Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 3846:66fb40445587 SDL-ryan-multiple-audio-device

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Removed distinction between "available" and "init" in audio backends, since both had to be checked for success as a pair at the higher level and several of the Available methods were just always-succeed placeholders anyhow. Now the availability check is done in the init code, and the higher level tries all possible drivers until one manages to initialize successfully.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 09:09:21 +0000
parents 1f156fd874fa
children
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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 static void
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65 MINTDMA8_LockDevice(_THIS)
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66 {
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67 void *oldpile;
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68
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69 /* Stop replay */
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70 oldpile = (void *) Super(0);
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71 DMAAUDIO_IO.control = 0;
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72 Super(oldpile);
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73 }
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74
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75 static void
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76 MINTDMA8_UnlockDevice(_THIS)
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77 {
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78 void *oldpile;
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79
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80 /* Restart replay */
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81 oldpile = (void *) Super(0);
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82 DMAAUDIO_IO.control = 3;
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83 Super(oldpile);
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84 }
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85
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86 static void
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87 MINTDMA8_CloseDevice(_THIS)
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88 {
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89 if (this->hidden != NULL) {
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90 /* Stop replay */
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91 void *oldpile = (void *) Super(0);
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92
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93 DMAAUDIO_IO.control = 0;
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94 Super(oldpile);
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96 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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98 /* Disable interrupt */
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99 Jdisint(MFP_DMASOUND);
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101 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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103 /* Wait if currently playing sound */
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104 while (SDL_MintAudio_mutex != 0) {}
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106 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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108 /* Clear buffers */
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109 if (SDL_MintAudio_audiobuf[0]) {
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110 Mfree(SDL_MintAudio_audiobuf[0]);
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111 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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112 }
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114 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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115 SDL_free(this->buffer);
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116 this->buffer = NULL;
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117 }
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118 }
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119
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120 static int
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121 MINTDMA8_CheckAudio(_THIS)
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122 {
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123 int i, masterprediv, sfreq;
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124 unsigned long masterclock;
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125
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126 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",
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127 SDL_AUDIO_BITSIZE(this->spec.format)));
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128 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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129 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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130 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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131 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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132 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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133
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134 if (this->spec.channels > 2) {
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135 this->spec.channels = 2; /* no more than stereo! */
2005
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136 }
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137
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138 /* Check formats available */
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139 this->spec.format = AUDIO_S8;
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140
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141 /* Calculate and select the closest frequency */
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142 sfreq = 0;
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143 masterclock = MASTERCLOCK_STE;
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144 masterprediv = MASTERPREDIV_STE;
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145 switch (cookie_mch >> 16) {
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146 /*
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147 case MCH_STE:
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148 masterclock=MASTERCLOCK_STE;
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149 masterprediv=MASTERPREDIV_STE;
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150 break;
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151 */
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152 case MCH_TT:
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153 masterclock = MASTERCLOCK_TT;
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154 masterprediv = MASTERPREDIV_TT;
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155 break;
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156 case MCH_F30:
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157 case MCH_ARANYM:
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158 masterclock = MASTERCLOCK_FALCON1;
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159 masterprediv = MASTERPREDIV_FALCON;
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160 sfreq = 1;
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161 break;
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162 }
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163
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164 MINTAUDIO_freqcount = 0;
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165 for (i = sfreq; i < 4; i++) {
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166 SDL_MintAudio_AddFrequency(this,
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167 masterclock / (masterprediv * (1 << i)),
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168 masterclock, i - sfreq, -1);
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169 }
644
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170
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171 #if 1
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172 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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173 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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174 i, MINTAUDIO_frequencies[i].frequency,
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175 MINTAUDIO_frequencies[i].masterclock,
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176 MINTAUDIO_frequencies[i].predivisor));
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177 }
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178 #endif
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179
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180 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq);
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181 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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182
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183 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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184 SDL_AUDIO_BITSIZE(this->spec.format)));
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185 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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186 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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187 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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188 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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189 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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190
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191 return 0;
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192 }
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193
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194 static void
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195 MINTDMA8_InitAudio(_THIS)
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196 {
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197 void *oldpile;
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198 unsigned long buffer;
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199 unsigned char mode;
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200
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201 /* Set replay tracks */
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202 if (cookie_snd & SND_16BIT) {
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203 Settracks(0, 0);
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204 Setmontracks(0);
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205 }
644
