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annotate src/audio/mint/SDL_mintaudio_stfa.c @ 1585:980d2a0dc2a3

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Date: Tue, 4 Mar 2003 15:05:31 -0800 From: "Jim" Subject: [SDL] Frame Buffer patches... Okay I'm new at patch generation - so please tell me if there's a better way I could have done this. Attached are two patch files generated with 'cvs diff -u' SDL-fb-open-lock.patch applies to SDL_fbvideo.c Modifies the open loop to check /dev/fb/0 found on devfs... Modifies the lock code to return failure if the current virtual terminal is not the one opened for frame buffer writing... Lock would hang forever if switched away (ctrl-alt-F1) ... SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c Switches default mouse mode based on SDL_MOUSEDRV - currently only accepts PS2 - otherwise default is MS Mouse. When the screen is switched - exisiting code (wrapped in ifdef SAVE_SCREEN_COTENTS) would save the wrong bit of the screen.... ( I run frame buffer 1600x1200, the size I requested was 800x600 - the save would save the top 800 lines (non biased) and restore them... Adding screen->offset fixed that ) However, if that option is not set, then a call to SDL_UpdateRect (full screen) is made. (which may have had it's contents changed since the screen is not entirely locked because of lock-failure patch) Jim [patches slightly tweaked for SDL 1.2.10]
author Sam Lantinga <slouken@libsdl.org>
date Wed, 22 Mar 2006 07:48:22 +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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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 XBIOS functions (STFA driver)
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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_stfa.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_stfa"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:stfa: "
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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 static cookie_stfa_t *cookie_stfa;
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64
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65 static const int freqs[16]={
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66 4995, 6269, 7493, 8192,
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67 9830, 10971, 12538, 14985,
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68 16384, 19819, 21943, 24576,
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69 30720, 32336, 43885, 49152
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70 };
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71
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72 /*--- Audio driver functions ---*/
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73
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74 static void Mint_CloseAudio(_THIS);
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75 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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76 static void Mint_LockAudio(_THIS);
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77 static void Mint_UnlockAudio(_THIS);
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78
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79 /* To check/init hardware audio */
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80 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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81 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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82
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83 /*--- Audio driver bootstrap functions ---*/
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84
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85 static int Audio_Available(void)
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86 {
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87 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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88
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89 /* Check if user asked a different audio driver */
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90 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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91 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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92 return(0);
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93 }
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94
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95 /* Cookie _MCH present ? if not, assume ST machine */
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96 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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97 cookie_mch = MCH_ST;
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98 }
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99
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100 /* Cookie _SND present ? if not, assume ST machine */
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101 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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102 cookie_snd = SND_PSG;
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103 }
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104
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105 /* Cookie STFA present ? */
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106 if (Getcookie(C_STFA, (long *) &cookie_stfa) != C_FOUND) {
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107 DEBUG_PRINT((DEBUG_NAME "no STFA audio\n"));
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108 return(0);
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109 }
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110
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111 SDL_MintAudio_stfa = cookie_stfa;
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112
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113 DEBUG_PRINT((DEBUG_NAME "STFA 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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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_STFA_bootstrap = {
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154 MINT_AUDIO_DRIVER_NAME, "MiNT STFA 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 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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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 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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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 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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185 Super(oldpile);
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186
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187 /* Wait if currently playing sound */
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188 while (SDL_MintAudio_mutex != 0) {
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189 }
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190
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191 /* Clear buffers */
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192 if (SDL_MintAudio_audiobuf[0]) {
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193 Mfree(SDL_MintAudio_audiobuf[0]);
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194 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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195 }
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196 }
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197
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198 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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199 {
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200 int i;
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201
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202 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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203 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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204 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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205 DEBUG_PRINT(("channels=%d, ", spec->channels));
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206 DEBUG_PRINT(("freq=%d\n", spec->freq));
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207
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208 /* Check formats available */
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209 MINTAUDIO_freqcount=0;
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210 for (i=0;i<16;i++) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
211 SDL_MintAudio_AddFrequency(this, freqs[i], 0, i, -1);
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212 }
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213
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214 #if 1
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215 for (i=0; i<MINTAUDIO_freqcount; i++) {
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216 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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217 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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218 MINTAUDIO_frequencies[i].predivisor
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219 ));
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220 }
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221 #endif
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222
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223 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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224 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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225
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226 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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227 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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228 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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229 DEBUG_PRINT(("channels=%d, ", spec->channels));
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230 DEBUG_PRINT(("freq=%d\n", spec->freq));
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231
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232 return 0;
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233 }
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234
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235 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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236 {
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237 void *buffer;
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238 void *oldpile;
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239
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240 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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241
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242 oldpile=(void *)Super(0);
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243
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244 /* Stop replay */
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245 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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246
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247 /* Select replay format */
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248 cookie_stfa->sound_control = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
644
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249 if ((spec->format & 0xff)==8) {
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250 cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
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251 } else {
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252 cookie_stfa->sound_control |= STFA_FORMAT_16BIT;
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253 }
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254 if (spec->channels==2) {
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255 cookie_stfa->sound_control |= STFA_FORMAT_STEREO;
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256 } else {
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257 cookie_stfa->sound_control |= STFA_FORMAT_MONO;
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258 }
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259 if ((spec->format & 0x8000)!=0) {
644
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260 cookie_stfa->sound_control |= STFA_FORMAT_SIGNED;
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261 } else {
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262 cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED;
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263 }
704
c4803992e09c Small bugfixes
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diff changeset
264 if ((spec->format & 0x1000)!=0) {
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265 cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN;
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diff changeset
266 } else {
644
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267 cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN;
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268 }
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269
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270 /* Set buffer */
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271 cookie_stfa->sound_start = (unsigned long) buffer;
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272 cookie_stfa->sound_end = (unsigned long) (buffer + spec->size);
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273
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274 /* Set interrupt */
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275 cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt;
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276
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277 /* Restart replay */
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278 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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279
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280 Super(oldpile);
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281
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282 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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283 }
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284
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285 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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286 {
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287 SDL_MintAudio_device = this;
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288
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289 /* Check audio capabilities */
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290 if (Mint_CheckAudio(this, spec)==-1) {
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291 return -1;
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292 }
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293
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294 SDL_CalculateAudioSpec(spec);
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295
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296 /* Allocate memory for audio buffers in DMA-able RAM */
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297 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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298
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299 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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300 if (SDL_MintAudio_audiobuf[0]==NULL) {
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301 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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302 return (-1);
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303 }
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304 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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305 SDL_MintAudio_numbuf=0;
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306 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
644
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307 SDL_MintAudio_audiosize = spec->size;
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308 SDL_MintAudio_mutex = 0;
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309
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310 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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311 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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312
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313 /* Setup audio hardware */
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314 Mint_InitAudio(this, spec);
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315
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316 return(1); /* We don't use threaded audio */
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317 }