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annotate src/audio/mint/SDL_mintaudio.c @ 644:594422ab8f9f

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Atari MiNT: added more audio drivers
author Patrice Mandin <patmandin@gmail.com>
date Mon, 07 Jul 2003 19:16:03 +0000
parents 0ce5a68278fd
children c4803992e09c
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, 1998, 1999, 2000, 2001, 2002 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 */
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41 long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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42 long SDL_MintAudio_numbuf; /* Buffer to play */
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43 long 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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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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91 /* Not in the array, give the latest */
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92 return MINTAUDIO_nfreq-1;
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93 }