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926 lines
28 KiB
926 lines
28 KiB
# 最简单的基于FFmpeg的移动端例子：IOS HelloWorld
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本文记录IOS平台下基于FFmpeg的HelloWorld程序。该示例C语言的源代码来自于《最简单的基于FFMPEG的Helloworld程序》。相关的概念就不再重复记录了。
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**IOS程序使用FFmpeg类库的说明**
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IOS应用程序使用FFmpeg类库的流程如下所示。
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# 1、编译FFmpeg类库
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编译IOS的FFmpeg类库需要支持5种架构：armv7、armv7s、arm64、i386、x86_64。其中前面3个是给真机使用的，后面2个是给模拟器使用的。本文记录的FFmpeg类库还支持第三方类库libx264和libfaac，所以在编译之前还要先编译libx264和libfaac的源代码。总体说来，IOS下的类库需要编译成两个版本：thin和fat。每种架构对应一个thin版本的类库，将这些不同架构thin版本的类库合成起来之后，就形成了fat版本的类库。下面简单记录一下编译步骤。编译过程中IOS SDK版本为8.3，FFmpeg版本为2.7.1，faac和x264分别使用了最新版本的源代码。
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### 1.1 第三方库libx264的编译
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这一步用于生成支持armv7、armv7s、arm64、i386、x86_64几种架构的fat版本的libx264.a。下面这个脚本可以首先编译生成上面5种架构的thin版本的libx264.a，分成5个文件夹存储于thin-x264文件夹中；然后将这些类库合并成为1个fat版本的libx264.a，存储于fat-x264文件夹中。
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#### 1.1.1 build_x264.sh
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```
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#!/bin/sh
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# LXH,MXY
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#
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# directories
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SOURCE="x264"
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FAT="fat-x264"
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SCRATCH="scratch-x264"
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# must be an absolute path
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THIN=`pwd`/"thin-x264"
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#This is decided by your SDK version.
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SDK_VERSION="8.3"
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cd ./x264
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#============== simulator ===============
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PLATFORM="iPhoneSimulator"
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#i386
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ARCHS="i386"
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export DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/${PLATFORM}.platform/Developer
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export SDKROOT=$DEVROOT/SDKs/${PLATFORM}${SDK_VERSION}.sdk
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export CC=$DEVROOT/usr/bin/gcc
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export LD=$DEVROOT/usr/bin/ld
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export CXX=$DEVROOT/usr/bin/g++
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export LIBTOOL=$DEVROOT/usr/bin/libtool
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export HOST=i386-apple-darwin
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COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -fPIC"
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export LDFLAGS="${COMMONFLAGS} -fPIC"
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export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
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for ARCH in $ARCHS; do
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echo "Building $ARCH ......"
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make clean
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./configure \
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--host=i386-apple-darwin \
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--sysroot=$SDKROOT \
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--prefix="$THIN/$ARCH" \
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--extra-cflags="-arch $ARCH -miphoneos-version-min=6.0" \
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--extra-ldflags="-L$SDKROOT/usr/lib/system -arch $ARCH -miphoneos-version-min=6.0" \
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--enable-pic \
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--enable-static \
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--disable-asm \
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make && make install && make clean
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echo "Installed: $DEST/$ARCH"
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done
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#x86_64
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ARCHS="x86_64"
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unset DEVROOT
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unset SDKROOT
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unset CC
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unset LD
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unset CXX
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unset LIBTOOL
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unset HOST
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unset LDFLAGS
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unset CFLAGS
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make clean
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for ARCH in $ARCHS; do
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echo "Building $ARCH ......"
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./configure \
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--prefix="$THIN/$ARCH" \
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--enable-pic \
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--enable-static \
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--disable-asm \
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make && make install && make clean
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echo "Installed: $DEST/$ARCH"
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done
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#================ iphone ==================
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export PLATFORM="iPhoneOS"
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ARCHS="arm64 armv7 armv7s "
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export DEVROOT=/Applications/Xcode.app/Contents/Developer
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export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk
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#DEVPATH=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS${SDK_VERSION}.sdk
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export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
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export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as
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COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -marm -fPIC"
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export LDFLAGS="${COMMONFLAGS} -fPIC"
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export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
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export CXXFLAGS="${COMMONFLAGS} -fvisibility=hidden -fvisibility-inlines-hidden"
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for ARCH in $ARCHS; do
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echo "Building $ARCH ......"
