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