Audio playback from within a state machine without halting execution

I have created a state machine that acquires and analyzes an input signal and transitions states based on triggers detected within that signal. In one particular state I need to play back a prerecorded file (right now I am just using a .wav file for testing purposes). I understand that due to the data flow model the state machine hangs up during the playback state until the playback is finished, but I need to find someway around this. Obviously, whenever the machine hangs up it cannot continue acquiring and analyzing the signal. How can I start the playback from within the state machine without halting its execution?
Solved!
Go to Solution.

Do you use the sound output VIs? If you do, try this. On the "Play Sound File VI" set the timeout value=0
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Similar Messages

Attempting to run audio playback bar within Captivate

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Looks like that's using loadMovie to bring in the audio file
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something like "_root._root" for examples of how others have
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Erik
Skipthomp wrote:
> Actually, I created the swf file in Flash MX using the
following instructions:
>
>
>
http://www.actionscript.org/resources/articles/167/1/Flash-MX-Audio-Player/Page1
> .html
>
> Other than attempting to create a playback bar in Flash,
is there another way
> to do this?
>
Erik Lord
http://www.capemedia.net
Adobe Community Expert - Authorware
http://www.adobe.com/communities/experts/
http://www.awaretips.net -
samples, tips, products, faqs, and links!
*Search the A'ware newsgroup archives*
http://groups.google.com/group/macromedia.authorware

ATV (Gen3) Newest updates severely distort audio playback from iTunes. Please Help!!!

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Dave, I have had this problem on my MacBook Pro for many months. I've tried EVERYTHING Apple suggested - SMC reset, PRAM reset, everything EXCEPT take it in to be serviced by Apple. Here is my solution, which overcomes the hardware failure caused by the headphone jack optical sensor thinking something is plugged in there when there isn't.
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Elements 11 won't play audio mp3 from within slide show

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How do I remove an old version of the Apple Software Updater from a Windows XP machine without a software disk?

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I can't get any audio playback from FCP X (or Premier Pro for that matter)â¦

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Make an appointment to your nearest Apple Genius bar.

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How do I get the audio playback from the source monitor to work? I have the trial version of the latest premiere and the audio works in that but not cs6

I have the trial version of the latest premiere and the audio works in that but not cs6

More information needed for someone to help... please click below and provide the requested information
-Premiere Pro Video Editing Information FAQ http://forums.adobe.com/message/4200840
-especially your sound hardware, and the details of your video

Changing states from within a component

Let's say that I have a TileList that is rendering data in a
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I don't want to place the click-attribute in the TileList,
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way here... Is there an equivallence to
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Thanks for any suggestions or best practices. I want the easy
way out.
This is the general structure...
<mx:Application>
<mx:states>
<mx:State id="state1"/>
<mx:State id="state2"/>
<mx:State id="state3"/>
</mx:states>
<mx:TileList dataprovider="{...}">
<mx:itemRenderer>
<mx:component>
<mx:VBox id="ClickThisBoxToChangeStates">
<mx:Image/>
<mx:Label/>
</mx:Vbox>
</mx:component>
</mx:itemRenderer>
</mx:TileList>
</mx:Application>

Your assumption is right.
It doesn't work because there is no state2-state defined
within the mx:component.
In the documentation about changing states it says that I can
go from application level and change states within a component;
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how I can change a state at application level from within a state.
When I try, it says (at runtime) that the state is not defined.
So I don't know why <mx:VBox
click="currentState='state2'"/> doesn't work.
I apprechiate your expertese a lot.

