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 | |
26 | #define WIN32_LEAN_AND_MEAN |
27 | #include <windows.h> |
28 | #include <mmsystem.h> |
29 | |
30 | #include "SDL_timer.h" |
31 | #include "SDL_audio.h" |
32 | #include "../SDL_audio_c.h" |
33 | #include "SDL_dibaudio.h" |
34 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
35 | #include "win_ce_semaphore.h" |
36 | #endif |
37 | |
38 | |
39 | /* Audio driver functions */ |
40 | static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec); |
41 | static void DIB_ThreadInit(_THIS); |
42 | static void DIB_WaitAudio(_THIS); |
43 | static Uint8 *DIB_GetAudioBuf(_THIS); |
44 | static void DIB_PlayAudio(_THIS); |
45 | static void DIB_WaitDone(_THIS); |
46 | static void DIB_CloseAudio(_THIS); |
47 | |
48 | /* Audio driver bootstrap functions */ |
49 | |
50 | static int Audio_Available(void) |
51 | { |
52 | return(1); |
53 | } |
54 | |
55 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
56 | { |
57 | SDL_free(device->hidden); |
58 | SDL_free(device); |
59 | } |
60 | |
61 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
62 | { |
63 | SDL_AudioDevice *this; |
64 | |
65 | /* Initialize all variables that we clean on shutdown */ |
66 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
67 | if ( this ) { |
68 | SDL_memset(this, 0, (sizeof *this)); |
69 | this->hidden = (struct SDL_PrivateAudioData *) |
70 | SDL_malloc((sizeof *this->hidden)); |
71 | } |
72 | if ( (this == NULL) || (this->hidden == NULL) ) { |
73 | SDL_OutOfMemory(); |
74 | if ( this ) { |
75 | SDL_free(this); |
76 | } |
77 | return(0); |
78 | } |
79 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
80 | |
81 | /* Set the function pointers */ |
82 | this->OpenAudio = DIB_OpenAudio; |
83 | this->ThreadInit = DIB_ThreadInit; |
84 | this->WaitAudio = DIB_WaitAudio; |
85 | this->PlayAudio = DIB_PlayAudio; |
86 | this->GetAudioBuf = DIB_GetAudioBuf; |
87 | this->WaitDone = DIB_WaitDone; |
88 | this->CloseAudio = DIB_CloseAudio; |
89 | |
90 | this->free = Audio_DeleteDevice; |
91 | |
92 | return this; |
93 | } |
94 | |
95 | AudioBootStrap WAVEOUT_bootstrap = { |
96 | "waveout", "Win95/98/NT/2000 WaveOut", |
97 | Audio_Available, Audio_CreateDevice |
98 | }; |
99 | |
100 | |
101 | /* The Win32 callback for filling the WAVE device */ |
102 | static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance, |
103 | DWORD dwParam1, DWORD dwParam2) |
104 | { |
105 | SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance; |
106 | |
107 | /* Only service "buffer done playing" messages */ |
108 | if ( uMsg != WOM_DONE ) |
109 | return; |
110 | |
111 | /* Signal that we are done playing a buffer */ |
112 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
113 | ReleaseSemaphoreCE(audio_sem, 1, NULL); |
114 | #else |
115 | ReleaseSemaphore(audio_sem, 1, NULL); |
116 | #endif |
117 | } |
118 | |
119 | static void SetMMerror(char *function, MMRESULT code) |
120 | { |
121 | size_t len; |
122 | char errbuf[MAXERRORLENGTH]; |
123 | #ifdef _WIN32_WCE |
124 | wchar_t werrbuf[MAXERRORLENGTH]; |
125 | #endif |
126 | |
127 | SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
128 | len = SDL_strlen(errbuf); |
129 | |
130 | #ifdef _WIN32_WCE |
131 | /* UNICODE version */ |
132 | waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len); |
133 | WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL); |
134 | #else |
135 | waveOutGetErrorText(code, errbuf+len, (UINT)(MAXERRORLENGTH-len)); |
136 | #endif |
137 | |
138 | SDL_SetError("%s",errbuf); |
139 | } |
140 | |
141 | /* Set high priority for the audio thread */ |
142 | static void DIB_ThreadInit(_THIS) |
143 | { |
144 | SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); |
145 | } |
146 | |
147 | void DIB_WaitAudio(_THIS) |
148 | { |
149 | /* Wait for an audio chunk to finish */ |
150 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
151 | WaitForSemaphoreCE(audio_sem, INFINITE); |
152 | #else |
153 | WaitForSingleObject(audio_sem, INFINITE); |
154 | #endif |
155 | } |
156 | |
157 | Uint8 *DIB_GetAudioBuf(_THIS) |
158 | { |
159 | Uint8 *retval; |
160 | |
161 | retval = (Uint8 *)(wavebuf[next_buffer].lpData); |
162 | return retval; |
163 | } |
164 | |
165 | void DIB_PlayAudio(_THIS) |
166 | { |
167 | /* Queue it up */ |
168 | waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0])); |
169 | next_buffer = (next_buffer+1)%NUM_BUFFERS; |
170 | } |
171 | |
172 | void DIB_WaitDone(_THIS) |
173 | { |
174 | int i, left; |
175 | |
176 | do { |
