ijkplayer---compile-ijk.sh分析

#! /usr/bin/env bash
#
# Copyright (C) 2013-2014 Bilibili
# Copyright (C) 2013-2014 Zhang Rui <[email protected]>
#
# 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.
#

#下面这句我认为是错误的，应该是if [ -z "$ANDROID_SDK" -o -z "$ANDROID_NDK" ]; then
#-z判断是否我空  -o 是or或者的意思


if [ -z "$ANDROID_NDK" -o -z "$ANDROID_NDK" ]; then
    echo "You must define ANDROID_NDK, ANDROID_SDK before starting."
    echo "They must point to your NDK and SDK directories.\n"
    exit 1
fi

#REQUEST_TARGET 我们要编译的平台比如arm64 armv7a all等
REQUEST_TARGET=$1
REQUEST_SUB_CMD=$2
ACT_ABI_32="armv5 armv7a x86"
ACT_ABI_64="armv5 armv7a arm64 x86 x86_64"
ACT_ABI_ALL=$ACT_ABI_64
#UNAME_Smac电脑最后为Darwin
UNAME_S=$(uname -s)

#下面这段会形成-j+线程的数目，我的电脑最后会形成-j8
FF_MAKEFLAGS=
if which nproc >/dev/null
then
    FF_MAKEFLAGS=-j`nproc`
elif [ "$UNAME_S" = "Darwin" ] && which sysctl >/dev/null
then
    FF_MAKEFLAGS=-j`sysctl -n machdep.cpu.thread_count`
fi

do_sub_cmd () {
    SUB_CMD=$1
    if [ -L "./android-ndk-prof" ]; then
        rm android-ndk-prof
    fi

#android-ndk-prof会形成一个软连接
#最后的命令会执行ndk-build -j线程的数目
    if [ "$PARAM_SUB_CMD" = 'prof' ]; then
        echo 'profiler build: YES';
        ln -s ../../../../../../ijkprof/android-ndk-profiler/jni android-ndk-prof
    else
        echo 'profiler build: NO';
        ln -s ../../../../../../ijkprof/android-ndk-profiler-dummy/jni android-ndk-prof
    fi

    case $SUB_CMD in
        prof)
            $ANDROID_NDK/ndk-build $FF_MAKEFLAGS
        ;;
        clean)
            $ANDROID_NDK/ndk-build clean
        ;;
        rebuild)
            $ANDROID_NDK/ndk-build clean
            $ANDROID_NDK/ndk-build $FF_MAKEFLAGS
        ;;
        *)
            $ANDROID_NDK/ndk-build $FF_MAKEFLAGS
        ;;
    esac
}

#如果我们target是arm64，那么我们就会进入ijkplayer/ijkplayer-arm64/src/main/jni目录，最后执行ndk-build命令
do_ndk_build () {
    PARAM_TARGET=$1
    PARAM_SUB_CMD=$2
    case "$PARAM_TARGET" in
        armv5|armv7a)
            cd "ijkplayer/ijkplayer-$PARAM_TARGET/src/main/jni"
            do_sub_cmd $PARAM_SUB_CMD
            cd -
        ;;
        arm64|x86|x86_64)
            cd "ijkplayer/ijkplayer-$PARAM_TARGET/src/main/jni"
            if [ "$PARAM_SUB_CMD" = 'prof' ]; then PARAM_SUB_CMD=''; fi
            do_sub_cmd $PARAM_SUB_CMD
            cd -
        ;;
    esac
}


case "$REQUEST_TARGET" in
    "")
        do_ndk_build armv7a;
    ;;
    armv5|armv7a|arm64|x86|x86_64)
        do_ndk_build $REQUEST_TARGET $REQUEST_SUB_CMD;
    ;;
    all32)
        for ABI in $ACT_ABI_32
        do
            do_ndk_build "$ABI" $REQUEST_SUB_CMD;
        done
    ;;
    all|all64)
        for ABI in $ACT_ABI_64
        do
            do_ndk_build "$ABI" $REQUEST_SUB_CMD;
        done
    ;;
    clean)
        for ABI in $ACT_ABI_ALL
        do
            do_ndk_build "$ABI" clean;
        done
    ;;
    *)
        echo "Usage:"
        echo "  compile-ijk.sh armv5|armv7a|arm64|x86|x86_64"
        echo "  compile-ijk.sh all|all32"
        echo "  compile-ijk.sh all64"
        echo "  compile-ijk.sh clean"
    ;;
esac

