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annotate src/audio/mint/SDL_mintaudio_mcsn.c @ 1199:2d6dc7de1145

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From: Mike Frysinger <vapier@gentoo.org> To: sdl@libsdl.org Date: Sun, 11 Dec 2005 22:57:37 -0500 Subject: [SDL] exec stack in libsdl update i posted back in September a patch to remove executable stacks: http://www.devolution.com/pipermail/sdl/2005-September/070626.html later in November, a similar patch was merged it seems: http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm however, this lacks the additional output format checks that i posted in my patch ... this isnt a problem if the hermes asm code is only ever used to produce ELF objects, but if this is not true, then the additional checks in my original patch will need to be merged -mike
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 12 Dec 2005 09:13:12 +0000
parents 12c49532be00
children 3692456e7b0f
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 #include <support.h>
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34
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35 /* Mint includes */
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36 #include <mint/osbind.h>
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37 #include <mint/falcon.h>
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38 #include <mint/cookie.h>
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39
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40 #include "SDL_endian.h"
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41 #include "SDL_audio.h"
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42 #include "SDL_audio_c.h"
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43 #include "SDL_audiomem.h"
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44 #include "SDL_sysaudio.h"
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45
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46 #include "SDL_atarimxalloc_c.h"
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47
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48 #include "SDL_mintaudio.h"
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49 #include "SDL_mintaudio_mcsn.h"
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50
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51 /*--- Defines ---*/
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52
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53 #define MINT_AUDIO_DRIVER_NAME "mint_mcsn"
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54
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55 /* Debug print info */
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56 #define DEBUG_NAME "audio:mcsn: "
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57 #if 0
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58 #define DEBUG_PRINT(what) \
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59 { \
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60 printf what; \
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61 }
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62 #else
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63 #define DEBUG_PRINT(what)
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64 #endif
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65
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66 /*--- Static variables ---*/
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67
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68 static unsigned long cookie_snd, cookie_mch;
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69 static cookie_mcsn_t *cookie_mcsn;
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70
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71 /*--- Audio driver functions ---*/
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72
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73 static void Mint_CloseAudio(_THIS);
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74 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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75 static void Mint_LockAudio(_THIS);
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76 static void Mint_UnlockAudio(_THIS);
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77
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78 /* To check/init hardware audio */
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79 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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80 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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81
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82 /*--- Audio driver bootstrap functions ---*/
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83
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84 static int Audio_Available(void)
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85 {
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86 unsigned long dummy;
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87 const char *envr = getenv("SDL_AUDIODRIVER");
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88
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89 SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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90
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91 /* We can't use XBIOS in interrupt with Magic, don't know about thread */
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92 if (Getcookie(C_MagX, &dummy) == C_FOUND) {
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93 return(0);
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94 }
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95
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96 /* Check if user asked a different audio driver */
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97 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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98 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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99 return(0);
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100 }
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101
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102 /* Cookie _MCH present ? if not, assume ST machine */
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103 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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104 cookie_mch = MCH_ST;
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105 }
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106
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107 /* Cookie _SND present ? if not, assume ST machine */
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108 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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109 cookie_snd = SND_PSG;
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110 }
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111
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112 /* Check if we have 16 bits audio */
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113 if ((cookie_snd & SND_16BIT)==0) {
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114 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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115 return(0);
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116 }
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117
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118 /* Cookie MCSN present ? */
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119 if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
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120 DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
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121 return(0);
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122 }
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123
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124 /* Check if interrupt at end of replay */
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125 if (cookie_mcsn->pint == 0) {
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126 DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
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127 return(0);
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128 }
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129
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130 /* Check if audio is lockable */
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131 if (Locksnd()!=1) {
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132 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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133 return(0);
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134 }
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135
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136 Unlocksnd();
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137
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138 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
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139 return(1);
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140 }
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141
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142 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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143 {
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144 free(device->hidden);
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145 free(device);
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146 }
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147
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148 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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149 {
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diff changeset
150 SDL_AudioDevice *this;
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151
