diff options
Diffstat (limited to 'apps/plugins/sdl/src/audio/dc/SDL_dcaudio.c')
-rw-r--r-- | apps/plugins/sdl/src/audio/dc/SDL_dcaudio.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/audio/dc/SDL_dcaudio.c b/apps/plugins/sdl/src/audio/dc/SDL_dcaudio.c new file mode 100644 index 0000000000..88daa8723a --- /dev/null +++ b/apps/plugins/sdl/src/audio/dc/SDL_dcaudio.c | |||
@@ -0,0 +1,246 @@ | |||
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 | */ | ||
23 | #include "SDL_config.h" | ||
24 | |||
25 | /* Output dreamcast aica */ | ||
26 | |||
27 | #include "SDL_timer.h" | ||
28 | #include "SDL_audio.h" | ||
29 | #include "../SDL_audiomem.h" | ||
30 | #include "../SDL_audio_c.h" | ||
31 | #include "../SDL_audiodev_c.h" | ||
32 | #include "SDL_dcaudio.h" | ||
33 | |||
34 | #include "aica.h" | ||
35 | #include <dc/spu.h> | ||
36 | |||
37 | /* Audio driver functions */ | ||
38 | static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec); | ||
39 | static void DCAUD_WaitAudio(_THIS); | ||
40 | static void DCAUD_PlayAudio(_THIS); | ||
41 | static Uint8 *DCAUD_GetAudioBuf(_THIS); | ||
42 | static void DCAUD_CloseAudio(_THIS); | ||
43 | |||
44 | /* Audio driver bootstrap functions */ | ||
45 | static int DCAUD_Available(void) | ||
46 | { | ||
47 | return 1; | ||
48 | } | ||
49 | |||
50 | static void DCAUD_DeleteDevice(SDL_AudioDevice *device) | ||
51 | { | ||
52 | SDL_free(device->hidden); | ||
53 | SDL_free(device); | ||
54 | } | ||
55 | |||
56 | static SDL_AudioDevice *DCAUD_CreateDevice(int devindex) | ||
57 | { | ||
58 | SDL_AudioDevice *this; | ||
59 | |||
60 | /* Initialize all variables that we clean on shutdown */ | ||
61 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); | ||
62 | if ( this ) { | ||
63 | SDL_memset(this, 0, (sizeof *this)); | ||
64 | this->hidden = (struct SDL_PrivateAudioData *) | ||
65 | SDL_malloc((sizeof *this->hidden)); | ||
66 | } | ||
67 | if ( (this == NULL) || (this->hidden == NULL) ) { | ||
68 | SDL_OutOfMemory(); | ||
69 | if ( this ) { | ||
70 | SDL_free(this); | ||
71 | } | ||
72 | return(0); | ||
73 | } | ||
74 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); | ||
75 | |||
76 | /* Set the function pointers */ | ||
77 | this->OpenAudio = DCAUD_OpenAudio; | ||
78 | this->WaitAudio = DCAUD_WaitAudio; | ||
79 | this->PlayAudio = DCAUD_PlayAudio; | ||
80 | this->GetAudioBuf = DCAUD_GetAudioBuf; | ||
81 | this->CloseAudio = DCAUD_CloseAudio; | ||
82 | |||
83 | this->free = DCAUD_DeleteDevice; | ||
84 | |||
85 | spu_init(); | ||
86 | |||
87 | return this; | ||
88 | } | ||
89 | |||
90 | AudioBootStrap DCAUD_bootstrap = { | ||
91 | "dcaudio", "Dreamcast AICA audio", | ||
92 | DCAUD_Available, DCAUD_CreateDevice | ||
93 | }; | ||
94 | |||
95 | /* This function waits until it is possible to write a full sound buffer */ | ||
96 | static void DCAUD_WaitAudio(_THIS) | ||
97 | { | ||
98 | if (this->hidden->playing) { | ||
99 | /* wait */ | ||
100 | while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) { | ||
101 | thd_pass(); | ||
102 | } | ||
103 | } | ||
104 | } | ||
105 | |||
106 | #define SPU_RAM_BASE 0xa0800000 | ||
107 | |||
108 | static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size) | ||
109 | { | ||
110 | uint8 *src = src0; | ||
111 | uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE); | ||
112 | uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE); | ||
113 | size = (size+7)/8; | ||
114 | while(size--) { | ||
115 | unsigned lval,rval; | ||
116 | lval = *src++; | ||
117 | rval = *src++; | ||
118 | lval|= (*src++)<<8; | ||
119 | rval|= (*src++)<<8; | ||
120 | lval|= (*src++)<<16; | ||
121 | rval|= (*src++)<<16; | ||
122 | lval|= (*src++)<<24; | ||
123 | rval|= (*src++)<<24; | ||
124 | g2_write_32(left++,lval); | ||
125 | g2_write_32(right++,rval); | ||
126 | g2_fifo_wait(); | ||
127 | } | ||
128 | } | ||
129 | |||
130 | static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size) | ||
