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

5 vues (au cours des 30 derniers jours)
Jerry Gregoire
Jerry Gregoire le 22 Mar 2013
Commenté : Walter Roberson le 22 Juil 2022
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?

Réponses (4)

Wayne King
Wayne King le 22 Mar 2013
Modifié(e) : Wayne King le 22 Mar 2013
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 commentaire
Jerry Gregoire
Jerry Gregoire le 25 Mar 2013
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 le 22 Mar 2013
Modifié(e) : Matt Tearle le 22 Mar 2013
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 commentaires
Jerry Gregoire
Jerry Gregoire le 25 Mar 2013
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 le 25 Mar 2013
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 le 27 Mar 2013
Modifié(e) : Sean de Wolski le 27 Mar 2013
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 le 18 Juin 2020
Modifié(e) : Peter Urlings le 18 Juin 2020
To retrieve the data from an audioplayer object use:
s=struct(AudObj)
SoundDataPullout = s.AudioData;
  2 commentaires
Petros Oratiou
Petros Oratiou le 22 Juil 2022
Does this mean that making a struct copy of an object will ignore all restrictions?
Walter Roberson
Walter Roberson le 22 Juil 2022
Yes, using struct() can violate access restrictions.

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