Media Capture Depth Stream Extensions API: focal length and depth range.

media/capture/video/fake_video_capture_device_factory.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 "media/capture/video/fake_video_capture_device_factory.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "media/base/media_switches.h"
 
 namespace {
 
+static const size_t kDepthDeviceIndex = 1;
+static const char kDepthDeviceId[] = "/dev/video1";
+
 // Factory has one device by default; I420. If there are more, the second device
 // is of Y16 format while the rest are I420.
 media::VideoPixelFormat GetPixelFormat(const std::string& device_id) {
-  return (device_id == "/dev/video1") ? media::PIXEL_FORMAT_Y16
-                                      : media::PIXEL_FORMAT_I420;
+  return (device_id == kDepthDeviceId) ? media::PIXEL_FORMAT_Y16
+                                       : media::PIXEL_FORMAT_I420;
 }
 }
 
 namespace media {
 
 // Cap the frame rate command line input to reasonable values.
 static const float kFakeCaptureMinFrameRate = 5.0f;
 static const float kFakeCaptureMaxFrameRate = 60.0f;
 // Default rate if none is specified as part of the command line.
 static const float kFakeCaptureDefaultFrameRate = 20.0f;
@@ skipping 42 matching lines @@
                                      VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE
 #elif defined(OS_MACOSX)
                                      VideoCaptureApi::MACOSX_AVFOUNDATION
 #elif defined(OS_WIN)
                                      VideoCaptureApi::WIN_DIRECT_SHOW
 #elif defined(OS_ANDROID)
                                      VideoCaptureApi::ANDROID_API2_LEGACY
 #endif
                                      );
   }
+
+  // Video device on index 1 (kDepthDeviceIndex) is depth video capture device.
+  // Fill the camera calibration information only for it.
+  if (device_descriptors->size() <= kDepthDeviceIndex)
+    return;
+  VideoCaptureDeviceDescriptor& depth_device(
+      (*device_descriptors)[kDepthDeviceIndex]);
+  depth_device.camera_calibration.emplace();
+  depth_device.camera_calibration->focal_length_x = 135.0;
+  depth_device.camera_calibration->focal_length_y = 135.6;
+  depth_device.camera_calibration->depth_near = 0.0;
+  depth_device.camera_calibration->depth_far = 65.535;
 }
 
 void FakeVideoCaptureDeviceFactory::GetSupportedFormats(
     const VideoCaptureDeviceDescriptor& device_descriptor,
     VideoCaptureFormats* supported_formats) {
   DCHECK(thread_checker_.CalledOnValidThread());
   const gfx::Size supported_sizes[] = {
       gfx::Size(96, 96), gfx::Size(320, 240), gfx::Size(640, 480),
       gfx::Size(1280, 720), gfx::Size(1920, 1080)};
   supported_formats->clear();
@@ skipping 41 matching lines @@
       if (base::StringToUint(param.back(), &count)) {
         number_of_devices_ = std::min(
             kFakeCaptureMaxDeviceCount,
             std::max(kFakeCaptureMinDeviceCount, static_cast<int>(count)));
       }
     }
   }
 }
 
 }  // namespace media