Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 3843:ce229f6b5ce0 SDL-ryan-multiple-audio-device

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Added a FIXME.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 06:42:06 +0000
parents 1f156fd874fa
children 66fb40445587
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
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65 static int
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66 MINTDMA8_Available(void)
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67 {
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68 /* Cookie _MCH present ? if not, assume ST machine */
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69 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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70 cookie_mch = MCH_ST;
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71 }
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72
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73 /* Cookie _SND present ? if not, assume ST machine */
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74 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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75 cookie_snd = SND_PSG;
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76 }
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77
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78 /* Check if we have 8 bits audio */
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79 if ((cookie_snd & SND_8BIT) == 0) {
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80 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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81 return (0);
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82 }
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83
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84 /* Check if audio is lockable */
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85 if (cookie_snd & SND_16BIT) {
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86 if (Locksnd() != 1) {
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87 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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88 return (0);
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89 }
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90
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91 Unlocksnd();
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92 }
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93
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94 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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95 return (1);
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96 }
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97
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98 static void
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99 MINTDMA8_LockDevice(_THIS)
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100 {
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101 void *oldpile;
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102
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103 /* Stop replay */
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104 oldpile = (void *) Super(0);
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105 DMAAUDIO_IO.control = 0;
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106 Super(oldpile);
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107 }
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108
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109 static void
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110 MINTDMA8_UnlockDevice(_THIS)
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111 {
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112 void *oldpile;
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113
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114 /* Restart replay */
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115 oldpile = (void *) Super(0);
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116 DMAAUDIO_IO.control = 3;
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117 Super(oldpile);
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118 }
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119
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120 static void
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121 MINTDMA8_CloseDevice(_THIS)
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122 {
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123 if (this->hidden != NULL) {
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124 /* Stop replay */
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125 void *oldpile = (void *) Super(0);
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126
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127 DMAAUDIO_IO.control = 0;
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128 Super(oldpile);
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129
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130 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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132 /* Disable interrupt */
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133 Jdisint(MFP_DMASOUND);
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134
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135 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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137 /* Wait if currently playing sound */
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138 while (SDL_MintAudio_mutex != 0) {}
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139
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140 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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141
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142 /* Clear buffers */
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143 if (SDL_MintAudio_audiobuf[0]) {
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144 Mfree(SDL_MintAudio_audiobuf[0]);
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145 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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146 }
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147
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148 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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149 SDL_free(this->buffer);
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150 this->buffer = NULL;
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151 }
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152 }
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153
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154 static int
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155 MINTDMA8_CheckAudio(_THIS)
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156 {
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157 int i, masterprediv, sfreq;
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158 unsigned long masterclock;
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159
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160 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",
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161 SDL_AUDIO_BITSIZE(this->spec.format)));
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162 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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163 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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164 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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165 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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166 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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167
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168 if (this->spec.channels > 2) {
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169 this->spec.channels = 2; /* no more than stereo! */
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170 }
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171
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172 /* Check formats available */
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173 this->spec.format = AUDIO_S8;
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174
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175 /* Calculate and select the closest frequency */
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176 sfreq = 0;
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177 masterclock = MASTERCLOCK_STE;
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178 masterprediv = MASTERPREDIV_STE;
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179 switch (cookie_mch >> 16) {
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180 /*
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181 case MCH_STE:
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182 masterclock=MASTERCLOCK_STE;
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183 masterprediv=MASTERPREDIV_STE;
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184 break;
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185 */
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186 case MCH_TT:
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187 masterclock = MASTERCLOCK_TT;
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188 masterprediv = MASTERPREDIV_TT;
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189 break;
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190 case MCH_F30:
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191 case MCH_ARANYM:
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192 masterclock = MASTERCLOCK_FALCON1;
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193 masterprediv = MASTERPREDIV_FALCON;
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194 sfreq = 1;
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195 break;
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196 }
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197
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198 MINTAUDIO_freqcount = 0;
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199 for (i = sfreq; i < 4; i++) {
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200 SDL_MintAudio_AddFrequency(this,
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201 masterclock / (masterprediv * (1 << i)),
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202 masterclock, i - sfreq, -1);
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203 }
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204
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205 #if 1
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206 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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207 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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208 i, MINTAUDIO_frequencies[i].frequency,
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209 MINTAUDIO_frequencies[i].masterclock,