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152 /* Initialize all variables that we clean on shutdown */
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153 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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154 if ( this ) {
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155 memset(this, 0, (sizeof *this));
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156 this->hidden = (struct SDL_PrivateAudioData *)
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157 malloc((sizeof *this->hidden));
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158 }
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diff changeset
159 if ( (this == NULL) || (this->hidden == NULL) ) {
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160 SDL_OutOfMemory();
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161 if ( this ) {
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162 free(this);
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163 }
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164 return(0);
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165 }
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diff changeset
166 memset(this->hidden, 0, (sizeof *this->hidden));
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167
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168 /* Set the function pointers */
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169 this->OpenAudio = Mint_OpenAudio;
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170 this->CloseAudio = Mint_CloseAudio;
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171 this->LockAudio = Mint_LockAudio;
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172 this->UnlockAudio = Mint_UnlockAudio;
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173 this->free = Audio_DeleteDevice;
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174
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175 return this;
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176 }
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177
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178 AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
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179 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
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180 Audio_Available, Audio_CreateDevice
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181 };
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182
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183 static void Mint_LockAudio(_THIS)
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184 {
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185 /* Stop replay */
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186 Buffoper(0);
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187 }
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188
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189 static void Mint_UnlockAudio(_THIS)
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190 {
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diff changeset
191 /* Restart replay */
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192 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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193 }
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194
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195 static void Mint_CloseAudio(_THIS)
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196 {
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197 /* Stop replay */
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
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198 SDL_MintAudio_WaitThread();
644
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199 Buffoper(0);
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200
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
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diff changeset
201 if (!SDL_MintAudio_mint_present) {
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
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202 /* Uninstall interrupt */
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203 Jdisint(MFP_DMASOUND);
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
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diff changeset
204 }
644
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205
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206 /* Wait if currently playing sound */
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207 while (SDL_MintAudio_mutex != 0) {
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208 }
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209
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diff changeset
210 /* Clear buffers */
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diff changeset
211 if (SDL_MintAudio_audiobuf[0]) {
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diff changeset
212 Mfree(SDL_MintAudio_audiobuf[0]);
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diff changeset
213 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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214 }
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215
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diff changeset
216 /* Unlock sound system */
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diff changeset
217 Unlocksnd();
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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 {
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222 int i;
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223 unsigned long masterclock, masterprediv;
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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)));
704
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diff changeset
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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diff changeset
231 /* Check formats available */
961
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232 MINTAUDIO_freqcount=0;
644
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diff changeset
233 switch(cookie_mcsn->play) {
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diff changeset
234 case MCSN_ST:
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235 spec->channels=1;
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diff changeset
236 spec->format=8; /* FIXME: is it signed or unsigned ? */
1107
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diff changeset
237 SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
644
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diff changeset
238 break;
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diff changeset
239 case MCSN_TT: /* Also STE, Mega STE */
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diff changeset
240 spec->format=AUDIO_S8;
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diff changeset
241 masterclock=MASTERCLOCK_STE;
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diff changeset
242 masterprediv=MASTERPREDIV_STE;
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diff changeset
243 if ((cookie_mch>>16)==MCH_TT) {
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diff changeset
244 masterclock=MASTERCLOCK_TT;
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245 masterprediv=MASTERPREDIV_TT;
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diff changeset
246 }
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
247 for (i=0; i<4; i++) {
1107
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diff changeset
248 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
249 masterclock, 3-i, -1);
644
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diff changeset
250 }
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diff changeset
251 break;
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diff changeset
252 case MCSN_FALCON: /* Also Mac */
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
253 for (i=1; i<12; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
254 /* Remove unusable Falcon codec predivisors */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
255 if ((i==6) || (i==8) || (i==10)) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
256 continue;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
257 }
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
258 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)),
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diff changeset
259 CLK25M, i+1, -1);
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
260 }
644
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diff changeset
261 if (cookie_mcsn->res1 != 0) {
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
262 for (i=1; i<4; i++) {
1107
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diff changeset
263 SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)),
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
264 CLKEXT, (1<<i)-1, -1);
961
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diff changeset
265 }
644
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diff changeset
266 }
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diff changeset
267 spec->format |= 0x8000; /* Audio is always signed */
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diff changeset
268 if ((spec->format & 0x00ff)==16) {
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diff changeset
269 spec->format |= 0x1000; /* Audio is always big endian */
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diff changeset
270 spec->channels=2; /* 16 bits always stereo */
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diff changeset
271 }
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parents:
diff changeset
272 break;
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parents:
diff changeset
273 }
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parents:
diff changeset
274
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
