Add render view id to AudioRendererHost

AudioRendererHost were assigning ids in the browser process, that means
CreateStream has to be done in a synchronous IPC call. To avoid that we
allow renderer processes to provide the stream id when they do
CreateStrea. Then to identify a IPCAudioSource inside AudioRendererHost
we need a tuple of (render_view_id, stream_id). By doing this we can
create stream asynchronously just like BeginRequest in
ResourceDispatcherHost.

Review URL: http://codereview.chromium.org/21319

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9824 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 42 insertions, 36 deletions

diff --git a/chrome/browser/renderer_host/audio_renderer_host.h b/chrome/browser/renderer_host/audio_renderer_host.h
index df2c14e..bcdf640 100644
--- a/chrome/browser/renderer_host/audio_renderer_host.h
+++ b/chrome/browser/renderer_host/audio_renderer_host.h
@@ -6,17 +6,16 @@
 // lives inside the render process and provide access to audio hardware. It maps
 // an internal ID to AudioRendererHost::IPCAudioSource in a map, which is the
 // actual object providing audio packets through IPC. It creates the actual
-// AudioOutputStream object when requested by the renderer and returns an
-// internal ID. It then delegates calls to the AudioOutputStream object indexed
-// by the internal id.
+// AudioOutputStream object when requested by the renderer provided with
+// render view id and stream id.
 //
 // AudioRendererHost::IPCAudioSource is a container of AudioOutputStream and
 // provide audio packets to the associated AudioOutputStream through IPC. It
 // transforms the pull data model to a push model used for IPC. When asked by
 // AudioOutputStream for an audio packet, it would send a message to renderer,
 // passing a SharedMemoryHandle for filling the buffer.
-// NotifyPacketReady(|stream_id|) would be called when the buffer is filled
-// and ready to be consumed.
+// NotifyPacketReady(|render_view_id|, |stream_id|) would be called when the
+// buffer is filled and ready to be consumed.
 //
 // This class is owned by BrowserRenderProcessHost, and instantiated on UI
 // thread, but all other operations and method calls (except Destroy()) happens
@@ -41,7 +40,8 @@
 #ifndef CHROME_BROWSER_RENDERER_HOST_AUDIO_RENDERER_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_AUDIO_RENDERER_HOST_H_
 
-#include "base/id_map.h"
+#include <map>
+
 #include "base/ref_counted.h"
 #include "base/shared_memory.h"
 #include "chrome/common/ipc_message.h"
@@ -52,55 +52,55 @@ class MessageLoop;
 
 class AudioRendererHost : public base::RefCountedThreadSafe<AudioRendererHost> {
  public:
-  static const int32 INVALID_ID = 0;
-
   explicit AudioRendererHost(MessageLoop* message_loop);
   ~AudioRendererHost();
 
   // Creates an audio output stream with the specified format, returns the
-  // stream id if successful, otherwise INVALID_ID. If this call is successful
-  // this object would keep an internal entry of the stream about the
-  // required properties, renderer process handle and IPC channel for sending
-  // buffer request messages.
-  int32 CreateStream(IPC::Message::Sender* sender, base::ProcessHandle handle,
-                     AudioManager::Format format, int channels, int sample_rate,
-                     int bits_per_sample, size_t packet_size);
+  // true if successful. If this call is successful this object would keep an
+  // internal entry of the stream about the required properties, renderer
+  // process handle and IPC channel for sending buffer request messages.
+  bool CreateStream(IPC::Message::Sender* sender, base::ProcessHandle handle,
+                    int32 render_view_id, int32 stream_id,
+                    AudioManager::Format format, int channels, int sample_rate,
+                    int bits_per_sample, size_t packet_size);
 
   // Start the audio output strean, return false if stream doesn't exist or the
   // cannot start.
-  bool Start(int32 stream_id);
+  bool Start(int32 render_view_id, int32 stream_id);
 
   // Stop the audio output stream, return false if stream doesn't exist or
   // cannot stop.
-  bool Stop(int32 stream_id);
+  bool Stop(int32 render_view_id, int32 stream_id);
 
