gecko/dom/camera/GonkCameraManager.cpp

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/*
* Copyright (C) 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <camera/Camera.h>
#include "jsapi.h"
#include "GonkCameraControl.h"
#include "DOMCameraManager.h"
#include "CameraCommon.h"
// From nsDOMCameraManager, but gonk-specific!
nsresult
nsDOMCameraManager::GetNumberOfCameras(int32_t& aDeviceCount)
{
aDeviceCount = android::Camera::getNumberOfCameras();
return NS_OK;
}
nsresult
nsDOMCameraManager::GetCameraName(uint32_t aDeviceNum, nsCString& aDeviceName)
{
int32_t count = android::Camera::getNumberOfCameras();
DOM_CAMERA_LOGI("GetCameraName : getNumberOfCameras() returned %d\n", count);
if (aDeviceNum > count) {
DOM_CAMERA_LOGE("GetCameraName : invalid device number");
return NS_ERROR_NOT_AVAILABLE;
}
android::CameraInfo info;
int rv = android::Camera::getCameraInfo(aDeviceNum, &info);
if (rv != 0) {
DOM_CAMERA_LOGE("GetCameraName : get_camera_info(%d) failed: %d\n", aDeviceNum, rv);
return NS_ERROR_NOT_AVAILABLE;
}
switch (info.facing) {
case CAMERA_FACING_BACK:
aDeviceName.Assign("back");
break;
case CAMERA_FACING_FRONT:
aDeviceName.Assign("front");
break;
default:
aDeviceName.Assign("extra-camera-");
aDeviceName.AppendInt(aDeviceNum);
break;
}
return NS_OK;
}
/* void getListOfCameras ([optional] out unsigned long aCount, [array, size_is (aCount), retval] out string aCameras); */
NS_IMETHODIMP
nsDOMCameraManager::GetListOfCameras(uint32_t *aCount, char * **aCameras)
{
int32_t count = android::Camera::getNumberOfCameras();
DOM_CAMERA_LOGI("GetListOfCameras : getNumberOfCameras() returned %d\n", count);
if (count < 1) {
*aCameras = nullptr;
*aCount = 0;
return NS_OK;
}
// Allocate 2 extra slots to reserve space for 'front' and 'back' cameras
// at the front of the array--we will collapse any empty slots below.
int32_t arraySize = count + 2;
char** cameras = static_cast<char**>(NS_Alloc(arraySize * sizeof(char*)));
for (int32_t i = 0; i < arraySize; ++i) {
cameras[i] = nullptr;
}
uint32_t extraIndex = 2;
bool gotFront = false;
bool gotBack = false;
for (int32_t i = 0; i < count; ++i) {
nsCString cameraName;
nsresult result = GetCameraName(i, cameraName);
if (result != NS_OK) {
continue;
}
// The first camera we find named 'back' gets slot 0; and the first
// we find named 'front' gets slot 1. All others appear after these.
uint32_t index;
if (!gotBack && !cameraName.Compare("back")) {
index = 0;
gotBack = true;
} else if (!gotFront && !cameraName.Compare("front")) {
index = 1;
gotFront = true;
} else {
index = extraIndex++;
}
MOZ_ASSERT(index < arraySize);
cameras[index] = ToNewCString(cameraName);
}
// Make a forward pass over the array to compact it; after this loop,
// 'offset' will contain the number of nullptrs in the array, which
// we use to adjust the value returned in 'aCount'.
int32_t offset = 0;
for (int32_t i = 0; i < arraySize; ++i) {
if (cameras[i] == nullptr) {
offset++;
} else if (offset != 0) {
cameras[i - offset] = cameras[i];
cameras[i] = nullptr;
}
}
MOZ_ASSERT(offset >= 2);
*aCameras = cameras;
*aCount = arraySize - offset;
return NS_OK;
}