How do I select ports for capturing audio?

Summary:
I am working on a project that needs to programmatically query the sound system and present the user with a list of choices of input lines (Port) to be captured (just one input at any time), with the ability for the user to control the volume of the selected input line (Port).
It seems that either:
a) I'm not querying the sound system correctly to get the information needed to do what I want
b) I don't understand the way the system is intended to present a logical description of the sound system
c) My system is bizarre
d) The (only) way I can think of to make this work is actually the correct way - and will be subject to failure on different machines.
I hope it's either option a) or b) - I can fix that; c) is a nuisance, but d) is a worry.
Discussion:
What I've found is that all 3 source Ports reported by AudioSystem queries are associated with Mixers that do not support TargetDataLines (each such Mixer presents a description of "Port Mixer"). It appears for each of the three (source) Port Mixers on my system, there is another logically distinct Mixer (each such Mixer presents a description of "Direct Audio Device: DirectSound Capture") that is somehow connected to the source Port Mixer. The only thing that I can find that indicates any connection between the two Mixers is the naming of the two Mixers: the Port Mixer is named "Port <someName>" and the Direct Audio Mixer is named "<someName>" (without the "Port" prefix). I confirm this logical connection between the two mixers by noting that when I read from a TargetDataLine on the Direct Audio Mixer I am capturing the audio present on the source Port of the similarly-named Port Mixer.
I'd be happy to just use the TargetDataLine from the Direct Audio Mixer and ignore the Port Mixer, but there are no controls on the former and I need to present a volume/gain control to the user, which only exists on the Ports of the latter.
Question:
Is it correct, and portable, to assume that there is this apparent 1:1 relationship between a mixer named "<someName>" and another mixer named "Port <someName>"? I have read the entire javax.sound.sampled tutorial, several times. I have read the often-recommended article at http://www.vsj.co.uk/java/display.asp?id=370
several times and while I believe I understand the concepts being presented, the configuration I have doesn't seem to match what is described there.
I've written code to query the audio system on my machine (Windows Vista) and the (shortened) output is below. Java version info:
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)
If there is some way to make this question better so as not to require an unreasonable amount of effort from anyone kind enough to answer just let me know.
Thanks.
AudioSystem Info::
Source Ports: 3
 LineInfo: Master Volume source port
 Port is a SOURCE
 Controls: 1
 LineInfo: LINE_IN source port
 Port is a SOURCE
 Controls: 1
 LineInfo: Master Volume source port
 Port is a SOURCE
 Controls: 1
Target Ports: 5
 LineInfo: SPEAKER target port
 Port is a TARGET
 Controls: 4
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 4
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 4
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 4
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 4
Mixer Info::
Found 13 mixers
Mixer Name: Primary Sound Driver
Description: Direct Audio Device: DirectSound Playback
Controls: NONE
Source Lines: 2
 LineInfo: interface SourceDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: 4
 LineInfo: interface Clip supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Target Lines: NONE
Mixer Name: Speakers (VIA High Definition Audio)
Description: Direct Audio Device: DirectSound Playback
Controls: NONE
Source Lines: 2
 LineInfo: interface SourceDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: 4
 LineInfo: interface Clip supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Target Lines: NONE
Mixer Name: SPDIF Interface (VIA High Definition Audio)
Description: Direct Audio Device: DirectSound Playback
Controls: NONE
Source Lines: 2
 LineInfo: interface SourceDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: 4
 LineInfo: interface Clip supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Target Lines: NONE
Mixer Name: Primary Sound Capture Driver
Description: Direct Audio Device: DirectSound Capture
Controls: NONE
Source Lines: NONE
Target Lines: 1
 LineInfo: interface TargetDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Mixer Name: Line In (VIA High Definition Au
Description: Direct Audio Device: DirectSound Capture
Controls: NONE
Source Lines: NONE
Target Lines: 1
 LineInfo: interface TargetDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Mixer Name: Stereo Mix (VIA High Definition
Description: Direct Audio Device: DirectSound Capture
Controls: NONE
Source Lines: NONE
Target Lines: 1
 LineInfo: interface TargetDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Mixer Name: CD Audio (VIA High Definition A
Description: Direct Audio Device: DirectSound Capture
Controls: NONE
Source Lines: NONE
Target Lines: 1
 LineInfo: interface TargetDataLine supporting 8 audio formats, and buffers of at least 32 bytes
 Controls: NONE
Mixer Name: Java Sound Audio Engine
Description: Software mixer and synthesizer
Controls: 1
Source Lines: 2
 LineInfo: interface SourceDataLine supporting 8 audio formats
 Controls: 4
 LineInfo: interface Clip supporting 8 audio formats, and buffers of 0 to 4194304 bytes
 Controls: 4
Target Lines: NONE
Mixer Name: Port Speakers (VIA High Definition A
Description: Port Mixer
Controls: NONE
Source Lines: NONE
Target Lines: 1
 LineInfo: SPEAKER target port
 Port is a TARGET
 Controls: 4
Mixer Name: Port SPDIF Interface (VIA High Defin
Description: Port Mixer
Controls: NONE
Source Lines: NONE
Target Lines: 1
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 4
Mixer Name: Port Stereo Mix (VIA High Definition
Description: Port Mixer
Controls: NONE
Source Lines: 1
 LineInfo: Master Volume source port
 Port is a SOURCE
 Controls: 1
Target Lines: 1
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 2
Mixer Name: Port Line In (VIA High Definition Au
Description: Port Mixer
Controls: NONE
Source Lines: 1
 LineInfo: LINE_IN source port
 Port is a SOURCE
 Controls: 1
Target Lines: 1
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 2
Mixer Name: Port CD Audio (VIA High Definition A
Description: Port Mixer
Controls: NONE
Source Lines: 1
 LineInfo: Master Volume source port
 Port is a SOURCE
 Controls: 1
Target Lines: 1
 LineInfo: Master Volume target port
 Port is a TARGET
 Controls: 2Edited by: user8620608 on Mar 7, 2011 9:51 PM
Edited by: ags on Mar 8, 2011 9:55 PM
Shortened code output. Added Exec summary. Trying to make it easy to help.

