Implementation of ppapi audio.

webkit/plugins/ppapi/plugin_delegate.h

Index: webkit/plugins/ppapi/plugin_delegate.h
===================================================================
--- webkit/plugins/ppapi/plugin_delegate.h	(revision 109955)
+++ webkit/plugins/ppapi/plugin_delegate.h	(working copy)
@@ -216,6 +216,35 @@
     virtual ~PlatformAudio() {}
   };
 
+  class PlatformAudioInput {
+   public:
+    class Client {
+     protected:
+      virtual ~Client() {}
+
+     public:
+      // Called when the stream is created.
+      virtual void StreamCreated(base::SharedMemoryHandle shared_memory_handle,

[viettrungluu, 2011/11/16 01:08:34]

I'm going to refactor this to get rid of the StreamCreate_ stuff. Probably both
PlatformAudio and PlatformAudioInput will just share a PlatformAudioCommonClient
(or whatever I decide to call it), and then the AudioHelper will become an Impl.
Probably OnSetStreamInfo() will figure into this somehow too.

+                                 size_t shared_memory_size,
+                                 base::SyncSocket::Handle socket) = 0;
+    };
+
+    // Starts the playback. Returns false on error or if called before the
+    // stream is created or after the stream is closed.
+    virtual bool StartCapture() = 0;
+
+    // Stops the capture. Returns false on error or if called before the stream
+    // is created or after the stream is closed.
+    virtual bool StopCapture() = 0;
+
+    // Closes the stream. Make sure to call this before the object is
+    // destructed.
+    virtual void ShutDown() = 0;
+
+   protected:
+    virtual ~PlatformAudioInput() {}
+  };
+
   // Interface for PlatformVideoDecoder is directly inherited from general media
   // VideoDecodeAccelerator interface.
   class PlatformVideoDecoder : public media::VideoDecodeAccelerator {
@@ -294,6 +323,12 @@
                                      uint32_t sample_count,
                                      PlatformAudio::Client* client) = 0;
 
+  // The caller is responsible for calling Shutdown() on the returned pointer
+  // to clean up the corresponding resources allocated during this call.
+  virtual PlatformAudioInput* CreateAudioInput(uint32_t sample_rate,
+      uint32_t sample_count,
+      PlatformAudioInput::Client* client) = 0;
+
   // A pointer is returned immediately, but it is not ready to be used until
   // BrokerConnected has been called.
   // The caller is responsible for calling Release() on the returned pointer