Producer Consumer with a state machine within the consumer

Hi All,
I have been trying to develop a data acquisition system with the producer consumer architecture. To the left of the two main loops I initialize the serial port and any constants and variables im using. I also have an obtain queue VI needed for enqueue and dequeue. Then in the producer loop i have a state machine. The first state is where I wait for a button press on the front panel to write a GO signal on the serial line which will tell the device connected to the serial port to begin sampling data. After this button press I go into the next state which is called my read state.
In the read state I use a property node to read all of the available bytes at the serial port and then enqueue this collected data into a queue. The state machine then is directed to continously go to the read state again and collect more data.
Now this is where my dilemma is...... The consumer loop has the dequeue VI inside it and after this VI i have a state machine (while loop and case structure) which contains the following states
1. Build Array - build an array from the dequeue element and if there is any left over data from the parsing states it will build an array with the left over data and the dequeued data
2. Determine packet type - this state looks for the packet type byte(not necessarily the first byte in the message) and also check the next byte (packet length) to ensure that I am at the begininng of this chunk of data. This state may be a little slow because there can be three different packet types and based on this byte and the packet length it may have to search the array several time to find the valid starting point. This state also determine the next state to go to based on the packet type.
3 packet type 1 parsing - parse data and store the remaining data it leftOver array. Go to exit state.
4 packet type 2 parsing - "" ""
5 packet type 3 parsing - "" ""
6 exit - leave this state machine and fall back to the consumer while loop.
After it exit I think it should fall back to the consumer while loop and dequeue more data and enter the state machine again to build a new array with the dequeued data and leftover data. It seems to work when I trace the execution using the Highlight execution feature, however when I run this all at full speed, it seems to go into the consumers 1st and 2nd states back and forth and not completely go through the state machine.
I tried adding in a delay in the producer loop to give the consumer loop time, but I didnt notice any difference. Is it possible that my dequeue element is retreiving more data while im still in the state machine, causing the execution to leave the state machine before it finished all states?
Is there a better approach to take to solve this problem. Basically I need to read data at a 1,000,000 baudrate and parse it as quickly as possible so that I can break it up into 3 different packet types, write the data to a file, and graph the actual data (header info removed) in realtime. I need to also ensure that I am not losing any of the collected data. Data loss cannnot occur.

A couple of things more to go along with Ben's pointers:
You convert your data from a string, to a U8 array, to a Hex string array in the producer loop, then convert back to a integer to determine what to do with it. In the process, you create two or three copies of your data, slowing yourself down quite a bit. The code would be quite a bit more efficient if you left the data as a U8 array. You can change the format of the controls and indicators to show hex values instead of integer by right clicking on them and selecting Format and Precision...
Your search code is fairly inefficient. I made a whack at making it a bit better. See attachment below.
If you continue to run into race conditions, you can debug them using a calls to the Windows debug write sprinkled liberally about your code. Check out the post here for more information.
Don't let your lack of format LabVIEW training stop you. The biggest thing to get is the data flow paradigm (aka data is wires, not registers). Once you get past that and learn how to pass data around using shift registers, queues, events, etc, you are most of the way to mastering LabVIEW. The rest is just learning the plethora of functionality LabVIEW gives you (yes, I have reimplemented LabVIEW native code more than once in the process of learning).
Let us know if you need more help.
This account is no longer active. Contact ShadesOfGray for current posts and information.
Attachments:
serialUtil_V3_DFG.zip ‏137 KB

Audio playback delayed thru Firewire monitor - JVC BR-DV3000

First I apologize for the length of this post, but I want to make sure I've adequately described the problem. For years, I've edited with FCP using a JVC HR-DVS2U (DV/SVHS combo deck) with great results. I use it to capture and output through firewire, also connected is a monitor and a UVW-1600 Beta machine.
Now a buddy of mine also has a system using a JVC BR-DV3000. When I attempted to set his system up similar to mine, using the DV deck as the conduit for monitoring and recording to beta, he complained about audio dropping out at the beginning of transitions in the timeline. This was the weirdest thing! How does the DV machine know that a transition is taking place?! I thought it was just data out. I finally traded out machines with him and hooked it up to my system. At first, I didn't have any problems. I mainly edit 30-second commercials, so I played back a timeline with three dozen transitions in it without a hitch! So now I'm really confused, until one day I had a 20 minute long timeline of about 20 promos back to back, all digitized from beta. Sure enough there was the audio playback delay. I switched the audio playback from firewire to computer audio out and I did not have the problem, but I could not record out to tape in this configuration. Then I thought maybe it's just the length of the timeline, so I opened up a commercial timeline that plays back fine and pasted one of the beta promos in there. The 30 second spot played back fine and then when it hit the beta vid it had the audio dropout. Now understand, the audio is NOT out of sync, it just drops out for about two seconds when playing back from the timeline. You can watch the VU meter on the deck, it completely loses the audio for two seconds, mostly when you first start the timeline and at most transitions. I now think it may have something to do with the source material. I just digitized some video from DV that was shot on a JVC camera, when most of the stuff I shoot is from a Canon XL1. The JVC camera footage has this dropout issue. Any clues?