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./configure \
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--host=arm-apple-darwin \
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--sysroot=$DEVPATH \
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--prefix="$THIN/$ARCH" \
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--extra-cflags="-arch $ARCH" \
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--extra-ldflags="-L$DEVPATH/usr/lib/system -arch $ARCH" \
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--enable-pic \
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--enable-static \
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--disable-asm
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make && make install && make clean
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echo "Installed: $DEST/$ARCH"
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done
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cd ..
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#================ fat lib ===================
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ARCHS="armv7 armv7s i386 x86_64 arm64"
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echo "building fat binaries..."
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mkdir -p $FAT/lib
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set - $ARCHS
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CWD=`pwd`
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cd $THIN/$1/lib
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for LIB in *.a
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do
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cd $CWD
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lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB
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done
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cd $CWD
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cp -rf $THIN/$1/include $FAT
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```
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### 1.2 第三方库libfaac的编译
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这一步用于生成支持armv7、armv7s、arm64、i386、x86_64几种架构的fat版本的libfaac.a。下面这个脚本可以首先编译生成上面5种架构的thin版本的libfaac.a，分成5个文件夹存储于fat-faac中；然后将这些类库合并成为1个fat版本的libfaac.a，存储于fat-faac中。
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#### 1.2.1build_faac.sh
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```
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#!/bin/sh
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cd ./faac
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make distclean
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cd ..
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CONFIGURE_FLAGS="--enable-static --with-pic"
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ARCHS="arm64 armv7s x86_64 i386 armv7"
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# directories
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SOURCE="faac"
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FAT="fat-faac"
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SCRATCH="scratch-faac"
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# must be an absolute path
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THIN=`pwd`/"thin-faac"
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COMPILE="y"
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LIPO="y"
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if [ "$*" ]
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then
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if [ "$*" = "lipo" ]
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then
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# skip compile
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COMPILE=
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else
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ARCHS="$*"
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if [ $# -eq 1 ]
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then
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# skip lipo
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LIPO=
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fi
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fi
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fi
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if [ "$COMPILE" ]
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then
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CWD=`pwd`
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for ARCH in $ARCHS
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do
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echo "building $ARCH..."
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mkdir -p "$SCRATCH/$ARCH"
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cd "$SCRATCH/$ARCH"
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if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
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then
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PLATFORM="iPhoneSimulator"
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CPU=
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if [ "$ARCH" = "x86_64" ]
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then
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SIMULATOR="-mios-simulator-version-min=7.0"
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HOST=
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else
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SIMULATOR="-mios-simulator-version-min=5.0"
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HOST="--host=i386-apple-darwin"
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fi
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else
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PLATFORM="iPhoneOS"
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if [ $ARCH = "armv7s" ]
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then
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CPU="--cpu=swift"
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else
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CPU=
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fi
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SIMULATOR=
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HOST="--host=arm-apple-darwin"
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fi
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XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
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CC="xcrun -sdk $XCRUN_SDK clang -Wno-error=unused-command-line-argument-hard-error-in-future"
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AS="/usr/local/bin/gas-preprocessor.pl $CC"
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CFLAGS="-arch $ARCH $SIMULATOR"
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CXXFLAGS="$CFLAGS"
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LDFLAGS="$CFLAGS"
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CC=$CC CFLAGS=$CXXFLAGS LDFLAGS=$LDFLAGS CPPFLAGS=$CXXFLAGS CXX=$CC CXXFLAGS=$CXXFLAGS $CWD/$SOURCE/configure \
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$CONFIGURE_FLAGS \
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$HOST \
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--prefix="$THIN/$ARCH" \
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--disable-shared \
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--without-mp4v2
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make clean && make && make install-strip
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cd $CWD
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done
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fi
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#================ fat lib ===================
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echo "building fat binaries..."
