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annotate src/audio/mme/SDL_mmeaudio.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents d73be99e9420
children 19418e4422cb
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
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23 /* Tru64 UNIX MME support */
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24 #include <mme_api.h>
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_audio.h"
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28 #include "SDL_audio_c.h"
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29
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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 /* Audio driver functions */
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35 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec);
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36 static void MME_WaitAudio(_THIS);
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37 static Uint8 *MME_GetAudioBuf(_THIS);
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38 static void MME_PlayAudio(_THIS);
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39 static void MME_WaitDone(_THIS);
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40 static void MME_CloseAudio(_THIS);
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41
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42 /* Audio driver bootstrap functions */
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43 static int Audio_Available(void)
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44 {
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45 return(1);
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46 }
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47
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48 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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49 {
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50 if ( device ) {
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51 if ( device->hidden ) {
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52 SDL_free(device->hidden);
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53 device->hidden = NULL;
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54 }
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55 SDL_free(device);
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56 device = NULL;
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57 }
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58 }
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59
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60 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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61 {
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62 SDL_AudioDevice *this;
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63
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64 /* Initialize all variables that we clean on shutdown */
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65 this = SDL_malloc(sizeof(SDL_AudioDevice));
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66 if ( this ) {
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67 SDL_memset(this, 0, (sizeof *this));
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68 this->hidden = SDL_malloc((sizeof *this->hidden));
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69 }
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70 if ( (this == NULL) || (this->hidden == NULL) ) {
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71 SDL_OutOfMemory();
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72 if ( this ) {
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73 SDL_free(this);
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74 }
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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 /* Set the function pointers */
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79 this->OpenAudio = MME_OpenAudio;
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80 this->WaitAudio = MME_WaitAudio;
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81 this->PlayAudio = MME_PlayAudio;
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82 this->GetAudioBuf = MME_GetAudioBuf;
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83 this->WaitDone = MME_WaitDone;
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84 this->CloseAudio = MME_CloseAudio;
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85 this->free = Audio_DeleteDevice;
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86
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87 return this;
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88 }
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89
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90 AudioBootStrap MMEAUDIO_bootstrap = {
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91 "waveout", "Tru64 MME WaveOut",
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92 Audio_Available, Audio_CreateDevice
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93 };
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94
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95 static void SetMMerror(char *function, MMRESULT code)
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96 {
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97 int len;
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98 char errbuf[MAXERRORLENGTH];
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99
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100 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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101 len = SDL_strlen(errbuf);
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102 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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103 SDL_SetError("%s",errbuf);
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104 }
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105
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106 static void CALLBACK MME_CALLBACK(HWAVEOUT hwo,
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107 UINT uMsg,
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108 DWORD dwInstance,
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109 LPARAM dwParam1,
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110 LPARAM dwParam2)
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111 {
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112 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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113
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114 if ( uMsg == WOM_DONE )
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115 inUse[wp->dwUser] = FALSE;
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116 }
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117
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118 static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec)
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119 {
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120 MMRESULT result;
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121 int i;
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122
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123 mixbuf = NULL;
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124
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125 /* Set basic WAVE format parameters */
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126 shm = mmeAllocMem(sizeof(*shm));
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127 if ( shm == NULL ) {
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128 SDL_SetError("Out of memory: shm");
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129 return(-1);
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130 }
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diff changeset
131 shm->sound = 0;
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132 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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133
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diff changeset
134 /* Determine the audio parameters from the AudioSpec */
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135 switch ( spec->format & 0xFF ) {
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136 case 8:
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137 /* Unsigned 8 bit audio data */
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138 spec->format = AUDIO_U8;
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139 shm->wFmt.wBitsPerSample = 8;
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140 break;
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diff changeset
141 case 16:
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142 /* Signed 16 bit audio data */
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143 spec->format = AUDIO_S16;
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144 shm->wFmt.wBitsPerSample = 16;
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145 break;
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diff changeset
146 default:
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147 SDL_SetError("Unsupported audio format");
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148 return(-1);
