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annotate src/audio/dart/SDL_dart.c @ 2218:6cc82cad8b77

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1.3 video API design chat
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Aug 2007 07:08:25 +0000
parents 866052b01ee5
children e1da92da346c
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 occurs, like end of
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46 // playback of a buffer, etc...
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47 //---------------------------------------------------------------------
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48 static 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 static int
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75 DART_OpenDevice(_THIS, const char *devname, int iscapture)
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76 {
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77 SDL_AudioFormat test_format = SDL_FirstAudioFormat(_this->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 int iDeviceOrd = 0; // Default device to be used
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81 int bOpenShared = 1; // Try opening it shared
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82 int iBits = 16; // Default is 16 bits signed
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83 int iFreq = 44100; // Default is 44KHz
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84 int iChannels = 2; // Default is 2 channels (Stereo)
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85 int iNumBufs = 2; // Number of audio buffers: 2
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86 int iBufSize;
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87 int iOpenMode;
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88 int iSilence;
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89 int rc;
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90
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91 /* Initialize all variables that we clean on shutdown */
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92 _this->hidden = (struct SDL_PrivateAudioData *)
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93 SDL_malloc((sizeof *_this->hidden));
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94 if (_this->hidden == NULL) {
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95 SDL_OutOfMemory();
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96 return 0;
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97 }
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98 SDL_memset(_this->hidden, 0, (sizeof *_this->hidden));
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99
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100 // First thing is to try to open a given DART device!
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101 SDL_memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS));
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102 // pszDeviceType should contain the device type in low word, and device ordinal in high word!
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103 AmpOpenParms.pszDeviceType =
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104 (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)
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108 iOpenMode |= MCI_OPEN_SHAREABLE;
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109
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110 rc = mciSendCommand(0, MCI_OPEN, iOpenMode, (PVOID) & AmpOpenParms, 0);
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111 if (rc != MCIERR_SUCCESS) { // No audio available??
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112 DART_CloseDevice(_this);
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113 SDL_SetError("DART: Couldn't open audio device.");
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114 return 0;
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115 }
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116 // Save the device ID we got from DART!
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117 // We will use this in the next calls!
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118 _this->hidden->iCurrDeviceOrd = iDeviceOrd = AmpOpenParms.usDeviceID;
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119
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120 // Determine the audio parameters from the AudioSpec
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121 if (_this->spec.channels > 4)
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122 _this->spec.channels = 4;
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123
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124 while ((!valid_datatype) && (test_format)) {
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125 _this->spec.format = test_format;
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126 valid_datatype = 1;
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127 switch (test_format) {
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128 case AUDIO_U8:
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129 // Unsigned 8 bit audio data
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130 iSilence = 0x80;
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131 _this->hidden->iCurrBits = iBits = 8;
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132 break;
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133
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134 case AUDIO_S16LSB:
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135 // Signed 16 bit audio data
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136 iSilence = 0x00;
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137 _this->hidden->iCurrBits = iBits = 16;
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138 break;
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139
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140 // !!! FIXME: int32?
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141
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142 default:
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143 valid_datatype = 0;
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144 test_format = SDL_NextAudioFormat();
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145 break;
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146 }
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147 }
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148
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149 if (!valid_datatype) { // shouldn't happen, but just in case...
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150 // Close DART, and exit with error code!
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151 DART_CloseDevice(_this);
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152 SDL_SetError("Unsupported audio format");
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153 return 0;
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154 }
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155
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156 _this->hidden->iCurrFreq = iFreq = _this->spec.freq;
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157 _this->hidden->iCurrChannels = iChannels = _this->spec.channels;
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158 /* Update the fragment size as size in bytes */
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159 SDL_CalculateAudioSpec(&_this->spec);
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160 _this->hidden->iCurrBufSize = iBufSize = _this->spec.size;
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161
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162 // Now query this device if it supports the given freq/bits/channels!
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163 SDL_memset(&(_this->hidden->MixSetupParms), 0,
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164 sizeof(MCI_MIXSETUP_PARMS));
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165 _this->hidden->MixSetupParms.ulBitsPerSample = iBits;
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166 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
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167 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq;
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168 _this->hidden->MixSetupParms.ulChannels = iChannels;
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169 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY;
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170 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;
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171 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc;
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172 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
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173 MCI_WAIT | MCI_MIXSETUP_QUERYMODE,
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174 &(_this->hidden->MixSetupParms), 0);
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175 if (rc != MCIERR_SUCCESS) { // The device cannot handle this format!
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176 // Close DART, and exit with error code!
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177 DART_CloseDevice(_this);
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178 SDL_SetError("Audio device doesn't support requested audio format");
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179 return 0;
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180 }
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181 // The device can handle this format, so initialize!
