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testmultiaudio.c
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testmultiaudio.c
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#include "SDL.h"
static SDL_AudioSpec spec;
static Uint8 *sound = NULL; /* Pointer to wave data */
static Uint32 soundlen = 0; /* Length of wave data */
typedef struct
{
SDL_AudioDeviceID dev;
int soundpos;
volatile int done;
} callback_data;
void SDLCALL
play_through_once(void *arg, Uint8 * stream, int len)
{
callback_data *cbd = (callback_data *) arg;
Uint8 *waveptr = sound + cbd->soundpos;
int waveleft = soundlen - cbd->soundpos;
int cpy = len;
if (cpy > waveleft)
cpy = waveleft;
SDL_memcpy(stream, waveptr, cpy);
len -= cpy;
cbd->soundpos += cpy;
if (len > 0) {
stream += cpy;
SDL_memset(stream, spec.silence, len);
cbd->done++;
}
}
static void
test_multi_audio(int devcount)
{
callback_data cbd[64];
int keep_going = 1;
int i;
if (devcount > 64) {
fprintf(stderr, "Too many devices (%d), clamping to 64...\n",
devcount);
devcount = 64;
}
spec.callback = play_through_once;
for (i = 0; i < devcount; i++) {
const char *devname = SDL_GetAudioDeviceName(i, 0);
printf("playing on device #%d: ('%s')...", i, devname);
fflush(stdout);
SDL_memset(&cbd[0], '\0', sizeof(callback_data));
spec.userdata = &cbd[0];
cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
if (cbd[0].dev == 0) {
printf("\nOpen device failed: %s\n", SDL_GetError());
} else {
SDL_PauseAudioDevice(cbd[0].dev, 0);
while (!cbd[0].done)
SDL_Delay(100);
SDL_PauseAudioDevice(cbd[0].dev, 1);
printf("done.\n");
SDL_CloseAudioDevice(cbd[0].dev);
}
}
SDL_memset(cbd, '\0', sizeof(cbd));
printf("playing on all devices...\n");
for (i = 0; i < devcount; i++) {
const char *devname = SDL_GetAudioDeviceName(i, 0);
spec.userdata = &cbd[i];
cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0);
if (cbd[i].dev == 0) {
printf("Open device %d failed: %s\n", i, SDL_GetError());
}
}
for (i = 0; i < devcount; i++) {
if (cbd[i].dev) {
SDL_PauseAudioDevice(cbd[i].dev, 0);
}
}
while (keep_going) {
keep_going = 0;
for (i = 0; i < devcount; i++) {
if ((cbd[i].dev) && (!cbd[i].done)) {
keep_going = 1;
}
}
SDL_Delay(100);
}
for (i = 0; i < devcount; i++) {
if (cbd[i].dev) {
SDL_PauseAudioDevice(cbd[i].dev, 1);
SDL_CloseAudioDevice(cbd[i].dev);
}
}
printf("All done!\n");
}
int
main(int argc, char **argv)
{
int devcount = 0;
/* Load the SDL library */
if (SDL_Init(SDL_INIT_AUDIO) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
printf("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
devcount = SDL_GetNumAudioDevices(0);
if (devcount < 1) {
fprintf(stderr, "Don't see any specific audio devices!\n");
} else {
if (argv[1] == NULL) {
argv[1] = "sample.wav";
}
/* Load the wave file into memory */
if (SDL_LoadWAV(argv[1], &spec, &sound, &soundlen) == NULL) {
fprintf(stderr, "Couldn't load %s: %s\n", argv[1],
SDL_GetError());
} else {
test_multi_audio(devcount);
SDL_FreeWAV(sound);
}
}
SDL_Quit();
return 0;
}