Android Q播放器（编译报错处理）

最新在Bring up公司的播放器从Android 4.4到Android Q，期间遇到很多“坑”，总结出来记录一下。期间也会简单介绍一下在Android系统中新建一个类似Nuplayer的播放器大概需要哪些步骤。

代码目录：frameworks/av/media/libmediaplayerservice/

最先动的地方是MediaPlayerFactory.cpp，我的做法是根据项目需求，选择是否走自己的播放器还是Android原生播放器（因为过XTS认证会走Android原生flow），改动如下（记得把RAIN_PLAYER的define放在跟NuPlayer一样的地方，以后这样简单的事情就不在赘述啦^_^）：

void MediaPlayerFactory::registerBuiltinFactories() {Mutex::Autolock lock_(&sLock);if (sInitComplete)return;IFactory* factory = new NuPlayerFactory();if (registerFactory_l(factory, NU_PLAYER) != OK)delete factory;factory = new TestPlayerFactory();if (registerFactory_l(factory, TEST_PLAYER) != OK)delete factory;#ifdef BUILD_WITH_XXXX_MMregisterFactory_l(new RainPlayerFactory(), RAIN_PLAYER);
#endifsInitComplete = true;
}

分享一个小技巧，我们公司的coding style是如果有动到Android原生的部分，要在改动上下加上如下打印：

// xxxx Android Patch Begin

// xxxx Android Patch End

RainPlayerFactory部分如下，至于自己的player放在哪里，完全由自己决定，可以选择放在frameworks/av/media/libmedia或是其他什么地方，我放在了vendor目录。

// xxxx Android Patch Begin
class RainPlayerFactory : public MediaPlayerFactory::IFactory {public:virtual float scoreFactory(const sp<IMediaPlayer>& /* client */,const char* url,const sp<IMediaHTTPService>& /* httpService */,float curScore) {static const float kOurScore = 2.0;   // 定义一个比较高的分数，PK赢了会走自己的playerif (kOurScore <= curScore)return 0.0;if (!strncasecmp("http://", url, 7)|| !strncasecmp("https://", url, 8)) {size_t len = strlen(url);if (len >= 5 && !strcasecmp(".m3u8", &url[len - 5])) {
#ifdef SPECIAL_STREAM_USE_NUPLAYERif (strstr(url, "/sample_aes/")) {return 0.0;}
#endifreturn kOurScore;}if (strstr(url,"m3u8")) {
#ifdef SPECIAL_STREAM_USE_NUPLAYERif (strstr(url, "/sample_aes/")) {return 0.0;}
#endifreturn kOurScore;}}if (!strncasecmp("rtsp://", url, 7)) {return kOurScore;}return 0.0;}virtual float scoreFactory(const sp<IMediaPlayer>& /* client */,const sp<IStreamSource>& /* source */,float /* curScore */) {return 1.0;}virtual sp<MediaPlayerBase> createPlayer(pid_t /* pid */) {ALOGV("Create RainPlyer");return new RainPlyer;}
};#ifdef SUPPORT_RAINPLAYER
class RainPlayerFactory : public MediaPlayerFactory::IFactory {public:virtual sp<MediaPlayerBase> createPlayer(pid_t /* pid */) {ALOGV("Create RainPlyer");return new RainPlyer;}
};
#endif
// xxxx Android Patch End

编译部分，我在mediaplayerservice加入了soong，这样可以根据BoardConfig.mk来进行动态编译，简单来说就是编译中的环境变量会传给libmediaplayerservice.go比如可以加变量来动态选择走NuPlayer还是RainPlayer，只在BoardConfig.mk中改一行配置信息即可。BoardConfig.mk修改之后，编译系统会自动去检测：

device/xxx/xxx/BoardConfig.mk was modified, regenerating...

修改frameworks/av/media/libmediaplayerservice/Android.bp：

    // xxx Android Patch Begindefaults: ["mediaplayerservicedefaults",],// xxx Android Patch End

添加frameworks/av/media/libmediaplayerservice/soong/Android.bp：

bootstrap_go_package {name: "soong-mediaplayerservice",pkgPath: "android/soong/vendor/xxx/mediaplayerservice",deps: ["blueprint","blueprint-pathtools","soong","soong-android","soong-cc",],srcs: ["libmediaplayerservice.go",],pluginFor: ["soong_build"],
}mediaplayerservicedefaults {name: "mediaplayerservicedefaults",
}