275 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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276 for (i=0; i<MINTAUDIO_freqcount; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
277 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
278 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
279 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
280 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
281 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
282 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
283
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
284 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
285 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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parents:
diff changeset
286
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diff changeset
287 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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parents:
diff changeset
288 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
289 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
290 DEBUG_PRINT(("channels=%d, ", spec->channels));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
291 DEBUG_PRINT(("freq=%d\n", spec->freq));
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292
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293 return 0;
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294 }
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295
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296 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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297 {
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298 int channels_mode, prediv, dmaclock;
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299 void *buffer;
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300
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301 /* Stop currently playing sound */
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302 SDL_MintAudio_quit_thread = SDL_FALSE;
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303 SDL_MintAudio_thread_finished = SDL_TRUE;
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304 SDL_MintAudio_WaitThread();
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305 Buffoper(0);
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306
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307 /* Set replay tracks */
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308 Settracks(0,0);
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309 Setmontracks(0);
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310
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311 /* Select replay format */
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312 channels_mode=STEREO16;
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313 switch (spec->format & 0xff) {
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314 case 8:
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315 if (spec->channels==2) {
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316 channels_mode=STEREO8;
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317 } else {
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318 channels_mode=MONO8;
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319 }
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320 break;
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321 }
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322 if (Setmode(channels_mode)<0) {
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323 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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324 }
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325
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326 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
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327 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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328 switch(cookie_mcsn->play) {
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329 case MCSN_TT:
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330 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
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331 Soundcmd(SETPRESCALE, prediv);
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332 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
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333 break;
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334 case MCSN_FALCON:
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335 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
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336 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
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337 break;
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338 }
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339
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340 /* Set buffer */
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341 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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342 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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343 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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344 }
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345
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346 if (SDL_MintAudio_mint_present) {
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347 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
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348 } else {
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349 /* Install interrupt */
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350 Jdisint(MFP_DMASOUND);
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351 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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352 Jenabint(MFP_DMASOUND);
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353
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354 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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355 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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356 }
644
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357 }
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358
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359 /* Go */
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360 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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361 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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362 }
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363
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364 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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365 {
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366 /* Lock sound system */
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367 if (Locksnd()!=1) {
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368 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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369 return(-1);
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370 }
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371
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372 SDL_MintAudio_device = this;
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373
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374 /* Check audio capabilities */
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375 if (Mint_CheckAudio(this, spec)==-1) {
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376 return -1;
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377 }
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378
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379 SDL_CalculateAudioSpec(spec);
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380
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381 /* Allocate memory for audio buffers in DMA-able RAM */
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382 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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383
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384 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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385 if (SDL_MintAudio_audiobuf[0]==NULL) {
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386 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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387 return (-1);
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388 }
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389 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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390 SDL_MintAudio_numbuf=0;
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391 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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392 SDL_MintAudio_audiosize = spec->size;
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393 SDL_MintAudio_mutex = 0;
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394
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395 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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396 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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397
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398 /* Setup audio hardware */
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399 Mint_InitAudio(this, spec);
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400
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401 return(1); /* We don't use SDL threaded audio */
644
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402 }