Microphone support for Pepper Flash.

ppapi/shared_impl/audio_input_impl.h

Index: ppapi/shared_impl/audio_input_impl.h
diff --git a/ppapi/shared_impl/audio_input_impl.h b/ppapi/shared_impl/audio_input_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..e7604c33d36eedf478c3710bf6be9e7b01636895
--- /dev/null
+++ b/ppapi/shared_impl/audio_input_impl.h
@@ -0,0 +1,88 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_SHARED_IMPL_AUDIO_INPUT_IMPL_H_
+#define PPAPI_SHARED_IMPL_AUDIO_INPUT_IMPL_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/shared_memory.h"
+#include "base/sync_socket.h"
+#include "base/threading/simple_thread.h"
+#include "ppapi/c/dev/ppb_audio_input_dev.h"
+#include "ppapi/shared_impl/resource.h"
+#include "ppapi/thunk/ppb_audio_input_api.h"
+
+namespace ppapi {
+
+// Implements the logic to map shared memory and run the audio thread signaled
+// from the sync socket. Both the proxy and the renderer implementation use
+// this code.
+class PPAPI_SHARED_EXPORT AudioInputImpl
+    : public thunk::PPB_AudioInput_API,
+      public base::DelegateSimpleThread::Delegate {
+ public:
+  AudioInputImpl();
+  virtual ~AudioInputImpl();
+
+  bool capturing() const { return capturing_; }
+
+  // Sets the callback information that the background thread will use. This
+  // is optional. Without a callback, the thread will not be run. This
+  // non-callback mode is used in the renderer with the proxy, since the proxy
+  // handles the callback entirely within the plugin process.
+  void SetCallback(PPB_AudioInput_Callback callback, void* user_data);
+
+  // Configures the current state to be playing or not. The caller is
+  // responsible for ensuring the new state is the opposite of the current one.
+  //
+  // This is the implementation for PPB_AudioInput.Start/StopCapture, except
+  // that it does not actually notify the audio system to stop capture, it just
+  // configures our object to stop generating callbacks. The actual stop
+  // playback request will be done in the derived classes and will be different
+  // from the proxy and the renderer.
+  void SetStartCaptureState();
+  void SetStopCaptureState();

[dmichael (off chromium), 2011/11/17 04:05:21]

Should these be protected? Maybe some of the others as well?

+
+  // Sets the shared memory and socket handles. This will automatically start
+  // playback if we're currently set to play.
+  void SetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
+                     size_t shared_memory_size,
+                     base::SyncSocket::Handle socket_handle);
+
+ private:
+  // Starts execution of the audio input thread.
+  void StartThread();
+
+  // DelegateSimpleThread::Delegate implementation.
+  // Run on the audio input thread.
+  virtual void Run();

[dmichael (off chromium), 2011/11/17 04:05:21]

Are all the other methods in the class run on the audio input thread too? (I'm
guessing not...)

I usually prefer to use a separate class for a separate thread, if practical. It
just makes it simpler to know what you can access on what thread.

+
+  // True if capturing the stream.
+  bool capturing_;
+
+  // Socket used to notify us when audio is ready to accept new samples. This
+  // pointer is created in StreamCreated().
+  scoped_ptr<base::SyncSocket> socket_;
+
+  // Sample buffer in shared memory. This pointer is created in
+  // StreamCreated(). The memory is only mapped when the audio thread is
+  // created.
+  scoped_ptr<base::SharedMemory> shared_memory_;
+
+  // The size of the sample buffer in bytes.
+  size_t shared_memory_size_;
+
+  // When the callback is set, this thread is spawned for calling it.
+  scoped_ptr<base::DelegateSimpleThread> audio_input_thread_;
+
+  // Callback to call when audio is ready to produce new samples.
+  PPB_AudioInput_Callback callback_;
+
+  // User data pointer passed verbatim to the callback function.
+  void* user_data_;
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_AUDIO_INPUT_IMPL_H_