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      1 /*
      2  * Copyright 2012, 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 MEDIA_PULLER_H_
     18 
     19 #define MEDIA_PULLER_H_
     20 
     21 #include <media/stagefright/foundation/AHandler.h>
     22 
     23 namespace android {
     24 
     25 struct MediaSource;
     26 
     27 struct MediaPuller : public AHandler {
     28     enum {
     29         kWhatEOS,
     30         kWhatAccessUnit
     31     };
     32 
     33     MediaPuller(const sp<MediaSource> &source, const sp<AMessage> &notify);
     34 
     35     status_t start();
     36     void stopAsync(const sp<AMessage> &notify);
     37 
     38     void pause();
     39     void resume();
     40 
     41 protected:
     42     virtual void onMessageReceived(const sp<AMessage> &msg);
     43     virtual ~MediaPuller();
     44 
     45 private:
     46     enum {
     47         kWhatStart,
     48         kWhatStop,
     49         kWhatPull,
     50         kWhatPause,
     51         kWhatResume,
     52     };
     53 
     54     sp<MediaSource> mSource;
     55     sp<AMessage> mNotify;
     56     int32_t mPullGeneration;
     57     bool mIsAudio;
     58     bool mPaused;
     59 
     60     status_t postSynchronouslyAndReturnError(const sp<AMessage> &msg);
     61     void schedulePull();
     62 
     63     DISALLOW_EVIL_CONSTRUCTORS(MediaPuller);
     64 };
     65 
     66 }  // namespace android
     67 
     68 #endif  // MEDIA_PULLER_H_
     69