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Make sdl audio work. And despite claims, it's not actually bad

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(except for esd, but that's not sdl's fault).
I havn't tested it with other hardware or different config variables,
and I've experienced the occasional hang or segfault on exit, so
feedback is very welcome. :)
This commit is contained in:
Adam Olsen 2001-04-27 07:41:47 +00:00
parent 7eb57602a2
commit 0dee26397c
3 changed files with 37 additions and 8 deletions
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3
configure.in
View file

@ -756,6 +756,7 @@ AC_ARG_ENABLE(sdl-audio,
if test -z "$SNDTYPE" -a "x$HAVE_SDL" = "xyes"; then
SNDTYPE="SDL"
SOUND_LIBS="$SDL_LIBS"
SOUND_CFLAGS="$SDL_CFLAGS"
fi
)
@ -1188,7 +1189,7 @@ if test "x$optimize" = xyes; then
fi
else
AC_MSG_RESULT(no)
CFLAGS="$CFLAGS -O"
CFLAGS="$CFLAGS "
fi
AC_MSG_CHECKING(for packet logging)

2
libs/audio/targets/Makefile.am
View file

@ -1,4 +1,4 @@
INCLUDES= -I$(top_srcdir)/include
INCLUDES= -I$(top_srcdir)/include $(SOUND_CFLAGS)
lib_LTLIBRARIES = @SND_TARGETS@
EXTRA_LTLIBRARIES = libQFsound.la

40
libs/audio/targets/snd_sdl.c
View file

@ -32,11 +32,13 @@
#include <SDL_audio.h>
#include <SDL_byteorder.h>
#include <stdlib.h>
#include "QF/cmd.h"
#include "QF/console.h"
#include "QF/qargs.h"
#include "QF/sound.h"
#include "QF/sys.h"
static dma_t the_shm;
static int snd_inited;
@ -47,11 +49,27 @@ extern int desired_bits;
static void
paint_audio (void *unused, Uint8 * stream, int len)
{
int streamsamples;
int sampleposbytes;
int samplesbytes;
if (shm) {
shm->buffer = stream;
shm->samplepos += len / (shm->samplebits / 8);
// Check for samplepos overflow?
S_PaintChannels (shm->samplepos);
streamsamples = len / (shm->samplebits / 8);
sampleposbytes = shm->samplepos * (shm->samplebits / 8);
samplesbytes = shm->samples * (shm->samplebits / 8);
shm->samplepos += streamsamples;
if (shm->samplepos >= shm->samples)
shm->samplepos -= shm->samples;
S_PaintChannels (soundtime + streamsamples);
if (shm->samplepos + streamsamples <= shm->samples)
memcpy (stream, shm->buffer + sampleposbytes, len);
else {
memcpy (stream, shm->buffer + sampleposbytes, samplesbytes - sampleposbytes);
memcpy (stream + samplesbytes - sampleposbytes, shm->buffer, len - (samplesbytes - sampleposbytes));
}
soundtime += streamsamples;
}
}
@ -113,6 +131,7 @@ SNDDMA_Init (void)
memcpy (&obtained, &desired, sizeof (desired));
break;
}
SDL_LockAudio();
SDL_PauseAudio (0);
/* Fill the audio DMA information block */
@ -121,10 +140,14 @@ SNDDMA_Init (void)
shm->samplebits = (obtained.format & 0xFF);
shm->speed = obtained.freq;
shm->channels = obtained.channels;
shm->samples = obtained.samples * shm->channels;
shm->samples = obtained.samples * 4;
shm->samplepos = 0;
shm->submission_chunk = 1;
shm->buffer = NULL;
shm->buffer = calloc(shm->samples * (shm->samplebits / 8), 1);
if (!shm->buffer)
{
Sys_Error ("Failed to allocate buffer for sound!\n");
}
snd_inited = 1;
return 1;
@ -140,8 +163,11 @@ void
SNDDMA_Shutdown (void)
{
if (snd_inited) {
SDL_PauseAudio (1);
SDL_UnlockAudio ();
SDL_CloseAudio ();
snd_inited = 0;
shm = NULL;
}
}
@ -155,4 +181,6 @@ SNDDMA_Shutdown (void)
void
SNDDMA_Submit (void)
{
SDL_UnlockAudio();
SDL_LockAudio();
}