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annotate src/audio/dart/SDL_dart.c @ 2001:02108bfd6550

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Actually, my silly logic bug was actually correct. :/
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 31 Aug 2006 23:16:48 +0000
parents dd4b184b3050
children adf732f1f016
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 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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78 int valid_datatype = 0;
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79 MCI_AMP_OPEN_PARMS AmpOpenParms;
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80 MCI_GENERIC_PARMS GenericParms;
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81 int iDeviceOrd = 0; // Default device to be used
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82 int bOpenShared = 1; // Try opening it shared
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83 int iBits = 16; // Default is 16 bits signed
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84 int iFreq = 44100; // Default is 44KHz
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85 int iChannels = 2; // Default is 2 channels (Stereo)
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86 int iNumBufs = 2; // Number of audio buffers: 2
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87 int iBufSize;
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88 int iOpenMode;
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89 int iSilence;
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90 int rc;
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91
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92 // First thing is to try to open a given DART device!
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93 SDL_memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS));
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94 // pszDeviceType should contain the device type in low word, and device ordinal in high word!
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95 AmpOpenParms.pszDeviceType =
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96 (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16));
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97
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98 iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID;
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99 if (bOpenShared)
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100 iOpenMode |= MCI_OPEN_SHAREABLE;
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101
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102 rc = mciSendCommand(0, MCI_OPEN, iOpenMode, (PVOID) & AmpOpenParms, 0);
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103 if (rc != MCIERR_SUCCESS) // No audio available??
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104 return (-1);
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105 // Save the device ID we got from DART!
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106 // We will use this in the next calls!
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107 iDeviceOrd = AmpOpenParms.usDeviceID;
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108
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109 // Determine the audio parameters from the AudioSpec
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110 if (spec->channels > 2)
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111 spec->channels = 2; // !!! FIXME: more than stereo support in OS/2?
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112
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113 while ((!valid_datatype) && (test_format)) {
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114 spec->format = test_format;
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115 valid_datatype = 1;
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116 switch (test_format) {
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117 case AUDIO_U8:
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118 // Unsigned 8 bit audio data
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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
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123 case AUDIO_S16LSB:
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124 // Signed 16 bit audio data
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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
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129 // !!! FIXME: int32?
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130
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131 default:
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132 valid_datatype = 0;
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133 test_format = SDL_NextAudioFormat();
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diff changeset
134 break;
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135 }
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136 }
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137
2001
02108bfd6550 Actually, my silly logic bug was actually correct. :/
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diff changeset
138 if (!valid_datatype) { // shouldn't happen, but just in case...
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139 // Close DART, and exit with error code!
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140 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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141 SDL_SetError("Unsupported audio format");
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142 return (-1);
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143 }
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144
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145 iFreq = spec->freq;
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146 iChannels = spec->channels;
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147 /* Update the fragment size as size in bytes */
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148 SDL_CalculateAudioSpec(spec);
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149 iBufSize = spec->size;
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150
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151 // Now query this device if it supports the given freq/bits/channels!
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152 SDL_memset(&(_this->hidden->MixSetupParms), 0,
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153 sizeof(MCI_MIXSETUP_PARMS));
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154 _this->hidden->MixSetupParms.ulBitsPerSample = iBits;
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155 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
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156 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq;
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157 _this->hidden->MixSetupParms.ulChannels = iChannels;
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158 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY;
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159 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;
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160 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc;
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161 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
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162 MCI_WAIT | MCI_MIXSETUP_QUERYMODE,
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163 &(_this->hidden->MixSetupParms), 0);
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164 if (rc != MCIERR_SUCCESS) { // The device cannot handle this format!
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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 doesn't support requested audio format");
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168 return (-1);
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169 }
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170 // The device can handle this format, so initialize!
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171 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
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172 MCI_WAIT | MCI_MIXSETUP_INIT,
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parents: 1402
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173 &(_this->hidden->MixSetupParms), 0);
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parents: 1402
diff changeset
174 if (rc != MCIERR_SUCCESS) { // The device could not be opened!
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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175 // Close DART, and exit with error code!
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176 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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177 SDL_SetError("Audio device could not be set up");
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178 return (-1);
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179 }
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180 // Ok, the device is initialized.
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181 // Now we should allocate buffers. For this, we need a place where
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182 // the buffer descriptors will be:
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183 _this->hidden->pMixBuffers =
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184 (MCI_MIX_BUFFER *) SDL_malloc(sizeof(MCI_MIX_BUFFER) * iNumBufs);
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parents: 1402
diff changeset
185 if (!(_this->hidden->pMixBuffers)) { // Not enough memory!
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186 // Close DART, and exit with error code!
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187 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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188 SDL_SetError("Not enough memory for audio buffer descriptors");
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189 return (-1);
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190 }
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191 // Now that we have the place for buffer list, we can ask DART for the
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192 // buffers!
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diff changeset
193 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers
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194 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size
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195 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list
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196 // Allocate buffers!
