test(evidence): reproduce LL-HLS failure on Media3 1.10.1

player/media3/src/androidTest/kotlin/app/muxtv/player/media3/LlHlsByteRangeCharacterizationTest.kt

@@ -0,0 +1,301 @@
+package app.muxtv.player.media3
+
+import android.content.Context
+import android.os.Handler
+import android.os.HandlerThread
+import android.util.Base64
+import androidx.annotation.OptIn as AndroidXOptIn
+import androidx.media3.common.PlaybackException
+import androidx.media3.common.Player
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import app.muxtv.network.MuxTvHttpClients
+import com.google.common.truth.Truth.assertThat
+import java.io.Closeable
+import java.util.Collections
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicReference
+import mockwebserver3.Dispatcher
+import mockwebserver3.MockResponse
+import mockwebserver3.MockWebServer
+import mockwebserver3.RecordedRequest
+import okio.Buffer
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * Characterization evidence for androidx/media#3350 through MuxTV's production HLS construction.
+ *
+ * The origin is fully local and contains no provider data. The init fragment and bounded media
+ * bytes come from AndroidX Media3's Apache-2.0 CMAF test corpus (`audio_init.mp4` and the first
+ * 512 bytes of `audio_2.m4s`). The playlist exposes those 512 bytes as a trailing LL-HLS part.
+ *
+ * On Media3 versions affected by #3350, FragmentedMp4Extractor consumes the complete bounded
+ * DataSpec and asks for more input. HlsMediaChunk stores nextLoadPosition == DataSpec.length and
+ * retries the same chunk. The retry calls DataSpec.subrange(length), which attempts to create an
+ * illegal zero-length DataSpec and surfaces an unexpected IllegalArgumentException before another
+ * HTTP open. This test locks that existing upstream failure signature; it is not a workaround.
+ */
+@RunWith(AndroidJUnit4::class)
+@AndroidXOptIn(UnstableApi::class)
+class LlHlsByteRangeCharacterizationTest {
+    private val context: Context = ApplicationProvider.getApplicationContext()
+
+    @Test
+    fun byteRangeLlHlsPart_retriesIntoIllegalZeroLengthSubrange() {
+        LlHlsOrigin.start().use { origin ->
+            PlayerHarness(context).use { harness ->
+                harness.post {
+                    val request = PlaybackSessionRequest(
+                        profileId = "profile-ll-hls-evidence",
+                        mediaId = "channel-ll-hls-evidence",
+                        variantId = "variant-ll-hls-evidence",
+                        locator = origin.playlistUrl(),
+                        insecureHttpApproved = true,
+                        mimeType = "application/x-mpegURL",
+                    )
+                    harness.player.setMediaSource(
+                        PlaybackMediaSourceFactory(context, MuxTvHttpClients()).create(request),
+                    )
+                    harness.player.prepare()
+                    harness.player.play()
+                }
+
+                val error = harness.awaitPlayerError(ERROR_TIMEOUT_SECONDS) {
+                    "requests=${origin.requests()}"
+                }
+                val causes = causeChain(error)
+                val illegalArgument = causes.filterIsInstance<IllegalArgumentException>()
+                    .firstOrNull()
+
+                assertThat(illegalArgument).isNotNull()
+                val stack = checkNotNull(illegalArgument).stackTrace
+                assertThat(
+                    stack.any {
+                        it.className == "androidx.media3.datasource.DataSpec" &&
+                            it.methodName == "subrange"
+                    },
+                ).isTrue()
+                assertThat(
+                    stack.any {
+                        it.className == "androidx.media3.exoplayer.hls.HlsMediaChunk" &&
+                            it.methodName == "feedDataToExtractor"
+                    },
+                ).isTrue()
+
+                val partRequests = origin.requests().filter { it.contains("GET /audio_2.m4s") }
