Expose flash playback status and volume control to content renderer

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index c73b789cb8f00d00a90ce6b3407b47fca487437e..ca313fa8baff8a06bad8f20de0e7d7636354b57d 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -116,6 +116,7 @@
 #include "content/renderer/navigation_state_impl.h"
 #include "content/renderer/notification_permission_dispatcher.h"
 #include "content/renderer/pepper/plugin_instance_throttler_impl.h"
+#include "content/renderer/pepper/ppb_audio_impl.h"
 #include "content/renderer/presentation/presentation_dispatcher.h"
 #include "content/renderer/push_messaging/push_messaging_dispatcher.h"
 #include "content/renderer/render_frame_proxy.h"
@@ -1483,6 +1484,9 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_ContextMenuClosed, OnContextMenuClosed)
     IPC_MESSAGE_HANDLER(FrameMsg_CustomContextMenuAction,
                         OnCustomContextMenuAction)
+#if defined(ENABLE_PLUGINS)
+    IPC_MESSAGE_HANDLER(FrameMsg_SetPepperVolume, OnSetPepperVolume)
+#endif  //defined(ENABLE_PLUGINS)
     IPC_MESSAGE_HANDLER(InputMsg_Undo, OnUndo)
     IPC_MESSAGE_HANDLER(InputMsg_Redo, OnRedo)
     IPC_MESSAGE_HANDLER(InputMsg_Cut, OnCut)
@@ -6238,6 +6242,36 @@ void RenderFrameImpl::PepperFocusChanged(PepperPluginInstanceImpl* instance,
   GetRenderWidget()->UpdateSelectionBounds();
 }
 
+void RenderFrameImpl::PepperStartsPlayback(
+    PepperPluginInstanceImpl* instance, PPB_Audio_Impl* ppb_audio) {
+  // Only send start signal for the first PPB_Audio_Impl starts playback.
+  if (pepper_audios_map_[instance->pp_instance()].empty()) {
+    RenderFrameImpl* const render_frame = instance->render_frame();
+    // TODO(zqzhang): fire PepperStartsPlayback signal to the browser.
+  }
+  // TODO(zqzhang): it is unsure that whether a pepper instance can
+  // have multiple audio instances. Currently let the pepper instance
+  // delegates the SetVolume() method of all it's audio instances.

[no sievers, 2016/06/21 18:58:58]

can you DCHECK() that it does not exist?

[Zhiqiang Zhang (Slow), 2016/06/21 19:32:02]

I think we should not trust Flash, so I added early return here instead of
DCHECK().

+  pepper_audios_map_[instance->pp_instance()].insert(ppb_audio);
+}
+
+void RenderFrameImpl::PepperStopsPlayback(
+    PepperPluginInstanceImpl* instance, PPB_Audio_Impl* ppb_audio) {
+  pepper_audios_map_[instance->pp_instance()].erase(ppb_audio);

[no sievers, 2016/06/21 18:58:58]

can you DCHECK() that it exists?

[Zhiqiang Zhang (Slow), 2016/06/21 19:32:02]

Ditto.

+
+  RenderFrameImpl* const render_frame = instance->render_frame();
+  // Only send stop signal for the last PPB_Audio_Impl stops playback.
+  if (render_frame && pepper_audios_map_[instance->pp_instance()].empty()) {
+    // TODO(zqzhang): fire PepperStopsPlayback signal to the browser.
+  }
+}
+
+void RenderFrameImpl::OnSetPepperVolume(int32_t pp_instance, double volume) {
+  if (pepper_audios_map_.count(pp_instance) == 0) return;
+  for (auto* ppb_audio : pepper_audios_map_[pp_instance]) {
+    ppb_audio->SetVolume(volume);
+  }
+}
 #endif  // ENABLE_PLUGINS
 
 void RenderFrameImpl::RenderWidgetSetFocus(bool enable) {