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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. The orginal code was by Tinic Uro and under
* the BSD license without a advertisig clause. Andy Lo A Foe then relicensed the
* code when he used it for Alsaplayer to GPL with Tinic's permission. Richard Boulton
* then took this code and made a GPL plugin out of it.
*
* 7th December 2004 Christian Schaller: Richard Boulton and Andy Lo A Foe gave
* permission to relicense their changes under BSD license so we where able to restore the
* code to Tinic's original BSD license.
*
* This file is under what is known as the BSD license:
*
* Redistribution and use in source and binary forms, with or without modification, i
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "monoscope.h"
#include <string.h>
#include <stdlib.h>
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);
}
struct monoscope_state *
monoscope_init (guint32 resx, guint32 resy)
{
struct monoscope_state *stateptr;
/* I didn't program monoscope to only do 256*128, but it works that way */
g_return_val_if_fail (resx == 256, 0);
g_return_val_if_fail (resy == 128, 0);
stateptr = calloc (1, sizeof (struct monoscope_state));
if (stateptr == 0)
return 0;
stateptr->cstate = convolve_init ();
colors_init (stateptr->colors);
return stateptr;
}
guint32 *
monoscope_update (struct monoscope_state * stateptr, gint16 data[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;
int foo;
int bar;
int h;
guint32 *loc;
int factor;
int val;
int max = 1;
short *thisEq;
memcpy (stateptr->copyEq, data, sizeof (short) * CONVOLVE_BIG);
thisEq = stateptr->copyEq;
#if 1
val = convolve_match (stateptr->avgEq, stateptr->copyEq, stateptr->cstate);
thisEq += val;
#endif
memset (stateptr->display, 0, 256 * 128 * sizeof (guint32));
for (i = 0; i < 256; i++) {
foo = thisEq[i] + (stateptr->avgEq[i] >> 1);
stateptr->avgEq[i] = foo;
if (foo < 0)
foo = -foo;
if (foo > max)
max = foo;
}
stateptr->avgMax += max - (stateptr->avgMax >> 8);
if (stateptr->avgMax < max)
stateptr->avgMax = max; /* Avoid overflow */
factor = 0x7fffffff / stateptr->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 = stateptr->avgEq[i] * factor;
foo >>= 18;
if (foo > 63)
foo = 63;
if (foo < -63)
foo = -63;
val = (i + ((foo + 64) << 8));
bar = val;
if ((bar > 0) && (bar < (256 * 128))) {
loc = stateptr->display + bar;
if (foo < 0) {
for (h = 0; h <= (-foo); h++) {
*loc = stateptr->colors[h];
loc += 256;
}
} else {
for (h = 0; h <= foo; h++) {
*loc = stateptr->colors[h];
loc -= 256;
}
}
}
}
/* Draw grid. */
for (i = 16; i < 128; i += 16) {
for (h = 0; h < 256; h += 2) {
stateptr->display[(i << 8) + h] = stateptr->colors[63];
if (i == 64)
stateptr->display[(i << 8) + h + 1] = stateptr->colors[63];
}
}
for (i = 16; i < 256; i += 16) {
for (h = 0; h < 128; h += 2) {
stateptr->display[i + (h << 8)] = stateptr->colors[63];
}
}
return stateptr->display;
}
void
monoscope_close (struct monoscope_state *stateptr)
{
}
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