ImaServerSideAdInsertionMediaSource hangs forever when the IMA SDK never calls back requestStream() (regression since interactivemedia 3.39.0 / media3 1.10.0)

Version

Media3 1.10.0

More version details

No response

Devices that reproduce the issue

iPhone 13
Android 12 - Samsung S23

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Not tested

Reproduction steps

Configure content with DAI (ImaServerSideAdInsertionMediaSource) using media3 1.10.0+.
Play back repeatedly (the failure is intermittent and depends on the IMA SDK/ad server's behavior, not fully deterministic).
When the IMA SDK fails to invoke any callback for the stream request, the player hangs on black indefinitely.

1.9.4 (works) vs 1.10.0 / 1.10.1 (broken)
Transitive dependency com.google.ads.interactivemedia.v3:interactivemedia: 3.38.0 on 1.9.4 → 3.39.0 on 1.10.0+ (confirmed via git show :libraries/exoplayer_ima/build.gradle)
Consumed through a fork of react-native-video
Reproducible on multiple Android devices, intermittently
Affects both DAI (server-side) and VAST (client-side) ads; this report focuses on the DAI path, which is the one that could be fully diagnosed with thread dumps
(Fill in: device models, Android/API levels, exact media3-exoplayer-ima version, and whether this also reproduces without the react-native-video fork, directly against plain ExoPlayer/media3)

Expected result

If the IMA stream request fails or never responds, ImaServerSideAdInsertionMediaSource should report an error in a timely manner (or retry), allowing the app to react (e.g. by falling back to ad-free content).

Actual result

In libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java, the inner class StreamManagerLoadable does the following inside load():

javaadsLoader.requestStream(request);
conditionVariable.block(); // no timeout

conditionVariable is only released once the IMA SDK invokes some callback (success or error) for that stream request. It was confirmed (via two independent adb bugreport captures, taken during separate failure sessions) that IMA SDK 3.39.0 can, intermittently, invoke no callback at all — neither success nor error — for requestStream(). Since conditionVariable.block() has no timeout, the ExoPlayer:Loader:ImaServerSideAdInsertionMediaSource thread ends up blocked indefinitely at:

ImaServerSideAdInsertionMediaSource.java:1195 (StreamManagerLoadable.load(), conditionVariable.block())

Because no content URI is ever resolved and no Timeline/MediaPeriod is ever created, there is also no mechanism for maybeThrowSourceInfoRefreshError() to surface the problem — that method is only polled via MaskingMediaPeriod.maybeThrowPrepareError() once a MediaPeriod already exists, which never happens in this scenario. Net result: the player is stuck on a black screen, with no ExoPlaybackException/onPlayerError, and no log output at all.

Media

Not applicable - DRM protected

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.