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1190
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to a raw mixing buffer */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_types.h"
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35 #include "SDL_error.h"
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36 #include "SDL_timer.h"
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37 #include "SDL_audio.h"
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38 #include "SDL_audio_c.h"
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39 #include "SDL_dart.h"
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40
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41 // Buffer states:
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42 #define BUFFER_EMPTY 0
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43 #define BUFFER_USED 1
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44
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45 typedef struct _tMixBufferDesc {
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46 int iBufferUsage; // BUFFER_EMPTY or BUFFER_USED
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47 SDL_AudioDevice *pSDLAudioDevice;
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48 } tMixBufferDesc, *pMixBufferDesc;
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49
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50
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51 //---------------------------------------------------------------------
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52 // DARTEventFunc
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53 //
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54 // This function is called by DART, when an event occures, like end of
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55 // playback of a buffer, etc...
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56 //---------------------------------------------------------------------
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57 LONG APIENTRY DARTEventFunc(ULONG ulStatus,
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58 PMCI_MIX_BUFFER pBuffer,
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59 ULONG ulFlags)
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60 {
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61 if (ulFlags && MIX_WRITE_COMPLETE)
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62 { // Playback of buffer completed!
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63
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64 // Get pointer to buffer description
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65 pMixBufferDesc pBufDesc;
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66
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67 if (pBuffer)
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68 {
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69 pBufDesc = (pMixBufferDesc) (*pBuffer).ulUserParm;
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70
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71 if (pBufDesc)
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72 {
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73 SDL_AudioDevice *pSDLAudioDevice = pBufDesc->pSDLAudioDevice;
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74 // Set the buffer to be empty
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75 pBufDesc->iBufferUsage = BUFFER_EMPTY;
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76 // And notify DART feeder thread that it will have to work a bit.
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77 if (pSDLAudioDevice)
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78 DosPostEventSem(pSDLAudioDevice->hidden->hevAudioBufferPlayed);
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79 }
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80 }
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81 }
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82 return TRUE;
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83 }
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84
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85
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86 int DART_OpenAudio(_THIS, SDL_AudioSpec *spec)
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87 {
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88 MCI_AMP_OPEN_PARMS AmpOpenParms;
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89 MCI_GENERIC_PARMS GenericParms;
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90 int iDeviceOrd = 0; // Default device to be used
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91 int bOpenShared = 1; // Try opening it shared
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92 int iBits = 16; // Default is 16 bits signed
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93 int iFreq = 44100; // Default is 44KHz
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94 int iChannels = 2; // Default is 2 channels (Stereo)
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95 int iNumBufs = 2; // Number of audio buffers: 2
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96 int iBufSize;
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97 int iOpenMode;
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98 int iSilence;
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99 int rc;
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100
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101 // First thing is to try to open a given DART device!
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102 memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS));
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103 // pszDeviceType should contain the device type in low word, and device ordinal in high word!
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104 AmpOpenParms.pszDeviceType = (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16));
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105
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106 iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID;
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107 if (bOpenShared) iOpenMode |= MCI_OPEN_SHAREABLE;
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108
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109 rc = mciSendCommand( 0, MCI_OPEN,
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110 iOpenMode,
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111 (PVOID) &AmpOpenParms, 0);
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112 if (rc!=MCIERR_SUCCESS) // No audio available??
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113 return (-1);
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114 // Save the device ID we got from DART!
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115 // We will use this in the next calls!
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116 iDeviceOrd = AmpOpenParms.usDeviceID;
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117
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118 // Determine the audio parameters from the AudioSpec
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119 switch ( spec->format & 0xFF )
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120 {
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121 case 8:
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122 /* Unsigned 8 bit audio data */
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123 spec->format = AUDIO_U8;
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124 iSilence = 0x80;
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125 iBits = 8;
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126 break;
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127 case 16:
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128 /* Signed 16 bit audio data */
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129 spec->format = AUDIO_S16;
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130 iSilence = 0x00;
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131 iBits = 16;
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132 break;
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133 default:
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134 // Close DART, and exit with error code!
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135 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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136 SDL_SetError("Unsupported audio format");
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137 return(-1);
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138 }
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139 iFreq = spec->freq;
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140 iChannels = spec->channels;
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141 /* Update the fragment size as size in bytes */
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142 SDL_CalculateAudioSpec(spec);
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143 iBufSize = spec->size;
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144
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145 // Now query this device if it supports the given freq/bits/channels!
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146 memset(&(_this->hidden->MixSetupParms), 0, sizeof(MCI_MIXSETUP_PARMS));
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147 _this->hidden->MixSetupParms.ulBitsPerSample = iBits;
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148 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
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149 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq;
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150 _this->hidden->MixSetupParms.ulChannels = iChannels;
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151 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY;
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152 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;
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153 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc;
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154 rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP,
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155 MCI_WAIT | MCI_MIXSETUP_QUERYMODE,
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156 &(_this->hidden->MixSetupParms), 0);
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157 if (rc!=MCIERR_SUCCESS)
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158 { // The device cannot handle this format!
