Mercurial > sdl-ios-xcode
annotate src/audio/mint/SDL_mintaudio_xbios.c @ 2866:e532417a6977
Fixed SDL 1.2 compatibility problem.
The API specifies that SDL_OpenAudio() will fill out the 'desired' audio spec
with the correct samples and size set by the driver. This value is important
since it may be used by applications that size audio buffers, etc.
However, we want to allow advanced applications to call SDL_OpenAudioDevice()
which gets passed a const 'desired' parameter, and have the correct data filled
into the 'obtained' parameter, possibly allowing or not allowing format changes.
So... 'obtained' becomes the audio format the user callback is expected to use,
and we add flags to allow the application to specify which format changes are
allowed.
Note: We really need to add a way to query the 'obtained' audio spec.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 13 Dec 2008 06:36:47 +0000 |
parents | 99210400e8b9 |
children | 2929ed239d2a |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 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 (Falcon) |
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27 |
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28 Patrice Mandin, Didier Méquignon |
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29 */ |
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30 |
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31 #include <unistd.h> |
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32 #include <support.h> |
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33 |
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34 /* Mint includes */ |
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35 #include <mint/osbind.h> |
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36 #include <mint/falcon.h> |
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37 #include <mint/cookie.h> |
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38 |
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39 #include "SDL_audio.h" |
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40 #include "../SDL_audio_c.h" |
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41 #include "../SDL_sysaudio.h" |
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42 |
1412 | 43 #include "../../video/ataricommon/SDL_atarimxalloc_c.h" |
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44 |
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45 #include "SDL_mintaudio.h" |
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46 #include "SDL_mintaudio_dma8.h" |
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47 |
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48 /*--- Defines ---*/ |
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49 |
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50 #define MINT_AUDIO_DRIVER_NAME "mint_xbios" |
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51 |
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52 /* Debug print info */ |
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53 #define DEBUG_NAME "audio:xbios: " |
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54 #if 0 |
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55 #define DEBUG_PRINT(what) \ |
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56 { \ |
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57 printf what; \ |
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58 } |
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59 #else |
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60 #define DEBUG_PRINT(what) |
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61 #endif |
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62 |
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63 static unsigned long cookie_snd = 0; |
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64 |
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65 static void |
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66 MINTXBIOS_LockDevice(_THIS) |
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67 { |
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68 /* Stop replay */ |
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69 Buffoper(0); |
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70 } |
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71 |
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72 static void |
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73 MINTXBIOS_UnlockDevice(_THIS) |
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74 { |
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75 /* Restart replay */ |
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76 Buffoper(SB_PLA_ENA | SB_PLA_RPT); |
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77 } |
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78 |
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79 static void |
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80 MINTXBIOS_CloseDevice(_THIS) |
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81 { |
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82 if (this->hidden != NULL) { |
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83 /* Stop replay */ |
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84 SDL_MintAudio_WaitThread(); |
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85 Buffoper(0); |
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86 |
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87 if (!SDL_MintAudio_mint_present) { |
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88 /* Uninstall interrupt */ |
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89 Jdisint(MFP_DMASOUND); |
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90 } |
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91 |
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92 /* Wait if currently playing sound */ |
2060 | 93 while (SDL_MintAudio_mutex != 0) { |
94 } | |
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95 |
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96 /* Clear buffers */ |
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97 if (SDL_MintAudio_audiobuf[0]) { |
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98 Mfree(SDL_MintAudio_audiobuf[0]); |
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99 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
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100 } |
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101 |
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102 /* Unlock sound system */ |
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103 Unlocksnd(); |
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104 |
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105 SDL_free(this->hidden); |
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106 this->hidden = NULL; |
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107 } |
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108 } |
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109 |
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110 /* Falcon XBIOS implementation of Devconnect() is buggy with external clock */ |
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111 static void |
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112 Devconnect2(int src, int dst, int sclk, int pre) |
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113 { |
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114 static const unsigned short MASK1[3] = { 0, 0x6000, 0 }; |
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115 static const unsigned short MASK2[4] = { 0xFFF0, 0xFF8F, 0xF0FF, 0x0FFF }; |
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116 static const unsigned short INDEX1[4] = { 1, 3, 5, 7 }; |