添加frameworks/av/media/libmediaplayerservice/soong/libmediaplayerservice.go：

package libmediaplayerserviceimport ("fmt""android/soong/android""android/soong/cc"
)//Build Option
const BUILD_WITH_RIAN    string = "BUILD_WITH_RIAN"func init() {android.RegisterModuleType("mediaplayerservicedefaults", mediaplayerserviceDefaultsFactory)
}func mediaplayerserviceDefaultsFactory() android.Module {module := cc.DefaultsFactory()android.AddLoadHook(module, globalMediaPlayerServiceDefault)return module
}func globalMediaPlayerServiceDefault(ctx android.LoadHookContext) {type props struct {Srcs []stringInclude_dirs []stringShared_libs []stringStatic_libs []stringCflags []string}p := &props{}p.Srcs         = globalMediaPlayerServiceSrcs(ctx)p.Include_dirs = globalMediaPlayerServiceIncludeDirs(ctx)p.Shared_libs = globalMediaPlayerServiceSharedLibs(ctx)p.Static_libs = globalMediaPlayerServiceStaticLibs(ctx)p.Cflags       = globalMediaPlayerServiceCflags(ctx)ctx.AppendProperties(p)
}func globalMediaPlayerServiceSrcs(ctx android.BaseContext) ([]string) {var srcs []stringreturn srcs
}func globalMediaPlayerServiceIncludeDirs(ctx android.BaseContext) ([]string) {var includeDirs []stringvar tmp stringif (envIsTrue(ctx, BUILD_WITH_RIAN) {// 在这里可以加入你新建Player的相关头文件includeDirs = append(includeDirs, "external/skia/include")includeDirs = append(includeDirs, "external/skia/include/core")includeDirs = append(includeDirs, "vendor/XXX/common/libraries/media/mmplayer/")}return includeDirs
}func globalMediaPlayerServiceSharedLibs(ctx android.BaseContext) ([]string) {var shared_libs []stringif (envIsTrue(ctx, BUILD_WITH_RIAN) {// 在这里可以加入你新建Player的相关动态链接库shared_libs = append(shared_libs, "librainplayer")}return shared_libs
}func globalMediaPlayerServiceStaticLibs(ctx android.BaseContext) ([]string) {var static_libs []stringif envIsTrue(ctx, BUILD_WITH_MARLIN) {// 在这里可以加入你新建Player的相关静态链接库static_libs = append(static_libs, "libstagefright_nuplayer_wasabi")static_libs = append(static_libs, "libWasabi")}return static_libs
}func globalMediaPlayerServiceCflags(ctx android.BaseContext) ([]string) {var cflags []string// 如果没成功，可以在这里加打印，看看env有没有设置下来fmt.Println("fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")fmt.Println("BUILD_WITH_RIAN:",ctx.AConfig().IsEnvTrue("BUILD_WITH_RIAN"))if (envIsTrue(ctx, BUILD_WITH_RAIN) {// 在这里可以加入你新建Player的条件编译// 与Android.mk的LOCAL_CFLAGS += -DBUILD_WITH_RAIN类似cflags = append(cflags, "-BUILD_WITH_RAIN")}return cflags
}func envDefault(ctx android.BaseContext, key string, defaultValue string) string {ret := ctx.AConfig().Getenv(key)if ret == "" {return defaultValue}return ret
}func envIsOptionValue(ctx android.BaseContext, key string, value string) bool {return ctx.AConfig().Getenv(key) == value
}func envIsNotOptionValue(ctx android.BaseContext, key string, value string) bool {return ctx.AConfig().Getenv(key) != value
}func envIsTrue(ctx android.BaseContext, key string) bool { //ctx android.LoadHookContext) {return ctx.AConfig().IsEnvTrue(key);
}func printLog(msg string) {fmt.Println(msg)
}func print2Log(msg string, param string) {if param != "" {fmt.Errorf(msg + ", %s", param)}
}

mediaplayerservice的工作量基本就这些，剩下再往下就是播放器本身的部分，还有OpenMax、display...这些部分涉及公司的代码太多，不好粘贴了。接下说一下遇到的坑...

坑1：

如果编译的模块开始vndk，你又修改了他的API，那么VNDK就会报错，出错信息一般长这样：

******************************************************

error: VNDK library: libmedia_omx's ABI has EXTENDING CHANGES Please check compatiblity report at : out/soong/.intermediates/frameworks/av/media/libmedia/libmedia_omx/android_arm_armv8-a_cortex-a53_vendor_shared/libmedia_omx.so.abidiff

******************************************************

---- Please update abi references by running platform/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l libmedia_omx ----

我总结了如下几种方式：

1、最粗暴的（不推荐）

在BoardConfig.mk中加入如下两行，可以在编译的时候不去check VNDK，关掉这个可能会导致XTS某些测项跑不过，一般code review也不会给过...

BOARD_VNDK_VERSION :=
BOARD_VNDK_RUNTIME_DISABLE := true

2、一般粗暴：

删除如下目录的这些文件

/prebuilts/abi-dumps/vndk

./28/32/arm_armv7-a-neon/source-based/libion.so.lsdump.gz

./28/32/x86/source-based/libion.so.lsdump.gz

./28/64/arm64_armv8-a/source-based/libion.so.lsdump.gz

./28/64/arm_armv8-a/source-based/libion.so.lsdump.gz

./28/64/x86/source-based/libion.so.lsdump.gz

./28/64/x86_64/source-based/libion.so.lsdump.gz

./28/64/x86_x86_64/source-based/libion.so.lsdump.gz

我最终在本地的解法就是进入到/prebuilts/abi-dumps/vndk，搜索libmedia_omx, 将搜索到的libmedia_omx.so.lsdump*全部删除。并重新编译，结果就build pass了。这样也不太好，如果你上代码到服务器，自己这样一搞可以编过，那别人就惨了...

