diff options
Diffstat (limited to 'apps/plugins/sdl/src/audio/SDL_mixer.c')
-rw-r--r-- | apps/plugins/sdl/src/audio/SDL_mixer.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/audio/SDL_mixer.c b/apps/plugins/sdl/src/audio/SDL_mixer.c new file mode 100644 index 0000000000..b5d4d8bf80 --- /dev/null +++ b/apps/plugins/sdl/src/audio/SDL_mixer.c | |||
@@ -0,0 +1,264 @@ | |||
1 | /* | ||
2 | SDL - Simple DirectMedia Layer | ||
3 | Copyright (C) 1997-2012 Sam Lantinga | ||
4 | |||
5 | This library is free software; you can redistribute it and/or | ||
6 | modify it under the terms of the GNU Lesser General Public | ||
7 | License as published by the Free Software Foundation; either | ||
8 | version 2.1 of the License, or (at your option) any later version. | ||
9 | |||
10 | This library is distributed in the hope that it will be useful, | ||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Lesser General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Lesser General Public | ||
16 | License along with this library; if not, write to the Free Software | ||
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
18 | |||
19 | Sam Lantinga | ||
20 | slouken@libsdl.org | ||
21 | */ | ||
22 | #include "SDL_config.h" | ||
23 | |||
24 | /* This provides the default mixing callback for the SDL audio routines */ | ||
25 | |||
26 | #include "SDL_cpuinfo.h" | ||
27 | #include "SDL_timer.h" | ||
28 | #include "SDL_audio.h" | ||
29 | #include "SDL_sysaudio.h" | ||
30 | #include "SDL_mixer_MMX.h" | ||
31 | #include "SDL_mixer_MMX_VC.h" | ||
32 | #include "SDL_mixer_m68k.h" | ||
33 | |||
34 | /* This table is used to add two sound values together and pin | ||
35 | * the value to avoid overflow. (used with permission from ARDI) | ||
36 | * Changed to use 0xFE instead of 0xFF for better sound quality. | ||
37 | */ | ||
38 | static const Uint8 mix8[] = | ||
39 | { | ||
40 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
41 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
42 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
43 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
44 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
45 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
46 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
47 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
48 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
49 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
50 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
51 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, | ||
52 | 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, | ||
53 | 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | ||
54 | 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, | ||
55 | 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, | ||
56 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, | ||
57 | 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, | ||
58 | 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, | ||
59 | 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, | ||
60 | 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, | ||
61 | 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, | ||
62 | 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, | ||
63 | 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | ||
64 | 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, | ||
65 | 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, | ||
66 | 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, | ||
67 | 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, | ||
68 | 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, | ||
69 | 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, | ||
70 | 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, | ||
71 | 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, | ||
72 | 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, | ||
73 | 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, | ||
74 | 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE, | ||
75 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
76 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
77 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
78 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
79 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
80 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
81 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
82 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
83 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
84 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
85 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | ||
86 | 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE | ||
87 | }; | ||
88 | |||
89 | /* The volume ranges from 0 - 128 */ | ||
90 | #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) | ||
91 | #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) | ||
92 | |||
93 | void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume) | ||
94 | { | ||
95 | Uint16 format; | ||
96 | |||
97 | if ( volume == 0 ) { | ||
98 | return; | ||
99 | } | ||
100 | /* Mix the user-level audio format */ | ||
