Add setHome method to webcam.h

Add method to all implementing classes.
See go/hotrodsethome for more details.

Bug: b:139706624
Change-Id: I7d884e259135b46715e1dbceda6e8aa85a7c32fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917970
Commit-Queue: Juan Pablo De Lima <jpdelima@chromium.org>
Reviewed-by: Zachary Kuznia <zork@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723527}

extensions/browser/api/webcam_private/v4l2_webcam.cc

@@ -14,6 +14,7 @@
 
 #include "base/posix/eintr_wrapper.h"
 #include "base/stl_util.h"
+#include "base/logging.h"
 
 #define V4L2_CID_PAN_SPEED (V4L2_CID_CAMERA_CLASS_BASE+32)
 #define V4L2_CID_TILT_SPEED (V4L2_CID_CAMERA_CLASS_BASE+33)
@@ -40,7 +41,9 @@
 
 namespace {
 const int kLogitechMenuIndexGoHome = 2;
+const int kLogitechMenuIndexSetHome = 0;
 const int kAverMenuIndexGoHome = 1;
+const int kAverMenuIndexSetHome = 0;
 
 const uvc_menu_info kLogitechCmdMenu[] = {
   {1, "Set Preset"}, {2, "Get Preset"}, {3, "Go Home"}
@@ -287,6 +290,31 @@ void V4L2Webcam::SetTiltDirection(TiltDirection direction,
       SetWebcamParameter(fd_.get(), V4L2_CID_TILT_SPEED, direction_value));
 }
 
+void V4L2Webcam::SetHome(const SetPTZCompleteCallback& callback) {
+  if (EnsureLogitechCommandsMapped()) {
+    if (!SetWebcamParameter(fd_.get(), V4L2_CID_PANTILT_CMD,
+                            kLogitechMenuIndexSetHome)) {
+      LOG(WARNING) << "Failed to set HOME preset for Logitech webcam";
+      callback.Run(false);
+      return;
+    }
+    callback.Run(true);
+    return;
+  }
+  if (EnsureAverCommandsMapped()) {
+    if (!SetWebcamParameter(fd_.get(), V4L2_CID_PANTILT_CMD,
+                            kAverMenuIndexSetHome)) {
+      LOG(WARNING) << "Failed to set HOME preset for AVer CAM webcam";
+      callback.Run(false);
+      return;
+    }
+    callback.Run(true);
+    return;
+  }
+  LOG(WARNING) << "Active webcam does not currently support seting HOME preset";
+  callback.Run(false);
+}
+
 void V4L2Webcam::Reset(bool pan,
                        bool tilt,
                        bool zoom,

extensions/browser/api/webcam_private/v4l2_webcam.h

@@ -52,6 +52,7 @@ class V4L2Webcam : public Webcam {
              bool tilt,
              bool zoom,
              const SetPTZCompleteCallback& callback) override;
+  void SetHome(const SetPTZCompleteCallback& callback) override;
   void SetFocus(int value, const SetPTZCompleteCallback& callback) override;
   void SetAutofocusState(AutofocusState state,
                          const SetPTZCompleteCallback& callback) override;

extensions/browser/api/webcam_private/visca_webcam.cc

@@ -504,6 +504,8 @@ void ViscaWebcam::Reset(bool pan,
   }
 }
 
+void ViscaWebcam::SetHome(const SetPTZCompleteCallback& callback) {}
+
 void ViscaWebcam::OpenForTesting(
     std::unique_ptr<SerialConnection> serial_connection) {
   serial_connection_ = std::move(serial_connection);

extensions/browser/api/webcam_private/visca_webcam.h

@@ -114,6 +114,7 @@ class ViscaWebcam : public Webcam {
              bool tilt,
              bool zoom,
              const SetPTZCompleteCallback& callback) override;
+  void SetHome(const SetPTZCompleteCallback& callback) override;
   void SetFocus(int value, const SetPTZCompleteCallback& callback) override;
   void SetAutofocusState(AutofocusState state,
                          const SetPTZCompleteCallback& callback) override;

extensions/browser/api/webcam_private/webcam.h

@@ -65,6 +65,8 @@ class Webcam : public base::RefCounted<Webcam> {
                      bool zoom,
                      const SetPTZCompleteCallback& callback) = 0;
 
+  virtual void SetHome(const SetPTZCompleteCallback& callback) = 0;
+
  protected:
   friend class base::RefCounted<Webcam>;
   virtual ~Webcam();