Camera: add webcam HAL@3.6 support

First CL to setup webcam HAL to support HIDL camera device 3.6.
Follow up CL will add actual offline processing capability.

Test: TestingCamera.apk
Bug: 135142453
Change-Id: Ifcd1b22f42d08b0fa5dc6039125c1d979b8104c2
diff --git a/camera/device/3.6/default/ExternalCameraDeviceSession.cpp b/camera/device/3.6/default/ExternalCameraDeviceSession.cpp
new file mode 100644
index 0000000..e14ae99
--- /dev/null
+++ b/camera/device/3.6/default/ExternalCameraDeviceSession.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#define LOG_TAG "ExtCamDevSsn@3.6"
+#include <android/log.h>
+
+#include <utils/Trace.h>
+#include "ExternalCameraDeviceSession.h"
+
+namespace android {
+namespace hardware {
+namespace camera {
+namespace device {
+namespace V3_6 {
+namespace implementation {
+
+ExternalCameraDeviceSession::ExternalCameraDeviceSession(
+        const sp<V3_2::ICameraDeviceCallback>& callback,
+        const ExternalCameraConfig& cfg,
+        const std::vector<SupportedV4L2Format>& sortedFormats,
+        const CroppingType& croppingType,
+        const common::V1_0::helper::CameraMetadata& chars,
+        const std::string& cameraId,
+        unique_fd v4l2Fd) :
+        V3_5::implementation::ExternalCameraDeviceSession(
+                callback, cfg, sortedFormats, croppingType, chars, cameraId, std::move(v4l2Fd)) {
+}
+
+ExternalCameraDeviceSession::~ExternalCameraDeviceSession() {}
+
+
+Return<void> ExternalCameraDeviceSession::configureStreams_3_6(
+        const StreamConfiguration& requestedConfiguration,
+        ICameraDeviceSession::configureStreams_3_6_cb _hidl_cb)  {
+    V3_2::StreamConfiguration config_v32;
+    V3_3::HalStreamConfiguration outStreams_v33;
+    V3_6::HalStreamConfiguration outStreams;
+    const V3_4::StreamConfiguration& requestedConfiguration_3_4 = requestedConfiguration.v3_4;
+    Mutex::Autolock _il(mInterfaceLock);
+
+    config_v32.operationMode = requestedConfiguration_3_4.operationMode;
+    config_v32.streams.resize(requestedConfiguration_3_4.streams.size());
+    uint32_t blobBufferSize = 0;
+    int numStallStream = 0;
+    for (size_t i = 0; i < config_v32.streams.size(); i++) {
+        config_v32.streams[i] = requestedConfiguration_3_4.streams[i].v3_2;
+        if (config_v32.streams[i].format == PixelFormat::BLOB) {
+            blobBufferSize = requestedConfiguration_3_4.streams[i].bufferSize;
+            numStallStream++;
+        }
+    }
+
+    // Fail early if there are multiple BLOB streams
+    if (numStallStream > kMaxStallStream) {
+        ALOGE("%s: too many stall streams (expect <= %d, got %d)", __FUNCTION__,
+                kMaxStallStream, numStallStream);
+        _hidl_cb(Status::ILLEGAL_ARGUMENT, outStreams);
+        return Void();
+    }
+
+    Status status = configureStreams(config_v32, &outStreams_v33, blobBufferSize);
+
+    outStreams.streams.resize(outStreams_v33.streams.size());
+    for (size_t i = 0; i < outStreams.streams.size(); i++) {
+        outStreams.streams[i].v3_4.v3_3 = outStreams_v33.streams[i];
+        // TODO: implement it later
+        outStreams.streams[i].supportOffline = false;
+    }
+    _hidl_cb(status, outStreams);
+    return Void();
+}
+
+Return<void> ExternalCameraDeviceSession::switchToOffline(
+        const hidl_vec<int32_t>& streamsToKeep,
+        ICameraDeviceSession::switchToOffline_cb _hidl_cb) {
+    // TODO: implement this
+    (void) streamsToKeep;
+    (void) _hidl_cb;
+    return Void();
+}
+
+} // namespace implementation
+}  // namespace V3_6
+}  // namespace device
+}  // namespace camera
+}  // namespace hardware
+}  // namespace android