Add chrome.webcamPrivate idl

chrome/browser/extensions/api/webcam_private/webcam_private_api.cc

+// Copyright 2014 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 "chrome/browser/extensions/api/webcam_private/webcam_private_api.h"
+
+#include "chrome/common/extensions/api/webcam_private.h"
+
+#include "content/browser/browser_main_loop.h"
+#include "content/public/common/media_stream_request.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/resource_context.h"
+#include "content/browser/renderer_host/media/media_stream_manager.h"
+
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/videodev2.h>
+
+namespace {
+int OpenWebcam(const std::string& extension_id,
+               content::BrowserContext* browser_context,
+               const std::string& webcam_id) {
+  content::MediaStreamManager* manager =
+      content::BrowserMainLoop::GetInstance()->media_stream_manager();
+
+  GURL security_origin =
+      extensions::Extension::GetBaseURLFromExtensionId(extension_id);
+
+  std::string device_id;
+  bool success = manager->TranslateSourceIdToDeviceId(
+      content::MEDIA_DEVICE_VIDEO_CAPTURE,
+      browser_context->GetResourceContext()->GetMediaDeviceIDSalt(),
+      security_origin,
+      webcam_id,
+      &device_id);
+
+  if (!success)
+    return -1;
+
+  return open(device_id.c_str(), 0);
+}
+
+const char kUnknownWebcam[] = "Unknown webcam id";
+const char kCommandFailed[] = "Failed to send command to webcam";
+} // namespace
+
+namespace extensions {
+
+WebcamPrivateSetFunction::WebcamPrivateSetFunction() {
+}
+
+WebcamPrivateSetFunction::~WebcamPrivateSetFunction() {
+}
+
+bool WebcamPrivateSetFunction::RunImpl() {
+  // Get parameters
+  scoped_ptr<api::webcam_private::Set::Params> params(
+      api::webcam_private::Set::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+
+  int fd = OpenWebcam(extension_id(), browser_context(), params->webcam_id);
+  if (fd < 0) {
+    SetError(kUnknownWebcam);
+    return false;
+  }
+
+  struct v4l2_control v4l2_ctrl;
+  v4l2_ctrl.id = V4L2_CID_ZOOM_ABSOLUTE;
+  v4l2_ctrl.value = *(params->config.zoom);
+
+  if (ioctl(fd, VIDIOC_S_CTRL, &v4l2_ctrl)) {
+    SetError(kCommandFailed);
+    return false;
+  }
+
+  close(fd);
+
+  return true;
+}
+
+WebcamPrivateGetFunction::WebcamPrivateGetFunction() {
+}
+
+WebcamPrivateGetFunction::~WebcamPrivateGetFunction() {
+}
+
+bool WebcamPrivateGetFunction::RunImpl() {
+  // Get parameters
+  scoped_ptr<api::webcam_private::Get::Params> params(
+      api::webcam_private::Get::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+
+  int fd = OpenWebcam(extension_id(), browser_context(), params->webcam_id);
+  if (fd < 0) {
+    SetError(kUnknownWebcam);
+    return false;
+  }
+
+  struct v4l2_control v4l2_ctrl;
+  v4l2_ctrl.id = V4L2_CID_ZOOM_ABSOLUTE;
+
+  if (ioctl(fd, VIDIOC_G_CTRL, &v4l2_ctrl)) {
+    SetError(kCommandFailed);
+    return false;
+  }
+
+  close(fd);
+
+  api::webcam_private::WebcamConfiguration result;
+  result.zoom = make_scoped_ptr(new double(v4l2_ctrl.value));

[not at google - send to devlin, 2014/04/10 20:06:00]

result.zoom.reset(new double(..)) would be slightly more concise.

+  SetResult(result.ToValue().release());
+
+  return true;
+}
+
+WebcamPrivateResetFunction::WebcamPrivateResetFunction() {
+}
+
+WebcamPrivateResetFunction::~WebcamPrivateResetFunction() {
+}
+
+bool WebcamPrivateResetFunction::RunImpl() {
+  // Get parameters
+  scoped_ptr<api::webcam_private::Reset::Params> params(
+      api::webcam_private::Reset::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+
+  int fd = OpenWebcam(extension_id(), browser_context(), params->webcam_id);
+  if (fd < 0) {
+    SetError(kUnknownWebcam);
+    return false;
+  }
+
+  struct v4l2_control v4l2_ctrl;
+  v4l2_ctrl.id = V4L2_CID_ZOOM_ABSOLUTE;
+  v4l2_ctrl.value = 100;
+
+  if (ioctl(fd, VIDIOC_S_CTRL, &v4l2_ctrl)) {
+    SetError(kCommandFailed);
+    return false;
+  }
+
+  close(fd);
+
+  return true;
+}
+
+}  // namespace extensions