2 * This file is part of the libsigrok project.
4 * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <libsigrok/libsigrok.h>
24 #include "libsigrok-internal.h"
26 #define LOG_PREFIX "transform/invert"
28 static int receive(const struct sr_transform *t,
29 struct sr_datafeed_packet *packet_in,
30 struct sr_datafeed_packet **packet_out)
32 const struct sr_datafeed_logic *logic;
33 const struct sr_datafeed_analog_old *analog_old;
34 const struct sr_datafeed_analog *analog;
35 struct sr_channel *ch;
38 int si, num_channels, c;
43 if (!t || !t->sdi || !packet_in || !packet_out)
46 switch (packet_in->type) {
48 logic = packet_in->payload;
49 for (i = 0; i <= logic->length - logic->unitsize; i += logic->unitsize) {
50 for (j = 0; j < logic->unitsize; j++) {
51 /* For now invert every bit in every byte. */
52 b = (uint8_t *)logic->data + i + logic->unitsize - 1 - j;
57 case SR_DF_ANALOG_OLD:
58 analog_old = packet_in->payload;
59 fdata = (float *)analog_old->data;
60 num_channels = g_slist_length(analog_old->channels);
61 for (si = 0; si < analog_old->num_samples; si++) {
62 /* For now invert all values in all channels. */
63 for (l = analog_old->channels, c = 0; l; l = l->next, c++) {
66 f = &fdata[si * num_channels + c];
72 analog = packet_in->payload;
73 p = analog->encoding->scale.p;
74 q = analog->encoding->scale.q;
77 analog->encoding->scale.p = (p < 0) ? -q : q;
78 analog->encoding->scale.q = (p < 0) ? -p : p;
81 sr_spew("Unsupported packet type %d, ignoring.", packet_in->type);
85 /* Return the in-place-modified packet. */
86 *packet_out = packet_in;
91 SR_PRIV struct sr_transform_module transform_invert = {
94 .desc = "Invert values",