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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.
*/
#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;
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 < -64)
foo = -64;
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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