Write wav file python

Posted on 05.04.2021 Comments

Released: Jul 14, A Python module for reading and writing WAV files using numpy arrays. View statistics for this project via Libraries. Tags wav, numpy. When floating point data is passed to wavio. The functions can read and write 8-,and bit integer WAV files. The package has a suite of unit tests, but it should still be considered prototype-quality software. There may be backwards-incompatible API changes between releases. The following code also found in the docstring of wavio. Jul 14, Dec 6, Dec 4, Download the file for your platform.

If you're not sure which to choose, learn more about installing packages. Warning Some features may not work without JavaScript. Please try enabling it if you encounter problems. Search PyPI Search. Latest version Released: Jul 14, Navigation Project description Release history Download files. Project links Homepage. Maintainers WarrenWeckesser.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The following code writes a simple sine at frequency Hz to a mono WAV file. How should this code be changed in order to produce a stereo WAV file. The second channel should be in a different frequency.

IOW, corresponding frames for the two channels "alternate" in the file. See e. Multi-channel digital audio samples are stored as interlaced wave data which simply means that the audio samples of a multi-channel such as stereo and surround wave file are stored by cycling through the audio samples for each channel before advancing to the next sample time.

This is done so that the audio files can be played or streamed before the entire file can be read. This is handy when playing a large file from disk that may not completely fit into memory or streaming a file over the Internet.

write wav file python

The values in the diagram below would be stored in a Wave file in the order they are listed in the Value column top to bottom. For an example producing a stereo. The test produces an all-zero file. You can modify by inserting alternating sample values. Learn more. How to write stereo wav files in Python?

Ask Question. Asked 9 years, 7 months ago. Active 7 years, 1 month ago. Viewed 16k times. Jonathan Jonathan Active Oldest Votes. Alex Martelli Alex Martelli k gold badges silver badges bronze badges. The link to the reference is dead. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

The Overflow Blog. Podcast Programming tutorials can be a real drag.The wave module provides a convenient interface to the WAV sound format. The wave module defines the following function and exception:.

If file is a string, open the file by that name, otherwise treat it as a file-like object. If mode is omitted and a file-like object is passed as filefile. The open function may be used in a with statement.

Changed in version 3. A synonym for openmaintained for backwards compatibility.

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Deprecated since version 3. An error raised when something is impossible because it violates the WAV specification or hits an implementation deficiency. Close the stream if it was opened by waveand make the instance unusable. This is called automatically on object collection.

Returns number of audio channels 1 for mono, 2 for stereo. Returns compression type 'NONE' is the only supported type. Human-readable version of getcomptype.

Read and write WAV files using Python (wave)

Usually 'not compressed' parallels 'NONE'. Reads and returns at most n frames of audio, as a bytes object. For seekable output streams, the wave header will automatically be updated to reflect the number of frames actually written. For unseekable streams, the nframes value must be accurate when the first frame data is written. An accurate nframes value can be achieved either by calling setnframes or setparams with the number of frames that will be written before close is called and then using writeframesraw to write the frame data, or by calling writeframes with all of the frame data to be written.

In the latter case writeframes will calculate the number of frames in the data and set nframes accordingly before writing the frame data.

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Make sure nframes is correct, and close the file if it was opened by wave. This method is called upon object collection. It will raise an exception if the output stream is not seekable and nframes does not match the number of frames actually written. Set the number of frames to n. This will be changed later if the number of frames actually written is different this update attempt will raise an error if the output stream is not seekable. Set the compression type and description.

At the moment, only compression type NONE is supported, meaning no compression. Sets all parameters. Write audio frames and make sure nframes is correct.

It will raise an error if the output stream is not seekable and the total number of frames that have been written after data has been written does not match the previously set value for nframes.

wavio 0.0.4

Note that it is invalid to set any parameters after calling writeframes or writeframesrawand any attempt to do so will raise wave. The wave module defines the following function and exception: wave. The Python Software Foundation is a non-profit corporation. Please donate. Last updated on Apr 08, Found a bug?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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write wav file python

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to generate a bit WAV-format audio file using Python 2. I can't use scipy. The documentation for Python's own wave module doesn't specify what format of data it takes. The file wavio. The only dependency of wavio is numpy; wavio uses the standard library wave to deal with the WAV file format.

Python can only pack integers in 2 and 4 bite sizes. I already submitted an answer to this question 2 years ago, where I recommended scikits. In the meantime, the situation has changed and now there is a library available which is much easier to use and much easier to install, it even comes with its own copy of the libsndfile library for Windows and OSX on Linux it's easy to install anyway : PySoundFile!

