How to to design and test UI with audioDeviceWriter and dsp.AudioFileReader in AppDesigner for multichannel audio playback

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Michael 2023-10-4

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https://ww2.mathworks.cn/matlabcentral/answers/2029184-how-to-to-design-and-test-ui-with-audiodevicewriter-and-dsp-audiofilereader-in-appdesigner-for-multi

评论： Michael 2023-10-5

I'm developing a user interface in AppDesigner that uses dsp.AudioFileReader and audioDeviceWriter to read and play 16-channel audio files. I don't have immediate access to the final 16-channel hardware interface and loudspeaker setup that will be used (it will use RME Madiface XT I guess with ASIO driver), but I do have example 16-channel wav files to work with.

I have the UI working well with mono files over a simple 2-channel home setup using a WASAPI driver. As soon as I've tried playing back the 16-channel files, I get the error message:

Error using audioDeviceWriter/setup

PortAudio Error: Invalid number of channels

(I've been using the setup call to initialise the audioDeviceWriter object, as per the example https://uk.mathworks.com/help/audio/ref/audiodevicewriter-system-object.html)

Is it possible to use these MATLAB objects with the 16-channel files in a limited way over a stereo device (for example, with only playing back 2 of the 16 channels), to enable development and debugging to continue, before undertaking final testing and debugging on the full 16-channel system?

What settings should I anticipate being needed to get the UI working with the 16-channel hardware that are not needed for playback of mono or stereo files - for example, device-specific settings, channel mapping etc?

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Mario Malic 2023-10-5

在 MATLAB Online 中打开

Check https://uk.mathworks.com/help/audio/ref/audiodevicewriter-system-object.html#mw_55e94279-e244-4a00-abe8-0eb0f61778c6

deviceWriter = audioDeviceWriter('SampleRate',fileInfo.SampleRate);
info(deviceWriter)

info will tell you how many channels does the audioDeviceWriter support.

Each channel corresponds to a column of matrix you are trying to write.

Michael 2023-10-5

Thanks. That is helpful in incorporating a check in the code to see if the selected device can support the number of channels in the file.

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