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annotate src/audio/mint/SDL_mintaudio_dma8.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
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 DMA 8bits (hardware access)
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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_dma8.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_dma8"
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47
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48 /* Debug print info */
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49 #define DEBUG_NAME "audio:dma8: "
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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
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63 /*--- Audio driver functions ---*/
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64
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65 static void Mint_CloseAudio(_THIS);
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66 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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67 static void Mint_LockAudio(_THIS);
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68 static void Mint_UnlockAudio(_THIS);
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69
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70 /* To check/init hardware audio */
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71 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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72 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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73
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74 /*--- Audio driver bootstrap functions ---*/
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75
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76 static int Audio_Available(void)
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77 {
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78 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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79
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80 /* Check if user asked a different audio driver */
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81 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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82 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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83 return 0;
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84 }
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85
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86 /* Cookie _MCH present ? if not, assume ST machine */
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87 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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88 cookie_mch = MCH_ST;
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89 }
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90
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91 /* Cookie _SND present ? if not, assume ST machine */
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92 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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93 cookie_snd = SND_PSG;
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94 }
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95
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96 /* Check if we have 8 bits audio */
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97 if ((cookie_snd & SND_8BIT)==0) {
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98 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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99 return(0);
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100 }
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101
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102 /* Check if audio is lockable */
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103 if (cookie_snd & SND_16BIT) {
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104 if (Locksnd()!=1) {
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105 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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106 return(0);
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107 }
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108
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109 Unlocksnd();
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110 }
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111
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112 DEBUG_PRINT((DEBUG_NAME "8 bits 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_DMA8_bootstrap = {
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153 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits 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 DMAAUDIO_IO.control=0;
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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 DMAAUDIO_IO.control=3;
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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 DMAAUDIO_IO.control=0;
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184 Super(oldpile);
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185
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186 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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187
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188 /* Disable interrupt */
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189 Jdisint(MFP_DMASOUND);
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190
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191 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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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 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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198
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199 /* Clear buffers */
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200 if (SDL_MintAudio_audiobuf[0]) {
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201 Mfree(SDL_MintAudio_audiobuf[0]);
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202 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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203 }
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204
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205 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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206 }
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207
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208 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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209 {
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210 int i, masterprediv, sfreq;
644
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211 unsigned long masterclock;
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212
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213 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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214 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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215 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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216 DEBUG_PRINT(("channels=%d, ", spec->channels));
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217 DEBUG_PRINT(("freq=%d\n", spec->freq));
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218
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219 /* Check formats available */
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220 spec->format = AUDIO_S8;
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221
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222 /* Calculate and select the closest frequency */
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223 sfreq=0;
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224 masterclock=MASTERCLOCK_STE;
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225 masterprediv=MASTERPREDIV_STE;
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226 switch(cookie_mch>>16) {
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227 /*
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228 case MCH_STE:
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229 masterclock=MASTERCLOCK_STE;
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230 masterprediv=MASTERPREDIV_STE;
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231 break;
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232 */
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233 case MCH_TT:
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234 masterclock=MASTERCLOCK_TT;
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235 masterprediv=MASTERPREDIV_TT;
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236 break;
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237 case MCH_F30:
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2911ff0a32bb Set MFP interrupt at end of frame
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diff changeset
238 case MCH_ARANYM:
644
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239 masterclock=MASTERCLOCK_FALCON1;
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240 masterprediv=MASTERPREDIV_FALCON;
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241 sfreq=1;
644
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242 break;
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243 }
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244
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245 MINTAUDIO_freqcount=0;
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246 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
247 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
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diff changeset
248 masterclock, i-sfreq, -1);
644
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249 }
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250
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251 #if 1
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252 for (i=0; i<MINTAUDIO_freqcount; i++) {
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253 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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254 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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255 MINTAUDIO_frequencies[i].predivisor
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256 ));
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257 }
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258 #endif
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259
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260 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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261 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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262
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263 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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264 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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diff changeset
265 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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266 DEBUG_PRINT(("channels=%d, ", spec->channels));
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267 DEBUG_PRINT(("freq=%d\n", spec->freq));
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268
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269 return 0;
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270 }
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271
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272 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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273 {
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274 void *oldpile;
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275 unsigned long buffer;
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276 unsigned char mode;
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277
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278 /* Set replay tracks */
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diff changeset
279 if (cookie_snd & SND_16BIT) {
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280 Settracks(0,0);
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281 Setmontracks(0);
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282 }
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283
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284 oldpile=(void *)Super(0);
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285
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286 /* Stop currently playing sound */
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287 DMAAUDIO_IO.control=0;
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288
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289 /* Set buffer */
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290 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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291 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
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292 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
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293 DMAAUDIO_IO.start_low = buffer & 255;
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294
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295 buffer += SDL_MintAudio_audiosize;
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diff changeset
296 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
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297 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
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298 DMAAUDIO_IO.end_low = buffer & 255;
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299
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300 mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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301 if (spec->channels==1) {
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302 mode |= 1<<7;
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303 }
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304 DMAAUDIO_IO.sound_ctrl = mode;
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305
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306 /* Set interrupt */
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307 Jdisint(MFP_DMASOUND);
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308 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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309 Jenabint(MFP_DMASOUND);
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310
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311 if (cookie_snd & SND_16BIT) {
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312 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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313 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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314 }
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315 }
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316
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317 /* Go */
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318 DMAAUDIO_IO.control = 3; /* playback + repeat */
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319
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320 Super(oldpile);
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321 }
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322
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323 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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324 {
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325 SDL_MintAudio_device = this;
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326
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327 /* Check audio capabilities */
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328 if (Mint_CheckAudio(this, spec)==-1) {
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329 return -1;
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330 }
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331
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332 SDL_CalculateAudioSpec(spec);
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333
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334 /* Allocate memory for audio buffers in DMA-able RAM */
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335 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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336
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337 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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338 if (SDL_MintAudio_audiobuf[0]==NULL) {
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339 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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340 return (-1);
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341 }
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342 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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343 SDL_MintAudio_numbuf=0;
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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344 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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345 SDL_MintAudio_audiosize = spec->size;
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346 SDL_MintAudio_mutex = 0;
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347
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348 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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349 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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350
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351 /* Setup audio hardware */
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352 Mint_InitAudio(this, spec);
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353
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354 return(1); /* We don't use threaded audio */
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355 }