Pass camera facing info to audio client

content/browser/renderer_host/media/video_capture_manager.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/media/video_capture_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 16 matching lines @@
 #include "content/browser/media/media_internals.h"
 #include "content/browser/renderer_host/media/video_capture_controller.h"
 #include "content/browser/renderer_host/media/video_capture_controller_event_handler.h"
 #include "content/browser/renderer_host/media/video_capture_gpu_jpeg_decoder.h"
 #include "content/browser/renderer_host/media/video_frame_receiver_on_io_thread.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/desktop_media_id.h"
 #include "content/public/common/media_stream_request.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/media_switches.h"
+#include "media/base/video_facing.h"
 #include "media/capture/video/video_capture_buffer_pool_impl.h"
 #include "media/capture/video/video_capture_buffer_tracker_factory_impl.h"
 #include "media/capture/video/video_capture_device.h"
 #include "media/capture/video/video_capture_device_client.h"
 #include "media/capture/video/video_capture_device_factory.h"
 
 #if defined(ENABLE_SCREEN_CAPTURE)
 
 #if BUILDFLAG(ENABLE_WEBRTC) && !defined(OS_ANDROID)
 #include "content/browser/media/capture/desktop_capture_device.h"
@@ skipping 283 matching lines @@
     std::unique_ptr<media::VideoCaptureDeviceFactory> factory)
     : listener_(nullptr),
       new_capture_session_id_(1),
       video_capture_device_factory_(std::move(factory)) {}
 
 VideoCaptureManager::~VideoCaptureManager() {
   DCHECK(devices_.empty());
   DCHECK(device_start_queue_.empty());
 }
 
+void VideoCaptureManager::AddVideoCaptureObserver(
+    media::VideoCaptureObserver* observer) {
+  if (observer != nullptr)

[jennyz, 2017/02/09 19:42:55]

client code is not supposed to call this function passing a nullptr, what about
using a DCHECK to guard?

[shenghao, 2017/02/09 22:32:51]

Done.

+    capture_observers_.push_back(observer);
+}
+
+void VideoCaptureManager::RemoveAllVideoCaptureObservers() {
+  capture_observers_.clear();
+}
+
 void VideoCaptureManager::Register(
     MediaStreamProviderListener* listener,
     const scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!listener_);
   DCHECK(!device_task_runner_.get());
   listener_ = listener;
   device_task_runner_ = device_task_runner;
 #if defined(OS_ANDROID)
   application_state_has_running_activities_ = true;
@@ skipping 110 matching lines @@
            device_start_queue_.rbegin();
        request != device_start_queue_.rend(); ++request) {
     if (request->serial_id() == entry->serial_id) {
       request->set_abort_start();
       DVLOG(3) << "DoStopDevice, aborting start request for device "
                << entry->id << " serial_id = " << entry->serial_id;
       return;
     }
   }
 
+  const DeviceInfo* device_info = GetDeviceInfoById(entry->id);
+  if (device_info != nullptr) {
+    for (auto& observer : capture_observers_)
+      observer->OnVideoCaptureStopped(device_info->descriptor.facing);
+  }
+
   DVLOG(3) << "DoStopDevice. Send stop request for device = " << entry->id
            << " serial_id = " << entry->serial_id << ".";
   entry->video_capture_controller.OnLog(
       base::StringPrintf("Stopping device: id: %s", entry->id.c_str()));
   entry->video_capture_controller.SetConsumerFeedbackObserver(nullptr);
   entry->video_capture_controller.SetFrameBufferPool(nullptr);
 
   // |entry->video_capture_device| can be null if creating the device has
   // failed.
   if (entry->video_capture_device) {
@@ skipping 36 matching lines @@
       // since the renderer does not have all the information that might be
       // held in the browser-side VideoCaptureDevice::Name structure.
       const DeviceInfo* found = GetDeviceInfoById(entry->id);
       if (found) {
         entry->video_capture_controller.OnLog(
             base::StringPrintf("Starting device: id: %s, name: %s, api: %s",
                                found->descriptor.device_id.c_str(),
                                found->descriptor.GetNameAndModel().c_str(),
                                found->descriptor.GetCaptureApiTypeString()));
 
+        for (auto& observer : capture_observers_)
+          observer->OnVideoCaptureStarted(found->descriptor.facing);
+
         start_capture_function =
             base::Bind(&VideoCaptureManager::DoStartDeviceCaptureOnDeviceThread,
                        this, found->descriptor, request->params(),
                        base::Passed(std::move(device_client)));
       } else {
         // Errors from DoStartDeviceCaptureOnDeviceThread go via
         // VideoCaptureDeviceClient::OnError, which needs some thread
         // dancing to get errors processed on the IO thread. But since
         // we're on that thread, we call VideoCaptureController
         // methods directly.
@@ skipping 802 matching lines @@
     if (!device_in_queue) {
       // Session ID is only valid for Screen capture. So we can fake it to
       // resume video capture devices here.
       QueueStartDevice(kFakeSessionId, entry.get(), entry->parameters);
     }
   }
 }
 #endif  // defined(OS_ANDROID)
 
 }  // namespace content