How can I receive http audio streams in Matlab?

Question

Richard Keniuk 2019-7-24

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编辑： Massimo Serafini 2023-5-26

I used to put the URL (ex: http://192.168.1.23:8000/stream.m3u) for the audio stream into Simulink Multimedia File Reader "File Name" parameter but this no longer functions. Is there a new way of getting streaming audio into a Simulink model? Is there a function that allows me to receive http streams in a Matlab script?

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Richard Keniuk 2023-5-26

Interesting test.

On Mac, Matlab R2021a playing a FLAC or WAV file from my local drive will read on the dsp.AudioFileReader, but MP3 and M4A will not (fails as "unsupported file"). Streaming from the web, FLAC, MP3, AAC, or OPUS streams will not play at all. Doesn't seem like dsp.AudioFileReader is very useful on Mac.

On Windows, Matlab R2021a plays FLAC, WAV, MP3, and M4A files that were tested. Streaming only works on MP3 format streams.

Massimo Serafini 2023-5-26

编辑：Massimo Serafini 2023-5-26

在 MATLAB Online 中打开

I'm trying to receive multiple HTTP streams to mix them in a multichannel output. Like:

fileName1 = "live Stream 1"
afr1 = dsp.AudioFileReader(fileName1);
fileName2 = "live Stream 2"
afr2 = dsp.AudioFileReader(fileName2);
adw = audioDeviceWriter('SampleRate', 48000,...
    'Driver','ASIO',...
    'Device','default',...
    'BufferSize', 32,...
    'BitDepth','24-bit integer',...
    'ChannelMappingSource', 'property',...
    'ChannelMapping',1:4);
setup(adw ,zeros(afr1.SamplesPerFrame,4))
tic
while ~isDone(afr) && toc<60
    audio = [afr1() afr2()];
    adw(audio);
end
release(afr1);
release(afr2);
release(adw);

and this works fine, just a a bit slow before it starts playing. Anyway, if I try to add more streams the script becomes unresponsive, and it exits reporting this:

Error using AudioFileReader

Could not add the data source to the filter graph.

I've tried to pin pot the problem, and my last guess is in that the several http requests create a too long packets waiting.

Do you have any suggestion on this issue?

Thanks

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Answer 1

Urmila Rajpurohith 2019-8-5

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Assuming you need to Process Audio file in your Simulink model:

The “From Multimedia File” block accepts the audio files which have extensions such as

.wav, .wma, .avi, .aif, .aifc, .aiff, .mp3, .au, .snd, .mp4, .m4a, .flac, .ogg

So if you need to access web based data use following function in MATLAB

webread(url)

And then you can access the data in Simulink using “From Workspace” block and can process it further.

You can refer to below documentation link for more details on how to use “webread” function.

https://www.mathworks.com/help/matlab/ref/webread.html

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Answer 2

Richard Keniuk 2019-8-26

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编辑：Richard Keniuk 2019-8-26

Thanks for the input Urmila,

Looks like webread will only work for file with a fixed filesize download (picture, web page data, image). I am trying to receive live a live audio stream which has no end. Maybe I am missing something here. I am using this URL for a test: "http://70.38.12.44:8100/stream"