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mkdir -p $FAT/lib
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set - $ARCHS
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CWD=`pwd`
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cd $THIN/$1/lib
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for LIB in *.a
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do
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cd $CWD
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lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB
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done
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cd $CWD
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cp -rf $THIN/$1/include $FAT
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```
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### 1.3 编译armv7版本FFmpeg类库
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这一步用于生成支持armv7架构的thin版本的FFmpeg类库，存储于thin-ffmpeg/armv7文件夹中。脚本如下所示。
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#### 1.3.1 build_ffmpeg_demo_armv7.sh
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```
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#!/bin/sh
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# LXH,MXY modified
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cd ffmpeg
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PLATFORM="iPhoneOS"
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INSTALL="thin-ffmpeg"
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SDK_VERSION="8.3"
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# libx264
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export X264ROOT=../thin-x264/armv7
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export X264LIB=$X264ROOT/lib
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export X264INCLUDE=$X264ROOT/include
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# libfaac
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export FAACROOT=../thin-faac/armv7
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export FAACLIB=$FAACROOT/lib
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export FAACINCLUDE=$FAACROOT/include
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export DEVROOT=/Applications/Xcode.app/Contents/Developer
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export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk
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export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
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export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as
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COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -marm -fPIC"
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export LDFLAGS="${COMMONFLAGS} -fPIC"
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export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
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export CXXFLAGS="${COMMONFLAGS} -fvisibility=hidden -fvisibility-inlines-hidden"
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echo "Building armv7..."
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make clean
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./configure \
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--cpu=cortex-a9 \
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--extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch armv7 -miphoneos-version-min=5.0 -mthumb' \
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--extra-ldflags='-L$X264LIB -L$FAACLIB -arch armv7 -miphoneos-version-min=5.0' \
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--enable-cross-compile \
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--arch=arm --disable-iconv\
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--target-os=darwin \
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--cc=${CC} --disable-asm\
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--sysroot=${SDKROOT} \
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--prefix=../${INSTALL}/armv7 \
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--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \
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--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \
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--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \
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--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \
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--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=mpegts --enable-demuxer=avi --enable-demuxer=mpc --enable-demuxer=mov \
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--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \
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--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \
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--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \
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--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug
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make
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make install
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cd ..
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```
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### 1.4 编译armv7s版本FFmpeg类库
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这一步用于生成支持armv7s架构的thin版本的FFmpeg类库，存储于thin-ffmpeg/armv7s文件夹中。脚本如下所示。
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#### 1.4.1 build_ffmpeg_demo_armv7s.sh
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```
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#!/bin/sh
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# LXH,MXY modified
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cd ffmpeg
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PLATFORM="iPhoneOS"
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INSTALL="thin-ffmpeg"
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SDK_VERSION="8.3"
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# libx264
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export X264ROOT=../thin-x264/armv7s
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export X264LIB=$X264ROOT/lib
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export X264INCLUDE=$X264ROOT/include
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# libfaac
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export FAACROOT=../thin-faac/armv7s
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export FAACLIB=$FAACROOT/lib
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export FAACINCLUDE=$FAACROOT/include
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export DEVROOT=/Applications/Xcode.app/Contents/Developer
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export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk
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export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
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export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as
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COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -marm -fPIC"
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export LDFLAGS="${COMMONFLAGS} -fPIC"
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export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
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export CXXFLAGS="${COMMONFLAGS} -fvisibility=hidden -fvisibility-inlines-hidden"
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echo "Building armv7s..."
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make clean
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./configure \
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--cpu=cortex-a9 \
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--extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch armv7s -miphoneos-version-min=5.0 -mthumb' \
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--extra-ldflags='-L$X264LIB -L$FAACLIB -arch armv7s -miphoneos-version-min=5.0' \
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--enable-cross-compile \
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--arch=arm --disable-iconv\
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--target-os=darwin \
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--cc=${CC} --disable-asm \
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--sysroot=${SDKROOT} \
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--prefix=../${INSTALL}/armv7s \
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--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \
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--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \
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--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \
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--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \
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--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpegts --enable-demuxer=mpc --enable-demuxer=mov \
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--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \
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--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \
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--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \
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--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug
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make
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make install
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cd ..
