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comparison src/audio/SDL_mixer.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
comparison
equal deleted inserted replaced
1667:1fddae038bc8 1668:4da1ee79c9af
88 /* The volume ranges from 0 - 128 */ 88 /* The volume ranges from 0 - 128 */
89 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) 89 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME)
90 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) 90 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128)
91 91
92 void 92 void
93 SDL_MixAudio (Uint8 * dst, const Uint8 * src, Uint32 len, int volume) 93 SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
94 { 94 {
95 Uint16 format; 95 Uint16 format;
96 96
97 if (volume == 0) { 97 if (volume == 0) {
98 return; 98 return;
111 switch (format) { 111 switch (format) {
112 112
113 case AUDIO_U8: 113 case AUDIO_U8:
114 { 114 {
115 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) 115 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
116 SDL_MixAudio_m68k_U8 ((char *) dst, (char *) src, 116 SDL_MixAudio_m68k_U8((char *) dst, (char *) src,
117 (unsigned long) len, (long) volume, 117 (unsigned long) len, (long) volume,
118 (char *) mix8); 118 (char *) mix8);
119 #else 119 #else
120 Uint8 src_sample; 120 Uint8 src_sample;
121 121
122 while (len--) { 122 while (len--) {
123 src_sample = *src; 123 src_sample = *src;
124 ADJUST_VOLUME_U8 (src_sample, volume); 124 ADJUST_VOLUME_U8(src_sample, volume);
125 *dst = mix8[*dst + src_sample]; 125 *dst = mix8[*dst + src_sample];
126 ++dst; 126 ++dst;
127 ++src; 127 ++src;
128 } 128 }
129 #endif 129 #endif
131 break; 131 break;
132 132
133 case AUDIO_S8: 133 case AUDIO_S8:
134 { 134 {
135 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) 135 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
136 if (SDL_HasMMX ()) { 136 if (SDL_HasMMX()) {
137 SDL_MixAudio_MMX_S8 ((char *) dst, (char *) src, 137 SDL_MixAudio_MMX_S8((char *) dst, (char *) src,
138 (unsigned int) len, (int) volume); 138 (unsigned int) len, (int) volume);
139 } else 139 } else
140 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) 140 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
141 if (SDL_HasMMX ()) { 141 if (SDL_HasMMX()) {
142 SDL_MixAudio_MMX_S8_VC ((char *) dst, (char *) src, 142 SDL_MixAudio_MMX_S8_VC((char *) dst, (char *) src,
143 (unsigned int) len, (int) volume); 143 (unsigned int) len, (int) volume);
144 } else 144 } else
145 #endif 145 #endif
146 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) 146 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
147 SDL_MixAudio_m68k_S8 ((char *) dst, (char *) src, 147 SDL_MixAudio_m68k_S8((char *) dst, (char *) src,
148 (unsigned long) len, (long) volume); 148 (unsigned long) len, (long) volume);
149 #else 149 #else
150 { 150 {
151 Sint8 *dst8, *src8; 151 Sint8 *dst8, *src8;
152 Sint8 src_sample; 152 Sint8 src_sample;
153 int dst_sample; 153 int dst_sample;
156 156
157 src8 = (Sint8 *) src; 157 src8 = (Sint8 *) src;
158 dst8 = (Sint8 *) dst; 158 dst8 = (Sint8 *) dst;
159 while (len--) { 159 while (len--) {
160 src_sample = *src8; 160 src_sample = *src8;
161 ADJUST_VOLUME (src_sample, volume); 161 ADJUST_VOLUME(src_sample, volume);
162 dst_sample = *dst8 + src_sample; 162 dst_sample = *dst8 + src_sample;
163 if (dst_sample > max_audioval) { 163 if (dst_sample > max_audioval) {
164 *dst8 = max_audioval; 164 *dst8 = max_audioval;
165 } else if (dst_sample < min_audioval) { 165 } else if (dst_sample < min_audioval) {
166 *dst8 = min_audioval; 166 *dst8 = min_audioval;
176 break; 176 break;
177 177
