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annotate src/audio/mint/SDL_mintaudio.c @ 956:4263beff9e38

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Date: Mon, 30 Aug 2004 18:20:25 +0200 From: Joost Baas Subject: why call arts artsc? I, and a few other people at the mplayer-docs-mailinglist were wondering why you decided to call arts artsc. I understand usually users have nothing to do with libsdl, just developers, but because you can choose the audio-driver being used by mplayer, one of which is sdl, and you can also choose the sdl subdriver, it is necessary to have a well-known or logical name. artsc is not the logical choice, and it's very hard to look up the right name if you don't know what you're looking for.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:25:06 +0000
parents b8d311d90021
children 185acc07127a
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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 }