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annotate src/audio/mint/SDL_mintaudio.h @ 1107:856f76a099c7

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Can use both clocks of FDI interface on Falcon, plus digital output
author Patrice Mandin <patmandin@gmail.com>
date Sun, 07 Aug 2005 12:17:28 +0000
parents 39b5606fa543
children 12c49532be00
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /*
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24 MiNT audio driver
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25
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26 Patrice Mandin
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27 */
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28
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29 #ifndef _SDL_mintaudio_h
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30 #define _SDL_mintaudio_h
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31
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32 #include "SDL_sysaudio.h"
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33 #include "SDL_mintaudio_stfa.h"
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34
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35 /* Hidden "this" pointer for the audio functions */
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36 #define _THIS SDL_AudioDevice *this
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37
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38 /* 16 predivisors with 3 clocks max. */
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39 #define MINTAUDIO_maxfreqs (16*3)
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40
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41 typedef struct {
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42 Uint32 frequency;
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43 Uint32 masterclock;
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44 Uint32 predivisor;
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45 int gpio_bits; /* in case of external clock */
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46 } mint_frequency_t;
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47
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48 struct SDL_PrivateAudioData {
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49 mint_frequency_t frequencies[MINTAUDIO_maxfreqs];
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50 int freq_count; /* Number of frequencies in the array */
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51 int numfreq; /* Number of selected frequency */
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52 };
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53
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54 /* Old variable names */
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55
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56 #define MINTAUDIO_frequencies (this->hidden->frequencies)
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57 #define MINTAUDIO_freqcount (this->hidden->freq_count)
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58 #define MINTAUDIO_numfreq (this->hidden->numfreq)
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59
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60 /* _MCH cookie (values>>16) */
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61 enum {
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62 MCH_ST=0,
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63 MCH_STE,
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64 MCH_TT,
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65 MCH_F30,
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66 MCH_CLONE,
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67 MCH_ARANYM
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68 };
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69
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70 /* Master clocks for replay frequencies */
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71 #define MASTERCLOCK_STE 8010666 /* Not sure of this one */
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72 #define MASTERCLOCK_TT 16107953 /* Not sure of this one */
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73 #define MASTERCLOCK_FALCON1 25175000
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74 #define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */
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75 #define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */
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76 #define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */
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77 #define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */
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78
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79 /* Master clock predivisors */
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80 #define MASTERPREDIV_STE 160
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81 #define MASTERPREDIV_TT 320
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82 #define MASTERPREDIV_FALCON 256
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83 #define MASTERPREDIV_MILAN 256
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84
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85 /* MFP 68901 interrupt sources */
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86 enum {
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87 MFP_PARALLEL=0,
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88 MFP_DCD,
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89 MFP_CTS,
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90 MFP_BITBLT,
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91 MFP_TIMERD,
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92 MFP_BAUDRATE=MFP_TIMERD,
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93 MFP_TIMERC,
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94 MFP_200HZ=MFP_TIMERC,
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95 MFP_ACIA,
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96 MFP_DISK,
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97 MFP_TIMERB,
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98 MFP_HBLANK=MFP_TIMERB,
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99 MFP_TERR,
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100 MFP_TBE,
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101 MFP_RERR,
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102 MFP_RBF,
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103 MFP_TIMERA,
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104 MFP_DMASOUND=MFP_TIMERA,
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105 MFP_RING,
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106 MFP_MONODETECT
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107 };
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108
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109 /* Xbtimer() timers */
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110 enum {
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111 XB_TIMERA=0,
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112 XB_TIMERB,
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113 XB_TIMERC,
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114 XB_TIMERD
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115 };
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116
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117 /* Variables */
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118 extern SDL_AudioDevice *SDL_MintAudio_device;
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119 extern Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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120 extern unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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121 extern unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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122 extern unsigned short SDL_MintAudio_mutex;
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123 extern cookie_stfa_t *SDL_MintAudio_stfa;
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124 extern unsigned long SDL_MintAudio_clocktics;
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125
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126 /* Functions */
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127 void SDL_MintAudio_Callback(void);
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128 void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
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129 Uint32 prediv, int gpio_bits);
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130 int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq);
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131
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132 /* ASM interrupt functions */
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133 void SDL_MintAudio_GsxbInterrupt(void);
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134 void SDL_MintAudio_EmptyGsxbInterrupt(void);
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135 void SDL_MintAudio_XbiosInterruptMeasureClock(void);
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136 void SDL_MintAudio_XbiosInterrupt(void);
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137 void SDL_MintAudio_Dma8Interrupt(void);
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138 void SDL_MintAudio_StfaInterrupt(void);
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139
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140 #endif /* _SDL_mintaudio_h */