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annotate src/audio/mint/SDL_mintaudio_stfa.c @ 2005:45af7d69f8eb

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MiNT audio driver cleanups for clamping types and channels to supported values. int32 support now available in one instance.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 01 Sep 2006 06:32:54 +0000
parents c121d94672cb
children d48ead2d2ba5
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
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86 Audio_Available(void)
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87 {
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88 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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89
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90 /* Check if user asked a different audio driver */
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91 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME) != 0)) {
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92 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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93 return (0);
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94 }
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95
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96 /* Cookie _MCH present ? if not, assume ST machine */
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97 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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98 cookie_mch = MCH_ST;
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99 }
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100
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101 /* Cookie _SND present ? if not, assume ST machine */
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102 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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103 cookie_snd = SND_PSG;
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104 }
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105
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106 /* Cookie STFA present ? */
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107 if (Getcookie(C_STFA, (long *) &cookie_stfa) != C_FOUND) {
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108 DEBUG_PRINT((DEBUG_NAME "no STFA audio\n"));
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109 return (0);
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110 }
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111
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112 SDL_MintAudio_stfa = cookie_stfa;
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113
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114 DEBUG_PRINT((DEBUG_NAME "STFA audio available!\n"));
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115 return (1);
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116 }
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117
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118 static void
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119 Audio_DeleteDevice(SDL_AudioDevice * device)
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120 {
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121 SDL_free(device->hidden);
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122 SDL_free(device);
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123 }
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124
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125 static SDL_AudioDevice *
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126 Audio_CreateDevice(int devindex)
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127 {
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128 SDL_AudioDevice *this;
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129
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130 /* Initialize all variables that we clean on shutdown */
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131 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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132 if (this) {
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133 SDL_memset(this, 0, (sizeof *this));
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134 this->hidden = (struct SDL_PrivateAudioData *)
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135 SDL_malloc((sizeof *this->hidden));
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136 }
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137 if ((this == NULL) || (this->hidden == NULL)) {
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138 SDL_OutOfMemory();
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139 if (this) {
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140 SDL_free(this);
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141 }
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142 return (0);
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143 }
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144 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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145
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146 /* Set the function pointers */
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147 this->OpenAudio = Mint_OpenAudio;
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148 this->CloseAudio = Mint_CloseAudio;
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149 this->LockAudio = Mint_LockAudio;
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150 this->UnlockAudio = Mint_UnlockAudio;
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151 this->free = Audio_DeleteDevice;
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152
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153 return this;
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154 }
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155
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156 AudioBootStrap MINTAUDIO_STFA_bootstrap = {
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157 MINT_AUDIO_DRIVER_NAME, "MiNT STFA audio driver",
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158 Audio_Available, Audio_CreateDevice
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159 };
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160
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161 static void
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162 Mint_LockAudio(_THIS)
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163 {
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164 void *oldpile;
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165
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166 /* Stop replay */
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167 oldpile = (void *) Super(0);
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168 cookie_stfa->sound_enable = STFA_PLAY_DISABLE;
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169 Super(oldpile);
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170 }
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171
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172 static void
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173 Mint_UnlockAudio(_THIS)
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174 {
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175 void *oldpile;
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176
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177 /* Restart replay */
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178 oldpile = (void *) Super(0);
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179 cookie_stfa->sound_enable = STFA_PLAY_ENABLE | STFA_PLAY_REPEAT;
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180 Super(oldpile);
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181 }
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182
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183 static void
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184 Mint_CloseAudio(_THIS)
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185 {
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186 void *oldpile;
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187
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188 /* Stop replay */
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189 oldpile = (void *) Super(0);
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190 cookie_stfa->sound_enable = STFA_PLAY_DISABLE;
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191 Super(oldpile);
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192
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193 /* Wait if currently playing sound */
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194 while (SDL_MintAudio_mutex != 0) {
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195 }
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196
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197 /* Clear buffers */
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198 if (SDL_MintAudio_audiobuf[0]) {
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199 Mfree(SDL_MintAudio_audiobuf[0]);
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200 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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201 }
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202 }
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203
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204 static int
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205 Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
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206 {
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207 int i;
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208
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209 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", SDL_AUDIO_BITSIZE(spec->format)));
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210 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(spec->format)));
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211 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(spec->format)));
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212 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(spec->format)));
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213 DEBUG_PRINT(("channels=%d, ", spec->channels));
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214 DEBUG_PRINT(("freq=%d\n", spec->freq));
