e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 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 | /* Allow access to a raw mixing buffer */ |
25 | #include <nds.h> |
26 | #include "SDL.h" |
27 | #include "SDL_endian.h" |
28 | #include "SDL_timer.h" |
29 | #include "SDL_audio.h" |
30 | #include "../SDL_audiomem.h" |
31 | #include "../SDL_audio_c.h" |
32 | #include "SDL_ndsaudio.h" |
33 | #include "soundcommon.h" |
34 | |
35 | |
36 | /* Audio driver functions */ |
37 | static int NDS_OpenAudio(_THIS, SDL_AudioSpec *spec); |
38 | static void NDS_WaitAudio(_THIS); |
39 | static void NDS_PlayAudio(_THIS); |
40 | static Uint8 *NDS_GetAudioBuf(_THIS); |
41 | static void NDS_CloseAudio(_THIS); |
42 | |
43 | /* Audio driver bootstrap functions */ |
44 | |
45 | u32 framecounter = 0,soundoffset = 0; |
46 | static SDL_AudioDevice *sdl_nds_audiodevice; |
47 | |
48 | //void SoundMixCallback(void *stream,u32 size) |
49 | //{ |
50 | // //printf("SoundMixCallback\n"); |
51 | // |
52 | // Uint8 *buffer; |
53 | // |
54 | // buffer = sdl_nds_audiodevice->hidden->mixbuf; |
55 | // memset(buffer, sdl_nds_audiodevice->spec.silence, size); |
56 | // |
57 | // if (!sdl_nds_audiodevice->paused){ |
58 | // |
59 | // |
60 | // //if (sdl_nds_audiodevice->convert.needed) { |
61 | // // int silence; |
62 | // |
63 | // // if (sdl_nds_audiodevice->convert.src_format == AUDIO_U8 ) { |
64 | // // silence = 0x80; |
65 | // // } else { |
66 | // // silence = 0; |
67 | // // } |
68 | // // memset(sdl_nds_audiodevice->convert.buf, silence, sdl_nds_audiodevice->convert.len); |
69 | // // sdl_nds_audiodevice->spec.callback(sdl_nds_audiodevice->spec.userdata, |
70 | // // (Uint8 *)sdl_nds_audiodevice->convert.buf,sdl_nds_audiodevice->convert.len); |
71 | // // SDL_ConvertAudio(&sdl_nds_audiodevice->convert); |
72 | // // memcpy(buffer, sdl_nds_audiodevice->convert.buf, sdl_nds_audiodevice->convert.len_cvt); |
73 | // //} else |
74 | // { |
75 | // sdl_nds_audiodevice->spec.callback(sdl_nds_audiodevice->spec.userdata, buffer, size); |
76 | // //memcpy((Sint16 *)stream,buffer, size); |
77 | // } |
78 | // |
79 | // } |
80 | // |
81 | // if(soundsystem->format == 8) |
82 | // { |
83 | // int i; |
84 | // s32 *buffer32 = (s32 *)buffer; |
85 | // s32 *stream32 = (s32 *)stream; |
86 | // for(i=0;i<size/4;i++){ *stream32++ = buffer32[i] ^ 0x80808080;} |
87 | // //for(i = 0; i < size; i++) |
88 | // // ((s8*)stream)[i]=(buffer[i]^0x80); |
89 | // } |
90 | // else |
91 | // { |
92 | // int i; |
93 | // for(i = 0; i < size; i++){ |
94 | // //((short*)stream)[i] =(short)buffer[i] << 8; // sound 8bit ---> buffer 16bit |
95 | // //if (buffer[i] &0x80) |
96 | // //((Sint16*)stream)[i] = 0xff00 | buffer[i]; |
97 | // ((Sint16*)stream)[i] = (buffer[i] - 128) << 8; |
98 | // |
99 | // //else |
100 | // // ((Sint16*)stream)[i] = buffer[i]; |
101 | // } |
102 | // //register signed char *pSrc =buffer; |
103 | // //register short *pDest =stream; |
104 | // //int x; |
105 | // // for (x=size; x>0; x--) |
106 | // // { |
107 | // // register short temp = (((short)*pSrc)-128)<<8; |
108 | // // pSrc++; |
109 | // // *pDest++ = temp; |
110 | // // } |
111 | // |
112 | // //memcpy((Sint16 *)stream,buffer, size); |
113 | // } |
