📄 mixer.cs
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using System;
using System.Text;
using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace LanMsg.AV
{
public class Mixer
{
IntPtr m_hmx;
public event System.EventHandler MixerControlChange;
private event System.EventHandler PreMixerControlChange;
private void OnMixerControlChange(int controlid)
{
if(this.PreMixerControlChange!=null)this.PreMixerControlChange(this,System.EventArgs.Empty);
if(this.MixerControlChange!=null)this.MixerControlChange(this,System.EventArgs.Empty);
}
MixerCallbackListener listener;
public Mixer(Control c)
{
this.listener=new MixerCallbackListener(this);
this.listener.AssignHandle(c.Handle);
Mixer.mixerOpen(ref m_hmx,0,(int)c.Handle,0,Mixer.MIXER_OBJECTF_MIXER|0x00010000);
}
public IntPtr Handle
{
get{return this.m_hmx;}
}
public void Close()
{
// this.listener.ReleaseHandle();
Mixer.mixerClose(this.m_hmx);
}
private class MixerCallbackListener:NativeWindow
{
private Mixer mixer;
public MixerCallbackListener(Mixer mixer)
{
this.mixer=mixer;
}
protected override void WndProc(ref Message m)
{
if(m.Msg==Mixer.MM_MIXM_CONTROL_CHANGE)
{
this.mixer.OnMixerControlChange((int)m.LParam);
}
base.WndProc (ref m);
}
}
public class MixerControlDetail
{
private int component_type;
Mixer mixer;
uint lineid;
int mute_controlid,volume_controlid;
string name;
int max,min;
bool mute;int volume;
public string Name
{
get{return this.name;}
}
public int Volume
{
get{return this.volume;}
set{this.volume=value;this.SetValue(volume_controlid,value);}
}
public bool Mute
{
get{return this.mute;}
set
{
if(this.mute!=value)
{
this.mute=value;
if(value)
this.SetValue(mute_controlid,1);
else
this.SetValue(mute_controlid,0);
}
}
}
public int Max
{
get{return this.max;}
}
public int Min
{
get{return this.min;}
}
public MixerControlDetail(Mixer mixer,int component_type)
{
this.component_type=component_type;
this.mixer=mixer;
this.Initialize();
mixer.PreMixerControlChange+=new EventHandler(mixer_PreMixerControlChange);
}
private MIXERLINE GetLine()
{
MIXERLINE ml=new MIXERLINE();
if(this.component_type==MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE)
{
MIXERLINE inLine=new MIXERLINE();
inLine.cbStruct=Marshal.SizeOf(inLine);
inLine.dwComponentType=Mixer.MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
Mixer.mixerGetLineInfo((int)mixer.Handle,ref inLine,Mixer.MIXER_GETLINEINFOF_COMPONENTTYPE);
for(int i=0;i<inLine.cConnections;i++)
{
ml=new MIXERLINE();
ml.cbStruct=Marshal.SizeOf(ml);
ml.dwSource=(uint)i;
ml.dwDestination=inLine.dwDestination;
Mixer.mixerGetLineInfo((int)mixer.Handle,ref ml,Mixer.MIXER_GETLINEINFOF_SOURCE);
if(ml.dwComponentType==this.component_type)break;
}
}
else
{
ml=new MIXERLINE();
ml.cbStruct=Marshal.SizeOf(ml);
ml.dwComponentType=this.component_type;
Mixer.mixerGetLineInfo((int)mixer.Handle,ref ml, Mixer.MIXER_OBJECTF_HMIXER|Mixer.MIXER_GETLINEINFOF_COMPONENTTYPE);
}
return ml;
}
private void Initialize()
{
MIXERLINE ml=this.GetLine();
this.lineid=ml.dwLineID;
this.name=ml.szName;
MIXERCONTROL ctl=this.GetLineControl(Mixer.MIXERCONTROL_CONTROLTYPE_VOLUME);
this.min=ctl.Bounds.dwMinimum;
this.max=ctl.Bounds.dwMaximum;
this.volume_controlid=ctl.dwControlID;
ctl=this.GetLineControl(Mixer.MIXERCONTROL_CONTROLTYPE_MUTE);
this.mute_controlid=ctl.dwControlID;
this.volume=this.GetValue(this.volume_controlid);
this.mute=this.GetValue(this.mute_controlid)==0;
}
private int GetValue(int controlid)
{
IntPtr volumes=Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int))*2);
Marshal.WriteInt32(volumes,0);
