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annotate src/audio/mint/SDL_mintaudio_stfa.c @ 1395:4eb8c66ce282

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Hum badly edited source
author Patrice Mandin <patmandin@gmail.com>
date Mon, 20 Feb 2006 20:53:01 +0000
parents 19418e4422cb
children d910939febfa
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
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23 /*
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24 MiNT audio driver
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25 using XBIOS functions (STFA 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 /* Mint includes */
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31 #include <mint/osbind.h>
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32 #include <mint/falcon.h>
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33 #include <mint/cookie.h>
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34
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35 #include "SDL_audio.h"
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36 #include "../SDL_audio_c.h"
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37 #include "../SDL_sysaudio.h"
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38
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39 #include "SDL_atarimxalloc_c.h"
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40
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41 #include "SDL_mintaudio.h"
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42 #include "SDL_mintaudio_stfa.h"
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43
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44 /*--- Defines ---*/
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45
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46 #define MINT_AUDIO_DRIVER_NAME "mint_stfa"
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47
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48 /* Debug print info */
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49 #define DEBUG_NAME "audio:stfa: "
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50 #if 0
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51 #define DEBUG_PRINT(what) \
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52 { \
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53 printf what; \
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54 }
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55 #else
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56 #define DEBUG_PRINT(what)
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57 #endif
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58
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59 /*--- Static variables ---*/
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60
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61 static unsigned long cookie_snd, cookie_mch;
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62 static cookie_stfa_t *cookie_stfa;
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63
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64 static const int freqs[16]={
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65 4995, 6269, 7493, 8192,
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66 9830, 10971, 12538, 14985,
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67 16384, 19819, 21943, 24576,
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68 30720, 32336, 43885, 49152
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69 };
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70
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71 /*--- Audio driver functions ---*/
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72
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73 static void Mint_CloseAudio(_THIS);
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74 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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75 static void Mint_LockAudio(_THIS);
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76 static void Mint_UnlockAudio(_THIS);
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77
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78 /* To check/init hardware audio */
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79 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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80 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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81
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82 /*--- Audio driver bootstrap functions ---*/
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83
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84 static int Audio_Available(void)
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85 {
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86 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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87
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88 /* Check if user asked a different audio driver */
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89 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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90 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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91 return(0);
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92 }
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93
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94 /* Cookie _MCH present ? if not, assume ST machine */
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95 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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96 cookie_mch = MCH_ST;
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97 }
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98
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99 /* Cookie _SND present ? if not, assume ST machine */
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100 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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101 cookie_snd = SND_PSG;
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102 }
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103
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104 /* Cookie STFA present ? */
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105 if (Getcookie(C_STFA, (long *) &cookie_stfa) != C_FOUND) {
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106 DEBUG_PRINT((DEBUG_NAME "no STFA audio\n"));
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107 return(0);
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108 }
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109
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110 SDL_MintAudio_stfa = cookie_stfa;
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111
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112 DEBUG_PRINT((DEBUG_NAME "STFA audio available!\n"));
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113 return(1);
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114 }
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115
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116 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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117 {
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118 SDL_free(device->hidden);
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119 SDL_free(device);
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120 }
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121
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122 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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123 {
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124 SDL_AudioDevice *this;
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125
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126 /* Initialize all variables that we clean on shutdown */
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127 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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128 if ( this ) {
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129 SDL_memset(this, 0, (sizeof *this));
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130 this->hidden = (struct SDL_PrivateAudioData *)
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131 SDL_malloc((sizeof *this->hidden));
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132 }
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133 if ( (this == NULL) || (this->hidden == NULL) ) {
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134 SDL_OutOfMemory();
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135 if ( this ) {
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136 SDL_free(this);
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137 }
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138 return(0);
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139 }
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140 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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141
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142 /* Set the function pointers */
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143 this->OpenAudio = Mint_OpenAudio;
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144 this->CloseAudio = Mint_CloseAudio;
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145 this->LockAudio = Mint_LockAudio;
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146 this->UnlockAudio = Mint_UnlockAudio;
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147 this->free = Audio_DeleteDevice;
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148
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149 return this;
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150 }
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151
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152 AudioBootStrap MINTAUDIO_STFA_bootstrap = {
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153 MINT_AUDIO_DRIVER_NAME, "MiNT STFA audio driver",
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154 Audio_Available, Audio_CreateDevice
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155 };
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156
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157 static void Mint_LockAudio(_THIS)
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158 {
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159 void *oldpile;
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160
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161 /* Stop replay */
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162 oldpile=(void *)Super(0);
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163 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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164 Super(oldpile);
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165 }
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166
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167 static void Mint_UnlockAudio(_THIS)
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168 {
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169 void *oldpile;
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170
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171 /* Restart replay */
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172 oldpile=(void *)Super(0);
