waveform

I know there are some similar questions here, but most of them are concerning generating waveform images , which is not what I want. My goal is to generate a waveform visualization for an audio file, similar to SoundCloud, but not an image. I'd like to have the max amplitude data for each second (or half second) of an audio clip in an array. I could then use this data to create a CSS-based visualization. Ideally I'd like to get an array that has all the amplitude values for each second as a percentage of the maximum amplitude of the entire audio file. Here's an example: [ 0.0, # Relative max

I've looked around Stack Overflow for an answer to this, but nowhere seems to give the correct answer or direction... My project will allow a user to upload a WAV, which ultimately will be converted to a low quality MP3 using FFmpeg on the server and it'll all be stored and served on Amazon S3. The next obstacle is working out how to extract a reliable waveform visualisation from this uploaded sound. I'm using Python and Django on Linux Ubuntu 10 on a VPS for this project... I'm, at the vert least, needing some sort of direction... I'm at a lost of where to start to look for such a tool? This

I am making one music application in android.In this music list coming from server side. I don'tknow how to show waveform of audio in android ? like in soundcloud website. I have attached image below. Perhaps, you can implements this feature without libraries, of course if you want only visualisation of audio sample. For example: public class PlayerVisualizerView extends View { /** * constant value for Height of the bar */ public static final int VISUALIZER_HEIGHT = 28; /** * bytes array converted from file. */ private byte[] bytes; /** * Percentage of audio sample scale * Should updated

How can I play a sound based on waveform data that my .NET program is generating from user input and mathematical functions? By "waveform data" I mean SPL (sound pressure level) values in a fixed interval time-series (probably 44.1 kHz). I presume that this requires some kind of streaming buffer arrangement. Note, that this has to be live/real-time, so just creating a .wav file and then playing that will not be sufficient. VB.NET is preferred, but C# is acceptable also. Just to clarify: What I am looking for is a simple working code example. You can do this using NAudio . You create a stream

I'm looking for how to draw the sound waves according to music. I want waves like this image here is some discussion about displaying Waves from music WaveForm on IOS rendering a waveform on an iphone audio waveform visualisation with iPhone Github Example Links https://github.com/gyetvan-andras/cocoa-waveform https://github.com/benalavi/waveform https://github.com/JingWZ/WaveView https://github.com/gyetvan-andras/cocoa-waveform https://github.com/ioslovers/ATTabandHoldAudioRecord https://github.com/hezone/ECGWavesPlayer https://github.com/iluvcapra/JHWaveform But not getting any idea about

Yesterday I finalised the code for detecting the audio energy of a track displayed over time, which I will eventually use as part of my audio thumbnailing project. However I would also like a method that can detect the pitch of a track displayed over time, so I have 2 options from which to base my research upon. [y, fs, nb] = wavread('Three.wav'); %# Load the signal into variable y frameWidth = 441; %# 10 msec numSamples = length(y); %# Number of samples in y numFrames = floor(numSamples/frameWidth); %# Number of full frames in y energy = zeros(1,numFrames); %# Initialize energy for frame = 1

I am tying to achieve sine wave gradually changing from 8Hz to 2Hz over 5 seconds: This waveform was produced in Cool Edit . I gave it a start frequency of 8Hz , an end frequency of 2Hz and a duration of 5 seconds. The sine wave gradually changes from one frequency to the other over the given time. My question is, how can I accurately find the start time of each cycle (highlighted with a red dot), using a FOR loop? Pseudo code: time = 5 //Duration freq1 = 8 //Start frequency freq2 = 2 //End frequency cycles = ( (freq1 + freq2) / 2 ) * time //Total number of cycles for(i = 0; i < cycles; i++) {

I have a long string of hexadecimal values that all looks similar to this: '\x00\x00\x00\x01\x00\x00\x00\xff\xff\x00\x00' The actual string is 1024 frames of a waveform. I want to convert these hexadecimal values to a list of integer values, such as: [0, 0, 0, 1, 0, 0, 0, 255, 255, 0, 0] How do I convert these hex values to ints? You can use ord() in combination with map() : >>> s = '\x00\x00\x00\x01\x00\x00\x00\xff\xff\x00\x00' >>> map(ord, s) [0, 0, 0, 1, 0, 0, 0, 255, 255, 0, 0] use struct.unpack : >>> import struct >>> s = '\x00\x00\x00\x01\x00\x00\x00\xff\xff\x00\x00' >>> struct.unpack(