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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 ANOTHER_PACKET_SOURCE_H_
     18 
     19 #define ANOTHER_PACKET_SOURCE_H_
     20 
     21 #include <media/stagefright/foundation/ABase.h>
     22 #include <media/stagefright/MediaSource.h>
     23 #include <utils/threads.h>
     24 #include <utils/List.h>
     25 
     26 #include "ATSParser.h"
     27 
     28 namespace android {
     29 
     30 struct ABuffer;
     31 
     32 struct AnotherPacketSource : public MediaSource {
     33     AnotherPacketSource(const sp<MetaData> &meta);
     34 
     35     void setFormat(const sp<MetaData> &meta);
     36 
     37     virtual status_t start(MetaData *params = NULL);
     38     virtual status_t stop();
     39     virtual sp<MetaData> getFormat();
     40 
     41     virtual status_t read(
     42             MediaBuffer **buffer, const ReadOptions *options = NULL);
     43 
     44     void clear();
     45 
     46     // Returns true if we have any packets including discontinuities
     47     bool hasBufferAvailable(status_t *finalResult);
     48 
     49     // Returns true if we have packets that's not discontinuities
     50     bool hasDataBufferAvailable(status_t *finalResult);
     51 
     52     // Returns the number of available buffers. finalResult is always OK
     53     // if this method returns non-0, or the final result if it returns 0.
     54     size_t getAvailableBufferCount(status_t *finalResult);
     55 
     56     // Returns the difference between the last and the first queued
     57     // presentation timestamps since the last discontinuity (if any).
     58     int64_t getBufferedDurationUs(status_t *finalResult);
     59 
     60     status_t nextBufferTime(int64_t *timeUs);
     61 
     62     void queueAccessUnit(const sp<ABuffer> &buffer);
     63 
     64     void queueDiscontinuity(
     65             ATSParser::DiscontinuityType type,
     66             const sp<AMessage> &extra,
     67             bool discard);
     68 
     69     void signalEOS(status_t result);
     70 
     71     status_t dequeueAccessUnit(sp<ABuffer> *buffer);
     72     void requeueAccessUnit(const sp<ABuffer> &buffer);
     73 
     74     bool isFinished(int64_t duration) const;
     75 
     76     void enable(bool enable);
     77 
     78     sp<AMessage> getLatestEnqueuedMeta();
     79     sp<AMessage> getLatestDequeuedMeta();
     80     sp<AMessage> getMetaAfterLastDequeued(int64_t delayUs);
     81 
     82     void trimBuffersAfterMeta(const sp<AMessage> &meta);
     83     sp<AMessage> trimBuffersBeforeMeta(const sp<AMessage> &meta);
     84 
     85 protected:
     86     virtual ~AnotherPacketSource();
     87 
     88 private:
     89 
     90     struct DiscontinuitySegment {
     91         int64_t mMaxDequeTimeUs, mMaxEnqueTimeUs;
     92         DiscontinuitySegment()
     93             : mMaxDequeTimeUs(-1),
     94               mMaxEnqueTimeUs(-1) {
     95         };
     96 
     97         void clear() {
     98             mMaxDequeTimeUs = mMaxEnqueTimeUs = -1;
     99         }
    100     };
    101 
    102     // Discontinuity segments are consecutive access units between
    103     // discontinuity markers. There should always be at least _ONE_
    104     // discontinuity segment, hence the various CHECKs in
    105     // AnotherPacketSource.cpp for non-empty()-ness.
    106     List<DiscontinuitySegment> mDiscontinuitySegments;
    107 
    108     Mutex mLock;
    109     Condition mCondition;
    110 
    111     bool mIsAudio;
    112     bool mIsVideo;
    113     bool mEnabled;
    114     sp<MetaData> mFormat;
    115     int64_t mLastQueuedTimeUs;
    116     List<sp<ABuffer> > mBuffers;
    117     status_t mEOSResult;
    118     sp<AMessage> mLatestEnqueuedMeta;
    119     sp<AMessage> mLatestDequeuedMeta;
    120 
    121     bool wasFormatChange(int32_t discontinuityType) const;
    122 
    123     DISALLOW_EVIL_CONSTRUCTORS(AnotherPacketSource);
    124 };
    125 
    126 
    127 }  // namespace android
    128 
    129 #endif  // ANOTHER_PACKET_SOURCE_H_
    130