137 lines
3.8 KiB
C++
137 lines
3.8 KiB
C++
/*
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**
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** Copyright 2007, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#define LOG_TAG "ResampleInputStream"
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#include "utils/Log.h"
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#include <media/mediarecorder.h>
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#include <stdio.h>
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#include <assert.h>
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#include <limits.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <utils/threads.h>
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#include "jni.h"
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#include "JNIHelp.h"
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#include "android_runtime/AndroidRuntime.h"
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// ----------------------------------------------------------------------------
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using namespace android;
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//
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// helper function to throw an exception
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//
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static void throwException(JNIEnv *env, const char* ex, const char* fmt, int data) {
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if (jclass cls = env->FindClass(ex)) {
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char msg[1000];
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sprintf(msg, fmt, data);
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env->ThrowNew(cls, msg);
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env->DeleteLocalRef(cls);
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}
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}
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#define FIR_COEF(coef) (short)(0x10000 * coef)
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static const short fir21[] = {
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FIR_COEF(-0.006965742326),
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FIR_COEF(-0.008428945737),
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FIR_COEF( 0.004241280174),
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FIR_COEF( 0.022141096893),
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FIR_COEF( 0.018765669437),
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FIR_COEF(-0.009871891152),
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FIR_COEF(-0.024842433247),
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FIR_COEF( 0.006121772058),
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FIR_COEF( 0.045890841611),
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FIR_COEF( 0.021573503509),
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FIR_COEF(-0.059681984668),
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FIR_COEF(-0.076036275138),
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FIR_COEF( 0.072405390275),
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FIR_COEF( 0.308255674582),
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FIR_COEF( 0.424321210495),
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FIR_COEF( 0.308255674582),
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FIR_COEF( 0.072405390275),
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FIR_COEF(-0.076036275138),
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FIR_COEF(-0.059681984668),
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FIR_COEF( 0.021573503509),
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FIR_COEF( 0.045890841611),
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FIR_COEF( 0.006121772058),
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FIR_COEF(-0.024842433247),
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FIR_COEF(-0.009871891152),
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FIR_COEF( 0.018765669437),
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FIR_COEF( 0.022141096893),
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FIR_COEF( 0.004241280174),
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FIR_COEF(-0.008428945737),
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FIR_COEF(-0.006965742326)
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};
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static const int nFir21 = sizeof(fir21) / sizeof(fir21[0]);
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static const int BUF_SIZE = 2048;
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static void android_media_ResampleInputStream_fir21(JNIEnv *env, jclass clazz,
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jbyteArray jIn, jint jInOffset,
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jbyteArray jOut, jint jOutOffset,
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jint jNpoints) {
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// safety first!
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if (nFir21 + jNpoints * 2 > BUF_SIZE) {
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throwException(env, "java/lang/IllegalArgumentException",
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"FIR+data too long %d", nFir21 + jNpoints);
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return;
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}
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// get input data
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short in[BUF_SIZE];
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env->GetByteArrayRegion(jIn, jInOffset, (jNpoints * 2 + nFir21 - 1) * 2, (jbyte*)in);
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// compute filter
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short out[BUF_SIZE];
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for (int i = 0; i < jNpoints; i++) {
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long sum = 0;
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const short* firp = &fir21[0];
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const short* inp = &in[i * 2];
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for (int n = nFir21; --n >= 0; ) {
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sum += ((long)*firp++) * ((long)*inp++);
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}
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out[i] = (short)(sum >> 16);
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}
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// save new values
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env->SetByteArrayRegion(jOut, jOutOffset, jNpoints * 2, (jbyte*)out);
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}
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// ----------------------------------------------------------------------------
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static JNINativeMethod gMethods[] = {
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{"fir21", "([BI[BII)V", (void*)android_media_ResampleInputStream_fir21},
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};
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int register_android_media_ResampleInputStream(JNIEnv *env)
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{
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const char* const kClassPathName = "android/media/ResampleInputStream";
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return AndroidRuntime::registerNativeMethods(env,
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kClassPathName, gMethods, NELEM(gMethods));
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}
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