   // Close the audio output stream, return false if stream doesn't exist or
   // cannot close. If this call is successful, the AudioOutputStream correspond
-  // to |stream_id| would go unmanaged by this class, subsequent calls to
-  // this object with the same |stream_id| would fail.
-  bool Close(int32 stream_id);
+  // to (|render_view_id|, |stream_id|) would go unmanaged by this class,
+  // subsequent calls to this object with the same
+  // (|render_view_id|, |stream_id|) would fail.
+  bool Close(int32 render_view_id, int32 stream_id);
 
   // Set the volume for the stream specified, returns true if successful, false
   // if stream doesn't exist or cann't set volume.
-  bool SetVolume(
-      int32 stream_id, double left_channel, double right_channel);
+  bool SetVolume(int32 render_view_id, int32 stream_id,
+      double left_channel, double right_channel);
 
   // Get the volume of the stream specified, returns true if successful, false
   // is stream doesn't exist or can't get volume.
-  bool GetVolume(
-      int32 stream_id, double* left_channel, double* right_channel);
+  bool GetVolume(int32 render_view_id, int32 stream_id,
+      double* left_channel, double* right_channel);
 
   // Notify packet has been prepared for stream specified by |stream_id|. The
-  // buffer associated with |stream_id| has been filled and is ready to be
-  // consumed.
-  void NotifyPacketReady(int32 stream_id);
+  // buffer associated with (|render_view_id|, |stream_id|) has been filled and
+  // is ready to be consumed.
+  void NotifyPacketReady(int32 render_view_id, int32 stream_id);
 
   // Called from UI thread from the owner of this object.
   void Destroy();
 
-  // Destroy the stream specified by |stream_id| and remove it from map.
+  // Destroy the stream specified by (|render_view_id|, |stream_id|) and remove
+  // it from map.
   // *DO NOT* call this method other than from IPCAudioSource.
-  void DestroySource(int32 stream_id);
+  void DestroySource(int32 render_view_id, int32 stream_id);
 
  private:
   // Methods called on IO thread.
@@ -117,7 +117,8 @@ class AudioRendererHost : public base::RefCountedThreadSafe<AudioRendererHost> {
   class IPCAudioSource : public AudioOutputStream::AudioSourceCallback {
    public:
     IPCAudioSource(AudioRendererHost* host,         // Host of this source.
-                   int32 id,                        // ID of this source.
+                   int32 render_view_id,            // Routing ID to RenderView.
+                   int32 stream_id,                 // ID of this source.
                    AudioOutputStream* stream,       // Stream associated.
                    IPC::Message::Sender* sender,    // IPC sender to user.
                    base::ProcessHandle process,     // Render process handle.
@@ -135,23 +136,28 @@ class AudioRendererHost : public base::RefCountedThreadSafe<AudioRendererHost> {
     // consumed.
     void NotifyPacketReady();
 
-    int32 id() { return id_; }
+    int32 render_view_id() { return render_view_id_; }
+    int32 stream_id() { return stream_id_; }
     AudioOutputStream* stream() { return stream_; }
 
    private:
     AudioRendererHost* host_;
-    int32 id_;
+    int32 render_view_id_;
+    int32 stream_id_;
     AudioOutputStream* stream_;
     IPC::Message::Sender* sender_;
     base::SharedMemory shared_memory_;
     base::SharedMemoryHandle foreign_memory_handle_;
   };
 
-  // A map of id to audio sources.
-  IDMap<IPCAudioSource> sources_;
+  // Look up a IPCAudioSource with a tuple of render view id and stream id.
+  // Return NULL if not found.
+  IPCAudioSource* Lookup(int render_view_id, int stream_id);
 
-  // An internal id for streams.
-  int32 next_id_;
+  // A map of id to audio sources.
+  typedef std::pair<int32, int32> SourceID;
+  typedef std::map<SourceID, IPCAudioSource*> SourceMap;
+  SourceMap sources_;
 
   // Only used for DCHECKs to make sure all methods calls are from the same
   // thread as this object is created.