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comparison src/audio/mme/SDL_mmeaudio.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents d910939febfa
children b3741f227757
comparison
equal deleted inserted replaced
1894:c69cee13dd76 1895:c121d94672cb
30 #include "SDL_mmeaudio.h" 30 #include "SDL_mmeaudio.h"
31 31
32 static BOOL inUse[NUM_BUFFERS]; 32 static BOOL inUse[NUM_BUFFERS];
33 33
34 /* Audio driver functions */ 34 /* Audio driver functions */
35 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec); 35 static int MME_OpenAudio(_THIS, SDL_AudioSpec * spec);
36 static void MME_WaitAudio(_THIS); 36 static void MME_WaitAudio(_THIS);
37 static Uint8 *MME_GetAudioBuf(_THIS); 37 static Uint8 *MME_GetAudioBuf(_THIS);
38 static void MME_PlayAudio(_THIS); 38 static void MME_PlayAudio(_THIS);
39 static void MME_WaitDone(_THIS); 39 static void MME_WaitDone(_THIS);
40 static void MME_CloseAudio(_THIS); 40 static void MME_CloseAudio(_THIS);
41 41
42 /* Audio driver bootstrap functions */ 42 /* Audio driver bootstrap functions */
43 static int Audio_Available(void) 43 static int
44 { 44 Audio_Available(void)
45 return(1); 45 {
46 } 46 return (1);
47 47 }
48 static void Audio_DeleteDevice(SDL_AudioDevice *device) 48
49 { 49 static void
50 if ( device ) { 50 Audio_DeleteDevice(SDL_AudioDevice * device)
51 if ( device->hidden ) { 51 {
52 SDL_free(device->hidden); 52 if (device) {
53 device->hidden = NULL; 53 if (device->hidden) {
54 } 54 SDL_free(device->hidden);
55 SDL_free(device); 55 device->hidden = NULL;
56 device = NULL; 56 }
57 } 57 SDL_free(device);
58 } 58 device = NULL;
59 59 }
60 static SDL_AudioDevice *Audio_CreateDevice(int devindex) 60 }
61
62 static SDL_AudioDevice *
63 Audio_CreateDevice(int devindex)
61 { 64 {
62 SDL_AudioDevice *this; 65 SDL_AudioDevice *this;
63 66
64 /* Initialize all variables that we clean on shutdown */ 67 /* Initialize all variables that we clean on shutdown */
65 this = SDL_malloc(sizeof(SDL_AudioDevice)); 68 this = SDL_malloc(sizeof(SDL_AudioDevice));
66 if ( this ) { 69 if (this) {
67 SDL_memset(this, 0, (sizeof *this)); 70 SDL_memset(this, 0, (sizeof *this));
68 this->hidden = SDL_malloc((sizeof *this->hidden)); 71 this->hidden = SDL_malloc((sizeof *this->hidden));
69 } 72 }
70 if ( (this == NULL) || (this->hidden == NULL) ) { 73 if ((this == NULL) || (this->hidden == NULL)) {
71 SDL_OutOfMemory(); 74 SDL_OutOfMemory();
72 if ( this ) { 75 if (this) {
73 SDL_free(this); 76 SDL_free(this);
74 } 77 }
75 return(0); 78 return (0);
76 } 79 }
77 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 80 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
78 /* Set the function pointers */ 81 /* Set the function pointers */
79 this->OpenAudio = MME_OpenAudio; 82 this->OpenAudio = MME_OpenAudio;
80 this->WaitAudio = MME_WaitAudio; 83 this->WaitAudio = MME_WaitAudio;
81 this->PlayAudio = MME_PlayAudio; 84 this->PlayAudio = MME_PlayAudio;
82 this->GetAudioBuf = MME_GetAudioBuf; 85 this->GetAudioBuf = MME_GetAudioBuf;
83 this->WaitDone = MME_WaitDone; 86 this->WaitDone = MME_WaitDone;
84 this->CloseAudio = MME_CloseAudio; 87 this->CloseAudio = MME_CloseAudio;
85 this->free = Audio_DeleteDevice; 88 this->free = Audio_DeleteDevice;
86 89
87 return this; 90 return this;
88 } 91 }
89 92
90 AudioBootStrap MMEAUDIO_bootstrap = { 93 AudioBootStrap MMEAUDIO_bootstrap = {
91 "waveout", "Tru64 MME WaveOut", 94 "waveout", "Tru64 MME WaveOut",
92 Audio_Available, Audio_CreateDevice 95 Audio_Available, Audio_CreateDevice
93 }; 96 };
94 97
95 static void SetMMerror(char *function, MMRESULT code) 98 static void
99 SetMMerror(char *function, MMRESULT code)
96 { 100 {
97 int len; 101 int len;
98 char errbuf[MAXERRORLENGTH]; 102 char errbuf[MAXERRORLENGTH];
99 103
100 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); 104 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
101 len = SDL_strlen(errbuf); 105 len = SDL_strlen(errbuf);
102 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len); 106 waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len);