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159 // Close DART, and exit with error code!
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160 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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161 SDL_SetError("Audio device doesn't support requested audio format");
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162 return(-1);
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163 }
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164 // The device can handle this format, so initialize!
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165 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
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166 MCI_WAIT | MCI_MIXSETUP_INIT,
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167 &(_this->hidden->MixSetupParms), 0);
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168 if (rc!=MCIERR_SUCCESS)
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169 { // The device could not be opened!
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170 // Close DART, and exit with error code!
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171 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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172 SDL_SetError("Audio device could not be set up");
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173 return(-1);
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174 }
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175 // Ok, the device is initialized.
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176 // Now we should allocate buffers. For this, we need a place where
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177 // the buffer descriptors will be:
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178 _this->hidden->pMixBuffers = (MCI_MIX_BUFFER *) malloc(sizeof(MCI_MIX_BUFFER)*iNumBufs);
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179 if (!(_this->hidden->pMixBuffers))
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180 { // Not enough memory!
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181 // Close DART, and exit with error code!
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182 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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183 SDL_SetError("Not enough memory for audio buffer descriptors");
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184 return(-1);
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185 }
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186 // Now that we have the place for buffer list, we can ask DART for the
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187 // buffers!
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188 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers
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189 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size
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190 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list
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191 // Allocate buffers!
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192 rc = mciSendCommand(iDeviceOrd, MCI_BUFFER,
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193 MCI_WAIT | MCI_ALLOCATE_MEMORY,
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194 &(_this->hidden->BufferParms), 0);
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195 if ((rc!=MCIERR_SUCCESS) || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers) || (_this->hidden->BufferParms.ulBufferSize==0))
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196 { // Could not allocate memory!
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197 // Close DART, and exit with error code!
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198 free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
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199 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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200 SDL_SetError("DART could not allocate buffers");
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201 return(-1);
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202 }
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203 // Ok, we have all the buffers allocated, let's mark them!
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204 {
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205 int i;
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206 for (i=0; i<iNumBufs; i++)
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207 {
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208 pMixBufferDesc pBufferDesc = (pMixBufferDesc) malloc(sizeof(tMixBufferDesc));;
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209 // Check if this buffer was really allocated by DART
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210 if ((!(_this->hidden->pMixBuffers[i].pBuffer)) || (!pBufferDesc))
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211 { // Wrong buffer!
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212 // Close DART, and exit with error code!
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213 // Free buffer descriptions
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214 { int j;
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215 for (j=0; j<i; j++) free((void *)(_this->hidden->pMixBuffers[j].ulUserParm));
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216 }
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217 // and cleanup
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218 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0);
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219 free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
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220 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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221 SDL_SetError("Error at internal buffer check");
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222 return(-1);
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223 }
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224 pBufferDesc->iBufferUsage = BUFFER_EMPTY;
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225 pBufferDesc->pSDLAudioDevice = _this;
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226
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227 _this->hidden->pMixBuffers[i].ulBufferLength = _this->hidden->BufferParms.ulBufferSize;
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228 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer
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229 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of
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230 // audio data, but as we will continously send
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231 // audio data, there will be no end.:)
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232 memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence, iBufSize);
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233 }
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234 }
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235 _this->hidden->iNextFreeBuffer = 0;
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236 _this->hidden->iLastPlayedBuf = -1;
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237 // Create event semaphore
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238 if (DosCreateEventSem(NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE)!=NO_ERROR)
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239 {
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240 // Could not create event semaphore!
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241 {
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242 int i;
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243 for (i=0; i<iNumBufs; i++) free((void *)(_this->hidden->pMixBuffers[i].ulUserParm));
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244 }
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245 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0);
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246 free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
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247 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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248 SDL_SetError("Could not create event semaphore");
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249 return(-1);
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250 }
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251
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252 // Store the new settings in global variables
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253 _this->hidden->iCurrDeviceOrd = iDeviceOrd;
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254 _this->hidden->iCurrFreq = iFreq;
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255 _this->hidden->iCurrBits = iBits;
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256 _this->hidden->iCurrChannels = iChannels;
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257 _this->hidden->iCurrNumBufs = iNumBufs;
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258 _this->hidden->iCurrBufSize = iBufSize;
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259
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260 return (0);
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261 }
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262
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263
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264
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265 void DART_ThreadInit(_THIS)
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266 {
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267 return;
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268 }
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269
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270 /* This function waits until it is possible to write a full sound buffer */
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271 void DART_WaitAudio(_THIS)
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272 {
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273 int i;
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274 pMixBufferDesc pBufDesc;
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275 ULONG ulPostCount;
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276
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277 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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278 // If there is already an empty buffer, then return now!
