import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
/**
 * Constructs a new instance.
 *
 * @param allocator The {@link DefaultAllocator} used by the loader.
 * @param minBufferMs The minimum duration of media that the player will attempt to ensure is
 *     buffered at all times, in milliseconds.
 * @param maxBufferMs The maximum duration of media that the player will attempt buffer, in
 *     milliseconds.
 * @param bufferForPlaybackMs The duration of media that must be buffered for playback to start or
 *     resume following a user action such as a seek, in milliseconds.
 * @param bufferForPlaybackAfterRebufferMs The default duration of media that must be buffered for
 *     playback to resume after a rebuffer, in milliseconds. A rebuffer is defined to be caused by
 *     buffer depletion rather than a user action.
 * @param targetBufferBytes The target buffer size in bytes. If set to {@link C#LENGTH_UNSET}, the
 *     target buffer size will be calculated using {@link #calculateTargetBufferSize(Renderer[],
 *     TrackSelectionArray)}.
 * @param prioritizeTimeOverSizeThresholds Whether the load control prioritizes buffer time
 */
public DefaultLoadControl(
    DefaultAllocator allocator,
    int minBufferMs,
    int maxBufferMs,
    int bufferForPlaybackMs,
    int bufferForPlaybackAfterRebufferMs,
    int targetBufferBytes,
    boolean prioritizeTimeOverSizeThresholds) {
  this(
      allocator,
      minBufferMs,
      maxBufferMs,
      bufferForPlaybackMs,
      bufferForPlaybackAfterRebufferMs,
      targetBufferBytes,
      prioritizeTimeOverSizeThresholds,
      null);
}
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
private void createExoPlayer() {

        if (mExoPlayer != null) {
            releaseExoPlayer();
        }

        // create default TrackSelector
        TrackSelector trackSelector = new DefaultTrackSelector();

        // create default LoadControl - double the buffer
        LoadControl loadControl = new DefaultLoadControl(new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE * 2));

        // create the player
        mExoPlayer = ExoPlayerFactory.newSimpleInstance(new DefaultRenderersFactory(getApplicationContext()), trackSelector, loadControl);
    }
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
private static LoadControl getNewLoadControl() {
	return new DefaultLoadControl(
		new DefaultAllocator(false, C.DEFAULT_BUFFER_SEGMENT_SIZE),
		DefaultLoadControl.DEFAULT_MIN_BUFFER_MS,
		maxBufferMs.getObject(),
		DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS,
		DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS,
		DefaultLoadControl.DEFAULT_TARGET_BUFFER_BYTES,
		DefaultLoadControl.DEFAULT_PRIORITIZE_TIME_OVER_SIZE_THRESHOLDS);
}
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
@Before
public void setUp() throws Exception {
  allocator = new DefaultAllocator(false, ALLOCATION_SIZE);
  sampleQueue = new SampleQueue(allocator);
  formatHolder = new FormatHolder();
  inputBuffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_NORMAL);
}
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
private void createPlayer() {

        if (mPlayer != null) {
            releasePlayer();
        }

        // create default TrackSelector
        TrackSelector trackSelector = new DefaultTrackSelector();

        // create default LoadControl - double the buffer
        LoadControl loadControl = new DefaultLoadControl(new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE * 2));

        // create the player
        mPlayer = ExoPlayerFactory.newSimpleInstance(new DefaultRenderersFactory(getApplicationContext()), trackSelector, loadControl);
    }
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
/**
 * Instantiates a new Buffering load control.
 */
public BufferingLoadControl() {
    this(new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE));
}
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
public PreviewLoadControl() {
    allocator = new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE);
}
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
/**
 * Constructs a new instance, using the {@code DEFAULT_*} constants defined in this class.
 */
public DefaultLoadControl() {
  this(new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE));
}
 

import com.google.android.exoplayer2.upstream.DefaultAllocator; //导入依赖的package包/类
private void createExoPlayer() {

        if (mExoPlayer != null) {
            releaseExoPlayer();
        }

        DefaultRenderersFactory renderersFactory = new DefaultRenderersFactory(this, null, DefaultRenderersFactory.EXTENSION_RENDERER_MODE_OFF);

        TrackSelector trackSelector = new DefaultTrackSelector();

        LoadControl loadControl = new DefaultLoadControl(new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE * 2));

        mExoPlayer = ExoPlayerFactory.newSimpleInstance(renderersFactory, trackSelector, loadControl);
    }