Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device

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Audio bootstraps can now specify that a driver is only to be used if explicitly requested (for things like the "disk" driver that is always available but you would never want to default to using). Trimmed out code that can be handled by stubs in the core. The "dummy" driver is pretty damned small now. :)
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 04 Oct 2006 21:27:53 +0000
parents b19680c84cdf
children 1f156fd874fa
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
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78 Audio_Available(void)
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79 {
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80 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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81
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82 /* Check if user asked a different audio driver */
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83 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME) != 0)) {
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84 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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85 return 0;
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86 }
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87
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88 /* Cookie _MCH present ? if not, assume ST machine */
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89 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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90 cookie_mch = MCH_ST;
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91 }
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92
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93 /* Cookie _SND present ? if not, assume ST machine */
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94 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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95 cookie_snd = SND_PSG;
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96 }
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97
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98 /* Check if we have 8 bits audio */
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99 if ((cookie_snd & SND_8BIT) == 0) {
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100 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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101 return (0);
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102 }
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103
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104 /* Check if audio is lockable */
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105 if (cookie_snd & SND_16BIT) {
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106 if (Locksnd() != 1) {
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107 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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108 return (0);
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109 }
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110
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111 Unlocksnd();
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112 }
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113
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114 DEBUG_PRINT((DEBUG_NAME "8 bits 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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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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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 /* Uses interrupt driven audio, without thread */
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154 #if SDL_THREADS_DISABLED
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155 this->SkipMixerLock = 1;
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156 #endif
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157
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158 return this;
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159 }
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160
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161 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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162 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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163 Audio_Available, Audio_CreateDevice, 0
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164 };
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165
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166 static void
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167 Mint_LockAudio(_THIS)
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168 {
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169 void *oldpile;
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170
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171 /* Stop replay */
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172 oldpile = (void *) Super(0);
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173 DMAAUDIO_IO.control = 0;
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174 Super(oldpile);
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175 }
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176
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177 static void
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178 Mint_UnlockAudio(_THIS)
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179 {
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180 void *oldpile;
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181
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182 /* Restart replay */
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183 oldpile = (void *) Super(0);
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184 DMAAUDIO_IO.control = 3;
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185 Super(oldpile);
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186 }
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187
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188 static void
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189 Mint_CloseAudio(_THIS)
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190 {
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191 void *oldpile;
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192
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193 /* Stop replay */
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194 oldpile = (void *) Super(0);
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195 DMAAUDIO_IO.control = 0;
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196 Super(oldpile);
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197
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198 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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199
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200 /* Disable interrupt */
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201 Jdisint(MFP_DMASOUND);
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202
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203 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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204
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205 /* Wait if currently playing sound */
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206 while (SDL_MintAudio_mutex != 0) {
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207 }
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208
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209 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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210
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211 /* Clear buffers */
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212 if (SDL_MintAudio_audiobuf[0]) {
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213 Mfree(SDL_MintAudio_audiobuf[0]);
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214 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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215 }
644
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216
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217 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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218 }
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219
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220 static int
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221 Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
644
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222 {
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223 int i, masterprediv, sfreq;
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224 unsigned long masterclock;
644
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225
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226 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",
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227 SDL_AUDIO_BITSIZE(spec->format)));
2005
45af7d69f8eb MiNT audio driver cleanups for clamping types and channels to supported
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228 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(spec->format)));
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229 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(spec->format)));
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230 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(spec->format)));
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231 DEBUG_PRINT(("channels=%d, ", spec->channels));
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232 DEBUG_PRINT(("freq=%d\n", spec->freq));
644
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233
2005
45af7d69f8eb MiNT audio driver cleanups for clamping types and channels to supported
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diff changeset
234 if (spec->channels > 2) {
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235 spec->channels = 2; /* no more than stereo! */
2005
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diff changeset
236 }
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diff changeset
237
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238 /* Check formats available */
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239 spec->format = AUDIO_S8;
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240
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241 /* Calculate and select the closest frequency */
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242 sfreq = 0;
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243 masterclock = MASTERCLOCK_STE;
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244 masterprediv = MASTERPREDIV_STE;
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245 switch (cookie_mch >> 16) {
644
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246 /*
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247 case MCH_STE:
