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1 /*
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2 * pwplib SDL (Simple Directmedia Layer) audio "driver"
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3 * (C) Copyright 2010 ccr/TNSP^PWP <ccr@tnsp.org>
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4 *
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5 * This file and other changes are distributed under same
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6 * license as pwplib itself.
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7 */
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8
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9 #include "config.h"
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10
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11 #ifdef DRIVE_SDL
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12
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13 #include <stdio.h>
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14 #include <stdlib.h>
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15 #include <unistd.h>
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16 #include <SDL.h>
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17
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18 #include "pwplib.h"
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19
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20 #define TIMERHZ 72
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21
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22
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23 extern void gb_sound(int, int, int, int);
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24
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25
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26 static void pwp_sdlaudio_fill(void *udata, Uint8 * buf, int len)
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27 {
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28 pwplib.player();
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29 gb_genwave(buf, len);
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30 }
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31
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32 static void pwp_sdlaudio_loopflush(void)
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33 {
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34 /* Dummy */
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35 }
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36
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37 static void pwp_sdlaudio_close(void)
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38 {
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39 SDL_CloseAudio();
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40 }
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41
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42 int pwp_sdlaudio_init()
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43 {
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44 SDL_AudioSpec fmt;
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45
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46 fmt.freq = 44100;
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47 fmt.format = AUDIO_U8;
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48 fmt.channels = 1;
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49 fmt.samples = fmt.freq / TIMERHZ;
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50 fmt.callback = pwp_sdlaudio_fill;
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51
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52 if (SDL_OpenAudio(&fmt, NULL) < 0)
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53 {
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54 pwpwrite("* SDL: Could not get desired audio format.\n");
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55 return 0;
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56 }
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57
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58 pwpwrite("* SDL sound\n");
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59
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60 pwplib.sound = gb_sound;
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61 pwplib.loopflush = pwp_sdlaudio_loopflush;
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62 gb_init(fmt.freq);
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63
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64 SDL_PauseAudio(0);
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65
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66 pwp_regdestr(pwp_sdlaudio_close);
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67
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68 return 1;
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69 }
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70 #endif
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