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```
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### 1.5 编译arm64版本FFmpeg类库
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这一步用于生成支持arm64架构的thin版本的FFmpeg类库，存储于thin-ffmpeg/arm64文件夹中。脚本如下所示。
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#### 1.5.1 build_ffmpeg_demo_arm64.sh
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```
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#!/bin/sh
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# LXH,MXY modified
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cd ffmpeg
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PLATFORM="iPhoneOS"
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INSTALL="thin-ffmpeg"
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SDK_VERSION="8.3"
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# libx264
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export X264ROOT=../thin-x264/arm64
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export X264LIB=$X264ROOT/lib
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export X264INCLUDE=$X264ROOT/include
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# libfaac
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export FAACROOT=../thin-faac/arm64
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export FAACLIB=$FAACROOT/lib
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export FAACINCLUDE=$FAACROOT/include
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export DEVROOT=/Applications/Xcode.app/Contents/Developer
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export SDKROOT=$DEVROOT/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDK_VERSION}.sdk
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export CC=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
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export AS=$DEVROOT/Toolchains/XcodeDefault.xctoolchain/usr/bin/as
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COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -marm -fPIC"
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export LDFLAGS="${COMMONFLAGS} -fPIC"
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export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
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export CXXFLAGS="${COMMONFLAGS} -fvisibility=hidden -fvisibility-inlines-hidden"
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echo "Building arm64..."
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make clean
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./configure \
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--extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch arm64 -miphoneos-version-min=5.0 -mthumb' \
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--extra-ldflags='-L$X264LIB -L$FAACLIB -arch arm64 -miphoneos-version-min=5.0' \
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--enable-cross-compile \
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|
--arch=arm --disable-iconv \
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--target-os=darwin \
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--cc=${CC} --disable-asm \
|
|
--sysroot=${SDKROOT} \
|
|
--prefix=../${INSTALL}/arm64 \
|
|
--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \
|
|
--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \
|
|
--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \
|
|
--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \
|
|
--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpegts --enable-demuxer=mpc --enable-demuxer=mov \
|
|
--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \
|
|
--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \
|
|
--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \
|
|
--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug
|
|
|
|
make
|
|
make install
|
|
|
|
cd ..
|
|
```
|
|
|
|
### 1.6 编译i386版本FFmpeg类库
|
|
|
|
这一步用于生成支持i386架构的thin版本的FFmpeg类库，存储于thin-ffmpeg/i386文件夹中。脚本如下所示。
|
|
|
|
#### 1.6.1 build_ffmpeg_demo_i386.sh
|
|
|
|
```
|
|
build_ffmpeg_demo_i386.sh
|
|
#!/bin/sh
|
|
# LXH,MXY modified
|
|
|
|
cd ffmpeg
|
|
|
|
PLATFORM="iPhoneSimulator"
|
|
INSTALL="thin-ffmpeg"
|
|
SDK_VERSION="8.3"
|
|
|
|
# libx264
|
|
export X264ROOT=../thin-x264/i386
|
|
export X264LIB=$X264ROOT/lib
|
|
export X264INCLUDE=$X264ROOT/include
|
|
# libfaac
|
|
export FAACROOT=../thin-faac/i386
|
|
export FAACLIB=$FAACROOT/lib
|
|
export FAACINCLUDE=$FAACROOT/include
|
|
|
|
export DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/${PLATFORM}.platform/Developer
|
|
export SDKROOT=$DEVROOT/SDKs/${PLATFORM}${SDK_VERSION}.sdk
|
|
export CC=$DEVROOT/usr/bin/gcc
|
|
export LD=$DEVROOT/usr/bin/ld
|
|
|
|
export CXX=$DEVROOT/usr/bin/g++
|
|
|
|
export LIBTOOL=$DEVROOT/usr/bin/libtool
|
|
|
|
COMMONFLAGS="-pipe -gdwarf-2 -no-cpp-precomp -isysroot ${SDKROOT} -fPIC"
|
|
export LDFLAGS="${COMMONFLAGS} -fPIC"
|
|
export CFLAGS="${COMMONFLAGS} -fvisibility=hidden"
|
|
|
|
|
|
echo "Building i386..."
