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Fix that allows SDL's sound to work again.

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This commit is contained in:
Clifford T. Matthews 2009-06-10 12:15:06 -06:00
parent 1f8c15713d
commit a4f6fad188
1 changed files with 33 additions and 15 deletions
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48
src/config/sound/sdl/sdl-sound.c
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@ -7,11 +7,6 @@
* a different way to drive SDL's sound. * a different way to drive SDL's sound.
*/ */
#if !defined (OMIT_RCSID_STRINGS)
char ROMlib_rcsid_linux_sound[] =
"$Id: sdl-sound.c 115 2005-07-05 22:40:28Z ctm $";
#endif
#include "rsys/common.h" #include "rsys/common.h"
#include <sys/soundcard.h> #include <sys/soundcard.h>
@ -30,7 +25,18 @@ char ROMlib_rcsid_linux_sound[] =
#include "sdl-sound.h" #include "sdl-sound.h"
#define LOGBUFSIZE 11 /* Must be between 7 and 17 decimal */ #define LOGBUFSIZE 11 /* Must be between 7 and 17 decimal */
#define BUFSIZE (1 << LOGBUFSIZE)
/*
* There's what appears to be a bug in some of the SDLs out there that
* results in SDL choosing to use one half the number of samples that we ask
* for. As such, we're going to make room for twice the amount we want and
* then ask for twice the amount. If we get it, oh well, it just means
* more latency.
*/
static int num_samples;
#define BUFSIZE (1 << (LOGBUFSIZE+1)) /* +1 as bug workaround */
/* Stack size for child thread */ /* Stack size for child thread */
#define STACKSIZE 16384 #define STACKSIZE 16384
@ -123,7 +129,7 @@ sound_sdl_stop (sound_driver_t *s)
static void static void
sound_sdl_hunger_start (sound_driver_t *s) sound_sdl_hunger_start (sound_driver_t *s)
{ {
t1 += BUFSIZE; t1 += num_samples;
} }
static unsigned char buf[7*BUFSIZE]; static unsigned char buf[7*BUFSIZE];
@ -136,10 +142,10 @@ sound_sdl_get_hunger_info (sound_driver_t *s)
struct hunger_info info; struct hunger_info info;
info.buf = buf; info.buf = buf;
info.bufsize = sizeof (buf) / sizeof (buf[0]); info.bufsize = 7 * num_samples;
info.t2 = t1 + BUFSIZE; info.t2 = t1 + num_samples;
info.t3 = info.t2 + BUFSIZE; info.t3 = info.t2 + num_samples;
info.t4 = info.t3; info.t4 = info.t3;
return info; return info;
@ -171,14 +177,14 @@ sound_sdl_hunger_finish (sound_driver_t *s)
info = sound_sdl_get_hunger_info (s); info = sound_sdl_get_hunger_info (s);
while (sdl_write (info.buf + (info.t2 % info.bufsize), BUFSIZE) while (sdl_write (info.buf + (info.t2 % info.bufsize), num_samples)
< 0) < 0)
{ {
if (errno != EINTR) if (errno != EINTR)
gui_fatal ("Write failed"); gui_fatal ("Write failed");
} }
memset (info.buf + (info.t2 % info.bufsize), 0x80, BUFSIZE); memset (info.buf + (info.t2 % info.bufsize), 0x80, num_samples);
patl_signal (); patl_signal ();
} }
@ -267,8 +273,8 @@ sound_sdl_hunger_callback(void *unused, Uint8 *stream, int len)
// close (fd); // close (fd);
// fprintf (stderr, "callback: stream = %p\n", stream); // fprintf (stderr, "callback: stream = %p\n", stream);
if (len != BUFSIZE) if (len != num_samples)
gui_fatal ("len = %d, expected %d", len, BUFSIZE); gui_fatal ("len = %d, expected %d", len, num_samples);
sdl_stream = stream; sdl_stream = stream;
while (sdl_stream != 0) while (sdl_stream != 0)
usleep (1); usleep (1);
@ -341,8 +347,20 @@ sound_sdl_init (sound_driver_t *s)
} }
} }
num_samples = spec.samples;
if (spec.samples != BUFSIZE / 2) {
if (spec.samples == BUFSIZE)
fprintf(stderr, "Got number of samples we asked for\n");
else if (spec.samples == 0 || spec.samples > BUFSIZE) {
fprintf(stderr, "Failing: Got %d samples, asked for %d\n", spec.samples,
BUFSIZE);
goto fail;
} else
fprintf(stderr, "Got %d samples\n", spec.samples);
}
memset (buf, 0x80, sizeof (buf)); memset (buf, 0x80, sizeof (buf));
sdl_write (buf, BUFSIZE); sdl_write (buf, num_samples);
semid = semget (IPC_PRIVATE, 1, IPC_CREAT | IPC_EXCL | 0666); semid = semget (IPC_PRIVATE, 1, IPC_CREAT | IPC_EXCL | 0666);
if (semid < 0) if (semid < 0)