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173 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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174 Super(oldpile);
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175 }
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176
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177 static void Mint_CloseAudio(_THIS)
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178 {
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179 void *oldpile;
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180
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181 /* Stop replay */
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182 oldpile=(void *)Super(0);
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183 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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184 Super(oldpile);
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185
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186 /* Wait if currently playing sound */
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187 while (SDL_MintAudio_mutex != 0) {
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188 }
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189
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190 /* Clear buffers */
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191 if (SDL_MintAudio_audiobuf[0]) {
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192 Mfree(SDL_MintAudio_audiobuf[0]);
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193 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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194 }
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195 }
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196
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197 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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198 {
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199 int i;
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200
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201 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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202 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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203 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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204 DEBUG_PRINT(("channels=%d, ", spec->channels));
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205 DEBUG_PRINT(("freq=%d\n", spec->freq));
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206
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207 /* Check formats available */
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208 MINTAUDIO_freqcount=0;
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209 for (i=0;i<16;i++) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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210 SDL_MintAudio_AddFrequency(this, freqs[i], 0, i, -1);
644
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211 }
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212
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213 #if 1
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214 for (i=0; i<MINTAUDIO_freqcount; i++) {
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215 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
216 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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217 MINTAUDIO_frequencies[i].predivisor
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218 ));
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219 }
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220 #endif
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221
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222 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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223 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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224
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225 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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226 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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227 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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228 DEBUG_PRINT(("channels=%d, ", spec->channels));
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229 DEBUG_PRINT(("freq=%d\n", spec->freq));
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230
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231 return 0;
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232 }
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233
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234 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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235 {
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236 void *buffer;
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237 void *oldpile;
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238
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239 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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240
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241 oldpile=(void *)Super(0);
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242
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243 /* Stop replay */
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244 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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245
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246 /* Select replay format */
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247 cookie_stfa->sound_control = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
644
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248 if ((spec->format & 0xff)==8) {
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249 cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
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250 } else {
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251 cookie_stfa->sound_control |= STFA_FORMAT_16BIT;
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252 }
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253 if (spec->channels==2) {
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254 cookie_stfa->sound_control |= STFA_FORMAT_STEREO;
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255 } else {
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256 cookie_stfa->sound_control |= STFA_FORMAT_MONO;
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257 }
704
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diff changeset
258 if ((spec->format & 0x8000)!=0) {
644
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259 cookie_stfa->sound_control |= STFA_FORMAT_SIGNED;
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260 } else {
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261 cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED;
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262 }
704
c4803992e09c Small bugfixes
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diff changeset
263 if ((spec->format & 0x1000)!=0) {
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diff changeset
264 cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN;
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diff changeset
265 } else {
644
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266 cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN;
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267 }
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268
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269 /* Set buffer */
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270 cookie_stfa->sound_start = (unsigned long) buffer;
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271 cookie_stfa->sound_end = (unsigned long) (buffer + spec->size);
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272
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273 /* Set interrupt */
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274 cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt;
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275
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276 /* Restart replay */
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277 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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278
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279 Super(oldpile);
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280
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281 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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282 }
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283
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284 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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285 {
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286 SDL_MintAudio_device = this;
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287
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288 /* Check audio capabilities */
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289 if (Mint_CheckAudio(this, spec)==-1) {
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290 return -1;
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291 }
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292
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293 SDL_CalculateAudioSpec(spec);
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294
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295 /* Allocate memory for audio buffers in DMA-able RAM */
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296 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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297
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298 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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299 if (SDL_MintAudio_audiobuf[0]==NULL) {
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300 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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301 return (-1);
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302 }
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303 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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304 SDL_MintAudio_numbuf=0;
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305 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
644
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306 SDL_MintAudio_audiosize = spec->size;
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307 SDL_MintAudio_mutex = 0;
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308
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309 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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310 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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311
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312 /* Setup audio hardware */
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313 Mint_InitAudio(this, spec);
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314
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315 return(1); /* We don't use threaded audio */
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316 }