In my case Chrome records audio at 96kHz and Firefox at 44.1kHz, that makes huge WAV files. I implemented a downsampling function inside recorderWorker.js where you can select the sample ratio you want, like 16000. function downsampleBuffer(buffer, rate) { if (rate == sampleRate) { return buffer; } if (rate > sampleRate) { throw “downsampling rate … Read more
Assuming that you are talking about Windows, there are essentially three ways to do this. The first is to open the audio device’s main output as a recording source. This is only possible when the driver supports it, although most do these days. Common names for the virtual device are “What You Hear” or “Wave … Read more
If your requirement is while it is recording it should play(means looping back audio), In your while loop thread, you are storing the recorded data (audioData bufer), there itself you can copy it to player object with in the while loop (player.write(audioData, 0, numShortsRead);). You said like your UI thread is stuck, it might be … Read more
To record and play back audio in (almost) real time you can start a separate thread and use an AudioRecord and an AudioTrack. Just be careful with feedback. If the speakers are turned up loud enough on your device, the feedback can get pretty nasty pretty fast. /* * Thread to manage live recording/playback of … Read more
You can get a use from AVFoundation framework. It has AVAudioPlayer to play audio files and AVAudioRecorder to record. You have to bear in mind that Recorder will record with the use of mic only. So with the simultameously playing a audio file and recording it depends on how the mic will perceive the audio … Read more
You might wanna have a look at HTML Media Capture and its API. Ericsson labs already achieved this, see: here (Note: Note that the device element and the related APIs are not available in any browser yet, and the APIs may change before this happens.) But it gives you a rough idea about how it’s … Read more
As a follow up to Nick Fortescue’s answer, here’s a more complete example of how to record from the microphone and process the resulting data: from sys import byteorder from array import array from struct import pack import pyaudio import wave THRESHOLD = 500 CHUNK_SIZE = 1024 FORMAT = pyaudio.paInt16 RATE = 44100 def is_silent(snd_data): … Read more
Here you go. Complete working example. Tweak should be loaded in mediaserverd daemon. It will record every phone call in /var/mobile/Media/DCIM/result.m4a. Audio file has two channels. Left is microphone, right is speaker. On iPhone 4S call is recorded only when the speaker is turned on. On iPhone 5, 5C and 5S call is recorded either … Read more
There is a fairly complete recording demo available at: http://webaudiodemos.appspot.com/AudioRecorder/index.html It allows you to record audio in the browser, then gives you the option to export and download what you’ve recorded. You can view the source of that page to find links to the javascript, but to summarize, there’s a Recorder object that contains an … Read more