Android底层库打印调试信息到logcat中查看

一、最简单的NDK编译

二、底层库中链接第三方库，在第三方库中加调试信息

include $(CLEAR_VARS)
LOCAL_MODULE := pj_video_android
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../../webrtc/sources/modules/video_render/main/interface 
	$(LOCAL_PATH)/../../../webrtc/sources/modules/video_capture/main/interface 
	$(LOCAL_PATH)/../../../webrtc/sources/modules/interface 
	$(LOCAL_PATH)/../../../webrtc/sources/system_wrappers/interface 
	$(LOCAL_PATH)/../../../webrtc/sources/modules 
	$(LOCAL_PATH)/../../../webrtc/sources 
	$(LOCAL_PATH)/../pjlib/include $(LOCAL_PATH)/../pjlib-util/include 
	$(LOCAL_PATH)/../pjsip/include 
	$(LOCAL_PATH)/../pjnath/include $(LOCAL_PATH)/include $(LOCAL_PATH)/.. 

# We depends on csipsimple at this point because we need service to be stored somewhere
LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../android_sources/pjmedia/include/pjmedia-videodev 
	$(LOCAL_PATH)/../../../swig-glue 
	$(LOCAL_PATH)/../../../csipsimple-wrapper/include

# Ffmpeg codec depend on ffmpeg
LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../../ffmpeg/ffmpeg_src

# Pj implementation for renderer
LOCAL_SRC_FILES += $(PJ_ANDROID_SRC_DIR)/pjmedia-videodev/webrtc_android_render_dev.cpp

# Pj implementation for capture
LOCAL_SRC_FILES += $(PJ_ANDROID_SRC_DIR)/pjmedia-videodev/webrtc_android_capture_dev.cpp

# Ffmpeg codec
LOCAL_SRC_FILES += $(PJMEDIACODEC_SRC_DIR)/ffmpeg_vid_codecs.c 
	$(PJLIB_SRC_DIR)/converter_libswscale.c 
	$(PJLIB_SRC_DIR)/ffmpeg_util.c 
	$(PJMEDIACODEC_SRC_DIR)/h263_packetizer.c 
	$(PJMEDIACODEC_SRC_DIR)/h264_packetizer.c 
	$(PJLIB_SRC_DIR)/vid_codec_util.c

# For render and capture
LOCAL_STATIC_LIBRARIES += libwebrtc_video_render libwebrtc_video_capture

# Common webrtc utility
LOCAL_STATIC_LIBRARIES += libwebrtc_yuv libyuv libwebrtc_apm_utility 
	libwebrtc_system_wrappers libwebrtc_spl

# Ffmpeg codec
BASE_FFMPEG_BUILD_DIR :=  $(LOCAL_PATH)/../../../ffmpeg/build/ffmpeg/$(TARGET_ARCH_ABI)/lib
LOCAL_LDLIBS += $(BASE_FFMPEG_BUILD_DIR)/libavcodec.a 
		$(BASE_FFMPEG_BUILD_DIR)/libavformat.a 
		$(BASE_FFMPEG_BUILD_DIR)/libswscale.a 
		$(BASE_FFMPEG_BUILD_DIR)/libavutil.a

# Add X264	
BASE_X264_BUILD_DIR :=  $(LOCAL_PATH)/../../../ffmpeg/build/x264/$(TARGET_ARCH_ABI)/lib
LOCAL_LDLIBS += $(BASE_X264_BUILD_DIR)/libx264.a
 
# Add ffmpeg to flags for pj part build
LOCAL_CFLAGS := $(MY_PJSIP_FLAGS) -DWEBRTC_ANDROID 
	-DPJMEDIA_HAS_FFMPEG=1 
	-DPJMEDIA_HAS_FFMPEG_CODEC=1 
	-DPJMEDIA_HAS_FFMPEG_CODEC_H264=1

LOCAL_SHARED_LIBRARIES += libpjsipjni
LOCAL_LDLIBS += -lGLESv2 -llog
LOCAL_STATIC_LIBRARIES += libgcc cpufeatures

USE_STAGEFRIGHT_H264:=0
ANDROID_LIBS := ./jni/ffmpeg/ffmpeg_src/android-libs
ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
ifeq ($(USE_STAGEFRIGHT_H264),1)
	LOCAL_LDLIBS += -L$(ANDROID_LIBS) -Wl,-rpath-link,$(ANDROID_LIBS) -lstagefright -lutils -lbinder
endif
endif
include $(BUILD_SHARED_LIBRARY)

在ffmpeg库中加入打印信息并且在logcat查看，不能使用第一种方式，但是原理其实是一样的，都是要利用Android提供的log机制，即都要链接使用

android-ndk-r8e/platforms/android-14/arch-arm/usr/lib/liblog.so（android-ndk-r8e是我使用的NDK版本），那在ffmpeg库中怎么链接liblog.so呢？