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117 static const unsigned short INDEX2[4] = { 0, 2, 4, 6 }; |
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118 unsigned short sync_div, dev_ctrl, dest_ctrl; |
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119 void *oldstack; |
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120 |
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121 if (dst == 0) { |
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122 return; |
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123 } |
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124 |
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125 oldstack = (void *) Super(0); |
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126 |
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127 dev_ctrl = DMAAUDIO_IO.dev_ctrl; |
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128 dest_ctrl = DMAAUDIO_IO.dest_ctrl; |
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129 dev_ctrl &= MASK2[src]; |
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130 |
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131 if (src == ADC) { |
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132 dev_ctrl |= MASK1[sclk]; |
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133 } else { |
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134 dev_ctrl |= (INDEX1[sclk] << (src << 4)); |
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135 } |
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136 |
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137 if (dst & DMAREC) { |
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138 dest_ctrl &= 0xFFF0; |
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139 dest_ctrl |= INDEX1[src]; |
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140 } |
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141 |
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142 if (dst & DSPRECV) { |
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143 dest_ctrl &= 0xFF8F; |
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144 dest_ctrl |= (INDEX1[src] << 4); |
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145 } |
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146 |
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147 if (dst & EXTOUT) { |
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148 dest_ctrl &= 0xF0FF; |
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149 dest_ctrl |= (INDEX1[src] << 8); |
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150 } |
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151 |
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152 if (dst & DAC) { |
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153 dev_ctrl &= 0x0FFF; |
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154 dev_ctrl |= MASK1[sclk]; |
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155 dest_ctrl &= 0x0FFF; |
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156 dest_ctrl |= (INDEX2[src] << 12); |
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157 } |
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158 |
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159 sync_div = DMAAUDIO_IO.sync_div; |
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160 if (sclk == CLKEXT) { |
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161 pre <<= 8; |
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162 sync_div &= 0xF0FF; |
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163 } else { |
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164 sync_div &= 0xFFF0; |
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165 } |
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166 sync_div |= pre; |
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167 |
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168 DMAAUDIO_IO.dev_ctrl = dev_ctrl; |
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169 DMAAUDIO_IO.dest_ctrl = dest_ctrl; |
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170 DMAAUDIO_IO.sync_div = sync_div; |
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171 |
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172 Super(oldstack); |
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173 } |
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174 |
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175 static void |
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176 MINTXBIOS_CheckExternalClock(_THIS) |
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177 { |
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178 #define SIZE_BUF_CLOCK_MEASURE (44100/10) |
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179 |
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180 unsigned long cookie_snd; |
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181 char *buffer; |
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182 int i, j; |
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183 |
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184 /* DSP present with its GPIO port ? */ |
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185 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { |
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186 return; |
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187 } |
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188 if ((cookie_snd & SND_DSP) == 0) { |
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189 return; |
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190 } |
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191 |
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192 buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM); |
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193 if (buffer == NULL) { |
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194 DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n")); |
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195 return; |
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196 } |
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197 SDL_memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE); |
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198 |
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199 Buffoper(0); |
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200 Settracks(0, 0); |
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201 Setmontracks(0); |
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202 Setmode(MONO8); |
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203 Jdisint(MFP_TIMERA); |
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204 |
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205 for (i = 0; i < 2; i++) { |
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206 Gpio(GPIO_SET, 7); /* DSP port gpio outputs */ |
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207 Gpio(GPIO_WRITE, 2 + i); /* 22.5792/24.576 MHz for 44.1/48KHz */ |
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208 Devconnect2(DMAPLAY, DAC, CLKEXT, CLK50K); /* Matrix and clock source */ |
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209 Setbuffer(0, buffer, buffer + SIZE_BUF_CLOCK_MEASURE); /* Set buffer */ |
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210 Xbtimer(XB_TIMERA, 5, 38, SDL_MintAudio_XbiosInterruptMeasureClock); /* delay mode timer A, prediv /64, 1KHz */ |
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211 Jenabint(MFP_TIMERA); |
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212 SDL_MintAudio_clocktics = 0; |
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213 Buffoper(SB_PLA_ENA); |
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214 usleep(110000); |
