Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 3848:4de14c915f4c SDL-1.2

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Updated the snapshot build target to reflect the new source location
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:23:11 +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 DMA 8bits (hardware access)
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27
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28 Patrice Mandin
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29 */
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30
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31 /* Mint includes */
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32 #include <mint/osbind.h>
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33 #include <mint/falcon.h>
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34 #include <mint/cookie.h>
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35
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36 #include "SDL_audio.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_sysaudio.h"
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39
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40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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41
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42 #include "SDL_mintaudio.h"
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43 #include "SDL_mintaudio_dma8.h"
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44
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45 /*--- Defines ---*/
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46
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47 #define MINT_AUDIO_DRIVER_NAME "mint_dma8"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:dma8: "
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51 #if 0
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52 #define DEBUG_PRINT(what) \
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53 { \
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54 printf what; \
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55 }
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56 #else
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57 #define DEBUG_PRINT(what)
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58 #endif
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59
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60 /*--- Static variables ---*/
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61
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62 static unsigned long cookie_snd, cookie_mch;
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63
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64 /*--- Audio driver functions ---*/
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65
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66 static void Mint_CloseAudio(_THIS);
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67 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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68 static void Mint_LockAudio(_THIS);
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69 static void Mint_UnlockAudio(_THIS);
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70
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71 /* To check/init hardware audio */
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72 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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73 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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74
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75 /*--- Audio driver bootstrap functions ---*/
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76
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77 static int Audio_Available(void)
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78 {
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79 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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80
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81 /* Check if user asked a different audio driver */
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82 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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83 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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84 return 0;
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85 }
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86
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87 /* Cookie _MCH present ? if not, assume ST machine */
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88 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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89 cookie_mch = MCH_ST;
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90 }
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91
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92 /* Cookie _SND present ? if not, assume ST machine */
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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94 cookie_snd = SND_PSG;
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95 }
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96
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97 /* Check if we have 8 bits audio */
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98 if ((cookie_snd & SND_8BIT)==0) {
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99 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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100 return(0);
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101 }
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102
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103 /* Check if audio is lockable */
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104 if (cookie_snd & SND_16BIT) {
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105 if (Locksnd()!=1) {
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106 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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107 return(0);
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108 }
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109
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110 Unlocksnd();
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111 }
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112
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113 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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114 return(1);
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115 }
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116
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117 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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118 {
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119 SDL_free(device->hidden);
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120 SDL_free(device);
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121 }
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122
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123 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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124 {
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125 SDL_AudioDevice *this;
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126
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127 /* Initialize all variables that we clean on shutdown */
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128 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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129 if ( this ) {
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130 SDL_memset(this, 0, (sizeof *this));
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131 this->hidden = (struct SDL_PrivateAudioData *)
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132 SDL_malloc((sizeof *this->hidden));
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133 }
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134 if ( (this == NULL) || (this->hidden == NULL) ) {
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135 SDL_OutOfMemory();
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136 if ( this ) {
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137 SDL_free(this);
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138 }
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139 return(0);
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140 }
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141 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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142
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143 /* Set the function pointers */
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144 this->OpenAudio = Mint_OpenAudio;
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145 this->CloseAudio = Mint_CloseAudio;
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146 this->LockAudio = Mint_LockAudio;
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147 this->UnlockAudio = Mint_UnlockAudio;
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148 this->free = Audio_DeleteDevice;
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149
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150 return this;
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151 }
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152
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153 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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154 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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155 Audio_Available, Audio_CreateDevice
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156 };
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157
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158 static void Mint_LockAudio(_THIS)
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159 {
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160 void *oldpile;
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161
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162 /* Stop replay */
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163 oldpile=(void *)Super(0);
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164 DMAAUDIO_IO.control=0;
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165 Super(oldpile);
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166 }
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167
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168 static void Mint_UnlockAudio(_THIS)
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169 {
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170 void *oldpile;
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171
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172 /* Restart replay */
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173 oldpile=(void *)Super(0);
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174 DMAAUDIO_IO.control=3;
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175 Super(oldpile);
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176 }
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177
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178 static void Mint_CloseAudio(_THIS)
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179 {
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180 void *oldpile;
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181
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182 /* Stop replay */
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183 oldpile=(void *)Super(0);
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184 DMAAUDIO_IO.control=0;
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185 Super(oldpile);
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186
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187 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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188
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189 /* Disable interrupt */
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190 Jdisint(MFP_DMASOUND);
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191
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192 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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193
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194 /* Wait if currently playing sound */
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195 while (SDL_MintAudio_mutex != 0) {
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196 }
