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annotate src/audio/mint/SDL_mintaudio_mcsn.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 f10892fa2e48
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 XBIOS functions (MacSound compatible driver)
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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_mcsn.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_mcsn"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:mcsn: "
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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 static cookie_mcsn_t *cookie_mcsn;
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69
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70 /*--- Audio driver functions ---*/
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71
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72 static void Mint_CloseAudio(_THIS);
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73 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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74 static void Mint_LockAudio(_THIS);
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75 static void Mint_UnlockAudio(_THIS);
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76
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77 /* To check/init hardware audio */
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78 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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79 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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80
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81 /*--- Audio driver bootstrap functions ---*/
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82
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83 static int Audio_Available(void)
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84 {
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85 const char *envr = getenv("SDL_AUDIODRIVER");
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86
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87 /* Check if user asked a different audio driver */
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88 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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89 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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90 return(0);
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91 }
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92
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93 /* Cookie _MCH present ? if not, assume ST machine */
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94 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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95 cookie_mch = MCH_ST;
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96 }
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97
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98 /* Cookie _SND present ? if not, assume ST machine */
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99 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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100 cookie_snd = SND_PSG;
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101 }
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102
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103 /* Check if we have 16 bits audio */
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104 if ((cookie_snd & SND_16BIT)==0) {
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105 DEBUG_PRINT((DEBUG_NAME "no 16 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 /* Cookie MCSN present ? */
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110 if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
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111 DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
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112 return(0);
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113 }
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114
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115 /* Check if interrupt at end of replay */
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116 if (cookie_mcsn->pint == 0) {
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117 DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
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118 return(0);
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119 }
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120
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121 /* Check if audio is lockable */
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122 if (Locksnd()!=1) {
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123 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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124 return(0);
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125 }
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126
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127 Unlocksnd();
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128
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129 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
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130 return(1);
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131 }
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132
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133 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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134 {
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135 free(device->hidden);
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136 free(device);
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137 }
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138
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139 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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140 {
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141 SDL_AudioDevice *this;
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142
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143 /* Initialize all variables that we clean on shutdown */
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144 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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145 if ( this ) {
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146 memset(this, 0, (sizeof *this));
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147 this->hidden = (struct SDL_PrivateAudioData *)
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148 malloc((sizeof *this->hidden));
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149 }
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150 if ( (this == NULL) || (this->hidden == NULL) ) {
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151 SDL_OutOfMemory();
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diff changeset
152 if ( this ) {
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153 free(this);
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154 }
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155 return(0);
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diff changeset
156 }
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diff changeset
157 memset(this->hidden, 0, (sizeof *this->hidden));
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158
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diff changeset
159 /* Set the function pointers */
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diff changeset
160 this->OpenAudio = Mint_OpenAudio;
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161 this->CloseAudio = Mint_CloseAudio;
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diff changeset
162 this->LockAudio = Mint_LockAudio;
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163 this->UnlockAudio = Mint_UnlockAudio;
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164 this->free = Audio_DeleteDevice;
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165
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166 return this;
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167 }
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168
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169 AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
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170 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
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171 Audio_Available, Audio_CreateDevice
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172 };
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173
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174 static void Mint_LockAudio(_THIS)
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175 {
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176 /* Stop replay */
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177 Buffoper(0);
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178 }
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179
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180 static void Mint_UnlockAudio(_THIS)
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181 {
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182 /* Restart replay */
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183 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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184 }
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185
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186 static void Mint_CloseAudio(_THIS)
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187 {
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188 /* Stop replay */
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189 Buffoper(0);
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190
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191 /* Uninstall interrupt */
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192 Jdisint(MFP_DMASOUND);
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193
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194 /* Wait if currently playing sound */
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195 while (SDL_MintAudio_mutex != 0) {
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196 }
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197
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198 /* Clear buffers */
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199 if (SDL_MintAudio_audiobuf[0]) {
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200 Mfree(SDL_MintAudio_audiobuf[0]);
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201 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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202 }
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203
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204 /* Unlock sound system */
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205 Unlocksnd();
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206 }
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207
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208 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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209 {
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210 int i;
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211 unsigned long masterclock, masterprediv;
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212
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213 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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214 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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215 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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216 DEBUG_PRINT(("channels=%d, ", spec->channels));
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217 DEBUG_PRINT(("freq=%d\n", spec->freq));
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218
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219 /* Check formats available */
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220 MINTAUDIO_freqcount=0;
644
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221 switch(cookie_mcsn->play) {
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222 case MCSN_ST:
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223 spec->channels=1;
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224 spec->format=8; /* FIXME: is it signed or unsigned ? */
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225 SDL_MintAudio_AddFrequency(this, 12500, 0, 0);
644
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226 break;
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227 case MCSN_TT: /* Also STE, Mega STE */
