1 /*
2 * Sweep, a sound wave editor.
3 *
4 * Copyright (C) 2000 Conrad Parker
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 #include <stdio.h>
22 #include <string.h>
23 #include <gdk/gdkkeysyms.h>
24
25 #include <sweep/sweep.h>
26
27
28 #define NR_PARAMS 2
29
30 #ifndef __GNUC__
31 #error GCCisms used here. Please report this error to \
32 sweep-devel@lists.sourceforge.net stating your versions of sweep \
33 and your operating system and compiler.
34 #endif
35
36
37 static sw_param_range delay_range = {
38 SW_RANGE_LOWER_BOUND_VALID|SW_RANGE_STEP_VALID,
39 lower: {f: 0.0},
40 step: {f: 0.001}
41 };
42
43 static sw_param_range gain_range = {
44 SW_RANGE_ALL_VALID,
45 lower: {f: 0.0},
46 upper: {f: 1.0},
47 step: {f: 0.01}
48 };
49
50
51 static sw_param_spec param_specs[] = {
52 {
53 N_("Delay"),
54 N_("Time to delay by"),
55 SWEEP_TYPE_FLOAT,
56 SW_PARAM_CONSTRAINED_RANGE,
57 {range: &delay_range},
58 SW_PARAM_HINT_TIME
59 },
60 {
61 N_("Gain"),
62 N_("Gain with which to mix in delayed signal"),
63 SWEEP_TYPE_FLOAT,
64 SW_PARAM_CONSTRAINED_RANGE,
65 {range: &gain_range},
66 SW_PARAM_HINT_DEFAULT
67 },
68 };
69
70 static void
echo_suggest(sw_sample * sample,sw_param_set pset,gpointer custom_data)71 echo_suggest (sw_sample * sample, sw_param_set pset, gpointer custom_data)
72 {
73 pset[0].f = 0.0;
74 pset[1].f = 0.0;
75 }
76
77 static void
region_echo(gpointer data,sw_format * format,sw_framecount_t nr_frames,sw_param_set pset,gpointer custom_data)78 region_echo (gpointer data, sw_format * format, sw_framecount_t nr_frames,
79 sw_param_set pset, gpointer custom_data)
80 {
81 gfloat delay = pset[0].f;
82 gfloat gain = pset[1].f;
83
84 sw_framecount_t i, delay_f, dlen_s;
85 sw_audio_t * d, * e;
86 gpointer ep;
87
88 delay_f = time_to_frames (format, delay);
89
90 d = (sw_audio_t *)data;
91 ep = data + frames_to_bytes (format, delay_f);
92 e = (sw_audio_t *)ep;
93
94 if (delay > nr_frames) return;
95
96 dlen_s = frames_to_samples (format, nr_frames - delay_f);
97
98 for (i = 0; i < dlen_s; i++) {
99 e[i] += (sw_audio_t)((gfloat)(d[i]) * gain);
100 }
101 }
102
103 static sw_op_instance *
echo_apply(sw_sample * sample,sw_param_set pset,gpointer custom_data)104 echo_apply (sw_sample * sample, sw_param_set pset, gpointer custom_data)
105 {
106 return
107 perform_filter_region_op (sample, _("Echo"),
108 (SweepFilterRegion)region_echo, pset, NULL);
109 }
110
111
112 static sw_procedure proc_echo = {
113 N_("Echo"),
114 N_("Apply an echo to selected regions of a sample"),
115 "Conrad Parker",
116 "Copyright (C) 2000",
117 "http://sweep.sourceforge.net/plugins/echo",
118 "Filters/Echo", /* identifier */
119 GDK_e, /* accel_key */
120 GDK_SHIFT_MASK, /* accel_mods */
121 NR_PARAMS, /* nr_params */
122 param_specs, /* param_specs */
123 echo_suggest, /* suggests() */
124 echo_apply,
125 NULL, /* custom_data */
126 };
127
128 static GList *
echo_init(void)129 echo_init (void)
130 {
131 return g_list_append ((GList *)NULL, &proc_echo);
132 }
133
134
135 sw_plugin plugin = {
136 echo_init, /* plugin_init */
137 NULL, /* plugin_cleanup */
138 };
139