Desktop chrome tab capture-chooseDesktopMedia()

content/public/browser/desktop_media_id.h

 // Copyright 2013 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 CONTENT_PUBLIC_BROWSER_DESKTOP_MEDIA_ID_H_
 #define CONTENT_PUBLIC_BROWSER_DESKTOP_MEDIA_ID_H_
 
 #include <string>
 #include <tuple>
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 
 #if defined(USE_AURA)
 namespace aura {
 class Window;
 }  // namespace aura
 #endif  // defined(USE_AURA)
 
 namespace content {
 
 // Type used to identify desktop media sources. It's converted to string and
 // stored in MediaStreamRequest::requested_video_device_id.
 struct CONTENT_EXPORT DesktopMediaID {
  public:
-  enum Type {
-    TYPE_NONE,
-    TYPE_SCREEN,
-    TYPE_WINDOW,
-  };
+  enum Type { TYPE_NONE, TYPE_SCREEN, TYPE_WINDOW, TYPE_TAB };
 
   typedef intptr_t Id;
 
   // Represents an "unset" value for either |id| or |aura_id|.
   static const Id kNullId = 0;
+  static const int kINVALIDID = -1;

[qiangchen, 2015/12/07 22:45:56]

Any reason kNullId isn't sufficient to use?

[miu, 2015/12/08 01:54:38]

style: kInvalidId

[GeorgeZ, 2015/12/09 19:36:38]

This is to make the code safe. render_processor_id and main_render_frame_id
cannot be negative value logically. However there is no definitely guarantee
that they cannot be 0.

[GeorgeZ, 2015/12/09 19:36:38]

Done.

 
 #if defined(USE_AURA)
   // Assigns integer identifier to the |window| and returns its DesktopMediaID.
   static DesktopMediaID RegisterAuraWindow(Type type, aura::Window* window);
 
   // Returns the Window that was previously registered using
   // RegisterAuraWindow(), else nullptr.
   static aura::Window* GetAuraWindowById(const DesktopMediaID& id);
 #endif  // defined(USE_AURA)
 
   static DesktopMediaID Parse(const std::string& str);
 
   DesktopMediaID() = default;
 
   DesktopMediaID(Type type, Id id)
       : type(type),
         id(id) {
   }
 
   // Operators so that DesktopMediaID can be used with STL containers.
   bool operator<(const DesktopMediaID& other) const {
 #if defined(USE_AURA)
-    return std::tie(type, id, aura_id) <
-           std::tie(other.type, other.id, other.aura_id);
+    return std::tie(type, id, aura_id, main_render_frame_id,
+                    render_process_id) <
+           std::tie(other.type, other.id, other.aura_id,
+                    other.main_render_frame_id, other.render_process_id);
 #else
-    return std::tie(type, id) < std::tie(other.type, other.id);
+    return std::tie(type, id, main_render_frame_id, render_process_id) <
+           std::tie(other.type, other.id, other.main_render_frame_id,
+                    other.render_process_id);
 #endif
   }
+
   bool operator==(const DesktopMediaID& other) const {
 #if defined(USE_AURA)
-    return type == other.type && id == other.id && aura_id == other.aura_id;
+    return type == other.type && id == other.id && aura_id == other.aura_id &&
+           render_process_id == other.render_process_id &&
+           main_render_frame_id == other.main_render_frame_id;
 #else
-    return type == other.type && id == other.id;
+    return type == other.type && id == other.id &&
+           render_process_id == other.render_process_id &&
+           main_render_frame_id == other.main_render_frame_id;
 #endif
   }
 
   bool is_null() { return type == TYPE_NONE; }
 
-  std::string ToString();
+  std::string ToString() const;
 
   Type type = TYPE_NONE;
 
   // The IDs referring to the target native screen or window.  |id| will be
   // non-null if and only if it refers to a native screen/window.  |aura_id|
   // will be non-null if and only if it refers to an Aura window.  Note that is
   // it possible for both of these to be non-null, which means both IDs are
   // referring to the same logical window.
   Id id = kNullId;
 #if defined(USE_AURA)
   // TODO(miu): Make this an int, after clean-up for http://crbug.com/513490.
   Id aura_id = kNullId;
 #endif
+
+  // Tab video and audio capture need render process id and render frame id.
+  int render_process_id = kINVALIDID;
+  int main_render_frame_id = kINVALIDID;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DESKTOP_MEDIA_ID_H_