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210 MINTAUDIO_frequencies[i].predivisor));
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211 }
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212 #endif
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213
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214 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq);
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215 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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216
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217 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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218 SDL_AUDIO_BITSIZE(this->spec.format)));
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219 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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220 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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221 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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222 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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223 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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224
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225 return 0;
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226 }
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227
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228 static void
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229 MINTDMA8_InitAudio(_THIS)
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230 {
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231 void *oldpile;
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232 unsigned long buffer;
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233 unsigned char mode;
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234
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235 /* Set replay tracks */
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236 if (cookie_snd & SND_16BIT) {
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237 Settracks(0, 0);
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238 Setmontracks(0);
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239 }
644
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240
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241 oldpile = (void *) Super(0);
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242
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243 /* Stop currently playing sound */
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244 DMAAUDIO_IO.control = 0;
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245
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246 /* Set buffer */
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247 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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248 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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249 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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250 DMAAUDIO_IO.start_low = buffer & 255;
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251
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252 buffer += SDL_MintAudio_audiosize;
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253 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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254 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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255 DMAAUDIO_IO.end_low = buffer & 255;
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256
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257 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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258 if (this->spec.channels == 1) {
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259 mode |= 1 << 7;
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260 }
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261 DMAAUDIO_IO.sound_ctrl = mode;
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262
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263 /* Set interrupt */
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264 Jdisint(MFP_DMASOUND);
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265 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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266 Jenabint(MFP_DMASOUND);
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267
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268 if (cookie_snd & SND_16BIT) {
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269 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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270 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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271 }
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272 }
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273
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274 /* Go */
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275 DMAAUDIO_IO.control = 3; /* playback + repeat */
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276
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277 Super(oldpile);
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278 }
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279
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280 static int
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281 MINTDMA8_OpenDevice(_THIS, const char *devname, int iscapture)
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282 {
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283 SDL_MintAudio_device = this;
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284
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285 /* Check audio capabilities */
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286 if (MINTDMA8_CheckAudio(this) == -1) {
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287 return 0;
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288 }
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289
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290 /* Initialize all variables that we clean on shutdown */
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291 this->hidden = (struct SDL_PrivateAudioData *)
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292 SDL_malloc((sizeof *this->hidden));
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293 if (this->hidden == NULL) {
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294 SDL_OutOfMemory();
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295 return 0;
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296 }
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297 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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298
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299 SDL_CalculateAudioSpec(&this->spec);
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300
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301 /* Allocate memory for audio buffers in DMA-able RAM */
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302 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size));
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303
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304 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(this->spec.size * 2, MX_STRAM);
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305 if (SDL_MintAudio_audiobuf[0] == NULL) {
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306 SDL_free(this->hidden);
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307 this->hidden = NULL;
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308 SDL_OutOfMemory();
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309 return 0;
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310 }
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311 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size;
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312 SDL_MintAudio_numbuf = 0;
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313 SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2);
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314 SDL_MintAudio_audiosize = this->spec.size;
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315 SDL_MintAudio_mutex = 0;
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316
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317 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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318 SDL_MintAudio_audiobuf[0]));
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319 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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320 SDL_MintAudio_audiobuf[1]));
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321
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322 SDL_MintAudio_CheckFpu();
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323
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324 /* Setup audio hardware */
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325 MINTDMA8_InitAudio(this);
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326
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327 return 1; /* good to go. */
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328 }
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329
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330 static int
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331 MINTDMA8_Init(SDL_AudioDriverImpl *impl)
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332 {
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333 /* Set the function pointers */
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334 impl->OpenDevice = MINTDMA8_OpenDevice;
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335 impl->CloseDevice = MINTDMA8_CloseDevice;
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336 impl->LockAudio = MINTDMA8_LockAudio;
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337 impl->UnlockAudio = MINTDMA8_UnlockAudio;
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338 impl->OnlyHasDefaultOutputDevice = 1;
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339 impl->ProvidesOwnCallbackThread = 1;
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340 impl->SkipMixerLock = 1;
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341
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342 return 1;
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343 }
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344
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345 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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346 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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347 MINTDMA8_Available, MINTDMA8_Init, 0
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348 };
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349
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350 /* vi: set ts=4 sw=4 expandtab: */