예제 #1
0
  private void updateLoadControl() {
    long now = SystemClock.elapsedRealtime();
    long nextLoadPositionUs = getNextLoadPositionUs();
    boolean isBackedOff = currentLoadableException != null;
    boolean loadingOrBackedOff = loader.isLoading() || isBackedOff;

    // If we're not loading or backed off, evaluate the operation if (a) we don't have the next
    // chunk yet and we're not finished, or (b) if the last evaluation was over 2000ms ago.
    if (!loadingOrBackedOff
        && ((currentLoadableHolder.chunk == null && nextLoadPositionUs != -1)
            || (now - lastPerformedBufferOperation > 2000))) {
      // Perform the evaluation.
      lastPerformedBufferOperation = now;
      doChunkOperation();
      boolean chunksDiscarded = discardUpstreamMediaChunks(currentLoadableHolder.queueSize);
      // Update the next load position as appropriate.
      if (currentLoadableHolder.chunk == null) {
        // Set loadPosition to -1 to indicate that we don't have anything to load.
        nextLoadPositionUs = -1;
      } else if (chunksDiscarded) {
        // Chunks were discarded, so we need to re-evaluate the load position.
        nextLoadPositionUs = getNextLoadPositionUs();
      }
    }

    // Update the control with our current state, and determine whether we're the next loader.
    boolean nextLoader =
        loadControl.update(this, downstreamPositionUs, nextLoadPositionUs, loadingOrBackedOff);

    if (isBackedOff) {
      long elapsedMillis = now - currentLoadableExceptionTimestamp;
      if (elapsedMillis >= getRetryDelayMillis(currentLoadableExceptionCount)) {
        resumeFromBackOff();
      }
      return;
    }

    if (!loader.isLoading() && nextLoader) {
      maybeStartLoading();
    }
  }
예제 #2
0
 private void restartFrom(long positionUs) {
   pendingResetPositionUs = positionUs;
   loadingFinished = false;
   if (loader.isLoading()) {
     loader.cancelLoading();
   } else {
     sampleQueue.clear();
     mediaChunks.clear();
     clearCurrentLoadable();
     updateLoadControl();
   }
 }
예제 #3
0
 @Override
 public void disable(int track) {
   Assertions.checkState(state == STATE_ENABLED);
   Assertions.checkState(--enabledTrackCount == 0);
   state = STATE_PREPARED;
   try {
     chunkSource.disable(mediaChunks);
   } finally {
     loadControl.unregister(this);
     if (loader.isLoading()) {
       loader.cancelLoading();
     } else {
       sampleQueue.clear();
       mediaChunks.clear();
       clearCurrentLoadable();
       loadControl.trimAllocator();
     }
   }
 }