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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2015 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <string.h> | |
23 | #include <libsigrok/libsigrok.h> | |
24 | #include "libsigrok-internal.h" | |
25 | ||
26 | #define LOG_PREFIX "transform/scale" | |
27 | ||
28 | struct context { | |
29 | struct sr_rational factor; | |
30 | }; | |
31 | ||
32 | static int init(struct sr_transform *t, GHashTable *options) | |
33 | { | |
34 | struct context *ctx; | |
35 | ||
36 | if (!t || !t->sdi || !options) | |
37 | return SR_ERR_ARG; | |
38 | ||
39 | t->priv = ctx = g_malloc0(sizeof(struct context)); | |
40 | ||
41 | g_variant_get(g_hash_table_lookup(options, "factor"), "(xt)", | |
42 | &ctx->factor.p, &ctx->factor.q); | |
43 | ||
44 | return SR_OK; | |
45 | } | |
46 | ||
47 | static int receive(const struct sr_transform *t, | |
48 | struct sr_datafeed_packet *packet_in, | |
49 | struct sr_datafeed_packet **packet_out) | |
50 | { | |
51 | struct context *ctx; | |
52 | const struct sr_datafeed_analog *analog; | |
53 | struct sr_channel *ch; | |
54 | GSList *l; | |
55 | float *fdata; | |
56 | float factor; | |
57 | int i, num_channels, c; | |
58 | ||
59 | if (!t || !t->sdi || !packet_in || !packet_out) | |
60 | return SR_ERR_ARG; | |
61 | ctx = t->priv; | |
62 | ||
63 | switch (packet_in->type) { | |
64 | case SR_DF_ANALOG: | |
65 | analog = packet_in->payload; | |
66 | fdata = (float *)analog->data; | |
67 | num_channels = g_slist_length(analog->channels); | |
68 | factor = (float) ctx->factor.p / ctx->factor.q; | |
69 | for (i = 0; i < analog->num_samples; i++) { | |
70 | /* For now scale all values in all channels. */ | |
71 | for (l = analog->channels, c = 0; l; l = l->next, c++) { | |
72 | ch = l->data; | |
73 | (void)ch; | |
74 | fdata[i * num_channels + c] *= factor; | |
75 | } | |
76 | } | |
77 | break; | |
78 | default: | |
79 | sr_spew("Unsupported packet type %d, ignoring.", packet_in->type); | |
80 | break; | |
81 | } | |
82 | ||
83 | /* Return the in-place-modified packet. */ | |
84 | *packet_out = packet_in; | |
85 | ||
86 | return SR_OK; | |
87 | } | |
88 | ||
89 | static int cleanup(struct sr_transform *t) | |
90 | { | |
91 | struct context *ctx; | |
92 | ||
93 | if (!t || !t->sdi) | |
94 | return SR_ERR_ARG; | |
95 | ctx = t->priv; | |
96 | ||
97 | g_free(ctx); | |
98 | t->priv = NULL; | |
99 | ||
100 | return SR_OK; | |
101 | } | |
102 | ||
103 | static struct sr_option options[] = { | |
104 | { "factor", "Factor", "Factor by which to scale the analog values", NULL, NULL }, | |
105 | ALL_ZERO | |
106 | }; | |
107 | ||
108 | static const struct sr_option *get_options(void) | |
109 | { | |
110 | int64_t p = 1; | |
111 | uint64_t q = 1; | |
112 | ||
113 | /* Default to a scaling factor of 1.0. */ | |
114 | if (!options[0].def) | |
115 | options[0].def = g_variant_ref_sink(g_variant_new(("(xt"), &p, &q)); | |
116 | ||
117 | return options; | |
118 | } | |
119 | ||
120 | SR_PRIV struct sr_transform_module transform_scale = { | |
121 | .id = "scale", | |
122 | .name = "Scale", | |
123 | .desc = "Scale analog values by a specified factor", | |
124 | .options = get_options, | |
125 | .init = init, | |
126 | .receive = receive, | |
127 | .cleanup = cleanup, | |
128 | }; |