|
|
make clean
|
|
./configure \
|
|
--cpu=i386 \
|
|
--extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE -arch i386 -miphoneos-version-min=5.0' \
|
|
--extra-ldflags='-L$X264LIB -L$FAACLIB -arch i386 -miphoneos-version-min=5.0' \
|
|
--enable-cross-compile \
|
|
--arch=i386 --disable-iconv \
|
|
--target-os=darwin \
|
|
--cc=${CC} \
|
|
--sysroot=${SDKROOT} \
|
|
--prefix=../${INSTALL}/i386 \
|
|
--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \
|
|
--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=libfaac \
|
|
--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=mpegts --enable-muxer=ipod --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \
|
|
--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \
|
|
--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=mpegts --enable-demuxer=avi --enable-demuxer=mpc --enable-demuxer=mov \
|
|
--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \
|
|
--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \
|
|
--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \
|
|
--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug
|
|
|
|
make
|
|
make install
|
|
|
|
cd ..
|
|
```
|
|
|
|
### 1.7 编译x86_64版本FFmpeg类库
|
|
|
|
这一步用于生成支持x86_64架构的thin版本的FFmpeg类库，存储于thin-ffmpeg/x86_64文件夹中。脚本如下所示。
|
|
|
|
#### 1.7.1 build_ffmpeg_demo_x86_64.sh
|
|
|
|
```
|
|
#!/bin/sh
|
|
# LXH,MXY modified
|
|
|
|
cd ./ffmpeg
|
|
|
|
INSTALL="thin-ffmpeg"
|
|
|
|
# libx264
|
|
export X264ROOT=../thin-x264/x86_64
|
|
export X264LIB=$X264ROOT/lib
|
|
export X264INCLUDE=$X264ROOT/include
|
|
# libfaac
|
|
export FAACROOT=../thin-faac/x86_64
|
|
export FAACLIB=$FAACROOT/lib
|
|
export FAACINCLUDE=$FAACROOT/include
|
|
|
|
unset DEVROOT
|
|
unset SDKROOT
|
|
unset CC
|
|
unset LD
|
|
unset CXX
|
|
unset LIBTOOL
|
|
unset HOST
|
|
unset LDFLAGS
|
|
unset CFLAGS
|
|
|
|
echo "Building x86_64..."
|
|
|
|
make clean
|
|
./configure \
|
|
--extra-cflags='-I$X264INCLUDE -I$FAACINCLUDE' \
|
|
--extra-ldflags='-L$X264LIB -L$FAACLIB' \
|
|
--disable-iconv \
|
|
--disable-asm \
|
|
--prefix=../${INSTALL}/x86_64 \
|
|
--enable-gpl --enable-nonfree --enable-version3 --disable-bzlib --enable-small --disable-vda \
|
|
--disable-encoders --enable-libx264 --enable-libfaac --enable-encoder=libx264 --enable-encoder=mpeg2video --enable-encoder=libfaac \
|
|
--disable-muxers --enable-muxer=flv --enable-muxer=mov --enable-muxer=ipod --enable-muxer=mpegts --enable-muxer=psp --enable-muxer=mp4 --enable-muxer=avi \
|
|
--disable-decoders --enable-decoder=aac --enable-decoder=mpeg2video --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4 \
|
|
--disable-demuxers --enable-demuxer=flv --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpegts --enable-demuxer=mpc --enable-demuxer=mov \
|
|
--disable-parsers --enable-parser=aac --enable-parser=ac3 --enable-parser=h264 \
|
|
--disable-protocols --enable-protocol=file --enable-protocol=rtmp --enable-protocol=rtp --enable-protocol=udp \
|
|
--enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb \
|
|
--disable-devices --disable-debug --disable-ffmpeg --disable-ffprobe --disable-ffplay --disable-ffserver --disable-debug
|
|
|
|
make
|
|
make install
|
|
cd ..