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197 rc = mciSendCommand(iDeviceOrd, MCI_BUFFER,
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198 MCI_WAIT | MCI_ALLOCATE_MEMORY,
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diff changeset
199 &(_this->hidden->BufferParms), 0);
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diff changeset
200 if ((rc != MCIERR_SUCCESS)
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diff changeset
201 || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers)
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diff changeset
202 || (_this->hidden->BufferParms.ulBufferSize == 0)) { // Could not allocate memory!
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
203 // Close DART, and exit with error code!
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diff changeset
204 SDL_free(_this->hidden->pMixBuffers);
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205 _this->hidden->pMixBuffers = NULL;
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diff changeset
206 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
207 SDL_SetError("DART could not allocate buffers");
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diff changeset
208 return (-1);
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diff changeset
209 }
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diff changeset
210 // Ok, we have all the buffers allocated, let's mark them!
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211 {
1895
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diff changeset
212 int i;
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diff changeset
213 for (i = 0; i < iNumBufs; i++) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
214 pMixBufferDesc pBufferDesc =
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diff changeset
215 (pMixBufferDesc) SDL_malloc(sizeof(tMixBufferDesc));;
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diff changeset
216 // Check if this buffer was really allocated by DART
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diff changeset
217 if ((!(_this->hidden->pMixBuffers[i].pBuffer))
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parents: 1402
diff changeset
218 || (!pBufferDesc)) { // Wrong buffer!
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
219 // Close DART, and exit with error code!
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diff changeset
220 // Free buffer descriptions
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
221 {
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diff changeset
222 int j;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
223 for (j = 0; j < i; j++)
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parents: 1402
diff changeset
224 SDL_free((void *) (_this->hidden->pMixBuffers[j].
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diff changeset
225 ulUserParm));
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diff changeset
226 }
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diff changeset
227 // and cleanup
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diff changeset
228 mciSendCommand(iDeviceOrd, MCI_BUFFER,
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diff changeset
229 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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parents: 1402
diff changeset
230 &(_this->hidden->BufferParms), 0);
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parents: 1402
diff changeset
231 SDL_free(_this->hidden->pMixBuffers);
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diff changeset
232 _this->hidden->pMixBuffers = NULL;
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diff changeset
233 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
234 &GenericParms, 0);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
235 SDL_SetError("Error at internal buffer check");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
236 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
237 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
238 pBufferDesc->iBufferUsage = BUFFER_EMPTY;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
239 pBufferDesc->pSDLAudioDevice = _this;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
240
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
241 _this->hidden->pMixBuffers[i].ulBufferLength =
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parents: 1402
diff changeset
242 _this->hidden->BufferParms.ulBufferSize;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
243 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
244 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
245 // audio data, but as we will continously send
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
246 // audio data, there will be no end.:)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
247 SDL_memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
248 iBufSize);
1190
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249 }
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diff changeset
250 }
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251 _this->hidden->iNextFreeBuffer = 0;
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252 _this->hidden->iLastPlayedBuf = -1;
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253 // Create event semaphore
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254 if (DosCreateEventSem
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255 (NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE) != NO_ERROR)
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256 {
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257 // Could not create event semaphore!
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258 {
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259 int i;
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260 for (i = 0; i < iNumBufs; i++)
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261 SDL_free((void *) (_this->hidden->pMixBuffers[i].ulUserParm));
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262 }
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263 mciSendCommand(iDeviceOrd, MCI_BUFFER,
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264 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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265 &(_this->hidden->BufferParms), 0);
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266 SDL_free(_this->hidden->pMixBuffers);
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267 _this->hidden->pMixBuffers = NULL;
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268 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
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269 SDL_SetError("Could not create event semaphore");
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270 return (-1);
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271 }
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272 // Store the new settings in global variables
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273 _this->hidden->iCurrDeviceOrd = iDeviceOrd;
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274 _this->hidden->iCurrFreq = iFreq;
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275 _this->hidden->iCurrBits = iBits;
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276 _this->hidden->iCurrChannels = iChannels;
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277 _this->hidden->iCurrNumBufs = iNumBufs;
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278 _this->hidden->iCurrBufSize = iBufSize;
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279
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280 return (0);
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281 }
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282
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283
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284
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285 void
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286 DART_ThreadInit(_THIS)
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287 {
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288 return;
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289 }
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290
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291 /* This function waits until it is possible to write a full sound buffer */
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292 void
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293 DART_WaitAudio(_THIS)
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294 {
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295 int i;
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296 pMixBufferDesc pBufDesc;
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297 ULONG ulPostCount;
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298
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299 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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300 // If there is already an empty buffer, then return now!
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301 for (i = 0; i < _this->hidden->iCurrNumBufs; i++) {
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302 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm;
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303 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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304 return;
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305 }
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306 // If there is no empty buffer, wait for one to be empty!
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307 DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important!