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215
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216 if (SDL_AUDIO_BITSIZE(spec->format) > 16) {
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217 spec->format = AUDIO_S16SYS; /* clamp out int32/float32 ... */
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218 }
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219
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220 if (spec->channels > 2) {
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221 spec->channels = 2; /* no more than stereo! */
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222 }
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223
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224 /* Check formats available */
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225 MINTAUDIO_freqcount = 0;
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226 for (i = 0; i < 16; i++) {
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227 SDL_MintAudio_AddFrequency(this, freqs[i], 0, i, -1);
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228 }
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229
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230 #if 1
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231 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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232 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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233 i, MINTAUDIO_frequencies[i].frequency,
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234 MINTAUDIO_frequencies[i].masterclock,
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235 MINTAUDIO_frequencies[i].predivisor));
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236 }
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237 #endif
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238
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239 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
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240 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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241
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242 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", SDL_AUDIO_BITSIZE(spec->format)));
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243 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(spec->format)));
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244 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(spec->format)));
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245 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(spec->format)));
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246 DEBUG_PRINT(("channels=%d, ", spec->channels));
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247 DEBUG_PRINT(("freq=%d\n", spec->freq));
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248
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249 return 0;
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250 }
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251
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252 static void
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253 Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
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254 {
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255 void *buffer;
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256 void *oldpile;
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257
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258 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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259
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260 oldpile = (void *) Super(0);
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261
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262 /* Stop replay */
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263 cookie_stfa->sound_enable = STFA_PLAY_DISABLE;
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264
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265 /* Select replay format */
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266 cookie_stfa->sound_control =
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267 MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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268 if (SDL_AUDIO_BITSIZE(spec->format) == 8) {
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269 cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
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270 } else {
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271 cookie_stfa->sound_control |= STFA_FORMAT_16BIT;
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272 }
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273 if (spec->channels == 2) {
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274 cookie_stfa->sound_control |= STFA_FORMAT_STEREO;
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275 } else {
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276 cookie_stfa->sound_control |= STFA_FORMAT_MONO;
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277 }
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278 if (SDL_AUDIO_ISSIGNED(spec->format) != 0) {
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279 cookie_stfa->sound_control |= STFA_FORMAT_SIGNED;
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280 } else {
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281 cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED;
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282 }
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283 if (SDL_AUDIO_ISBIGENDIAN(spec->format) != 0) {
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284 cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN;
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285 } else {
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286 cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN;
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287 }
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288
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289 /* Set buffer */
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290 cookie_stfa->sound_start = (unsigned long) buffer;
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291 cookie_stfa->sound_end = (unsigned long) (buffer + spec->size);
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292
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293 /* Set interrupt */
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294 cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt;
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295
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296 /* Restart replay */
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297 cookie_stfa->sound_enable = STFA_PLAY_ENABLE | STFA_PLAY_REPEAT;
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298
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299 Super(oldpile);
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300
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301 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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302 }
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303
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304 static int
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305 Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
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306 {
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307 SDL_MintAudio_device = this;
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308
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309 /* Check audio capabilities */
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310 if (Mint_CheckAudio(this, spec) == -1) {
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311 return -1;
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312 }
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313
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314 SDL_CalculateAudioSpec(spec);
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315
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316 /* Allocate memory for audio buffers in DMA-able RAM */
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317 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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318
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319 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size * 2, MX_STRAM);
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320 if (SDL_MintAudio_audiobuf[0] == NULL) {
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321 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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322 return (-1);
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323 }
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324 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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325 SDL_MintAudio_numbuf = 0;
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326 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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327 SDL_MintAudio_audiosize = spec->size;
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328 SDL_MintAudio_mutex = 0;
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329
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330 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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331 SDL_MintAudio_audiobuf[0]));
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332 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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333 SDL_MintAudio_audiobuf[1]));
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334
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335 /* Setup audio hardware */
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336 Mint_InitAudio(this, spec);
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337
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338 return (1); /* We don't use threaded audio */
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339 }
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340
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341 /* vi: set ts=4 sw=4 expandtab: */