Mercurial > sdl-ios-xcode
annotate src/audio/mint/SDL_mintaudio_mcsn.c @ 3846:66fb40445587 SDL-ryan-multiple-audio-device
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> |
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date | Tue, 17 Oct 2006 09:09:21 +0000 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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Updated copyright information for 2004 (Happy New Year!)
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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 XBIOS functions (MacSound compatible driver) |
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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 #include <support.h> |
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32 |
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33 /* Mint includes */ |
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34 #include <mint/osbind.h> |
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35 #include <mint/falcon.h> |
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36 #include <mint/cookie.h> |
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37 |
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38 #include "SDL_audio.h" |
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39 #include "../SDL_audio_c.h" |
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40 #include "../SDL_sysaudio.h" |
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41 |
1412 | 42 #include "../../video/ataricommon/SDL_atarimxalloc_c.h" |
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43 |
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44 #include "SDL_mintaudio.h" |
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45 #include "SDL_mintaudio_mcsn.h" |
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46 |
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47 /*--- Defines ---*/ |
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48 |
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49 #define MINT_AUDIO_DRIVER_NAME "mint_mcsn" |
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50 |
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51 /* Debug print info */ |
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52 #define DEBUG_NAME "audio:mcsn: " |
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53 #if 0 |
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54 #define DEBUG_PRINT(what) \ |
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55 { \ |
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56 printf what; \ |
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57 } |
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58 #else |
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59 #define DEBUG_PRINT(what) |
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60 #endif |
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61 |
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62 /*--- Static variables ---*/ |
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63 |
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64 static unsigned long cookie_snd = 0; |
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65 static unsigned long cookie_mch = 0; |
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66 static cookie_mcsn_t *cookie_mcsn = NULL; |
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67 |
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68 static void |
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69 MINTMCSN_LockDevice(_THIS) |
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70 { |
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71 /* Stop replay */ |
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72 Buffoper(0); |
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73 } |
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74 |
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75 static void |
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76 MINTMCSN_UnlockDevice(_THIS) |
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77 { |
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78 /* Restart replay */ |
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79 Buffoper(SB_PLA_ENA | SB_PLA_RPT); |
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80 } |
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81 |
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82 static void |
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83 MINTMCSN_CloseDevice(_THIS) |
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84 { |
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85 if (this->hidden != NULL) { |
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86 /* Stop replay */ |
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87 SDL_MintAudio_WaitThread(); |
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88 Buffoper(0); |
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89 |
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90 if (!SDL_MintAudio_mint_present) { |
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91 /* Uninstall interrupt */ |
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92 Jdisint(MFP_DMASOUND); |
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93 } |
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94 |
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95 /* Wait if currently playing sound */ |
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96 while (SDL_MintAudio_mutex != 0) {} |
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97 |
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98 /* Clear buffers */ |
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99 if (SDL_MintAudio_audiobuf[0]) { |
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100 Mfree(SDL_MintAudio_audiobuf[0]); |
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101 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
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102 } |
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103 |
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104 /* Unlock sound system */ |
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105 Unlocksnd(); |
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106 |
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107 SDL_free(this->hidden); |
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108 this->hidden = NULL; |
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109 } |
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110 } |
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111 |
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112 static int |
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113 MINTMCSN_CheckAudio(_THIS) |
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114 { |
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115 int i; |
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116 unsigned long masterclock, masterprediv; |
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117 |
2043 | 118 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", |
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119 SDL_AUDIO_BITSIZE(this->spec.format))); |
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120 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format))); |
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121 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format))); |
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122 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format))); |
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123 DEBUG_PRINT(("channels=%d, ", this->spec.channels)); |
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124 DEBUG_PRINT(("freq=%d\n", this->spec.freq)); |
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125 |
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126 if (this->spec.channels > 2) { |
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127 this->spec.channels = 2; /* no more than stereo! */ |
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128 } |
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129 |
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130 /* Check formats available */ |
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131 MINTAUDIO_freqcount = 0; |
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132 switch (cookie_mcsn->play) { |
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133 case MCSN_ST: |
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134 this->spec.channels = 1; |
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135 this->spec.format = AUDIO_S8; /* FIXME: is it signed or unsigned ? */ |
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136 SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1); |
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137 break; |
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138 case MCSN_TT: /* Also STE, Mega STE */ |
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139 this->spec.format = AUDIO_S8; |
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140 masterclock = MASTERCLOCK_STE; |
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141 masterprediv = MASTERPREDIV_STE; |
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142 if ((cookie_mch >> 16) == MCH_TT) { |
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143 masterclock = MASTERCLOCK_TT; |
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144 masterprediv = MASTERPREDIV_TT; |
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145 } |
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146 for (i = 0; i < 4; i++) { |
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147 SDL_MintAudio_AddFrequency(this, |
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148 masterclock / (masterprediv * |
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149 (1 << i)), |
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150 masterclock, 3 - i, -1); |
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151 } |
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152 break; |
