v3.74

1 files changed, 68 insertions, 0 deletions

diff --git a/common/sound.c b/common/sound.c
new file mode 100644
index 0000000..490d3f2
--- /dev/null
+++ b/common/sound.c
@@ -0,0 +1,68 @@
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <pthread.h>
+
+#include "grab-ng.h"
+#include "sound.h"
+
+void
+oss_levels(struct ng_audio_buf *buf, int *left, int *right)
+{
+    int lmax,rmax,i,level;
+    signed char *s = buf->data;
+    unsigned char *u = buf->data;
+
+    lmax = 0;
+    rmax = 0;
+    switch (buf->fmt.fmtid) {
+    case AUDIO_U8_MONO:
+	i = 0;
+	while (i < buf->size) {
+	    level = abs((int)u[i++] - 128);
+	    if (lmax < level)
+		lmax = level, rmax = level;
+	}
+	break;
+    case AUDIO_U8_STEREO:
+	i = 0;
+	while (i < buf->size) {
+	    level = abs((int)u[i++] - 128);
+	    if (lmax < level)
+		lmax = level;
+	    level = abs((int)u[i++] - 128);
+	    if (rmax < level)
+		rmax = level;
+	}
+	break;
+    case AUDIO_S16_BE_MONO:
+    case AUDIO_S16_LE_MONO:
+	i = (AUDIO_S16_BE_MONO == buf->fmt.fmtid) ? 0 : 1;
+	while (i < buf->size) {
+	    level = abs((int)s[i]);
+	    i += 2;
+	    if (lmax < level)
+		lmax = level, rmax = level;
+	}
+	break;
+    case AUDIO_S16_LE_STEREO:
+    case AUDIO_S16_BE_STEREO:
+	i = (AUDIO_S16_BE_STEREO == buf->fmt.fmtid) ? 0 : 1;
+	while (i < buf->size) {
+	    level = abs((int)s[i]);
+	    i += 2;
+	    if (lmax < level)
+		lmax = level;
+	    level = abs((int)s[i]);
+	    i += 2;
+	    if (rmax < level)
+		rmax = level;
+	}
+	break;
+    }
+    *left  = lmax;
+    *right = rmax;
+}