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annotate src/audio/dart/SDL_dart.c @ 1663:11775724e3fe SDL-1.3

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fine tuning indent output
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:29:03 +0000
parents 782fd950bd46
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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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.
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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 Lesser 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 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
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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 /* Allow access to a raw mixing buffer */
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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 #include "SDL_dart.h"
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30
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31 // Buffer states:
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32 #define BUFFER_EMPTY 0
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33 #define BUFFER_USED 1
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34
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35 typedef struct _tMixBufferDesc
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36 {
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37 int iBufferUsage; // BUFFER_EMPTY or BUFFER_USED
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38 SDL_AudioDevice *pSDLAudioDevice;
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39 } tMixBufferDesc, *pMixBufferDesc;
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40
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41
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42 //---------------------------------------------------------------------
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43 // DARTEventFunc
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44 //
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45 // This function is called by DART, when an event occures, like end of
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46 // playback of a buffer, etc...
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47 //---------------------------------------------------------------------
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48 LONG APIENTRY
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49 DARTEventFunc (ULONG ulStatus, PMCI_MIX_BUFFER pBuffer, ULONG ulFlags)
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50 {
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51 if (ulFlags && MIX_WRITE_COMPLETE) { // Playback of buffer completed!
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52
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53 // Get pointer to buffer description
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54 pMixBufferDesc pBufDesc;
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55
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56 if (pBuffer) {
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57 pBufDesc = (pMixBufferDesc) (*pBuffer).ulUserParm;
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58
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59 if (pBufDesc) {
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60 SDL_AudioDevice *pSDLAudioDevice = pBufDesc->pSDLAudioDevice;
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61 // Set the buffer to be empty
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62 pBufDesc->iBufferUsage = BUFFER_EMPTY;
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63 // And notify DART feeder thread that it will have to work a bit.
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64 if (pSDLAudioDevice)
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65 DosPostEventSem (pSDLAudioDevice->hidden->
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66 hevAudioBufferPlayed);
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67 }
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68 }
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69 }
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70 return TRUE;
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71 }
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72
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73
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74 int
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75 DART_OpenAudio (_THIS, SDL_AudioSpec * spec)
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76 {
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77 MCI_AMP_OPEN_PARMS AmpOpenParms;
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78 MCI_GENERIC_PARMS GenericParms;
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79 int iDeviceOrd = 0; // Default device to be used
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80 int bOpenShared = 1; // Try opening it shared
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81 int iBits = 16; // Default is 16 bits signed
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82 int iFreq = 44100; // Default is 44KHz
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83 int iChannels = 2; // Default is 2 channels (Stereo)
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84 int iNumBufs = 2; // Number of audio buffers: 2
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85 int iBufSize;
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86 int iOpenMode;
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87 int iSilence;
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88 int rc;
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89
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90 // First thing is to try to open a given DART device!
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91 SDL_memset (&AmpOpenParms, 0, sizeof (MCI_AMP_OPEN_PARMS));
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92 // pszDeviceType should contain the device type in low word, and device ordinal in high word!
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93 AmpOpenParms.pszDeviceType =
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94 (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16));
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95
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96 iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID;
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97 if (bOpenShared)
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98 iOpenMode |= MCI_OPEN_SHAREABLE;
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99
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100 rc = mciSendCommand (0, MCI_OPEN, iOpenMode, (PVOID) & AmpOpenParms, 0);
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101 if (rc != MCIERR_SUCCESS) // No audio available??
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102 return (-1);
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103 // Save the device ID we got from DART!
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104 // We will use this in the next calls!
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105 iDeviceOrd = AmpOpenParms.usDeviceID;
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106
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107 // Determine the audio parameters from the AudioSpec
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108 switch (spec->format & 0xFF) {
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109 case 8:
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110 /* Unsigned 8 bit audio data */
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111 spec->format = AUDIO_U8;
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112 iSilence = 0x80;
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113 iBits = 8;
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114 break;
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115 case 16:
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116 /* Signed 16 bit audio data */
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117 spec->format = AUDIO_S16;
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118 iSilence = 0x00;
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119 iBits = 16;
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120 break;
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121 default:
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122 // Close DART, and exit with error code!
