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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 |
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27 Patrice Mandin |
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28 */ |
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29 |
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30 #ifndef _SDL_mintaudio_h |
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31 #define _SDL_mintaudio_h |
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32 |
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33 #include "../SDL_sysaudio.h" |
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34 #include "SDL_mintaudio_stfa.h" |
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35 |
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36 /* Hidden "this" pointer for the audio functions */ |
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37 #define _THIS SDL_AudioDevice *this |
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38 |
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39 /* 16 predivisors with 3 clocks max. */ |
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40 #define MINTAUDIO_maxfreqs (16*3) |
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41 |
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42 typedef struct { |
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43 Uint32 frequency; |
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44 Uint32 masterclock; |
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45 Uint32 predivisor; |
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46 int gpio_bits; /* in case of external clock */ |
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47 } mint_frequency_t; |
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48 |
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49 struct SDL_PrivateAudioData { |
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50 mint_frequency_t frequencies[MINTAUDIO_maxfreqs]; |
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51 int freq_count; /* Number of frequencies in the array */ |
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52 int numfreq; /* Number of selected frequency */ |
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53 }; |
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54 |
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55 /* Old variable names */ |
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56 |
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57 #define MINTAUDIO_frequencies (this->hidden->frequencies) |
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58 #define MINTAUDIO_freqcount (this->hidden->freq_count) |
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59 #define MINTAUDIO_numfreq (this->hidden->numfreq) |
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60 |
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61 /* _MCH cookie (values>>16) */ |
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62 enum { |
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63 MCH_ST=0, |
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64 MCH_STE, |
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65 MCH_TT, |
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66 MCH_F30, |
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67 MCH_CLONE, |
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68 MCH_ARANYM |
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69 }; |
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70 |
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71 /* Master clocks for replay frequencies */ |
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72 #define MASTERCLOCK_STE 8010666 /* Not sure of this one */ |
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73 #define MASTERCLOCK_TT 16107953 /* Not sure of this one */ |
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74 #define MASTERCLOCK_FALCON1 25175000 |
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75 #define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */ |
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76 #define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */ |
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77 #define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */ |
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78 #define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */ |
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79 |
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80 /* Master clock predivisors */ |
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81 #define MASTERPREDIV_STE 160 |
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82 #define MASTERPREDIV_TT 320 |
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83 #define MASTERPREDIV_FALCON 256 |
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84 #define MASTERPREDIV_MILAN 256 |
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85 |
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86 /* MFP 68901 interrupt sources */ |
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87 enum { |
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88 MFP_PARALLEL=0, |
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89 MFP_DCD, |
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90 MFP_CTS, |
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91 MFP_BITBLT, |
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92 MFP_TIMERD, |
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93 MFP_BAUDRATE=MFP_TIMERD, |
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94 MFP_TIMERC, |
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95 MFP_200HZ=MFP_TIMERC, |
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96 MFP_ACIA, |
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97 MFP_DISK, |
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98 MFP_TIMERB, |
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99 MFP_HBLANK=MFP_TIMERB, |
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100 MFP_TERR, |
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101 MFP_TBE, |
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102 MFP_RERR, |
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103 MFP_RBF, |
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104 MFP_TIMERA, |
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105 MFP_DMASOUND=MFP_TIMERA, |
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106 MFP_RING, |
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107 MFP_MONODETECT |
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108 }; |
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109 |
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110 /* Xbtimer() timers */ |
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111 enum { |
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112 XB_TIMERA=0, |
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113 XB_TIMERB, |
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114 XB_TIMERC, |
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115 XB_TIMERD |
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116 }; |
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117 |
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118 /* Variables */ |
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119 extern SDL_AudioDevice *SDL_MintAudio_device; |
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120 extern Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */ |
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121 extern unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ |
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122 extern volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ |
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123 extern volatile unsigned short SDL_MintAudio_mutex; |
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124 extern cookie_stfa_t *SDL_MintAudio_stfa; |
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125 extern volatile unsigned long SDL_MintAudio_clocktics; |
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126 extern unsigned short SDL_MintAudio_hasfpu; /* To preserve fpu registers if needed */ |
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127 |
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128 /* MiNT thread variables */ |
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129 extern SDL_bool SDL_MintAudio_mint_present; |
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130 extern SDL_bool SDL_MintAudio_quit_thread; |
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131 extern SDL_bool SDL_MintAudio_thread_finished; |
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132 extern long SDL_MintAudio_thread_pid; |
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133 |
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134 /* Functions */ |
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135 void SDL_MintAudio_Callback(void); |
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136 void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, |
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137 Uint32 prediv, int gpio_bits); |
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138 int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq); |
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139 void SDL_MintAudio_CheckFpu(void); |
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140 |
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141 /* MiNT thread functions */ |
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142 int SDL_MintAudio_Thread(long param); |
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143 void SDL_MintAudio_WaitThread(void); |
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144 |
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145 /* ASM interrupt functions */ |
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146 void SDL_MintAudio_GsxbInterrupt(void); |
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147 void SDL_MintAudio_EmptyGsxbInterrupt(void); |
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148 void SDL_MintAudio_XbiosInterruptMeasureClock(void); |
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149 void SDL_MintAudio_XbiosInterrupt(void); |
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150 void SDL_MintAudio_Dma8Interrupt(void); |
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151 void SDL_MintAudio_StfaInterrupt(void); |
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152 |
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153 #endif /* _SDL_mintaudio_h */ |