131 | { | ||
132 | uint16 *src = src0; | ||
133 | uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE); | ||
134 | uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE); | ||
135 | size = (size+7)/8; | ||
136 | while(size--) { | ||
137 | unsigned lval,rval; | ||
138 | lval = *src++; | ||
139 | rval = *src++; | ||
140 | lval|= (*src++)<<16; | ||
141 | rval|= (*src++)<<16; | ||
142 | g2_write_32(left++,lval); | ||
143 | g2_write_32(right++,rval); | ||
144 | g2_fifo_wait(); | ||
145 | } | ||
146 | } | ||
147 | |||
148 | static void DCAUD_PlayAudio(_THIS) | ||
149 | { | ||
150 | SDL_AudioSpec *spec = &this->spec; | ||
151 | unsigned int offset; | ||
152 | |||
153 | if (this->hidden->playing) { | ||
154 | /* wait */ | ||
155 | while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) { | ||
156 | thd_pass(); | ||
157 | } | ||
158 | } | ||
159 | |||
160 | offset = this->hidden->nextbuf*spec->size; | ||
161 | this->hidden->nextbuf^=1; | ||
162 | /* Write the audio data, checking for EAGAIN on broken audio drivers */ | ||
163 | if (spec->channels==1) { | ||
164 | spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen); | ||
165 | } else { | ||
166 | offset/=2; | ||
167 | if ((this->spec.format&255)==8) { | ||
168 | spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen); | ||
169 | } else { | ||
170 | spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen); | ||
171 | } | ||
172 | } | ||
173 | |||
174 | if (!this->hidden->playing) { | ||
175 | int mode; | ||
176 | this->hidden->playing = 1; | ||
177 | mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT; | ||
178 | if (spec->channels==1) { | ||
179 | aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1); | ||
180 | } else { | ||
181 | aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1); | ||
182 | aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1); | ||
183 | } | ||
184 | } | ||
185 | } | ||
186 | |||
187 | static Uint8 *DCAUD_GetAudioBuf(_THIS) | ||
188 | { | ||
189 | return(this->hidden->mixbuf); | ||
190 | } | ||
191 | |||
192 | static void DCAUD_CloseAudio(_THIS) | ||
193 | { | ||
194 | aica_stop(0); | ||
195 | if (this->spec.channels==2) aica_stop(1); | ||
196 | if ( this->hidden->mixbuf != NULL ) { | ||
197 | SDL_FreeAudioMem(this->hidden->mixbuf); | ||
198 | this->hidden->mixbuf = NULL; | ||
199 | } | ||
200 | } | ||
201 | |||
202 | static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec) | ||
203 | { | ||
204 | Uint16 test_format = SDL_FirstAudioFormat(spec->format); | ||
205 | int valid_datatype = 0; | ||
206 | while ((!valid_datatype) && (test_format)) { | ||
207 | spec->format = test_format; | ||
208 | switch (test_format) { | ||
209 | /* only formats Dreamcast accepts... */ | ||
210 | case AUDIO_S8: | ||
211 | case AUDIO_S16LSB: | ||
212 | valid_datatype = 1; | ||
213 | break; | ||
214 | |||
215 | default: | ||
216 | test_format = SDL_NextAudioFormat(); | ||
217 | break; | ||
218 | } | ||
219 | } | ||
220 | |||
221 | if (!valid_datatype) { /* shouldn't happen, but just in case... */ | ||
222 | SDL_SetError("Unsupported audio format"); | ||
223 | return (-1); | ||
224 | } | ||
225 | |||
226 | if (spec->channels > 2) | ||
227 | spec->channels = 2; /* no more than stereo on the Dreamcast. */ | ||
228 | |||
229 | /* Update the fragment size as size in bytes */ | ||
230 | SDL_CalculateAudioSpec(spec); | ||
231 | |||
232 | /* Allocate mixing buffer */ | ||
233 | this->hidden->mixlen = spec->size; | ||
234 | this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); | ||
235 | if ( this->hidden->mixbuf == NULL ) { | ||
236 | return(-1); | ||
237 | } | ||
238 | SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); | ||
239 | this->hidden->leftpos = 0x11000; | ||
240 | this->hidden->rightpos = 0x11000+spec->size; | ||
241 | this->hidden->playing = 0; | ||
242 | this->hidden->nextbuf = 0; | ||
243 | |||
244 | /* We're ready to rock and roll. :-) */ | ||
245 | return(0); | ||
246 | } | ||