d-audio | : musical_note : 简洁的音乐播放器插件，重写了代码更方便使用 | Style Language library

I am trying to record audio and process it afterwards. As I understand there is no unified API I could use to access microphone across different platforms. I am aiming at WASM, UWP and Android.

My approach is to record audio with platform-specific code.

For UWP I can use MediaCapture class as described here: link. I have implemented this part and it's working just fine.

For Android it should be straight forward as well. I can use Android.Media.MediaRecorder as shown here: link. I am not sure how to get the recorded audio file afterwards.

As for WASM I am completely lost here. I suppose I could use some javascript library to record the sound or vmsg library as described here link. But I have no idea how to get the recorded data into C# code for further processing.

Is there some material I should read to better understand the topic. Do I overlook some important details? Or is there an easy way how to record audio in xamarin.android and wasm?

UPDATE: I have successfully implemented audio capture on Android using Android.Media.MediaRecorder and I can simply access the file after I am finished recording.

I'm currently trying to write a script to display spectrograms of (multichannel) audio in Bokeh. Since I am doing some processing on the audio, I can't easily save them as files on the computer, so I'm trying to remain in Python.

The idea is to create a plot where each column corresponds to an audio sample, and each row corresponds to a channel.

Now I want to be able to listen to the corresponding audio when clicking on a subplot. I've managed to do the non-interactive part of displaying the spectrograms, written a callback to play audio, and applied it to each callback.

Here is a minimal working example of the code:

I 've been trying to create a "communication wire" from my Raspberry Pi microphone (usb headsets) to my soundcard in order for the script to send whatever I say at microphone to my speakers through a pipeline.

Problem:

When i run the script below, the mic works and sends voice at my speakers for a couple of seconds. After that it stops repeating what i am saying.

The code i have is shown below:

I have tried few iOS examples, but they seems not working for SwiftUI, for example https://medium.com/@quangtqag/background-audio-player-sync-control-center-516243c2cdd1

How can display control buttons and media info on locked screen in SwiftUI framework?

UPD: Adding example

I am using Angular for development of a video conferencing web application. I am trying to call some wasm functions in my AudioWorkletProcessor class. However, I am quite stuck on how to pass the wasm module into the AudioWorkletProcessor and then call those functions. I was able to instantiate the wasm module from the js file generated from emcc (using command: emcc test.cpp -s WASM=1 -s MODULARIZE=1) and then tried passing this module through the options.processorOptions parameter when we construct the AudioWorkletNode; however, it seems like Function objects cannot be passed as it gives a DataCloneError. Is there a better way of instantiating the wasm module and passing it into the worklet processor so that I can use its functions?

Code of audio.service.ts:

I am currently using Angular to build a video conferencing application. In one of my services, I try to incorporate the web audio api. The problem is when I try to add a script to the audio worklet using the addModule(AudioWorkletProcessorFileName.js) function, it throws a SyntaxError: Unexpected Identifier. I have found that it only happens when I try to import another file into AudioWorkletProcessorFileName.js. When I remove the import statement, everything works fine. There is more complex code that I want to import, but I wanted to start off with a more simple version of test.js (the file I want to import). I am not sure why this is the case. Am I missing some configuration settings in Angular or something else?

In audio.service.ts:

I have a Grabby Terratec USB card.

I want to embed an mp4 video (with H.264 codec) into a pdf with Latex, using the media9 package. There are no error messages during compilation. Before activating the video in the pdf, there is a still image (as intended), but after activation, there is just a black window, without the video being played properly.

A minimal example to illustrate is given below. It is a shortened version of an Overleaf template for embedding mp4 files into pdf documents with Latex. I have attached the still image penguins.jpg to this question, but I cannot (or don't know how to) attach the video penguinschasingbutterfly.mp4 in stackoverflow.

I've had some trouble with sound for a few weeks already, it just doesn't produce any output on my system. I've tried submitting a bug report, but there is no answer from launchpad, the bug importance is undecided and it is not assigned to anyone. I have used Ubuntu 18.04 before and had no trouble with sound.

So, I've decided to reinstall Ubuntu in hope that the issue gets fixed, but that did not happen. I would really want to solve the problem, but I don't know how. I've looked up a lot of things and tried them, but nothing works...

Things I've tried:

• Playing around with alsamixer
• Playing around with pavucontrol and pulseaudio
• Reinstalling alsa and pulseaudio
• Doing alsa force-reload
• Adding options snd-hda-intel dmic_detect=0 to /etc/modprobe.d/alsa-base.conf
• Adding blacklist snd_soc_skl to /etc/modprobe.d/blacklist.conf

I kindly ask for help.

I am posting relevant outputs below:

$ sudo lshw -C sound