I'm too lazy to comment this

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1 files changed, 143 insertions, 0 deletions

diff --git a/gst/monoscope/monoscope.c b/gst/monoscope/monoscope.c
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+++ b/gst/monoscope/monoscope.c
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+/*  monoscope.cpp
+ *  Copyright (C) 2002 Richard Boulton <richard@tartarus.org>
+ *  Copyright (C) 1998-2001 Andy Lo A Foe <andy@alsaplayer.org>
+ *  Original code by Tinic Uro
+ *
+ *  This code is copied from Alsaplayer.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include "monoscope.h"
+#include "convolve.h"
+
+#define scope_width 256
+#define scope_height 128
+
+static gint16 newEq[CONVOLVE_BIG];      // latest block of 512 samples.
+static gint16 copyEq[CONVOLVE_BIG];
+static int avgEq[CONVOLVE_SMALL];      // a running average of the last few.
+static int avgMax;                     // running average of max sample.
+static guint32 display[(scope_width + 1) * (scope_height + 1)];
+
+static convolve_state *state = NULL;
+static guint32 colors[64];
+
+static void colors_init(guint32 * colors)
+{
+    int i;
+    for (i = 0; i < 32; i++) {
+	colors[i] = (i*8 << 16) + (255 << 8);
+	colors[i+31] = (255 << 16) + (((31 - i) * 8) << 8);
+    }
+    colors[63] = (40 << 16) + (75 << 8);
+}
+
+void monoscope_init (guint32 resx, guint32 resy)
+{
+    state = convolve_init();
+    colors_init(colors);
+}
+
+guint32 * monoscope_update (gint16 data [2][512])
+{
+    /* Note that CONVOLVE_BIG must == data size here, ie 512. */
+    /* Really, we want samples evenly spread over the available data.
+     * Just taking a continuous chunk will do for now, though. */
+    int i;
+    for (i = 0; i < CONVOLVE_BIG; i++) {
+	/* Average the two channels. */
+	newEq[i] = (((int) data[0][i]) + (int) data[1][i]) >> 1;
+    }
+
+    int foo;
+    int bar;  
+    int h;
+    guchar bits[ 257 * 129];
+    guint32 *loc;
+
+	int factor;
+	int val;
+	int max = 1;
+	short * thisEq;
+	memcpy (copyEq, newEq, sizeof (short) * CONVOLVE_BIG);
+	thisEq = copyEq;
+#if 1					
+	val = convolve_match (avgEq, copyEq, state);
+	thisEq += val;
+#endif					
+	memset(display, 0, 256 * 128 * sizeof(guint32));
+	for (i=0; i < 256; i++) {
+	    foo = thisEq[i] + (avgEq[i] >> 1);
+	    avgEq[i] = foo;
+	    if (foo < 0)
+		foo = -foo;
+	    if (foo > max)
+		max = foo;
+	}
+	avgMax += max - (avgMax >> 8);
+	if (avgMax < max)
+	    avgMax = max; /* Avoid overflow */
+	factor = 0x7fffffff / avgMax;
+	/* Keep the scaling sensible. */
+	if (factor > (1 << 18))
+	    factor = 1 << 18;
+	if (factor < (1 << 8))
+	    factor = 1 << 8;
+	for (i=0; i < 256; i++) {
+	    foo = avgEq[i] * factor;
+	    foo >>= 18;
+	    if (foo > 63)
+		foo = 63;
+	    if (foo < -64)
+		foo = -64;
+	    val = (i + ((foo+64) << 8));
+	    bar = val;
+	    if ((bar > 0) && (bar < (256 * 128))) {
+		loc = display + bar;
+		if (foo < 0) {
+		    for (h = 0; h <= (-foo); h++) {
+			*loc = colors[h];
+			loc+=256; 
+		    }
+		} else {
+		    for (h = 0; h <= foo; h++) {
+			*loc = colors[h];
+			loc-=256;
+		    }
+		}
+	    }
+	}
+
+	/* Draw grid. */
+	for (i=16;i < 128; i+=16) {
+	    for (h = 0; h < 256; h+=2) {
+		display[(i << 8) + h] = colors[63];
+		if (i == 64)
+		    display[(i << 8) + h + 1] = colors[63];
+	    }
+	}
+	for (i = 16; i < 256; i+=16) {
+	    for (h = 0; h < 128; h+=2) {
+		display[i + (h << 8)] = colors[63];
+	    }
+	}
+
+    return display;
+}
+
+void monoscope_close ()
+{
+}
+