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annotate test/testmultiaudio.c @ 2318:0c653886cce7

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HandleEvent() returns done each time it is called. If done was set to 0 the program should quit, but because done is not checked until *all* events are handled a following event can reset done to 1 and prevent the program from terminating when told to. I fixed the while loop that handles events to check for the state of done after handling each event. That could leave some events unhandled when the program exits, but it ensures that the program will exit.
author Bob Pendleton <bob@pendleton.com>
date Wed, 20 Feb 2008 23:27:33 +0000
parents 9fcde304c7b6
children eec7adc3d1c5
rev   line source
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1 #include "SDL.h"
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2
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3 static SDL_AudioSpec spec;
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4 static Uint8 *sound = NULL; /* Pointer to wave data */
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5 static Uint32 soundlen = 0; /* Length of wave data */
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6
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7 typedef struct
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8 {
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9 SDL_AudioDeviceID dev;
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10 int soundpos;
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11 volatile int done;
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12 } callback_data;
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13
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14 void SDLCALL
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15 play_through_once(void *arg, Uint8 * stream, int len)
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16 {
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17 callback_data *cbd = (callback_data *) arg;
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18 Uint8 *waveptr = sound + cbd->soundpos;
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19 int waveleft = soundlen - cbd->soundpos;
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20 int cpy = len;
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21 if (cpy > waveleft)
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22 cpy = waveleft;
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23
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24 SDL_memcpy(stream, waveptr, cpy);
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25 len -= cpy;
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26 cbd->soundpos += cpy;
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27 if (len > 0) {
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28 stream += cpy;
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29 SDL_memset(stream, spec.silence, len);
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30 cbd->done++;
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31 }
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32 }
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33
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34 static void
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35 test_multi_audio(int devcount)
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36 {
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37 callback_data cbd[64];
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38 int keep_going = 1;
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39 int i;
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40
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41 if (devcount > 64) {
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42 fprintf(stderr, "Too many devices (%d), clamping to 64...\n",
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43 devcount);
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44 devcount = 64;
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45 }
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46
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47 spec.callback = play_through_once;
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48
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49 for (i = 0; i < devcount; i++) {
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50 const char *devname = SDL_GetAudioDeviceName(i, 0);
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51 printf("playing on device #%d: ('%s')...", i, devname);
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52 fflush(stdout);
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53
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54 SDL_memset(&cbd[0], '\0', sizeof(callback_data));
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55 spec.userdata = &cbd[0];
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56 cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL);
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57 if (cbd[0].dev == 0) {
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58 printf("Open device failed: %s\n", SDL_GetError());
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59 } else {
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60 SDL_PauseAudioDevice(cbd[0].dev, 0);
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61 while (!cbd[0].done)
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62 SDL_Delay(100);
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63 SDL_PauseAudioDevice(cbd[0].dev, 1);
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64 printf("done.\n");
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65 SDL_CloseAudioDevice(cbd[0].dev);
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66 }
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67 }
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68
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69 SDL_memset(cbd, '\0', sizeof(cbd));
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70
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71 printf("playing on all devices...\n");
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72 for (i = 0; i < devcount; i++) {
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73 const char *devname = SDL_GetAudioDeviceName(i, 0);
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74 spec.userdata = &cbd[i];
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75 cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL);
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76 if (cbd[i].dev == 0) {
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77 printf("Open device %d failed: %s\n", i, SDL_GetError());
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78 }
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79 }
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80
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81 for (i = 0; i < devcount; i++) {
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82 if (cbd[i].dev) {
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83 SDL_PauseAudioDevice(cbd[i].dev, 0);
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84 }
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85 }
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86
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87 while (keep_going) {
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88 keep_going = 0;
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89 for (i = 0; i < devcount; i++) {
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90 if ((cbd[i].dev) && (!cbd[i].done)) {
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91 keep_going = 1;
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92 }
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93 }
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94 SDL_Delay(100);
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95 }
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96
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97 for (i = 0; i < devcount; i++) {
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98 if (cbd[i].dev) {
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99 SDL_PauseAudioDevice(cbd[i].dev, 1);
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100 SDL_CloseAudioDevice(cbd[i].dev);
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101 }
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102 }
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103
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104 printf("All done!\n");
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105 }
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106
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107
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108 int
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109 main(int argc, char **argv)
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110 {
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111 int devcount = 0;
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112
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113 /* Load the SDL library */
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114 if (SDL_Init(SDL_INIT_AUDIO) < 0) {
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115 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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116 return (1);
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117 }
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118
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119 printf("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
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120
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121 devcount = SDL_GetNumAudioDevices(0);
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122 if (devcount < 1) {
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123 fprintf(stderr, "Don't see any specific audio devices!\n");
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124 } else {
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125 if (argv[1] == NULL) {
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126 argv[1] = "sample.wav";
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127 }
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128
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129 /* Load the wave file into memory */
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130 if (SDL_LoadWAV(argv[1], &spec, &sound, &soundlen) == NULL) {
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131 fprintf(stderr, "Couldn't load %s: %s\n", argv[1],
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132 SDL_GetError());
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133 } else {
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134 test_multi_audio(devcount);
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135 SDL_FreeWAV(sound);
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136 }
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137 }
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138
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139 SDL_Quit();
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140 return 0;
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141 }