Fix E-AC3 output capability check without sample rate

PiperOrigin-RevId: 432189509
(cherry picked from commit e66d0c9)

Author: andrewlewis

RELEASENOTES.md

@@ -2,6 +2,9 @@
 
 ### dev-v2 (not yet released)
 
+*   Audio:
+    *   Fix error checking audio capabilities for Dolby Atmos (E-AC3-JOC) in
+        HLS.
 *   Extractors:
     *   FMP4: Fix issue where emsg sample metadata could be output in the wrong
         order for streams containing both v0 and v1 emsg atoms

library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java

@@ -1730,8 +1730,11 @@ private static Pair<Integer, Integer> getEncodingAndChannelConfigForPassthrough(
       // the channel count for this encoding, but before then there is no way to query it so we
       // assume 6 channel audio is supported.
       if (Util.SDK_INT >= 29) {
+        // Default to 48 kHz if the format doesn't have a sample rate (for example, for chunkless
+        // HLS preparation). See [Internal: b/222127949].
+        int sampleRate = format.sampleRate != Format.NO_VALUE ? format.sampleRate : 48000;
         channelCount =
-            getMaxSupportedChannelCountForPassthroughV29(C.ENCODING_E_AC3_JOC, format.sampleRate);
+            getMaxSupportedChannelCountForPassthroughV29(C.ENCODING_E_AC3_JOC, sampleRate);
         if (channelCount == 0) {
           Log.w(TAG, "E-AC3 JOC encoding supported but no channel count supported");
           return null;