Initial camera device implementation
* Working streaming preview requests only
* Almost everything else returns empty objects that don't do anything
Bug: 9213377
Change-Id: Ie6f02a7c0952b0f5ebc41905425b15cae221f7d3
diff --git a/core/jni/android_hardware_photography_CameraMetadata.cpp b/core/jni/android_hardware_photography_CameraMetadata.cpp
new file mode 100644
index 0000000..fa363f3
--- /dev/null
+++ b/core/jni/android_hardware_photography_CameraMetadata.cpp
@@ -0,0 +1,271 @@
+/*
+**
+** Copyright 2013, 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_NDEBUG 0
+#define LOG_TAG "CameraMetadata-JNI"
+#include <utils/Log.h>
+
+#include "jni.h"
+#include "JNIHelp.h"
+#include "android_os_Parcel.h"
+#include "android_runtime/AndroidRuntime.h"
+
+#include <camera/CameraMetadata.h>
+
+// fully-qualified class name
+#define CAMERA_METADATA_CLASS_NAME "android/hardware/photography/CameraMetadata"
+
+using namespace android;
+
+struct fields_t {
+ jfieldID metadata_ptr;
+};
+
+static fields_t fields;
+
+extern "C" {
+
+static void CameraMetadata_classInit(JNIEnv *env, jobject thiz);
+
+// Less safe access to native pointer. Does NOT throw any Java exceptions if NULL.
+static CameraMetadata* CameraMetadata_getPointerNoThrow(JNIEnv *env, jobject thiz) {
+
+ if (thiz == NULL) {
+ return NULL;
+ }
+
+ return reinterpret_cast<CameraMetadata*>(env->GetLongField(thiz, fields.metadata_ptr));
+}
+
+// Safe access to native pointer from object. Throws if not possible to access.
+static CameraMetadata* CameraMetadata_getPointerThrow(JNIEnv *env, jobject thiz,
+ const char* argName = "this") {
+
+ if (thiz == NULL) {
+ ALOGV("%s: Throwing java.lang.NullPointerException for null reference",
+ __FUNCTION__);
+ jniThrowNullPointerException(env, argName);
+ return NULL;
+ }
+
+ CameraMetadata* metadata = CameraMetadata_getPointerNoThrow(env, thiz);
+ if (metadata == NULL) {
+ ALOGV("%s: Throwing java.lang.IllegalStateException for closed object",
+ __FUNCTION__);
+ jniThrowException(env, "java/lang/IllegalStateException",
+ "Metadata object was already closed");
+ return NULL;
+ }
+
+ return metadata;
+}
+
+static jlong CameraMetadata_allocate(JNIEnv *env, jobject thiz) {
+ ALOGV("%s", __FUNCTION__);
+
+ return reinterpret_cast<jlong>(new CameraMetadata());
+}
+
+static jboolean CameraMetadata_isEmpty(JNIEnv *env, jobject thiz) {
+ ALOGV("%s", __FUNCTION__);
+
+ CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz);
+
+ if (metadata == NULL) {
+ ALOGW("%s: Returning early due to exception being thrown",
+ __FUNCTION__);
+ return JNI_TRUE; // actually throws java exc.
+ }
+
+ jboolean empty = metadata->isEmpty();
+
+ ALOGV("%s: Empty returned %d, entry count was %d",
+ __FUNCTION__, empty, metadata->entryCount());
+
+ return empty;
+}
+
+static jint CameraMetadata_getEntryCount(JNIEnv *env, jobject thiz) {
+ ALOGV("%s", __FUNCTION__);
+
+ CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz);
+
+ if (metadata == NULL) return 0; // actually throws java exc.
+
+ return metadata->entryCount();
+}
+
+// idempotent. calling more than once has no effect.