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279 for (i=0; i<_this->hidden->iCurrNumBufs; i++)
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280 {
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281 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm;
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282 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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283 return;
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284 }
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285 // If there is no empty buffer, wait for one to be empty!
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286 DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important!
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287 return;
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288 }
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289
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290 void DART_PlayAudio(_THIS)
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291 {
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292 int iFreeBuf = _this->hidden->iNextFreeBuffer;
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293 pMixBufferDesc pBufDesc;
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294
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295 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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296 pBufDesc->iBufferUsage = BUFFER_USED;
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297 // Send it to DART to be queued
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298 _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.ulMixHandle,
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299 &(_this->hidden->pMixBuffers[iFreeBuf]), 1);
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300
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301 _this->hidden->iLastPlayedBuf = iFreeBuf;
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302 iFreeBuf = (iFreeBuf+1) % _this->hidden->iCurrNumBufs;
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303 _this->hidden->iNextFreeBuffer = iFreeBuf;
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304 }
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305
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306 Uint8 *DART_GetAudioBuf(_THIS)
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307 {
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308 int iFreeBuf;
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309 Uint8 *pResult;
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310 pMixBufferDesc pBufDesc;
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311
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312 if (_this)
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313 {
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314 if (_this->hidden)
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315 {
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316 iFreeBuf = _this->hidden->iNextFreeBuffer;
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317 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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318
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319 if (pBufDesc)
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320 {
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321 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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322 {
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323 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer;
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324 return pResult;
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325 }
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326 } else
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327 printf("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n", pBufDesc);
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328 } else
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329 printf("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n", _this->hidden);
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330 } else
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331 printf("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this);
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332 return NULL;
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333 }
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334
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335 void DART_WaitDone(_THIS)
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336 {
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337 pMixBufferDesc pBufDesc;
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338 ULONG ulPostCount;
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339 APIRET rc;
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340
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341 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm;
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342 rc = NO_ERROR;
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343 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc==NO_ERROR))
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344 {
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345 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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346 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important!
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347 }
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348 }
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349
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350 void DART_CloseAudio(_THIS)
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351 {
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352 MCI_GENERIC_PARMS GenericParms;
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353 int rc;
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354
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355 // Stop DART playback
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356 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT, &GenericParms, 0);
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357 if (rc!=MCIERR_SUCCESS)
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358 {
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359 #ifdef SFX_DEBUG_BUILD
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360 printf("Could not stop DART playback!\n");
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361 fflush(stdout);
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362 #endif
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363 }
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364
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365 // Close event semaphore
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366 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed);
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367
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368 // Free memory of buffer descriptions
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369 {
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370 int i;
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371 for (i=0; i<_this->hidden->iCurrNumBufs; i++) free((void *)(_this->hidden->pMixBuffers[i].ulUserParm));
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372 }
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373
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374 // Deallocate buffers
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375 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0);
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376
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377 // Free bufferlist
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378 free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
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379
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380 // Close dart
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381 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT, &(GenericParms), 0);
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382 }
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383
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384 /* Audio driver bootstrap functions */
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385
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386 int Audio_Available(void)
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387 {
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388 return(1);
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389 }
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390
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391 void Audio_DeleteDevice(SDL_AudioDevice *device)
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392 {
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393 free(device->hidden);
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394 free(device);
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395 }
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396
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397 SDL_AudioDevice *Audio_CreateDevice(int devindex)
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398 {
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399 SDL_AudioDevice *this;
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400
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401 /* Initialize all variables that we clean on shutdown */
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402 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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403 if ( this )
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404 {
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405 memset(this, 0, (sizeof *this));
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406 this->hidden = (struct SDL_PrivateAudioData *)
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407 malloc((sizeof *this->hidden));
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408 }
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409 if ( (this == NULL) || (this->hidden == NULL) )
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410 {
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411 SDL_OutOfMemory();
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412 if ( this )
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413 free(this);
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414 return(0);
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415 }
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416 memset(this->hidden, 0, (sizeof *this->hidden));
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417
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418 /* Set the function pointers */
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419 this->OpenAudio = DART_OpenAudio;
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420 this->ThreadInit = DART_ThreadInit;
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421 this->WaitAudio = DART_WaitAudio;
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422 this->PlayAudio = DART_PlayAudio;
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423 this->GetAudioBuf = DART_GetAudioBuf;
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424 this->WaitDone = DART_WaitDone;
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425 this->CloseAudio = DART_CloseAudio;
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426
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427 this->free = Audio_DeleteDevice;
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428
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429 return this;
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|
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430 }
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|
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431
|
|
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432 AudioBootStrap DART_bootstrap = {
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|
|
433 "dart", "OS/2 Direct Audio RouTines (DART)",
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|
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434 Audio_Available, Audio_CreateDevice
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|
|
435 };
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436
|
