How to use 2 datacursors to dynamically change audio files in GUI's?

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Mayank Amencherla 2013-12-31

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评论： Walter Roberson 2014-1-1

In my GUI, I have loaded an audio file ( .wav ) into the variable storedStructure, and saved it in the handles structure - handles.str1

Now, i would like to use 2 data cursors to dynamically alter the audio playing length. For example, if the length of the audio is 5 seconds, if I were to choose 2 cursors at 2 seconds and 4 seconds, it would play only that part of the audio.

I need to put this code right away in my .m file for my GUI.

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Walter Roberson 2013-12-31

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编辑：Walter Roberson 2013-12-31

Is there a reason why you need to use data cursors instead of (for example) ginput() ?

What is the data cursor to be applied against? Data cursors require a graph, but you have not indicated anything as being graphed. Are you graphing the signal level, or are you graphing the time?

Why not use a couple of sliders?

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Walter Roberson 2014-1-1

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If you are going to put it into your slider callback, replace handles.slider1 with hObject

However, I would not put it in the slider callback. The slider callback often gets called multiple times while you are moving it longer distances or fine-tuning it. You should adjust the position and then have something else to trigger starting the playing and plotting.

The error message is indicating that you have either deleted the slider that handles.slider1 referred to, or you never initialized it to a valid slider handle. You might have deleted the slider if your code creates the slider with an explicit uicontrol() call, rather than having the slider created and stored with the .fig .

Note for clarity: once you move the action outside the slider callback, you would not use hObject to refer to the slider; instead you would track down why handles.slider1 was not correct and fix that problem so that handles.slider1 can be used in the place you initiate the plotting and playing.

If you need to, you could use

handles.slider1 = findall(0, 'Tag', 'slider1');