extensions/browser/api/webcam_private/webcam_private_api_chromeos.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/browser/api/webcam_private/webcam_private_api.h"
   6
   7 #include <fcntl.h>
   8 #include <linux/videodev2.h>
   9 #include <stdio.h>
  10 #include <sys/ioctl.h>
  11 #include <unistd.h>
  12
  13 #include "base/files/scoped_file.h"
  14 #include "base/posix/eintr_wrapper.h"
  15 #include "content/public/browser/browser_context.h"
  16 #include "content/public/browser/media_device_id.h"
  17 #include "content/public/browser/resource_context.h"
  18 #include "content/public/common/media_stream_request.h"
  19 #include "extensions/common/api/webcam_private.h"
  20
  21 #define V4L2_CID_PAN_SPEED (V4L2_CID_CAMERA_CLASS_BASE+32)
  22 #define V4L2_CID_TILT_SPEED (V4L2_CID_CAMERA_CLASS_BASE+33)
  23
  24 namespace webcam_private = extensions::core_api::webcam_private;
  25
  26 namespace content {
  27 class BrowserContext;
  28 }  // namespace content
  29
  30 namespace {
  31
  32 base::ScopedFD OpenWebcam(const std::string& extension_id,
  33                           content::BrowserContext* browser_context,
  34                           const std::string& webcam_id) {
  35   GURL security_origin =
  36       extensions::Extension::GetBaseURLFromExtensionId(extension_id);
  37
  38   std::string device_id;
  39   bool success = content::GetMediaDeviceIDForHMAC(
  40       content::MEDIA_DEVICE_VIDEO_CAPTURE,
  41       browser_context->GetResourceContext()->GetMediaDeviceIDSalt(),
  42       security_origin,
  43       webcam_id,
  44       &device_id);
  45
  46   if (!success)
  47     return base::ScopedFD();
  48
  49   return base::ScopedFD(HANDLE_EINTR(open(device_id.c_str(), 0)));
  50 }
  51
  52 void SetWebcamParameter(int fd, uint32_t control_id, int value) {
  53   struct v4l2_control v4l2_ctrl = {control_id, value};
  54   HANDLE_EINTR(ioctl(fd, VIDIOC_S_CTRL, &v4l2_ctrl));
  55 }
  56
  57 bool GetWebcamParameter(int fd, uint32_t control_id, int* value) {
  58   struct v4l2_control v4l2_ctrl = {control_id};
  59
  60   if (HANDLE_EINTR(ioctl(fd, VIDIOC_G_CTRL, &v4l2_ctrl)))
  61     return false;
  62
  63   *value = v4l2_ctrl.value;
  64   return true;
  65 }
  66
  67 const char kUnknownWebcam[] = "Unknown webcam id";
  68 }  // namespace
  69
  70 namespace extensions {
  71
  72 WebcamPrivateSetFunction::WebcamPrivateSetFunction() {
  73 }
  74
  75 WebcamPrivateSetFunction::~WebcamPrivateSetFunction() {
  76 }
  77
  78 bool WebcamPrivateSetFunction::RunSync() {
  79   // Get parameters
  80   scoped_ptr<webcam_private::Set::Params> params(
  81       webcam_private::Set::Params::Create(*args_));
  82   EXTENSION_FUNCTION_VALIDATE(params.get());
  83
  84   base::ScopedFD fd =
  85       OpenWebcam(extension_id(), browser_context(), params->webcam_id);
  86   if (!fd.is_valid()) {
  87     SetError(kUnknownWebcam);
  88     return false;
  89   }
  90
  91   if (params->config.pan) {
  92     SetWebcamParameter(fd.get(), V4L2_CID_PAN_ABSOLUTE,
  93                        *(params->config.pan));
  94   }
  95
  96   if (params->config.pan_direction) {
  97     int direction = 0;
  98     switch (params->config.pan_direction) {
  99       case webcam_private::PAN_DIRECTION_NONE:
 100       case webcam_private::PAN_DIRECTION_STOP:
 101         direction = 0;
 102         break;
 103
 104       case webcam_private::PAN_DIRECTION_RIGHT:
 105         direction = 1;
 106         break;
