Mercurial > sdl-ios-xcode

annotate src/timer/epoc/SDL_systimer.cpp @ 3880:74e828c64315 SDL-1.2

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:45:37 +0000
parents 92947e3a18db
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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 #include "SDL_config.h"
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23
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24 #ifdef SDL_TIMER_EPOC
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25
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26 /*
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27 SDL_systimer.cpp
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28
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29 Epoc version by Hannu Viitala (hannu.j.viitala@mbnet.fi)
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30 */
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31
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32 #include <e32std.h>
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33 #include <e32hal.h>
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34
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35 extern "C" {
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36 #include "SDL_error.h"
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37 #include "SDL_thread.h"
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38 #include "SDL_timer.h"
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39 #include "../SDL_timer_c.h"
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40
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41 static TUint start = 0;
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42 static TInt tickPeriodMilliSeconds;
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43
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44
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45 void SDL_StartTicks(void)
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46 {
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47 /* Set first ticks value */
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48 start = User::TickCount();
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49
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50 TTimeIntervalMicroSeconds32 period;
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51 TInt tmp = UserHal::TickPeriod(period);
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52 tickPeriodMilliSeconds = period.Int() / 1000;
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53 }
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54
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55 Uint32 SDL_GetTicks(void)
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56 {
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57 TUint deltaTics = User::TickCount() - start;
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58 return(deltaTics * tickPeriodMilliSeconds);
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59 }
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60
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61 void SDL_Delay(Uint32 ms)
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62 {
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63
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64 User::After(TTimeIntervalMicroSeconds32(ms*1000));
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65 }
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66
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67 /* Data to handle a single periodic alarm */
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68 static int timer_alive = 0;
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69 static SDL_Thread *timer = NULL;
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70
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71 static int RunTimer(void *unused)
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72 {
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73 Uint32 ms;
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74
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75 while ( timer_alive ) {
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76 if ( SDL_timer_running ) {
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77 SDL_ThreadedTimerCheck();
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78 }
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79 SDL_Delay(10);
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80 }
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81 return(0);
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82 }
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83
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84 /* This is only called if the event thread is not running */
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85 int SDL_SYS_TimerInit(void)
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86 {
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87 timer_alive = 1;
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88 timer = SDL_CreateThread(RunTimer, NULL);
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89 if ( timer == NULL )
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90 return(-1);
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91 return(SDL_SetTimerThreaded(1));
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92 }
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93
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94 void SDL_SYS_TimerQuit(void)
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95 {
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96 timer_alive = 0;
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97 if ( timer ) {
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98 SDL_WaitThread(timer, NULL);
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99 timer = NULL;
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100 }
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101 }
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102
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103 int SDL_SYS_StartTimer(void)
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104 {
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105 SDL_SetError("Internal logic error: Epoc uses threaded timer");
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106 return(-1);
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107 }
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108
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109 void SDL_SYS_StopTimer(void)
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110 {
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111 return;
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112 }
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113
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114 }; // extern "C"
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115
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116 #endif /* SDL_TIMER_EPOC */