LanMsg.AV.MIXERCONTROLDETAILS details=new MIXERCONTROLDETAILS();
details.cbStruct=Marshal.SizeOf(details);
details.cChannels=1;
details.cbDetails=4;
details.cMultipleItems=0;
details.dwControlID=controlid;
details.paDetails=(int)volumes;
Mixer.mixerGetControlDetails(mixer.Handle,ref details,0);
int ret=Marshal.ReadInt32(volumes);
Marshal.FreeCoTaskMem(volumes);
return ret;
}
private void SetValue(int controlid,int value)
{
IntPtr volumes=Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(int))*2);
Marshal.WriteInt32(volumes,value);
LanMsg.AV.MIXERCONTROLDETAILS details=new MIXERCONTROLDETAILS();
details.cbStruct=Marshal.SizeOf(details);
details.cChannels=1;
details.cbDetails=4;
details.cMultipleItems=0;
details.dwControlID=controlid;
details.paDetails=(int)volumes;
int r=Mixer.mixerSetControlDetails(mixer.Handle,ref details,0);
System.Diagnostics.Trace.WriteLine(r.ToString());
int ret=Marshal.ReadInt32(volumes);
System.Diagnostics.Trace.WriteLine(ret.ToString());
Marshal.FreeCoTaskMem(volumes);
}
private MIXERCONTROL GetLineControl(int controlType)
{
MIXERCONTROL mxc=new MIXERCONTROL();mxc.Bounds=new Volume();
MIXERLINECONTROLS mxlc=new MIXERLINECONTROLS();
IntPtr p=Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(MIXERCONTROL)));
Marshal.StructureToPtr(mxc,p,true);
mxlc.cbStruct = Marshal.SizeOf(typeof(MIXERLINECONTROLS));
mxlc.dwLineID =this.lineid;
mxlc.dwControlType =controlType;
mxlc.cControls = 1;
mxlc.cbmxctrl = Marshal.SizeOf(typeof(MIXERCONTROL));
mxlc.pamxctrl = p;
Mixer.mixerGetLineControls((int)mixer.Handle,ref mxlc,Mixer.MIXER_OBJECTF_HMIXER |Mixer.MIXER_GETLINECONTROLSF_ONEBYTYPE);
mxc=(MIXERCONTROL)Marshal.PtrToStructure(mxlc.pamxctrl,typeof(MIXERCONTROL));
return mxc;
}
private void mixer_PreMixerControlChange(object sender, EventArgs e)
{
this.Initialize();
}
}
#region
[DllImport("winmm.dll", EntryPoint="mixerClose")]
public static extern int mixerClose (
int hmx
);
[DllImport("winmm.dll", EntryPoint="mixerGetControlDetails")]
public static extern int mixerGetControlDetails (
int hmxobj,
ref MIXERCONTROLDETAILS pmxcd,
int fdwDetails
);
[DllImport("winmm.dll", EntryPoint="mixerGetDevCaps")]
public static extern int mixerGetDevCaps (
int uMxId,
MIXERCAPS pmxcaps,
int cbmxcaps
);
[DllImport("winmm.dll", EntryPoint="mixerGetID")]
public static extern int mixerGetID (
int hmxobj,
ref int pumxID,
int fdwId
);
[DllImport("winmm.dll", EntryPoint="mixerGetLineControls")]
public static extern int mixerGetLineControls (
int hmxobj,
ref MIXERLINECONTROLS pmxlc,
int fdwControls
);
[DllImport("winmm.dll", EntryPoint="mixerGetLineInfo")]
public static extern int mixerGetLineInfo (
int hmxobj,
ref MIXERLINE pmxl,
int fdwInfo
);
[DllImport("winmm.dll", EntryPoint="mixerGetNumDevs")]
public static extern int mixerGetNumDevs ();
[DllImport("winmm.dll", EntryPoint="mixerMessage")]
public static extern int mixerMessage (
int hmx,
int uMsg,
int dwParam1,
int dwParam2
);
[DllImport("winmm.dll", EntryPoint="mixerOpen")]
public static extern int mixerOpen (
ref int phmx,
int uMxId,
int dwCallback,
int dwInstance,
int fdwOpen
);
[DllImport("winmm.dll", EntryPoint="mixerSetControlDetails")]
public static extern int mixerSetControlDetails (
int hmxobj,
ref MIXERCONTROLDETAILS pmxcd,
int fdwDetails
);
[DllImport("winmm.dll", EntryPoint="mixerClose")]
public static extern int mixerClose (
IntPtr hmx
);
[DllImport("winmm.dll", EntryPoint="mixerGetControlDetails")]
public static extern int mixerGetControlDetails (
IntPtr hmxobj,
ref MIXERCONTROLDETAILS pmxcd,
uint fdwDetails
);
[DllImport("winmm.dll", EntryPoint="mixerGetDevCaps")]