1、在我的ffmpeg根目录下，放入jni_log文件夹，放进liblog.so及相应头文件。

2、在./configure后加入liblog.so的路径并指定链接该库

脚本build_ffmpeg.sh是控制ffmpeg编译的，我在其中加入

build_ffmpeg.sh:

#!/bin/bash
pushd `dirname $0`
TARGET_ARCH_ABI=$1
DEST=`pwd`/build/ffmpeg
ANDROID_API_LEVEL=9
minimal_featureset=1
USE_STAGEFRIGHT=0


NDK_ROOT=$(dirname $(which ndk-build))
ndk_gcc_res=$(ndk-build -n -C $NDK_ROOT/samples/hello-jni NDK_LOG=1 APP_ABI=$TARGET_ARCH_ABI APP_PLATFORM=android-$ANDROID_API_LEVEL | grep gcc)
NDK_CROSS_PREFIX=$(echo $ndk_gcc_res | awk '{ print $1 }' | sed 's/gcc//')
NDK_SYSROOT=$(echo $ndk_gcc_res | sed 's/^.*-I([^ ]*)/usr/include .*$/1/')

FLAGS="--cross-prefix=$NDK_CROSS_PREFIX"

case "$TARGET_ARCH_ABI" in
	x86)
		FLAGS="$FLAGS --enable-pic --target-os=linux --arch=x86 --disable-asm "
		;;
	mips)
		FLAGS="$FLAGS --target-os=linux --arch=mips --disable-asm "
		;;
    armeabi-v7a)
        FLAGS="$FLAGS --enable-pic --target-os=linux --arch=arm --cpu=armv7-a"
        ;;
	armeabi)
		FLAGS="$FLAGS --enable-pic --target-os=linux --arch=arm "
		;;
esac

pushd ffmpeg_src

ANDROID_SOURCE=./android-source
ANDROID_LIBS=./android-libs

# stagefright only for armeabi-v7a
if [[ "$TARGET_ARCH_ABI" != "armeabi-v7a" ]]; then
USE_STAGEFRIGHT=0
fi

if [ $USE_STAGEFRIGHT -eq 1 ]; then

if [ ! -d "$ANDROID_SOURCE/frameworks/base" ]; then 
    echo "Fetching Android system base headers"
    git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_frameworks_base.git $ANDROID_SOURCE/frameworks/base
fi
if [ ! -d "$ANDROID_SOURCE/system/core" ]; then
    echo "Fetching Android system core headers"
    git clone --depth=1 --branch gingerbread-release git://github.com/CyanogenMod/android_system_core.git $ANDROID_SOURCE/system/core
fi
if [ ! -d "$ANDROID_LIBS" ]; then
    # Libraries from any froyo/gingerbread device/emulator should work
    # fine, since the symbols used should be available on most of them.
    echo "Fetching Android libraries for linking"
    if [ ! -f "./update-cm-7.0.3-N1-signed.zip" ]; then
        wget http://download.cyanogenmod.com/get/update-cm-7.0.3-N1-signed.zip -P./
    fi
    unzip ./update-cm-7.0.3-N1-signed.zip system/lib/* -d./
    mv ./system/lib $ANDROID_LIBS
    rmdir ./system
fi

fi


# actual build
FLAGS="$FLAGS --sysroot=$NDK_SYSROOT"
FLAGS="$FLAGS --disable-shared --disable-symver"
FLAGS="$FLAGS --disable-everything"
#FLAGS="$FLAGS --enable-small"
FLAGS="$FLAGS --enable-gpl"
FLAGS="$FLAGS --enable-runtime-cpudetect"

# For h263
FLAGS="$FLAGS --enable-decoder=h263 --enable-encoder=h263"

#For x264
FLAGS="$FLAGS --enable-encoder=libx264 --enable-parser=h264"
FLAGS="$FLAGS --enable-libx264"
if [ $USE_STAGEFRIGHT -eq 1 ]; then
FLAGS="$FLAGS --enable-libstagefright-h264 --enable-decoder=libstagefright_h264"
else
FLAGS="$FLAGS --enable-decoder=h264"
fi

X264_LIBS=../build/x264/$TARGET_ARCH_ABI/lib
X264_INCLUDES=../build/x264/$TARGET_ARCH_ABI/include


ABI=$TARGET_ARCH_ABI
case "$TARGET_ARCH_ABI" in
	neon)
        # --- THIS IS NEVER USED FOR NOW ---
		EXTRA_CFLAGS="$EXTRA_CFLAGS -march=armv7-a -mfloat-abi=softfp -mfpu=neon"
		EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--fix-cortex-a8"
		# Runtime choosing neon vs non-neon requires
		# renamed files
		ABI="armeabi-v7a-neon"
		;;
	armeabi-v7a)
		EXTRA_CFLAGS="$EXTRA_CFLAGS -march=armv7-a -mfloat-abi=softfp"
		;;
esac