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123 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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124 SDL_SetError ("Unsupported audio format");
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125 return (-1);
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126 }
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127 iFreq = spec->freq;
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128 iChannels = spec->channels;
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129 /* Update the fragment size as size in bytes */
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130 SDL_CalculateAudioSpec (spec);
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131 iBufSize = spec->size;
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132
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133 // Now query this device if it supports the given freq/bits/channels!
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134 SDL_memset (&(_this->hidden->MixSetupParms), 0,
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135 sizeof (MCI_MIXSETUP_PARMS));
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136 _this->hidden->MixSetupParms.ulBitsPerSample = iBits;
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137 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
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138 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq;
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139 _this->hidden->MixSetupParms.ulChannels = iChannels;
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140 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY;
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141 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;
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142 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc;
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143 rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP,
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144 MCI_WAIT | MCI_MIXSETUP_QUERYMODE,
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145 &(_this->hidden->MixSetupParms), 0);
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146 if (rc != MCIERR_SUCCESS) { // The device cannot handle this format!
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147 // Close DART, and exit with error code!
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148 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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149 SDL_SetError ("Audio device doesn't support requested audio format");
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150 return (-1);
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151 }
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152 // The device can handle this format, so initialize!
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153 rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP,
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154 MCI_WAIT | MCI_MIXSETUP_INIT,
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155 &(_this->hidden->MixSetupParms), 0);
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156 if (rc != MCIERR_SUCCESS) { // The device could not be opened!
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157 // Close DART, and exit with error code!
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158 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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159 SDL_SetError ("Audio device could not be set up");
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160 return (-1);
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161 }
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162 // Ok, the device is initialized.
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163 // Now we should allocate buffers. For this, we need a place where
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164 // the buffer descriptors will be:
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165 _this->hidden->pMixBuffers =
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166 (MCI_MIX_BUFFER *) SDL_malloc (sizeof (MCI_MIX_BUFFER) * iNumBufs);
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167 if (!(_this->hidden->pMixBuffers)) { // Not enough memory!
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168 // Close DART, and exit with error code!
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169 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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170 SDL_SetError ("Not enough memory for audio buffer descriptors");
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171 return (-1);
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172 }
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173 // Now that we have the place for buffer list, we can ask DART for the
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174 // buffers!
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175 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers
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176 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size
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177 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list
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178 // Allocate buffers!
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179 rc = mciSendCommand (iDeviceOrd, MCI_BUFFER,
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180 MCI_WAIT | MCI_ALLOCATE_MEMORY,
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181 &(_this->hidden->BufferParms), 0);
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182 if ((rc != MCIERR_SUCCESS)
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183 || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers)
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184 || (_this->hidden->BufferParms.ulBufferSize == 0)) { // Could not allocate memory!
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185 // Close DART, and exit with error code!
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186 SDL_free (_this->hidden->pMixBuffers);
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187 _this->hidden->pMixBuffers = NULL;
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188 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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189 SDL_SetError ("DART could not allocate buffers");
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190 return (-1);
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191 }
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192 // Ok, we have all the buffers allocated, let's mark them!
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193 {
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194 int i;
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195 for (i = 0; i < iNumBufs; i++) {
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196 pMixBufferDesc pBufferDesc =
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197 (pMixBufferDesc) SDL_malloc (sizeof (tMixBufferDesc));;
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198 // Check if this buffer was really allocated by DART
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199 if ((!(_this->hidden->pMixBuffers[i].pBuffer))
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200 || (!pBufferDesc)) { // Wrong buffer!
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201 // Close DART, and exit with error code!
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202 // Free buffer descriptions
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203 {
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204 int j;
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205 for (j = 0; j < i; j++)
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206 SDL_free ((void *) (_this->hidden->pMixBuffers[j].