+static void CameraMetadata_close(JNIEnv *env, jobject thiz) {
+ ALOGV("%s", __FUNCTION__);
+
+ CameraMetadata* metadata = CameraMetadata_getPointerNoThrow(env, thiz);
+
+ if (metadata != NULL) {
+ delete metadata;
+ env->SetLongField(thiz, fields.metadata_ptr, 0);
+ }
+
+ LOG_ALWAYS_FATAL_IF(CameraMetadata_getPointerNoThrow(env, thiz) != NULL,
+ "Expected the native ptr to be 0 after #close");
+}
+
+static void CameraMetadata_swap(JNIEnv *env, jobject thiz, jobject other) {
+ ALOGV("%s", __FUNCTION__);
+
+ CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz);
+
+ // order is important: we can't call another JNI method
+ // if there is an exception pending
+ if (metadata == NULL) return;
+
+ CameraMetadata* otherMetadata = CameraMetadata_getPointerThrow(env, other, "other");
+
+ if (otherMetadata == NULL) return;
+
+ metadata->swap(*otherMetadata);
+}
+
+static void CameraMetadata_readFromParcel(JNIEnv *env, jobject thiz, jobject parcel) {
+ ALOGV("%s", __FUNCTION__);
+ CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz);
+ if (metadata == NULL) {
+ return;
+ }
+
+ Parcel* parcelNative = parcelForJavaObject(env, parcel);
+ if (parcelNative == NULL) {
+ jniThrowNullPointerException(env, "parcel");
+ return;
+ }
+
+ status_t err;
+ if ((err = metadata->readFromParcel(parcelNative)) != OK) {
+ jniThrowExceptionFmt(env, "java/lang/IllegalStateException",
+ "Failed to read from parcel (error code %d)", err);
+ return;
+ }
+}
+
+static void CameraMetadata_writeToParcel(JNIEnv *env, jobject thiz, jobject parcel) {
+ ALOGV("%s", __FUNCTION__);
+ CameraMetadata* metadata = CameraMetadata_getPointerThrow(env, thiz);
+ if (metadata == NULL) {
+ return;
+ }
+
+ Parcel* parcelNative = parcelForJavaObject(env, parcel);
+ if (parcelNative == NULL) {
+ jniThrowNullPointerException(env, "parcel");
+ return;
+ }
+
+ status_t err;
+ if ((err = metadata->writeToParcel(parcelNative)) != OK) {
+ jniThrowExceptionFmt(env, "java/lang/IllegalStateException",
+ "Failed to write to parcel (error code %d)", err);
+ return;
+ }
+}
+
+} // extern "C"
+
+//-------------------------------------------------
+
+static JNINativeMethod gCameraMetadataMethods[] = {
+ { "nativeClassInit",
+ "()V",
+ (void *)CameraMetadata_classInit },
+ { "nativeAllocate",
+ "()J",
+ (void*)CameraMetadata_allocate },
+ { "nativeIsEmpty",
+ "()Z",
+ (void*)CameraMetadata_isEmpty },
+ { "nativeGetEntryCount",
+ "()I",
+ (void*)CameraMetadata_getEntryCount },
+ { "nativeClose",
+ "()V",
+ (void*)CameraMetadata_close },
+ { "nativeSwap",
+ "(L" CAMERA_METADATA_CLASS_NAME ";)V",
+ (void *)CameraMetadata_swap },
+ { "nativeReadFromParcel",
+ "(Landroid/os/Parcel;)V",
+ (void *)CameraMetadata_readFromParcel },
+ { "nativeWriteToParcel",
+ "(Landroid/os/Parcel;)V",
+ (void *)CameraMetadata_writeToParcel },
+};
+
+struct field {
+ const char *class_name;
+ const char *field_name;
+ const char *field_type;
+ jfieldID *jfield;
+};
+
+static int find_fields(JNIEnv *env, field *fields, int count)
+{
+ for (int i = 0; i < count; i++) {
+ field *f = &fields[i];
+ jclass clazz = env->FindClass(f->class_name);
+ if (clazz == NULL) {
+ ALOGE("Can't find %s", f->class_name);
+ return -1;
+ }
+
+ jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
+ if (field == NULL) {
+ ALOGE("Can't find %s.%s", f->class_name, f->field_name);
+ return -1;
+ }
+
+ *(f->jfield) = field;
+ }
+
+ return 0;
+}
+
+// Get all the required offsets in java class and register native functions
+int register_android_hardware_photography_CameraMetadata(JNIEnv *env)
+{
+ // Register native functions
+ return AndroidRuntime::registerNativeMethods(env,
+ CAMERA_METADATA_CLASS_NAME,
+ gCameraMetadataMethods,
+ NELEM(gCameraMetadataMethods));
+}
+
+extern "C" {
+static void CameraMetadata_classInit(JNIEnv *env, jobject thiz) {
+ // XX: Why do this separately instead of doing it in the register function?
+ ALOGV("%s", __FUNCTION__);
+
+ field fields_to_find[] = {
+ { CAMERA_METADATA_CLASS_NAME, "mMetadataPtr", "J", &fields.metadata_ptr },
+ };
+
+ // Do this here instead of in register_native_methods,
+ // since otherwise it will fail to find the fields.
+ if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
+ return;
+
+ jclass clazz = env->FindClass(CAMERA_METADATA_CLASS_NAME);
+}
+} // extern "C"