This has happened to me too. The problem is with the firmware in older DV3000 decks. JVC has an update, but you can't do it yourself. JVC or your dealer will have to do it for you. In the meantime there is a workaround. Make sure your DV3000 is powered on FIRST. Then start FCP. That trick always worked for me. Good Luck.

State machine VS producer consumer architecture - Time Analysis

After learning various methods to program efficiently and learn how to use SM and Producer consumer. I built a program to control stepper motor in both these techniques.
Here is the RESULT. As we can see a simple state machine without any complicated producer consumer technique performs faster than the second one.
I am not sure which is still the best based on performance and optimization. Please advise which one should I keep and why.
Abhilash S Nair
Research Assistant @ Photonic Devices and Systems lab
[ LabView professional Development System - Version 11.0 - 32-bit ]
LabView Gear:
1. NI PXI-7951R & NI 5761
2. The Imaging Source USB 3.0 monochrome camera with trigger : DMK 23UM021
OPERATING SYSTEM - [ MS windows 7 Home Premium 64-bit SP-1 ]
CPU - [Intel Core i7-2600 CPU @ 3.40Ghz ]
MEMORY - [ 16.0 GB RAM ]
GPU - [ NVIDIA GeForce GT 530 ]

This is with state machine alone
Abhilash S Nair
Research Assistant @ Photonic Devices and Systems lab
[ LabView professional Development System - Version 11.0 - 32-bit ]
LabView Gear:
1. NI PXI-7951R & NI 5761
2. The Imaging Source USB 3.0 monochrome camera with trigger : DMK 23UM021
OPERATING SYSTEM - [ MS windows 7 Home Premium 64-bit SP-1 ]
CPU - [Intel Core i7-2600 CPU @ 3.40Ghz ]
MEMORY - [ 16.0 GB RAM ]
GPU - [ NVIDIA GeForce GT 530 ]
Attachments:
Control 1.ctl ‏6 KB
Control 2.ctl ‏6 KB
Motor-UNI_Directiona Dev 3-TIME_ANALYSIS-2.vi ‏54 KB

Replacing a state machine?

I am fairly new to using state machines and am hoping there is a simple solution to this question. I have one state machine that is saved (ie StateMachine1.ctl). I created a new state machine (StateMachine2.ctl) and want to replace all instances of StateMachine1 with StateMachine2 in my VI. Is there a simple way of changing the state machine without losing all the linked instances?
Thanks.
LWolfe.
Solved!
Go to Solution.

LWolfe wrote:
I am fairly new to using state machines and am hoping there is a simple solution to this question. I have one state machine that is saved (ie StateMachine1.ctl). I created a new state machine (StateMachine2.ctl) and want to replace all instances of StateMachine1 with StateMachine2 in my VI. Is there a simple way of changing the state machine without losing all the linked instances?
Thanks.
LWolfe.
Let's make sure we are using the correct terminolgy here. It seems that what you are calling a "state machine" is really a custom control, probably typedef'd and because it was typedef'd, probably an enum. I like to make mistakes like that, mistakenly calling something by the name of something else very closely associated with it.
So is your question really, "How do I replace one custom control with another?"
In this case, it might be just easier to modify your first control and forget about using the second. Assuming again that it is a typedef'd enum control, modifying the typedef'd enum that is already part of your state machine will ensure that the changes are propagated to all the other places.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

Audio playback from within a state machine without halting execution

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