| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Library General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with this library; if not, write to the Free |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* |
| 25 | MiNT audio driver |
| 26 | |
| 27 | Patrice Mandin |
| 28 | */ |
| 29 | |
| 30 | #ifndef _SDL_mintaudio_h |
| 31 | #define _SDL_mintaudio_h |
| 32 | |
| 33 | #include "../SDL_sysaudio.h" |
| 34 | #include "SDL_mintaudio_stfa.h" |
| 35 | |
| 36 | /* Hidden "this" pointer for the audio functions */ |
| 37 | #define _THIS SDL_AudioDevice *this |
| 38 | |
| 39 | /* 16 predivisors with 3 clocks max. */ |
| 40 | #define MINTAUDIO_maxfreqs (16*3) |
| 41 | |
| 42 | typedef struct { |
| 43 | Uint32 frequency; |
| 44 | Uint32 masterclock; |
| 45 | Uint32 predivisor; |
| 46 | int gpio_bits; /* in case of external clock */ |
| 47 | } mint_frequency_t; |
| 48 | |
| 49 | struct SDL_PrivateAudioData { |
| 50 | mint_frequency_t frequencies[MINTAUDIO_maxfreqs]; |
| 51 | int freq_count; /* Number of frequencies in the array */ |
| 52 | int numfreq; /* Number of selected frequency */ |
| 53 | }; |
| 54 | |
| 55 | /* Old variable names */ |
| 56 | |
| 57 | #define MINTAUDIO_frequencies (this->hidden->frequencies) |
| 58 | #define MINTAUDIO_freqcount (this->hidden->freq_count) |
| 59 | #define MINTAUDIO_numfreq (this->hidden->numfreq) |
| 60 | |
| 61 | /* _MCH cookie (values>>16) */ |
| 62 | enum { |
| 63 | MCH_ST=0, |
| 64 | MCH_STE, |
| 65 | MCH_TT, |
| 66 | MCH_F30, |
| 67 | MCH_CLONE, |
| 68 | MCH_ARANYM |
| 69 | }; |
| 70 | |
| 71 | /* Master clocks for replay frequencies */ |
| 72 | #define MASTERCLOCK_STE 8010666 /* Not sure of this one */ |
| 73 | #define MASTERCLOCK_TT 16107953 /* Not sure of this one */ |
| 74 | #define MASTERCLOCK_FALCON1 25175000 |
| 75 | #define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */ |
| 76 | #define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */ |
| 77 | #define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */ |
| 78 | #define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */ |
| 79 | |
| 80 | /* Master clock predivisors */ |
| 81 | #define MASTERPREDIV_STE 160 |
| 82 | #define MASTERPREDIV_TT 320 |
| 83 | #define MASTERPREDIV_FALCON 256 |
| 84 | #define MASTERPREDIV_MILAN 256 |
| 85 | |
| 86 | /* MFP 68901 interrupt sources */ |
| 87 | #ifndef MFP_PARALLEL |
| 88 | enum { |
| 89 | MFP_PARALLEL=0, |
| 90 | MFP_DCD, |
| 91 | MFP_CTS, |
| 92 | MFP_BITBLT, |
| 93 | MFP_TIMERD, |
| 94 | MFP_BAUDRATE=MFP_TIMERD, |
| 95 | MFP_TIMERC, |
| 96 | MFP_200HZ=MFP_TIMERC, |
| 97 | MFP_ACIA, |
| 98 | MFP_DISK, |
| 99 | MFP_TIMERB, |
| 100 | MFP_HBLANK=MFP_TIMERB, |
| 101 | MFP_TERR, |
| 102 | MFP_TBE, |
| 103 | MFP_RERR, |
| 104 | MFP_RBF, |
| 105 | MFP_TIMERA, |
| 106 | MFP_DMASOUND=MFP_TIMERA, |
| 107 | MFP_RING, |
| 108 | MFP_MONODETECT |
| 109 | }; |
| 110 | #endif |
| 111 | |
| 112 | /* Xbtimer() timers */ |
| 113 | #ifndef XB_TIMERA |
| 114 | enum { |
| 115 | XB_TIMERA=0, |
| 116 | XB_TIMERB, |
| 117 | XB_TIMERC, |
| 118 | XB_TIMERD |
| 119 | }; |
| 120 | #endif |
| 121 | |
| 122 | /* Variables */ |
| 123 | extern SDL_AudioDevice *SDL_MintAudio_device; |
| 124 | extern Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */ |
| 125 | extern unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ |
| 126 | extern volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ |
| 127 | extern volatile unsigned short SDL_MintAudio_mutex; |
| 128 | extern cookie_stfa_t *SDL_MintAudio_stfa; |
| 129 | extern volatile unsigned long SDL_MintAudio_clocktics; |
| 130 | extern unsigned short SDL_MintAudio_hasfpu; /* To preserve fpu registers if needed */ |
| 131 | |
| 132 | /* MiNT thread variables */ |
| 133 | extern SDL_bool SDL_MintAudio_mint_present; |
| 134 | extern SDL_bool SDL_MintAudio_quit_thread; |
| 135 | extern SDL_bool SDL_MintAudio_thread_finished; |
| 136 | extern long SDL_MintAudio_thread_pid; |
| 137 | |
| 138 | /* Functions */ |
| 139 | void SDL_MintAudio_Callback(void); |
| 140 | void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, |
| 141 | Uint32 prediv, int gpio_bits); |
| 142 | int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq); |
| 143 | void SDL_MintAudio_CheckFpu(void); |
| 144 | |
| 145 | /* MiNT thread functions */ |
| 146 | int SDL_MintAudio_Thread(long param); |
| 147 | void SDL_MintAudio_WaitThread(void); |
| 148 | |
| 149 | /* ASM interrupt functions */ |
| 150 | void SDL_MintAudio_GsxbInterrupt(void); |
| 151 | void SDL_MintAudio_EmptyGsxbInterrupt(void); |
| 152 | void SDL_MintAudio_XbiosInterruptMeasureClock(void); |
| 153 | void SDL_MintAudio_XbiosInterrupt(void); |
| 154 | void SDL_MintAudio_Dma8Interrupt(void); |
| 155 | void SDL_MintAudio_StfaInterrupt(void); |
| 156 | |
| 157 | #endif /* _SDL_mintaudio_h */ |