Mercurial > sdl-ios-xcode
annotate src/audio/windib/SDL_dibaudio.c @ 4541:abb56f7699ea SDL-1.2
Fixed bug 936
Make sure that eip doesn't overflow the copy buffer beforehand. :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Jul 2010 10:08:06 -0700 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Allow access to a raw mixing buffer */ | |
| 25 | |
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26 #define WIN32_LEAN_AND_MEAN |
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27 #include <windows.h> |
| 0 | 28 #include <mmsystem.h> |
| 29 | |
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30 #include "SDL_timer.h" |
| 0 | 31 #include "SDL_audio.h" |
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32 #include "../SDL_audio_c.h" |
| 0 | 33 #include "SDL_dibaudio.h" |
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34 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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35 #include "win_ce_semaphore.h" |
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36 #endif |
| 0 | 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 { | |
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57 SDL_free(device->hidden); |
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58 SDL_free(device); |
| 0 | 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 */ | |
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66 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 67 if ( this ) { |
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68 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 69 this->hidden = (struct SDL_PrivateAudioData *) |
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70 SDL_malloc((sizeof *this->hidden)); |
| 0 | 71 } |
| 72 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 73 SDL_OutOfMemory(); | |
| 74 if ( this ) { | |
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75 SDL_free(this); |
| 0 | 76 } |
| 77 return(0); | |
| 78 } | |
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79 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 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 */ | |
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102 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance, |
| 0 | 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 */ | |
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112 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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113 ReleaseSemaphoreCE(audio_sem, 1, NULL); |
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114 #else |
| 0 | 115 ReleaseSemaphore(audio_sem, 1, NULL); |
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116 #endif |
| 0 | 117 } |
| 118 | |
| 119 static void SetMMerror(char *function, MMRESULT code) | |
| 120 { | |
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121 size_t len; |
| 0 | 122 char errbuf[MAXERRORLENGTH]; |
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123 #ifdef _WIN32_WCE |
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124 wchar_t werrbuf[MAXERRORLENGTH]; |
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125 #endif |
| 0 | 126 |
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127 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
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128 len = SDL_strlen(errbuf); |
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129 |
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130 #ifdef _WIN32_WCE |
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131 /* UNICODE version */ |
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132 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len); |
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133 WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL); |
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134 #else |
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135 waveOutGetErrorText(code, errbuf+len, (UINT)(MAXERRORLENGTH-len)); |
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136 #endif |
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137 |
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138 SDL_SetError("%s",errbuf); |
| 0 | 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 */ | |
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150 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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151 WaitForSemaphoreCE(audio_sem, INFINITE); |
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152 #else |
| 0 | 153 WaitForSingleObject(audio_sem, INFINITE); |
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154 #endif |
| 0 | 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 ) { | |
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195 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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196 CloseSynchHandle(audio_sem); |
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197 #else |
| 0 | 198 CloseHandle(audio_sem); |
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199 #endif |
| 0 | 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 ) { | |
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215 SDL_free(mixbuf); |
| 0 | 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 */ | |
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234 SDL_memset(&waveformat, 0, sizeof(waveformat)); |
| 0 | 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, | |
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269 (DWORD_PTR)FillSound, (DWORD_PTR)this, CALLBACK_FUNCTION); |
| 0 | 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 */ | |
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290 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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291 audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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292 #else |
| 0 | 293 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL); |
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294 #endif |
| 0 | 295 if ( audio_sem == NULL ) { |
| 296 SDL_SetError("Couldn't create semaphore"); | |
| 297 return(-1); | |
| 298 } | |
| 299 | |
| 300 /* Create the sound buffers */ | |
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301 mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size); |
| 0 | 302 if ( mixbuf == NULL ) { |
| 303 SDL_SetError("Out of memory"); | |
| 304 return(-1); | |
| 305 } | |
| 306 for ( i = 0; i < NUM_BUFFERS; ++i ) { | |
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307 SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i])); |
| 0 | 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 } |