frameworks/ex/variablespeed/jni/jni_entry.cc

   1 /*
   2  * Copyright (C) 2011 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <stdlib.h>
  18 #include <assert.h>
  19
  20 #include <jni.h>
  21 #include <variablespeed.h>
  22
  23 // Quick #define to make sure I get all the JNI method calls right.
  24 #define JNI_METHOD(x, y) \
  25 JNIEXPORT y JNICALL \
  26 Java_com_android_ex_variablespeed_VariableSpeedNative_##x
  27
  28 class MethodLog {
  29  public:
  30   explicit MethodLog(const char* name) : name_(name) {
  31     LOGV("+ %s", name);
  32   }
  33   virtual ~MethodLog() {
  34     LOGV("- %s", name_);
  35   }
  36
  37  private:
  38   const char* name_;
  39 };
  40
  41 extern "C" {
  42 JNI_METHOD(playFileDescriptor, void) (JNIEnv*, jclass, int fd, jlong offset,
  43     jlong length) {
  44   MethodLog _("playFileDescriptor");
  45   AudioEngine::GetEngine()->PlayFileDescriptor(fd, offset, length);
  46 }
  47
  48 JNI_METHOD(playUri, void) (JNIEnv* env, jclass, jstring uri) {
  49   MethodLog _("playUri");
  50   const char* utf8 = env->GetStringUTFChars(uri, NULL);
  51   CHECK(NULL != utf8);
  52   AudioEngine::GetEngine()->PlayUri(utf8);
  53 }
  54
  55 JNI_METHOD(setVariableSpeed, void) (JNIEnv*, jclass, float speed) {
  56   MethodLog _("setVariableSpeed");
  57   AudioEngine::GetEngine()->SetVariableSpeed(speed);
  58 }
  59
  60 JNI_METHOD(startPlayback, void) (JNIEnv*, jclass) {
  61   MethodLog _("startPlayback");
  62   AudioEngine::GetEngine()->RequestStart();
  63 }
  64
  65 JNI_METHOD(stopPlayback, void) (JNIEnv*, jclass) {
  66   MethodLog _("stopPlayback");
  67   AudioEngine::GetEngine()->RequestStop();
  68 }
  69
  70 JNI_METHOD(getCurrentPosition, int) (JNIEnv*, jclass) {
  71   return AudioEngine::GetEngine()->GetCurrentPosition();
  72 }
  73
  74 JNI_METHOD(getTotalDuration, int) (JNIEnv*, jclass) {
  75   return AudioEngine::GetEngine()->GetTotalDuration();
  76 }
  77
  78 JNI_METHOD(initializeEngine, void) (JNIEnv*, jclass,
  79     int targetFrames, float windowDuration,
  80     float windowOverlapDuration, size_t maxPlayBufferCount,
  81     float initialRate, size_t decodeInitialSize, size_t decodeMaxSize,
  82     size_t startPositionMillis, int audioStreamType) {
  83   MethodLog _("initializeEngine");
  84   AudioEngine::SetEngine(new AudioEngine(targetFrames,
  85       windowDuration, windowOverlapDuration, maxPlayBufferCount, initialRate,
  86       decodeInitialSize, decodeMaxSize, startPositionMillis, audioStreamType));
  87 }
  88
  89 JNI_METHOD(shutdownEngine, void) (JNIEnv*, jclass) {
  90   MethodLog _("shutdownEngine");
  91   AudioEngine::DeleteEngine();
  92 }
  93 }  // extern "C"