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#1 Posted : Thursday, August 30, 2007 10:17:08 PM(UTC)
djohnson

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Hi,
I just recently began evaluating LeadTools Multimedia and I am trying to determine if it is capable of displaying (or at least provide the data so that I can generate) a waveform representation (audio amplitude graph) of the audio portion of the media file loaded in the control.

I have ran through the documentation and forums and dont see the question addressed with a difinitive answer.

can you explain how this could be done in a C# .Net app so that I may have some direction to start with?

Thanks in advance,
David Johnson
 

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#2 Posted : Sunday, September 2, 2007 11:56:37 PM(UTC)

Adnan Ismail  
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David,




One way
to do that is to use our LEAD Audio VU Meter Filter to repeatedly get left and right audio level values.
Another
way is to use our LEAD Audio Callback Filter, which returns all the values of audio samples that pass through it in a user-defined callback.

 
#3 Posted : Friday, September 7, 2007 12:35:37 PM(UTC)
jkottler

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Could you please post some example of using the VU meters in csharp with MM SDK 15? I can add the VU Meter to the AudioProcessors, but I can't seem to find the interface that lets me query it for levels, nor can I find the user interface dialog that's supposed to go with it!

Edit: For that matter, can you show examples of how to programmatically add and configure LEAD filters? I'd like to let my users control a "recording gain" control that's really a Volume filter inserted automatically.
 
#4 Posted : Sunday, September 9, 2007 5:57:02 AM(UTC)

Adnan Ismail  
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If you
want to programmatically work with our filters and access their interfaces, please see the following help topics:





- Programmatically Inserting a Processor Filter
- Access a Filter Interface


In addition to these two help topics, please check the LEADTOOLS Multimedia Filters help file and read help topic (ILMAVUMeter Interface).
 
#5 Posted : Sunday, September 9, 2007 3:41:52 PM(UTC)
djohnson

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thank you, but the main problem with this is that the filter only retrieves the data during playback.

my desired scenario is to provide a waveform representation before the audio is played.

any ideas?
 
#6 Posted : Monday, September 10, 2007 5:17:45 AM(UTC)
jkottler

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Edit: OK. Got it.
I can post the answer for inserting / displaying the UI dialog for filters in another thread to keep from cluttering up this one. This started on topic with similar questions about VU / volume filters, but has diverged.
 
#7 Posted : Tuesday, September 11, 2007 2:04:03 AM(UTC)

Adnan Ismail  
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If you
want to draw a wave that represents the actual data, you must parse the data first.


If you
don't want to do that in an ltmmPlay control, you can do it in an ltmmConvert
control. Since you don't want to convert the source file to something else, you
can simply tell Windows to throw away the conversion result by setting it like this:






ltmmConvertCtrl1.TargetFile = "nul"
The "nul" is a Windows dummy device that discards any data sent to it.

 
#8 Posted : Thursday, September 20, 2007 3:12:05 PM(UTC)
djohnson

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that works perfect.
thanks for the help!
 
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