103 SDL_SetError("%s",errbuf); 107 SDL_SetError("%s", errbuf);
104 } 108 }
105 109
106 static void CALLBACK MME_CALLBACK(HWAVEOUT hwo, 110 static void CALLBACK
107 UINT uMsg, 111 MME_CALLBACK(HWAVEOUT hwo,
108 DWORD dwInstance, 112 UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2)
109 LPARAM dwParam1,
110 LPARAM dwParam2)
111 { 113 {
112 WAVEHDR *wp = (WAVEHDR *) dwParam1; 114 WAVEHDR *wp = (WAVEHDR *) dwParam1;
113 115
114 if ( uMsg == WOM_DONE ) 116 if (uMsg == WOM_DONE)
115 inUse[wp->dwUser] = FALSE; 117 inUse[wp->dwUser] = FALSE;
116 } 118 }
117 119
118 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec) 120 static int
121 MME_OpenAudio(_THIS, SDL_AudioSpec * spec)
119 { 122 {
120 MMRESULT result; 123 MMRESULT result;
121 int i; 124 int i;
122 125
123 mixbuf = NULL; 126 mixbuf = NULL;
124 127
125 /* Set basic WAVE format parameters */ 128 /* Set basic WAVE format parameters */
126 shm = mmeAllocMem(sizeof(*shm)); 129 shm = mmeAllocMem(sizeof(*shm));
127 if ( shm == NULL ) { 130 if (shm == NULL) {
128 SDL_SetError("Out of memory: shm"); 131 SDL_SetError("Out of memory: shm");
129 return(-1); 132 return (-1);
130 } 133 }
131 shm->sound = 0; 134 shm->sound = 0;
132 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM; 135 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
133 136
134 /* Determine the audio parameters from the AudioSpec */ 137 /* Determine the audio parameters from the AudioSpec */
135 switch ( spec->format & 0xFF ) { 138 switch (spec->format & 0xFF) {
136 case 8: 139 case 8:
137 /* Unsigned 8 bit audio data */ 140 /* Unsigned 8 bit audio data */
138 spec->format = AUDIO_U8; 141 spec->format = AUDIO_U8;
139 shm->wFmt.wBitsPerSample = 8; 142 shm->wFmt.wBitsPerSample = 8;
140 break; 143 break;
141 case 16: 144 case 16:
142 /* Signed 16 bit audio data */ 145 /* Signed 16 bit audio data */
143 spec->format = AUDIO_S16; 146 spec->format = AUDIO_S16;
144 shm->wFmt.wBitsPerSample = 16; 147 shm->wFmt.wBitsPerSample = 16;
145 break; 148 break;
146 default: 149 default:
147 SDL_SetError("Unsupported audio format"); 150 SDL_SetError("Unsupported audio format");
148 return(-1); 151 return (-1);
149 } 152 }
150 153
151 shm->wFmt.wf.nChannels = spec->channels; 154 shm->wFmt.wf.nChannels = spec->channels;
152 shm->wFmt.wf.nSamplesPerSec = spec->freq; 155 shm->wFmt.wf.nSamplesPerSec = spec->freq;
153 shm->wFmt.wf.nBlockAlign = 156 shm->wFmt.wf.nBlockAlign =
154 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8; 157 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
155 shm->wFmt.wf.nAvgBytesPerSec = 158 shm->wFmt.wf.nAvgBytesPerSec =
156 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign; 159 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
157 160
158 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ 161 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
159 if ( spec->samples < (spec->freq/4) ) 162 if (spec->samples < (spec->freq / 4))
160 spec->samples = ((spec->freq/4)+3)&~3; 163 spec->samples = ((spec->freq / 4) + 3) & ~3;
161 164
162 /* Update the fragment size as size in bytes */ 165 /* Update the fragment size as size in bytes */
163 SDL_CalculateAudioSpec(spec); 166 SDL_CalculateAudioSpec(spec);
164 167
165 /* Open the audio device */ 168 /* Open the audio device */
166 result = waveOutOpen(&(shm->sound), 169 result = waveOutOpen(&(shm->sound),
167 WAVE_MAPPER, 170 WAVE_MAPPER,
168 &(shm->wFmt.wf), 171 &(shm->wFmt.wf),
169 MME_CALLBACK, 172 MME_CALLBACK,
170 NULL, 173 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
171 (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE)); 174 if (result != MMSYSERR_NOERROR) {
172 if ( result != MMSYSERR_NOERROR ) { 175 SetMMerror("waveOutOpen()", result);
173 SetMMerror("waveOutOpen()", result); 176 return (-1);
174 return(-1);
175 } 177 }
176 178
177 /* Create the sound buffers */ 179 /* Create the sound buffers */
178 mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size)); 180 mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (spec->size));
