diff --git a/camera/device/3.4/default/ExternalCameraDevice.cpp b/camera/device/3.4/default/ExternalCameraDevice.cpp
index f518a15..677b496 100644
--- a/camera/device/3.4/default/ExternalCameraDevice.cpp
+++ b/camera/device/3.4/default/ExternalCameraDevice.cpp
@@ -20,6 +20,7 @@
 
 #include <algorithm>
 #include <array>
+#include <regex>
 #include <linux/videodev2.h>
 #include "android-base/macros.h"
 #include "CameraMetadata.h"
@@ -46,10 +47,20 @@
 
 } // anonymous namespace
 
+const std::regex kDevicePathRE("/dev/video([0-9]+)");
+
 ExternalCameraDevice::ExternalCameraDevice(
-        const std::string& cameraId, const ExternalCameraConfig& cfg) :
-        mCameraId(cameraId),
-        mCfg(cfg) {}
+        const std::string& devicePath, const ExternalCameraConfig& cfg) :
+        mCameraId("-1"),
+        mDevicePath(devicePath),
+        mCfg(cfg) {
+    std::smatch sm;
+    if (std::regex_match(mDevicePath, sm, kDevicePathRE)) {
+        mCameraId = std::to_string(mCfg.cameraIdOffset + std::stoi(sm[1]));
+    } else {
+        ALOGE("%s: device path match failed for %s", __FUNCTION__, mDevicePath.c_str());
+    }
+}
 
 ExternalCameraDevice::~ExternalCameraDevice() {}
 
@@ -129,20 +140,20 @@
         return Void();
     }
 
-    unique_fd fd(::open(mCameraId.c_str(), O_RDWR));
+    unique_fd fd(::open(mDevicePath.c_str(), O_RDWR));
     if (fd.get() < 0) {
         int numAttempt = 0;
         do {
             ALOGW("%s: v4l2 device %s open failed, wait 33ms and try again",
-                    __FUNCTION__, mCameraId.c_str());
+                    __FUNCTION__, mDevicePath.c_str());
             usleep(OPEN_RETRY_SLEEP_US); // sleep and try again
-            fd.reset(::open(mCameraId.c_str(), O_RDWR));
+            fd.reset(::open(mDevicePath.c_str(), O_RDWR));
             numAttempt++;
         } while (fd.get() < 0 && numAttempt <= MAX_RETRY);
 
         if (fd.get() < 0) {
             ALOGE("%s: v4l2 device open %s failed: %s",
-                    __FUNCTION__, mCameraId.c_str(), strerror(errno));
+                    __FUNCTION__, mDevicePath.c_str(), strerror(errno));
             mLock.unlock();
             _hidl_cb(Status::INTERNAL_ERROR, nullptr);
             return Void();
@@ -203,9 +214,9 @@
 status_t ExternalCameraDevice::initCameraCharacteristics() {
     if (mCameraCharacteristics.isEmpty()) {
         // init camera characteristics
-        unique_fd fd(::open(mCameraId.c_str(), O_RDWR));
+        unique_fd fd(::open(mDevicePath.c_str(), O_RDWR));
         if (fd.get() < 0) {
-            ALOGE("%s: v4l2 device open %s failed", __FUNCTION__, mCameraId.c_str());
+            ALOGE("%s: v4l2 device open %s failed", __FUNCTION__, mDevicePath.c_str());
             return DEAD_OBJECT;
         }
 
diff --git a/camera/device/3.4/default/ExternalCameraUtils.cpp b/camera/device/3.4/default/ExternalCameraUtils.cpp
index 62a4c87..8f4626c 100644
--- a/camera/device/3.4/default/ExternalCameraUtils.cpp
+++ b/camera/device/3.4/default/ExternalCameraUtils.cpp
@@ -703,6 +703,7 @@
 namespace common {
 
 namespace {
+    const int kDefaultCameraIdOffset = 100;
     const int kDefaultJpegBufSize = 5 << 20; // 5MB
     const int kDefaultNumVideoBuffer = 4;
     const int kDefaultNumStillBuffer = 2;
@@ -738,6 +739,11 @@
         return ret;
     }
 
+    XMLElement *cameraIdOffset = providerCfg->FirstChildElement("CameraIdOffset");
+    if (cameraIdOffset != nullptr) {
+        ret.cameraIdOffset = std::atoi(cameraIdOffset->GetText());
+    }
+
     XMLElement *ignore = providerCfg->FirstChildElement("ignore");
     if (ignore == nullptr) {
         ALOGI("%s: no internal ignored device specified", __FUNCTION__);
@@ -874,6 +880,7 @@
 }
 
 ExternalCameraConfig::ExternalCameraConfig() :
+        cameraIdOffset(kDefaultCameraIdOffset),
         maxJpegBufSize(kDefaultJpegBufSize),
         numVideoBuffers(kDefaultNumVideoBuffer),
         numStillBuffers(kDefaultNumStillBuffer),
diff --git a/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraDevice_3_4.h b/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraDevice_3_4.h
index 1958fcb..88726f4 100644
--- a/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraDevice_3_4.h
+++ b/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraDevice_3_4.h
@@ -149,6 +149,7 @@
     bool mInitialized = false;
     bool mInitFailed = false;
     std::string mCameraId;
+    std::string mDevicePath;
     const ExternalCameraConfig& mCfg;
     std::vector<SupportedV4L2Format> mSupportedFormats;
     CroppingType mCroppingType;
diff --git a/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraUtils.h b/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraUtils.h
index 74f75eb..b354406 100644
--- a/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraUtils.h
+++ b/camera/device/3.4/default/include/ext_device_v3_4_impl/ExternalCameraUtils.h
@@ -68,6 +68,9 @@
     static const char* kDefaultCfgPath;
     static ExternalCameraConfig loadFromCfg(const char* cfgPath = kDefaultCfgPath);
 
+    // CameraId base offset for numerical representation
+    uint32_t cameraIdOffset;
+
     // List of internal V4L2 video nodes external camera HAL must ignore.
     std::unordered_set<std::string> mInternalDevices;