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207 ulUserParm));
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208 }
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209 // and cleanup
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210 mciSendCommand (iDeviceOrd, MCI_BUFFER,
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211 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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212 &(_this->hidden->BufferParms), 0);
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213 SDL_free (_this->hidden->pMixBuffers);
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214 _this->hidden->pMixBuffers = NULL;
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215 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT,
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216 &GenericParms, 0);
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217 SDL_SetError ("Error at internal buffer check");
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218 return (-1);
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219 }
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220 pBufferDesc->iBufferUsage = BUFFER_EMPTY;
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221 pBufferDesc->pSDLAudioDevice = _this;
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222
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223 _this->hidden->pMixBuffers[i].ulBufferLength =
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224 _this->hidden->BufferParms.ulBufferSize;
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225 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer
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226 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of
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227 // audio data, but as we will continously send
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228 // audio data, there will be no end.:)
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229 SDL_memset (_this->hidden->pMixBuffers[i].pBuffer, iSilence,
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230 iBufSize);
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231 }
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232 }
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233 _this->hidden->iNextFreeBuffer = 0;
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234 _this->hidden->iLastPlayedBuf = -1;
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235 // Create event semaphore
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236 if (DosCreateEventSem
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237 (NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE) != NO_ERROR)
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238 {
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239 // Could not create event semaphore!
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240 {
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241 int i;
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242 for (i = 0; i < iNumBufs; i++)
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243 SDL_free ((void *) (_this->hidden->pMixBuffers[i].
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244 ulUserParm));
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245 }
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246 mciSendCommand (iDeviceOrd, MCI_BUFFER,
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247 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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248 &(_this->hidden->BufferParms), 0);
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249 SDL_free (_this->hidden->pMixBuffers);
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250 _this->hidden->pMixBuffers = NULL;
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251 mciSendCommand (iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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252 SDL_SetError ("Could not create event semaphore");
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253 return (-1);
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254 }
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255 // Store the new settings in global variables
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256 _this->hidden->iCurrDeviceOrd = iDeviceOrd;
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257 _this->hidden->iCurrFreq = iFreq;
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258 _this->hidden->iCurrBits = iBits;
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259 _this->hidden->iCurrChannels = iChannels;
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260 _this->hidden->iCurrNumBufs = iNumBufs;
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261 _this->hidden->iCurrBufSize = iBufSize;
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262
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263 return (0);
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264 }
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265
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266
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267
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268 void
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269 DART_ThreadInit (_THIS)
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270 {
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271 return;
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272 }
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273
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274 /* This function waits until it is possible to write a full sound buffer */
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275 void
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276 DART_WaitAudio (_THIS)
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277 {
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278 int i;
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279 pMixBufferDesc pBufDesc;
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280 ULONG ulPostCount;
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281
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282 DosResetEventSem (_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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283 // If there is already an empty buffer, then return now!
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284 for (i = 0; i < _this->hidden->iCurrNumBufs; i++) {
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285 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm;
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286 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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287 return;
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288 }
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289 // If there is no empty buffer, wait for one to be empty!
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290 DosWaitEventSem (_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important!
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291 return;
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292 }
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293
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294 void
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295 DART_PlayAudio (_THIS)
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296 {
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297 int iFreeBuf = _this->hidden->iNextFreeBuffer;
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298 pMixBufferDesc pBufDesc;
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299
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300 pBufDesc =
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301 (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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302 pBufDesc->iBufferUsage = BUFFER_USED;
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303 // Send it to DART to be queued
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304 _this->hidden->MixSetupParms.pmixWrite (_this->hidden->MixSetupParms.
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305 ulMixHandle,
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306 &(_this->hidden->
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307 pMixBuffers[iFreeBuf]), 1);
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308
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309 _this->hidden->iLastPlayedBuf = iFreeBuf;
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310 iFreeBuf = (iFreeBuf + 1) % _this->hidden->iCurrNumBufs;
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311 _this->hidden->iNextFreeBuffer = iFreeBuf;
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312 }
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313
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314 Uint8 *
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315 DART_GetAudioBuf (_THIS)
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316 {
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317 int iFreeBuf;
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318 Uint8 *pResult;
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319 pMixBufferDesc pBufDesc;
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320
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321 if (_this) {
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322 if (_this->hidden) {
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323 iFreeBuf = _this->hidden->iNextFreeBuffer;
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324 pBufDesc =
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325 (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].
