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-rw-r--r--jni_jpegstream/src/stream_wrapper.cpp97
1 files changed, 97 insertions, 0 deletions
diff --git a/jni_jpegstream/src/stream_wrapper.cpp b/jni_jpegstream/src/stream_wrapper.cpp
new file mode 100644
index 0000000..049d84f
--- /dev/null
+++ b/jni_jpegstream/src/stream_wrapper.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 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.
+ */
+
+#include "stream_wrapper.h"
+
+const int32_t StreamWrapper::END_OF_STREAM = -1;
+const int32_t StreamWrapper::DEFAULT_BUFFER_SIZE = 1 << 16; // 64Kb
+
+StreamWrapper::StreamWrapper() : mEnv(NULL),
+ mStream(NULL),
+ mByteArray(NULL),
+ mBytes(NULL),
+ mByteArrayLen(0) {}
+
+StreamWrapper::~StreamWrapper() {
+ cleanup();
+}
+
+void StreamWrapper::updateEnv(JNIEnv *env) {
+ if (env == NULL) {
+ LOGE("Cannot update StreamWrapper with a null JNIEnv pointer!");
+ return;
+ }
+ mEnv = env;
+}
+
+bool StreamWrapper::init(JNIEnv *env, jobject stream) {
+ if (mEnv != NULL) {
+ LOGW("StreamWrapper already initialized!");
+ return false;
+ }
+ mEnv = env;
+ mStream = env->NewGlobalRef(stream);
+ if (mStream == NULL || env->ExceptionCheck()) {
+ cleanup();
+ return false;
+ }
+ mByteArrayLen = DEFAULT_BUFFER_SIZE;
+ jbyteArray tmp = env->NewByteArray(getBufferSize());
+ if (tmp == NULL || env->ExceptionCheck()){
+ cleanup();
+ return false;
+ }
+ mByteArray = reinterpret_cast<jbyteArray>(env->NewGlobalRef(tmp));
+ if (mByteArray == NULL || env->ExceptionCheck()){
+ cleanup();
+ return false;
+ }
+ mBytes = env->GetByteArrayElements(mByteArray, NULL);
+ if (mBytes == NULL || env->ExceptionCheck()){
+ cleanup();
+ return false;
+ }
+ return true;
+}
+
+void StreamWrapper::cleanup() {
+ if (mEnv != NULL) {
+ if (mStream != NULL) {
+ mEnv->DeleteGlobalRef(mStream);
+ mStream = NULL;
+ }
+ if (mByteArray != NULL) {
+ if (mBytes != NULL) {
+ mEnv->ReleaseByteArrayElements(mByteArray, mBytes, JNI_ABORT);
+ mBytes = NULL;
+ }
+ mEnv->DeleteGlobalRef(mByteArray);
+ mByteArray = NULL;
+ } else {
+ mBytes = NULL;
+ }
+ mByteArrayLen = 0;
+ mEnv = NULL;
+ }
+}
+
+int32_t StreamWrapper::getBufferSize() {
+ return mByteArrayLen;
+}
+
+jbyte* StreamWrapper::getBufferPtr() {
+ return mBytes;
+}