Mercurial > sdl-ios-xcode
annotate src/audio/mme/SDL_mmeaudio.c @ 844:cd0c77df70a4
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author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 18 Feb 2004 03:57:13 +0000 |
parents | b8d311d90021 |
children | 3692456e7b0f |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2004 Sam Lantinga |
654
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4 |
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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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 |
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23 /* Tru64 UNIX MME support */ |
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24 #include "SDL_mmeaudio.h" |
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25 |
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26 static BOOL inUse[NUM_BUFFERS]; |
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27 |
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28 /* Audio driver functions */ |
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29 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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30 static void MME_WaitAudio(_THIS); |
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31 static Uint8 *MME_GetAudioBuf(_THIS); |
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32 static void MME_PlayAudio(_THIS); |
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33 static void MME_WaitDone(_THIS); |
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34 static void MME_CloseAudio(_THIS); |
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35 |
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36 /* Audio driver bootstrap functions */ |
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37 static int Audio_Available(void) |
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38 { |
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39 return(1); |
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40 } |
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41 |
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42 static void Audio_DeleteDevice(SDL_AudioDevice *device) |
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43 { |
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44 if ( device ) { |
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45 if ( device->hidden ) { |
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46 free(device->hidden); |
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47 device->hidden = NULL; |
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48 } |
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49 free(device); |
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50 device = NULL; |
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51 } |
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52 } |
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53 |
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54 static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
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55 { |
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56 SDL_AudioDevice *this; |
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57 |
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58 /* Initialize all variables that we clean on shutdown */ |
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59 this = malloc(sizeof(SDL_AudioDevice)); |
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60 if ( this ) { |
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61 memset(this, 0, (sizeof *this)); |
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62 this->hidden = malloc((sizeof *this->hidden)); |
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63 } |
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64 if ( (this == NULL) || (this->hidden == NULL) ) { |
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65 SDL_OutOfMemory(); |
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66 if ( this ) { |
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67 free(this); |
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68 } |
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69 return(0); |
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70 } |
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71 memset(this->hidden, 0, (sizeof *this->hidden)); |
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72 /* Set the function pointers */ |
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73 this->OpenAudio = MME_OpenAudio; |
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74 this->WaitAudio = MME_WaitAudio; |
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75 this->PlayAudio = MME_PlayAudio; |
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76 this->GetAudioBuf = MME_GetAudioBuf; |
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77 this->WaitDone = MME_WaitDone; |
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78 this->CloseAudio = MME_CloseAudio; |
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79 this->free = Audio_DeleteDevice; |
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80 |
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81 return this; |
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82 } |
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83 |
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84 AudioBootStrap MMEAUDIO_bootstrap = { |
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85 "waveout", "Tru64 MME WaveOut", |
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86 Audio_Available, Audio_CreateDevice |
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87 }; |
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88 |
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89 static void SetMMerror(char *function, MMRESULT code) |
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90 { |
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91 int len; |
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92 char errbuf[MAXERRORLENGTH]; |
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93 |
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94 sprintf(errbuf, "%s: ", function); |
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95 len = strlen(errbuf); |
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96 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len); |
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97 SDL_SetError("%s",errbuf); |
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98 } |
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99 |
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100 static void CALLBACK MME_CALLBACK(HWAVEOUT hwo, |
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101 UINT uMsg, |
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102 DWORD dwInstance, |
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103 LPARAM dwParam1, |
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104 LPARAM dwParam2) |
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105 { |
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106 WAVEHDR *wp = (WAVEHDR *) dwParam1; |
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107 |
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108 if ( uMsg == WOM_DONE ) |
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109 inUse[wp->dwUser] = FALSE; |
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110 } |
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111 |
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112 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec) |
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113 { |
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114 MMRESULT result; |
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115 int i; |
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116 |
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117 mixbuf = NULL; |
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118 |
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119 /* Set basic WAVE format parameters */ |
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120 shm = mmeAllocMem(sizeof(*shm)); |
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121 if ( shm == NULL ) { |
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122 SDL_SetError("Out of memory: shm"); |
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123 return(-1); |
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124 } |
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125 shm->sound = 0; |
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126 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM; |
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127 |
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128 /* Determine the audio parameters from the AudioSpec */ |
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129 switch ( spec->format & 0xFF ) { |
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130 case 8: |
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131 /* Unsigned 8 bit audio data */ |
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132 spec->format = AUDIO_U8; |
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133 shm->wFmt.wBitsPerSample = 8; |
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134 break; |
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135 case 16: |
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136 /* Signed 16 bit audio data */ |
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137 spec->format = AUDIO_S16; |
