1 files changed, 233 insertions, 0 deletions
diff --git a/lib/ffts/java/jni/ffts_jni.c b/lib/ffts/java/jni/ffts_jni.c
new file mode 100644
index 0000000..41fdf76
--- /dev/null
+++ b/lib/ffts/java/jni/ffts_jni.c
@@ -0,0 +1,233 @@
+/*
+ * This file is part of FFTS -- The Fastest Fourier Transform in the South
+ *
+ * Copyright (c) 2013, Michael Zucchi <notzed@gmail.com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of the organization nor the
+ *     names of its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ANTHONY M. BLAKE BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <ffts.h>
+#include <alloca.h>
+
+// Bit of a hack for android, as we can't build the *.h without
+// the classes ... but we can't build the project without the jni.
+#ifdef ANDROID
+#include <jni.h>
+#else
+#include "nz_ac_waikato_ffts_FFTS.h"
+#endif
+
+// TODO: feature tests instead
+#ifdef HAVE_SSE
+#define NEEDS_ALIGNED
+#endif
+
+#ifdef NEEDS_ALIGNED
+#define ALIGN_MASK 15
+
+static void *
+xmemalign(size_t align, size_t size) {
+#if defined(HAVE_DECL_POSIX_MEMALIGN)
+	void *r;
+
+	if (posix_memalign(&r, align, size) != 0)
+		return NULL;
+	return r;	
+#elif defined(HAVE_DECL_MEMALIGN)
+	return memalign(align, size);
+#else
+#error "Require an aligning malloc"
+#endif
+}
+#endif
+
+static void
+throwOutOfMemoryError(JNIEnv *env, const char *msg) {
+	jclass jc = (*env)->FindClass(env, "java/lang/OutOfMemoryError");
+
+	if (jc)
+		(*env)->ThrowNew(env, jc, msg);
+}
+
+JNIEXPORT jlong JNICALL Java_nz_ac_waikato_ffts_FFTS_complex_11d
+(JNIEnv *env, jclass jc, jint N, jint sign) {
+	ffts_plan_t *plan;
+
+	plan = ffts_init_1d(N, sign);
+	if (!plan)
+		throwOutOfMemoryError(env, NULL);
+
+	return (jlong)plan;
+}
+
+JNIEXPORT jlong JNICALL Java_nz_ac_waikato_ffts_FFTS_complex_12d
+(JNIEnv *env, jclass jc, jint N1, jint N2, jint sign) {
+	ffts_plan_t *plan;
+
+	plan = ffts_init_2d(N1, N2, sign);
+	if (!plan)
+		throwOutOfMemoryError(env, NULL);
+
+	return (jlong)plan;
+}
+
+JNIEXPORT jlong JNICALL Java_nz_ac_waikato_ffts_FFTS_complex_1nd
+(JNIEnv *env, jclass jc, jintArray jNs, jint sign) {
+	ffts_plan_t *plan;
+	int n = (*env)->GetArrayLength(env, jNs);
+	int *cNs;
+	size_t *Ns;
+	int i;
+
+	// Needs to convert java int array to size_t array
+	// Get the int elements and conver to C type
+	Ns = alloca(sizeof(*Ns) * n);
+	cNs = alloca(sizeof(int) * n);
+	(*env)->GetIntArrayRegion(env, jNs, 0, n, cNs);
+	for (i=0;i<n;i++)
+		Ns[i] = cNs[i];
+
+	plan = ffts_init_nd(n, Ns, sign);
+	if (!plan)
+		throwOutOfMemoryError(env, NULL);
+
+	return (jlong)plan;
+}
+
+JNIEXPORT jlong JNICALL Java_nz_ac_waikato_ffts_FFTS_real_11d
+(JNIEnv *env, jclass jc, jint N, jint sign) {
+	ffts_plan_t *plan;
+
+	plan = ffts_init_1d_real(N, sign);
+	if (!plan)
+		throwOutOfMemoryError(env, NULL);
+
+	return (jlong)plan;
+}
+
+JNIEXPORT jlong JNICALL Java_nz_ac_waikato_ffts_FFTS_real_12d
