Is there a way to get the length of an audio file in seconds, from the file name?

I'm hoping to make audio cues in my cutscene editor show up on the timeline with their actual length shown, to make sound and action easier to synchronize...

if you load the audio file with "snd_create" that's possible through snd_buffer afaik

if you don't want to load it (to save memory), you can read it from the file header (for wave files at least)

That sounds like it would work- since I mostly planned for it to just use .WAV's

How do I go about reading a wave file header?

well that's not really easy, there are several chunks in the header, and the number of these chunks also may vary from file to file. Then you have to get the wave data length, the sample rate, the bit rate and the number of channels...

I've built a small sample prog, that uses a c++ library (easier to code that difficult stuff imho), which offers such a function :

http://www.matthias-auer.net/Projects/WaveFileSize/WaveFileSize.zip

in that zip, there is a lite-c script, the dll (plus it's source (visual studio 2010)) and a small wave file

i only tested the dll with some samples, but it should work, if the dll isn't able to open the file or something it returns -2 or -1 !