3、正解（推荐）：

其实报错信息有让你去跑一个脚本，之前我也有试过，始终跑不过，找了很多资料，结果少了-products xxx // xxx为boardname，敲如下命令就build pass了，上code到服务器，完美~

development/vndk/tools/header-checker/utils/create_reference_dumps.py -l libmedia_omx -products xxx // xxx为boardname

坑2：

error: frameworks/av/media/libmediaplayerservice/Android.bp:1:1: dependency "librain" of "libmediaplayerservice" missing variant:
arch:android_arm64_armv8-a_cortex-a53, image:core, link:shared, version:
available variants:
arch:android_arm_armv7-a-neon_cortex-a7, image:core, link:shared, version:
FAILED: [W][2019-10-21T15:15:03+0800][1] bool caps::initNs(nsjconf_t *)():215 prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL): Invalid argument
15:15:21 soong bootstrap failed with: exit status 1
初步看起来像是想要去编译librain的64位的其他架构的版本，晚上也有很多种情况，这里我遇到的情况是，librain的Android.bp中动态链接了一些vendor的底层lib，导致libmediaplayerservice链接librain的时候报错，拿掉这些lib之后就build pass了。

shared_libs: ["libc","liblog","libdl","libcutils","libutils","libui","libmedia","libsurfaceflinger","libbinder","libstagefright","libstagefright_foundation","libz","libcrypto","libgui",//"android.hidl.allocator@1.0",//"android.hidl.memory@1.0",//"android.hardware.media.omx@1.0",
],

坑3：

FAILED:
build/make/core/base_rules.mk:325: error: vendor/xxx/common/libraries/media/mmplayer/mmp: MODULE.TARGET.SHARED_LIBRARIES.libmmp_32 already defined by vendor/xxx/common/libraries/media/mmplayer/mmp.
15:02:20 ckati failed with: exit status 1

#### failed to build some targets (02:35 (mm:ss)) ####
因为是Andorid 4.4移植到Android 10.0，所以原来Android 4.4的Android.mk还存在各个目录，如果Android.mk和Android.bp定义了相同的moudle就会报如上错误。解决方式也很简单，我的方法是在Android.mk中加入如下条件，若是API 28以下让整个Andorid.mk失效，这样既不会影响老版本的Andorid项目，也解决的Android Q的编译问题。

ifeq (1, $(strip $(shell expr $(PLATFORM_SDK_VERSION) \< 28)))
xxx
endif

坑4：

FAILED: out/soong/.intermediates/vendor/xxx/common/libraries/media/mmplayer/mmp/libmmp/android_arm_armv7-a-neon_cortex-a7_core_shared/libmmp.so.toc
echo "module libmmp missing dependencies: libmmdisp" && false
module libmmp missing dependencies: libmmdisp
[ 97% 987/1013] //vendor/xxx/common/libraries/media/mmplayer/mmp:libmmp strip libmmp.so [arm]
FAILED: out/soong/.intermediates/vendor/xxx/common/libraries/media/mmplayer/mmp/libmmp/android_arm_armv7-a-neon_cortex-a7_core_shared/libmmp.so
echo "module libmmp missing dependencies: libmmdisp" && false
module libmmp missing dependencies: libmmdisp
[ 97% 988/1013] //vendor/xxx/common/libraries/media/mmplayer/mmp:libmmp link libmmp.so [arm]
FAILED: out/soong/.intermediates/vendor/xxx/common/libraries/media/mmplayer/mmp/libmmp/android_arm_armv7-a-neon_cortex-a7_core_shared/unstripped/libmmp.so
echo "module libmmp missing dependencies: libmmdisp" && false
module libmmp missing dependencies: libmmdisp

libmmdisp是我司的显示模块，跟我移植的播放器不是同一process，所以要动态链接一下，链接libmmdisp时就会报错，然后本身libmmdisp编译是可以pass的。

原因是libmmdisp还是延用之前Android.mk的编译方式，我的player是用Android.bp去链接libmmdisp，所以找不到。解法自然是在libmmdisp中引入Android.bp的编译方式。

编译上比较棘手的坑大概就这些了，这种工作势必会经历如下阶段：

代码编不过；

代码编过了链接出问题；

链接没问题了，编版本烧录起不来；

平台起来了，播放会挂掉；

播放不挂了，但是黑屏，显示不正常；

最后显示正常，剩一些无声，硬解码起不来等小bug在慢慢修...

如上每一步都遇到了，要时刻保持良好心态，一步一个脚印，不多说了，解bug去了，o(╥﹏╥)o...

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