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43caa466 UH |
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 | ||
6ec6c43b | 21 | #include <config.h> |
43caa466 | 22 | #include <string.h> |
c1aae900 | 23 | #include <libsigrok/libsigrok.h> |
43caa466 UH |
24 | #include "libsigrok-internal.h" |
25 | ||
26 | #define LOG_PREFIX "transform/scale" | |
27 | ||
28 | struct context { | |
2d237f3c | 29 | struct sr_rational factor; |
43caa466 UH |
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 | ||
2d237f3c ML |
41 | g_variant_get(g_hash_table_lookup(options, "factor"), "(xt)", |
42 | &ctx->factor.p, &ctx->factor.q); | |
43caa466 UH |
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; | |
edb691fc | 52 | const struct sr_datafeed_analog *analog; |
43caa466 UH |
53 | |
54 | if (!t || !t->sdi || !packet_in || !packet_out) | |
55 | return SR_ERR_ARG; | |
56 | ctx = t->priv; | |
57 | ||
58 | switch (packet_in->type) { | |
edb691fc UH |
59 | case SR_DF_ANALOG: |
60 | analog = packet_in->payload; | |
61 | analog->encoding->scale.p *= ctx->factor.p; | |
62 | analog->encoding->scale.q *= ctx->factor.q; | |
b1aa4f34 | 63 | break; |
43caa466 UH |
64 | default: |
65 | sr_spew("Unsupported packet type %d, ignoring.", packet_in->type); | |
66 | break; | |
67 | } | |
68 | ||
69 | /* Return the in-place-modified packet. */ | |
70 | *packet_out = packet_in; | |
71 | ||
72 | return SR_OK; | |
73 | } | |
74 | ||
75 | static int cleanup(struct sr_transform *t) | |
76 | { | |
77 | struct context *ctx; | |
78 | ||
79 | if (!t || !t->sdi) | |
80 | return SR_ERR_ARG; | |
81 | ctx = t->priv; | |
82 | ||
83 | g_free(ctx); | |
84 | t->priv = NULL; | |
85 | ||
86 | return SR_OK; | |
87 | } | |
88 | ||
89 | static struct sr_option options[] = { | |
90 | { "factor", "Factor", "Factor by which to scale the analog values", NULL, NULL }, | |
91 | ALL_ZERO | |
92 | }; | |
93 | ||
94 | static const struct sr_option *get_options(void) | |
95 | { | |
2d237f3c ML |
96 | int64_t p = 1; |
97 | uint64_t q = 1; | |
98 | ||
43caa466 UH |
99 | /* Default to a scaling factor of 1.0. */ |
100 | if (!options[0].def) | |
a73665a3 | 101 | options[0].def = g_variant_ref_sink(g_variant_new("(xt)", &p, &q)); |
43caa466 UH |
102 | |
103 | return options; | |
104 | } | |
105 | ||
106 | SR_PRIV struct sr_transform_module transform_scale = { | |
107 | .id = "scale", | |
108 | .name = "Scale", | |
109 | .desc = "Scale analog values by a specified factor", | |
110 | .options = get_options, | |
111 | .init = init, | |
112 | .receive = receive, | |
113 | .cleanup = cleanup, | |
114 | }; |