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149 }
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150
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151 shm->wFmt.wf.nChannels = spec->channels;
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152 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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153 shm->wFmt.wf.nBlockAlign =
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154 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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155 shm->wFmt.wf.nAvgBytesPerSec =
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156 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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157
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158 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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159 if ( spec->samples < (spec->freq/4) )
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160 spec->samples = ((spec->freq/4)+3)&~3;
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161
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diff changeset
162 /* Update the fragment size as size in bytes */
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163 SDL_CalculateAudioSpec(spec);
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164
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diff changeset
165 /* Open the audio device */
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166 result = waveOutOpen(&(shm->sound),
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167 WAVE_MAPPER,
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diff changeset
168 &(shm->wFmt.wf),
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169 MME_CALLBACK,
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170 NULL,
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171 (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE));
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172 if ( result != MMSYSERR_NOERROR ) {
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173 SetMMerror("waveOutOpen()", result);
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174 return(-1);
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175 }
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176
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diff changeset
177 /* Create the sound buffers */
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178 mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size));
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179 if ( mixbuf == NULL ) {
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180 SDL_SetError("Out of memory: mixbuf");
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181 return(-1);
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182 }
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183
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184 for (i = 0; i < NUM_BUFFERS; i++) {
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185 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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186 shm->wHdr[i].dwBufferLength = spec->size;
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187 shm->wHdr[i].dwFlags = 0;
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188 shm->wHdr[i].dwUser = i;
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189 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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190 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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191 shm->wHdr[i].reserved = 0;
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192 inUse[i] = FALSE;
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193 }
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194 next_buffer = 0;
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195 return 0;
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196 }
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197
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198 static void MME_WaitAudio(_THIS)
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199 {
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200 while ( inUse[next_buffer] ) {
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201 mmeWaitForCallbacks();
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202 mmeProcessCallbacks();
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203 }
654
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204 }
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205
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206 static Uint8 *MME_GetAudioBuf(_THIS)
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207 {
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208 Uint8 *retval;
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209
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210 inUse[next_buffer] = TRUE;
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211 retval = (Uint8 *)(shm->wHdr[next_buffer].lpData);
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212 return retval;
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213 }
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214
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diff changeset
215 static void MME_PlayAudio(_THIS)
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diff changeset
216 {
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diff changeset
217 /* Queue it up */
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diff changeset
218 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
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219 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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220 }
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diff changeset
221
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diff changeset
222 static void MME_WaitDone(_THIS)
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diff changeset
223 {
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diff changeset
224 MMRESULT result;
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diff changeset
225 int i;
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226
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diff changeset
227 if ( shm->sound ) {
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228 for (i = 0; i < NUM_BUFFERS; i++)
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229 while ( inUse[i] ) {
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230 mmeWaitForCallbacks();
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231 mmeProcessCallbacks();
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diff changeset
232 }
654
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diff changeset
233 result = waveOutReset(shm->sound);
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234 if ( result != MMSYSERR_NOERROR )
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235 SetMMerror("waveOutReset()", result);
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236 mmeProcessCallbacks();
654
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237 }
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238 }
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239
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diff changeset
240 static void MME_CloseAudio(_THIS)
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241 {
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diff changeset
242 MMRESULT result;
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diff changeset
243
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
244 if ( mixbuf ) {
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diff changeset
245 result = mmeFreeBuffer(mixbuf);
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diff changeset
246 if (result != MMSYSERR_NOERROR )
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diff changeset
247 SetMMerror("mmeFreeBuffer", result);
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248 mixbuf = NULL;
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249 }
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250
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
251 if ( shm ) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
252 if ( shm->sound ) {
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diff changeset
253 result = waveOutClose(shm->sound);
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diff changeset
254 if (result != MMSYSERR_NOERROR )
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diff changeset
255 SetMMerror("waveOutClose()", result);
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256 mmeProcessCallbacks();
654
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257 }
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258 result = mmeFreeMem(shm);
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259 if (result != MMSYSERR_NOERROR )
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260 SetMMerror("mmeFreeMem()", result);
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261 shm = NULL;
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262 }
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263 }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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264