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206
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207 oldpile = (void *) Super(0);
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208
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209 /* Stop currently playing sound */
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210 DMAAUDIO_IO.control = 0;
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211
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212 /* Set buffer */
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213 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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214 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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215 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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216 DMAAUDIO_IO.start_low = buffer & 255;
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217
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218 buffer += SDL_MintAudio_audiosize;
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219 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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220 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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221 DMAAUDIO_IO.end_low = buffer & 255;
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222
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223 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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224 if (this->spec.channels == 1) {
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225 mode |= 1 << 7;
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226 }
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227 DMAAUDIO_IO.sound_ctrl = mode;
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228
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229 /* Set interrupt */
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230 Jdisint(MFP_DMASOUND);
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231 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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232 Jenabint(MFP_DMASOUND);
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233
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234 if (cookie_snd & SND_16BIT) {
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235 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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236 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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237 }
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238 }
1098
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diff changeset
239
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240 /* Go */
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diff changeset
241 DMAAUDIO_IO.control = 3; /* playback + repeat */
644
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242
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243 Super(oldpile);
644
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244 }
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245
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246 static int
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247 MINTDMA8_OpenDevice(_THIS, const char *devname, int iscapture)
644
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248 {
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249 SDL_MintAudio_device = this;
644
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250
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251 /* Check audio capabilities */
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252 if (MINTDMA8_CheckAudio(this) == -1) {
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253 return 0;
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254 }
644
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255
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256 /* Initialize all variables that we clean on shutdown */
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257 this->hidden = (struct SDL_PrivateAudioData *)
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258 SDL_malloc((sizeof *this->hidden));
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259 if (this->hidden == NULL) {
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260 SDL_OutOfMemory();
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261 return 0;
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262 }
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263 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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264
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265 SDL_CalculateAudioSpec(&this->spec);
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266
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267 /* Allocate memory for audio buffers in DMA-able RAM */
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268 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size));
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269
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270 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(this->spec.size * 2, MX_STRAM);
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271 if (SDL_MintAudio_audiobuf[0] == NULL) {
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272 SDL_free(this->hidden);
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273 this->hidden = NULL;
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274 SDL_OutOfMemory();
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275 return 0;
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276 }
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277 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size;
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278 SDL_MintAudio_numbuf = 0;
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279 SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2);
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280 SDL_MintAudio_audiosize = this->spec.size;
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281 SDL_MintAudio_mutex = 0;
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282
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283 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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284 SDL_MintAudio_audiobuf[0]));
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285 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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286 SDL_MintAudio_audiobuf[1]));
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287
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288 SDL_MintAudio_CheckFpu();
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289
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290 /* Setup audio hardware */
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291 MINTDMA8_InitAudio(this);
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292
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293 return 1; /* good to go. */
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294 }
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295
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296 static int
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297 MINTDMA8_Init(SDL_AudioDriverImpl *impl)
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298 {
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299 /* Cookie _MCH present ? if not, assume ST machine */
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300 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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301 cookie_mch = MCH_ST;
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302 }
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303
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304 /* Cookie _SND present ? if not, assume ST machine */
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305 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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306 cookie_snd = SND_PSG;
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307 }
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308
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309 /* Check if we have 8 bits audio */
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310 if ((cookie_snd & SND_8BIT) == 0) {
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311 SDL_SetError(DEBUG_NAME "no 8 bits sound");
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312 return 0;
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313 }
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314
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315 /* Check if audio is lockable */
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316 if (cookie_snd & SND_16BIT) {
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317 if (Locksnd() != 1) {
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318 SDL_SetError(DEBUG_NAME "audio locked by other application");
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319 return 0;
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320 }
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321
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322 Unlocksnd();
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323 }
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324
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325 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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diff changeset
326
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327 /* Set the function pointers */
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328 impl->OpenDevice = MINTDMA8_OpenDevice;
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329 impl->CloseDevice = MINTDMA8_CloseDevice;
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330 impl->LockAudio = MINTDMA8_LockAudio;
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331 impl->UnlockAudio = MINTDMA8_UnlockAudio;
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diff changeset
332 impl->OnlyHasDefaultOutputDevice = 1;
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diff changeset
333 impl->ProvidesOwnCallbackThread = 1;
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diff changeset
334 impl->SkipMixerLock = 1;
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diff changeset
335
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diff changeset
336 return 1;
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diff changeset
337 }
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diff changeset
338
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diff changeset
339 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
3846
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diff changeset
340 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver", MINTDMA8_Init, 0
3820
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diff changeset
341 };
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diff changeset
342
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343 /* vi: set ts=4 sw=4 expandtab: */