annotate src/audio/dart/SDL_dart.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents c9b51268668f
children 604d73db6802
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
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23 /* Allow access to a raw mixing buffer */
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24
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28
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29 #include "SDL_types.h"
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30 #include "SDL_error.h"
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31 #include "SDL_timer.h"
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32 #include "SDL_audio.h"
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33 #include "SDL_audio_c.h"
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34 #include "SDL_dart.h"
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35
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36 // Buffer states:
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37 #define BUFFER_EMPTY 0
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38 #define BUFFER_USED 1
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39
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40 typedef struct _tMixBufferDesc {
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41 int iBufferUsage; // BUFFER_EMPTY or BUFFER_USED
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42 SDL_AudioDevice *pSDLAudioDevice;
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43 } tMixBufferDesc, *pMixBufferDesc;
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44
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45
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46 //---------------------------------------------------------------------
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47 // DARTEventFunc
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48 //
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49 // This function is called by DART, when an event occures, like end of
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50 // playback of a buffer, etc...
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51 //---------------------------------------------------------------------
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52 LONG APIENTRY DARTEventFunc(ULONG ulStatus,
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53 PMCI_MIX_BUFFER pBuffer,
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54 ULONG ulFlags)
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55 {
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56 if (ulFlags && MIX_WRITE_COMPLETE)
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57 { // Playback of buffer completed!
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58
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59 // Get pointer to buffer description
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60 pMixBufferDesc pBufDesc;
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61
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62 if (pBuffer)
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63 {
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64 pBufDesc = (pMixBufferDesc) (*pBuffer).ulUserParm;
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65
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66 if (pBufDesc)
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67 {
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68 SDL_AudioDevice *pSDLAudioDevice = pBufDesc->pSDLAudioDevice;
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69 // Set the buffer to be empty
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70 pBufDesc->iBufferUsage = BUFFER_EMPTY;
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71 // And notify DART feeder thread that it will have to work a bit.
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72 if (pSDLAudioDevice)
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73 DosPostEventSem(pSDLAudioDevice->hidden->hevAudioBufferPlayed);
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74 }
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75 }
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76 }
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77 return TRUE;
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78 }
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79
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80
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81 int DART_OpenAudio(_THIS, SDL_AudioSpec *spec)
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82 {
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83 MCI_AMP_OPEN_PARMS AmpOpenParms;
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84 MCI_GENERIC_PARMS GenericParms;
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85 int iDeviceOrd = 0; // Default device to be used
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86 int bOpenShared = 1; // Try opening it shared
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87 int iBits = 16; // Default is 16 bits signed
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88 int iFreq = 44100; // Default is 44KHz
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89 int iChannels = 2; // Default is 2 channels (Stereo)
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90 int iNumBufs = 2; // Number of audio buffers: 2
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91 int iBufSize;
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92 int iOpenMode;
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93 int iSilence;
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94 int rc;
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95
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96 // First thing is to try to open a given DART device!
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97 SDL_memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS));
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98 // pszDeviceType should contain the device type in low word, and device ordinal in high word!
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99 AmpOpenParms.pszDeviceType = (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16));
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100
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101 iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID;
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102 if (bOpenShared) iOpenMode |= MCI_OPEN_SHAREABLE;
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103
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104 rc = mciSendCommand( 0, MCI_OPEN,
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105 iOpenMode,
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106 (PVOID) &AmpOpenParms, 0);
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107 if (rc!=MCIERR_SUCCESS) // No audio available??
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108 return (-1);
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109 // Save the device ID we got from DART!
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110 // We will use this in the next calls!
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111 iDeviceOrd = AmpOpenParms.usDeviceID;
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112
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113 // Determine the audio parameters from the AudioSpec
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114 switch ( spec->format & 0xFF )
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115 {
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116 case 8:
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117 /* Unsigned 8 bit audio data */
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118 spec->format = AUDIO_U8;
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119 iSilence = 0x80;
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120 iBits = 8;
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121 break;
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122 case 16:
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123 /* Signed 16 bit audio data */
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124 spec->format = AUDIO_S16;
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125 iSilence = 0x00;
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126 iBits = 16;
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127 break;
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128 default:
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129 // Close DART, and exit with error code!