public static extern int mixerGetDevCaps (
IntPtr uMxId,
ref MIXERCAPS pmxcaps,
int cbmxcaps
);
[DllImport("winmm.dll", EntryPoint="mixerGetID")]
public static extern int mixerGetID (
IntPtr hmxobj,
ref int pumxID,
uint fdwId
);
[DllImport("winmm.dll", EntryPoint="mixerGetLineControls")]
public static extern int mixerGetLineControls (
int hmxobj,
ref MIXERLINECONTROLS pmxlc,
uint fdwControls
);
[DllImport("winmm.dll", EntryPoint="mixerGetLineInfo")]
public static extern int mixerGetLineInfo (
int hmxobj,
ref MIXERLINE pmxl,
uint fdwInfo
);
[DllImport("winmm.dll", EntryPoint="mixerMessage")]
public static extern int mixerMessage (
IntPtr hmx,
int uMsg,
int dwParam1,
int dwParam2
);
[DllImport("winmm.dll", EntryPoint="mixerOpen")]
public static extern int mixerOpen (
ref IntPtr phmx,
int uMxId,
int dwCallback,
int dwInstance,
uint fdwOpen
);
[DllImport("winmm.dll", EntryPoint="mixerSetControlDetails")]
public static extern int mixerSetControlDetails (
IntPtr hmxobj,
ref MIXERCONTROLDETAILS pmxcd,
uint fdwDetails
);
public const uint MIXER_OBJECTF_HANDLE =0x80000000;
public const int MIXER_OBJECTF_MIXER =0x00000000;
public const uint MIXER_OBJECTF_HMIXER =(MIXER_OBJECTF_HANDLE|MIXER_OBJECTF_MIXER);
public const int MIXER_OBJECTF_WAVEOUT =0x10000000;
//public const int MIXER_OBJECTF_HWAVEOUT =(MIXER_OBJECTF_HANDLE|MIXER_OBJECTF_WAVEOUT);
public const int MIXER_OBJECTF_WAVEIN =0x20000000;
//public const int MIXER_OBJECTF_HWAVEIN =(MIXER_OBJECTF_HANDLE|MIXER_OBJECTF_WAVEIN);
public const int MIXER_OBJECTF_MIDIOUT =0x30000000;
//public const int MIXER_OBJECTF_HMIDIOUT =(MIXER_OBJECTF_HANDLE|MIXER_OBJECTF_MIDIOUT);
public const int MIXER_OBJECTF_MIDIIN =0x40000000;
//public const int MIXER_OBJECTF_HMIDIIN =(MIXER_OBJECTF_HANDLE|MIXER_OBJECTF_MIDIIN);
public const int MIXER_OBJECTF_AUX =0x50000000;
public const int MIXER_GETLINEINFOF_DESTINATION = 0x00000000;
public const int MIXER_GETLINEINFOF_SOURCE =0x00000001;
public const int MIXER_GETLINEINFOF_LINEID =0x00000002;
public const int MIXER_GETLINEINFOF_COMPONENTTYPE =0x00000003;
public const int MIXERLINE_COMPONENTTYPE_DST_FIRST =0x00000000;
public const int MIXERLINE_COMPONENTTYPE_DST_SPEAKERS =(MIXERLINE_COMPONENTTYPE_DST_FIRST + 4);
public const int MIXERLINE_COMPONENTTYPE_SRC_FIRST =0x00001000;
public const int MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE =(MIXERLINE_COMPONENTTYPE_SRC_FIRST + 3);
public const int MIXERLINE_COMPONENTTYPE_DST_WAVEIN =(MIXERLINE_COMPONENTTYPE_DST_FIRST + 7);
public const int MIXERCONTROL_CT_CLASS_FADER =0x50000000;
public const int MIXERCONTROL_CT_UNITS_UNSIGNED =0x00030000;
public const int MIXERCONTROL_CT_CLASS_SWITCH =0x20000000;
public const int MIXERCONTROL_CT_SC_SWITCH_BOOLEAN =0x00000000;
public const int MIXERCONTROL_CT_UNITS_BOOLEAN = 0x00010000;
public const int MIXERCONTROL_CONTROLTYPE_BOOLEAN =(MIXERCONTROL_CT_CLASS_SWITCH | MIXERCONTROL_CT_SC_SWITCH_BOOLEAN | MIXERCONTROL_CT_UNITS_BOOLEAN);
public const int MIXERCONTROL_CONTROLTYPE_FADER =(MIXERCONTROL_CT_CLASS_FADER | MIXERCONTROL_CT_UNITS_UNSIGNED);
public const int MIXERCONTROL_CONTROLTYPE_VOLUME =(MIXERCONTROL_CONTROLTYPE_FADER + 1);
public const int MIXERCONTROL_CONTROLTYPE_MUTE =(MIXERCONTROL_CONTROLTYPE_BOOLEAN + 2);
public const int MIXER_GETLINECONTROLSF_ONEBYTYPE =0x00000002;
public const int MIXER_GETCONTROLDETAILSF_VALUE = 0x00000000;
public const int MM_MIXM_LINE_CHANGE =0x3D0; /* mixer line change notify */
public const int MM_MIXM_CONTROL_CHANGE =0x3D1; /* mixer control change notify */
#endregion
}
}
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