179 if ( mixbuf == NULL ) { 181 if (mixbuf == NULL) {
180 SDL_SetError("Out of memory: mixbuf"); 182 SDL_SetError("Out of memory: mixbuf");
181 return(-1); 183 return (-1);
182 } 184 }
183 185
184 for (i = 0; i < NUM_BUFFERS; i++) { 186 for (i = 0; i < NUM_BUFFERS; i++) {
185 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)]; 187 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
186 shm->wHdr[i].dwBufferLength = spec->size; 188 shm->wHdr[i].dwBufferLength = spec->size;
187 shm->wHdr[i].dwFlags = 0; 189 shm->wHdr[i].dwFlags = 0;
188 shm->wHdr[i].dwUser = i; 190 shm->wHdr[i].dwUser = i;
189 shm->wHdr[i].dwLoops = 0; /* loop control counter */ 191 shm->wHdr[i].dwLoops = 0; /* loop control counter */
190 shm->wHdr[i].lpNext = NULL; /* reserved for driver */ 192 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
191 shm->wHdr[i].reserved = 0; 193 shm->wHdr[i].reserved = 0;
192 inUse[i] = FALSE; 194 inUse[i] = FALSE;
193 } 195 }
194 next_buffer = 0; 196 next_buffer = 0;
195 return 0; 197 return 0;
196 } 198 }
197 199
198 static void MME_WaitAudio(_THIS) 200 static void
199 { 201 MME_WaitAudio(_THIS)
200 while ( inUse[next_buffer] ) { 202 {
201 mmeWaitForCallbacks(); 203 while (inUse[next_buffer]) {
202 mmeProcessCallbacks(); 204 mmeWaitForCallbacks();
203 } 205 mmeProcessCallbacks();
204 } 206 }
205 207 }
206 static Uint8 *MME_GetAudioBuf(_THIS) 208
209 static Uint8 *
210 MME_GetAudioBuf(_THIS)
207 { 211 {
208 Uint8 *retval; 212 Uint8 *retval;
209 213
210 inUse[next_buffer] = TRUE; 214 inUse[next_buffer] = TRUE;
211 retval = (Uint8 *)(shm->wHdr[next_buffer].lpData); 215 retval = (Uint8 *) (shm->wHdr[next_buffer].lpData);
212 return retval; 216 return retval;
213 } 217 }
214 218
215 static void MME_PlayAudio(_THIS) 219 static void
220 MME_PlayAudio(_THIS)
216 { 221 {
217 /* Queue it up */ 222 /* Queue it up */
218 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR)); 223 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
219 next_buffer = (next_buffer+1)%NUM_BUFFERS; 224 next_buffer = (next_buffer + 1) % NUM_BUFFERS;
220 } 225 }
221 226
222 static void MME_WaitDone(_THIS) 227 static void
228 MME_WaitDone(_THIS)
223 { 229 {
224 MMRESULT result; 230 MMRESULT result;
225 int i; 231 int i;
226 232
227 if ( shm->sound ) { 233 if (shm->sound) {
228 for (i = 0; i < NUM_BUFFERS; i++) 234 for (i = 0; i < NUM_BUFFERS; i++)
229 while ( inUse[i] ) { 235 while (inUse[i]) {
230 mmeWaitForCallbacks(); 236 mmeWaitForCallbacks();
231 mmeProcessCallbacks(); 237 mmeProcessCallbacks();
232 } 238 }
233 result = waveOutReset(shm->sound); 239 result = waveOutReset(shm->sound);
234 if ( result != MMSYSERR_NOERROR ) 240 if (result != MMSYSERR_NOERROR)
235 SetMMerror("waveOutReset()", result); 241 SetMMerror("waveOutReset()", result);
236 mmeProcessCallbacks(); 242 mmeProcessCallbacks();
237 } 243 }
238 } 244 }
239 245
240 static void MME_CloseAudio(_THIS) 246 static void
247 MME_CloseAudio(_THIS)
241 { 248 {
242 MMRESULT result; 249 MMRESULT result;
243 250
244 if ( mixbuf ) { 251 if (mixbuf) {
245 result = mmeFreeBuffer(mixbuf); 252 result = mmeFreeBuffer(mixbuf);
246 if (result != MMSYSERR_NOERROR ) 253 if (result != MMSYSERR_NOERROR)
247 SetMMerror("mmeFreeBuffer", result); 254 SetMMerror("mmeFreeBuffer", result);
248 mixbuf = NULL; 255 mixbuf = NULL;
249 } 256 }
250 257
251 if ( shm ) { 258 if (shm) {
252 if ( shm->sound ) { 259 if (shm->sound) {
253 result = waveOutClose(shm->sound); 260 result = waveOutClose(shm->sound);
254 if (result != MMSYSERR_NOERROR ) 261 if (result != MMSYSERR_NOERROR)
255 SetMMerror("waveOutClose()", result); 262 SetMMerror("waveOutClose()", result);
256 mmeProcessCallbacks(); 263 mmeProcessCallbacks();
257 } 264 }
258 result = mmeFreeMem(shm); 265 result = mmeFreeMem(shm);
259 if (result != MMSYSERR_NOERROR ) 266 if (result != MMSYSERR_NOERROR)
260 SetMMerror("mmeFreeMem()", result); 267 SetMMerror("mmeFreeMem()", result);
261 shm = NULL; 268 shm = NULL;
262 } 269 }
263 } 270 }
264 271
272 /* vi: set ts=4 sw=4 expandtab: */