The following code does the trick:. You should try scikits. Learn more. Ask Question. Asked 6 years, 10 months ago. Active 1 year, 2 months ago.

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Viewed 8k times. So is it possible to do this in Python? Active Oldest Votes. Warren Weckesser Warren Weckesser Roland Smith Roland Smith What should I give to the writeframes function? The question is about how to write the frames, yet no writeframes examples. Matthias Matthias 2, 1 1 gold badge 21 21 silver badges 37 37 bronze badges. Hmm, tricky. In my experience, it's fairly standard practice to just scale.

Technically, every value is also being floored. The ideal conversion to integer would include rounding as well. Note that there is currently audiolab version 0. I only just discovered how truly awful it is to try to install this on Windows. Changing answer to wavio. What do you think about that?

I'll give it a shot! Sorry, I wasn't having a go at youI just had two days of frustration and dependency hell.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The wav file opens and plays in Windows Media Player, so at least its the proper format.

However, when opening it with Audacity and looking at the individual samples, they're all 0, and concordantly the file plays no sound at all. What I don't understand is how that numpy array listed above becomes all 0's.

It should be below the maximum value for a sample or above, if it's negative.

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I found that scipy. While I couldn't find a way to change this in wavfile. As you discovered by printing out the output at different points and re-saving what you originally loaded, the line data2.

In creating wav files through scipy. Definitely have to be careful about the amplitude when creating wave files, but it's not clear to me right now what the maximum level is before it starts clipping or disappearing.

write wav file python

Learn more. Writing wav file in Python with wavfile. Asked 6 years, 7 months ago. Active 5 years, 11 months ago. Viewed 26k times. I have this code: import numpy as np import scipy. It returns the same thing as it printed before writing. I want to see what that data looks like. It prints this [[-1 2] [-3 4] [-4 3] Active Oldest Votes.

This fixed my issue as well. I suspect that is too large of an amplitude. Try 1. Mike Vella Mike Vella 7, 8 8 gold badges 49 49 silver badges 71 71 bronze badges.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It is reading properly, because if I write print data[i] instead I get usually non-zero arrays of size 2. The array data returned by wavfile. The data type of a numpy array can not be changed in place, so this line:.

From your additional comments, it appears that you want to take the sine of each value and write out the result as a new wav file. Here is an example that I think does what you want. I'll use the file 'M1F1-intAFsp. If you are using an interactive shell, you can use it to inspect the variables and their attributes. Here's the output. The initial warning means there is perhaps some metadata in the file that is not understood by scipy.

Learn more. How to manipulate wav file data in Python? Ask Question. Asked 6 years, 7 months ago. Active 2 years, 8 months ago. Viewed 36k times. I'm trying to read a wav file, then manipulate its contents, sample by sample Here's what I have so far: import scipy. Active Oldest Votes.

write wav file python

Instead of that line, create a new floating point array to store your computed result. Or use numpy. The np. WavFileWarning Array 'data' shape:2 dtype: int16 min, max: Array 'sindata' shape:2 dtype: float32 min, max: Warren Weckesser Warren Weckesser That's definitely the way to go, and it'll be way faster.

Jamil, I think you'll want to familiarize yourself with the basics of numpy arrays e. Without seeing what you did, I can't solve that problem. I was just looking in to them. I suppose I need to convert a list to a numpy array. What I did was this: for i in range len data : data2. Jamil: I've updated my answer. Note that there are no python loops in my code. All the numpy operations are vectorized.

You'll learn more about that if you work through one of the numpy tutorials. Sign up or log in Sign up using Google.The wave module provides a convenient interface to the WAV sound format. The wave module defines the following function and exception:. If file is a string, open the file by that name, otherwise treat it as a seekable file-like object.

If mode is omitted and a file-like object is passed as filefile. A synonym for openmaintained for backwards compatibility. An error raised when something is impossible because it violates the WAV specification or hits an implementation deficiency. Close the stream if it was opened by waveand make the instance unusable.

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This is called automatically on object collection. Returns number of audio channels 1 for mono, 2 for stereo.

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Returns compression type 'NONE' is the only supported type. Human-readable version of getcomptype. Usually 'not compressed' parallels 'NONE'. Make sure nframes is correct, and close the file if it was opened by wave. This method is called upon object collection. Changed in version 3. Set the compression type and description. At the moment, only compression type NONE is supported, meaning no compression.

Sets all parameters. Note that it is invalid to set any parameters after calling writeframes or writeframesrawand any attempt to do so will raise wave.

Enter search terms or a module, class or function name. The wave module defines the following function and exception: wave. This will be changed later if more frames are written. Table Of Contents The Python Software Foundation is a non-profit corporation.