Android 用NDK编译FFmpeg（生成Android.mk可以放在源代码框架内编译）

转自：http://www.eoeandroid.com/thread-42184-1-1.html

mkdir jni && cd jni wget http://ffmpeg.org/releases/ffmpeg-0.6.tar.bz2 tar xf ffmpeg-0.6.tar.bz2 && mv ffmpeg-0.6 ffmpeg && cd ffmpeg 复制代码 在ffmpeg下新建一个config.sh，内容如下，注意把PREBUILT和PLATFORM设置正确。另外里面有些参数你也可以自行调整，我主要是为了配置一个播放器而这样设置的。 #!/bin/bash PREBUILT=/home/abitno/Android/android-ndk-r4/build/prebuilt/linux-x86/arm-eabi-4.4.0 PLATFORM=/home/abitno/Android/android-ndk-r4/build/platforms/android-8/arch-arm ./configure --target-os=linux \         --arch=arm \         --enable-version3 \         --enable-gpl \         --enable-nonfree \         --disable-stripping \         --disable-ffmpeg \         --disable-ffplay \         --disable-ffserver \         --disable-ffprobe \         --disable-encoders \         --disable-muxers \         --disable-devices \         --disable-protocols \         --enable-protocol=file \         --enable-avfilter \         --disable-network \         --disable-mpegaudio-hp \         --disable-avdevice \         --enable-cross-compile \         --cc=$PREBUILT/bin/arm-eabi-gcc \         --cross-prefix=$PREBUILT/bin/arm-eabi- \         --nm=$PREBUILT/bin/arm-eabi-nm \         --extra-cflags="-fPIC -DANDROID" \         --disable-asm \         --enable-neon \         --enable-armv5te \         --extra-ldflags="-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib $PREBUILT/lib/gcc/arm-eabi/4.4.0/crtbegin.o $PREBUILT/lib/gcc/arm-eabi/4.4.0/crtend.o -lc -lm -ldl" 复制代码 运行config.sh开始configure chmod +x config.sh ./config.sh 复制代码 configure完成后，编辑刚刚生成的config.h，找到这句 #define restrict restrict 复制代码 Android的GCC不支持restrict关键字，于是修改成下面这样 #define restrict 复制代码 编辑libavutil/libm.h，把其中的static方法都删除。 分别修改libavcodec、libavfilter、libavformat、libavutil、libpostproc和libswscale下的Makefile，把下面两句删除 include $(SUBDIR)../subdir.mak include $(SUBDIR)../config.mak 复制代码 在ffmpeg下添加一个文件av.mk，内容如下 # LOCAL_PATH is one of libavutil, libavcodec, libavformat, or libswscale #include $(LOCAL_PATH)/../config-$(TARGET_ARCH).mak include $(LOCAL_PATH)/../config.mak OBJS := OBJS-yes := MMX-OBJS-yes := include $(LOCAL_PATH)/Makefile # collect objects OBJS-$(HAVE_MMX) += $(MMX-OBJS-yes) OBJS += $(OBJS-yes) FFNAME := lib$(NAME) FFLIBS := $(foreach,NAME,$(FFLIBS),lib$(NAME)) FFCFLAGS  = -DHAVE_AV_CONFIG_H -Wno-sign-compare -Wno-switch -Wno-pointer-sign FFCFLAGS += -DTARGET_CONFIG=\"config-$(TARGET_ARCH).h\" ALL_S_FILES := $(wildcard $(LOCAL_PATH)/$(TARGET_ARCH)/*.S) ALL_S_FILES := $(addprefix $(TARGET_ARCH)/, $(notdir $(ALL_S_FILES))) ifneq ($(ALL_S_FILES),) ALL_S_OBJS := $(patsubst %.S,%.o,$(ALL_S_FILES)) C_OBJS := $(filter-out $(ALL_S_OBJS),$(OBJS)) S_OBJS := $(filter $(ALL_S_OBJS),$(OBJS)) else C_OBJS := $(OBJS) S_OBJS := endif C_FILES := $(patsubst %.o,%.c,$(C_OBJS)) S_FILES := $(patsubst %.o,%.S,$(S_OBJS)) FFFILES := $(sort $(S_FILES)) $(sort $(C_FILES)) 复制代码 接下来要添加一系列的Android.mk，在jni根目录下的内容如下 include $(all-subdir-makefiles) 复制代码 在ffmpeg目录下，Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_STATIC_LIBRARIES := libavformat libavcodec libavutil libpostproc libswscale LOCAL_MODULE := ffmpeg include $(BUILD_SHARED_LIBRARY) include $(call all-makefiles-under,$(LOCAL_PATH)) 复制代码 libavformat/Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) include $(LOCAL_PATH)/../av.mk LOCAL_SRC_FILES := $(FFFILES) LOCAL_C_INCLUDES :=                \         $(LOCAL_PATH)                \         $(LOCAL_PATH)/.. LOCAL_CFLAGS += $(FFCFLAGS) LOCAL_CFLAGS += -include "string.h" -Dipv6mr_interface=ipv6mr_ifindex LOCAL_LDLIBS := -lz LOCAL_STATIC_LIBRARIES := $(FFLIBS) LOCAL_MODULE := $(FFNAME) include $(BUILD_STATIC_LIBRARY) 复制代码 libavcodec/Android.mk LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) include $(LOCAL_PATH)/../av.mk LOCAL_SRC_FILES := $(FFFILES) LOCAL_C_INCLUDES :=                \         $(LOCAL_PATH)                \         $(LOCAL_PATH)/.. LOCAL_CFLAGS += $(FFCFLAGS) LOCAL_LDLIBS := -lz LOCAL_STATIC_LIBRARIES := $(FFLIBS) LOCAL_MODULE := $(FFNAME) include $(BUILD_STATIC_LIBRARY) 复制代码 libavfilter、libavutil、libpostproc和libswscale下的Android.mk内容如下 LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) include $(LOCAL_PATH)/../av.mk LOCAL_SRC_FILES := $(FFFILES) LOCAL_C_INCLUDES :=                \         $(LOCAL_PATH)                \         $(LOCAL_PATH)/.. LOCAL_CFLAGS += $(FFCFLAGS) LOCAL_STATIC_LIBRARIES := $(FFLIBS) LOCAL_MODULE := $(FFNAME) include $(BUILD_STATIC_LIBRARY) 复制代码 最外层的jni/Android.mk和jni/ffmpeg/Android.mk只是随便这样写的，你应该根据自己的需求改写。