Change CurrentSample in audioplayer

2016 11 7
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回答已采纳
更新时间：2018 3 15
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I want to be able to allow a user to select a point in a track and begin playing, so I have a ButtonDownFcn set on an axes to take the coordinates clicked and convert this to a sample number to resume playing a plotted audio clip.
% Get the x coordinate
c = get(hObject, 'CurrentPoint');
x = c(1,1);
% Multiply this by the sample rate (x axis represents seconds)
% to get the sample at which the track should resume
smpl = x * get(player, 'SampleRate');
set(player, 'CurrentSample', smpl);
The issue I'm having is that I then get an error message that says Error using audioplayer/set You cannot set the read-only property 'CurrentSample' of audioplayer.
So obviously this isn't the correct way to skip to a new point in a track. What is the correct way to do this?

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 采纳的回答

Walter Roberson
Walter Roberson 2016-11-7

0 个投票

The correct way is to delete the audioplayer and create a new one whose samples start with the appropriate sample.
Alternately, you can use https://www.mathworks.com/help/dsp/ref/audiodevicewriter-class.html or https://www.mathworks.com/help/dsp/ref/audiodevicewriter-class.html

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Ryan Sinfield
Ryan Sinfield 2016-11-7
Ok - is there a way to get the audio data from the audioplayer object. Similar to using getaudiodata() from an audiorecorder?
Walter Roberson
Walter Roberson 2016-11-7
player_struct = struct(YourAudioPlayerObject);
player_struct.AudioData
Though I just realized another way:
You can
stop(YourAudioPlayerObject)
play(YourAUdioPlayerObject, NewStartingSampleNumber)
Ryan Sinfield
Ryan Sinfield 2016-11-8
Cool I'll give that a try a little later on. Thanks!
Ryan Sinfield
Ryan Sinfield 2016-11-9
That works great, thanks

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