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Fix tempo problems in pcsound linux driver.

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Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 878
This commit is contained in:
Simon Howard 2007-05-19 16:42:56 +00:00
parent 2a026e1277
commit 64c188aa8e
1 changed files with 47 additions and 1 deletions
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48
pcsound/pcsound_linux.c
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@ -47,6 +47,52 @@ static int console_handle;
static pcsound_callback_func callback;
static int sound_thread_running = 0;
static SDL_Thread *sound_thread_handle;
static int sleep_adjust = 0;
static void AdjustedSleep(unsigned int ms)
{
unsigned int start_time;
unsigned int end_time;
unsigned int actual_time;
// Adjust based on previous error to keep the tempo right
if (sleep_adjust > ms)
{
sleep_adjust -= ms;
return;
}
else
{
ms -= sleep_adjust;
}
// Do the sleep and record how long it takes
start_time = SDL_GetTicks();
SDL_Delay(ms);
end_time = SDL_GetTicks();
if (end_time > start_time)
{
actual_time = end_time - start_time;
}
else
{
actual_time = ms;
}
if (actual_time < ms)
{
actual_time = ms;
}
// Save sleep_adjust for next time
sleep_adjust = actual_time - ms;
}
static int SoundThread(void *unused)
{
@ -69,7 +115,7 @@ static int SoundThread(void *unused)
ioctl(console_handle, KIOCSOUND, cycles);
usleep(duration * 1000);
AdjustedSleep(duration);
}
return 0;