How do I retreive the data, samples, from a audioplayer object

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Jerry Gregoire
Jerry Gregoire 2013-3-22
评论： Walter Roberson 2022-7-22
How do I retrieve the sample data from an audioplayer object. This seems like an obvious thing to allow, but I cannot find any information on it.
Example: AudObj = audioplayer(SoundData, Fs, N);
Now if I don't have access to SoundData, how can I retrieve it from AudObj?

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回答（4 个）

Wayne King
Wayne King 2013-3-22
编辑：Wayne King 2013-3-22
I'm not sure what you mean by "you don't have access to SoundData"
What is SoundData?
Normally you feed audioplayer, the data vector from the MATLAB workspace.
Like:
load handel;
p = audioplayer(y, Fs);
Or are you passing it a handle from an audiorecorder object?
  1 个评论
Jerry Gregoire
Jerry Gregoire 2013-3-25
By SoundData I mean the samples that were used to create the object, (ie) y. So if I am given the object, I can extract y to do analysis. JG

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Matt Tearle
Matt Tearle 2013-3-22
编辑：Matt Tearle 2013-3-22
This seems like an unnecessarily inelegant hack, but you could always attach SoundData as AudObj's UserData property:
load handel;
player = audioplayer(y, Fs);
player.UserData = y;
clear y
y = player.UserData;
If you edit the audioplayer classdef, it appears that the actual audio data is "locked down" as a private property (called AudioData).
  2 个评论
Jerry Gregoire
Jerry Gregoire 2013-3-25
Yeah, I thought of this. It is inefficient since the object already has the data. If I have to, I will do it this way. It would be nice though to have access to the data if I didn't create the object.
Matt Tearle
Matt Tearle 2013-3-25
I'm not sure it will be that inefficient. MATLAB generally does a lazy copy (just a reference unless the data is modified). Not sure if there's anything about being a private property of the object that changes that behavior.
But, yes, the issue of getting the object from someone/somewhere else is tricky. Not much you can do about that. Maybe you could submit an enhancement request.

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Sean de Wolski
Sean de Wolski 2013-3-27
编辑：Sean de Wolski 2013-3-27
The audioplayer data is stored in a property that has SetAccess and GetAccess attributes set to private
This can be seen by opening the audioplayer class.
I'll put in the enhancement request.
Peter Urlings
Peter Urlings 2020-6-18
编辑：Peter Urlings 2020-6-18
To retrieve the data from an audioplayer object use:
s=struct(AudObj)
SoundDataPullout = s.AudioData;

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