def GetControls(hmixer, mixerline):
numCtrls = mixerline.cControls
if numCtrls == 0:
return []
mixerControlArray = (MIXERCONTROL * numCtrls)()
mixerLineControls = MIXERLINECONTROLS()
mixerLineControls.cbStruct = sizeof(MIXERLINECONTROLS)
mixerLineControls.cControls = numCtrls
mixerLineControls.dwLineID = mixerline.dwLineID
mixerLineControls.pamxctrl = pointer(mixerControlArray[0])
mixerLineControls.cbmxctrl = sizeof(MIXERCONTROL)
mixerGetLineControls(hmixer, byref(mixerLineControls),
MIXER_GETLINECONTROLSF_ALL)
result = []
for i in range(numCtrls):
mixerControl = mixerControlArray[i]
dwControlType = mixerControl.dwControlType
controlClass = MIXER_CONTROL_CLASSES[dwControlType
& MIXERCONTROL_CT_CLASS_MASK]
controlClassTypeName = controlClass["types"][dwControlType]
flagNames = []
fdwControl = mixerControl.fdwControl
if fdwControl & MIXERCONTROL_CONTROLF_DISABLED:
flagNames.append("Disabled")
if fdwControl & MIXERCONTROL_CONTROLF_MULTIPLE:
flagNames.append("Multiple(%i)" % mixerControl.cMultipleItems)
if fdwControl & MIXERCONTROL_CONTROLF_UNIFORM:
flagNames.append("Uniform")
result.append((mixerControl.szName, controlClass["name"],
controlClassTypeName, ", ".join(flagNames)))
return result
def GetControls(hmixer, mixerline):
numCtrls = mixerline.cControls
if numCtrls == 0:
return []
mixerControlArray = (MIXERCONTROL * numCtrls)()
mixerLineControls = MIXERLINECONTROLS()
mixerLineControls.cbStruct = sizeof(MIXERLINECONTROLS)
mixerLineControls.cControls = numCtrls
mixerLineControls.dwLineID = mixerline.dwLineID
mixerLineControls.pamxctrl = pointer(mixerControlArray[0])
mixerLineControls.cbmxctrl = sizeof(MIXERCONTROL)
mixerGetLineControls(
hmixer, byref(mixerLineControls), MIXER_GETLINECONTROLSF_ALL
)
result = []
for i in range(numCtrls):
mixerControl = mixerControlArray[i]
dwControlType = mixerControl.dwControlType
controlClass = MIXER_CONTROL_CLASSES[
dwControlType & MIXERCONTROL_CT_CLASS_MASK
]
controlClassTypeName = controlClass["types"][dwControlType]
flagNames = []
fdwControl = mixerControl.fdwControl
if fdwControl & MIXERCONTROL_CONTROLF_DISABLED:
flagNames.append("Disabled")
if fdwControl & MIXERCONTROL_CONTROLF_MULTIPLE:
flagNames.append("Multiple(%i)" % mixerControl.cMultipleItems)
if fdwControl & MIXERCONTROL_CONTROLF_UNIFORM:
flagNames.append("Uniform")
result.append(
(
mixerControl.szName,
controlClass["name"],
controlClassTypeName,
", ".join(flagNames)
)
)
return result
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