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182 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
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183 MCI_WAIT | MCI_MIXSETUP_INIT,
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184 &(_this->hidden->MixSetupParms), 0);
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185 if (rc != MCIERR_SUCCESS) { // The device could not be opened!
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186 // Close DART, and exit with error code!
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187 DART_CloseDevice(_this);
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188 SDL_SetError("Audio device could not be set up");
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189 return 0;
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190 }
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191 // Ok, the device is initialized.
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192 // Now we should allocate buffers. For this, we need a place where
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193 // the buffer descriptors will be:
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194 _this->hidden->pMixBuffers =
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195 (MCI_MIX_BUFFER *) SDL_malloc(sizeof(MCI_MIX_BUFFER) * iNumBufs);
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196 if (!(_this->hidden->pMixBuffers)) { // Not enough memory!
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197 // Close DART, and exit with error code!
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198 DART_CloseDevice(_this);
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199 SDL_OutOfMemory();
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200 return 0;
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201 }
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202 // Now that we have the place for buffer list, we can ask DART for the
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203 // buffers!
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204 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers
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205 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size
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206 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list
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207 // Allocate buffers!
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208 rc = mciSendCommand(iDeviceOrd, MCI_BUFFER,
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209 MCI_WAIT | MCI_ALLOCATE_MEMORY,
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210 &(_this->hidden->BufferParms), 0);
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211 if ((rc != MCIERR_SUCCESS)
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212 || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers)
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213 || (_this->hidden->BufferParms.ulBufferSize == 0)) { // Could not allocate memory!
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214 // Close DART, and exit with error code!
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215 DART_CloseDevice(_this);
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216 SDL_SetError("DART could not allocate buffers");
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217 return 0;
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218 }
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219 _this->hidden->iCurrNumBufs = iNumBufs;
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220
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221 // Ok, we have all the buffers allocated, let's mark them!
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222 {
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223 int i;
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224 for (i = 0; i < iNumBufs; i++) {
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225 pMixBufferDesc pBufferDesc =
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226 (pMixBufferDesc) SDL_malloc(sizeof(tMixBufferDesc));;
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227 // Check if this buffer was really allocated by DART
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228 if ((!(_this->hidden->pMixBuffers[i].pBuffer))
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229 || (!pBufferDesc)) { // Wrong buffer!
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230 DART_CloseDevice(_this);
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231 SDL_SetError("Error at internal buffer check");
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232 return 0;
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233 }
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234 pBufferDesc->iBufferUsage = BUFFER_EMPTY;
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235 pBufferDesc->pSDLAudioDevice = _this;
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236
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237 _this->hidden->pMixBuffers[i].ulBufferLength =
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238 _this->hidden->BufferParms.ulBufferSize;
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239 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer
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240 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of
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241 // audio data, but as we will continously send
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242 // audio data, there will be no end.:)
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243 SDL_memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence,
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244 iBufSize);
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245 }
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246 }
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247 _this->hidden->iNextFreeBuffer = 0;
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248 _this->hidden->iLastPlayedBuf = -1;
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249 // Create event semaphore
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250 if (DosCreateEventSem
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251 (NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE) != NO_ERROR)
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252 {
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253 DART_CloseDevice(_this);
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254 SDL_SetError("Could not create event semaphore");
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255 return 0;
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256 }
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257
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258 return 1;
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259 }
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260
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261 static void
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262 DART_ThreadInit(_THIS)
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263 {
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264 /* Increase the priority of this thread to make sure that
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265 the audio will be continuous all the time! */
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266 #ifdef USE_DOSSETPRIORITY
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267 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) {
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268 #ifdef DEBUG_BUILD
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269 printf
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270 ("[DART_ThreadInit] : Setting priority to TimeCritical+0! (TID%d)\n",
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271 SDL_ThreadID());
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272 #endif
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273 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
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274 } else {
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275 #ifdef DEBUG_BUILD
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276 printf
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277 ("[DART_ThreadInit] : Setting priority to ForegroundServer+0! (TID%d)\n",
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278 SDL_ThreadID());
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279 #endif
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280 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0);
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281 }
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282 #endif
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283 }
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284
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285 /* This function waits until it is possible to write a full sound buffer */
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286 static void
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287 DART_WaitDevice(_THIS)
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288 {
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289 int i;
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290 pMixBufferDesc pBufDesc;
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291 ULONG ulPostCount;
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292
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293 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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294 // If there is already an empty buffer, then return now!
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295 for (i = 0; i < _this->hidden->iCurrNumBufs; i++) {
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296 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm;
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297 if (pBufDesc->iBufferUsage == BUFFER_EMPTY)
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298 return;
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299 }
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300 // If there is no empty buffer, wait for one to be empty!
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301 DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important!
