text: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef ANOTHER_PACKET_SOURCE_H_
  
  #define ANOTHER_PACKET_SOURCE_H_
  
  #include <media/stagefright/MediaSource.h>
  #include <media/stagefright/foundation/ABase.h>
  #include <utils/threads.h>
  #include <utils/List.h>
  
  #include "ATSParser.h"
  
  namespace android {
  
  struct ABuffer;
  
  struct AnotherPacketSource : public MediaSource {
      explicit AnotherPacketSource(const sp<MetaData> &meta);
  
      void setFormat(const sp<MetaData> &meta);
  
      virtual status_t start(MetaData *params = NULL);
      virtual status_t stop();
      virtual sp<MetaData> getFormat();
  
      virtual status_t read(
              MediaBufferBase **buffer, const ReadOptions *options = NULL);
  
      void clear();
  
      // Returns true if we have any packets including discontinuities
      bool hasBufferAvailable(status_t *finalResult);
  
      // Returns true if we have packets that's not discontinuities
      bool hasDataBufferAvailable(status_t *finalResult);
  
      // Returns the number of available buffers. finalResult is always OK
      // if this method returns non-0, or the final result if it returns 0.
      size_t getAvailableBufferCount(status_t *finalResult);
  
      // Returns the difference between the last and the first queued
      // presentation timestamps since the last discontinuity (if any).
      int64_t getBufferedDurationUs(status_t *finalResult);
  
      // Returns the difference between the two largest timestamps queued
      int64_t getEstimatedBufferDurationUs();
  
      status_t nextBufferTime(int64_t *timeUs);
  
      void queueAccessUnit(const sp<ABuffer> &buffer);
  
      void queueDiscontinuity(
              ATSParser::DiscontinuityType type,
              const sp<AMessage> &extra,
              bool discard);
  
      void signalEOS(status_t result);
  
      status_t dequeueAccessUnit(sp<ABuffer> *buffer);
      void requeueAccessUnit(const sp<ABuffer> &buffer);
  
      bool isFinished(int64_t duration) const;
  
      void enable(bool enable);
  
      sp<AMessage> getLatestEnqueuedMeta();
      sp<AMessage> getLatestDequeuedMeta();
      sp<AMessage> getMetaAfterLastDequeued(int64_t delayUs);
  
      void trimBuffersAfterMeta(const sp<AMessage> &meta);
      sp<AMessage> trimBuffersBeforeMeta(const sp<AMessage> &meta);
  
  protected:
      virtual ~AnotherPacketSource();
  
  private:
  
      struct DiscontinuitySegment {
          int64_t mMaxDequeTimeUs, mMaxEnqueTimeUs;
          DiscontinuitySegment()
              : mMaxDequeTimeUs(-1),
                mMaxEnqueTimeUs(-1) {
          };
  
          void clear() {
              mMaxDequeTimeUs = mMaxEnqueTimeUs = -1;
          }
      };
  
      // Discontinuity segments are consecutive access units between
      // discontinuity markers. There should always be at least _ONE_
      // discontinuity segment, hence the various CHECKs in
      // AnotherPacketSource.cpp for non-empty()-ness.
      List<DiscontinuitySegment> mDiscontinuitySegments;
  
      Mutex mLock;
      Condition mCondition;
  
      bool mIsAudio;
      bool mIsVideo;
      bool mEnabled;
      sp<MetaData> mFormat;
      int64_t mLastQueuedTimeUs;
      int64_t mEstimatedBufferDurationUs;
      List<sp<ABuffer> > mBuffers;
      status_t mEOSResult;
      sp<AMessage> mLatestEnqueuedMeta;
      sp<AMessage> mLatestDequeuedMeta;
  
      bool wasFormatChange(int32_t discontinuityType) const;
  
      DISALLOW_EVIL_CONSTRUCTORS(AnotherPacketSource);
  };
  
  
  }  // namespace android
  
  #endif  // ANOTHER_PACKET_SOURCE_H_
  