DEST="$DEST/$ABI"
FLAGS="$FLAGS --prefix=$DEST"

# CXX
EXTRA_CXXFLAGS="-Wno-multichar -fno-exceptions -fno-rtti"

X264 libs and includes
EXTRA_CFLAGS="$EXTRA_CFLAGS -I$X264_INCLUDES"
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -L$X264_LIBS -Wl,-rpath-link,$X264_LIBS"

# Stagefright
if [ $USE_STAGEFRIGHT -eq 1 ]; then
    EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/include -I$ANDROID_SOURCE/system/core/include"
    EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/media/libstagefright"
    EXTRA_CFLAGS="$EXTRA_CFLAGS -I$ANDROID_SOURCE/frameworks/base/include/media/stagefright/openmax"
    EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_ROOT/sources/cxx-stl/system/include"
    EXTRA_LDFLAGS="$EXTRA_LDFLAGS -L$ANDROID_LIBS -Wl,-rpath-link,$ANDROID_LIBS"
fi

#20141125 lyn add log to ffmpeg
LOG_LIBS=../jni_log/lib
LOG_INCLUDES=../jni_log/include
EXTRA_CFLAGS="$EXTRA_CFLAGS -I$LOG_INCLUDES"
EXTRA_LDFLAGS="$EXTRA_LDFLAGS -L$LOG_LIBS -llog"

mkdir -p $DEST
./configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" --extra-cxxflags="$EXTRA_CXXFLAGS" | tee $DEST/configuration.txt
make clean
make -j4 || exit 1
make install || exit 1

popd; popd

3、在ffmpeg源文件中加头文件，宏定义及打印信息
我在ffmpeg_src/libavcodec/libx264.c中加入

#include "../jni_log/include/log.h"//lyn
//#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, "libpj_video_android", __VA_ARGS__)
//#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG  , "libpj_video_android", __VA_ARGS__)
//#define LOGI(...) __android_log_print(ANDROID_LOG_INFO   , "libpj_video_android", __VA_ARGS__)
//#define LOGW(...) __android_log_print(ANDROID_LOG_WARN   , "libpj_video_android", __VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR  , "libpj_video_android", __VA_ARGS__)

LOGE("ffmpeg-android-log-test=%d",123);或LOGE("ffmpeg-android-log-test");

编译结束后，需要链接，若出__android_log_print未定义的错误，则说明没有把liblog.so链接进去。

三、有的开源库编译，configure并没有提供--extra-ldflags参数让你链接其他库，这时该怎么办呢？

如我在ffmpeg库中加入vpx库，想在vpx源码中加打印，vpx_src/build/make/configue.sh并没有提供--extra-ldflags。

configure.sh：

show_help_pre(){
    for opt in ${CMDLINE_SELECT}; do
        opt2=`echo $opt | sed -e 's;_;-;g'`
        if enabled $opt; then
            eval "toggle_${opt}="--disable-${opt2}""
        else
            eval "toggle_${opt}="--enable-${opt2} ""
        fi
    done

    cat <<EOF
Usage: configure [options]
Options:

Build options:
  --help                      print this message
  --log=yes|no|FILE           file configure log is written to [config.log]
  --target=TARGET             target platform tuple [generic-gnu]
  --cpu=CPU                   optimize for a specific cpu rather than a family
  --extra-cflags=ECFLAGS      add ECFLAGS to CFLAGS [$CFLAGS]
  ${toggle_extra_warnings}    emit harmless warnings (always non-fatal)
  ${toggle_werror}            treat warnings as errors, if possible
                              (not available with all compilers)
  ${toggle_optimizations}     turn on/off compiler optimization flags
  ${toggle_pic}               turn on/off Position Independent Code
  ${toggle_ccache}            turn on/off compiler cache
  ${toggle_debug}             enable/disable debug mode
  ${toggle_gprof}             enable/disable gprof profiling instrumentation
  ${toggle_gcov}              enable/disable gcov coverage instrumentation
  ${toggle_thumb}             enable/disable building arm assembly in thumb mode

Install options:
  ${toggle_install_docs}      control whether docs are installed
  ${toggle_install_bins}      control whether binaries are installed
  ${toggle_install_libs}      control whether libraries are installed
  ${toggle_install_srcs}      control whether sources are installed


EOF
}

修改configure.sh，加入--extra-ldflags接口说明及相应功能：

1、show_help_pre()中加入：“--extra-ldflags=ELDFLAGS   add ELDFLAGS to LDFLAGS”

2、process_common_cmdline()中加入：

--extra-ldflags=*)