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302 return;
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303 }
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304
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305 static void
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306 DART_PlayDevice(_THIS)
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307 {
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308 int iFreeBuf = _this->hidden->iNextFreeBuffer;
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309 pMixBufferDesc pBufDesc;
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310
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311 pBufDesc =
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312 (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm;
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313 pBufDesc->iBufferUsage = BUFFER_USED;
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314 // Send it to DART to be queued
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315 _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.
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316 ulMixHandle,
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317 &(_this->hidden->
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318 pMixBuffers[iFreeBuf]), 1);
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319
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320 _this->hidden->iLastPlayedBuf = iFreeBuf;
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321 iFreeBuf = (iFreeBuf + 1) % _this->hidden->iCurrNumBufs;
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322 _this->hidden->iNextFreeBuffer = iFreeBuf;
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323 }
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324
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325 static Uint8 *
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326 DART_GetDeviceBuf(_THIS)
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327 {
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328 int iFreeBuf;
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329 Uint8 *pResult;
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330 pMixBufferDesc pBufDesc;
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331
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332 if (_this) {
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333 if (_this->hidden) {
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334 iFreeBuf = _this->hidden->iNextFreeBuffer;
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335 pBufDesc =
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336 (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].
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337 ulUserParm;
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338
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339 if (pBufDesc) {
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340 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) {
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341 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer;
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342 return pResult;
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343 }
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344 } else
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345 printf("[DART_GetDeviceBuf] : ERROR! pBufDesc = %p\n",
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346 pBufDesc);
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347 } else
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348 printf("[DART_GetDeviceBuf] : ERROR! _this->hidden = %p\n",
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349 _this->hidden);
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350 } else
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351 printf("[DART_GetDeviceBuf] : ERROR! _this = %p\n", _this);
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352 return NULL;
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353 }
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354
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355 static void
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356 DART_WaitDone(_THIS)
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357 {
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358 pMixBufferDesc pBufDesc;
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359 ULONG ulPostCount = 0;
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360 APIRET rc = NO_ERROR;
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361
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362 pBufDesc = (pMixBufferDesc)
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363 _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm;
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364
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365 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc == NO_ERROR)) {
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366 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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367 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important!
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368 }
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369 }
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370
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371 static void
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372 DART_CloseDevice(_THIS)
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373 {
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374 MCI_GENERIC_PARMS GenericParms;
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375 int rc;
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376 int i;
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377
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378 if (_this->hidden != NULL) {
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379 // Stop DART playback
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380 if (_this->hidden->iCurrDeviceOrd) {
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381 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP,
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382 MCI_WAIT, &GenericParms, 0);
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383 #ifdef SFX_DEBUG_BUILD
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384 if (rc != MCIERR_SUCCESS) {
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385 printf("Could not stop DART playback!\n");
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386 fflush(stdout);
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387 }
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388 #endif
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389 }
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390 // Close event semaphore
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391 if (_this->hidden->hevAudioBufferPlayed) {
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392 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed);
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393 _this->hidden->hevAudioBufferPlayed = 0;
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394 }
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395 // Free memory of buffer descriptions
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396 for (i = 0; i < _this->hidden->iCurrNumBufs; i++) {
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397 SDL_free((void *) (_this->hidden->pMixBuffers[i].ulUserParm));
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398 _this->hidden->pMixBuffers[i].ulUserParm = 0;
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399 }
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400 _this->hidden->iCurrNumBufs = 0;
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401
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402 // Deallocate buffers
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403 if (_this->hidden->iCurrDeviceOrd) {
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404 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER,
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405 MCI_WAIT | MCI_DEALLOCATE_MEMORY,
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406 &(_this->hidden->BufferParms), 0);
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407 }
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408 // Free bufferlist
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409 if (_this->hidden->pMixBuffers != NULL) {
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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 if (_this->hidden->iCurrDeviceOrd) {
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415 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE,
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416 MCI_WAIT, &(GenericParms), 0);
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417 }
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418 _this->hidden->iCurrDeviceOrd = 0;
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419
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420 SDL_free(_this->hidden);
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421 _this->hidden = NULL;
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422 }
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423 }
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424
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425
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426 static int
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427 DART_Init(SDL_AudioDriverImpl * impl)
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428 {
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429 /* Set the function pointers */
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430 impl->OpenDevice = DART_OpenDevice;
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431 impl->ThreadInit = DART_ThreadInit;
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432 impl->WaitDevice = DART_WaitDevice;
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433 impl->GetDeviceBuf = DART_GetDeviceBuf;
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434 impl->PlayDevice = DART_PlayDevice;
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435 impl->WaitDone = DART_WaitDone;
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436 impl->CloseDevice = DART_CloseDevice;
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437 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: is this right? */
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438
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439 return 1;
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440 }
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441
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442
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443 AudioBootStrap DART_bootstrap = {
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444 "dart", "OS/2 Direct Audio RouTines (DART)", DART_Init, 0
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445 };
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446
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447 /* vi: set ts=4 sw=4 expandtab: */