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215 |
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216 if ((Buffoper(-1) & 1) == 0) { |
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217 if (SDL_MintAudio_clocktics) { |
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218 unsigned long khz; |
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219 |
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220 khz = |
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221 ((SIZE_BUF_CLOCK_MEASURE / |
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222 SDL_MintAudio_clocktics) + 1) & 0xFFFFFFFE; |
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223 DEBUG_PRINT((DEBUG_NAME "measure %d: freq=%lu KHz\n", |
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224 i + 1, khz)); |
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225 |
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226 if (khz == 44) { |
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227 for (j = 1; j < 4; j++) { |
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228 SDL_MintAudio_AddFrequency(this, |
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229 MASTERCLOCK_44K |
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230 / |
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231 (MASTERPREDIV_FALCON |
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232 * (1 << j)), |
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233 MASTERCLOCK_44K, |
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234 (1 << j) - 1, 2 + i); |
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235 } |
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236 } else if (khz == 48) { |
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237 for (j = 1; j < 4; j++) { |
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238 SDL_MintAudio_AddFrequency(this, |
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239 MASTERCLOCK_48K |
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240 / |
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241 (MASTERPREDIV_FALCON |
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242 * (1 << j)), |
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243 MASTERCLOCK_48K, |
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244 (1 << j) - 1, 2 + i); |
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245 } |
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246 } |
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247 } else { |
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248 DEBUG_PRINT((DEBUG_NAME "No measure\n")); |
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249 } |
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250 } else { |
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251 DEBUG_PRINT((DEBUG_NAME "No SDMA clock\n")); |
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252 } |
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253 |
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254 Buffoper(0); /* stop */ |
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255 Jdisint(MFP_TIMERA); /* Uninstall interrupt */ |
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256 } |
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257 |
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258 Mfree(buffer); |
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259 } |
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260 |
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261 static int |
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262 MINTXBIOS_CheckAudio(_THIS) |
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263 { |
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264 int i; |
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265 Uint32 extclock; |
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266 |
2043 | 267 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", |
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268 SDL_AUDIO_BITSIZE(this->spec.format))); |
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269 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format))); |
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270 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format))); |
2060 | 271 DEBUG_PRINT(("big endian=%d, ", |
272 SDL_AUDIO_ISBIGENDIAN(this->spec.format))); | |
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273 DEBUG_PRINT(("channels=%d, ", this->spec.channels)); |
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274 DEBUG_PRINT(("freq=%d\n", this->spec.freq)); |
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275 |
2060 | 276 this->spec.format |= SDL_AUDIO_MASK_SIGNED; /* Audio is always signed */ |
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277 |
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278 /* clamp out int32/float32 */ |
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279 if (SDL_AUDIO_BITSIZE(this->spec.format) >= 16) { |
2060 | 280 this->spec.format = AUDIO_S16MSB; /* Audio is always big endian */ |
281 this->spec.channels = 2; /* 16 bits always stereo */ | |
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282 } else if (this->spec.channels > 2) { |
2060 | 283 this->spec.channels = 2; /* no more than stereo! */ |
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284 } |
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285 |
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286 MINTAUDIO_freqcount = 0; |
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287 |
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288 /* Add external clocks if present */ |
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289 MINTXBIOS_CheckExternalClock(this); |
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290 |
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291 /* Standard clocks */ |
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292 for (i = 1; i < 12; i++) { |
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293 /* Remove unusable Falcon codec predivisors */ |
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294 if ((i == 6) || (i == 8) || (i == 10)) { |
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295 continue; |
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296 } |
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297 SDL_MintAudio_AddFrequency(this, |
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298 MASTERCLOCK_FALCON1 / |
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299 (MASTERPREDIV_FALCON * (i + 1)), |
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300 MASTERCLOCK_FALCON1, i, -1); |
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301 } |
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302 |
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303 #if 1 |
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304 for (i = 0; i < MINTAUDIO_freqcount; i++) { |
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305 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n", |
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306 i, MINTAUDIO_frequencies[i].frequency, |
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307 MINTAUDIO_frequencies[i].masterclock, |
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308 MINTAUDIO_frequencies[i].predivisor)); |
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309 } |
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310 #endif |
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311 |
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312 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq); |
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313 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; |
