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      1 /*
      2  * Copyright 2017, 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 #ifndef _ANDROID_MEDIA_BUFFERING_PARAMS_H_
     18 #define _ANDROID_MEDIA_BUFFERING_PARAMS_H_
     19 
     20 #include <media/BufferingSettings.h>
     21 
     22 namespace android {
     23 
     24 // This entire class is inline
     25 struct BufferingParams {
     26     BufferingSettings settings;
     27 
     28     struct fields_t {
     29         jclass      clazz;
     30         jmethodID   constructID;
     31 
     32         jfieldID    initial_mark_ms;
     33         jfieldID    resume_playback_mark_ms;
     34 
     35         void init(JNIEnv *env) {
     36             jclass lclazz = env->FindClass("android/media/BufferingParams");
     37             if (lclazz == NULL) {
     38                 return;
     39             }
     40 
     41             clazz = (jclass)env->NewGlobalRef(lclazz);
     42             if (clazz == NULL) {
     43                 return;
     44             }
     45 
     46             constructID = env->GetMethodID(clazz, "<init>", "()V");
     47 
     48             initial_mark_ms = env->GetFieldID(clazz, "mInitialMarkMs", "I");
     49             resume_playback_mark_ms = env->GetFieldID(clazz, "mResumePlaybackMarkMs", "I");
     50 
     51             env->DeleteLocalRef(lclazz);
     52         }
     53 
     54         void exit(JNIEnv *env) {
     55             env->DeleteGlobalRef(clazz);
     56             clazz = NULL;
     57         }
     58     };
     59 
     60     void fillFromJobject(JNIEnv *env, const fields_t& fields, jobject params) {
     61         settings.mInitialMarkMs =
     62             env->GetIntField(params, fields.initial_mark_ms);
     63         settings.mResumePlaybackMarkMs =
     64             env->GetIntField(params, fields.resume_playback_mark_ms);
     65     }
     66 
     67     jobject asJobject(JNIEnv *env, const fields_t& fields) {
     68         jobject params = env->NewObject(fields.clazz, fields.constructID);
     69         if (params == NULL) {
     70             return NULL;
     71         }
     72         env->SetIntField(params, fields.initial_mark_ms, (jint)settings.mInitialMarkMs);
     73         env->SetIntField(params, fields.resume_playback_mark_ms, (jint)settings.mResumePlaybackMarkMs);
     74 
     75         return params;
     76     }
     77 };
     78 
     79 }  // namespace android
     80 
     81 #endif  // _ANDROID_MEDIA_BUFFERING_PARAMS_H_
     82