114 | //} |
115 | |
116 | void SoundMixCallback(void *stream,u32 len) |
117 | { |
118 | SDL_AudioDevice *audio = (SDL_AudioDevice *)sdl_nds_audiodevice; |
119 | |
120 | /* Silence the buffer, since it's ours */ |
121 | SDL_memset(stream, audio->spec.silence, len); |
122 | |
123 | /* Only do soemthing if audio is enabled */ |
124 | if ( ! audio->enabled ) |
125 | return; |
126 | |
127 | if ( ! audio->paused ) { |
128 | if ( audio->convert.needed ) { |
129 | //fprintf(stderr,"converting audio\n"); |
130 | SDL_mutexP(audio->mixer_lock); |
131 | (*audio->spec.callback)(audio->spec.userdata, |
132 | (Uint8 *)audio->convert.buf,audio->convert.len); |
133 | SDL_mutexV(audio->mixer_lock); |
134 | SDL_ConvertAudio(&audio->convert); |
135 | SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt); |
136 | } else { |
137 | SDL_mutexP(audio->mixer_lock); |
138 | (*audio->spec.callback)(audio->spec.userdata, |
139 | (Uint8 *)stream, len); |
140 | SDL_mutexV(audio->mixer_lock); |
141 | } |
142 | } |
143 | return; |
144 | } |
145 | void MixSound(void) |
146 | { |
147 | int remain; |
148 | |
149 | if(soundsystem->format == 8) |
150 | { |
151 | if((soundsystem->soundcursor + soundsystem->numsamples) > soundsystem->buffersize) |
152 | { |
153 | SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor],soundsystem->buffersize - soundsystem->soundcursor); |
154 | remain = soundsystem->numsamples - (soundsystem->buffersize - soundsystem->soundcursor); |
155 | SoundMixCallback(soundsystem->mixbuffer,remain); |
156 | } |
157 | else |
158 | { |
159 | SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor],soundsystem->numsamples); |
160 | } |
161 | } |
162 | else |
163 | { |
164 | if((soundsystem->soundcursor + soundsystem->numsamples) > (soundsystem->buffersize >> 1)) |
165 | { |
166 | SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor << 1],(soundsystem->buffersize >> 1) - soundsystem->soundcursor); |
167 | remain = soundsystem->numsamples - ((soundsystem->buffersize >> 1) - soundsystem->soundcursor); |
168 | SoundMixCallback(soundsystem->mixbuffer,remain); |
169 | } |
170 | else |
171 | { |
172 | SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor << 1],soundsystem->numsamples); |
173 | } |
174 | } |
175 | } |
176 | |
177 | void InterruptHandler(void) |
178 | { |
179 | framecounter++; |
180 | } |
181 | void FiFoHandler(void) |
182 | { |
183 | u32 command; |
184 | while ( !(REG_IPC_FIFO_CR & (IPC_FIFO_RECV_EMPTY)) ) |
185 | { |
186 | command = REG_IPC_FIFO_RX; |
187 | |
188 | switch(command) |
189 | { |
190 | case FIFO_NONE: |
191 | break; |
192 | case UPDATEON_ARM9: |
193 | REG_IME = 0; |
194 | MixSound(); |
195 | REG_IME = 1; |
196 | SendCommandToArm7(MIXCOMPLETE_ONARM9); |
197 | break; |
198 | } |
199 | } |
200 | } |
201 | |
202 | |
203 | |
204 | |
205 | |
206 | static int Audio_Available(void) |
207 | { |
208 | return(1); |
209 | } |
210 | |
211 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
212 | { |
213 | } |
214 | |
215 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
216 | { |
217 | |
218 | SDL_AudioDevice *this; |
219 | |
220 | /* Initialize all variables that we clean on shutdown */ |
221 | this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
222 | if ( this ) { |
