114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de>
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <string.h>
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#include <libsigrok/libsigrok.h>
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#include "libsigrok-internal.h"
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#define LOG_PREFIX "transform/scale"
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struct context {
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struct sr_rational factor;
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};
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static int init(struct sr_transform *t, GHashTable *options)
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{
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struct context *ctx;
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if (!t || !t->sdi || !options)
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return SR_ERR_ARG;
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t->priv = ctx = g_malloc0(sizeof(struct context));
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g_variant_get(g_hash_table_lookup(options, "factor"), "(xt)",
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&ctx->factor.p, &ctx->factor.q);
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return SR_OK;
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}
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static int receive(const struct sr_transform *t,
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struct sr_datafeed_packet *packet_in,
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struct sr_datafeed_packet **packet_out)
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{
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struct context *ctx;
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const struct sr_datafeed_analog *analog;
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if (!t || !t->sdi || !packet_in || !packet_out)
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return SR_ERR_ARG;
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ctx = t->priv;
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switch (packet_in->type) {
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case SR_DF_ANALOG:
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analog = packet_in->payload;
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analog->encoding->scale.p *= ctx->factor.p;
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analog->encoding->scale.q *= ctx->factor.q;
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break;
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default:
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sr_spew("Unsupported packet type %d, ignoring.", packet_in->type);
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break;
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}
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/* Return the in-place-modified packet. */
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*packet_out = packet_in;
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return SR_OK;
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}
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static int cleanup(struct sr_transform *t)
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{
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struct context *ctx;
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if (!t || !t->sdi)
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return SR_ERR_ARG;
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ctx = t->priv;
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g_free(ctx);
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t->priv = NULL;
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return SR_OK;
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}
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static struct sr_option options[] = {
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{ "factor", "Factor", "Factor by which to scale the analog values", NULL, NULL },
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ALL_ZERO
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};
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static const struct sr_option *get_options(void)
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{
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int64_t p = 1;
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uint64_t q = 1;
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/* Default to a scaling factor of 1.0. */
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if (!options[0].def)
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options[0].def = g_variant_ref_sink(g_variant_new("(xt)", &p, &q));
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return options;
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}
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SR_PRIV struct sr_transform_module transform_scale = {
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.id = "scale",
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.name = "Scale",
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.desc = "Scale analog values by a specified factor",
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.options = get_options,
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.init = init,
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.receive = receive,
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.cleanup = cleanup,
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};
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