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annotate src/audio/dart/SDL_dart.c @ 3096:ae4e80dbe330

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Date: Tue, 17 Feb 2009 14:00:25 +0100 From: Stefan Klug Subject: [SDL] Possible bug, paused audio playing garbage On my WinCE device a paused audio device plays random garbage. This might also be the issue in the thread "sound cracks with SDL_mixer and AUDIO_S16LSB" I don't have that much knowledge of the SDL audio part, but the attached patch fixes it for me, and collapses two redundant ifs. I'm not sure if this is the correct way to fix this. Shouldn't the complete stream conversion part of the RunAudio loop be dependent on the paused property of the device? (not only the call to (*fill)(udata, istream, istream_len). Anyways. Would be great if the patch or a fix could find its way to SVN ;-) Cheers Stefan
author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Mar 2009 05:21:40 +0000
parents 8cc00819c8d6
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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->
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66 hidden->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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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;
1999
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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;
1999
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139
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140 // !!! FIXME: int32?
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141
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diff changeset
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;
1999
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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 }
1999
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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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diff changeset
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->
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316 MixSetupParms.ulMixHandle,
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317 &(_this->
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318 hidden->pMixBuffers[iFreeBuf]),
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319 1);
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320
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321 _this->hidden->iLastPlayedBuf = iFreeBuf;
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322 iFreeBuf = (iFreeBuf + 1) % _this->hidden->iCurrNumBufs;
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323 _this->hidden->iNextFreeBuffer = iFreeBuf;
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324 }
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325
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326 static Uint8 *
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327 DART_GetDeviceBuf(_THIS)
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328 {
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329 int iFreeBuf;
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330 Uint8 *pResult;
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331 pMixBufferDesc pBufDesc;
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332
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333 if (_this) {
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334 if (_this->hidden) {
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335 iFreeBuf = _this->hidden->iNextFreeBuffer;
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336 pBufDesc =
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337 (pMixBufferDesc) _this->hidden->
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338 pMixBuffers[iFreeBuf].ulUserParm;
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339
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340 if (pBufDesc) {
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341 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) {
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342 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer;
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343 return pResult;
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344 }
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345 } else
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346 printf("[DART_GetDeviceBuf] : ERROR! pBufDesc = %p\n",
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347 pBufDesc);
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348 } else
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349 printf("[DART_GetDeviceBuf] : ERROR! _this->hidden = %p\n",
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350 _this->hidden);
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351 } else
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352 printf("[DART_GetDeviceBuf] : ERROR! _this = %p\n", _this);
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353 return NULL;
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354 }
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355
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356 static void
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357 DART_WaitDone(_THIS)
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358 {
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359 pMixBufferDesc pBufDesc;
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360 ULONG ulPostCount = 0;
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361 APIRET rc = NO_ERROR;
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362
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363 pBufDesc = (pMixBufferDesc)
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364 _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm;
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365
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366 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc == NO_ERROR)) {
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367 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount);
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368 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important!
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369 }
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370 }
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371
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372 static void
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373 DART_CloseDevice(_THIS)
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374 {
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375 MCI_GENERIC_PARMS GenericParms;
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376 int rc;
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377 int i;
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378
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379 if (_this->hidden != NULL) {
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380 // Stop DART playback
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381 if (_this->hidden->iCurrDeviceOrd) {
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382 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP,
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383 MCI_WAIT, &GenericParms, 0);
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384 #ifdef SFX_DEBUG_BUILD
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385 if (rc != MCIERR_SUCCESS) {
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386 printf("Could not stop DART playback!\n");
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387 fflush(stdout);
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388 }
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389 #endif
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390 }
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391 // Close event semaphore
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392 if (_this->hidden->hevAudioBufferPlayed) {
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393 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed);
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394 _this->hidden->hevAudioBufferPlayed = 0;
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395 }
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396 // Free memory of buffer descriptions
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397 for (i = 0; i < _this->hidden->iCurrNumBufs; i++) {
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398 SDL_free((void *) (_this->hidden->pMixBuffers[i].ulUserParm));
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399 _this->hidden->pMixBuffers[i].ulUserParm = 0;
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400 }
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401 _this->hidden->iCurrNumBufs = 0;
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402
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403 // Deallocate buffers
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404 if (_this->hidden->iCurrDeviceOrd) {
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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 if (_this->hidden->pMixBuffers != NULL) {
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411 SDL_free(_this->hidden->pMixBuffers);
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412 _this->hidden->pMixBuffers = NULL;
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413 }
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414 // Close dart
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415 if (_this->hidden->iCurrDeviceOrd) {
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416 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE,
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417 MCI_WAIT, &(GenericParms), 0);
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418 }
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419 _this->hidden->iCurrDeviceOrd = 0;
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420
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421 SDL_free(_this->hidden);
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422 _this->hidden = NULL;
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423 }
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424 }
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425
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426
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427 static int
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428 DART_Init(SDL_AudioDriverImpl * impl)
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429 {
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430 /* Set the function pointers */
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431 impl->OpenDevice = DART_OpenDevice;
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432 impl->ThreadInit = DART_ThreadInit;
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433 impl->WaitDevice = DART_WaitDevice;
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434 impl->GetDeviceBuf = DART_GetDeviceBuf;
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435 impl->PlayDevice = DART_PlayDevice;
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436 impl->WaitDone = DART_WaitDone;
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437 impl->CloseDevice = DART_CloseDevice;
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438 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: is this right? */
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439
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440 return 1;
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441 }
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442
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443
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444 AudioBootStrap DART_bootstrap = {
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445 "dart", "OS/2 Direct Audio RouTines (DART)", DART_Init, 0
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446 };
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447
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448 /* vi: set ts=4 sw=4 expandtab: */