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annotate src/audio/mint/SDL_mintaudio_gsxb.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 856f76a099c7
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 (GSXB 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_gsxb.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_gsxb"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:gsxb: "
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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_gsxb;
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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 /* GSXB callbacks */
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81 static void Mint_GsxbInterrupt(void);
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82 static void Mint_GsxbNullInterrupt(void);
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83
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84 /*--- Audio driver bootstrap functions ---*/
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85
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86 static int Audio_Available(void)
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87 {
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88 const char *envr = getenv("SDL_AUDIODRIVER");
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89
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90 /* Check if user asked a different audio driver */
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91 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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92 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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93 return(0);
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94 }
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95
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96 /* Cookie _SND present ? if not, assume ST machine */
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97 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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98 cookie_snd = SND_PSG;
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99 }
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100
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101 /* Check if we have 16 bits audio */
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102 if ((cookie_snd & SND_16BIT)==0) {
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103 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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104 return(0);
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105 }
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106
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107 /* Cookie GSXB present ? */
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108 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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109
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110 /* Is it GSXB ? */
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111 if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) {
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112 DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
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113 return(0);
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114 }
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115
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116 /* Check if audio is lockable */
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117 if (Locksnd()!=1) {
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118 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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119 return(0);
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120 }
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121
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122 Unlocksnd();
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123
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124 DEBUG_PRINT((DEBUG_NAME "GSXB 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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diff changeset
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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diff changeset
162 }
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163
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diff changeset
164 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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165 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
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diff changeset
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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diff changeset
171 /* Stop replay */
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172 Buffoper(0);
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173 }
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174
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diff changeset
175 static void Mint_UnlockAudio(_THIS)
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176 {
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diff changeset
177 /* Restart replay */
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diff changeset
178 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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179 }
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diff changeset
180
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diff changeset
181 static void Mint_CloseAudio(_THIS)
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182 {
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183 /* Stop replay */
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184 Buffoper(0);
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185
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diff changeset
186 /* Uninstall interrupt */
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c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
187 if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt)<0) {
644
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188 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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189 }
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190
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diff changeset
191 /* Wait if currently playing sound */
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192 while (SDL_MintAudio_mutex != 0) {
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193 }
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194
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195 /* Clear buffers */
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196 if (SDL_MintAudio_audiobuf[0]) {
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197 Mfree(SDL_MintAudio_audiobuf[0]);
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diff changeset
198 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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199 }
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diff changeset
200
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diff changeset
201 /* Unlock sound system */
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diff changeset
202 Unlocksnd();
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203 }
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204
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205 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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206 {
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diff changeset
207 long snd_format;
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diff changeset
208 int i, resolution, format_signed, format_bigendian;
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209
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210 resolution = spec->format & 0x00ff;
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211 format_signed = ((spec->format & 0x8000)!=0);
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diff changeset
212 format_bigendian = ((spec->format & 0x1000)!=0);
704
c4803992e09c Small bugfixes
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diff changeset
213
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214 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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215 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
c4803992e09c Small bugfixes
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216 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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217 DEBUG_PRINT(("channels=%d, ", spec->channels));
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218 DEBUG_PRINT(("freq=%d\n", spec->freq));
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219
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diff changeset
220 /* Check formats available */
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diff changeset
221 snd_format = Sndstatus(SND_QUERYFORMATS);
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diff changeset
222 switch (resolution) {
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diff changeset
223 case 8:
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diff changeset
224 if ((snd_format & SND_FORMAT8)==0) {
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diff changeset
225 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported");
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226 return -1;
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diff changeset
227 }
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diff changeset
228 snd_format = Sndstatus(SND_QUERY8BIT);
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diff changeset
229 break;
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diff changeset
230 case 16:
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diff changeset
231 if ((snd_format & SND_FORMAT16)==0) {
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diff changeset
232 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported");
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diff changeset
233 return -1;
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diff changeset
234 }
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diff changeset
235 snd_format = Sndstatus(SND_QUERY16BIT);
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diff changeset
236 break;
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diff changeset
237 default:
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diff changeset
238 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution");
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diff changeset
239 return -1;
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parents:
diff changeset
240 break;
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parents:
diff changeset
241 }
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diff changeset
242
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parents:
diff changeset
243 /* Check signed/unsigned format */
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diff changeset
244 if (format_signed) {
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diff changeset
245 if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
246 /* Ok */
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parents:
diff changeset
247 } else if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
248 /* Give unsigned format */
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diff changeset
249 spec->format = spec->format & (~0x8000);
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diff changeset
250 }
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diff changeset
251 } else {
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parents:
diff changeset
252 if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
253 /* Ok */
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parents:
diff changeset
254 } else if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
255 /* Give signed format */
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diff changeset
256 spec->format |= 0x8000;
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diff changeset
257 }
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diff changeset
258 }
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parents:
diff changeset
259
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diff changeset
260 if (format_bigendian) {
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parents:
diff changeset
