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annotate src/audio/mme/SDL_mmeaudio.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
children
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 /* 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
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44 Audio_Available(void)
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45 {
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46 return (1);
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47 }
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48
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49 static void
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50 Audio_DeleteDevice(SDL_AudioDevice * device)
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51 {
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52 if (device) {
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53 if (device->hidden) {
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54 SDL_free(device->hidden);
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55 device->hidden = NULL;
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56 }
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57 SDL_free(device);
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58 device = NULL;
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59 }
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60 }
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61
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62 static SDL_AudioDevice *
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63 Audio_CreateDevice(int devindex)
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64 {
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65 SDL_AudioDevice *this;
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66
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67 /* Initialize all variables that we clean on shutdown */
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68 this = SDL_malloc(sizeof(SDL_AudioDevice));
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69 if (this) {
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70 SDL_memset(this, 0, (sizeof *this));
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71 this->hidden = SDL_malloc((sizeof *this->hidden));
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72 }
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73 if ((this == NULL) || (this->hidden == NULL)) {
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74 SDL_OutOfMemory();
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75 if (this) {
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76 SDL_free(this);
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77 }
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78 return (0);
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79 }
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80 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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81 /* Set the function pointers */
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82 this->OpenAudio = MME_OpenAudio;
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83 this->WaitAudio = MME_WaitAudio;
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84 this->PlayAudio = MME_PlayAudio;
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85 this->GetAudioBuf = MME_GetAudioBuf;
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86 this->WaitDone = MME_WaitDone;
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87 this->CloseAudio = MME_CloseAudio;
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88 this->free = Audio_DeleteDevice;
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89
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90 return this;
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91 }
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92
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93 AudioBootStrap MMEAUDIO_bootstrap = {
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94 "waveout", "Tru64 MME WaveOut",
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95 Audio_Available, Audio_CreateDevice
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96 };
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97
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98 static void
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99 SetMMerror(char *function, MMRESULT code)
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100 {
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101 int len;
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102 char errbuf[MAXERRORLENGTH];
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103
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104 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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105 len = SDL_strlen(errbuf);
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106 waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len);
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107 SDL_SetError("%s", errbuf);
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108 }
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109
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110 static void CALLBACK
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111 MME_CALLBACK(HWAVEOUT hwo,
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112 UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2)
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113 {
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114 WAVEHDR *wp = (WAVEHDR *) dwParam1;
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115
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116 if (uMsg == WOM_DONE)
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117 inUse[wp->dwUser] = FALSE;
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118 }
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119
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120 static int
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121 MME_OpenAudio(_THIS, SDL_AudioSpec * spec)
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122 {
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123 MMRESULT result;
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124 int i;
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125
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126 mixbuf = NULL;
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127
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128 /* Set basic WAVE format parameters */
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129 shm = mmeAllocMem(sizeof(*shm));
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130 if (shm == NULL) {
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131 SDL_SetError("Out of memory: shm");
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132 return (-1);
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133 }
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134 shm->sound = 0;
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135 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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136
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137 /* Determine the audio parameters from the AudioSpec */
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138 switch (spec->format & 0xFF) {
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139 case 8:
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140 /* Unsigned 8 bit audio data */
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141 spec->format = AUDIO_U8;
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142 shm->wFmt.wBitsPerSample = 8;
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143 break;
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144 case 16:
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145 /* Signed 16 bit audio data */
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146 spec->format = AUDIO_S16;
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147 shm->wFmt.wBitsPerSample = 16;
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148 break;
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149 default:
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150 SDL_SetError("Unsupported audio format");
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151 return (-1);
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152 }
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153
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154 shm->wFmt.wf.nChannels = spec->channels;
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155 shm->wFmt.wf.nSamplesPerSec = spec->freq;
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156 shm->wFmt.wf.nBlockAlign =
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157 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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158 shm->wFmt.wf.nAvgBytesPerSec =
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159 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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160
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161 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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162 if (spec->samples < (spec->freq / 4))
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163 spec->samples = ((spec->freq / 4) + 3) & ~3;
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164
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165 /* Update the fragment size as size in bytes */
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166 SDL_CalculateAudioSpec(spec);
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167
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168 /* Open the audio device */
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169 result = waveOutOpen(&(shm->sound),
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170 WAVE_MAPPER,
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171 &(shm->wFmt.wf),
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172 MME_CALLBACK,
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173 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
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174 if (result != MMSYSERR_NOERROR) {
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175 SetMMerror("waveOutOpen()", result);
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176 return (-1);
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177 }
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178
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179 /* Create the sound buffers */
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180 mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (spec->size));
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181 if (mixbuf == NULL) {
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182 SDL_SetError("Out of memory: mixbuf");
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183 return (-1);
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184 }
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185
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186 for (i = 0; i < NUM_BUFFERS; i++) {
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187 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
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188 shm->wHdr[i].dwBufferLength = spec->size;
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189 shm->wHdr[i].dwFlags = 0;
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190 shm->wHdr[i].dwUser = i;
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191 shm->wHdr[i].dwLoops = 0; /* loop control counter */
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192 shm->wHdr[i].lpNext = NULL; /* reserved for driver */
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193 shm->wHdr[i].reserved = 0;
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194 inUse[i] = FALSE;
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195 }
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196 next_buffer = 0;
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197 return 0;
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198 }
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199
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200 static void
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201 MME_WaitAudio(_THIS)
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202 {
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203 while (inUse[next_buffer]) {
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204 mmeWaitForCallbacks();
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205 mmeProcessCallbacks();
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206 }
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207 }
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208
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209 static Uint8 *
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210 MME_GetAudioBuf(_THIS)
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211 {
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212 Uint8 *retval;
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213
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214 inUse[next_buffer] = TRUE;
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215 retval = (Uint8 *) (shm->wHdr[next_buffer].lpData);
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216 return retval;
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217 }
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218
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219 static void
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220 MME_PlayAudio(_THIS)
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221 {
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222 /* Queue it up */
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223 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
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224 next_buffer = (next_buffer + 1) % NUM_BUFFERS;
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225 }
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226
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227 static void
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228 MME_WaitDone(_THIS)
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229 {
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230 MMRESULT result;
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diff changeset
231 int i;
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232
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233 if (shm->sound) {
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234 for (i = 0; i < NUM_BUFFERS; i++)
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235 while (inUse[i]) {
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236 mmeWaitForCallbacks();
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237 mmeProcessCallbacks();
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238 }
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239 result = waveOutReset(shm->sound);
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240 if (result != MMSYSERR_NOERROR)
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241 SetMMerror("waveOutReset()", result);
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242 mmeProcessCallbacks();
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243 }
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244 }
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245
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246 static void
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247 MME_CloseAudio(_THIS)
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248 {
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249 MMRESULT result;
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250
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251 if (mixbuf) {
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252 result = mmeFreeBuffer(mixbuf);
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253 if (result != MMSYSERR_NOERROR)
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254 SetMMerror("mmeFreeBuffer", result);
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255 mixbuf = NULL;
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256 }
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257
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258 if (shm) {
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259 if (shm->sound) {
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260 result = waveOutClose(shm->sound);
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261 if (result != MMSYSERR_NOERROR)
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262 SetMMerror("waveOutClose()", result);
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263 mmeProcessCallbacks();
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264 }
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265 result = mmeFreeMem(shm);
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266 if (result != MMSYSERR_NOERROR)
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267 SetMMerror("mmeFreeMem()", result);
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268 shm = NULL;
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269 }
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270 }
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271
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272 /* vi: set ts=4 sw=4 expandtab: */