Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 1621:f12379c41042

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Fixes bug #195: The proper name of Apple's operating system is "Mac OS X" not "MacOS X", as can bee seen in many places, for example http://www.apple.com/macosx/). This contrasts the naming of the old operating system, which was called "MacOS" and today is often refered to as "MacOS Classic". The attached patches fixes the misuse of the name "MacOS X" in both the SDL12 and sdlweb CVS modules.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 13:08:26 +0000
parents a8181c4040b8
children 782fd950bd46 c121d94672cb 405a192b68e7
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 #include "SDL_config.h"
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23
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24 /*
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25 MiNT audio driver
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26 using DMA 8bits (hardware access)
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27
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28 Patrice Mandin
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29 */
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30
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31 /* Mint includes */
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32 #include <mint/osbind.h>
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33 #include <mint/falcon.h>
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34 #include <mint/cookie.h>
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35
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36 #include "SDL_audio.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_sysaudio.h"
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39
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40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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41
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42 #include "SDL_mintaudio.h"
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43 #include "SDL_mintaudio_dma8.h"
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44
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45 /*--- Defines ---*/
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46
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47 #define MINT_AUDIO_DRIVER_NAME "mint_dma8"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:dma8: "
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51 #if 0
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52 #define DEBUG_PRINT(what) \
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53 { \
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54 printf what; \
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55 }
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56 #else
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57 #define DEBUG_PRINT(what)
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58 #endif
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59
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60 /*--- Static variables ---*/
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61
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62 static unsigned long cookie_snd, cookie_mch;
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63
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64 /*--- Audio driver functions ---*/
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65
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66 static void Mint_CloseAudio(_THIS);
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67 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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68 static void Mint_LockAudio(_THIS);
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69 static void Mint_UnlockAudio(_THIS);
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70
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71 /* To check/init hardware audio */
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72 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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73 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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74
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75 /*--- Audio driver bootstrap functions ---*/
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76
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77 static int Audio_Available(void)
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78 {
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79 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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80
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81 /* Check if user asked a different audio driver */
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82 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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83 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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84 return 0;
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85 }
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86
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87 /* Cookie _MCH present ? if not, assume ST machine */
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88 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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89 cookie_mch = MCH_ST;
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90 }
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91
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92 /* Cookie _SND present ? if not, assume ST machine */
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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94 cookie_snd = SND_PSG;
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95 }
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96
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97 /* Check if we have 8 bits audio */
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98 if ((cookie_snd & SND_8BIT)==0) {
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99 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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100 return(0);
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101 }
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102
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103 /* Check if audio is lockable */
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104 if (cookie_snd & SND_16BIT) {
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105 if (Locksnd()!=1) {
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106 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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107 return(0);
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108 }
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109
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110 Unlocksnd();
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111 }
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112
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113 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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114 return(1);
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115 }
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116
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117 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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118 {
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119 SDL_free(device->hidden);
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120 SDL_free(device);
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121 }
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122
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123 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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124 {
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125 SDL_AudioDevice *this;
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126
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127 /* Initialize all variables that we clean on shutdown */
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128 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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129 if ( this ) {
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130 SDL_memset(this, 0, (sizeof *this));
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131 this->hidden = (struct SDL_PrivateAudioData *)
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132 SDL_malloc((sizeof *this->hidden));
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133 }
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134 if ( (this == NULL) || (this->hidden == NULL) ) {
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135 SDL_OutOfMemory();
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136 if ( this ) {
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137 SDL_free(this);
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138 }
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139 return(0);
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140 }
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141 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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142
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143 /* Set the function pointers */
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144 this->OpenAudio = Mint_OpenAudio;
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145 this->CloseAudio = Mint_CloseAudio;
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146 this->LockAudio = Mint_LockAudio;
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diff changeset
147 this->UnlockAudio = Mint_UnlockAudio;
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148 this->free = Audio_DeleteDevice;
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149
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150 return this;
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151 }
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152
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153 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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154 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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155 Audio_Available, Audio_CreateDevice
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156 };
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157
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158 static void Mint_LockAudio(_THIS)
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159 {
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160 void *oldpile;
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161
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162 /* Stop replay */
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163 oldpile=(void *)Super(0);
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164 DMAAUDIO_IO.control=0;
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165 Super(oldpile);
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166 }
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167
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168 static void Mint_UnlockAudio(_THIS)
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169 {
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170 void *oldpile;
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171
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172 /* Restart replay */
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173 oldpile=(void *)Super(0);
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174 DMAAUDIO_IO.control=3;
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175 Super(oldpile);
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176 }
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177
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178 static void Mint_CloseAudio(_THIS)
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179 {
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180 void *oldpile;
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181
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182 /* Stop replay */
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183 oldpile=(void *)Super(0);
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184 DMAAUDIO_IO.control=0;
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185 Super(oldpile);
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186
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187 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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188
