1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_EXTENSIONS_API_WEBRTC_AUDIO_PRIVATE_WEBRTC_AUDIO_PRIVATE_API_H_
6 #define CHROME_BROWSER_EXTENSIONS_API_WEBRTC_AUDIO_PRIVATE_WEBRTC_AUDIO_PRIVATE_API_H_
8 #include "base/memory/ref_counted.h"
9 #include "base/system_monitor/system_monitor.h"
10 #include "chrome/browser/extensions/api/profile_keyed_api_factory.h"
11 #include "chrome/browser/extensions/chrome_extension_function.h"
12 #include "chrome/browser/profiles/profile.h"
13 #include "chrome/common/extensions/api/webrtc_audio_private.h"
14 #include "content/public/browser/render_view_host.h"
15 #include "media/audio/audio_device_name.h"
18 namespace extensions {
20 // Listens for device changes and forwards as an extension event.
21 class WebrtcAudioPrivateEventService
22 : public ProfileKeyedAPI,
23 public base::SystemMonitor::DevicesChangedObserver {
25 explicit WebrtcAudioPrivateEventService(Profile* profile);
26 virtual ~WebrtcAudioPrivateEventService();
28 // ProfileKeyedAPI implementation.
29 virtual void Shutdown() OVERRIDE;
30 static ProfileKeyedAPIFactory<WebrtcAudioPrivateEventService>*
32 static const char* service_name();
34 // base::SystemMonitor::DevicesChangedObserver implementation.
35 virtual void OnDevicesChanged(
36 base::SystemMonitor::DeviceType device_type) OVERRIDE;
39 friend class ProfileKeyedAPIFactory<WebrtcAudioPrivateEventService>;
46 // Common base for WebrtcAudioPrivate functions, that provides a
47 // couple of optionally-used common implementations.
48 class WebrtcAudioPrivateFunction : public ChromeAsyncExtensionFunction {
50 WebrtcAudioPrivateFunction();
51 virtual ~WebrtcAudioPrivateFunction();
54 // Retrieves the list of output device names on the appropriate
55 // thread. Call from UI thread, callback will occur on IO thread.
56 void GetOutputDeviceNames();
58 // Must override this if you call GetOutputDeviceNames. Called on IO thread.
59 virtual void OnOutputDeviceNames(
60 scoped_ptr<media::AudioDeviceNames> device_names);
62 // Retrieve the list of AudioOutputController objects. Calls back
63 // via OnControllerList.
65 // Returns false on error, in which case it has set |error_| and the
66 // entire function should fail.
68 // Call from any thread. Callback will occur on originating thread.
69 bool GetControllerList(int tab_id);
71 // Must override this if you call GetControllerList.
72 virtual void OnControllerList(
73 const content::RenderViewHost::AudioOutputControllerList& list);
75 // Calculates a single HMAC. Call from any thread. Calls back via
76 // OnHMACCalculated on UI thread.
78 // This function, and device ID HMACs in this API in general use the
79 // calling extension's ID as the security origin. The only exception
80 // to this rule is when calculating the input device ID HMAC in
81 // getAssociatedSink, where we use the provided |securityOrigin|.
82 void CalculateHMAC(const std::string& raw_id);
84 // Must override this if you call CalculateHMAC.
85 virtual void OnHMACCalculated(const std::string& hmac);
87 // Calculates a single HMAC, using the extension ID as the security origin.
89 // Call only on IO thread.
90 std::string CalculateHMACImpl(const std::string& raw_id);
92 // Initializes |resource_context_|. Must be called on the UI thread,
93 // before any calls to |resource_context()|.
94 void InitResourceContext();
96 // Callable from any thread. Must previously have called
97 // |InitResourceContext()|.
98 content::ResourceContext* resource_context() const;
101 content::ResourceContext* resource_context_;
103 DISALLOW_COPY_AND_ASSIGN(WebrtcAudioPrivateFunction);
106 class WebrtcAudioPrivateGetSinksFunction : public WebrtcAudioPrivateFunction {
108 virtual ~WebrtcAudioPrivateGetSinksFunction() {}
111 DECLARE_EXTENSION_FUNCTION("webrtcAudioPrivate.getSinks",
112 WEBRTC_AUDIO_PRIVATE_GET_SINKS);
114 // Sequence of events is that we query the list of sinks on the
115 // AudioManager's thread, then calculate HMACs on the IO thread,
116 // then finish on the UI thread.
