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comparison src/audio/mint/SDL_mintaudio.c @ 1111:12c49532be00

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Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
author Patrice Mandin <patmandin@gmail.com>
date Wed, 10 Aug 2005 13:29:49 +0000
parents 856f76a099c7
children 080ed9ef0609
comparison
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1110:b6fdf299a2f3 1111:12c49532be00
25 25
26 Patrice Mandin 26 Patrice Mandin
27 */ 27 */
28 28
29 #include <string.h> 29 #include <string.h>
30 #include <unistd.h>
31
32 #include <mint/osbind.h>
33 #include <mint/falcon.h>
34 #include <mint/mintbind.h>
30 35
31 #include "SDL_types.h" 36 #include "SDL_types.h"
32 #include "SDL_audio.h" 37 #include "SDL_audio.h"
33 38
34 #include "SDL_mintaudio.h" 39 #include "SDL_mintaudio.h"
41 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ 46 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
42 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ 47 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
43 unsigned short SDL_MintAudio_mutex; 48 unsigned short SDL_MintAudio_mutex;
44 unsigned long SDL_MintAudio_clocktics; 49 unsigned long SDL_MintAudio_clocktics;
45 cookie_stfa_t *SDL_MintAudio_stfa; 50 cookie_stfa_t *SDL_MintAudio_stfa;
51
52 /* MiNT thread variables */
53 SDL_bool SDL_MintAudio_mint_present;
54 SDL_bool SDL_MintAudio_quit_thread;
55 SDL_bool SDL_MintAudio_thread_finished;
56 long SDL_MintAudio_thread_pid;
46 57
47 /* The callback function, called by each driver whenever needed */ 58 /* The callback function, called by each driver whenever needed */
48 59
49 void SDL_MintAudio_Callback(void) 60 void SDL_MintAudio_Callback(void)
50 { 61 {
127 } 138 }
128 139
129 /* Not in the array, give the latest */ 140 /* Not in the array, give the latest */
130 return MINTAUDIO_freqcount-1; 141 return MINTAUDIO_freqcount-1;
131 } 142 }
143
144 /* The thread function, used under MiNT with xbios */
145 int SDL_MintAudio_Thread(long param)
146 {
147 SndBufPtr pointers;
148 SDL_bool buffers_filled[2] = {SDL_FALSE, SDL_FALSE};
149
150 SDL_MintAudio_thread_finished = SDL_FALSE;
151 while (!SDL_MintAudio_quit_thread) {
152 if (Buffptr(&pointers)!=0)
153 continue;
154
155 if (( (unsigned long)pointers.play>=(unsigned long)SDL_MintAudio_audiobuf[0])
156 && ( (unsigned long)pointers.play<=(unsigned long)SDL_MintAudio_audiobuf[1]))
157 {
158 /* DMA is reading buffer #0, setup buffer #1 if not already done */
159 if (!buffers_filled[1]) {
160 SDL_MintAudio_numbuf = 1;
161 SDL_MintAudio_Callback();
162 Setbuffer(0, SDL_MintAudio_audiobuf[1], SDL_MintAudio_audiobuf[1] + SDL_MintAudio_audiosize);
163 buffers_filled[1]=SDL_TRUE;
164 buffers_filled[0]=SDL_FALSE;
165 }
166 } else {
167 /* DMA is reading buffer #1, setup buffer #0 if not already done */
168 if (!buffers_filled[0]) {
169 SDL_MintAudio_numbuf = 0;
170 SDL_MintAudio_Callback();
171 Setbuffer(0, SDL_MintAudio_audiobuf[0], SDL_MintAudio_audiobuf[0] + SDL_MintAudio_audiosize);
172 buffers_filled[0]=SDL_TRUE;
173 buffers_filled[1]=SDL_FALSE;
174 }
175 }
176
177 usleep(1000);
178 }
179 SDL_MintAudio_thread_finished = SDL_TRUE;
180 return 0;
181 }
182
183 void SDL_MintAudio_WaitThread(void)
184 {
185 if (!SDL_MintAudio_mint_present)
186 return;
187
188 if (SDL_MintAudio_thread_finished)
189 return;
190
191 SDL_MintAudio_quit_thread = SDL_TRUE;
192 while (!SDL_MintAudio_thread_finished) {
193 Syield();
194 }
195 }