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130 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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131 SDL_SetError("Unsupported audio format");
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132 return(-1);
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133 }
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134 iFreq = spec->freq;
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135 iChannels = spec->channels;
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136 /* Update the fragment size as size in bytes */
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137 SDL_CalculateAudioSpec(spec);
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138 iBufSize = spec->size;
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139
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140 // Now query this device if it supports the given freq/bits/channels!
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141 SDL_memset(&(_this->hidden->MixSetupParms), 0, sizeof(MCI_MIXSETUP_PARMS));
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142 _this->hidden->MixSetupParms.ulBitsPerSample = iBits;
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143 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
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144 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq;
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145 _this->hidden->MixSetupParms.ulChannels = iChannels;
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146 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY;
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147 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;
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148 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc;
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149 rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP,
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150 MCI_WAIT | MCI_MIXSETUP_QUERYMODE,
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151 &(_this->hidden->MixSetupParms), 0);
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152 if (rc!=MCIERR_SUCCESS)
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153 { // The device cannot handle this format!
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154 // Close DART, and exit with error code!
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155 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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156 SDL_SetError("Audio device doesn't support requested audio format");
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157 return(-1);
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158 }
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159 // The device can handle this format, so initialize!
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160 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
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161 MCI_WAIT | MCI_MIXSETUP_INIT,
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162 &(_this->hidden->MixSetupParms), 0);
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163 if (rc!=MCIERR_SUCCESS)
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164 { // The device could not be opened!
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165 // Close DART, and exit with error code!
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166 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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167 SDL_SetError("Audio device could not be set up");
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168 return(-1);
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169 }
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170 // Ok, the device is initialized.
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171 // Now we should allocate buffers. For this, we need a place where
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172 // the buffer descriptors will be:
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173 _this->hidden->pMixBuffers = (MCI_MIX_BUFFER *) SDL_malloc(sizeof(MCI_MIX_BUFFER)*iNumBufs);
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174 if (!(_this->hidden->pMixBuffers))
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175 { // Not enough memory!
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176 // Close DART, and exit with error code!
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177 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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178 SDL_SetError("Not enough memory for audio buffer descriptors");
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179 return(-1);
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180 }
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181 // Now that we have the place for buffer list, we can ask DART for the
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182 // buffers!
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183 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers
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184 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size
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185 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list
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186 // Allocate buffers!
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187 rc = mciSendCommand(iDeviceOrd, MCI_BUFFER,
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188 MCI_WAIT | MCI_ALLOCATE_MEMORY,
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189 &(_this->hidden->BufferParms), 0);
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190 if ((rc!=MCIERR_SUCCESS) || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers) || (_this->hidden->BufferParms.ulBufferSize==0))
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191 { // Could not allocate memory!
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192 // Close DART, and exit with error code!
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193 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
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194 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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195 SDL_SetError("DART could not allocate buffers");
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196 return(-1);
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197 }
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198 // Ok, we have all the buffers allocated, let's mark them!
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199 {
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200 int i;
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201 for (i=0; i<iNumBufs; i++)
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202 {
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203 pMixBufferDesc pBufferDesc = (pMixBufferDesc) SDL_malloc(sizeof(tMixBufferDesc));;
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204 // Check if this buffer was really allocated by DART
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205 if ((!(_this->hidden->pMixBuffers[i].pBuffer)) || (!pBufferDesc))
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206 { // Wrong buffer!
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207 // Close DART, and exit with error code!