+                assertThat(partRequests).containsExactly("GET /audio_2.m4s range=bytes=0-511")
+            }
+        }
+    }
+
+    private fun causeChain(error: Throwable): List<Throwable> {
+        val result = mutableListOf<Throwable>()
+        var current: Throwable? = error
+        while (current != null && result.size < MAX_CAUSE_DEPTH) {
+            result += current
+            current = current.cause
+        }
+        return result
+    }
+
+    private class PlayerHarness(context: Context) : Closeable {
+        private val thread = HandlerThread("ll-hls-characterization").apply { start() }
+        private val handler = Handler(thread.looper)
+        private val playerError = AtomicReference<PlaybackException?>()
+        val player: ExoPlayer
+
+        init {
+            val playerRef = AtomicReference<ExoPlayer>()
+            post {
+                playerRef.set(
+                    ExoPlayer.Builder(context)
+                        .setLooper(thread.looper)
+                        .build()
+                        .also { exoPlayer ->
+                            exoPlayer.addListener(
+                                object : Player.Listener {
+                                    override fun onPlayerError(error: PlaybackException) {
+                                        playerError.set(error)
+                                    }
+                                },
+                            )
+                        },
+                )
+            }
+            player = checkNotNull(playerRef.get())
+        }
+
+        fun post(block: () -> Unit) {
+            val latch = CountDownLatch(1)
+            val failure = AtomicReference<Throwable?>()
+            handler.post {
+                try {
+                    block()
+                } catch (throwable: Throwable) {
+                    failure.set(throwable)
+                } finally {
+                    latch.countDown()
+                }
+            }
+            check(latch.await(OPERATION_TIMEOUT_SECONDS, TimeUnit.SECONDS)) {
+                "player-thread operation timed out"
+            }
+            failure.get()?.let { throw it }
+        }
+
+        fun awaitPlayerError(
+            timeoutSeconds: Long,
+            diagnostics: () -> String,
+        ): PlaybackException {
+            val deadlineNanos = System.nanoTime() + TimeUnit.SECONDS.toNanos(timeoutSeconds)
+            while (System.nanoTime() < deadlineNanos) {
+                playerError.get()?.let { return it }
+                Thread.sleep(POLL_INTERVAL_MILLIS)
+            }
+            throw AssertionError(
+                "LL-HLS fixture did not produce a player error within the deadline; ${diagnostics()}",
+            )
+        }
+
+        override fun close() {
+            post { player.release() }
+            thread.quitSafely()
+        }
+    }
+
+    private class LlHlsOrigin private constructor() : Closeable {
+        private val requests = Collections.synchronizedList(mutableListOf<String>())
+        private val initSegment = Base64.decode(INIT_SEGMENT_BASE64, Base64.DEFAULT)
+        private val boundedMediaPart = Base64.decode(BOUNDED_MEDIA_PART_BASE64, Base64.DEFAULT)
+        private val server = MockWebServer().also { mockServer ->
+            mockServer.dispatcher = object : Dispatcher() {
+                override fun dispatch(request: RecordedRequest): MockResponse {
+                    val path = request.url.encodedPath
+                    requests += "${request.method} $path range=${request.headers["Range"] ?: "<none>"}"
+                    return when (path) {
+                        "/fixture.m3u8" -> textResponse(PLAYLIST_CONTENT_TYPE, PLAYLIST)
+                        "/audio_init.mp4" -> bytesResponse(INIT_CONTENT_TYPE, initSegment)
+                        "/audio_2.m4s" -> mediaPartResponse(request)
+                        else -> MockResponse.Builder().code(404).build()
+                    }
+                }
+            }
