Mercurial > sdl-ios-xcode
annotate src/audio/mint/SDL_mintaudio.c @ 937:1e6366bde299
Date: Tue, 27 Jul 2004 17:14:00 +0200
From: "Eckhard Stolberg"
Subject: Controller names in SDL for Windows
I'm working on an Atari 2600 emulator for different systems that uses
the SDL. Some time ago someone created an adaptor that lets you use
your old Atari controllers with your computer through the USB port.
Some of the Atari controllers require special handling by the emulator,
so it would be nice, if it would be possible to detect if any of the
controllers connected to the computer is this adaptor.
SDL would allow that with the SDL_JoystickName function, but unfortunately
it doesn't work properly on Windows. On Linux and MacOSX this function
returns the name of the controller, but on Windows you'll only get the
name of the joystick driver. Most joysticks nowadays use the generic
Microsoft driver, so they all return the same name.
In an old MSDN article
(http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarinput/html/msdn_extdirect.asp)
Microsoft describes how to read out the OEM controller names from the registry.
I have implemented this for the SDL controller handler on Windows,
and now reading the joystick name works properly there too.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Aug 2004 03:45:58 +0000 |
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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 Audio interrupt variables and callback function |
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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 #include <string.h> |
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30 |
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31 #include "SDL_types.h" |
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32 #include "SDL_audio.h" |
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33 |
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34 #include "SDL_mintaudio.h" |
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35 #include "SDL_mintaudio_stfa.h" |
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36 |
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37 /* The audio device */ |
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38 |
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39 SDL_AudioDevice *SDL_MintAudio_device; |
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40 Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */ |
704 | 41 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ |
42 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ | |
43 unsigned short SDL_MintAudio_mutex; | |
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44 cookie_stfa_t *SDL_MintAudio_stfa; |
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45 |
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46 /* The callback function, called by each driver whenever needed */ |
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47 |
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48 void SDL_MintAudio_Callback(void) |
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49 { |
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50 Uint8 *buffer; |
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51 |
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52 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
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53 memset(buffer, SDL_MintAudio_device->spec.silence, SDL_MintAudio_device->spec.size); |
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54 |
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55 if ( ! SDL_MintAudio_device->paused ) { |
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56 if ( SDL_MintAudio_device->convert.needed ) { |
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57 SDL_MintAudio_device->spec.callback(SDL_MintAudio_device->spec.userdata, |
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58 (Uint8 *)SDL_MintAudio_device->convert.buf,SDL_MintAudio_device->convert.len); |
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59 SDL_ConvertAudio(&SDL_MintAudio_device->convert); |
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60 memcpy(buffer, SDL_MintAudio_device->convert.buf, SDL_MintAudio_device->convert.len_cvt); |
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61 } else { |
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62 SDL_MintAudio_device->spec.callback(SDL_MintAudio_device->spec.userdata, buffer, SDL_MintAudio_device->spec.size); |
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63 } |
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64 } |
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65 } |
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66 |
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67 /* Simple function to search for the nearest frequency */ |
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68 int SDL_MintAudio_SearchFrequency(_THIS, int falcon_codec, int desired_freq) |
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69 { |
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70 int i; |
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71 |
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72 /* Only 1 freq ? */ |
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73 if (MINTAUDIO_nfreq==1) { |
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74 return(MINTAUDIO_sfreq); |
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75 } |
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76 |
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77 /* Check the array */ |
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78 for (i=MINTAUDIO_sfreq; i<MINTAUDIO_nfreq-1; i++) { |
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79 /* Remove unusable falcon codec frequencies */ |
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80 if (falcon_codec) { |
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81 if ((i==6) || (i==8) || (i==10)) { |
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82 continue; |
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83 } |
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84 } |
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85 |
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86 if (desired_freq >= ((MINTAUDIO_hardfreq[i]+MINTAUDIO_hardfreq[i+1])>>1)) { |
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87 return i; |
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88 } |
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89 } |
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90 |
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91 /* Not in the array, give the latest */ |
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92 return MINTAUDIO_nfreq-1; |
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93 } |