2001-02-24  Gene Z. Ragan  <gzr@eazel.com>

	reviewed by: George Lebl <jirka@5z.com>

	Fixed bug 3546, Nautilus fails if MP3 previews in rapid succession

	Fixed bug 5105, Preview sound file during MP3 playback
	-> "/dev/dsp: Device or resource busy"

	* libnautilus-extensions/nautilus-global-preferences.h:
	Add a preference that that tracks the result of an intial
	audio output capability check during nautilus_sound_initialize().

	* libnautilus-extensions/nautilus-sound.c:
	(nautilus_sound_initialize):
	Check audio output capability and save the result of the check in
	a preference.

	(nautilus_sound_can_play_sound):
	Check saved preference instead of opening and closing esd as a
	way to check if sound output is available.  The constant opening
	and closing creating a latency problem withing esd and was
	affecting the audio preview mechanism.