 107
 108       case webcam_private::PAN_DIRECTION_LEFT:
 109         direction = -1;
 110         break;
 111     }
 112     SetWebcamParameter(fd.get(), V4L2_CID_PAN_SPEED, direction);
 113   }
 114
 115   if (params->config.tilt) {
 116     SetWebcamParameter(fd.get(), V4L2_CID_TILT_ABSOLUTE,
 117                        *(params->config.tilt));
 118   }
 119
 120   if (params->config.tilt_direction) {
 121     int direction = 0;
 122     switch (params->config.tilt_direction) {
 123       case webcam_private::TILT_DIRECTION_NONE:
 124       case webcam_private::TILT_DIRECTION_STOP:
 125         direction = 0;
 126         break;
 127
 128       case webcam_private::TILT_DIRECTION_UP:
 129         direction = 1;
 130         break;
 131
 132       case webcam_private::TILT_DIRECTION_DOWN:
 133         direction = -1;
 134         break;
 135     }
 136     SetWebcamParameter(fd.get(), V4L2_CID_TILT_SPEED, direction);
 137   }
 138
 139   if (params->config.zoom) {
 140     SetWebcamParameter(fd.get(), V4L2_CID_ZOOM_ABSOLUTE,
 141                        *(params->config.zoom));
 142   }
 143
 144
 145   return true;
 146 }
 147
 148 WebcamPrivateGetFunction::WebcamPrivateGetFunction() {
 149 }
 150
 151 WebcamPrivateGetFunction::~WebcamPrivateGetFunction() {
 152 }
 153
 154 bool WebcamPrivateGetFunction::RunSync() {
 155   // Get parameters
 156   scoped_ptr<webcam_private::Get::Params> params(
 157       webcam_private::Get::Params::Create(*args_));
 158   EXTENSION_FUNCTION_VALIDATE(params.get());
 159
 160   base::ScopedFD fd =
 161       OpenWebcam(extension_id(), browser_context(), params->webcam_id);
 162   if (!fd.is_valid()) {
 163     SetError(kUnknownWebcam);
 164     return false;
 165   }
 166
 167   webcam_private::WebcamConfiguration result;
 168
 169   int pan;
 170   if (GetWebcamParameter(fd.get(), V4L2_CID_PAN_ABSOLUTE, &pan))
 171     result.pan.reset(new double(pan));
 172
 173   int tilt;
 174   if (GetWebcamParameter(fd.get(), V4L2_CID_TILT_ABSOLUTE, &tilt))
 175     result.tilt.reset(new double(tilt));
 176
 177   int zoom;
 178   if (GetWebcamParameter(fd.get(), V4L2_CID_ZOOM_ABSOLUTE, &zoom))
 179     result.zoom.reset(new double(zoom));
 180
 181   SetResult(result.ToValue().release());
 182
 183   return true;
 184 }
 185
 186 WebcamPrivateResetFunction::WebcamPrivateResetFunction() {
 187 }
 188
 189 WebcamPrivateResetFunction::~WebcamPrivateResetFunction() {
 190 }
 191
 192 bool WebcamPrivateResetFunction::RunSync() {
 193   // Get parameters
 194   scoped_ptr<webcam_private::Reset::Params> params(
 195       webcam_private::Reset::Params::Create(*args_));
 196   EXTENSION_FUNCTION_VALIDATE(params.get());
 197
 198   base::ScopedFD fd =
 199       OpenWebcam(extension_id(), browser_context(), params->webcam_id);
 200   if (!fd.is_valid()) {
 201     SetError(kUnknownWebcam);
 202     return false;
 203   }
 204
 205   if (params->config.pan) {
 206     struct v4l2_control v4l2_ctrl = {V4L2_CID_PAN_RESET};
 207     HANDLE_EINTR(ioctl(fd.get(), VIDIOC_S_CTRL, &v4l2_ctrl));
 208   }
 209
 210   if (params->config.tilt) {
 211     struct v4l2_control v4l2_ctrl = {V4L2_CID_TILT_RESET};
 212     HANDLE_EINTR(ioctl(fd.get(), VIDIOC_S_CTRL, &v4l2_ctrl));
 213   }
 214
 215   if (params->config.zoom) {
 216     const int kDefaultZoom = 100;
 217     SetWebcamParameter(fd.get(), V4L2_CID_ZOOM_ABSOLUTE, kDefaultZoom);
 218   }
 219
 220   return true;
 221 }
 222
 223 }  // namespace extensions