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// Media3 Engine plugin — Android-only ExoPlayer + FFmpeg audio decoder bridge.
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//
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// 依赖：
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// - Maven Central: media3-exoplayer / media3-datasource / media3-decoder 1.10.1
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// - 本地 AAR : media3-decoder-ffmpeg-1.10.1-arm64.aar
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// 由 fileTree 从主 app 的 android/app/libs/ 加载。AAR 由
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// scripts/build_media3_ffmpeg.sh 自编译产出，CHECKSUMS.txt
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// 记录 SHA-256。
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//
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// AAR 缺失时 preBuild 任务会 fail-fast 抛出带恢复指引的错误（详见 README）。
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import java.security.MessageDigest
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plugins {
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id("com.android.library")
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id("kotlin-android")
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}
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group = "com.smplayer.media3_engine"
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version = "0.0.1"
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android {
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namespace = "com.smplayer.media3_engine"
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compileSdk = 36
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defaultConfig {
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minSdk = 24
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ndk {
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// 与主 app 保持一致：仅 arm64-v8a。其它 ABI 在 FFmpeg AAR 中也不存在，
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// 即便 ABI filter 漏了也只是无声的浪费（不会 crash）。
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abiFilters += listOf("arm64-v8a")
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_17
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targetCompatibility = JavaVersion.VERSION_17
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}
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kotlinOptions {
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jvmTarget = JavaVersion.VERSION_17.toString()
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}
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buildFeatures {
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buildConfig = false
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}
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}
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repositories {
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google()
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mavenCentral()
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}
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// 自编译 FFmpeg audio decoder extension（arm64-v8a only，LGPL 配置）。AAR 由
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// scripts/build_media3_ffmpeg.sh 产出，放在 android/app/libs/。
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// 这里只声明 compileOnly：AGP 8 起禁止 library module 直接 implementation 本地
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// .aar（"Direct local .aar file dependencies are not supported when building an
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// AAR"），实际把 AAR 打入最终 APK 的责任落到主 app/build.gradle.kts 的
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// `implementation(fileTree("libs"))`。本 plugin 编译期只需要 FfmpegAudioRenderer
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// 等符号的可见性。
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val media3Version = "1.10.1"
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val ffmpegAarDir = file("../../../android/app/libs")
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val ffmpegAarName = "media3-decoder-ffmpeg-$media3Version-arm64.aar"
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dependencies {
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implementation("androidx.media3:media3-exoplayer:$media3Version")
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implementation("androidx.media3:media3-datasource:$media3Version")
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implementation("androidx.media3:media3-decoder:$media3Version")
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implementation("androidx.media3:media3-ui:$media3Version")
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compileOnly(fileTree(mapOf("dir" to ffmpegAarDir, "include" to listOf(ffmpegAarName))))
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}
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// AAR 缺失 / 篡改 fail-fast：在 preBuild 之前校验文件存在性 + SHA-256 与
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// `android/app/libs/CHECKSUMS.txt` 一致。CI/Clean checkout 友好。
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val verifyMedia3FfmpegAar by tasks.registering {
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group = "verification"
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description = "Verify media3 FFmpeg decoder AAR exists and matches CHECKSUMS.txt."
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val checksumsFile = ffmpegAarDir.resolve("CHECKSUMS.txt")
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val aarFile = ffmpegAarDir.resolve(ffmpegAarName)
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inputs.file(aarFile).withPropertyName("aar").withPathSensitivity(org.gradle.api.tasks.PathSensitivity.NONE)
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inputs.file(checksumsFile).withPropertyName("checksums").withPathSensitivity(org.gradle.api.tasks.PathSensitivity.NONE)
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doLast {
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if (!aarFile.isFile) {
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throw GradleException(
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"""
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|Media3 FFmpeg decoder AAR is missing:
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| expected: ${aarFile.absolutePath}
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|This AAR is self-built (LGPL config, arm64-v8a,
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|codecs: dca/ac3/eac3/truehd/opus/vorbis/flac).
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|To produce it, run from the repo root:
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| scripts/build_media3_ffmpeg.sh
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|Prerequisites: NDK r26b, JDK 17, ~30-60min wall-clock. See
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|plugins/media3_engine/README.md for full instructions and Docker recipe.
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|If you only build the desktop (Windows/macOS) target, this Android
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|module is not on the dependency path and you can ignore this error.
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""".trimMargin()
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)
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}
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if (!checksumsFile.isFile) {
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throw GradleException(
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"Media3 AAR checksum manifest is missing: ${checksumsFile.absolutePath}\n" +
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"Restore CHECKSUMS.txt from git or rerun scripts/build_media3_ffmpeg.sh."
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)
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}
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// CHECKSUMS.txt 行格式：`<sha256> <filename>`，可有 # 开头注释 / 空行
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val expectedSha = checksumsFile.readLines()
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.map { it.trim() }
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.firstOrNull { it.isNotEmpty() && !it.startsWith("#") && it.endsWith(ffmpegAarName) }
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?.substringBefore(' ')
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?.trim()
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?.lowercase()
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if (expectedSha.isNullOrBlank() || !expectedSha.matches(Regex("^[0-9a-f]{64}$"))) {
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throw GradleException(
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"Media3 AAR checksum entry missing or malformed for $ffmpegAarName in " +
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"${checksumsFile.absolutePath}. Expected a line: '<sha256> $ffmpegAarName'."
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)
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}
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val md = MessageDigest.getInstance("SHA-256")
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aarFile.inputStream().use { input ->
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val buffer = ByteArray(8192)
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while (true) {
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val n = input.read(buffer)
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if (n <= 0) break
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md.update(buffer, 0, n)
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}
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}
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val actualSha = md.digest().joinToString("") { "%02x".format(it) }
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if (actualSha != expectedSha) {
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throw GradleException(
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"""
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|Media3 FFmpeg decoder AAR checksum mismatch — refusing to build.
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| file : ${aarFile.absolutePath}
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| expected : $expectedSha (from CHECKSUMS.txt)
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| actual : $actualSha
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|The AAR has been replaced/corrupted since CHECKSUMS.txt was written.
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|If you intentionally rebuilt it, scripts/build_media3_ffmpeg.sh will
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|refresh CHECKSUMS.txt automatically; otherwise restore the file from git.
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""".trimMargin()
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)
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}
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logger.lifecycle("[verifyMedia3FfmpegAar] OK — sha256 $actualSha")
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}
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}
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afterEvaluate {
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tasks.named("preBuild").configure {
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dependsOn(verifyMedia3FfmpegAar)
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}
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}
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