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248 masterclock=MASTERCLOCK_STE;
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249 masterprediv=MASTERPREDIV_STE;
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250 break;
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251 */
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252 case MCH_TT:
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253 masterclock = MASTERCLOCK_TT;
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254 masterprediv = MASTERPREDIV_TT;
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255 break;
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256 case MCH_F30:
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257 case MCH_ARANYM:
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258 masterclock = MASTERCLOCK_FALCON1;
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259 masterprediv = MASTERPREDIV_FALCON;
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260 sfreq = 1;
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diff changeset
261 break;
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diff changeset
262 }
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diff changeset
263
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
264 MINTAUDIO_freqcount = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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265 for (i = sfreq; i < 4; i++) {
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266 SDL_MintAudio_AddFrequency(this,
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267 masterclock / (masterprediv * (1 << i)),
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diff changeset
268 masterclock, i - sfreq, -1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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269 }
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270
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271 #if 1
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272 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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273 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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274 i, MINTAUDIO_frequencies[i].frequency,
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275 MINTAUDIO_frequencies[i].masterclock,
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276 MINTAUDIO_frequencies[i].predivisor));
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277 }
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278 #endif
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279
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280 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
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281 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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282
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283 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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284 SDL_AUDIO_BITSIZE(spec->format)));
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285 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(spec->format)));
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286 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(spec->format)));
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287 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(spec->format)));
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288 DEBUG_PRINT(("channels=%d, ", spec->channels));
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289 DEBUG_PRINT(("freq=%d\n", spec->freq));
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290
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291 return 0;
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292 }
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293
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294 static void
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295 Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
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296 {
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297 void *oldpile;
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298 unsigned long buffer;
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299 unsigned char mode;
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300
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301 /* Set replay tracks */
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302 if (cookie_snd & SND_16BIT) {
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303 Settracks(0, 0);
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304 Setmontracks(0);
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305 }
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306
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307 oldpile = (void *) Super(0);
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308
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309 /* Stop currently playing sound */
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310 DMAAUDIO_IO.control = 0;
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311
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312 /* Set buffer */
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313 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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314 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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315 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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316 DMAAUDIO_IO.start_low = buffer & 255;
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317
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318 buffer += SDL_MintAudio_audiosize;
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319 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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320 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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321 DMAAUDIO_IO.end_low = buffer & 255;
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322
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323 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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324 if (spec->channels == 1) {
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325 mode |= 1 << 7;
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326 }
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327 DMAAUDIO_IO.sound_ctrl = mode;
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328
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329 /* Set interrupt */
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330 Jdisint(MFP_DMASOUND);
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331 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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332 Jenabint(MFP_DMASOUND);
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333
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334 if (cookie_snd & SND_16BIT) {
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335 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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336 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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337 }
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338 }
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339
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340 /* Go */
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341 DMAAUDIO_IO.control = 3; /* playback + repeat */
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342
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343 Super(oldpile);
644
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344 }
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345
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346 static int
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347 Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
644
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348 {
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349 SDL_MintAudio_device = this;
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350
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351 /* Check audio capabilities */
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352 if (Mint_CheckAudio(this, spec) == -1) {
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353 return -1;
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354 }
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355
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356 SDL_CalculateAudioSpec(spec);
644
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357
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358 /* Allocate memory for audio buffers in DMA-able RAM */
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359 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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360
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361 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size * 2, MX_STRAM);
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362 if (SDL_MintAudio_audiobuf[0] == NULL) {
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363 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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364 return (-1);
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365 }
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366 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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367 SDL_MintAudio_numbuf = 0;
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368 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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369 SDL_MintAudio_audiosize = spec->size;
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370 SDL_MintAudio_mutex = 0;
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371
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372 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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373 SDL_MintAudio_audiobuf[0]));
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374 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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375 SDL_MintAudio_audiobuf[1]));
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376
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377 SDL_MintAudio_CheckFpu();
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diff changeset
378
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379 /* Setup audio hardware */
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380 Mint_InitAudio(this, spec);
644
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381
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382 return (1); /* We don't use threaded audio */
644
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383 }
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384
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
385 /* vi: set ts=4 sw=4 expandtab: */