LDFLAGS="$LDFLAGS ${optval}"
;;

show_help_pre(){
    for opt in ${CMDLINE_SELECT}; do
        opt2=`echo $opt | sed -e 's;_;-;g'`
        if enabled $opt; then
            eval "toggle_${opt}="--disable-${opt2}""
        else
            eval "toggle_${opt}="--enable-${opt2} ""
        fi
    done

    cat <<EOF
Usage: configure [options]
Options:

Build options:
  --help                      print this message
  --log=yes|no|FILE           file configure log is written to [config.log]
  --target=TARGET             target platform tuple [generic-gnu]
  --cpu=CPU                   optimize for a specific cpu rather than a family
  --extra-cflags=ECFLAGS      add ECFLAGS to CFLAGS [$CFLAGS]
  --extra-ldflags=ELDFLAGS    add ELDFLAGS to LDFLAGS
  ${toggle_extra_warnings}    emit harmless warnings (always non-fatal)
  ${toggle_werror}            treat warnings as errors, if possible
                              (not available with all compilers)
  ${toggle_optimizations}     turn on/off compiler optimization flags
  ${toggle_pic}               turn on/off Position Independent Code
  ${toggle_ccache}            turn on/off compiler cache
  ${toggle_debug}             enable/disable debug mode
  ${toggle_gprof}             enable/disable gprof profiling instrumentation
  ${toggle_gcov}              enable/disable gcov coverage instrumentation
  ${toggle_thumb}             enable/disable building arm assembly in thumb mode

Install options:
  ${toggle_install_docs}      control whether docs are installed
  ${toggle_install_bins}      control whether binaries are installed
  ${toggle_install_libs}      control whether libraries are installed
  ${toggle_install_srcs}      control whether sources are installed


EOF
}

process_common_cmdline() {
    for opt in "$@"; do
        optval="${opt#*=}"
        case "$opt" in
        --child) enable_feature child
        ;;
        --log*)
        logging="$optval"
        if ! disabled logging ; then
            enabled logging || logfile="$logging"
        else
            logfile=/dev/null
        fi
        ;;
        --target=*) toolchain="${toolchain:-${optval}}"
        ;;
        --force-target=*) toolchain="${toolchain:-${optval}}"; enable_feature force_toolchain
        ;;
        --cpu)
        ;;
        --cpu=*) tune_cpu="$optval"
        ;;
        --extra-cflags=*)
        extra_cflags="${optval}"
        ;;
        --extra-ldflags=*)
        LDFLAGS="$LDFLAGS ${optval}"
        ;;
        --enable-?*|--disable-?*)
        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
        if echo "${ARCH_EXT_LIST}" | grep "^ *$option$" >/dev/null; then
            [ $action = "disable" ] && RTCD_OPTIONS="${RTCD_OPTIONS}${opt} "
        elif [ $action = "disable" ] && ! disabled $option ; then
          echo "${CMDLINE_SELECT}" | grep "^ *$option$" >/dev/null ||
            die_unknown $opt
        elif [ $action = "enable" ] && ! enabled $option ; then
          echo "${CMDLINE_SELECT}" | grep "^ *$option$" >/dev/null ||
            die_unknown $opt
        fi
        ${action}_feature $option
        ;;
        --require-?*)
        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
        if echo "${ARCH_EXT_LIST}" none | grep "^ *$option$" >/dev/null; then
            RTCD_OPTIONS="${RTCD_OPTIONS}${opt} "
        else
            die_unknown $opt
        fi
        ;;
        --force-enable-?*|--force-disable-?*)
        eval `echo "$opt" | sed 's/--force-/action=/;s/-/ option=/;s/-/_/g'`
        ${action}_feature $option
        ;;
        --libc=*)
        [ -d "${optval}" ] || die "Not a directory: ${optval}"
        disable_feature builtin_libc
        alt_libc="${optval}"
        ;;
        --as=*)
        [ "${optval}" = yasm -o "${optval}" = nasm -o "${optval}" = auto ] 
            || die "Must be yasm, nasm or auto: ${optval}"
        alt_as="${optval}"
        ;;
        --prefix=*)
        prefix="${optval}"
        ;;
        --libdir=*)
        libdir="${optval}"
        ;;
        --sdk-path=*)
        [ -d "${optval}" ] || die "Not a directory: ${optval}"
        sdk_path="${optval}"
        ;;
        --libc|--as|--prefix|--libdir|--sdk-path)
        die "Option ${opt} requires argument"
        ;;
        --help|-h) show_help
        ;;
        *) die_unknown $opt
        ;;
        esac
    done
}

总结：通过上述方法，可以在Android底层中的任何地方加入你要的调试信息。

注意：有时发现加了调试信息，重新编译后并没有把所加信息打印出来，可能是因为总库（libpj_video_android.so）链接的还是原来的静态库（如libavcodec.a），记得在ffmpeg中make clean并删除总库重新生成。

四、补充（以下内容是转的）

最后

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