APPRO IPNC方案 Android手机监控客户端---ffmpeg移植

以下所有操作均在Ubuntu 10.04 LTS OS上进行

1 环境配置

Ubuntu下Android开发环境的搭建:

http://www.cnblogs.com/softman11/archive/2011/06/22/2086793.html

Ubuntu下安装Android NDK :

http://blog.csdn.net/jumping_android/article/details/7403322

本人JDK安装目录为:

/ipnc_dev/Android/jdk1.6.0_26

Adroid SDK安装目录为:

/ipnc_dev/Android/android-sdk-linux

NDK安装目录为:

/ipnc_dev/Android/android-ndk-r8c

~/.bashrc文件配置为

#for andriod developer
export JAVA_HOME=/ipnc_dev/Android/jdk1.6.0_26
export JRE_HOME=/ipnc_dev/Android/jdk1.6.0_26/jre
export PATH=/ipnc_dev/Android/jdk1.6.0_26/bin:$PATH 
export CLASSPATH=.:/ipnc_dev/Android/jdk1.6.0_26/lib:/ipnc_dev/Android/jdk1.6.0_26/jre/lib
export PATH=/ipnc_dev/Android/android-ndk-r8c:$PATH

2 ffmpeg移植

在/ipnc_dev/Andriod目录下创建文件夹Player,切换到Player目录下,使用下列命令创建一个标准的Android项目ipncPlayer

/ipnc_dev/Android/android-sdk-linux/platforms/tools/android create project -n ipncPlayer -t 8 -p ipncPlayer -k art.abitno.ipncplayer -a PlayerView

然后在ipncPlayer目录里创建jni目录,切换到jni目录下,将Appro IPNC参考设计中的FFMPEG源码复制到该目录下(在原源码中,我自己做了很多修改,主要是内存泄漏相关的,经测试,使用新版本的ffmpeg时,MJPEG码流可以正常播放,但是H.264和MPEG4码流不能打开),该源码是使用经GoDB开发人员使用ffmpeg 0.52源码在windows上修改过的,所以要在移植到Android上,可以先在linux进行编译,看能否通过,之前本人在linux下修改编译通过,具体修改哪几部分源码忘记了,rtsp.c queue.c中修改的比较多,貌似都是关于线程方面的,在linux下使用pthread库函数替代即可.

此时的目录结构如下图所示

切换到FFMPEG目录下,新建一个andriod.config文件,内容如下

#!/bin/bash
PREBUILT=/ipnc_dev/Android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86
PLATFORM=/ipnc_dev/Android/android-ndk-r8c/platforms/android-14/arch-arm
./configure --target-os=linux \
--extra-cflags="-fPIC -DANDROID" \
--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/4.6/crtbegin.o $PREBUILT/lib/gcc/arm-linux-androideabi/4.6/crtend.o -lc -lm -ldl" \
--arch=arm \
--enable-cross-compile \
--enable-armv5te \
--cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
--cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
--enable-version3 \
--enable-gpl \
--enable-nonfree \
--disable-stripping \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--disable-asm \
--enable-neon \
--enable-shared \
--disable-debug \
--enable-small \
--enable-static \
--disable-muxers \
--enable-muxer=avi \
--enable-demuxer=avi \
--enable-demuxer=rtsp \
--enable-demuxer=http \
--disable-bsfs \
--disable-devices \
--disable-encoders \
--enable-encoder=h264 \
--enable-encoder=mpeg4 \
--enable-encoder=mjpeg \
--enable-encoder=pcm_mulaw \
--enable-encoder=aac \
--disable-decoders \
--enable-decoder=h264 \
--enable-decoder=mpeg4 \
--enable-decoder=mjpeg \
--enable-decoder=pcm_mulaw \
--enable-decoder=aac

使用命令 chmod +x android.config添加文件执行权限,终端下运行./android.config进行ffmpeg编译配置,编译配置完成后,打开FFMPEG目录下config.h,

将代码

#define restrict restrict

修改为

#define restrict

据说是Android的GCC不支持restrict关键字,没有亲自测试过.

编辑libavutil/internal.h，把其中的static方法前的static关键字删除.

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

注意这两行并不是连续的.

在FFMPEG目录下添加一个文件ffmpeg.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))

接下来添加一系列的Android.mk，在jni根目录下的内容如下:

include $(all-subdir-makefiles)

FFMPEG目录下的Android.mk内容为:

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))

libavformat/Android.mk内容为:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../ffmpeg.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)

libavcodec/Android.mk内容为:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../ffmpeg.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)

libavfilter、libavutil、libpostproc和libswscale下的Android.mk内容为:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include $(LOCAL_PATH)/../ffmpeg.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)

修改 NDK目录中/build/gmsl/ __gmsl文件的第512行 :

int_encode = $(__gmsl_tr1)$(wordlist 1, $1,$(__gmsl_input_int))

修改为:

int_encode = $(__gmsl_tr1)$(wordlist 1,$(words $1),$(__gmsl_input_int))

否则ndk-build时出现"android-ndk-r8c/build/gmsl/__gmsl:512: *** non-numeric second argument to `wordlist' function: '"错误.

最后在jni目录下运行ndk-build进行编译.

本文主要参照blog:http://blog.sina.com.cn/s/blog_51396f890102dxdn.html