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annotate src/audio/mint/SDL_mintaudio_dma8.c @ 1023:e719ee25439d

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Fix potential use of freed memory in the threaded timer system
author Sam Lantinga <slouken@libsdl.org>
date Tue, 04 Jan 2005 19:05:32 +0000
parents 176240cf4405
children 2911ff0a32bb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /*
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24 MiNT audio driver
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25 using DMA 8bits (hardware access)
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26
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27 Patrice Mandin
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28 */
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29
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30 #include <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 /* Mint includes */
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35 #include <mint/osbind.h>
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36 #include <mint/falcon.h>
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37 #include <mint/cookie.h>
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38
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39 #include "SDL_endian.h"
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40 #include "SDL_audio.h"
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41 #include "SDL_audio_c.h"
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42 #include "SDL_audiomem.h"
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43 #include "SDL_sysaudio.h"
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44
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45 #include "SDL_atarimxalloc_c.h"
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46
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47 #include "SDL_mintaudio.h"
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48 #include "SDL_mintaudio_dma8.h"
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49
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50 /*--- Defines ---*/
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51
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52 #define MINT_AUDIO_DRIVER_NAME "mint_dma8"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:dma8: "
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56 #if 0
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57 #define DEBUG_PRINT(what) \
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58 { \
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59 printf what; \
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60 }
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61 #else
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62 #define DEBUG_PRINT(what)
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63 #endif
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64
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65 /*--- Static variables ---*/
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66
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67 static unsigned long cookie_snd, cookie_mch;
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68
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69 /*--- Audio driver functions ---*/
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70
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71 static void Mint_CloseAudio(_THIS);
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72 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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73 static void Mint_LockAudio(_THIS);
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74 static void Mint_UnlockAudio(_THIS);
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75
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76 /* To check/init hardware audio */
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77 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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78 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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79
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80 /*--- Audio driver bootstrap functions ---*/
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81
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82 static int Audio_Available(void)
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83 {
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84 const char *envr = getenv("SDL_AUDIODRIVER");
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85
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86 /* Check if user asked a different audio driver */
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87 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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88 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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89 return 0;
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90 }
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91
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92 /* Cookie _MCH present ? if not, assume ST machine */
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93 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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94 cookie_mch = MCH_ST;
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95 }
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96
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97 /* Cookie _SND present ? if not, assume ST machine */
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98 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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99 cookie_snd = SND_PSG;
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100 }
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101
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102 /* Check if we have 8 bits audio */
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103 /*
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104 if ((cookie_snd & SND_8BIT)==0) {
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105 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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106 return(0);
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107 }
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108 */
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109 if ((cookie_mch>>16)>MCH_F30) {
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110 DEBUG_PRINT((DEBUG_NAME "unknown 8 bits audio chip\n"));
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111 return 0;
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112 }
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113
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114 /* Check if audio is lockable */
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115 if ((cookie_mch>>16) == MCH_F30) {
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116 if (Locksnd()!=1) {
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117 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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118 return(0);
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119 }
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120
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121 Unlocksnd();
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122 }
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123
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124 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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125 return(1);
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126 }
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127
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128 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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129 {
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130 free(device->hidden);
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131 free(device);
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132 }
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133
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134 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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135 {
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136 SDL_AudioDevice *this;
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137
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138 /* Initialize all variables that we clean on shutdown */
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139 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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140 if ( this ) {
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141 memset(this, 0, (sizeof *this));
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142 this->hidden = (struct SDL_PrivateAudioData *)
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143 malloc((sizeof *this->hidden));
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144 }
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145 if ( (this == NULL) || (this->hidden == NULL) ) {
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146 SDL_OutOfMemory();
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147 if ( this ) {
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148 free(this);
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149 }
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150 return(0);
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151 }
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152 memset(this->hidden, 0, (sizeof *this->hidden));
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153
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154 /* Set the function pointers */
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diff changeset
155 this->OpenAudio = Mint_OpenAudio;
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156 this->CloseAudio = Mint_CloseAudio;
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157 this->LockAudio = Mint_LockAudio;
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158 this->UnlockAudio = Mint_UnlockAudio;
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diff changeset
159 this->free = Audio_DeleteDevice;
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160
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161 return this;
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162 }
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163
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164 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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165 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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166 Audio_Available, Audio_CreateDevice
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167 };
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168
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169 static void Mint_LockAudio(_THIS)
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170 {
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171 void *oldpile;
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172
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173 /* Stop replay */
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174 oldpile=(void *)Super(0);
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175 DMAAUDIO_IO.control=0;
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176 Super(oldpile);
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177 }
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178
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179 static void Mint_UnlockAudio(_THIS)
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180 {
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181 void *oldpile;
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182
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183 /* Restart replay */
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184 oldpile=(void *)Super(0);
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185 DMAAUDIO_IO.control=3;
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186 Super(oldpile);
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187 }
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188
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189 static void Mint_CloseAudio(_THIS)
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190 {
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191 void *oldpile;
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192
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193 /* Stop replay */
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194 oldpile=(void *)Super(0);
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195 DMAAUDIO_IO.control=0;
