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monoscope: code cleanup
Use constants more often. Cleanup comments and add more to explain how things work.
This commit is contained in:
Stefan Sauer
parent
3738ce8ba1
commit
daea0540fd
2 changed files with 54 additions and 53 deletions
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@ -17,10 +17,10 @@
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*
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*
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* Note: 7th December 2004: This file used to be licensed under the GPL,
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* but we got permission from Ralp Loader to relicense it to LGPL.
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*
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*
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* $Id$
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*
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*/
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@ -248,18 +248,25 @@ convolve_run (stack_entry * top, unsigned size, double *scratch)
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} while (top->b.main != NULL);
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}
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int
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convolve_match (const int *lastchoice,
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const short *input, convolve_state * state)
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/* lastchoice is a 256 sized array. input is a 512 array. We find the
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* contiguous length 256 sub-array of input that best matches lastchoice.
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* A measure of how good a sub-array is compared with the lastchoice is
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* given by the sum of the products of each pair of entries. We maximise
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/*
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* convolve_match:
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* @lastchoice: an array of size SMALL.
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* @input: an array of siue BIG (2*SMALL)
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* @state: a (non-NULL) pointer returned by convolve_init.
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*
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* We find the contiguous SMALL-size sub-array of input that best matches
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* lastchoice. A measure of how good a sub-array is compared with the lastchoice
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* is given by the sum of the products of each pair of entries. We maximise
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* that, by taking an appropriate convolution, and then finding the maximum
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* entry in the convolutions. state is a (non-NULL) pointer returned by
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* convolve_init. */
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* entry in the convolutions.
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*
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* Return: the position of the best match
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*/
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int
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convolve_match (const int *lastchoice, const short *input,
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convolve_state * state)
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{
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double avg;
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double avg = 0;
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double best;
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int p = 0;
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int i;
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@ -268,47 +275,45 @@ convolve_match (const int *lastchoice,
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double *scratch = state->scratch;
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stack_entry *top = state->stack + (STACK_SIZE - 1);
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#if 1
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for (i = 0; i < 512; i++)
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for (i = 0; i < CONVOLVE_BIG; i++)
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left[i] = input[i];
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avg = 0;
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for (i = 0; i < 256; i++) {
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double a = lastchoice[255 - i];
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for (i = 0; i < CONVOLVE_SMALL; i++) {
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double a = lastchoice[(CONVOLVE_SMALL - 1) - i];
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right[i] = a;
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avg += a;
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}
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#endif
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/* We adjust the smaller of the two input arrays to have average
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* value 0. This makes the eventual result insensitive to both
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* constant offsets and positive multipliers of the inputs. */
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avg /= 256;
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for (i = 0; i < 256; i++)
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avg /= CONVOLVE_SMALL;
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for (i = 0; i < CONVOLVE_SMALL; i++)
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right[i] -= avg;
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/* End-of-stack marker. */
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top[1].b.null = scratch;
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top[1].b.main = NULL;
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/* The low 256x256, of which we want the high 256 outputs. */
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/* The low SMALLxSMALL, of which we want the high outputs. */
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top->v.left = left;
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top->v.right = right;
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top->v.out = right + 256;
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convolve_run (top, 256, scratch);
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top->v.out = right + CONVOLVE_SMALL;
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convolve_run (top, CONVOLVE_SMALL, scratch);
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/* The high 256x256, of which we want the low 256 outputs. */
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top->v.left = left + 256;
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/* The high SMALLxSMALL, of which we want the low outputs. */
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top->v.left = left + CONVOLVE_SMALL;
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top->v.right = right;
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top->v.out = right;
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convolve_run (top, 256, scratch);
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convolve_run (top, CONVOLVE_SMALL, scratch);
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/* Now find the best position amoungs this. Apart from the first
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* and last, the required convolution outputs are formed by adding
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* outputs from the two convolutions above. */
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best = right[511];
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right[767] = 0;
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best = right[CONVOLVE_BIG - 1];
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right[CONVOLVE_BIG + CONVOLVE_SMALL + 1] = 0;
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p = -1;
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for (i = 0; i < 256; i++) {
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double a = right[i] + right[i + 512];
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for (i = 0; i < CONVOLVE_SMALL; i++) {
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double a = right[i] + right[i + CONVOLVE_BIG];
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if (a > best) {
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best = a;
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@ -320,21 +325,19 @@ convolve_match (const int *lastchoice,
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#if 0
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{
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/* This is some debugging code... */
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int bad = 0;
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best = 0;
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for (i = 0; i < 256; i++)
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for (i = 0; i < CONVOLVE_SMALL; i++)
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best += ((double) input[i + p]) * ((double) lastchoice[i] - avg);
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for (i = 0; i < 257; i++) {
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for (i = 0; i <= CONVOLVE_SMALL; i++) {
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double tot = 0;
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unsigned int j;
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for (j = 0; j < 256; j++)
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for (j = 0; j < CONVOLVE_SMALL; j++)
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tot += ((double) input[i + j]) * ((double) lastchoice[j] - avg);
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if (tot > best)
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printf ("(%i)", i);
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if (tot != left[i + 255])
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if (tot != left[i + (CONVOLVE_SMALL - 1)])
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printf ("!");
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}
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@ -7,9 +7,9 @@
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* the BSD license without a advertisig clause. Andy Lo A Foe then relicensed the
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* code when he used it for Alsaplayer to GPL with Tinic's permission. Richard Boulton
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* then took this code and made a GPL plugin out of it.
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*
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*
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* 7th December 2004 Christian Schaller: Richard Boulton and Andy Lo A Foe gave
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* permission to relicense their changes under BSD license so we where able to restore the
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* permission to relicense their changes under BSD license so we where able to restore the
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* code to Tinic's original BSD license.
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*
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* This file is under what is known as the BSD license:
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@ -17,21 +17,21 @@
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* Redistribution and use in source and binary forms, with or without modification, i
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products derived from
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* 3. The name of the author may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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@ -95,14 +95,12 @@ monoscope_update (struct monoscope_state *stateptr, gint16 data[512])
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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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short *thisEq = stateptr->copyEq;
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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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memcpy (thisEq, data, sizeof (short) * CONVOLVE_BIG);
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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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