1/**************************************************************************/
2/* resource_importer_wav.h */
3/**************************************************************************/
4/* This file is part of: */
5/* GODOT ENGINE */
6/* https://godotengine.org */
7/**************************************************************************/
8/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
9/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
10/* */
11/* Permission is hereby granted, free of charge, to any person obtaining */
12/* a copy of this software and associated documentation files (the */
13/* "Software"), to deal in the Software without restriction, including */
14/* without limitation the rights to use, copy, modify, merge, publish, */
15/* distribute, sublicense, and/or sell copies of the Software, and to */
16/* permit persons to whom the Software is furnished to do so, subject to */
17/* the following conditions: */
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19/* The above copyright notice and this permission notice shall be */
20/* included in all copies or substantial portions of the Software. */
21/* */
22/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
23/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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27/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
28/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
29/**************************************************************************/
30
31#ifndef RESOURCE_IMPORTER_WAV_H
32#define RESOURCE_IMPORTER_WAV_H
33
34#include "core/io/resource_importer.h"
35
36class ResourceImporterWAV : public ResourceImporter {
37 GDCLASS(ResourceImporterWAV, ResourceImporter);
38
39public:
40 virtual String get_importer_name() const override;
41 virtual String get_visible_name() const override;
42 virtual void get_recognized_extensions(List<String> *p_extensions) const override;
43 virtual String get_save_extension() const override;
44 virtual String get_resource_type() const override;
45
46 virtual int get_preset_count() const override;
47 virtual String get_preset_name(int p_idx) const override;
48
49 virtual void get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset = 0) const override;
50 virtual bool get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const override;
51
52 static void _compress_ima_adpcm(const Vector<float> &p_data, Vector<uint8_t> &dst_data) {
53 static const int16_t _ima_adpcm_step_table[89] = {
54 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
55 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
56 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
57 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
58 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
59 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
60 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
61 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
62 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
63 };
64
65 static const int8_t _ima_adpcm_index_table[16] = {
66 -1, -1, -1, -1, 2, 4, 6, 8,
67 -1, -1, -1, -1, 2, 4, 6, 8
68 };
69
70 int datalen = p_data.size();
71 int datamax = datalen;
72 if (datalen & 1) {
73 datalen++;
74 }
75
76 dst_data.resize(datalen / 2 + 4);
77 uint8_t *w = dst_data.ptrw();
78
79 int i, step_idx = 0, prev = 0;
80 uint8_t *out = w;
81 const float *in = p_data.ptr();
82
83 // Initial value is zero.
84 *(out++) = 0;
85 *(out++) = 0;
86 // Table index initial value.
87 *(out++) = 0;
88 // Unused.
89 *(out++) = 0;
90
91 for (i = 0; i < datalen; i++) {
92 int step, diff, vpdiff, mask;
93 uint8_t nibble;
94 int16_t xm_sample;
95
96 if (i >= datamax) {
97 xm_sample = 0;
98 } else {
99 xm_sample = CLAMP(in[i] * 32767.0, -32768, 32767);
100 }
101
102 diff = (int)xm_sample - prev;
103
104 nibble = 0;
105 step = _ima_adpcm_step_table[step_idx];
106 vpdiff = step >> 3;
107 if (diff < 0) {
108 nibble = 8;
109 diff = -diff;
110 }
111 mask = 4;
112 while (mask) {
113 if (diff >= step) {
114 nibble |= mask;
115 diff -= step;
116 vpdiff += step;
117 }
118
119 step >>= 1;
120 mask >>= 1;
121 }
122
123 if (nibble & 8) {
124 prev -= vpdiff;
125 } else {
126 prev += vpdiff;
127 }
128
129 prev = CLAMP(prev, -32768, 32767);
130
131 step_idx += _ima_adpcm_index_table[nibble];
132 step_idx = CLAMP(step_idx, 0, 88);
133
134 if (i & 1) {
135 *out |= nibble << 4;
136 out++;
137 } else {
138 *out = nibble;
139 }
140 }
141 }
142
143 virtual Error import(const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files = nullptr, Variant *r_metadata = nullptr) override;
144
145 ResourceImporterWAV();
146};
147
148#endif // RESOURCE_IMPORTER_WAV_H
149