static unsigned int S_CaptureDriverUpdate (void* driverContext, unsigned char* buffer, int minBytes, int maxBytes)
{
SDL_AudioDeviceID inputdevid = (SDL_AudioDeviceID)driverContext;
unsigned int available = SDL_GetQueuedAudioSize (inputdevid);
if (available > minBytes) {
return SDL_DequeueAudio (inputdevid, buffer, maxBytes);
}
return 0;
}
void SNDDMA_Capture(int samples, byte *data)
{
#ifdef USE_SDL_AUDIO_CAPTURE
// multiplied by 2 to convert from (mono16) samples to bytes.
if (sdlCaptureDevice)
{
SDL_DequeueAudio(sdlCaptureDevice, data, samples * 2);
}
else
#endif
{
SDL_memset(data, '\0', samples * 2);
}
}
static void
loop()
{
SDL_bool please_quit = SDL_FALSE;
SDL_Event e;
while (SDL_PollEvent(&e)) {
if (e.type == SDL_QUIT) {
please_quit = SDL_TRUE;
} else if (e.type == SDL_KEYDOWN) {
if (e.key.keysym.sym == SDLK_ESCAPE) {
please_quit = SDL_TRUE;
}
} else if (e.type == SDL_MOUSEBUTTONDOWN) {
if (e.button.button == 1) {
SDL_PauseAudioDevice(devid_out, SDL_TRUE);
SDL_PauseAudioDevice(devid_in, SDL_FALSE);
}
} else if (e.type == SDL_MOUSEBUTTONUP) {
if (e.button.button == 1) {
SDL_PauseAudioDevice(devid_in, SDL_TRUE);
SDL_PauseAudioDevice(devid_out, SDL_FALSE);
}
}
}
if (SDL_GetAudioDeviceStatus(devid_in) == SDL_AUDIO_PLAYING) {
SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
} else {
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
}
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
if (please_quit) {
/* stop playing back, quit. */
SDL_Log("Shutting down.\n");
SDL_PauseAudioDevice(devid_in, 1);
SDL_CloseAudioDevice(devid_in);
SDL_PauseAudioDevice(devid_out, 1);
SDL_CloseAudioDevice(devid_out);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
#ifdef __EMSCRIPTEN__
emscripten_cancel_main_loop();
#endif
exit(0);
}
/* Note that it would be easier to just have a one-line function that
calls SDL_QueueAudio() as a capture device callback, but we're
trying to test the API, so we use SDL_DequeueAudio() here. */
while (SDL_TRUE) {
Uint8 buf[1024];
const Uint32 br = SDL_DequeueAudio(devid_in, buf, sizeof (buf));
SDL_QueueAudio(devid_out, buf, br);
if (br < sizeof (buf)) {
break;
}
}
}
