下载faac源码包，地址：https://sourceforge.net/projects/faac/files/faac-src/faac-1.28/，注意要下载.tar.gz的，我试过.zip中的源码用ndk编译不通过。然后创建一个android项目工程，并创建一个jni目录，并将源码所有文件全部粘贴到jni目录下，如图：
androidStudio编译faac为动态库 
androidStudio编译faac为动态库 其中有一个config.h.in文件，直接去掉后面的.in，让扩展名为.h,否则在frame.h中会报错。
并在jni根目录中创建Android.mk和Application.mk文件。
Android.mk：
LOCAL_PATH := $(call my-dir)
FAAC_TOP := $(LOCAL_PATH)
include $(CLEAR_VARS)
include $(FAAC_TOP)/libfaac/Android.mk
Application.mk:
然后再在libfaac目录中创建一个Android.mk文件。
Android.mk:
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE:= libfaac
LOCAL_SRC_FILES:= \
aacquant.c \
backpred.c \
bitstream.c \
channels.c \
fft.c \
filtbank.c \
frame.c \
huffman.c \
ltp.c \
midside.c \
psychkni.c \
tns.c \
util.c \
LOCAL_C_INCLUDES := \
$(LOCAL_PATH) \
$(FAAC_TOP) \
$(FAAC_TOP)/include
LOCAL_CFLAGS:= -DHAVE_CONFIG_H
include $(BUILD_SHARED_LIBRARY)
在build.gradle中加入：
sourceSets { main { jni.srcDirs = ['src/main/jni/'] } }
externalNativeBuild {
ndkBuild {
path 'src/main/jni/Android.mk'
}
}
然后 rebuild Project项目，执行完后，在如图目录下生成了libfaac.so或者在jni目录中执行ndk-build命令：androidStudio编译faac为动态库
localhost:jni xuyan$ /Users/xuyan/Library/Android/sdk/ndk-bundle/ndk-build
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-
Android NDK: WARNING: APP_PLATFORM android- is higher than android:minSdkVersion in /Users/xuyan/androidproject/AACProject/faac/src/main/AndroidManifest.xml. NDK binaries will *not* be compatible with devices older than android- See https://android.googlesource.com/platform/ndk/+/master/docs/user/common_problems.md for more information.
[arm64-v8a] Compile : faac <= aacquant.c
[arm64-v8a] Compile : faac <= backpred.c
[arm64-v8a] Compile : faac <= bitstream.c
[arm64-v8a] Compile : faac <= channels.c
[arm64-v8a] Compile : faac <= fft.c
[arm64-v8a] Compile : faac <= filtbank.c
[arm64-v8a] Compile : faac <= frame.c
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: warning:
equality comparison with extraneous parentheses [-Wparentheses-equality]
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
remove extraneous parentheses around the comparison to silence this
warning
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~ ^ ~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
use '=' to turn this equality comparison into an assignment
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
^~
=
warning generated.
[arm64-v8a] Compile : faac <= huffman.c
[arm64-v8a] Compile : faac <= ltp.c
[arm64-v8a] Compile : faac <= midside.c
[arm64-v8a] Compile : faac <= psychkni.c
[arm64-v8a] Compile : faac <= tns.c
[arm64-v8a] Compile : faac <= util.c
[arm64-v8a] SharedLibrary : libfaac.so
[arm64-v8a] Install : libfaac.so => libs/arm64-v8a/libfaac.so
[x86_64] Compile : faac <= aacquant.c
[x86_64] Compile : faac <= backpred.c
[x86_64] Compile : faac <= bitstream.c
[x86_64] Compile : faac <= channels.c
[x86_64] Compile : faac <= fft.c
[x86_64] Compile : faac <= filtbank.c
[x86_64] Compile : faac <= frame.c
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: warning:
equality comparison with extraneous parentheses [-Wparentheses-equality]
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
remove extraneous parentheses around the comparison to silence this
warning
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~ ^ ~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
use '=' to turn this equality comparison into an assignment
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
^~
=
warning generated.
[x86_64] Compile : faac <= huffman.c
[x86_64] Compile : faac <= ltp.c
[x86_64] Compile : faac <= midside.c
[x86_64] Compile : faac <= psychkni.c
[x86_64] Compile : faac <= tns.c
[x86_64] Compile : faac <= util.c
[x86_64] SharedLibrary : libfaac.so
[x86_64] Install : libfaac.so => libs/x86_64/libfaac.so
[armeabi-v7a] Compile thumb : faac <= aacquant.c
[armeabi-v7a] Compile thumb : faac <= backpred.c
[armeabi-v7a] Compile thumb : faac <= bitstream.c
[armeabi-v7a] Compile thumb : faac <= channels.c
[armeabi-v7a] Compile thumb : faac <= fft.c
[armeabi-v7a] Compile thumb : faac <= filtbank.c
[armeabi-v7a] Compile thumb : faac <= frame.c
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: warning:
equality comparison with extraneous parentheses [-Wparentheses-equality]
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
remove extraneous parentheses around the comparison to silence this
warning
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~ ^ ~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
use '=' to turn this equality comparison into an assignment
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
^~
=
warning generated.
[armeabi-v7a] Compile thumb : faac <= huffman.c
[armeabi-v7a] Compile thumb : faac <= ltp.c
[armeabi-v7a] Compile thumb : faac <= midside.c
[armeabi-v7a] Compile thumb : faac <= psychkni.c
[armeabi-v7a] Compile thumb : faac <= tns.c
[armeabi-v7a] Compile thumb : faac <= util.c
[armeabi-v7a] SharedLibrary : libfaac.so
[armeabi-v7a] Install : libfaac.so => libs/armeabi-v7a/libfaac.so
[x86] Compile : faac <= aacquant.c
[x86] Compile : faac <= backpred.c
[x86] Compile : faac <= bitstream.c
[x86] Compile : faac <= channels.c
[x86] Compile : faac <= fft.c
[x86] Compile : faac <= filtbank.c
[x86] Compile : faac <= frame.c
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: warning:
equality comparison with extraneous parentheses [-Wparentheses-equality]
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
remove extraneous parentheses around the comparison to silence this
warning
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
~ ^ ~
/Users/xuyan/androidproject/AACProject/faac/src/main/jni/libfaac/frame.c::: note:
use '=' to turn this equality comparison into an assignment
if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
^~
=
warning generated.
[x86] Compile : faac <= huffman.c
[x86] Compile : faac <= ltp.c
[x86] Compile : faac <= midside.c
[x86] Compile : faac <= psychkni.c
[x86] Compile : faac <= tns.c
[x86] Compile : faac <= util.c
[x86] SharedLibrary : libfaac.so
[x86] Install : libfaac.so => libs/x86/libfaac.so
肯定有哥们懒的不愿意自己编译，那我也把编译好的so库贡献出来了，下载地址：https://download.csdn.net/download/xy1213236113/10652226，希望给个好评！