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      1 /*
      2  * Copyright (C) 2010 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 NUPLAYER_SOURCE_H_
     18 
     19 #define NUPLAYER_SOURCE_H_
     20 
     21 #include "NuPlayer.h"
     22 
     23 #include <media/stagefright/foundation/AMessage.h>
     24 
     25 namespace android {
     26 
     27 struct ABuffer;
     28 struct MetaData;
     29 
     30 struct NuPlayer::Source : public AHandler {
     31     enum Flags {
     32         FLAG_CAN_PAUSE          = 1,
     33         FLAG_CAN_SEEK_BACKWARD  = 2,  // the "10 sec back button"
     34         FLAG_CAN_SEEK_FORWARD   = 4,  // the "10 sec forward button"
     35         FLAG_CAN_SEEK           = 8,  // the "seek bar"
     36         FLAG_DYNAMIC_DURATION   = 16,
     37     };
     38 
     39     enum {
     40         kWhatPrepared,
     41         kWhatFlagsChanged,
     42         kWhatVideoSizeChanged,
     43         kWhatBufferingStart,
     44         kWhatBufferingEnd,
     45     };
     46 
     47     // The provides message is used to notify the player about various
     48     // events.
     49     Source(const sp<AMessage> &notify)
     50         : mNotify(notify) {
     51     }
     52 
     53     virtual void prepareAsync() = 0;
     54 
     55     virtual void start() = 0;
     56     virtual void stop() {}
     57     virtual void pause() {}
     58     virtual void resume() {}
     59 
     60     // Returns OK iff more data was available,
     61     // an error or ERROR_END_OF_STREAM if not.
     62     virtual status_t feedMoreTSData() = 0;
     63 
     64     virtual sp<AMessage> getFormat(bool audio);
     65 
     66     virtual status_t dequeueAccessUnit(
     67             bool audio, sp<ABuffer> *accessUnit) = 0;
     68 
     69     virtual status_t getDuration(int64_t *durationUs) {
     70         return INVALID_OPERATION;
     71     }
     72 
     73     virtual status_t seekTo(int64_t seekTimeUs) {
     74         return INVALID_OPERATION;
     75     }
     76 
     77     virtual bool isRealTime() const {
     78         return false;
     79     }
     80 
     81 protected:
     82     virtual ~Source() {}
     83 
     84     virtual void onMessageReceived(const sp<AMessage> &msg);
     85 
     86     virtual sp<MetaData> getFormatMeta(bool audio) { return NULL; }
     87 
     88     sp<AMessage> dupNotify() const { return mNotify->dup(); }
     89 
     90     void notifyFlagsChanged(uint32_t flags);
     91     void notifyVideoSizeChanged(int32_t width, int32_t height);
     92     void notifyPrepared(status_t err = OK);
     93 
     94 private:
     95     sp<AMessage> mNotify;
     96 
     97     DISALLOW_EVIL_CONSTRUCTORS(Source);
     98 };
     99 
    100 }  // namespace android
    101 
    102 #endif  // NUPLAYER_SOURCE_H_
    103 
    104