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153 case MCSN_FALCON: /* Also Mac */ |
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154 for (i = 1; i < 12; i++) { |
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155 /* Remove unusable Falcon codec predivisors */ |
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156 if ((i == 6) || (i == 8) || (i == 10)) { |
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157 continue; |
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158 } |
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159 SDL_MintAudio_AddFrequency(this, |
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160 MASTERCLOCK_FALCON1 / |
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161 (MASTERPREDIV_FALCON * (i + 1)), |
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162 CLK25M, i + 1, -1); |
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163 } |
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164 if (cookie_mcsn->res1 != 0) { |
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165 for (i = 1; i < 4; i++) { |
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166 SDL_MintAudio_AddFrequency(this, |
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167 (cookie_mcsn->res1) / |
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168 (MASTERPREDIV_FALCON * |
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169 (1 << i)), CLKEXT, |
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170 (1 << i) - 1, -1); |
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171 } |
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172 } |
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173 this->spec.format |= SDL_AUDIO_MASK_SIGNED; /* Audio is always signed */ |
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174 if ((SDL_AUDIO_BITSIZE(this->spec.format)) == 16) { |
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175 this->spec.format |= SDL_AUDIO_MASK_ENDIAN; /* Audio is always big endian */ |
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176 this->spec.channels = 2; /* 16 bits always stereo */ |
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177 } |
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178 break; |
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179 } |
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180 |
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181 #if 1 |
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182 for (i = 0; i < MINTAUDIO_freqcount; i++) { |
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183 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n", |
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184 i, MINTAUDIO_frequencies[i].frequency, |
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185 MINTAUDIO_frequencies[i].masterclock, |
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186 MINTAUDIO_frequencies[i].predivisor)); |
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187 } |
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188 #endif |
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189 |
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190 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq); |
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191 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; |
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192 |
2043 | 193 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", |
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194 SDL_AUDIO_BITSIZE(this->spec.format))); |
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195 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format))); |
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196 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format))); |
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197 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format))); |
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198 DEBUG_PRINT(("channels=%d, ", this->spec.channels)); |
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199 DEBUG_PRINT(("freq=%d\n", this->spec.freq)); |
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200 |
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201 return 0; |
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202 } |
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203 |
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204 static void |
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205 MINTMCSN_InitAudio(_THIS) |
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206 { |
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207 int channels_mode, prediv, dmaclock; |
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208 void *buffer; |
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209 |
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210 /* Stop currently playing sound */ |
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211 SDL_MintAudio_quit_thread = SDL_FALSE; |
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212 SDL_MintAudio_thread_finished = SDL_TRUE; |
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213 SDL_MintAudio_WaitThread(); |
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214 Buffoper(0); |
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215 |
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216 /* Set replay tracks */ |
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217 Settracks(0, 0); |
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218 Setmontracks(0); |
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219 |
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220 /* Select replay format */ |
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221 channels_mode = STEREO16; |
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222 switch (SDL_AUDIO_BITSIZE(this->spec.format)) { |
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223 case 8: |
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224 if (this->spec.channels == 2) { |
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225 channels_mode = STEREO8; |
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226 } else { |
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227 channels_mode = MONO8; |
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228 } |
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229 break; |
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230 } |
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231 if (Setmode(channels_mode) < 0) { |
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232 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); |
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233 } |
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234 |
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235 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock; |
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236 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; |
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237 switch (cookie_mcsn->play) { |
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238 case MCSN_TT: |
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239 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1); |
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240 Soundcmd(SETPRESCALE, prediv); |
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241 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n")); |
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242 break; |
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243 case MCSN_FALCON: |
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244 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1); |
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245 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n")); |
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246 break; |
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247 } |
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248 |
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249 /* Set buffer */ |
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250 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
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251 if (Setbuffer(0, buffer, buffer + this->spec.size) < 0) { |
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252 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); |
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253 } |
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254 |
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255 if (SDL_MintAudio_mint_present) { |
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256 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0); |
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257 } else { |
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258 /* Install interrupt */ |
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259 Jdisint(MFP_DMASOUND); |
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260 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt); |
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261 Jenabint(MFP_DMASOUND); |
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262 |
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263 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) { |
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264 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n")); |
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265 } |
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266 } |
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267 |
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268 /* Go */ |
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269 Buffoper(SB_PLA_ENA | SB_PLA_RPT); |
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270 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n")); |
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271 } |
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272 |
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273 static int |