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196 Super(oldpile);
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197
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198 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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199
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200 /* Disable interrupt */
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201 Jdisint(MFP_DMASOUND);
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202
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203 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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204
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205 /* Wait if currently playing sound */
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206 while (SDL_MintAudio_mutex != 0) {
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207 }
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208
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209 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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210
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211 /* Clear buffers */
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212 if (SDL_MintAudio_audiobuf[0]) {
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213 Mfree(SDL_MintAudio_audiobuf[0]);
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214 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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215 }
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216
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217 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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218 }
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219
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220 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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221 {
961
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222 int i, masterprediv, sfreq;
644
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223 unsigned long masterclock;
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224
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225 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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226 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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227 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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228 DEBUG_PRINT(("channels=%d, ", spec->channels));
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229 DEBUG_PRINT(("freq=%d\n", spec->freq));
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230
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231 /* Check formats available */
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232 spec->format = AUDIO_S8;
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233
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234 /* Calculate and select the closest frequency */
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235 sfreq=0;
644
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236 masterclock=MASTERCLOCK_STE;
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237 masterprediv=MASTERPREDIV_STE;
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diff changeset
238 switch(cookie_mch>>16) {
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diff changeset
239 /*
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240 case MCH_STE:
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241 masterclock=MASTERCLOCK_STE;
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242 masterprediv=MASTERPREDIV_STE;
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243 break;
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244 */
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245 case MCH_TT:
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246 masterclock=MASTERCLOCK_TT;
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247 masterprediv=MASTERPREDIV_TT;
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248 break;
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diff changeset
249 case MCH_F30:
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250 masterclock=MASTERCLOCK_FALCON1;
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251 masterprediv=MASTERPREDIV_FALCON;
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252 sfreq=1;
644
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253 break;
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254 }
961
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255
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
256 MINTAUDIO_freqcount=0;
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diff changeset
257 for (i=sfreq;i<4;i++) {
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diff changeset
258 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), masterclock, i-sfreq);
644
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259 }
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diff changeset
260
961
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261 #if 1
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262 for (i=0; i<MINTAUDIO_freqcount; i++) {
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263 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
264 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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diff changeset
265 MINTAUDIO_frequencies[i].predivisor
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266 ));
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267 }
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268 #endif
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269
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270 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
271 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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272
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273 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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274 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
275 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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276 DEBUG_PRINT(("channels=%d, ", spec->channels));
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277 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
278
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279 return 0;
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280 }
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281
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282 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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283 {
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284 void *oldpile;
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285 unsigned long buffer;
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286 unsigned char mode;
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287
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288 /* Set replay tracks */
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diff changeset
289 if (cookie_snd & SND_16BIT) {
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290 Settracks(0,0);
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291 Setmontracks(0);
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diff changeset
292 }
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293
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294 oldpile=(void *)Super(0);
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295
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diff changeset
296 /* Stop currently playing sound */
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297 DMAAUDIO_IO.control=0;
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298
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diff changeset
299 /* Set buffer */
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300 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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301 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
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302 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
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303 DMAAUDIO_IO.start_low = buffer & 255;
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304
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305 buffer += SDL_MintAudio_audiosize;
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306 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
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307 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
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308 DMAAUDIO_IO.end_low = buffer & 255;
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309
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310 mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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311 if (spec->channels==1) {
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312 mode |= 1<<7;
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313 }
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314 DMAAUDIO_IO.sound_ctrl = mode;
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315
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316 /* Set interrupt */
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317 Jdisint(MFP_DMASOUND);
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318 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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319 Jenabint(MFP_DMASOUND);
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320
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321 /* Go */
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322 DMAAUDIO_IO.control = 3; /* playback + repeat */
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323
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324 Super(oldpile);
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325 }
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326
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327 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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328 {
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329 SDL_MintAudio_device = this;
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330
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331 /* Check audio capabilities */
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332 if (Mint_CheckAudio(this, spec)==-1) {
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333 return -1;
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334 }
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335
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336 SDL_CalculateAudioSpec(spec);
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337
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338 /* Allocate memory for audio buffers in DMA-able RAM */
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339 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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340
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341 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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342 if (SDL_MintAudio_audiobuf[0]==NULL) {
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343 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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344 return (-1);
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345 }
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346 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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347 SDL_MintAudio_numbuf=0;
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348 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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349 SDL_MintAudio_audiosize = spec->size;
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350 SDL_MintAudio_mutex = 0;
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351
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352 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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353 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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354
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355 /* Setup audio hardware */
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356 Mint_InitAudio(this, spec);
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357
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358 return(1); /* We don't use threaded audio */
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359 }