Mercurial > sdl-ios-xcode

annotate test/testmultiaudio.c @ 2661:d38309be5178 gsoc2008_audio_resampling

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The windowed sinc filter generation code seems to be working fine. The FIR filtering code is also now working reasonably well. Occasionally the FIR filter will pop, but setting the normalization factor lower seems to help this. I suspect the problem is in the fixed point multiply/add. I also have a hunch the zero stuffing/sample discarding code is not correct, and I'll look at that soon to get it sorted out.
author Aaron Wishnick <schnarf@gmail.com>
date Wed, 02 Jul 2008 08:04:50 +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 }