(mixerControl)
mixerLineControls.pamxctrl = pointer(mixerControl)
# Get the control
rc = mixerGetLineControls(
hmixer,
byref(mixerLineControls),
MIXER_GETLINECONTROLSF_ONEBYTYPE
)
if MMSYSERR_NOERROR != rc:
raise SoundMixerException()
return hmixer, mixerControl
def GetDeviceLines(deviceId=0):
deviceId = GetDeviceId(deviceId)
mixercaps = MIXERCAPS()
mixerline = MIXERLINE()
hmixer = HMIXER()
# Obtain the hmixer struct
rc = mixerOpen(byref(hmixer), deviceId, 0, 0, 0)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
if mixerGetDevCaps(deviceId, byref(mixercaps), sizeof(MIXERCAPS)):
raise SoundMixerException()
for destinationNum in range(mixercaps.cDestinations):
mixerline.cbStruct = sizeof(MIXERLINE)
mixerline.dwDestination = destinationNum
if mixerGetLineInfo(hmixer, byref(mixerline),
MIXER_GETLINEINFOF_DESTINATION):
continue
print "Destination:", destinationNum, mixerline.szName
for name in GetControls(hmixer, mixerline):
print " Control:", name
for sourceNum in range(mixerline.cConnections):
mixerline.cbStruct = sizeof(MIXERLINE)
mixerline.dwDestination = destinationNum
mixerline.dwSource = sourceNum
if mixerGetLineInfo(hmixer, byref(mixerline),
MIXER_GETLINEINFOF_SOURCE):
continue
print " Source:", sourceNum, mixerline.szName
for name in GetControls(hmixer, mixerline):
print " Control:", name
def GetDeviceLines(deviceId=0):
deviceId = GetDeviceId(deviceId)
mixercaps = MIXERCAPS()
mixerline = MIXERLINE()
hmixer = HMIXER()
# Obtain the hmixer struct
rc = mixerOpen(byref(hmixer), deviceId, 0, 0, 0)
if rc != MMSYSERR_NOERROR:
raise SoundMixerException()
if mixerGetDevCaps(deviceId, byref(mixercaps), sizeof(MIXERCAPS)):
raise SoundMixerException()
for destinationNum in range(mixercaps.cDestinations):
mixerline.cbStruct = sizeof(MIXERLINE)
mixerline.dwDestination = destinationNum
if mixerGetLineInfo(
hmixer, byref(mixerline), MIXER_GETLINEINFOF_DESTINATION
):
continue
print "Destination:", destinationNum, mixerline.szName
for name in GetControls(hmixer, mixerline):
print " Control:", name
for sourceNum in range(mixerline.cConnections):
mixerline.cbStruct = sizeof(MIXERLINE)
mixerline.dwDestination = destinationNum
mixerline.dwSource = sourceNum
if mixerGetLineInfo(
hmixer, byref(mixerline), MIXER_GETLINEINFOF_SOURCE
):
continue
print " Source:", sourceNum, mixerline.szName
for name in GetControls(hmixer, mixerline):
print " Control:", name