|
|
```
|
|
|
|
(8) 打包类库
|
|
这一步用于将上述步骤中生成的5个版本的FFmpeg打包生成fat版本的FFmpeg类库。这一步骤执行完毕后，将thin-ffmpeg中几个thin版本的类库合并为一个fat版本的类库，并存储于fat-ffmpeg文件夹中。脚本如下所示。
|
|
|
|
build_ffmpeg_fat.sh
|
|
|
|
```
|
|
#!/bin/sh
|
|
|
|
|
|
# directories
|
|
THIN=`pwd`/"thin-ffmpeg"
|
|
FAT=`pwd`/"fat-ffmpeg"
|
|
CWD=`pwd`
|
|
# must be an absolute path
|
|
|
|
|
|
ARCHS="armv7s i386 armv7 arm64 x86_64"
|
|
|
|
|
|
echo "building fat binaries..."
|
|
|
|
mkdir -p $FAT/lib
|
|
set - $ARCHS
|
|
cd thin-ffmpeg/$1/lib
|
|
for LIB in *.a
|
|
do
|
|
cd $CWD
|
|
lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB
|
|
done
|
|
|
|
cd $CWD
|
|
cp -rf $THIN/$1/include $FAT
|
|
```
|
|
|
|
生成完fat版本的类库后，可以在命令行使用lipo命令查看类库的架构，如下所示。
|
|
|
|
```
|
|
lipo -info libavcodec.a
|
|
```
|
|
|
|
2. 编写IOS程序
|
|
编写包含FFmpeg类库支持的IOS程序分成两步：配置Xcode环境，编写C语言代码。
|
|
|
|
(1) 配置Xcode环境
|
|
下面以Xcode的IOS中的Single View Application为例，记录一下配置步骤：
|
|
|
|
(a) 拷贝头文件所在的include文件夹和fat版本的FFmpeg类库（包括libavformat.a， libavcodec.a， libavutil.a， libavdevice.a， libavfilter.a， libpostproc.a， libswresample.a， libswscale.a；以及第三方fat版本类库libx264.a， libfaac.a）至项目文件夹。并将它们添加至项目中。
|
|
|
|
(b) 项目属性->Build Settings中配置以下3个选项。
|
|
Linking->Other Linker Flags中添加下面内容：
|
|
|
|
```
|
|
-lavformat
|
|
-lavcodec
|
|
-lavutil
|
|
-lavdevice
|
|
-lavfilter
|
|
-lpostproc
|
|
-lswresample
|
|
-lswscale
|
|
-lx264
|
|
-lfaac
|
|
```
|
|
|
|
Search Paths->Header Search Paths添加下面内容
|
|
|
|
```
|
|
$(PROJECT_DIR)/include
|
|
```
|
|
|
|
Search Paths->Library Search Paths添加下面内容
|
|
|
|
```
|
|
$(PROJECT_DIR)
|
|
```
|
|
|
|
其它的一些配置。这些配置随着FFmpeg版本的不同而有略微的不同（在某些情况下也可能不需要配置）。我目前使用的2.7.1版本的FFmpeg需要配置下面的选项。
|
|
项目属性->General->Linked Frameworks and Libraries中添加两个类库：AVFoundation.framework和libz.dylib。
|
|
(2) 编写C语言代码
|
|
做好上面配置后，就可以在项目中编写代码测试一下FFmpeg是否正确配置了。由于IOS使用的Objective-C是兼容C语言的，所以可以直接写C语言代码调用FFmpeg。可以在ViewController.m中的viewDidLoad()函数中添加一行printf()代码打印FFmpeg类库的版本信息，如下所示。
|
|
|
|
```
|
|
#import "ViewController.h"
|
|
#include <libavcodec/avcodec.h>
|
|
|
|
@interface ViewController ()
|
|
|
|
@end
|
|
|
|
@implementation ViewController
|
|
|
|
- (void)viewDidLoad {
|
|
[super viewDidLoad];
|
|
// Do any additional setup after loading the view, typically from a nib.
