+/*
+ * (C) GraÅžvydas "notaz" Ignotas, 2009-2010
+ *
+ * This work is licensed under the terms of any of these licenses
+ * (at your option):
+ * - GNU GPL, version 2 or later.
+ * - GNU LGPL, version 2.1 or later.
+ * - MAME license.
+ * See the COPYING file in the top-level directory.
+ */
+
/* sound output via OSS */
#include <stdio.h>
#include <sys/types.h>
#include "sndout_oss.h"
+int sndout_oss_frag_frames = 1;
+int sndout_oss_can_restart = 1;
+
static int sounddev = -1, mixerdev = -1;
static int can_write_safe;
void sndout_oss_stop(void)
{
+ /* restarting audio on GP2X causes trouble,
+ * not restarting on Caanoo causes trouble */
+ if (!sndout_oss_can_restart)
+ return;
+
if (sounddev < 0)
return;
- ioctl(sounddev, SOUND_PCM_SYNC, 0);
+ // sync causes trouble on Caanoo..
+ //ioctl(sounddev, SNDCTL_DSP_SYNC, 0);
+
close(sounddev);
sounddev = -1;
}
-int sndout_oss_start(int rate, int stereo, int frames_in_frag)
+int sndout_oss_start(int rate, int stereo)
{
static int s_oldrate = 0, s_oldstereo = 0;
int frag, bsize, bits, ret;
}
}
- // try to fit frames_in_frag frames worth of data in fragment
+ // try to fit sndout_oss_frag_frames (video) frames
+ // worth of sound data in OSS fragment
// ignore mono because it's unlikely to be used and
// both GP2X and Wiz mixes mono to stereo anyway.
- bsize = (frames_in_frag * rate / 50) * 4;
+ bsize = (sndout_oss_frag_frames * rate / 50) * 4;
for (frag = 0; bsize; bsize >>= 1, frag++)
;
return write(sounddev, buff, len);
}
+#include "../plat.h"
+
+/* not really non-blocking, just detects if blocking occurs
+ * and starts skipping writes in case it does. */
+int sndout_oss_write_nb(const void *buff, int len)
+{
+ static int lag_counter, skip_counter;
+ unsigned int t;
+ int ret;
+
+ if (lag_counter > 2) {
+ // skip writes if audio starts blocking
+ lag_counter = 0;
+ skip_counter = FRAG_COUNT;
+ }
+
+ if (skip_counter > 0) {
+ skip_counter--;
+ return len;
+ }
+
+ t = plat_get_ticks_ms();
+ ret = sndout_oss_write(buff, len);
+ t = plat_get_ticks_ms() - t;
+ if (t > 1) {
+ // this shouldn't really happen, most likely audio is out of sync
+ lag_counter++;
+ if (lag_counter > 2)
+ printf("audio lag %u\n", t);
+ }
+ else
+ lag_counter = 0;
+
+ return ret;
+}
+
int sndout_oss_can_write(int bytes)
{
audio_buf_info bi;
return bi.bytes - bi.fragsize >= bytes ? 1 : 0;
}
-void sndout_oss_sync(void)
+void sndout_oss_wait(void)
{
- ioctl(sounddev, SOUND_PCM_SYNC, 0);
+ // FIXME?
+ ioctl(sounddev, SNDCTL_DSP_SYNC, 0);
}
void sndout_oss_setvol(int l, int r)
void sndout_oss_exit(void)
{
- if (sounddev >= 0) close(sounddev); sounddev = -1;
- if (mixerdev >= 0) close(mixerdev); mixerdev = -1;
+ if (sounddev >= 0)
+ close(sounddev);
+ if (mixerdev >= 0)
+ close(mixerdev);
+ sounddev = mixerdev = -1;
}