以target是arm64为例，

最后是在ijkplayer/ijkplayer-arm64/src/main/jni下执行最后执行ndk-build命令。

我们进入ijkplayer/ijkplayer-arm64/src/main/jni看下里面的mk文件

android/ijkplayer/ijkplayer-arm64/src/main/jni/Application.mk

# Copyright (c) 2013-2014 Bilibili
# copyright (c) 2013-2014 Zhang Rui <[email protected]>
#
# This file is part of ijkPlayer.
#
# ijkPlayer is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# ijkPlayer is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with ijkPlayer; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

APP_OPTIM := release  #在release模式下，将编译生成被优化了的二进制的机器码，而debug模块用来生成便于调试的未被优化的二进制机器码。
APP_PLATFORM := android-21  #编译平台
APP_ABI := arm64-v8a  #cpu架构
NDK_TOOLCHAIN_VERSION=4.9 #gcc版本
APP_PIE := false 

APP_STL := stlport_static #使用STLport作为静态库

#c语言编译参数
APP_CFLAGS := -O3 -Wall -pipe \
    -ffast-math \
    -fstrict-aliasing -Werror=strict-aliasing \
    -Wno-psabi -Wa,--noexecstack \
    -DANDROID -DNDEBUG

Android.mk

# Copyright (c) 2013 Bilibili
# copyright (c) 2013 Zhang Rui <[email protected]>
#
# This file is part of ijkPlayer.
#
# ijkPlayer is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# ijkPlayer is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with ijkPlayer; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

LOCAL_PATH := $(call my-dir)

MY_APP_JNI_ROOT := $(realpath $(LOCAL_PATH))
MY_APP_PRJ_ROOT := $(realpath $(MY_APP_JNI_ROOT)/..)
MY_APP_ANDROID_ROOT := $(realpath $(MY_APP_PRJ_ROOT)/../../../..)

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
MY_APP_FFMPEG_OUTPUT_PATH := $(realpath $(MY_APP_ANDROID_ROOT)/contrib/build/ffmpeg-armv7a/output)
MY_APP_FFMPEG_INCLUDE_PATH := $(realpath $(MY_APP_FFMPEG_OUTPUT_PATH)/include)
endif
ifeq ($(TARGET_ARCH_ABI),armeabi)
MY_APP_FFMPEG_OUTPUT_PATH := $(realpath $(MY_APP_ANDROID_ROOT)/contrib/build/ffmpeg-armv5/output)
MY_APP_FFMPEG_INCLUDE_PATH := $(realpath $(MY_APP_FFMPEG_OUTPUT_PATH)/include)
endif
ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
MY_APP_FFMPEG_OUTPUT_PATH := $(realpath $(MY_APP_ANDROID_ROOT)/contrib/build/ffmpeg-arm64/output)
MY_APP_FFMPEG_INCLUDE_PATH := $(realpath $(MY_APP_FFMPEG_OUTPUT_PATH)/include)
endif
ifeq ($(TARGET_ARCH_ABI),x86)
MY_APP_FFMPEG_OUTPUT_PATH := $(realpath $(MY_APP_ANDROID_ROOT)/contrib/build/ffmpeg-x86/output)
MY_APP_FFMPEG_INCLUDE_PATH := $(realpath $(MY_APP_FFMPEG_OUTPUT_PATH)/include)
endif
ifeq ($(TARGET_ARCH_ABI),x86_64)
MY_APP_FFMPEG_OUTPUT_PATH := $(realpath $(MY_APP_ANDROID_ROOT)/contrib/build/ffmpeg-x86_64/output)
MY_APP_FFMPEG_INCLUDE_PATH := $(realpath $(MY_APP_FFMPEG_OUTPUT_PATH)/include)
endif

include $(call all-subdir-makefiles)

定义不同cpu架构ffmpeg库的位置，然后include $(call all-subdir-makefiles)编译每个子目录

通过下面的图片

可以知道 android-ndk-profiler 生成了静态库

ffmpeg是动态库

ijkmedia又是调用子目录

最后我们发现ijkplayer，ijksdl是include $(BUILD_SHARED_LIBRARY)动态库

其余是include $(BUILD_STATIC_LIBRARY)静态库

所以最后我们输出的是三个动态so

ijkplayer---compile-ijk.sh分析

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