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-rw-r--r--mozglue/android/SharedMemNatives.cpp80
1 files changed, 80 insertions, 0 deletions
diff --git a/mozglue/android/SharedMemNatives.cpp b/mozglue/android/SharedMemNatives.cpp
new file mode 100644
index 0000000000..f38a2274b3
--- /dev/null
+++ b/mozglue/android/SharedMemNatives.cpp
@@ -0,0 +1,80 @@
+/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <errno.h>
+#include <jni.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include "mozilla/Sprintf.h"
+
+extern "C" {
+
+JNIEXPORT
+void JNICALL
+Java_org_mozilla_gecko_media_SampleBuffer_nativeReadFromDirectBuffer(
+ JNIEnv* jenv, jclass, jobject src, jlong dest, jint offset, jint size) {
+ uint8_t* from = static_cast<uint8_t*>(jenv->GetDirectBufferAddress(src));
+ if (from == nullptr) {
+ jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+ "Null direct buffer");
+ return;
+ }
+
+ void* to = reinterpret_cast<void*>(dest);
+ if (to == nullptr) {
+ jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+ "Null shared memory buffer");
+ return;
+ }
+
+ memcpy(to, from + offset, size);
+}
+
+JNIEXPORT
+void JNICALL
+Java_org_mozilla_gecko_media_SampleBuffer_nativeWriteToDirectBuffer(
+ JNIEnv* jenv, jclass, jlong src, jobject dest, jint offset, jint size) {
+ uint8_t* from = reinterpret_cast<uint8_t*>(src);
+ if (from == nullptr) {
+ jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+ "Null shared memory buffer");
+ return;
+ }
+
+ void* to = jenv->GetDirectBufferAddress(dest);
+ if (to == nullptr) {
+ jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+ "Null direct buffer");
+ return;
+ }
+
+ memcpy(to, from + offset, size);
+}
+
+JNIEXPORT
+jlong JNICALL Java_org_mozilla_gecko_mozglue_SharedMemory_map(JNIEnv* env,
+ jobject jobj,
+ jint fd,
+ jint length) {
+ void* address = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (address == MAP_FAILED) {
+ char msg[128];
+ SprintfLiteral(msg, "mmap failed. errno=%d", errno);
+ env->ThrowNew(env->FindClass("java/lang/NullPointerException"), msg);
+ return 0;
+ }
+ return jlong(address);
+}
+
+JNIEXPORT
+void JNICALL Java_org_mozilla_gecko_mozglue_SharedMemory_unmap(JNIEnv* env,
+ jobject jobj,
+ jlong address,
+ jint size) {
+ munmap((void*)address, (size_t)size);
+}
+}