audio – Page 7 – Tarik Billa

android: Detect sound level

September 9, 2023 by Tarik

Use mRecorder.getMaxAmplitude(); For the analysis of sound without saving all you need is use mRecorder.setOutputFile(“/dev/null”); Here´s an example, I hope this helps public class SoundMeter { private MediaRecorder mRecorder = null; public void start() { if (mRecorder == null) { mRecorder = new MediaRecorder(); mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); mRecorder.setOutputFile(“/dev/null”); mRecorder.prepare(); mRecorder.start(); } } public void stop() … Read more

Open source C# code to present wave form?

September 9, 2023 by Tarik

This is as open source as it gets: public static void DrawNormalizedAudio(ref float[] data, PictureBox pb, Color color) { Bitmap bmp; if (pb.Image == null) { bmp = new Bitmap(pb.Width, pb.Height); } else { bmp = (Bitmap)pb.Image; } int BORDER_WIDTH = 5; int width = bmp.Width – (2 * BORDER_WIDTH); int height = bmp.Height – … Read more

Graphing the pitch (frequency) of a sound

September 8, 2023 by Tarik

Frequency (an objective metric) is not the same as pitch (a subjective quantity). In general, pitch detection is a very tricky problem. Assuming you just want to graph the frequency response for now, you have little choice but to use the FFT, as it is THE method to obtain the frequency response of time-domain data. … Read more

Python extract wav from video file

September 8, 2023 by Tarik

It is a very easy Task using ffmpeg with python subprocess and there is a reason why people are pointing to this solution as a good solution. This is the basic command extracting audio from a given video File: ffmpeg -i test.mp4 -ab 160k -ac 2 -ar 44100 -vn audio.wav The Python Code is just … Read more

iPhone headphone jack – read in data?

September 3, 2023 by Tarik

Yes, it is possible to use the iPhone 3.5 mm (1/8″) headphone/mic jack as a data input, as has been demonstrated by the HiJack project – which also powers the input device. The key, as Dominik Selbold has pointed out, is that the incoming data must be modulated at frequencies within the passband of the … Read more

converting .wav file to .ogg in javascript

September 3, 2023 by Tarik

The Web Audio spec is actually intended to allow exactly this kind of functionality, but is just not close to fulfilling that purpose yet: This specification describes a high-level JavaScript API for processing and synthesizing audio in web applications. The primary paradigm is of an audio routing graph, where a number of AudioNode objects are … Read more

PCM audio amplitude values?

September 2, 2023 by Tarik

Think of the surface of the microphone. When it’s silent, the surface is motionless at position zero. When you talk, that causes the air around your mouth to vibrate. Vibrations are spring like, and have movement in both directions, as in back and forth, or up and down, or in and out. The vibrations in … Read more

Read MP3 in Python 3

August 31, 2023 by Tarik

To make it easier I’d convert with some tools mp3 to wav, either: $ ffmpeg -i foo.mp3 -vn -acodec pcm_s16le -ac 1 -ar 44100 -f wav foo.wav or $ mpg123 -w foo.wav foo.mp3 Then read the WAV with one of the python WAV libraries. I’d recommend PySoundFile because it works with most generated WAV correctly … Read more

How to play an audio file on a voice call in android

August 28, 2023 by Tarik

While this is a old post, thought would share the experience i have so far with trying this.. In the simplest sense, no.. you can not But there are “some” exceptions here, but if your looking to build an application for the public.. This is not for you… its device specific… WHY WE CANT PLAY … Read more

HTML audio can’t set currentTime

August 24, 2023 by Tarik

You need to do something like this (if you use jQuery) $(‘#elem_audio’).bind(‘canplay’, function() { this.currentTime = 10; }); or in Javascript var aud = document.getElementById(“elem_audio”); aud.oncanplay = function() { aud.currentTime = 10; }; The reason behind for this setup is you need to make sure the audio is ready to play.