177 | left = NUM_BUFFERS; |
178 | for ( i=0; i<NUM_BUFFERS; ++i ) { |
179 | if ( wavebuf[i].dwFlags & WHDR_DONE ) { |
180 | --left; |
181 | } |
182 | } |
183 | if ( left > 0 ) { |
184 | SDL_Delay(100); |
185 | } |
186 | } while ( left > 0 ); |
187 | } |
188 | |
189 | void DIB_CloseAudio(_THIS) |
190 | { |
191 | int i; |
192 | |
193 | /* Close up audio */ |
194 | if ( audio_sem ) { |
195 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
196 | CloseSynchHandle(audio_sem); |
197 | #else |
198 | CloseHandle(audio_sem); |
199 | #endif |
200 | } |
201 | if ( sound ) { |
202 | waveOutClose(sound); |
203 | } |
204 | |
205 | /* Clean up mixing buffers */ |
206 | for ( i=0; i<NUM_BUFFERS; ++i ) { |
207 | if ( wavebuf[i].dwUser != 0xFFFF ) { |
208 | waveOutUnprepareHeader(sound, &wavebuf[i], |
209 | sizeof(wavebuf[i])); |
210 | wavebuf[i].dwUser = 0xFFFF; |
211 | } |
212 | } |
213 | /* Free raw mixing buffer */ |
214 | if ( mixbuf != NULL ) { |
215 | SDL_free(mixbuf); |
216 | mixbuf = NULL; |
217 | } |
218 | } |
219 | |
220 | int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec) |
221 | { |
222 | MMRESULT result; |
223 | int i; |
224 | WAVEFORMATEX waveformat; |
225 | |
226 | /* Initialize the wavebuf structures for closing */ |
227 | sound = NULL; |
228 | audio_sem = NULL; |
229 | for ( i = 0; i < NUM_BUFFERS; ++i ) |
230 | wavebuf[i].dwUser = 0xFFFF; |
231 | mixbuf = NULL; |
232 | |
233 | /* Set basic WAVE format parameters */ |
234 | SDL_memset(&waveformat, 0, sizeof(waveformat)); |
235 | waveformat.wFormatTag = WAVE_FORMAT_PCM; |
236 | |
237 | /* Determine the audio parameters from the AudioSpec */ |
238 | switch ( spec->format & 0xFF ) { |
239 | case 8: |
240 | /* Unsigned 8 bit audio data */ |
241 | spec->format = AUDIO_U8; |
242 | waveformat.wBitsPerSample = 8; |
243 | break; |
244 | case 16: |
245 | /* Signed 16 bit audio data */ |
246 | spec->format = AUDIO_S16; |
247 | waveformat.wBitsPerSample = 16; |
248 | break; |
249 | default: |
250 | SDL_SetError("Unsupported audio format"); |
251 | return(-1); |
252 | } |
253 | waveformat.nChannels = spec->channels; |
254 | waveformat.nSamplesPerSec = spec->freq; |
255 | waveformat.nBlockAlign = |
256 | waveformat.nChannels * (waveformat.wBitsPerSample/8); |
257 | waveformat.nAvgBytesPerSec = |
258 | waveformat.nSamplesPerSec * waveformat.nBlockAlign; |
259 | |
260 | /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
261 | if ( spec->samples < (spec->freq/4) ) |
262 | spec->samples = ((spec->freq/4)+3)&~3; |
263 | |
264 | /* Update the fragment size as size in bytes */ |
265 | SDL_CalculateAudioSpec(spec); |
266 | |
267 | /* Open the audio device */ |
268 | result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat, |
269 | (DWORD_PTR)FillSound, (DWORD_PTR)this, CALLBACK_FUNCTION); |
270 | if ( result != MMSYSERR_NOERROR ) { |
271 | SetMMerror("waveOutOpen()", result); |
272 | return(-1); |
273 | } |
274 | |
275 | #ifdef SOUND_DEBUG |
276 | /* Check the sound device we retrieved */ |
277 | { |
278 | WAVEOUTCAPS caps; |
279 | |
280 | result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps)); |
281 | if ( result != MMSYSERR_NOERROR ) { |
282 | SetMMerror("waveOutGetDevCaps()", result); |
283 | return(-1); |
284 | } |
285 | printf("Audio device: %s\n", caps.szPname); |
286 | } |
287 | #endif |
288 | |
289 | /* Create the audio buffer semaphore */ |
290 | #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
291 | audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
292 | #else |
293 | audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
294 | #endif |
295 | if ( audio_sem == NULL ) { |
296 | SDL_SetError("Couldn't create semaphore"); |
297 | return(-1); |
298 | } |
299 | |
300 | /* Create the sound buffers */ |
301 | mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size); |
302 | if ( mixbuf == NULL ) { |
303 | SDL_SetError("Out of memory"); |
304 | return(-1); |
305 | } |
306 | for ( i = 0; i < NUM_BUFFERS; ++i ) { |
307 | SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i])); |
308 | wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size]; |
309 | wavebuf[i].dwBufferLength = spec->size; |
310 | wavebuf[i].dwFlags = WHDR_DONE; |
311 | result = waveOutPrepareHeader(sound, &wavebuf[i], |
312 | sizeof(wavebuf[i])); |
313 | if ( result != MMSYSERR_NOERROR ) { |
314 | SetMMerror("waveOutPrepareHeader()", result); |
315 | return(-1); |
316 | } |
317 | } |
318 | |
319 | /* Ready to go! */ |
320 | next_buffer = 0; |
321 | return(0); |
322 | } |