Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_stfa.c @ 1627:aee7ea396f59

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Fixed bug #179 SDL_SemValue() always returns 0. That's because the underlying POSIX sem_getvalue() is implemented as a noop in Mac OS X. Apart from that, semaphores do work properly (at least according to test/testsem), so I'm not sure if this is worth fixing at all.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 14:04:13 +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 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);
644
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212 }
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213
961
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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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diff changeset
217 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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diff changeset
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;
644
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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 }
704
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diff changeset
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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diff changeset
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);
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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 }