Android NDK - 對Android的未定義引用:: Mutex，Android :: AudioTrack

Question

我在Android :: Mutex和Android :: AudioTrack鏈接時遇到了奇怪的未定義引用，我接管了一個項目。

有沒有人有任何想法？有沒有Android靜態庫包含在那裏？

SharedLibrary：* * jni.so

/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `__static_initialization_and_destruction_0': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:29: undefined reference to `android::Mutex::Mutex()' 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:29: undefined reference to `android::Mutex::~Mutex()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_mute': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:263: undefined reference to `android::AudioTrack::mute(bool)' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_resume': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:255: undefined reference to `android::AudioTrack::start()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_pause': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:247: undefined reference to `android::AudioTrack::pause()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_get_delay': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:237: undefined reference to `android::AudioTrack::latency() const' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_uninit': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:220: undefined reference to `android::AudioTrack::stop()' 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:228: undefined reference to `android::AudioTrack::~AudioTrack()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_start': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:197: undefined reference to `android::AudioTrack::initCheck() const' 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:198: undefined reference to `android::AudioTrack::start()' 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:201: undefined reference to `android::AudioTrack::setVolume(float, float)' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_start': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:207: undefined reference to `android::AudioTrack::~AudioTrack()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:232: undefined reference to `android::Mutex::lock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_init': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:122: undefined reference to `android::AudioTrack::AudioTrack()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~Autolock': 
/Android/source/frameworks/base/include/utils/threads.h:234: undefined reference to `android::Mutex::unlock()' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `android_init': 
/Users/kevin/Desktop/player2/videoplayer/LibPlayer/amadec/audio_out/android_out.cpp:139: undefined reference to `android::AudioTrack::set(int, unsigned int, int, int, int, unsigned int, void (*)(int, void*, void*), void*, int, android::sp<android::IMemory> const&, bool, int)' 
/Users/kevin/Desktop/player2/videoplayer/videoplayer/obj/local/armeabi-v7a/libamadec.a(android_out.o): In function `~sp': 
/Android/source/frameworks/base/include/utils/RefBase.h:378: undefined reference to `android::RefBase::decStrong(void const*) const' 
collect2: ld returned 1 exit status 

Answer 1

這困擾着我，以及 - 但我最後用仿生的頭（bionic/libc/include）連接解決它， - 重要組成部分 - #define「荷蘭國際集團HAVE_PTHREADS（即添加LOCAL_CFLAGS += HAVE_PTHREADS）。

Answer 2

那麼這些都是一些奇怪的錯誤... 看起來每次引用從Android ::互斥或Android的東西： ：AudioTrack庫連接器無法找到這些功能。我只能說因爲這些庫不是android標準庫的一部分，所以確保你的構建路徑中包含它們，否則運氣不錯。