+(JNIEnv *env, jclass jc, jint N1, jint N2, jint sign) {
+	ffts_plan_t *plan;
+
+	plan = ffts_init_2d_real(N1, N2, sign);
+	if (!plan)
+		throwOutOfMemoryError(env, NULL);
+
+	return (jlong)plan;
+}
+
+JNIEXPORT jlong JNICALL Java_nz_ac_waikato_ffts_FFTS_real_1nd
+(JNIEnv *env, jclass jc, jintArray jNs, jint sign) {
+	ffts_plan_t *plan;
+	int n = (*env)->GetArrayLength(env, jNs);
+	int *cNs;
+	size_t *Ns;
+	int i;
+
+	// Needs to convert java int array to size_t array
+	// Get the int elements and conver to C type
+	Ns = alloca(sizeof(*Ns) * n);
+	cNs = alloca(sizeof(int) * n);
+	(*env)->GetIntArrayRegion(env, jNs, 0, n, cNs);
+	for (i=0;i<n;i++)
+		Ns[i] = cNs[i];
+
+	plan = ffts_init_nd_real(n, Ns, sign);
+	if (!plan)
+		throwOutOfMemoryError(env, NULL);
+
+	return (jlong)plan;
+}
+
+JNIEXPORT void JNICALL Java_nz_ac_waikato_ffts_FFTS_execute__JJ_3FI_3FI
+(JNIEnv *env, jclass jc, jlong p, jlong size, jfloatArray jsrc, jint soff, jfloatArray jdst, jint doff) {
+	ffts_plan_t *plan = (ffts_plan_t *)p;
+
+	// TODO: check performance on android/arm
+#ifdef NEEDS_ALIGNED
+	// On oracle jvm this is faster than GetFloatArrayElements()
+	void *src, *dst;
+
+	src = xmemalign(64, size * 4);
+	if (!src) {
+		throwOutOfMemoryError(env, NULL);
+		return;
+	}
+	dst = xmemalign(64, size * 4);
+	if (!dst) {
+		free(src);
+		throwOutOfMemoryError(env, NULL);
+		return;
+	}
+
+	(*env)->GetFloatArrayRegion(env, jsrc, 0, size, src + soff);
+	ffts_execute(plan, src, dst);
+	(*env)->SetFloatArrayRegion(env, jdst, 0, size, dst + doff);
+
+	free(dst);
+	free(src);
+#else
+	// This is the fastest with oracle jvm, but doesn't work with sse ...
+	void *src = (*env)->GetPrimitiveArrayCritical(env, jsrc, NULL);
+	void *dst = (*env)->GetPrimitiveArrayCritical(env, jdst, NULL);
+
+	ffts_execute(plan, src + soff, dst + doff);
+
+	(*env)->ReleasePrimitiveArrayCritical(env, jdst, dst, 0);
+	(*env)->ReleasePrimitiveArrayCritical(env, jsrc, src, 0);
+#endif
+
+#if 0
+	// This is the slowest
+	void *src = (*env)->GetFloatArrayElements(env, jsrc, NULL);
+	void *dst = (*env)->GetFloatArrayElements(env, jdst, NULL);
+
+	ffts_execute(plan, src + soff, dst + doff);
+
+	(*env)->ReleaseFloatArrayElements(env, jdst, dst, 0);
+	(*env)->ReleaseFloatArrayElements(env, jsrc, src, 0);
+#endif
+}
+
+JNIEXPORT void JNICALL Java_nz_ac_waikato_ffts_FFTS_execute__JJLjava_nio_FloatBuffer_2Ljava_nio_FloatBuffer_2
+(JNIEnv *env, jclass jc, jlong p, jlong size, jobject jsrc, jobject jdst) {
+	ffts_plan_t *plan = (ffts_plan_t *)p;
+	void *src = (*env)->GetDirectBufferAddress(env, jsrc);
+	void *dst = (*env)->GetDirectBufferAddress(env, jdst);
+
+	// Bounds checking etc is in java side.
+
+	ffts_execute(plan, src, dst);
+}
+
+JNIEXPORT void JNICALL Java_nz_ac_waikato_ffts_FFTS_free
+(JNIEnv *env, jclass jc, jlong p) {
+	ffts_plan_t *plan = (ffts_plan_t *)p;
+
+	ffts_free(plan);
+}