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annotate src/audio/mme/SDL_mmeaudio.c @ 3827:1806fd1acba4 SDL-ryan-multiple-audio-device

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Moved mme audio driver to 1.3 API.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 07 Oct 2006 07:54:13 +0000
parents c8b3d3d13ed1
children 29e83f221c62
rev   line source
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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
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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 #include "SDL_config.h"
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23
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24 /* Tru64 UNIX MME support */
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25 #include <mme_api.h>
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_audio.h"
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29 #include "../SDL_audio_c.h"
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30 #include "SDL_mmeaudio.h"
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31
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32 static BOOL inUse[NUM_BUFFERS];
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33
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34 static int
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35 MME_Available(void)
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36 {
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37 return 1;
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38 }
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39
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40 static void
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41 SetMMerror(char *function, MMRESULT code)
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42 {
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43 int len;
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44 char errbuf[MAXERRORLENGTH];
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45
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46 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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47 len = SDL_strlen(errbuf);
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48 waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len);
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49 SDL_SetError("%s", errbuf);
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50 }
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51
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52 static void CALLBACK
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53 MME_Callback(HWAVEOUT hwo,
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54 UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2)
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55 {
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56 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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57
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58 if (uMsg == WOM_DONE)
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59 inUse[wp->dwUser] = FALSE;
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60 }
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61
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62 static int
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63 MME_OpenDevice(_THIS, const char *devname, int iscapture)
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64 {
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65 int valid_format = 0;
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66 MMRESULT result;
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67 Uint8 *mixbuf = NULL;
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68 int i;
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69
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70 /* Initialize all variables that we clean on shutdown */
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71 this->hidden = (struct SDL_PrivateAudioData *)
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72 SDL_malloc((sizeof *this->hidden));
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73 if (this->hidden == NULL) {
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74 SDL_OutOfMemory();
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75 return 0;
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76 }
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77 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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78
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79 /* Set basic WAVE format parameters */
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80 this->hidden->shm = mmeAllocMem(sizeof(*this->hidden->shm));
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81 if (this->hidden->shm == NULL) {
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82 MME_CloseDevice(this);
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83 SDL_OutOfMemory();
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84 return 0;
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85 }
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86
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87 memset(this->hidden->shm, '\0', sizeof (*this->hidden->shm));
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88 this->hidden->shm->sound = 0;
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89 this->hidden->shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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90
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91 /* Determine the audio parameters from the AudioSpec */
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92 /* Try for a closest match on audio format */
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93 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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94 !valid_format && test_format;) {
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95 valid_format = 1;
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96 switch (test_format) {
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97 case AUDIO_U8:
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98 case AUDIO_S16:
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99 case AUDIO_S32:
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100 break;
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101 default:
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102 valid_format = 0;
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103 test_format = SDL_NextAudioFormat();
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104 }
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105 }
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106
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107 if (!valid_format) {
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108 MME_CloseDevice(this);
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109 SDL_SetError("Unsupported audio format");
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110 return 0;
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111 }
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112
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113 this->spec.format = test_format;
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114 this->hidden->shm->wFmt.wBitsPerSample = SDL_AUDIO_BITSIZE(test_format);
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115
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116 /* !!! FIXME: Can this handle more than stereo? */
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117 this->hidden->shm->wFmt.wf.nChannels = this->spec.channels;
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118 this->hidden->shm->wFmt.wf.nSamplesPerSec = this->spec.freq;
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119 this->hidden->shm->wFmt.wf.nBlockAlign =
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120 this->hidden->shm->wFmt.wf.nChannels *
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121 this->hidden->shm->wFmt.wBitsPerSample / 8;
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122 this->hidden->shm->wFmt.wf.nAvgBytesPerSec =
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123 this->hidden->shm->wFmt.wf.nSamplesPerSec *
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124 this->hidden->shm->wFmt.wf.nBlockAlign;
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125
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126 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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127 if (this->spec.samples < (this->spec.freq / 4))
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128 this->spec.samples = ((this->spec.freq / 4) + 3) & ~3;
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129
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130 /* Update the fragment size as size in bytes */
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131 SDL_CalculateAudioSpec(&this->spec);
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132
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133 /* Open the audio device */
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134 result = waveOutOpen(&(this->hidden->shm->sound),
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135 WAVE_MAPPER,
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136 &(this->hidden->shm->wFmt.wf),
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137 MME_Callback,
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138 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
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139 if (result != MMSYSERR_NOERROR) {
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140 MME_CloseDevice(this);
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141 SetMMerror("waveOutOpen()", result);
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142 return 0;
