ffmpeg android编译

export PREBUILT=/home/jacklam/works/android-ndk-r8d/toolchains/arm-linux-androideabi-4.7
export PLATFORM=/home/jacklam/works/android-ndk-r8d/platforms/android-8/arch-arm

export TMPDIR=/home/jacklam/works/temp
./configure \
--target-os=linux \
--arch=arm \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-avdevice \
--disable-avfilter \
--disable-postproc \
--disable-swresample \
--disable-avresample \
--disable-symver \
--disable-debug \
--disable-stripping \
--disable-yasm \
--disable-asm \
--enable-gpl \
--enable-version3 \
--enable-nonfree \
--disable-doc \
--enable-static \
--disable-shared \
--enable-cross-compile \
--prefix=/home/jacklam/works/ffmpeg-android-static-lib \
--cc=$PREBUILT/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc \
--cross-prefix=$PREBUILT/prebuilt/linux-x86/bin/arm-linux-androideabi- \
--nm=$PREBUILT/prebuilt/linux-x86/bin/arm-linux-androideabi-nm \
--extra-cflags="-fPIC -DANDROID -I$PLATFORM/usr/include" \
--extra-ldflags="-L$PLATFORM/usr/lib -nostdlib"

首先，创建config.sh（上面的内容）,并让他有执行权限因为FFMPEG会依赖一些库，要提前安装好一些软件，如LOCAL_LDLIBS := -L$(LOCAL_PATH) -lm -lz 中的m和z lib然后，执行.config.shmakemake install就可以编译出静态库文件libavcodec libavformat libavutil libswscale及其头文件然后，把这些文件放到JNI工程中建立ANDROID.MK

# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0 #
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := avformat
LOCAL_SRC_FILES := libavformat.a
LOCAL_CFLAGS :=-Ilibavformat
LOCAL_EXPORT_C_INCLUDES := libavformat
LOCAL_EXPORT_CFLAGS := -Ilibavformat
LOCAL_EXPORT_LDLIBS := -llog
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avcodec
LOCAL_SRC_FILES := libavcodec.a
LOCAL_CFLAGS :=-Ilibavcodec
LOCAL_EXPORT_C_INCLUDES := libavcodec
LOCAL_EXPORT_CFLAGS := -Ilibavcodec
LOCAL_EXPORT_LDLIBS := -llog
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := avutil
LOCAL_SRC_FILES := libavutil.a
LOCAL_CFLAGS :=-Ilibavutil
LOCAL_EXPORT_C_INCLUDES := libavutil
LOCAL_EXPORT_CFLAGS := -Ilibavutil
LOCAL_EXPORT_LDLIBS := -llog

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := swscale
LOCAL_SRC_FILES :=libswscale.a
LOCAL_CFLAGS :=-Ilibavutil -Ilibswscale
LOCAL_EXPORT_C_INCLUDES := libswscale
LOCAL_EXPORT_CFLAGS := -Ilibswscale
LOCAL_EXPORT_LDLIBS := -llog -lavutil
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libjnivideo
LOCAL_SRC_FILES := libjnivideo.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libjniaudio
LOCAL_SRC_FILES := libjniaudio.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE    := hello-jni
LOCAL_C_INCLUDES += $(LOCAL_PATH) \
$(LOCAL_PATH)/include
LOCAL_SRC_FILES := OnLoad.c hello-jni.c
LOCAL_LDLIBS    := -L$(LOCAL_PATH) -lm -lz
LOCAL_STATIC_LIBRARIES := avformat avcodec avutil swscale
LOCAL_SHARED_LIBRARIES := libjniaudio libjnivideo

include $(BUILD_SHARED_LIBRARY)

其中

libjniaudio，libjnivideo

是2.2的AUDIO和VIDEO访问方式

OnLoad.c hello-jni.c

是调用ffmpeg的jni