+        }
+
+        private fun mediaPartResponse(request: RecordedRequest): MockResponse {
+            val range = request.headers["Range"]
+            if (range != EXPECTED_MEDIA_RANGE) {
+                return MockResponse.Builder()
+                    .code(416)
+                    .addHeader("Content-Range", "bytes */$MEDIA_RESOURCE_SIZE")
+                    .build()
+            }
+            check(boundedMediaPart.size == BOUNDED_MEDIA_PART_SIZE)
+            return MockResponse.Builder()
+                .code(206)
+                .addHeader("Content-Type", PART_CONTENT_TYPE)
+                .addHeader("Accept-Ranges", "bytes")
+                .addHeader(
+                    "Content-Range",
+                    "bytes 0-${BOUNDED_MEDIA_PART_SIZE - 1}/$MEDIA_RESOURCE_SIZE",
+                )
+                .addHeader("Content-Length", boundedMediaPart.size.toString())
+                .body(Buffer().write(boundedMediaPart))
+                .build()
+        }
+
+        fun playlistUrl(): String = server.url("/fixture.m3u8").toString()
+
+        fun requests(): List<String> = synchronized(requests) { requests.toList() }
+
+        override fun close() {
+            server.close()
+        }
+
+        companion object {
+            fun start(): LlHlsOrigin = LlHlsOrigin().also { it.server.start() }
+
+            private const val PLAYLIST_CONTENT_TYPE = "application/vnd.apple.mpegurl"
+            private const val INIT_CONTENT_TYPE = "audio/mp4"
+            private const val PART_CONTENT_TYPE = "audio/mp4"
+            private const val BOUNDED_MEDIA_PART_SIZE = 512
+            private const val MEDIA_RESOURCE_SIZE = 3811
+            private const val EXPECTED_MEDIA_RANGE = "bytes=0-511"
+
+            private val PLAYLIST = """
+                #EXTM3U
+                #EXT-X-VERSION:9
+                #EXT-X-TARGETDURATION:1
+                #EXT-X-MEDIA-SEQUENCE:1
+                #EXT-X-MAP:URI="audio_init.mp4"
+                #EXT-X-PART-INF:PART-TARGET=0.255420
+                #EXT-X-PART:URI="audio_2.m4s",DURATION=0.255420,INDEPENDENT=YES,BYTERANGE="512@0"
+            """.trimIndent() + "\n"
+
+            // Exact androidx/media 1.10.1 libraries/test_data CMAF audio_init.mp4, blob
+            // 4d0cbdc5b0298a19f8eca80a5503e8d14b7c25c6.
+            private val INIT_SEGMENT_BASE64 = """
+                AAAAJGZ0eXBtcDQxAAAAAGlzbzhpc29tbXA0MWRhc2hjbWZjAAADHW1vb3YA
+                AABsbXZoZAAAAADljXm75Y15uwAArEQAAAAAAAEAAAEAAAAAAAAAAAAAAAAB
+                AAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAA
+                AAAAAAAAAAAAAAAAAAAAAAIAAACUbWV0YQAAAAAAAAAgaGRscgAAAAAAAAAA
+                SUQzMgAAAAAAAAAAAAAAAAAAAGhJRDMyAAAAABXHSUQzBAAAAAAAUFBSSVYA
+                AABGAABodHRwczovL2dpdGh1Yi5jb20vc2hha2EtcHJvamVjdC9zaGFrYS1w
+                YWNrYWdlcgB2My40LjItYzgxOWRlYS1yZWxlYXNlAAAB3XRyYWsAAABcdGto
+                ZAAAAAfljXm75Y15uwAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAQAA
+                AAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAVVt
+                ZGlhAAAAIG1kaGQAAAAA5Y15u+WNebsAAKxEAAAAAFXEAAAAAAAtaGRscgAA
+                AAAAAAAAc291bgAAAAAAAAAAAAAAAFNvdW5kSGFuZGxlcgAAAAEAbWluZgAA
+                ACRkaW5mAAAAHGRyZWYAAAAAAAAAAQAAAAx1cmwgAAAAAQAAAMRzdGJsAAAA
+                XnN0c2QAAAAAAAAAAQAAAE5tcDRhAAAAAAAAAAEAAAAAAAAAAAABABAAAAAA
+                rEQAAAAAACplc2RzAAAAAAMcAAAABBRAFQAAAAAB9AAAAeawBQUSCFblAAYB
+                AgAAABBzdHRzAAAAAAAAAAAAAAAQc3RzYwAAAAAAAAAAAAAAFHN0c3oAAAAA
+                AAAAAAAAAAAAAAAQc3RjbwAAAAAAAAAAAAAAGnNncGQBAAAAcm9sbAAAAAIA
+                AAAB//8AAAAQc21oZAAAAAAAAAAAAAAAJGVkdHMAAAAcZWxzdAAAAAAAAAAB
+                AAAAAAAABAAAAQAAAAAAOG12ZXgAAAAQbWVoZAAAAAAAAgjMAAAAIHRyZXgA
+                AAAAAAAAAQAAAAEAAAQAAAAAAAAAAAA=
+            """.trimIndent()
+
+            // First 512 bytes of androidx/media 1.10.1 CMAF audio_2.m4s, blob
+            // 40111ff3c411240cd3ada1a7478f58d164a2011d. Decodes to exactly 512 bytes.
