android-ndk-r7b编译ffmpeg0.10

1、编写 mk 文件

      1.1 在/home/yinjk/FFMPEG/ffmpegDir/jni目录中创建一个 Android.mk 文件，内容如下

include $(all-subdir-makefiles)

      1.2、在 /home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg目录中创建一个 Android.mk 文件，内容如下

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_WHOLE_STATIC_LIBRARIES := libavutil  libavcodec libpostproc libswscale libavformat libswresample libavfilter
LOCAL_ARM_MODE := arm
LOCAL_MODULE := ffmpeg
include $(BUILD_SHARED_LIBRARY)
include $(call all-makefiles-under,$(LOCAL_PATH))

      1.3、在 /home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg目录中创建一个 av.mk 文件，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))

      1.4、在 /home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg/libavcodec 目录中创建一个 Android.mk 文件，内容如下

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_ARM_MODE := arm
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)

      1.5、在 /home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg/libavformat 目录中创建一个 Android.mk 文件，内容如下

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_ARM_MODE := arm
LOCAL_SRC_FILES :=$(FFFILES)
LOCAL_C_INCLUDES:=  \
 $(LOCAL_PATH)  \
 $(LOCAL_PATH)/..
LOCAL_CFLAGS += $(FFCFLAGS)
LOCAL_CFLAGS += -include "string.h" -Dipv6mr_interface=ipv6mr_ifindex
LOCAL_LDLIBS := -lz
LOCAL_SHARED_LIBRARIES := $(FFLIBS)
LOCAL_MODULE:= $(FFNAME)
include $(BUILD_STATIC_LIBRARY)

      1.6、在 libavfilter、libavutil、libpostproc、libswscale和libswresample 目录中各创建一个 Android.mk 文件，内容如下

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../av.mk
LOCAL_ARM_MODE := arm
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)

2、修改 libm.h 文件和 Makefile 文件

      2.1、编辑/home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg/libavutil 目录中的 libm.h 文件，删除所有static 方法
      2.2、编辑 libavcodec、libavfilter、libavformat、libavutil、libpostproc 、libswresample 和 libswscale 目录中的 Makefile 文件，删除

      include $(SUBDIR)../subdir.mak
      和
      include $(SUBDIR)../config.mak
      两行

3、生成 config.h 文件

      3.1、在/home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg目录中创建一个 config.sh 文件，使用 Android NDK r7b 编译时内容如下：

#!/bin/bash

PREBUILT=/home/yinjk/FFMPEG/android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
PLATFORM=/home/yinjk/FFMPEG/android-ndk-r7b/platforms/android-14/arch-arm

./configure --target-os=linux \
--arch=arm \
--enable-version3 \
--enable-gpl \
--enable-nonfree \
--enable-small \
--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-avdevice \
--enable-cross-compile \
--cc=$PREBUILT/bin/arm-linux-androideabi-gcc-4.4.3 \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
--extra-cflags="-fPIC -DANDROID" \
--disable-asm \
--enable-neon \
--enable-armv5te \
--extra-ldflags="-Wl,-T,$PREBUILT/arm-linux-androideabi/lib/ldscripts/armelf_linux_eabi.x -Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtbegin.o $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtend.o -lc -lm -ldl"

      3.2、打开终端，进入 /home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg目录，运行下面的命令

chmod +x config.sh
./config.sh

后生成config.h和config.mak文件，config.mak文件可不必关心。  

3.3、编辑/home/yinjk/FFMPEG/ffmpegDir/jni/ffmpeg目录中的 config.h 文件，将

#define restrict restrict

修改为

#define restrict

4、 开始编译 FFmpeg

执行命令 /home/yinjk/FFMPEG/android-ndk-r7b/ndk-build NDK_PROJECT_PATH=/home/yinjk/FFMPEG/ffmpegDir

编译完成后显示如下信息：

StaticLibrary  : libavfilter.a
SharedLibrary  : libffmpeg.so
Install        : libffmpeg.so => libs/armeabi/libffmpeg.so

到此编译完成。