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314 |
2043 | 315 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", |
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316 SDL_AUDIO_BITSIZE(this->spec.format))); |
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317 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format))); |
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318 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format))); |
2060 | 319 DEBUG_PRINT(("big endian=%d, ", |
320 SDL_AUDIO_ISBIGENDIAN(this->spec.format))); | |
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321 DEBUG_PRINT(("channels=%d, ", this->spec.channels)); |
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322 DEBUG_PRINT(("freq=%d\n", this->spec.freq)); |
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323 |
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324 return 0; |
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325 } |
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326 |
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327 static void |
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328 MINTXBIOS_InitAudio(_THIS) |
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329 { |
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330 int channels_mode, dmaclock, prediv; |
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331 void *buffer; |
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332 |
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333 /* Stop currently playing sound */ |
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334 SDL_MintAudio_quit_thread = SDL_FALSE; |
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335 SDL_MintAudio_thread_finished = SDL_TRUE; |
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336 SDL_MintAudio_WaitThread(); |
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337 Buffoper(0); |
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338 |
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339 /* Set replay tracks */ |
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340 Settracks(0, 0); |
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341 Setmontracks(0); |
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342 |
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343 /* Select replay format */ |
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344 channels_mode = STEREO16; |
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345 switch (SDL_AUDIO_BITSIZE(this->spec.format)) { |
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346 case 8: |
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347 if (this->spec.channels == 2) { |
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348 channels_mode = STEREO8; |
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349 } else { |
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350 channels_mode = MONO8; |
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351 } |
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352 break; |
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353 } |
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354 if (Setmode(channels_mode) < 0) { |
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355 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); |
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356 } |
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357 |
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358 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock; |
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359 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; |
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360 if (MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits != -1) { |
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361 Gpio(GPIO_SET, 7); /* DSP port gpio outputs */ |
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362 Gpio(GPIO_WRITE, MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits); |
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363 Devconnect2(DMAPLAY, DAC | EXTOUT, CLKEXT, prediv); |
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364 } else { |
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365 Devconnect2(DMAPLAY, DAC, CLK25M, prediv); |
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366 } |
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367 |
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368 /* Set buffer */ |
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369 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
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370 if (Setbuffer(0, buffer, buffer + this->spec.size) < 0) { |
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371 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); |
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372 } |
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373 |
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374 if (SDL_MintAudio_mint_present) { |
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375 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0); |
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376 } else { |
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377 /* Install interrupt */ |
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378 Jdisint(MFP_DMASOUND); |
2043 | 379 /*Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt); */ |
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380 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt); |
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381 Jenabint(MFP_DMASOUND); |
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382 |
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383 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) { |
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384 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n")); |
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385 } |
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386 } |
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387 |
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388 /* Go */ |
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389 Buffoper(SB_PLA_ENA | SB_PLA_RPT); |
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390 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n")); |
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391 } |
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392 |
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393 static int |
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394 MINTXBIOS_OpenDevice(_THIS, const char *devname, int iscapture) |
644
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395 { |
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396 /* Lock sound system */ |
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397 if (Locksnd() != 1) { |
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398 SDL_SetError("MINTXBIOS_OpenAudio: Audio system already in use"); |
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399 return 0; |
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400 } |
644
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401 |
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402 SDL_MintAudio_device = this; |
644
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403 |
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|
404 /* Check audio capabilities */ |
2049
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405 if (MINTXBIOS_CheckAudio(this) == -1) { |
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|
406 return 0; |