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197
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198 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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199
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200 /* Clear buffers */
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201 if (SDL_MintAudio_audiobuf[0]) {
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202 Mfree(SDL_MintAudio_audiobuf[0]);
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203 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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204 }
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205
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206 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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207 }
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208
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209 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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210 {
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211 int i, masterprediv, sfreq;
644
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212 unsigned long masterclock;
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213
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214 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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215 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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216 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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217 DEBUG_PRINT(("channels=%d, ", spec->channels));
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218 DEBUG_PRINT(("freq=%d\n", spec->freq));
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219
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220 /* Check formats available */
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221 spec->format = AUDIO_S8;
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222
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223 /* Calculate and select the closest frequency */
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224 sfreq=0;
644
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225 masterclock=MASTERCLOCK_STE;
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226 masterprediv=MASTERPREDIV_STE;
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227 switch(cookie_mch>>16) {
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228 /*
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229 case MCH_STE:
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230 masterclock=MASTERCLOCK_STE;
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231 masterprediv=MASTERPREDIV_STE;
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232 break;
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233 */
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234 case MCH_TT:
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235 masterclock=MASTERCLOCK_TT;
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236 masterprediv=MASTERPREDIV_TT;
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237 break;
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238 case MCH_F30:
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2911ff0a32bb Set MFP interrupt at end of frame
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diff changeset
239 case MCH_ARANYM:
644
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240 masterclock=MASTERCLOCK_FALCON1;
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241 masterprediv=MASTERPREDIV_FALCON;
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242 sfreq=1;
644
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243 break;
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244 }
961
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245
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246 MINTAUDIO_freqcount=0;
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247 for (i=sfreq;i<4;i++) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
248 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
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diff changeset
249 masterclock, i-sfreq, -1);
644
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250 }
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251
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252 #if 1
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253 for (i=0; i<MINTAUDIO_freqcount; i++) {
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254 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
255 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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diff changeset
256 MINTAUDIO_frequencies[i].predivisor
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257 ));
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258 }
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259 #endif
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260
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261 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
262 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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263
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264 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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265 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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diff changeset
266 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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267 DEBUG_PRINT(("channels=%d, ", spec->channels));
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268 DEBUG_PRINT(("freq=%d\n", spec->freq));
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269
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270 return 0;
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271 }
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272
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273 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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274 {
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275 void *oldpile;
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276 unsigned long buffer;
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277 unsigned char mode;
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278
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279 /* Set replay tracks */
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280 if (cookie_snd & SND_16BIT) {
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diff changeset
281 Settracks(0,0);
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282 Setmontracks(0);
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283 }
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284
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285 oldpile=(void *)Super(0);
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286
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diff changeset
287 /* Stop currently playing sound */
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diff changeset
288 DMAAUDIO_IO.control=0;
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289
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diff changeset
290 /* Set buffer */
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291 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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292 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
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293 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
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diff changeset
294 DMAAUDIO_IO.start_low = buffer & 255;
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295
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296 buffer += SDL_MintAudio_audiosize;
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diff changeset
297 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
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298 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
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299 DMAAUDIO_IO.end_low = buffer & 255;
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300
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301 mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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302 if (spec->channels==1) {
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303 mode |= 1<<7;
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304 }
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305 DMAAUDIO_IO.sound_ctrl = mode;
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306
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307 /* Set interrupt */
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308 Jdisint(MFP_DMASOUND);
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309 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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310 Jenabint(MFP_DMASOUND);
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311
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312 if (cookie_snd & SND_16BIT) {
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313 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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314 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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315 }
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316 }
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317
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318 /* Go */
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319 DMAAUDIO_IO.control = 3; /* playback + repeat */
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320
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321 Super(oldpile);
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322 }
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323
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324 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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325 {
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326 SDL_MintAudio_device = this;
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327
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328 /* Check audio capabilities */
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329 if (Mint_CheckAudio(this, spec)==-1) {
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330 return -1;
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331 }
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332
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333 SDL_CalculateAudioSpec(spec);
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334
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335 /* Allocate memory for audio buffers in DMA-able RAM */
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336 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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337
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338 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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339 if (SDL_MintAudio_audiobuf[0]==NULL) {
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340 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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341 return (-1);
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342 }
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343 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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344 SDL_MintAudio_numbuf=0;
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1107
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345 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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346 SDL_MintAudio_audiosize = spec->size;
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347 SDL_MintAudio_mutex = 0;
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348
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349 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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350 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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351
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352 /* Setup audio hardware */
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353 Mint_InitAudio(this, spec);
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354
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355 return(1); /* We don't use threaded audio */
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356 }