178 case AUDIO_S16LSB: 178 case AUDIO_S16LSB:
179 { 179 {
180 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) 180 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
181 if (SDL_HasMMX ()) { 181 if (SDL_HasMMX()) {
182 SDL_MixAudio_MMX_S16 ((char *) dst, (char *) src, 182 SDL_MixAudio_MMX_S16((char *) dst, (char *) src,
183 (unsigned int) len, (int) volume); 183 (unsigned int) len, (int) volume);
184 } else 184 } else
185 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) 185 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES)
186 if (SDL_HasMMX ()) { 186 if (SDL_HasMMX()) {
187 SDL_MixAudio_MMX_S16_VC ((char *) dst, (char *) src, 187 SDL_MixAudio_MMX_S16_VC((char *) dst, (char *) src,
188 (unsigned int) len, (int) volume); 188 (unsigned int) len, (int) volume);
189 } else 189 } else
190 #endif 190 #endif
191 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) 191 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
192 SDL_MixAudio_m68k_S16LSB ((short *) dst, (short *) src, 192 SDL_MixAudio_m68k_S16LSB((short *) dst, (short *) src,
193 (unsigned long) len, (long) volume); 193 (unsigned long) len, (long) volume);
194 #else 194 #else
195 { 195 {
196 Sint16 src1, src2; 196 Sint16 src1, src2;
197 int dst_sample; 197 int dst_sample;
198 const int max_audioval = ((1 << (16 - 1)) - 1); 198 const int max_audioval = ((1 << (16 - 1)) - 1);
199 const int min_audioval = -(1 << (16 - 1)); 199 const int min_audioval = -(1 << (16 - 1));
200 200
201 len /= 2; 201 len /= 2;
202 while (len--) { 202 while (len--) {
203 src1 = ((src[1]) << 8 | src[0]); 203 src1 = ((src[1]) << 8 | src[0]);
204 ADJUST_VOLUME (src1, volume); 204 ADJUST_VOLUME(src1, volume);
205 src2 = ((dst[1]) << 8 | dst[0]); 205 src2 = ((dst[1]) << 8 | dst[0]);
206 src += 2; 206 src += 2;
207 dst_sample = src1 + src2; 207 dst_sample = src1 + src2;
208 if (dst_sample > max_audioval) { 208 if (dst_sample > max_audioval) {
209 dst_sample = max_audioval; 209 dst_sample = max_audioval;
221 break; 221 break;
222 222
223 case AUDIO_S16MSB: 223 case AUDIO_S16MSB:
224 { 224 {
225 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) 225 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES)
226 SDL_MixAudio_m68k_S16MSB ((short *) dst, (short *) src, 226 SDL_MixAudio_m68k_S16MSB((short *) dst, (short *) src,
227 (unsigned long) len, (long) volume); 227 (unsigned long) len, (long) volume);
228 #else 228 #else
229 Sint16 src1, src2; 229 Sint16 src1, src2;
230 int dst_sample; 230 int dst_sample;
231 const int max_audioval = ((1 << (16 - 1)) - 1); 231 const int max_audioval = ((1 << (16 - 1)) - 1);
232 const int min_audioval = -(1 << (16 - 1)); 232 const int min_audioval = -(1 << (16 - 1));
233 233
234 len /= 2; 234 len /= 2;
235 while (len--) { 235 while (len--) {
236 src1 = ((src[0]) << 8 | src[1]); 236 src1 = ((src[0]) << 8 | src[1]);
237 ADJUST_VOLUME (src1, volume); 237 ADJUST_VOLUME(src1, volume);
238 src2 = ((dst[0]) << 8 | dst[1]); 238 src2 = ((dst[0]) << 8 | dst[1]);
239 src += 2; 239 src += 2;
240 dst_sample = src1 + src2; 240 dst_sample = src1 + src2;
241 if (dst_sample > max_audioval) { 241 if (dst_sample > max_audioval) {
242 dst_sample = max_audioval; 242 dst_sample = max_audioval;
251 #endif 251 #endif
252 } 252 }
253 break; 253 break;
254 254
255 default: /* If this happens... FIXME! */ 255 default: /* If this happens... FIXME! */
256 SDL_SetError ("SDL_MixAudio(): unknown audio format"); 256 SDL_SetError("SDL_MixAudio(): unknown audio format");
257 return; 257 return;
258 } 258 }
259 } 259 }
260 260
261 /* vi: set ts=4 sw=4 expandtab: */ 261 /* vi: set ts=4 sw=4 expandtab: */