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326 ulUserParm;
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327
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328 if (pBufDesc) {
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329 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) {
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330 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer;
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331 return pResult;
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332 }
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333 } else
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334 printf ("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n",
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335 pBufDesc);
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336 } else
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337 printf ("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n",
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338 _this->hidden);
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339 } else
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340 printf ("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this);
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341 return NULL;
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342 }
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343
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344 void
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345 DART_WaitDone (_THIS)
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346 {
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347 pMixBufferDesc pBufDesc;
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348 ULONG ulPostCount;
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349 APIRET rc;
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350
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351 pBufDesc =
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352 (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->
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353 iLastPlayedBuf].
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354 ulUserParm;
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355 rc = NO_ERROR;
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356 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc == NO_ERROR)) {
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357 DosResetEventSem (_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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358 rc = DosWaitEventSem (_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important!
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359 }
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360 }
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361
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362 void
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363 DART_CloseAudio (_THIS)
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364 {
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365 MCI_GENERIC_PARMS GenericParms;
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366 int rc;
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367
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368 // Stop DART playback
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369 rc = mciSendCommand (_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT,
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370 &GenericParms, 0);
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371 if (rc != MCIERR_SUCCESS) {
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372 #ifdef SFX_DEBUG_BUILD
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373 printf ("Could not stop DART playback!\n");
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374 fflush (stdout);
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375 #endif
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376 }
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377 // Close event semaphore
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378 DosCloseEventSem (_this->hidden->hevAudioBufferPlayed);
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379
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380 // Free memory of buffer descriptions
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381 {
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382 int i;
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383 for (i = 0; i < _this->hidden->iCurrNumBufs; i++)
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384 SDL_free ((void *) (_this->hidden->pMixBuffers[i].ulUserParm));
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385 }
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386
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387 // Deallocate buffers
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388 rc = mciSendCommand (_this->hidden->iCurrDeviceOrd, MCI_BUFFER,
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389 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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390 &(_this->hidden->BufferParms), 0);
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391
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392 // Free bufferlist
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393 SDL_free (_this->hidden->pMixBuffers);
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394 _this->hidden->pMixBuffers = NULL;
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395
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396 // Close dart
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397 rc = mciSendCommand (_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT,
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398 &(GenericParms), 0);
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399 }
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400
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401 /* Audio driver bootstrap functions */
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402
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403 int
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404 Audio_Available (void)
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405 {
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406 return (1);
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407 }
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408
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409 void
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410 Audio_DeleteDevice (SDL_AudioDevice * device)
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411 {
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412 SDL_free (device->hidden);
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413 SDL_free (device);
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414 }
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415
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416 SDL_AudioDevice *
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417 Audio_CreateDevice (int devindex)
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418 {
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419 SDL_AudioDevice *this;
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420
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421 /* Initialize all variables that we clean on shutdown */
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422 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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423 if (this) {
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424 SDL_memset (this, 0, (sizeof *this));
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425 this->hidden = (struct SDL_PrivateAudioData *)
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426 SDL_malloc ((sizeof *this->hidden));
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427 }
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428 if ((this == NULL) || (this->hidden == NULL)) {
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429 SDL_OutOfMemory ();
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430 if (this)
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431 SDL_free (this);
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432 return (0);
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433 }
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434 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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435
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436 /* Set the function pointers */
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437 this->OpenAudio = DART_OpenAudio;
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438 this->ThreadInit = DART_ThreadInit;
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439 this->WaitAudio = DART_WaitAudio;
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440 this->PlayAudio = DART_PlayAudio;
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441 this->GetAudioBuf = DART_GetAudioBuf;
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442 this->WaitDone = DART_WaitDone;
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443 this->CloseAudio = DART_CloseAudio;
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444
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445 this->free = Audio_DeleteDevice;
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446
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447 return this;
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448 }
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449
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450 AudioBootStrap DART_bootstrap = {
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451 "dart", "OS/2 Direct Audio RouTines (DART)",
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452 Audio_Available, Audio_CreateDevice
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453 };
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454
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455 /* vi: set ts=4 sw=4 expandtab: */