edde746
da21481ff3
AssMatroskaExtractor and MatroskaLatmSupport reflect MatroskaExtractor's private extractorOutput/subtitleSample fields by name, but no keep rule covered them: R8 renames the fields and every MKV direct-play in a release build fails constructing the extractor. Adds the keepclassmembernames rule (descriptors verified against media3 1.11.0 in the Gradle cache) and extends check_shrinker_rules.py to scan Kotlin/Java reflection across all android src/main roots including libass.
38 lines
2.3 KiB
Prolog
38 lines
2.3 KiB
Prolog
# Flutter turns minification on for every release build (FlutterPlugin sets
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# releaseBuildType.isMinifyEnabled), and appends this file when it exists. Anything the
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# app reaches only by name — reflection or JNI — therefore needs an explicit keep here.
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# The bundled Media3 FFmpeg audio decoder (ALAC, DTS, DTS-HD, TrueHD, ...).
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#
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# DefaultRenderersFactory instantiates FfmpegAudioRenderer through Class.forName and no
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# app code references it, so R8 shrinks the class away; media3's own consumer rules only
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# -keepclassmembers its constructor, which neither keeps the class nor pins its name.
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# ffmpeg_jni.cc separately resolves FfmpegAudioDecoder and its growOutputBuffer callback
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# by name in JNI_OnLoad, and returns JNI_ERR when either is missing, which fails the whole
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# System.loadLibrary("ffmpegJNI") call.
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#
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# Without these keeps a release build silently loses every codec this decoder adds:
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# TrueHD/DTS-HD land on MediaCodecAudioRenderer, which has no decoder for them, and
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# playback bails to the mpv fallback and loses ExoPlayer's Dolby Vision handling (#1703).
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-keep class androidx.media3.decoder.ffmpeg.** { *; }
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# growOutputBuffer's JNI descriptor names this type, so it may not be renamed either.
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-keep class androidx.media3.decoder.SimpleDecoderOutputBuffer { *; }
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# MatroskaExtractor.init is final and its ExtractorOutput / subtitle scratch buffer live
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# in private fields, so the extractor wrappers reach both by name: AssMatroskaExtractor
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# (android/libass/.../media/extractor/AssMatroskaExtractor.kt) resolves extractorOutput
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# and subtitleSample with getDeclaredField to redirect ASS subtitle samples, and
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# MatroskaLatmSupport (android/app/.../exoplayer/MatroskaLatmSupport.kt) resolves
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# extractorOutput the same way to wrap LATM tracks.
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#
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# R8 renaming either field makes getDeclaredField throw; AssMatroskaExtractor resolves
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# them in its companion object, so the throw surfaces as ExceptionInInitializerError
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# while constructing the extractor — every MKV direct-play, release builds only. Only
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# the *names* need pinning: MatroskaExtractor uses both fields itself, so they survive
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# shrinking through the compile-time subclass references.
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-keepclassmembernames class androidx.media3.extractor.mkv.MatroskaExtractor {
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private androidx.media3.extractor.ExtractorOutput extractorOutput;
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private androidx.media3.common.util.ParsableByteArray subtitleSample;
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}
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