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annotate src/audio/mint/SDL_mintaudio.c @ 885:9f6ad2286011

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Date: Wed, 28 Apr 2004 16:52:41 -0400 From: "Damien A" Subject: testdyngl fix The test program you included in the latest version of SDL crashes on startup in Window (XP). The reason for this is that OpenGL functions on Windows use the __stdcall calling convention, not the C convention. Placing APIENTRY infront of the * operator solves this problem.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 30 Apr 2004 18:33:30 +0000
parents b8d311d90021
children 185acc07127a
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 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 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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42 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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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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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 }