|
|
printf("%s",avcodec_configuration());
|
|
}
|
|
|
|
- (void)didReceiveMemoryWarning {
|
|
[super didReceiveMemoryWarning];
|
|
// Dispose of any resources that can be recreated.
|
|
}
|
|
|
|
@end
|
|
```
|
|
|
|
如果类库编译无误，启动IOS程序的时候会在控制台打印版本信息。
|
|
|
|
## 2、源代码
|
|
|
|
项目的目录结构如图所示。
|
|
|
|
|
|
|
|
C代码位于ViewController.m文件中，内容如下所示。
|
|
|
|
```
|
|
/**
|
|
* 最简单的基于FFmpeg的HelloWorld程序 － IOS
|
|
* Simplest FFmpeg Helloworld － IOS
|
|
*
|
|
* 雷霄骅 Lei Xiaohua
|
|
* leixiaohua1020@126.com
|
|
* 中国传媒大学/数字电视技术
|
|
* Communication University of China / Digital TV Technology
|
|
* http://blog.csdn.net/leixiaohua1020
|
|
*
|
|
* 本程序可以获得FFmpeg类库相关的信息。
|
|
* This software can get information about FFmpeg libraries.
|
|
*
|
|
*/
|
|
|
|
#import "ViewController.h"
|
|
#include <libavcodec/avcodec.h>
|
|
#include <libavformat/avformat.h>
|
|
#include <libavfilter/avfilter.h>
|
|
|
|
@interface ViewController ()
|
|
|
|
@end
|
|
|
|
@implementation ViewController
|
|
|
|
- (void)viewDidLoad {
|
|
[super viewDidLoad];
|
|
// Do any additional setup after loading the view, typically from a nib.
|
|
|
|
av_register_all();
|
|
char info[10000] = { 0 };
|
|
printf("%s\n", avcodec_configuration());
|
|
sprintf(info, "%s\n", avcodec_configuration());
|
|
NSString * info_ns = [NSString stringWithFormat:@"%s", info];
|
|
self.content.text=info_ns;
|
|
}
|
|
|
|
|
|
- (void)didReceiveMemoryWarning {
|
|
[super didReceiveMemoryWarning];
|
|
// Dispose of any resources that can be recreated.
|
|
}
|
|
|
|
- (IBAction)clickProtocolButton:(id)sender {
|
|
//Alert
|
|
/*
|
|
UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"Title" message:@"This is content" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
|
|
[alter show];
|
|
*/
|
|
char info[40000]={0};
|
|
av_register_all();
|
|
|
|
struct URLProtocol *pup = NULL;
|
|
//Input
|
|
struct URLProtocol **p_temp = &pup;
|
|
avio_enum_protocols((void **)p_temp, 0);
|
|
while ((*p_temp) != NULL){
|
|
sprintf(info, "%s[In ][%10s]\n", info, avio_enum_protocols((void **)p_temp, 0));
|
|
}
|
|
pup = NULL;
|
|
//Output
|
|
avio_enum_protocols((void **)p_temp, 1);
|
|
while ((*p_temp) != NULL){
|
|
sprintf(info, "%s[Out][%10s]\n", info, avio_enum_protocols((void **)p_temp, 1));
|
|
}
|
|
//printf("%s", info);
|
|
NSString * info_ns = [NSString stringWithFormat:@"%s", info];
|
|
self.content.text=info_ns;
|
|
}
|
|
|
|
- (IBAction)clickAVFormatButton:(id)sender {
|
|
char info[40000] = { 0 };
|
|
|
|
av_register_all();
|
|
|
|
AVInputFormat *if_temp = av_iformat_next(NULL);
|
|
AVOutputFormat *of_temp = av_oformat_next(NULL);
|
|
//Input
|