261 if (snd_format & SND_FORMATBIGENDIAN) {
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parents:
diff changeset
262 /* Ok */
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diff changeset
263 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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parents:
diff changeset
264 /* Give little endian format */
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diff changeset
265 spec->format = spec->format & (~0x1000);
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diff changeset
266 }
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diff changeset
267 } else {
704
c4803992e09c Small bugfixes
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diff changeset
268 if (snd_format & SND_FORMATLITTLEENDIAN) {
644
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diff changeset
269 /* Ok */
704
c4803992e09c Small bugfixes
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diff changeset
270 } else if (snd_format & SND_FORMATBIGENDIAN) {
644
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diff changeset
271 /* Give big endian format */
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diff changeset
272 spec->format |= 0x1000;
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diff changeset
273 }
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diff changeset
274 }
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diff changeset
275
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diff changeset
276 /* Calculate and select the closest frequency */
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
277 MINTAUDIO_freqcount=0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
278 for (i=1;i<4;i++) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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parents: 1097
diff changeset
279 SDL_MintAudio_AddFrequency(this,
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
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diff changeset
280 MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K,
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1097
diff changeset
281 (1<<i)-1, -1);
644
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
282 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
283
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
284 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
285 for (i=0; i<MINTAUDIO_freqcount; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
286 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
287 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
288 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
289 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
290 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
291 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
292
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
293 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
294 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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parents:
diff changeset
295
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
296 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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parents:
diff changeset
297 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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298 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
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299 DEBUG_PRINT(("channels=%d, ", spec->channels));
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300 DEBUG_PRINT(("freq=%d\n", spec->freq));
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301
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302 return 0;
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303 }
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304
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305 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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306 {
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307 int channels_mode, prediv;
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308 void *buffer;
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309
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310 /* Stop currently playing sound */
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311 Buffoper(0);
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312
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313 /* Set replay tracks */
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314 Settracks(0,0);
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315 Setmontracks(0);
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316
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317 /* Select replay format */
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318 switch (spec->format & 0xff) {
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319 case 8:
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320 if (spec->channels==2) {
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321 channels_mode=STEREO8;
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322 } else {
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323 channels_mode=MONO8;
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324 }
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325 break;
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326 case 16:
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327 if (spec->channels==2) {
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328 channels_mode=STEREO16;
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329 } else {
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330 channels_mode=MONO16;
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331 }
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332 break;
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333 default:
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334 channels_mode=STEREO16;
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335 break;
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336 }
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337 if (Setmode(channels_mode)<0) {
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338 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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339 }
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340
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341 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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342 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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343
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344 /* Set buffer */
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345 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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346 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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347 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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348 }
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349
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350 /* Install interrupt */
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351 if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt)<0) {
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352 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
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353 }
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354
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355 /* Go */
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356 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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357 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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358 }
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359
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360 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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361 {
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362 /* Lock sound system */
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363 if (Locksnd()!=1) {
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364 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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365 return(-1);
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366 }
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367
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368 SDL_MintAudio_device = this;
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369
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370 /* Check audio capabilities */
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371 if (Mint_CheckAudio(this, spec)==-1) {
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372 return -1;
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373 }
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374
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375 SDL_CalculateAudioSpec(spec);
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376
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377 /* Allocate memory for audio buffers in DMA-able RAM */
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378 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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379
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380 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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381 if (SDL_MintAudio_audiobuf[0]==NULL) {
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382 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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383 return (-1);
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384 }
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385 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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386 SDL_MintAudio_numbuf=0;
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387 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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388 SDL_MintAudio_audiosize = spec->size;
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389 SDL_MintAudio_mutex = 0;
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390
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391 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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392 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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393
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394 /* Setup audio hardware */
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395 Mint_InitAudio(this, spec);
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396
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397 return(1); /* We don't use threaded audio */
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398 }
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399
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400 static void Mint_GsxbInterrupt(void)
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401 {
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402 Uint8 *newbuf;
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403
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404 if (SDL_MintAudio_mutex)
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405 return;
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406
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407 SDL_MintAudio_mutex=1;
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408
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409 SDL_MintAudio_numbuf ^= 1;
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410 SDL_MintAudio_Callback();
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411 newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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412 Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
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413
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414 SDL_MintAudio_mutex=0;
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415 }
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416
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417 static void Mint_GsxbNullInterrupt(void)
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418 {
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419 }