It seems that either:
a) I'm not querying the sound system correctly to get the information needed to do what I want
b) I don't understand the way the system is intended to present a logical description of the sound system
c) My system is bizarre
d) The (only) way I can think of to make this work is actually the correct way - and will be subject to failure on different machines.
I hope it's either option a) or b) - I can fix that; c) is a nuisance, but d) is a worry.Working through this logically...
SourceDataLines are things the user can read from, and TargetDataLines are things the user can write to...
You have SourceDataLines associated with the Speakers and the SPDIF Interface... both of those are outputs, but I think it's safe to assume those two "mixers" are actually loopback interfaces to monitor the outputs.
You have TargetDataLines associated with the CD Audio and Port Line In... both of those are inputs, and writing to them doesn't really make any sense...
It looks like your system is "being helpful" by providing a loopback interface (Master Volume target port) with each output port...
My best guess is that all of the ports with just source lines feed into a common area ("Master Volume") and then all feed out of that common area into a series of mixers that have a loopback SourceDataLine you can monitor the output on and a TargetDataLine that you can write to... and then they leave the system through whatever hardware they are associated with.
If that's not the case, then it's the case that you have multiple parallel paths through your Sound System, and you can "write" to things that should be inputs because those inputs have their own mixers.
Is it a safe bet that it's a 1:1 mapping? Well, I think it's a safe bet that either that's the case, or, it doesn't matter. You could run into problems down the line doing it that way, but, I'd recommend you:
1) Handle a normal system (system with a single port mixer) in the normal way
2) Handle a funky system like yours by assuming "Mixer <Source>" will give you the output of "Port <Source>"...
Because, frankly, I think that "Mixer <Source>" should give you the output of all of the "Port <Source>" that are enabled... or it'll just give you the output of the one Port. Either way, you should be fine.

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Thanks
jitendra

How to open a port for CCTV on Router Cisco DDR2201v1

Hello, I want to know how could I configure a Router Cisco DDR2201v1 for watching my CCTV System from anywhere with a internet connection. I already try to open a port in the NAT virtual server configuration but it didn't work. Could you help me please? Thanks
Can anybody tell me what's wrong with this configuration.

Hi.
Welcome to Cisco Home Community.
Please follow this link, https://supportforums.cisco.com/ for the correct product category.
Thanks.

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