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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b62e08de6e
Original commit message from CVS: Fix monoscope: caps already asked for mono input: make it actually expect such input.
137 lines
3.4 KiB
C
137 lines
3.4 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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#include "monoscope.h"
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#include "convolve.h"
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#define scope_width 256
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#define scope_height 128
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static gint16 copyEq[CONVOLVE_BIG];
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static int avgEq[CONVOLVE_SMALL]; // a running average of the last few.
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static int avgMax; // running average of max sample.
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static guint32 display[(scope_width + 1) * (scope_height + 1)];
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static convolve_state *state = NULL;
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static guint32 colors[64];
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static void 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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void monoscope_init (guint32 resx, guint32 resy)
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{
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state = convolve_init();
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colors_init(colors);
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}
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guint32 * monoscope_update (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 (copyEq, data, sizeof (short) * CONVOLVE_BIG);
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thisEq = copyEq;
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#if 1
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val = convolve_match (avgEq, copyEq, state);
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thisEq += val;
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#endif
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memset(display, 0, 256 * 128 * sizeof(guint32));
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for (i=0; i < 256; i++) {
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foo = thisEq[i] + (avgEq[i] >> 1);
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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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avgMax += max - (avgMax >> 8);
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if (avgMax < max)
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avgMax = max; /* Avoid overflow */
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factor = 0x7fffffff / 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 = 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 = display + bar;
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if (foo < 0) {
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for (h = 0; h <= (-foo); h++) {
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*loc = 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 = 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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display[(i << 8) + h] = colors[63];
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if (i == 64)
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display[(i << 8) + h + 1] = 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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display[i + (h << 8)] = colors[63];
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}
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}
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return display;
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}
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void monoscope_close ()
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{
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}
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