101 | if ( current_audio ) { | ||
102 | if ( current_audio->convert.needed ) { | ||
103 | format = current_audio->convert.src_format; | ||
104 | } else { | ||
105 | format = current_audio->spec.format; | ||
106 | } | ||
107 | } else { | ||
108 | /* HACK HACK HACK */ | ||
109 | format = AUDIO_S16; | ||
110 | } | ||
111 | switch (format) { | ||
112 | |||
113 | case AUDIO_U8: { | ||
114 | #if defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__)) && defined(SDL_ASSEMBLY_ROUTINES) | ||
115 | SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8); | ||
116 | #else | ||
117 | Uint8 src_sample; | ||
118 | |||
119 | while ( len-- ) { | ||
120 | src_sample = *src; | ||
121 | ADJUST_VOLUME_U8(src_sample, volume); | ||
122 | *dst = mix8[*dst+src_sample]; | ||
123 | ++dst; | ||
124 | ++src; | ||
125 | } | ||
126 | #endif | ||
127 | } | ||
128 | break; | ||
129 | |||
130 | case AUDIO_S8: { | ||
131 | #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ | ||
132 | #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) | ||
133 | if (SDL_HasMMX()) | ||
134 | { | ||
135 | SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); | ||
136 | } | ||
137 | else | ||
138 | #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) | ||
139 | if (SDL_HasMMX()) | ||
140 | { | ||
141 | SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); | ||
142 | } | ||
143 | else | ||
144 | #endif | ||
145 | #endif | ||
146 | |||
147 | #if defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__)) && defined(SDL_ASSEMBLY_ROUTINES) | ||
148 | SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume); | ||
149 | #else | ||
150 | { | ||
151 | Sint8 *dst8, *src8; | ||
152 | Sint8 src_sample; | ||
153 | int dst_sample; | ||
154 | const int max_audioval = ((1<<(8-1))-1); | ||
155 | const int min_audioval = -(1<<(8-1)); | ||
156 | |||
157 | src8 = (Sint8 *)src; | ||
158 | dst8 = (Sint8 *)dst; | ||
159 | while ( len-- ) { | ||
160 | src_sample = *src8; | ||
161 | ADJUST_VOLUME(src_sample, volume); | ||
162 | dst_sample = *dst8 + src_sample; | ||
163 | if ( dst_sample > max_audioval ) { | ||
164 | *dst8 = max_audioval; | ||
165 | } else | ||
166 | if ( dst_sample < min_audioval ) { | ||
167 | *dst8 = min_audioval; | ||
168 | } else { | ||
169 | *dst8 = dst_sample; | ||
170 | } | ||
171 | ++dst8; | ||
172 | ++src8; | ||
173 | } | ||
174 | } | ||
175 | #endif | ||
176 | } | ||
177 | break; | ||
178 | |||
179 | case AUDIO_S16LSB: { | ||
180 | #if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ | ||
181 | #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) | ||
182 | if (SDL_HasMMX()) | ||
183 | { | ||
184 | SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); | ||
185 | } | ||
186 | else | ||
187 | #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) | ||
188 | if (SDL_HasMMX()) | ||
189 | { | ||
190 | SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); | ||
191 | } | ||
192 | else | ||
193 | #endif | ||
194 | #endif | ||
195 | |||
196 | #if defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__)) && defined(SDL_ASSEMBLY_ROUTINES) | ||
197 | SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); | ||
198 | #else | ||
199 | { | ||
200 | Sint16 src1, src2; | ||
201 | int dst_sample; | ||
202 | const int max_audioval = ((1<<(16-1))-1); | ||
203 | const int min_audioval = -(1<<(16-1)); | ||
204 | |||
205 | len /= 2; | ||
206 | while ( len-- ) { | ||
207 | src1 = ((src[1])<<8|src[0]); | ||
208 | ADJUST_VOLUME(src1, volume); | ||
209 | src2 = ((dst[1])<<8|dst[0]); | ||
210 | src += 2; | ||
211 | dst_sample = src1+src2; | ||
212 | if ( dst_sample > max_audioval ) { | ||
213 | dst_sample = max_audioval; | ||
214 | } else | ||
215 | if ( dst_sample < min_audioval ) { | ||
216 | dst_sample = min_audioval; | ||
217 | } | ||
218 | dst[0] = dst_sample&0xFF; | ||
219 | dst_sample >>= 8; | ||
220 | dst[1] = dst_sample&0xFF; | ||
221 | dst += 2; | ||
222 | } | ||
223 | } | ||
224 | #endif | ||
225 | } | ||
226 | break; | ||
227 | |||
228 | case AUDIO_S16MSB: { | ||
229 | #if defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__)) && defined(SDL_ASSEMBLY_ROUTINES) | ||
230 | SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); | ||
231 | #else | ||
232 | Sint16 src1, src2; | ||
233 | int dst_sample; | ||
234 | const int max_audioval = ((1<<(16-1))-1); | ||
235 | const int min_audioval = -(1<<(16-1)); | ||
236 | |||
237 | len /= 2; | ||
238 | while ( len-- ) { | ||
239 | src1 = ((src[0])<<8|src[1]); | ||
240 | ADJUST_VOLUME(src1, volume); | ||
241 | src2 = ((dst[0])<<8|dst[1]); | ||
242 | src += 2; | ||
243 | dst_sample = src1+src2; | ||
244 | if ( dst_sample > max_audioval ) { | ||
245 | dst_sample = max_audioval; | ||
246 | } else | ||
247 | if ( dst_sample < min_audioval ) { | ||
248 | dst_sample = min_audioval; | ||
249 | } | ||
250 | dst[1] = dst_sample&0xFF; | ||
251 | dst_sample >>= 8; | ||
252 | dst[0] = dst_sample&0xFF; | ||
253 | dst += 2; | ||
254 | } | ||
255 | #endif | ||
256 | } | ||
257 | break; | ||
258 | |||
259 | default: /* If this happens... FIXME! */ | ||
260 | SDL_SetError("SDL_MixAudio(): unknown audio format"); | ||
261 | return; | ||
262 | } | ||
263 | } | ||
264 | |||