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208 // Free buffer descriptions
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209 { int j;
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210 for (j=0; j<i; j++) SDL_free((void *)(_this->hidden->pMixBuffers[j].ulUserParm));
1190
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211 }
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212 // and cleanup
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213 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0);
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214 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
1190
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215 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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216 SDL_SetError("Error at internal buffer check");
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217 return(-1);
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218 }
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219 pBufferDesc->iBufferUsage = BUFFER_EMPTY;
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220 pBufferDesc->pSDLAudioDevice = _this;
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221
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222 _this->hidden->pMixBuffers[i].ulBufferLength = _this->hidden->BufferParms.ulBufferSize;
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223 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer
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224 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of
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225 // audio data, but as we will continously send
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226 // audio data, there will be no end.:)
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227 SDL_memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence, iBufSize);
1190
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228 }
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229 }
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230 _this->hidden->iNextFreeBuffer = 0;
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231 _this->hidden->iLastPlayedBuf = -1;
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232 // Create event semaphore
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233 if (DosCreateEventSem(NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE)!=NO_ERROR)
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234 {
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235 // Could not create event semaphore!
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236 {
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237 int i;
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238 for (i=0; i<iNumBufs; i++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm));
1190
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239 }
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240 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0);
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241 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
1190
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242 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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243 SDL_SetError("Could not create event semaphore");
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244 return(-1);
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245 }
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246
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247 // Store the new settings in global variables
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248 _this->hidden->iCurrDeviceOrd = iDeviceOrd;
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249 _this->hidden->iCurrFreq = iFreq;
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250 _this->hidden->iCurrBits = iBits;
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251 _this->hidden->iCurrChannels = iChannels;
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252 _this->hidden->iCurrNumBufs = iNumBufs;
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253 _this->hidden->iCurrBufSize = iBufSize;
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254
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255 return (0);
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256 }
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257
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258
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259
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260 void DART_ThreadInit(_THIS)
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261 {
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262 return;
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263 }
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264
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265 /* This function waits until it is possible to write a full sound buffer */
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266 void DART_WaitAudio(_THIS)
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267 {
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268 int i;
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269 pMixBufferDesc pBufDesc;
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270 ULONG ulPostCount;
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271
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272 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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273 // If there is already an empty buffer, then return now!
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274 for (i=0; i<_this->hidden->iCurrNumBufs; i++)
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275 {
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276 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm;
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277 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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278 return;
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279 }
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280 // If there is no empty buffer, wait for one to be empty!
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281 DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important!
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282 return;
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283 }
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284
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285 void DART_PlayAudio(_THIS)
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286 {
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287 int iFreeBuf = _this->hidden->iNextFreeBuffer;
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288 pMixBufferDesc pBufDesc;
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289
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290 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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291 pBufDesc->iBufferUsage = BUFFER_USED;
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292 // Send it to DART to be queued
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293 _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.ulMixHandle,
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294 &(_this->hidden->pMixBuffers[iFreeBuf]), 1);
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295
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296 _this->hidden->iLastPlayedBuf = iFreeBuf;
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297 iFreeBuf = (iFreeBuf+1) % _this->hidden->iCurrNumBufs;
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298 _this->hidden->iNextFreeBuffer = iFreeBuf;
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299 }
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300
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301 Uint8 *DART_GetAudioBuf(_THIS)
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302 {
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303 int iFreeBuf;
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304 Uint8 *pResult;
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305 pMixBufferDesc pBufDesc;
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306
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307 if (_this)
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308 {
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309 if (_this->hidden)
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310 {
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311 iFreeBuf = _this->hidden->iNextFreeBuffer;
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312 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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313
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314 if (pBufDesc)
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315 {
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316 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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317 {
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318 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer;
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319 return pResult;
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320 }
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321 } else
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322 printf("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n", pBufDesc);
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323 } else
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324 printf("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n", _this->hidden);
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325 } else
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326 printf("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this);
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327 return NULL;
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328 }
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329
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330 void DART_WaitDone(_THIS)
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331 {
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332 pMixBufferDesc pBufDesc;
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333 ULONG ulPostCount;
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334 APIRET rc;
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335
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336 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm;
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337 rc = NO_ERROR;
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338 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc==NO_ERROR))
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339 {
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340 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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341 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important!
