Imported Upstream version 4.2-build2006upstream/4.2-build2006upstream

1 files changed, 179 insertions, 0 deletions

diff --git a/misc/samples/ddksample/ddksample_misc.c b/misc/samples/ddksample/ddksample_misc.c
new file mode 100644
index 0000000..8876a2c
--- /dev/null
+++ b/misc/samples/ddksample/ddksample_misc.c
@@ -0,0 +1,179 @@
+/*
+ * ddksample_audio.c -  OSS DDK sample driver - misc routines
+ *
+ * Description:
+ * This file contains routines that are not related with the
+ * OSS DDK interface. To understand how OSS DDK works you don't need to
+ * pay any attention on these routines. They are here just to produce
+ * some data for the mixer routines (ddksample_mixer.c).
+ *
+ * ddksample_misc.c emulates some arbitrary audio device. It does
+ * volume scaling to the output data and computes the peak meters from the
+ * result of the scaling.
+ */
+/*
+ *
+ * This file is part of Open Sound System.
+ *
+ * Copyright (C) 4Front Technologies 1996-2008.
+ *
+ * This this source file is released under GPL v2 license (no other versions).
+ * See the COPYING file included in the main directory of this source
+ * distribution for the license terms and conditions.
+ *
+ */
+
+
+/*
+ * Solaris DDI includes
+ */
+#include <sys/types.h>
+#include <sys/modctl.h>
+#include <sys/kmem.h>
+#include <sys/conf.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+
+/*
+ * OSS specific includes
+ */
+#include <sys/soundcard.h>
+#include <sys/ossddk/ossddk.h>
+
+#include "ddksample.h"
+
+/**************************************************/
+void
+ddksample_do_math (ddksample_portc * portc, void *buf, int len)
+{
+  int i;
+  ddksample_devc *devc = ossddk_adev_get_devc (portc->dev);
+
+  switch (portc->bits + portc->channels)
+    {
+    case 16 + 1:		/* 16 bits / mono */
+      {
+	int val;
+	int peak = 0;
+	short *p = buf;
+
+	len /= sizeof (*p);
+
+	for (i = 0; i < len; i++)
+	  {
+	    /* Do volume computations */
+
+	    val = *p++ << 8;	/* Scale up to 24 bits */
+
+	    val = (val * portc->left_volume) / DDKSAMPLE_MAX_VOL;
+
+	    /*
+	     * Note that legacy mixer volume max is always
+	     * 100.
+	     */
+	    val = (val * devc->mainvol_left) / 100;
+
+	    /*
+	     * Now we have the sample value after volume control.
+	     * This driver doesn't store this value anywhere but
+	     * if necessary this functionality can be added here.
+
+	     /*
+	     * Next compute the peak value
+	     */
+
+	    if (val < 0)
+	      val = -val;	/* Absolute value */
+
+	    if (val > peak)
+	      peak = val;
+	  }
+
+	if (peak > portc->left_peak)
+	  portc->left_peak = peak;
+	if (peak > portc->right_peak)
+	  portc->right_peak = peak;
+      }
+      break;
+
+    case 16 + 2:		/* 16 bits / stereo */
+      {
+	int val;
+	int left_peak = 0, right_peak = 0;
+	short *p = buf;
+
+	len /= sizeof (*p);
+
+	for (i = 0; i < len; i += 2)	/* Each stereo sa,ple pair */
+	  {
+	    /*
+	     * Left channel
+	     */
+
+	    /* Do volume computations */
+
+	    val = (*p++) << 8;	/* Scale up to 24 bits */
+
+	    val = (val * portc->left_volume) / DDKSAMPLE_MAX_VOL;
+
+	    /*
+	     * Note that legacy mixer volume max is always
+	     * 100.
+	     */
+	    val = (val * devc->mainvol_left) / 100;
+
+	    /*
+	     * Now we have the sample value after volume control.
+	     * This driver doesn't store this value anywhere but
+	     * if necessary this functionality can be added here.
+
+	     /*
+	     * Next compute the peak value
+	     */
+
+	    if (val < 0)
+	      val = -val;	/* Absolute value */
+
+	    if (val > left_peak)
+	      left_peak = val;
+
+	    /*
+	     * Right channel
+	     */
+
+	    /* Do volume computations */
+
+	    val = (*p++) << 8;	/* Scale up to 24 bits */
+
+	    val = (val * portc->left_volume) / DDKSAMPLE_MAX_VOL;
+
+	    /*
+	     * Note that legacy mixer volume max is always
+	     * 100.
+	     */
+	    val = (val * devc->mainvol_left) / 100;
+
+	    /*
+	     * Now we have the sample value after volume control.
+	     * This driver doesn't store this value anywhere but
+	     * if necessary this functionality can be added here.
+
+	     /*
+	     * Next compute the peak value
+	     */
+
+	    if (val < 0)
+	      val = -val;	/* Absolute value */
+
+	    if (val > right_peak)
+	      right_peak = val;
+	  }
+
+	if (left_peak > portc->left_peak)
+	  portc->left_peak = left_peak;
+	if (right_peak > portc->right_peak)
+	  portc->right_peak = right_peak;
+      }
+      break;
+    }
+}