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testaudiocapture: made test app interactive.
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(hold down mouse/finger to record, then it plays back what it heard. Repeat.)
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@icculus
icculus committed Aug 3, 2016
1 parent a9ef240 commit 3ed9b0f
Showing 1 changed file with 38 additions and 85 deletions.
123 changes: 38 additions & 85 deletions test/testaudiocapture.c
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Expand Up @@ -15,104 +15,61 @@
#include <emscripten/emscripten.h>
#endif

#define CAPTURE_SECONDS 5

#define DO_VIDEO defined(__ANDROID__) || defined(__IPHONEOS__) || defined(__EMSCRIPTEN__)
#if DO_VIDEO
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
#endif

static SDL_AudioSpec spec;
static Uint8 *sound = NULL; /* Pointer to wave data */
static Uint32 soundlen = 0; /* Length of wave data */
static Uint32 processed = 0;
static SDL_AudioDeviceID devid = 0;
static SDL_AudioDeviceID devid_in = 0;
static SDL_AudioDeviceID devid_out = 0;

void SDLCALL
capture_callback(void *arg, Uint8 * stream, int len)
{
const int avail = (int) (soundlen - processed);
if (len > avail) {
len = avail;
}

/*SDL_Log("CAPTURE CALLBACK: %d more bytes\n", len);*/
SDL_memcpy(sound + processed, stream, len);
processed += len;
}

void SDLCALL
play_callback(void *arg, Uint8 * stream, int len)
{
const Uint8 *waveptr = sound + processed;
const int avail = soundlen - processed;
int cpy = len;
if (cpy > avail) {
cpy = avail;
}

/*SDL_Log("PLAY CALLBACK: %d more bytes\n", cpy);*/
SDL_memcpy(stream, waveptr, cpy);
processed += cpy;

len -= cpy;
if (len > 0) {
SDL_memset(stream + cpy, spec.silence, len);
}
SDL_QueueAudio(devid_out, stream, len);
}

static void
loop()
{
SDL_Event e;
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 DO_VIDEO
if (spec.callback == capture_callback) {
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);
#endif

if ((!please_quit) && (processed >= soundlen)) {
processed = 0;
if (spec.callback == capture_callback) {
SDL_Log("Done recording, playing back...\n");
SDL_PauseAudioDevice(devid, 1);
SDL_CloseAudioDevice(devid);

spec.callback = play_callback;
devid = SDL_OpenAudioDevice(NULL, 0, &spec, &spec, 0);
if (!devid) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for playback!\n");
SDL_Quit();
exit(1);
}

SDL_PauseAudioDevice(devid, 0);
} else {
SDL_Log("Done playing back.\n");
please_quit = SDL_TRUE;
}
}

if (please_quit) {
/* stop playing back, quit. */
SDL_Log("Shutting down.\n");
SDL_PauseAudioDevice(devid, 1);
SDL_CloseAudioDevice(devid);
SDL_free(sound);
sound = NULL;
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();
Expand All @@ -138,14 +95,11 @@ main(int argc, char **argv)
return (1);
}

/* Android apparently needs a window...? */
#if DO_VIDEO
window = SDL_CreateWindow("testaudiocapture", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, SDL_WINDOW_FULLSCREEN_DESKTOP);
renderer = SDL_CreateRenderer(window, -1, 0);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
#endif

SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());

Expand All @@ -161,29 +115,28 @@ main(int argc, char **argv)
spec.samples = 1024;
spec.callback = capture_callback;

soundlen = spec.freq * (SDL_AUDIO_BITSIZE(spec.format) / 8) * spec.channels * CAPTURE_SECONDS;
sound = (Uint8 *) SDL_malloc(soundlen);
if (!sound) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory\n");
SDL_Quit();
return 1;
}

SDL_Log("Opening device %s%s%s...\n",
SDL_Log("Opening capture device %s%s%s...\n",
devname ? "'" : "",
devname ? devname : "[[default]]",
devname ? "'" : "");

devid = SDL_OpenAudioDevice(argv[1], SDL_TRUE, &spec, &spec, 0);
if (!devid) {
devid_in = SDL_OpenAudioDevice(argv[1], SDL_TRUE, &spec, &spec, 0);
if (!devid_in) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());
SDL_Quit();
exit(1);
}

SDL_Log("Opening default playback device...\n");
spec.callback = NULL;
devid_out = SDL_OpenAudioDevice(NULL, SDL_FALSE, &spec, &spec, 0);
if (!devid_out) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());
SDL_free(sound);
SDL_Quit();
exit(1);
}

SDL_Log("Recording for %d seconds...\n", CAPTURE_SECONDS);
SDL_PauseAudioDevice(devid, 0);
SDL_Log("Ready! Hold down mouse or finger to record!\n");

#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
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