+            private val BOUNDED_MEDIA_PART_BASE64 = """
+                AAAAJHN0eXBtcDQxAAAAAGlzbzhpc29tbXA0MWRhc2hjbWZzAAAALHNpZHgAAAAAAAAAAQAArEQA
+                ACwAAAAAAAAAAAEAAA6TAAAsAJAAAAAAAACobW9vZgAAABBtZmhkAAAAAAAAAAIAAACQdHJhZgAA
+                ABx0ZmhkAAIAKgAAAAEAAAABAAAEAAAAAAAAAAAQdGZkdAAAAAAAADAAAAAAQHRydW4AAAIBAAAA
+                CwAAALAAAAFhAAABKgAAAVcAAAFPAAABLgAAAU4AAAE8AAABOgAAATgAAAE9AAABSwAAABxzYmdw
+                AAAAAHJvbGwAAAABAAAACwAAAAEAAA3rbWRhdAD0OK6tQkKrP/w8f/prWs9p7e06/p7/47+euePX
+                ndSib1mudV4sqpA1NK0srSqXqN0kQkoivqShNM+38/Y2fsbSC4lVaVX9IMbOGHOGMkuqrlxJsEij
+                y74tgIsfFllniXzFvVJXDnZhEsFxMEWHTUbFEBYg5sH6LvTiDsTHE8dNl+bJTDydSVSRs97Wnq6t
+                6FlusoGtt/ZWm7OvRX3TCJgxIBMfCos5yv8svil7031CEHyRWHwxdWzsUa5SNWNYE4UWpGm44qMQ
+                AwQ8VkErK2r1gFSQCw0X0OSvCo5pkMVo6rea0I8ixO70HdRWZApG9pwgShQ0ErDicqwRagrIjcI=
+            """.trimIndent()
+
+            private fun textResponse(contentType: String, body: String): MockResponse =
+                MockResponse.Builder()
+                    .code(200)
+                    .addHeader("Content-Type", contentType)
+                    .body(Buffer().writeUtf8(body))
+                    .build()
+
+            private fun bytesResponse(contentType: String, body: ByteArray): MockResponse =
+                MockResponse.Builder()
+                    .code(200)
+                    .addHeader("Content-Type", contentType)
+                    .addHeader("Content-Length", body.size.toString())
+                    .addHeader("Accept-Ranges", "bytes")
+                    .body(Buffer().write(body))
+                    .build()
+        }
+    }
+
+    private companion object {
+        const val ERROR_TIMEOUT_SECONDS = 20L
+        const val OPERATION_TIMEOUT_SECONDS = 30L
+        const val POLL_INTERVAL_MILLIS = 50L
+        const val MAX_CAUSE_DEPTH = 16
+    }
+}