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138 shm->wFmt.wBitsPerSample = 16; |
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139 break; |
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140 default: |
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141 SDL_SetError("Unsupported audio format"); |
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142 return(-1); |
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143 } |
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144 |
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145 shm->wFmt.wf.nChannels = spec->channels; |
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146 shm->wFmt.wf.nSamplesPerSec = spec->freq; |
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147 shm->wFmt.wf.nBlockAlign = |
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148 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8; |
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149 shm->wFmt.wf.nAvgBytesPerSec = |
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150 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign; |
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151 |
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152 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
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153 if ( spec->samples < (spec->freq/4) ) |
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154 spec->samples = ((spec->freq/4)+3)&~3; |
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155 |
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156 /* Update the fragment size as size in bytes */ |
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157 SDL_CalculateAudioSpec(spec); |
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158 |
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159 /* Open the audio device */ |
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160 result = waveOutOpen(&(shm->sound), |
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161 WAVE_MAPPER, |
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162 &(shm->wFmt.wf), |
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163 MME_CALLBACK, |
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164 NULL, |
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165 (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE)); |
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166 if ( result != MMSYSERR_NOERROR ) { |
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167 SetMMerror("waveOutOpen()", result); |
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168 return(-1); |
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169 } |
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170 |
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171 /* Create the sound buffers */ |
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172 mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size)); |
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173 if ( mixbuf == NULL ) { |
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174 SDL_SetError("Out of memory: mixbuf"); |
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175 return(-1); |
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176 } |
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177 |
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178 for (i = 0; i < NUM_BUFFERS; i++) { |
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179 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)]; |
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180 shm->wHdr[i].dwBufferLength = spec->size; |
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181 shm->wHdr[i].dwFlags = 0; |
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182 shm->wHdr[i].dwUser = i; |
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183 shm->wHdr[i].dwLoops = 0; /* loop control counter */ |
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184 shm->wHdr[i].lpNext = NULL; /* reserved for driver */ |
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185 shm->wHdr[i].reserved = 0; |
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186 inUse[i] = FALSE; |
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187 } |
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188 next_buffer = 0; |
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189 return 0; |
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190 } |
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191 |
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192 static void MME_WaitAudio(_THIS) |
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193 { |
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194 while ( inUse[next_buffer] ) { |
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195 mmeWaitForCallbacks(); |
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196 mmeProcessCallbacks(); |
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197 } |
654
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198 } |
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199 |
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200 static Uint8 *MME_GetAudioBuf(_THIS) |
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201 { |
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202 Uint8 *retval; |
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203 |
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204 inUse[next_buffer] = TRUE; |
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205 retval = (Uint8 *)(shm->wHdr[next_buffer].lpData); |
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206 return retval; |
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207 } |
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208 |
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209 static void MME_PlayAudio(_THIS) |
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210 { |
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211 /* Queue it up */ |
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212 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR)); |
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213 next_buffer = (next_buffer+1)%NUM_BUFFERS; |
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214 } |
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215 |
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216 static void MME_WaitDone(_THIS) |
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217 { |
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218 MMRESULT result; |
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219 int i; |
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220 |
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221 if ( shm->sound ) { |
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222 for (i = 0; i < NUM_BUFFERS; i++) |
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223 while ( inUse[i] ) { |
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224 mmeWaitForCallbacks(); |
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225 mmeProcessCallbacks(); |
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226 } |
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227 result = waveOutReset(shm->sound); |
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228 if ( result != MMSYSERR_NOERROR ) |
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229 SetMMerror("waveOutReset()", result); |
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230 mmeProcessCallbacks(); |
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231 } |
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232 } |
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233 |
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234 static void MME_CloseAudio(_THIS) |
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235 { |
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236 MMRESULT result; |
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237 |
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238 if ( mixbuf ) { |
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239 result = mmeFreeBuffer(mixbuf); |
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240 if (result != MMSYSERR_NOERROR ) |
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241 SetMMerror("mmeFreeBuffer", result); |
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242 mixbuf = NULL; |
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243 } |
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244 |
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245 if ( shm ) { |
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246 if ( shm->sound ) { |
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247 result = waveOutClose(shm->sound); |
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248 if (result != MMSYSERR_NOERROR ) |
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249 SetMMerror("waveOutClose()", result); |
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250 mmeProcessCallbacks(); |
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251 } |
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252 result = mmeFreeMem(shm); |
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253 if (result != MMSYSERR_NOERROR ) |
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254 SetMMerror("mmeFreeMem()", result); |
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255 shm = NULL; |
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256 } |
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257 } |
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258 |