117 virtual bool RunImpl() OVERRIDE;
119 virtual void OnOutputDeviceNames(
120 scoped_ptr<media::AudioDeviceNames> raw_ids) OVERRIDE;
121 void DoneOnUIThread();
124 class WebrtcAudioPrivateGetActiveSinkFunction
125 : public WebrtcAudioPrivateFunction {
127 virtual ~WebrtcAudioPrivateGetActiveSinkFunction() {}
130 DECLARE_EXTENSION_FUNCTION("webrtcAudioPrivate.getActiveSink",
131 WEBRTC_AUDIO_PRIVATE_GET_ACTIVE_SINK);
133 virtual bool RunImpl() OVERRIDE;
134 virtual void OnControllerList(
135 const content::RenderViewHost::AudioOutputControllerList&
136 controllers) OVERRIDE;
137 virtual void OnHMACCalculated(const std::string& hmac) OVERRIDE;
140 class WebrtcAudioPrivateSetActiveSinkFunction
141 : public WebrtcAudioPrivateFunction {
143 WebrtcAudioPrivateSetActiveSinkFunction();
146 virtual ~WebrtcAudioPrivateSetActiveSinkFunction();
149 DECLARE_EXTENSION_FUNCTION("webrtcAudioPrivate.setActiveSink",
150 WEBRTC_AUDIO_PRIVATE_SET_ACTIVE_SINK);
152 virtual bool RunImpl() OVERRIDE;
153 virtual void OnControllerList(
154 const content::RenderViewHost::AudioOutputControllerList&
155 controllers) OVERRIDE;
156 virtual void OnOutputDeviceNames(
157 scoped_ptr<media::AudioDeviceNames> device_names) OVERRIDE;
159 void DoneOnUIThread();
162 std::string sink_id_;
164 // Filled in by OnControllerList.
165 content::RenderViewHost::AudioOutputControllerList controllers_;
167 // Number of sink IDs we are still waiting for. Can become greater
168 // than 0 in OnControllerList, decreases on every OnSinkId call.
169 size_t num_remaining_sink_ids_;
172 class WebrtcAudioPrivateGetAssociatedSinkFunction
173 : public WebrtcAudioPrivateFunction {
175 WebrtcAudioPrivateGetAssociatedSinkFunction();
178 virtual ~WebrtcAudioPrivateGetAssociatedSinkFunction();
181 DECLARE_EXTENSION_FUNCTION("webrtcAudioPrivate.getAssociatedSink",
182 WEBRTC_AUDIO_PRIVATE_GET_ASSOCIATED_SINK);
184 virtual bool RunImpl() OVERRIDE;
186 // This implementation is slightly complicated because of different
187 // thread requirements for the various functions we need to invoke.
189 // Each worker function will post a task to the appropriate thread
192 // The sequence of events is:
193 // 1. Get the list of source devices on the device thread.
194 // 2. Given a source ID for an origin and that security origin, find
195 // the raw source ID. This needs to happen on the IO thread since
196 // we will be using the ResourceContext.
197 // 3. Given a raw source ID, get the raw associated sink ID on the
199 // 4. Given the raw associated sink ID, get its HMAC on the IO thread.
200 // 5. Respond with the HMAC of the associated sink ID on the UI thread.
202 // Fills in |source_devices_|. Note that these are input devices,
203 // not output devices, so don't use
204 // |WebrtcAudioPrivateFunction::GetOutputDeviceNames|.
205 void GetDevicesOnDeviceThread();
207 // Takes the parameters of the function, retrieves the raw source
208 // device ID, or the empty string if none.
209 void GetRawSourceIDOnIOThread();
211 // Gets the raw sink ID for a raw source ID. Sends it to |CalculateHMAC|.
212 void GetAssociatedSinkOnDeviceThread(const std::string& raw_source_id);
214 // Receives the associated sink ID after its HMAC is calculated.
215 virtual void OnHMACCalculated(const std::string& hmac) OVERRIDE;
217 // Accessed from UI thread and device thread, but only on one at a
218 // time, no locking needed.
219 scoped_ptr<api::webrtc_audio_private::GetAssociatedSink::Params> params_;
221 // Audio sources (input devices). Filled in by DoWorkOnDeviceThread.
222 media::AudioDeviceNames source_devices_;
225 } // namespace extensions
227 #endif // CHROME_BROWSER_EXTENSIONS_API_WEBRTC_AUDIO_PRIVATE_WEBRTC_AUDIO_PRIVATE_API_H_