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189 /* Disable interrupt */
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190 Jdisint(MFP_DMASOUND);
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191
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192 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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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 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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199
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200 /* Clear buffers */
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201 if (SDL_MintAudio_audiobuf[0]) {
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202 Mfree(SDL_MintAudio_audiobuf[0]);
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203 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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204 }
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205
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206 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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207 }
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208
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209 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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210 {
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211 int i, masterprediv, sfreq;
644
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212 unsigned long masterclock;
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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)));
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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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220 /* Check formats available */
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221 spec->format = AUDIO_S8;
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222
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223 /* Calculate and select the closest frequency */
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224 sfreq=0;
644
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225 masterclock=MASTERCLOCK_STE;
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226 masterprediv=MASTERPREDIV_STE;
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227 switch(cookie_mch>>16) {
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228 /*
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229 case MCH_STE:
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230 masterclock=MASTERCLOCK_STE;
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231 masterprediv=MASTERPREDIV_STE;
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232 break;
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233 */
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234 case MCH_TT:
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235 masterclock=MASTERCLOCK_TT;
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236 masterprediv=MASTERPREDIV_TT;
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237 break;
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diff changeset
238 case MCH_F30:
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2911ff0a32bb Set MFP interrupt at end of frame
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diff changeset
239 case MCH_ARANYM:
644
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240 masterclock=MASTERCLOCK_FALCON1;
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241 masterprediv=MASTERPREDIV_FALCON;
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242 sfreq=1;
644
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243 break;
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244 }
961
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245
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246 MINTAUDIO_freqcount=0;
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247 for (i=sfreq;i<4;i++) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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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, i-sfreq, -1);
644
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250 }
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251
961
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252 #if 1
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253 for (i=0; i<MINTAUDIO_freqcount; i++) {
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254 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
255 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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diff changeset
256 MINTAUDIO_frequencies[i].predivisor
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257 ));
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258 }
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259 #endif
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260
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261 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
262 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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263
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diff changeset
264 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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265 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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diff changeset
266 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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267 DEBUG_PRINT(("channels=%d, ", spec->channels));
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268 DEBUG_PRINT(("freq=%d\n", spec->freq));
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269
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270 return 0;
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271 }
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272
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273 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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274 {
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275 void *oldpile;
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276 unsigned long buffer;
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277 unsigned char mode;
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278
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279 /* Set replay tracks */
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diff changeset
280 if (cookie_snd & SND_16BIT) {
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diff changeset
281 Settracks(0,0);
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282 Setmontracks(0);
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diff changeset
283 }
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diff changeset
284
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285 oldpile=(void *)Super(0);
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286
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diff changeset
287 /* Stop currently playing sound */
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diff changeset
288 DMAAUDIO_IO.control=0;
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289
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diff changeset
290 /* Set buffer */
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291 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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292 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
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293 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
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diff changeset
294 DMAAUDIO_IO.start_low = buffer & 255;
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diff changeset
295
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296 buffer += SDL_MintAudio_audiosize;
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297 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
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298 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
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299 DMAAUDIO_IO.end_low = buffer & 255;
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300
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301 mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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302 if (spec->channels==1) {
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303 mode |= 1<<7;
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304 }
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305 DMAAUDIO_IO.sound_ctrl = mode;
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306
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307 /* Set interrupt */
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308 Jdisint(MFP_DMASOUND);
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309 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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310 Jenabint(MFP_DMASOUND);
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311
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312 if (cookie_snd & SND_16BIT) {
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313 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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314 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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315 }
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316 }
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317
644
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318 /* Go */
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319 DMAAUDIO_IO.control = 3; /* playback + repeat */
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320
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321 Super(oldpile);
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322 }
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323
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324 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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325 {
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326 SDL_MintAudio_device = this;
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327
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328 /* Check audio capabilities */
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329 if (Mint_CheckAudio(this, spec)==-1) {
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330 return -1;
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331 }
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332
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333 SDL_CalculateAudioSpec(spec);
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334
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335 /* Allocate memory for audio buffers in DMA-able RAM */
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336 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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337
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338 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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339 if (SDL_MintAudio_audiobuf[0]==NULL) {
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340 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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341 return (-1);
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342 }
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343 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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344 SDL_MintAudio_numbuf=0;
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parents: 1107
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345 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
644
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346 SDL_MintAudio_audiosize = spec->size;
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347 SDL_MintAudio_mutex = 0;
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348
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349 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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350 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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351
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352 /* Setup audio hardware */
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353 Mint_InitAudio(this, spec);
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354
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355 return(1); /* We don't use threaded audio */
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356 }