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228 spec->format=AUDIO_S8;
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229 masterclock=MASTERCLOCK_STE;
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230 masterprediv=MASTERPREDIV_STE;
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231 if ((cookie_mch>>16)==MCH_TT) {
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diff changeset
232 masterclock=MASTERCLOCK_TT;
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233 masterprediv=MASTERPREDIV_TT;
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234 }
961
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diff changeset
235 for (i=0; i<4; i++) {
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diff changeset
236 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), masterclock, 3-i);
644
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237 }
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diff changeset
238 break;
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diff changeset
239 case MCSN_FALCON: /* Also Mac */
961
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diff changeset
240 for (i=1; i<12; i++) {
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diff changeset
241 /* Remove unusable Falcon codec predivisors */
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diff changeset
242 if ((i==6) || (i==8) || (i==10)) {
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diff changeset
243 continue;
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diff changeset
244 }
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diff changeset
245 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), CLK25M, i+1);
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diff changeset
246 }
644
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diff changeset
247 if (cookie_mcsn->res1 != 0) {
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diff changeset
248 for (i=1; i<4; i++) {
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diff changeset
249 SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)), CLKEXT, (1<<i)-1);
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diff changeset
250 }
644
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diff changeset
251 }
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diff changeset
252 spec->format |= 0x8000; /* Audio is always signed */
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diff changeset
253 if ((spec->format & 0x00ff)==16) {
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diff changeset
254 spec->format |= 0x1000; /* Audio is always big endian */
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diff changeset
255 spec->channels=2; /* 16 bits always stereo */
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diff changeset
256 }
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diff changeset
257 break;
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diff changeset
258 }
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diff changeset
259
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diff changeset
260 #if 1
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261 for (i=0; i<MINTAUDIO_freqcount; i++) {
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diff changeset
262 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
263 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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diff changeset
264 MINTAUDIO_frequencies[i].predivisor
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diff changeset
265 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
266 }
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diff changeset
267 #endif
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268
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diff changeset
269 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
270 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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271
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272 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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273 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
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diff changeset
274 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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275 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
276 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
277
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278 return 0;
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279 }
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diff changeset
280
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diff changeset
281 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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282 {
961
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diff changeset
283 int channels_mode, prediv, dmaclock;
644
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diff changeset
284 void *buffer;
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diff changeset
285
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diff changeset
286 /* Stop currently playing sound */
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diff changeset
287 Buffoper(0);
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diff changeset
288
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diff changeset
289 /* Set replay tracks */
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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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diff changeset
293 /* Select replay format */
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diff changeset
294 channels_mode=STEREO16;
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diff changeset
295 switch (spec->format & 0xff) {
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parents:
diff changeset
296 case 8:
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diff changeset
297 if (spec->channels==2) {
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diff changeset
298 channels_mode=STEREO8;
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299 } else {
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300 channels_mode=MONO8;
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301 }
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302 break;
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303 }
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304 if (Setmode(channels_mode)<0) {
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305 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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306 }
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307
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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308 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
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309 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
644
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310 switch(cookie_mcsn->play) {
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311 case MCSN_TT:
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312 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
961
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313 Soundcmd(SETPRESCALE, prediv);
644
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314 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
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315 break;
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316 case MCSN_FALCON:
961
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317 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
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318 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
644
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319 break;
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320 }
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321
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322 /* Set buffer */
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323 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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324 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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325 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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326 }
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327
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328 /* Install interrupt */
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329 Jdisint(MFP_DMASOUND);
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330 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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331 Jenabint(MFP_DMASOUND);
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diff changeset
332
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333 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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334 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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335 }
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336
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337 /* Go */
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338 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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339 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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340 }
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341
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342 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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343 {
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344 /* Lock sound system */
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345 if (Locksnd()!=1) {
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346 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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347 return(-1);
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348 }
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349
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350 SDL_MintAudio_device = this;
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351
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352 /* Check audio capabilities */
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353 if (Mint_CheckAudio(this, spec)==-1) {
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354 return -1;
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355 }
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356
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357 SDL_CalculateAudioSpec(spec);
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358
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359 /* Allocate memory for audio buffers in DMA-able RAM */
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360 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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diff changeset
361
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362 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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diff changeset
363 if (SDL_MintAudio_audiobuf[0]==NULL) {
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364 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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365 return (-1);
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366 }
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367 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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diff changeset
368 SDL_MintAudio_numbuf=0;
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369 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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370 SDL_MintAudio_audiosize = spec->size;
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diff changeset
371 SDL_MintAudio_mutex = 0;
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diff changeset
372
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373 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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374 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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diff changeset
375
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diff changeset
376 /* Setup audio hardware */
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377 Mint_InitAudio(this, spec);
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378
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379 return(1); /* We don't use threaded audio */
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380 }