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342 }
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343 }
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344
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345 void DART_CloseAudio(_THIS)
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346 {
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347 MCI_GENERIC_PARMS GenericParms;
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348 int rc;
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349
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350 // Stop DART playback
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351 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT, &GenericParms, 0);
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352 if (rc!=MCIERR_SUCCESS)
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353 {
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354 #ifdef SFX_DEBUG_BUILD
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355 printf("Could not stop DART playback!\n");
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356 fflush(stdout);
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357 #endif
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358 }
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359
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360 // Close event semaphore
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361 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed);
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362
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363 // Free memory of buffer descriptions
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364 {
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365 int i;
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366 for (i=0; i<_this->hidden->iCurrNumBufs; i++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm));
1190
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367 }
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368
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369 // Deallocate buffers
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370 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0);
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371
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372 // Free bufferlist
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373 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL;
1190
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374
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375 // Close dart
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376 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT, &(GenericParms), 0);
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377 }
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378
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379 /* Audio driver bootstrap functions */
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380
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381 int Audio_Available(void)
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382 {
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383 return(1);
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384 }
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385
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386 void Audio_DeleteDevice(SDL_AudioDevice *device)
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387 {
1336
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388 SDL_free(device->hidden);
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389 SDL_free(device);
1190
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390 }
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391
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392 SDL_AudioDevice *Audio_CreateDevice(int devindex)
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393 {
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diff changeset
394 SDL_AudioDevice *this;
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395
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396 /* Initialize all variables that we clean on shutdown */
1336
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397 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
1190
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398 if ( this )
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diff changeset
399 {
1336
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diff changeset
400 SDL_memset(this, 0, (sizeof *this));
1190
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401 this->hidden = (struct SDL_PrivateAudioData *)
1336
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diff changeset
402 SDL_malloc((sizeof *this->hidden));
1190
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diff changeset
403 }
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diff changeset
404 if ( (this == NULL) || (this->hidden == NULL) )
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parents:
diff changeset
405 {
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diff changeset
406 SDL_OutOfMemory();
173c063d4f55 OS/2 port!
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parents:
diff changeset
407 if ( this )
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
408 SDL_free(this);
1190
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diff changeset
409 return(0);
173c063d4f55 OS/2 port!
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parents:
diff changeset
410 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1312
diff changeset
411 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
1190
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parents:
diff changeset
412
173c063d4f55 OS/2 port!
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parents:
diff changeset
413 /* Set the function pointers */
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diff changeset
414 this->OpenAudio = DART_OpenAudio;
173c063d4f55 OS/2 port!
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parents:
diff changeset
415 this->ThreadInit = DART_ThreadInit;
173c063d4f55 OS/2 port!
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parents:
diff changeset
416 this->WaitAudio = DART_WaitAudio;
173c063d4f55 OS/2 port!
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diff changeset
417 this->PlayAudio = DART_PlayAudio;
173c063d4f55 OS/2 port!
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diff changeset
418 this->GetAudioBuf = DART_GetAudioBuf;
173c063d4f55 OS/2 port!
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parents:
diff changeset
419 this->WaitDone = DART_WaitDone;
173c063d4f55 OS/2 port!
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diff changeset
420 this->CloseAudio = DART_CloseAudio;
173c063d4f55 OS/2 port!
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parents:
diff changeset
421
173c063d4f55 OS/2 port!
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parents:
diff changeset
422 this->free = Audio_DeleteDevice;
173c063d4f55 OS/2 port!
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parents:
diff changeset
423
173c063d4f55 OS/2 port!
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parents:
diff changeset
424 return this;
173c063d4f55 OS/2 port!
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parents:
diff changeset
425 }
173c063d4f55 OS/2 port!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
426
173c063d4f55 OS/2 port!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
427 AudioBootStrap DART_bootstrap = {
173c063d4f55 OS/2 port!
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parents:
diff changeset
428 "dart", "OS/2 Direct Audio RouTines (DART)",
173c063d4f55 OS/2 port!
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parents:
diff changeset
429 Audio_Available, Audio_CreateDevice
173c063d4f55 OS/2 port!
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parents:
diff changeset
430 };
173c063d4f55 OS/2 port!
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parents:
diff changeset
431