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143 }
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144
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145 /* Create the sound buffers */
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146 mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (this->spec.size));
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147 if (mixbuf == NULL) {
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148 MME_CloseDevice(this);
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149 SDL_OutOfMemory();
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150 return 0;
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151 }
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152 this->hidden->mixbuf = mixbuf;
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153
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154 for (i = 0; i < NUM_BUFFERS; i++) {
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155 this->hidden->shm->wHdr[i].lpData = &mixbuf[i * (this->spec.size)];
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156 this->hidden->shm->wHdr[i].dwBufferLength = this->spec.size;
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157 this->hidden->shm->wHdr[i].dwFlags = 0;
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158 this->hidden->shm->wHdr[i].dwUser = i;
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159 this->hidden->shm->wHdr[i].dwLoops = 0; /* loop control counter */
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160 this->hidden->shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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161 this->hidden->shm->wHdr[i].reserved = 0;
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162 inUse[i] = FALSE;
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163 }
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164 this->hidden->next_buffer = 0;
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165
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166 return 1;
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167 }
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168
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169 static void
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170 MME_WaitDevice(_THIS)
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171 {
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172 while (inUse[this->hidden->next_buffer]) {
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173 mmeWaitForCallbacks();
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174 mmeProcessCallbacks();
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175 }
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176 }
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177
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178 static Uint8 *
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179 MME_GetDeviceBuf(_THIS)
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180 {
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181 void *retval = this->hidden->shm->wHdr[this->hidden->next_buffer].lpData;
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182 inUse[this->hidden->next_buffer] = TRUE;
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183 return (Uint8 *) retval;
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184 }
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185
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186 static void
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187 MME_PlayDevice(_THIS)
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188 {
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189 /* Queue it up */
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190 waveOutWrite(this->hidden->shm->sound,
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191 &(this->hidden->shm->wHdr[this->hidden->next_buffer]),
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192 sizeof (WAVEHDR));
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193 this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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194 }
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195
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196 static void
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197 MME_WaitDone(_THIS)
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198 {
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199 MMRESULT result;
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200 int i;
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201
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202 if (this->hidden->shm->sound) {
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203 for (i = 0; i < NUM_BUFFERS; i++)
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204 while (inUse[i]) {
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205 mmeWaitForCallbacks();
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206 mmeProcessCallbacks();
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207 }
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208 result = waveOutReset(this->hidden->shm->sound);
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209 if (result != MMSYSERR_NOERROR)
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210 SetMMerror("waveOutReset()", result);
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211 mmeProcessCallbacks();
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212 }
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213 }
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214
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215 static void
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216 MME_CloseDevice(_THIS)
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217 {
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218 if (this->hidden != NULL) {
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219 MMRESULT result;
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220
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221 if (this->hidden->mixbuf) {
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222 result = mmeFreeBuffer(this->hidden->mixbuf);
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223 if (result != MMSYSERR_NOERROR)
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224 SetMMerror("mmeFreeBuffer", result);
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225 this->hidden->mixbuf = NULL;
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226 }
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227
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228 if (this->hidden->shm) {
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229 if (this->hidden->shm->sound) {
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230 result = waveOutClose(this->hidden->shm->sound);
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231 if (result != MMSYSERR_NOERROR)
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232 SetMMerror("waveOutClose()", result);
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233 mmeProcessCallbacks();
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234 }
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235 result = mmeFreeMem(this->hidden->shm);
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236 if (result != MMSYSERR_NOERROR)
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237 SetMMerror("mmeFreeMem()", result);
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238 this->hidden->shm = NULL;
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239 }
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240
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241 SDL_free(this->hidden);
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242 this->hidden = NULL;
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243 }
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244 }
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245
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246 static int
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247 MME_Init(SDL_AudioDriverImpl *impl)
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248 {
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249 /* Set the function pointers */
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250 impl->OpenDevice = MME_OpenDevice;
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251 impl->WaitDevice = MME_WaitDevice;
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252 impl->WaitDone = MME_WaitDone;
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253 impl->PlayDevice = MME_PlayDevice;
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254 impl->GetDeviceBuf = MME_GetDeviceBuf;
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255 impl->CloseDevice = MME_CloseDevice;
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256 impl->OnlyHasDefaultOutputDevice = 1;
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257
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258 return 1;
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Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
259 }
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
260
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
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261 /* !!! FIXME: Windows "windib" driver is called waveout, too */
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
262 AudioBootStrap MMEAUDIO_bootstrap = {
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
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263 "waveout", "Tru64 MME WaveOut",
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
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264 MME_Available, MME_Init, 0
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
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265 };
1806fd1acba4 Moved mme audio driver to 1.3 API.
Ryan C. Gordon <icculus@icculus.org>
parents: 3798
diff changeset
266
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
267 /* vi: set ts=4 sw=4 expandtab: */