More work on full-duplex with WebAudio.

tests/mal_duplex.c

@@ -6,6 +6,12 @@
 #define DR_WAV_IMPLEMENTATION
 #include "../extras/dr_wav.h"
 
+#ifdef __EMSCRIPTEN__
+void main_loop__em()
+{
+}
+#endif
+
 void log_callback(mal_context* pContext, mal_device* pDevice, mal_uint32 logLevel, const char* message)
 {
     (void)pContext;
@@ -25,17 +31,20 @@ void data_callback(mal_device* pDevice, void* pOutput, const void* pInput, mal_u
     /* In this test the format and channel count are the same for both input and output which means we can just memcpy(). */
     mal_copy_memory(pOutput, pInput, frameCount * mal_get_bytes_per_frame(pDevice->capture.format, pDevice->capture.channels));
 
+#if 0
     /* Also write to a wav file for debugging. */
     drwav* pWav = (drwav*)pDevice->pUserData;
     mal_assert(pWav != NULL);
 
     drwav_write_pcm_frames(pWav, frameCount, pInput);
+#endif
 }
 
 int main(int argc, char** argv)
 {
     mal_result result;
 
+#if 0
     drwav_data_format wavFormat;
     wavFormat.container     = drwav_container_riff;
     wavFormat.format        = DR_WAVE_FORMAT_PCM;
@@ -48,9 +57,10 @@ int main(int argc, char** argv)
         printf("Failed to initialize output file.\n");
         return -1;
     }
+#endif
     
 
-    mal_backend backend = mal_backend_dsound;
+    mal_backend backend = mal_backend_webaudio;
 
     mal_context_config contextConfig = mal_context_config_init();
     contextConfig.logCallback = log_callback;
@@ -74,7 +84,7 @@ int main(int argc, char** argv)
     deviceConfig.periods            = 2;
     deviceConfig.dataCallback       = data_callback;
     deviceConfig.stopCallback       = stop_callback;
-    deviceConfig.pUserData          = &wav;
+    deviceConfig.pUserData          = NULL; /*&wav;*/
 
     mal_device device;
     result = mal_device_init(&context, &deviceConfig, &device);
@@ -82,13 +92,21 @@ int main(int argc, char** argv)
         return result;
     }
 
+#ifdef __EMSCRIPTEN__
+    getchar();
+#endif
+
     mal_device_start(&device);
 
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(main_loop__em, 0, 1);
+#else
     printf("Press Enter to quit...\n");
     getchar();
+#endif
 
     mal_device_uninit(&device);
-    drwav_uninit(&wav);
+    /*drwav_uninit(&wav);*/
 
     (void)argc;
     (void)argv;