Add tests for playback states

Author: ehsan

src/library_openal.js

@@ -288,7 +288,8 @@ var LibraryOpenAL = {
     src.buffer = AL.currentContext.src[source - 1].buffer;
     src.connect(AL.currentContext.src[source - 1].gain);
     src.start(0, offset);
-    AL.currentContext.src[source - 1].playTime = AL.currentContext.ctx.currentTime;
+    // Work around Firefox bug 851338
+    AL.currentContext.src[source - 1].playTime = AL.currentContext.ctx.currentTime || 0;
     AL.currentContext.src[source - 1].paused = false;
     AL.currentContext.src[source - 1]['src'] = src;
   },
@@ -320,7 +321,8 @@ var LibraryOpenAL = {
     if ("src" in AL.currentContext.src[source - 1] &&
         !AL.currentContext.src[source - 1].paused) {
       AL.currentContext.src[source - 1].paused = true;
-      AL.currentContext.src[source - 1].pausedTime = AL.currentContext.ctx.currentTime;
+      // Work around Firefox bug 851338
+      AL.currentContext.src[source - 1].pausedTime = AL.currentContext.ctx.currentTime || 0;
       AL.currentContext.src[source - 1]["src"].stop(0);
       delete AL.currentContext.src[source - 1].src;
     }

tests/openal_playback.cpp

@@ -2,6 +2,28 @@
 #include <stdlib.h>
 #include <AL/al.h>
 #include <AL/alc.h>
+#include <assert.h>
+#include <emscripten.h>
+
+void playSource(void* arg)
+{
+  ALuint source = reinterpret_cast<ALuint>(arg);
+  ALint state;
+  alGetSourcei(source, AL_SOURCE_STATE, &state);
+  assert(state == AL_PLAYING);
+  alSourcePause(source);
+  alGetSourcei(source, AL_SOURCE_STATE, &state);
+  assert(state == AL_PAUSED);
+  alSourcePlay(source);
+  alGetSourcei(source, AL_SOURCE_STATE, &state);
+  assert(state == AL_PLAYING);
+  alSourceStop(source);
+  alGetSourcei(source, AL_SOURCE_STATE, &state);
+  assert(state == AL_STOPPED);
+
+  int result = 1;
+  REPORT_RESULT();
+}
 
 int main() {
   ALCdevice* device = alcOpenDevice(NULL);
@@ -78,10 +100,16 @@ int main() {
 
   alSourcei(sources[0], AL_BUFFER, buffers[0]);
 
+  ALint state;
+  alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
+  assert(state == AL_INITIAL);
+
   alSourcePlay(sources[0]);
 
-  int result = 1;
-  REPORT_RESULT();
+  alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
+  assert(state == AL_PLAYING);
+
+  emscripten_async_call(playSource, reinterpret_cast<void*>(sources[0]), 700);
 
   return 0;
 }