I've been playing around with libsndfile, libvorbisfile, libmodplug, and
libao to provide background music and sound effects for a game engine. I
have a solid handle on making one noise at a time, but I don't understand
mixing. At first I thought I would have to write my own mixer and handle
the channels, sample rate, and sample size issues myself. I really don't
want to have to do that. Then I noticed in the libao documentation that
nothing says that I cannot spawn two threads, each of which calls
ao_open_live() and ao_play() on different sound files. Indeed, the docs
for ao_initialize() seem to suggest this can be done with the statement
that it be called in the main thread.
I tried this and it works so erratically that I'm not sure libao was
written with this in mind. I get these results in order of likelihood:
1) "Segmentation fault"
2) "*** glibc detected *** ./threadtest7: malloc(): memory corruption
(fast): 0x0000000001bc5390 *** Bus error"
3) "*** glibc detected *** ./threadtest7: double free or corruption (out):
0x00000000018ba2e0 ***"
4) A bit of the first file, then the second file.
5) Only the second file.
6) Both files messily mixed with a zipping noise. (very rare)
Is libao in fact intentionally capable of doing this? If not, what are my
options for mixing music and sound effects? I really don't want to use
SDL_mixer for a variety of reasons, chiefly because my program is
terminal-only. Virtual beer if you can guess what the program is.
--
David Griffith
[email protected]
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
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