Desktop chrome tab capture-chooseDesktopMedia()

content/browser/media/capture/web_contents_capture_util.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/media/capture/web_contents_capture_util.h"
-
-#include "base/basictypes.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_piece.h"
-#include "base/strings/string_util.h"
-
-namespace content {
-
-bool WebContentsCaptureUtil::IsWebContentsDeviceId(
-    const std::string& device_id) {
-  int ignored;
-  return ExtractTabCaptureTarget(device_id, &ignored, &ignored);
-}
-
-bool WebContentsCaptureUtil::ExtractTabCaptureTarget(
-    const std::string& device_id_param,
-    int* render_process_id,
-    int* main_render_frame_id) {
-  static const char kDeviceScheme[] = "web-contents-media-stream://";
-  if (!base::StartsWith(device_id_param, kDeviceScheme,
-                        base::CompareCase::SENSITIVE))
-    return false;
-
-  const std::string device_id = device_id_param.substr(
-      arraysize(kDeviceScheme) - 1);
-
-  const size_t sep_pos = device_id.find(':');
-  if (sep_pos == std::string::npos)
-    return false;
-
-  const base::StringPiece component1(device_id.data(), sep_pos);
-  size_t end_pos = device_id.find('?');
-  if (end_pos == std::string::npos)
-    end_pos = device_id.length();
-  const base::StringPiece component2(device_id.data() + sep_pos + 1,
-                                     end_pos - sep_pos - 1);
-
-  return (base::StringToInt(component1, render_process_id) &&
-          base::StringToInt(component2, main_render_frame_id));
-}
-
-bool WebContentsCaptureUtil::IsAutoThrottlingOptionSet(
-    const std::string& device_id) {
-  if (!IsWebContentsDeviceId(device_id))
-    return false;
-
-  // Find the option part of the string and just do a naive string compare since
-  // there are no other options in the |device_id| to account for (at the time
-  // of this writing).
-  const size_t option_pos = device_id.find('?');
-  if (option_pos == std::string::npos)
-    return false;
-  const base::StringPiece component(device_id.data() + option_pos,
-                                    device_id.length() - option_pos);
-  static const char kEnableFlag[] = "?throttling=auto";
-  return component.compare(kEnableFlag) == 0;
-}
-
-}  // namespace content