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Album Sound Check - The GUI

A while ago you'll recall that I wrote a little Python script that would average out the sound check gain adjustment created by iTunes for a given set of songs.

I've gone a step farther and created a simple GUI tool for doing the same.

Album Sound Check (download link) provides a basic interface to editing this field based on the values in a given set of files.

Sound Check GUI

After running the program go ahead and open a directory containing songs from your iTunes library. They will be scanned in and the gain dB adjustment values stored. ASC will then determine an average from this.

You can choose to not have certain songs affect the resulting average by unchecking the "Use" column. You can choose to not have the computed average applied to a given file by unchecking the "Apply" column.

Once you're ready just click "Apply" and ...

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Permalink | Posted: Apr 22, 2009 | Tags: python osx music pyobjc

Album Based Soundcheck

iTunes supports a feature called Sound Check. Similar to ReplyGain in other players, the goal is make songs playback at a similar volume. This is particularly useful with mixes, songs from various albums do not have jarring transitions. Since this computed on a song-by-song basis, different songs on a single album get different values. In some cases this creates a jarring experience while listening*.

For example: Muse's Absolution has an introduction track that never gets terribly loud, but leads in directly to a normal song. Sound Check did the following:

The ending of the first track is meant to be the same volume as the beginning of the second, but because of Sound Check, this doesn't happen.

I have written album_soundcheck.py which computes the average volume of m4a or mp3 files and replaces the iTunes information ...

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Permalink | Posted: Jan 15, 2009 | Tags: python osx music

Building Cocoa GUIs in Python with PyObjC, Part Six

Handling Images

Cocoa provides an easy interface for dealing with images, NSImage. It can be a bit tricky in Python, but once you get it right the first time, it is fairly easy. For our application we have the images stored inside the audio tags and need to populate an NSImage object from binary data stored as a Python byte-string.

There are a number of methods for initializing an NSImage object from various sources. A few of note:

initWithContentsofFile:
initWithData:
initWithPasteboard:

All of these are worth reading about in the developer documentation. We will be using initWithData:. This accepts a NSData object to make the NSImage. This is a multiple step process, so we'll create a method to make things easier:

def buildNSImage(bytes):
    data = NSData.dataWithBytes_length_(bytes, len(bytes))
    return NSImage.alloc().initWithData_(data)

bytes is a Python byte-string containing the image. NSImage will automatically handle the formatting ...

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Permalink | Posted: Dec 25, 2008 | Tags: python osx programming pyobjc cocoa

Building Cocoa GUIs in Python with PyObjC, Part Five

Adding Python Modules to the Bundle

If you try to use Python modules on the standard OS X Python path import statements will work fine. However, if you have non-standard modules that might be in a different location, or ones that you want to ship with, you will notice you can't just import them.

To bring them into the application bundle you'll have to go through a couple steps, but when it is all done the application will be able to use the modules, and you don't have to require the end user to install anything extra.

  1. Add the files to the Xcode project.

    • Select 'Project -> Add to Project' (option-command-a)
    • Select the Python module (directory) that you want to add.
    • On the next screen select "Copy items into destination group's folder (if needed) Add to Project dialog
    • Select the correct targets in 'Add to Targets'
    • Select "Create Folder References for ...

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Permalink | Posted: Sep 29, 2008 | Tags: python osx programming pyobjc cocoa

Key-Value Coding in PyObjC

So when doing GUIs in with PyObjC you'll realize that the IBOutlet for tying objects to variables have a few limitations. The one I hit was that a single outlet can only be connected to one object. So I read up on Key-value coding. So to do this you have to add two functions per variable:

def name(self):
     return self.var
def setName(self, x):
     self.var = x

You can imagine that this becomes tedious really fast. Luckily there is a solution. As an example:

from PyObjCTools.KeyValueCoding import kvc

class controller(NSWindowController, kvc):
    title = ""
    artist = ""
    album = ""

So this ties __getattr__ and __setattr__ to valueForKey: and setValue:forKey. Making every class variable available for Key-value coding. Very handy.

Permalink | 1 comment | Posted: Sep 10, 2008 | Tags: python pyobjc cocoa

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