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
22 #include <libsigrok/libsigrok.h>
23 #include "libsigrok-internal.h"
25 #define LOG_PREFIX "transform/scale"
31 static int init(struct sr_transform *t, GHashTable *options)
35 if (!t || !t->sdi || !options)
38 t->priv = ctx = g_malloc0(sizeof(struct context));
40 ctx->factor = g_variant_get_double(g_hash_table_lookup(options, "factor"));
45 static int receive(const struct sr_transform *t,
46 struct sr_datafeed_packet *packet_in,
47 struct sr_datafeed_packet **packet_out)
50 const struct sr_datafeed_analog *analog;
51 struct sr_channel *ch;
54 int i, num_channels, c;
56 if (!t || !t->sdi || !packet_in || !packet_out)
60 switch (packet_in->type) {
62 analog = packet_in->payload;
63 fdata = (float *)analog->data;
64 num_channels = g_slist_length(analog->channels);
65 for (i = 0; i < analog->num_samples; i++) {
66 /* For now scale all values in all channels. */
67 for (l = analog->channels, c = 0; l; l = l->next, c++) {
70 fdata[i * num_channels + c] *= ctx->factor;
75 sr_spew("Unsupported packet type %d, ignoring.", packet_in->type);
79 /* Return the in-place-modified packet. */
80 *packet_out = packet_in;
85 static int cleanup(struct sr_transform *t)
99 static struct sr_option options[] = {
100 { "factor", "Factor", "Factor by which to scale the analog values", NULL, NULL },
104 static const struct sr_option *get_options(void)
106 /* Default to a scaling factor of 1.0. */
108 options[0].def = g_variant_ref_sink(g_variant_new_double(1.0));
113 SR_PRIV struct sr_transform_module transform_scale = {
116 .desc = "Scale analog values by a specified factor",
117 .options = get_options,