ExoPlayer，如何加载远程音频文件的更大部分

Question

I'm using ExoPlayer 2 to play remote tracks. By default the player loads tracks piece by piece (ie about 20 seconds, then other 20 seconds while the track is playing).

Since tracks are loaded from a remote server, it happens that if connection goes down, the player is not able to load anymore. Is there a way to say to ExoPlayer to load bigger parts of the audio file (also the full track at once)?

I tried to see around ExtractorMediaSource , DataSource.Factory and DefaultExtractorsFactory but I've found nothing to solve my problem.

val audioSource = ExtractorMediaSource(
        Uri.parse(videoUrl),
        mDataSourceFactory,    // DataSource.Factory
        mExtractor,    // DefaultExtractorsFactory
        null,
        null
)

mExoPlayer.prepare(audioSource)
mExoPlayer.playWhenReady = true

(it is Kotlin, but it seems to be understandable also by Java programmers)

Answer 1

I've found the solution. Since I'm not finding other related questions, I'll answer to my question (I hope someone will need it in the future):

The right object to configure is the LoadControl passed to the ExoPlayerFactory when creating the ExoPlayer object:

Original answer (deprecated):

val loadControl = DefaultLoadControl(
            DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE),
            5 * 60 * 1000, // this is it!
            10 * 60 * 1000,
            DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS.toLong(),
            DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS.toLong()
)
exoPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl)

The updated answer:

val bandwidthMeter = DefaultBandwidthMeter.Builder(context).build()
val trackSelectionFactory = AdaptiveTrackSelection.Factory()
val trackSelector = DefaultTrackSelector(trackSelectionFactory)

val loadControl = DefaultLoadControl.Builder()
        .setAllocator(DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE))
        .setBufferDurationsMs(
            5 * 60 * 1000, // this is it!
            10 * 60 * 1000,
            DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS,
            DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS
        )
        .setTargetBufferBytes(DefaultLoadControl.DEFAULT_TARGET_BUFFER_BYTES)
        .setPrioritizeTimeOverSizeThresholds(DefaultLoadControl.DEFAULT_PRIORITIZE_TIME_OVER_SIZE_THRESHOLDS)
        .createDefaultLoadControl()

exoPlayer = ExoPlayerFactory.newSimpleInstance(
        context,
        DefaultRenderersFactory(context),
        trackSelector,
        loadControl,
        null,
        bandwidthMeter)

The doc where it is explained.

Answer 2

Answer of @Massimo is correct but the way is deprecated

use something like this

DefaultLoadControl.Builder()
            .setBufferDurationsMs(
                DefaultLoadControl.DEFAULT_MIN_BUFFER_MS, 
                30_000, 
                DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS,
                DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS
            )