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308 return;
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309 }
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310
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311 void
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312 DART_PlayAudio(_THIS)
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313 {
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314 int iFreeBuf = _this->hidden->iNextFreeBuffer;
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315 pMixBufferDesc pBufDesc;
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316
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317 pBufDesc =
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318 (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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319 pBufDesc->iBufferUsage = BUFFER_USED;
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320 // Send it to DART to be queued
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321 _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.
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322 ulMixHandle,
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323 &(_this->hidden->
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324 pMixBuffers[iFreeBuf]), 1);
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325
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326 _this->hidden->iLastPlayedBuf = iFreeBuf;
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327 iFreeBuf = (iFreeBuf + 1) % _this->hidden->iCurrNumBufs;
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328 _this->hidden->iNextFreeBuffer = iFreeBuf;
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329 }
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330
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331 Uint8 *
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332 DART_GetAudioBuf(_THIS)
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333 {
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334 int iFreeBuf;
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335 Uint8 *pResult;
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336 pMixBufferDesc pBufDesc;
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337
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338 if (_this) {
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339 if (_this->hidden) {
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340 iFreeBuf = _this->hidden->iNextFreeBuffer;
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341 pBufDesc =
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342 (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].
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343 ulUserParm;
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344
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345 if (pBufDesc) {
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346 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) {
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347 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer;
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348 return pResult;
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349 }
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350 } else
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351 printf("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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352 pBufDesc);
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353 } else
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354 printf("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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355 _this->hidden);
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356 } else
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357 printf("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this);
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358 return NULL;
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359 }
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360
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361 void
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362 DART_WaitDone(_THIS)
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363 {
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364 pMixBufferDesc pBufDesc;
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365 ULONG ulPostCount;
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diff changeset
366 APIRET rc;
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367
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368 pBufDesc =
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369 (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->
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diff changeset
370 iLastPlayedBuf].
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diff changeset
371 ulUserParm;
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diff changeset
372 rc = NO_ERROR;
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diff changeset
373 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc == NO_ERROR)) {
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374 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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375 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important!
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diff changeset
376 }
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377 }
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378
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379 void
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380 DART_CloseAudio(_THIS)
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381 {
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382 MCI_GENERIC_PARMS GenericParms;
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383 int rc;
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384
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385 // Stop DART playback
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386 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT,
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387 &GenericParms, 0);
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388 if (rc != MCIERR_SUCCESS) {
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389 #ifdef SFX_DEBUG_BUILD
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390 printf("Could not stop DART playback!\n");
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391 fflush(stdout);
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392 #endif
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393 }
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394 // Close event semaphore
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395 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed);
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396
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397 // Free memory of buffer descriptions
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398 {
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399 int i;
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400 for (i = 0; i < _this->hidden->iCurrNumBufs; i++)
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401 SDL_free((void *) (_this->hidden->pMixBuffers[i].ulUserParm));
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402 }
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403
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404 // Deallocate buffers
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405 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER,
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406 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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407 &(_this->hidden->BufferParms), 0);
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408
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409 // Free bufferlist
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410 SDL_free(_this->hidden->pMixBuffers);
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411 _this->hidden->pMixBuffers = NULL;
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412
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413 // Close dart
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414 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT,
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415 &(GenericParms), 0);
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416 }
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417
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418 /* Audio driver bootstrap functions */
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419
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420 int
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421 Audio_Available(void)
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422 {
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423 return (1);
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424 }
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425
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426 void
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427 Audio_DeleteDevice(SDL_AudioDevice * device)
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428 {
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429 SDL_free(device->hidden);
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430 SDL_free(device);
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431 }
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432
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433 SDL_AudioDevice *
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434 Audio_CreateDevice(int devindex)
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435 {
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436 SDL_AudioDevice *this;
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437
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438 /* Initialize all variables that we clean on shutdown */
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439 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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440 if (this) {
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441 SDL_memset(this, 0, (sizeof *this));
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442 this->hidden = (struct SDL_PrivateAudioData *)
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443 SDL_malloc((sizeof *this->hidden));
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444 }
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445 if ((this == NULL) || (this->hidden == NULL)) {
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446 SDL_OutOfMemory();
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447 if (this)
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448 SDL_free(this);
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449 return (0);
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450 }
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451 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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452
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453 /* Set the function pointers */
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454 this->OpenAudio = DART_OpenAudio;
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455 this->ThreadInit = DART_ThreadInit;
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456 this->WaitAudio = DART_WaitAudio;
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457 this->PlayAudio = DART_PlayAudio;
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458 this->GetAudioBuf = DART_GetAudioBuf;
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459 this->WaitDone = DART_WaitDone;
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460 this->CloseAudio = DART_CloseAudio;
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461
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462 this->free = Audio_DeleteDevice;
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463
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464 return this;
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465 }
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466
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467 AudioBootStrap DART_bootstrap = {
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468 "dart", "OS/2 Direct Audio RouTines (DART)",
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469 Audio_Available, Audio_CreateDevice
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470 };
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471
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472 /* vi: set ts=4 sw=4 expandtab: */