在哪里可以找到 Android 软件包的源文件？答案

【问题标题】：Where to find the source files for an Android package?在哪里可以找到 Android 软件包的源文件？
【发布时间】：2021-03-19 08:26:57
【问题描述】：

我正在寻找用于构建 /vendor/lib64/hw/audio.primary.imx8.so 的（供应商提供的）源文件。

构建正在运行并生成audio.primary.imx8.so。

在device/fsl/imx8m/ProductConfigCommon.mk中可以看到请求包：

user@server:~/android/smarcimx8mq/q_1000_100/android_build$ grep audio.primary.imx8 -B3 -A9 device/fsl/imx8m/ProductConfigCommon.mk
# audio
PRODUCT_PACKAGES += \
    audio.a2dp.default \
    audio.primary.imx8 \
    audio.r_submix.default \
    audio.usb.default \
    libaudioutils \
    libsrec_jni \
    libtinyalsa \
    tinycap \
    tinymix \
    tinyplay

android_build 目录是应用了所有供应商补丁的 AOSP。

find 只查找此包的输出，而不是源文件：

user@server:~/android/smarcimx8mq/q_1000_100/android_build$ find . -name "*primary*imx8*"
./out/target/product/smarc_mx8mq/symbols/vendor/lib/hw/audio.primary.imx8.so
./out/target/product/smarc_mx8mq/symbols/vendor/lib64/hw/audio.primary.imx8.so
./out/target/product/smarc_mx8mq/vendor/lib/hw/audio.primary.imx8.so
./out/target/product/smarc_mx8mq/vendor/lib64/hw/audio.primary.imx8.so
./out/target/product/smarc_mx8mq/obj_arm/SHARED_LIBRARIES/audio.primary.imx8_intermediates
./out/target/product/smarc_mx8mq/obj_arm/SHARED_LIBRARIES/audio.primary.imx8_intermediates/audio.primary.imx8.so
./out/target/product/smarc_mx8mq/obj/SHARED_LIBRARIES/audio.primary.imx8_intermediates
./out/target/product/smarc_mx8mq/obj/SHARED_LIBRARIES/audio.primary.imx8_intermediates/audio.primary.imx8.so
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8/android_arm_armv7-a-neon_cortex-a9_vendor_shared/audio.primary.imx8.so.d
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8/android_arm_armv7-a-neon_cortex-a9_vendor_shared/audio.primary.imx8.so
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8/android_arm_armv7-a-neon_cortex-a9_vendor_shared/unstripped/audio.primary.imx8.so
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8/android_arm64_armv8-a_cortex-a53_vendor_shared/audio.primary.imx8.so.d
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8/android_arm64_armv8-a_cortex-a53_vendor_shared/audio.primary.imx8.so
./out/soong/.intermediates/vendor/nxp-opensource/imx/alsa/audio.primary.imx8/android_arm64_armv8-a_cortex-a53_vendor_shared/unstripped/audio.primary.imx8.so

audio.primary.imx8 包目录会被称为什么，哪些位置可能是候选位置？

【问题讨论】：

标签： android makefile android-source

【解决方案1】：

找到了：

user@server:~/android/smarcimx8mq/q_1000_100/android_build$ grep primary.imx8 -R system/ frameworks/ vendor/ device/ 2>/dev/null
vendor/nxp-opensource/imx/alsa/Android.bp:    name: "audio.primary.imx8",
device/fsl/imx8m/ProductConfigCommon.mk:    audio.primary.imx8 \
device/fsl/imx8q/ProductConfigCommon.mk:    audio.primary.imx8 \

这是一个.bp 文件，而不是.mk。

user@server:~/android/smarcimx8mq/q_1000_100/android_build$ grep audio_primary_defaults -B2 -A24 vendor/nxp-opensource/imx/alsa/Android.bp
// This is the Freescale ALSA module for i.MX.

audio_primary_defaults {
    name: "audio_primary_default",
    relative_install_path: "hw",
    srcs: [
        "tinyalsa_hal.c",
        "control.c",
        "pcm_ext.c",
    ],

    vendor: true,
    include_dirs: [
        "external/tinyalsa/include",
        "system/media/audio_utils/include",
        "system/media/audio_effects/include",
        "hardware/libhardware/include",
    ],
    shared_libs: [
        "liblog",
        "libcutils",
        "libtinyalsa",
        "libaudioutils",
        "libdl",
        "libpower",
    ],
}

【讨论】：