The goal of my alarm clock website was to actually be my alarm clock. For this to happen, I thought I would need to have my computer running all night long which seemed like a waste of electricity. It turns out, you can schedule your computer to wake up at a certain time by using the task scheduler.

So now I have it wake the computer up at 7:50 so that in 5 minutes it can play the nightingales before playing the Good Morning Dub. One issue though is that Windows will go back to sleep in 2 minutes. You can modify that using a registry key so that it will have enough time to play the music.

Now while the alarm clock website is accomplishing the task of waking me up at the right time, it doesn’t do a very good job of keeping me awake. Maybe I need to make an interactive component to shut off the alarm

A few weeks ago, I wanted to do some C++ Mozilla coding to make sure I wasn’t going soft. But I didn’t really know what to do. I left it for a bit until I found something weird about the HTML5 spec – there was a method of testing whether metadata has been loaded, but no way to expose the metadata (eg. song title, artist, album, etc) to the user such as through page info.

I think this will be useful. As media starts being embedded into the web browser, it would make sense to start exposing this to the user. I know there have been a few instances where I was listening to something on the radio, but there was little hint of what the song was called (I usually tried to remember a few lyrics and did a Google search. Mixed success).

I brought this up in the whatwg irc channel, and apparently this is being considered for the next version of the spec. Which is understandable, because the server can always display the metadata. But often, media may not be central to the website. For example, background music.

I started look at the Audio/Video backend stuff that moz uses. It got confusing real quick (it doesn’t help that the audio code itself is completely empty). Plus I was in a hurry. So I decided to implement it as an extension.

It was a lovely experience. I had a few problems, including finding out that audio/video wasn’t actually being saved to the cache (bug 469446). It was checked-in like 2 days after I found it out. Also, I hate string very much. The string guide helped, but it is still awful. And I made firefox crash a few times because I’m a nsCOMPtr n00b.

Right now, this extension is working only with ogg vorbis files. Which is stupid because <audio /> is rarely used anywhere, and if it is used, only with certain conditions (wikimedia commons uses the audio tag, but not really. Apparently, the video/audio tags start automatically downloading the media even if it isn’t under autoplay. This is a mess if you have dozens of audio tags in one page. bug 464272). It is so rarely used, that I had to create a audio demo page for testing purposes.

Using it is very simple. Right-clicking on a audio tag brings up the context menu. I decided to use the context menu over Page Info because the media tab of the Page info dialog is very much geared towards images, and that code has to be changed in the firefox source (it’s not easy/pretty to overlay).

Which brings up the audio’s metadata

While a lot of metadata is displayed, some isn’t. For example, iTunes has support for cover art as a COVERART header. While you can put that in vorbis, it should be noted that it isn’t widely supported. So I decided to put in only the standard headers for now.

This is dealing with C++ code. Which is much more dangerous than javascript code because NS_ERROR_OMGWTF doesn’t appear in your error console when I try to free an uninitialized pointer. I made basic checks so hopefully nothing bad will happen. But I didn’t do extensive checking in case we have a bad ogg file or something.

Well, to be fair to me, I always save the function’s return value. I just didn’t check whether it passed nor did anything about it. And this won’t just crash at any time. It’ll crash if you try to load the metadata (I’m very nice like that).

The name of the extension is saraswati, named after the hindu God of music and knowledge (really, a Google search helped out a lot here). Please enjoy! (Linux x86, x86-64 and Windows x86 only right now)