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|
407 } |
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408 |
2049
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|
409 /* Initialize all variables that we clean on shutdown */ |
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|
410 this->hidden = (struct SDL_PrivateAudioData *) |
2060 | 411 SDL_malloc((sizeof *this->hidden)); |
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412 if (this->hidden == NULL) { |
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|
413 SDL_OutOfMemory(); |
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414 return 0; |
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415 } |
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|
416 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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417 |
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418 SDL_CalculateAudioSpec(&this->spec); |
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419 |
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|
420 /* Allocate memory for audio buffers in DMA-able RAM */ |
2049
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|
421 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size)); |
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|
422 |
2060 | 423 SDL_MintAudio_audiobuf[0] = |
424 Atari_SysMalloc(this->spec.size * 2, MX_STRAM); | |
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|
425 if (SDL_MintAudio_audiobuf[0] == NULL) { |
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|
426 SDL_free(this->hidden); |
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|
427 this->hidden = NULL; |
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|
428 SDL_OutOfMemory(); |
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429 return 0; |
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430 } |
2049
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|
431 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size; |
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432 SDL_MintAudio_numbuf = 0; |
2060 | 433 SDL_memset(SDL_MintAudio_audiobuf[0], this->spec.silence, |
434 this->spec.size * 2); | |
2049
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|
435 SDL_MintAudio_audiosize = this->spec.size; |
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436 SDL_MintAudio_mutex = 0; |
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437 |
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438 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", |
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439 SDL_MintAudio_audiobuf[0])); |
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440 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", |
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|
441 SDL_MintAudio_audiobuf[1])); |
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442 |
2027
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Save/restore FPU registers in interrupt
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|
443 SDL_MintAudio_CheckFpu(); |
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444 |
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445 /* Setup audio hardware */ |
2049
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|
446 MINTXBIOS_InitAudio(this); |
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447 |
2060 | 448 return 1; /* good to go. */ |
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449 } |
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450 |
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|
451 static int |
2060 | 452 MINTXBIOS_Init(SDL_AudioDriverImpl * impl) |
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453 { |
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454 unsigned long dummy = 0; |
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455 /*SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND); */ |
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456 SDL_MintAudio_mint_present = SDL_FALSE; |
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457 |
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458 /* We can't use XBIOS in interrupt with Magic, don't know about thread */ |
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459 if (Getcookie(C_MagX, &dummy) == C_FOUND) { |
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460 return (0); |
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461 } |
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462 |
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463 /* Cookie _SND present ? if not, assume ST machine */ |
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464 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { |
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465 cookie_snd = SND_PSG; |
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466 } |
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467 |
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468 /* Check if we have 16 bits audio */ |
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469 if ((cookie_snd & SND_16BIT) == 0) { |
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470 SDL_SetError(DEBUG_NAME "no 16-bit sound"); |
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471 return (0); |
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472 } |
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473 |
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474 /* Check if audio is lockable */ |
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475 if (Locksnd() != 1) { |
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476 SDL_SetError(DEBUG_NAME "audio locked by other application"); |
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477 return (0); |
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478 } |
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479 |
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480 Unlocksnd(); |
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481 |
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482 DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n")); |
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483 |
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484 /* Set the function pointers */ |
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485 impl->OpenDevice = MINTXBIOS_OpenDevice; |
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486 impl->CloseDevice = MINTXBIOS_CloseDevice; |
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487 impl->LockDevice = MINTXBIOS_LockDevice; |
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488 impl->UnlockDevice = MINTXBIOS_UnlockDevice; |
2049
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489 impl->OnlyHasDefaultOutputDevice = 1; |
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490 impl->ProvidesOwnCallbackThread = 1; |
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491 impl->SkipMixerLock = 1; |
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492 |
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493 return 1; |
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494 } |
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495 |
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496 AudioBootStrap MINTAUDIO_XBIOS_bootstrap = { |
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497 MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver", MINTXBIOS_Init, 0 |
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498 }; |
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499 |
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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500 /* vi: set ts=4 sw=4 expandtab: */ |