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274 MINTMCSN_OpenDevice(_THIS, const char *devname, int iscapture) |
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275 { |
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276 /* Lock sound system */ |
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277 if (Locksnd() != 1) { |
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278 SDL_SetError("MINTMCSN_OpenDevice: Audio system already in use"); |
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279 return 0; |
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280 } |
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281 |
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282 SDL_MintAudio_device = this; |
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283 |
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284 /* Check audio capabilities */ |
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285 if (MINTMCSN_CheckAudio(this) == -1) { |
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286 return 0; |
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287 } |
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288 |
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289 /* Initialize all variables that we clean on shutdown */ |
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290 this->hidden = (struct SDL_PrivateAudioData *) |
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291 SDL_malloc((sizeof *this->hidden)); |
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292 if (this->hidden == NULL) { |
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293 SDL_OutOfMemory(); |
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294 return 0; |
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295 } |
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296 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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297 |
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298 SDL_CalculateAudioSpec(&this->spec); |
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299 |
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300 /* Allocate memory for audio buffers in DMA-able RAM */ |
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301 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size)); |
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302 |
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303 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(this->spec.size * 2, MX_STRAM); |
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304 if (SDL_MintAudio_audiobuf[0] == NULL) { |
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305 SDL_free(this->hidden); |
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306 this->hidden = NULL; |
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307 SDL_OutOfMemory(); |
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308 return 0; |
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309 } |
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310 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size; |
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311 SDL_MintAudio_numbuf = 0; |
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312 SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2); |
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313 SDL_MintAudio_audiosize = this->spec.size; |
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314 SDL_MintAudio_mutex = 0; |
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315 |
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316 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", |
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317 SDL_MintAudio_audiobuf[0])); |
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318 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", |
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319 SDL_MintAudio_audiobuf[1])); |
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320 |
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321 SDL_MintAudio_CheckFpu(); |
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322 |
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323 /* Setup audio hardware */ |
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324 MINTMCSN_InitAudio(this); |
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325 |
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326 return 1; /* good to go. */ |
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327 } |
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328 |
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329 static int |
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330 MINTMCSN_Init(SDL_AudioDriverImpl *impl) |
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331 { |
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332 unsigned long dummy = 0; |
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333 |
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334 SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND); |
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335 |
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336 /* We can't use XBIOS in interrupt with Magic, don't know about thread */ |
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337 if (Getcookie(C_MagX, &dummy) == C_FOUND) { |
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338 return 0; |
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339 } |
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340 |
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341 /* Cookie _MCH present ? if not, assume ST machine */ |
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342 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) { |
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343 cookie_mch = MCH_ST; |
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344 } |
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345 |
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346 /* Cookie _SND present ? if not, assume ST machine */ |
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347 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { |
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348 cookie_snd = SND_PSG; |
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349 } |
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350 |
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351 /* Check if we have 16 bits audio */ |
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352 if ((cookie_snd & SND_16BIT) == 0) { |
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353 SDL_SetError(DEBUG_NAME "no 16-bit sound"); |
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354 return 0; |
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355 } |
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356 |
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357 /* Cookie MCSN present ? */ |
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358 if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) { |
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359 SDL_SetError(DEBUG_NAME "no MCSN audio"); |
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360 return 0; |
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361 } |
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362 |
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363 /* Check if interrupt at end of replay */ |
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364 if (cookie_mcsn->pint == 0) { |
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365 SDL_SetError(DEBUG_NAME "no interrupt at end of replay"); |
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366 return 0; |
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367 } |
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368 |
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369 /* Check if audio is lockable */ |
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370 if (Locksnd() != 1) { |
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371 SDL_SetError(DEBUG_NAME "audio locked by other application"); |
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372 return 0; |
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373 } |
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374 |
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375 Unlocksnd(); |
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376 |
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377 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n")); |
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378 |
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379 /* Set the function pointers */ |
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380 impl->OpenDevice = MINTMCSN_OpenDevice; |
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381 impl->CloseDevice = MINTMCSN_CloseDevice; |
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382 impl->LockAudio = MINTMCSN_LockAudio; |
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383 impl->UnlockAudio = MINTMCSN_UnlockAudio; |
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384 impl->OnlyHasDefaultOutputDevice = 1; |
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385 impl->ProvidesOwnCallbackThread = 1; |
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386 impl->SkipMixerLock = 1; |
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387 |
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388 return 1; |
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389 } |
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390 |
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391 AudioBootStrap MINTAUDIO_MCSN_bootstrap = { |
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392 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver", MINTMCSN_Init, 0 |
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393 }; |
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394 |
1895
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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395 /* vi: set ts=4 sw=4 expandtab: */ |