使用 NDK 构建音频处理 Little Endian SDK

Posted 2023-03-13

【中文标题】使用 NDK 构建音频处理 Little Endian SDK

【英文标题】：Building audio processing Little Endian SDK with NDK

【发布时间】：2014-10-14 21:20:21

【问题描述】：

我正在尝试使用 ndk-build 在 android 应用程序中使用来自 Little Endian 的本机代码进行音频处理（我还没有 JNI）。

当我在 jni dir 中执行 ndk-build 时，我得到了（$USER_PATH 是我计算机上目录的路径）：

Android NDK: WARNING: Rebuilding libc++ libraries from sources!    
Android NDK: You might want to use $NDK/build/tools/build-cxx-stl.sh --stl=libc++    
Android NDK: in order to build prebuilt versions to speed up your builds!    
Android NDK: ERROR:$USER_PATH/android-ndk-r10/sources/android/compiler-rt/Android.mk:compiler_rt_shared: LOCAL_SRC_FILES points to a missing file    
Android NDK: $USER_PATH/Android/android-ndk-r10/sources/android/compiler-rt/libs/armeabi/libcompiler_rt_shared.so exists  or that its path is correct   
$USER_PATH/android-ndk-r10/build/core/prebuilt-library.mk:45: *** Android NDK: Aborting    .  Stop.

我看到这是因为 PREBUILT_STATIC_LIBRARY 指向丢失的文件。

我该如何解决这个问题？

目录结构：

有.mk文件：

Android.mk

MY_LOCAL_PATH := $(call my-dir)

ifndef LE_SDK_PATH
    LE_SDK_PATH := $(call my-dir)
endif

include $(MY_LOCAL_PATH)/le_audioio.mk
include $(MY_LOCAL_PATH)/le_utility.mk

LOCAL_PATH := $MY_LOCAL_PATH
include $(CLEAR_VARS)

LOCAL_MODULE           := little-endian
LOCAL_STATIC_LIBRARIES := le_audioio le_utility

include $(BUILD_SHARED_LIBRARY)

应用程序.mk

APP_PLATFORM := android-14
APP_STL      := c++_static
APP_ABI      := armeabi armeabi-v7a x86
APP_OPTIM    := release
APP_CFLAGS   += -g

NDK_TOOLCHAIN_VERSION := clang

le_audioio.mk

ifndef LE_SDK_PATH
    LE_SDK_PATH := $(call my-dir)
endif

LOCAL_PATH:= $(LE_SDK_PATH)

include $(CLEAR_VARS)

LOCAL_MODULE            := le_audioio
LOCAL_EXPORT_C_INCLUDES := $(abspath $(LE_SDK_PATH)/include)
LOCAL_EXPORT_LDLIBS     += -lOpenSLES
ifeq ($(TARGET_ARCH_ABI),x86)
    LOCAL_SRC_FILES     := libs/development/libAudioIO_Android_x86-32_SSSE3.a
else
    ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
        LOCAL_ARM_NEON  := true
        LOCAL_SRC_FILES := libs/development/libAudioIO_Android_ARMv7a_NEON.a
    else
        LOCAL_SRC_FILES := libs/release/libAudioIO_Android_ARMv6_VFP2.a
    endif
endif

include $(PREBUILT_STATIC_LIBRARY)

le_utilityio.mk

ifndef LE_SDK_PATH
    LE_SDK_PATH := $(call my-dir)
endif

LOCAL_PATH:= $(LE_SDK_PATH)

include $(CLEAR_VARS)

LOCAL_MODULE            := le_utility
LOCAL_EXPORT_C_INCLUDES := $(abspath $(LE_SDK_PATH)/include)
LOCAL_EXPORT_LDLIBS     += -landroid -llog
ifeq ($(TARGET_ARCH_ABI),x86)
    LOCAL_SRC_FILES     := libs/development/libUtility_Android_x86-32_SSSE3.a
else
    ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
        LOCAL_ARM_NEON  := true
        LOCAL_SRC_FILES := libs/development/libUtility_Android_ARMv7a_NEON.a
    else
        LOCAL_SRC_FILES     := libs/release/libUtility_Android_ARMv6_VFP2.a
        LOCAL_EXPORT_LDLIBS += -latomic
    endif
endif

include $(PREBUILT_STATIC_LIBRARY)

【问题讨论】：

我检查了从 Application.mk 构建中删除 NDK_TOOLCHAIN_VERSION := clang 和 APP_STL := c++_static 是否成功。

看起来您正在混合共享库和静态库所需的逻辑。你真正想在你的应用程序中使用什么？当前逻辑指定 BUILD_SHARED_LIBRARY 但请求 C++ stl 的静态版本。

【参考方案1】：

试试this Google 的音频应用新解决方案。