223 | SDL_memset(this, 0, (sizeof *this)); |
224 | this->hidden = (struct SDL_PrivateAudioData *) |
225 | SDL_malloc((sizeof *this->hidden)); |
226 | } |
227 | if ( (this == NULL) || (this->hidden == NULL) ) { |
228 | SDL_OutOfMemory(); |
229 | if ( this ) { |
230 | SDL_free(this); |
231 | } |
232 | return(0); |
233 | } |
234 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
235 | |
236 | /* Set the function pointers */ |
237 | this->OpenAudio = NDS_OpenAudio; |
238 | this->WaitAudio = NDS_WaitAudio; |
239 | this->PlayAudio = NDS_PlayAudio; |
240 | this->GetAudioBuf = NDS_GetAudioBuf; |
241 | this->CloseAudio = NDS_CloseAudio; |
242 | |
243 | this->free = Audio_DeleteDevice; |
244 | //fprintf(stderr,"Audio_CreateDevice\n"); |
245 | return this; |
246 | } |
247 | |
248 | AudioBootStrap NDSAUD_bootstrap = { |
249 | "nds", "NDS audio", |
250 | Audio_Available, Audio_CreateDevice |
251 | }; |
252 | |
253 | |
254 | void static NDS_WaitAudio(_THIS) |
255 | { |
256 | //printf("NDS_WaitAudio\n"); |
257 | } |
258 | |
259 | static void NDS_PlayAudio(_THIS) |
260 | { |
261 | //printf("playing audio\n"); |
262 | if (this->paused) |
263 | return; |
264 | |
265 | } |
266 | |
267 | static Uint8 *NDS_GetAudioBuf(_THIS) |
268 | { |
269 | return NULL;//(this->hidden->mixbuf); |
270 | } |
271 | |
272 | static void NDS_CloseAudio(_THIS) |
273 | { |
274 | /* if ( this->hidden->mixbuf != NULL ) { |
275 | SDL_FreeAudioMem(this->hidden->mixbuf); |
276 | this->hidden->mixbuf = NULL; |
277 | }*/ |
278 | } |
279 | |
280 | static int NDS_OpenAudio(_THIS, SDL_AudioSpec *spec) |
281 | { |
282 | //printf("NDS_OpenAudio\n"); |
283 | int format = 0; |
284 | //switch(spec->format&0xff) { |
285 | //case 8: spec->format = AUDIO_S8;format=8; break; |
286 | //case 16: spec->format = AUDIO_S16LSB;format=16; break; |
287 | //default: |
288 | // SDL_SetError("Unsupported audio format"); |
289 | // return(-1); |
290 | //} |
291 | switch (spec->format&~0x1000) { |
292 | case AUDIO_S8: |
293 | /* Signed 8-bit audio supported */ |
294 | format=8; |
295 | break; |
296 | case AUDIO_U8: |
297 | spec->format ^= 0x80;format=8; |
298 | break; |
299 | case AUDIO_U16: |
300 | /* Unsigned 16-bit audio unsupported, convert to S16 */ |
301 | spec->format ^=0x8000;format=16; |
302 | case AUDIO_S16: |
303 | /* Signed 16-bit audio supported */ |
304 | format=16; |
305 | break; |
306 | } |
307 | /* Update the fragment size as size in bytes */ |
308 | SDL_CalculateAudioSpec(spec); |
309 | |
310 | /* Allocate mixing buffer */ |
311 | //this->hidden->mixlen = spec->size; |
312 | //this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
313 | //if ( this->hidden->mixbuf == NULL ) { |
314 | // SDL_SetError("Out of Memory"); |
315 | // return(-1); |
316 | //} |
317 | |
318 | SDL_NDSAudio_mutex = 0; |
319 | sdl_nds_audiodevice=this; |
320 | |
321 | irqInit(); |
322 | irqSet(IRQ_VBLANK,&InterruptHandler); |
323 | irqSet(IRQ_FIFO_NOT_EMPTY,&FiFoHandler); |
324 | irqEnable(IRQ_FIFO_NOT_EMPTY); |
325 | |
326 | REG_IPC_FIFO_CR = IPC_FIFO_ENABLE | IPC_FIFO_SEND_CLEAR | IPC_FIFO_RECV_IRQ; |
327 | |
328 | |
329 | |
330 | SoundSystemInit(spec->freq,spec->size,0,format); |
331 | SoundStartMixer(); |
332 | |
333 | |
334 | return(1); |
335 | } |