|
while(if_temp!=NULL){
|
|
sprintf(info, "%s[In ]%10s\n", info, if_temp->name);
|
|
if_temp=if_temp->next;
|
|
}
|
|
//Output
|
|
while (of_temp != NULL){
|
|
sprintf(info, "%s[Out]%10s\n", info, of_temp->name);
|
|
of_temp = of_temp->next;
|
|
}
|
|
//printf("%s", info);
|
|
NSString * info_ns = [NSString stringWithFormat:@"%s", info];
|
|
self.content.text=info_ns;
|
|
}
|
|
|
|
|
|
- (IBAction)clickAVCodecButton:(id)sender {
|
|
|
|
char info[40000] = { 0 };
|
|
|
|
av_register_all();
|
|
|
|
AVCodec *c_temp = av_codec_next(NULL);
|
|
|
|
while(c_temp!=NULL){
|
|
if (c_temp->decode!=NULL){
|
|
sprintf(info, "%s[Dec]", info);
|
|
}
|
|
else{
|
|
sprintf(info, "%s[Enc]", info);
|
|
}
|
|
switch (c_temp->type){
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
sprintf(info, "%s[Video]", info);
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
sprintf(info, "%s[Audio]", info);
|
|
break;
|
|
default:
|
|
sprintf(info, "%s[Other]", info);
|
|
break;
|
|
}
|
|
sprintf(info, "%s%10s\n", info, c_temp->name);
|
|
|
|
|
|
c_temp=c_temp->next;
|
|
}
|
|
//printf("%s", info);
|
|
NSString * info_ns = [NSString stringWithFormat:@"%s", info];
|
|
self.content.text=info_ns;
|
|
}
|
|
|
|
- (IBAction)clickAVFilterButton:(id)sender {
|
|
char info[40000] = { 0 };
|
|
avfilter_register_all();
|
|
AVFilter *f_temp = (AVFilter *)avfilter_next(NULL);
|
|
while (f_temp != NULL){
|
|
sprintf(info, "%s[%10s]\n", info, f_temp->name);
|
|
}
|
|
//printf("%s", info);
|
|
NSString * info_ns = [NSString stringWithFormat:@"%s", info];
|
|
self.content.text=info_ns;
|
|
}
|
|
|
|
- (IBAction)clickConfigurationButton:(id)sender {
|
|
char info[10000] = { 0 };
|
|
av_register_all();
|
|
|
|
sprintf(info, "%s\n", avcodec_configuration());
|
|
|
|
//printf("%s", info);
|
|
//self.content.text=@"Lei Xiaohua";
|
|
NSString * info_ns = [NSString stringWithFormat:@"%s", info];
|
|
self.content.text=info_ns;
|
|
}
|
|
|
|
|
|
@end
|
|
```
|
|
|
|
## 3、运行结果
|
|
|
|
App在手机上运行后的结果如下图所示。
|
|
|
|
|
|
|
|
单击不同的按钮，可以得到类库不同方面的信息。单击“Protocol”按钮内容如下所示。
|
|
|
|
|
|
|
|
单击“AVFormat”按钮内容如下所示。
|
|
|
|
|
|
|
|
单击“AVCodec”按钮内容如下所示。
|
|
|
|
|
|
|
|
单击“Configure”按钮即为程序开始运行时候的内容。
|
|
|
|
## 4、下载
|
|
|
|
**simplest ffmpeg mobile**
|
|
|
|
**项目主页**
|
|
|
|
Github：https://github.com/leixiaohua1020/simplest_ffmpeg_mobile
|
|
|
|
开源中国：https://git.oschina.net/leixiaohua1020/simplest_ffmpeg_mobile
|
|
|
|
SourceForge：https://sourceforge.net/projects/simplestffmpegmobile/
|
|
|
|
|
|
|
|
CSDN工程下载地址： http://download.csdn.net/detail/leixiaohua1020/8924391
|
|
|
|
本解决方案包含了使用FFmpeg在移动端处理多媒体的各种例子：
|
|
|
|
> [Android]
|
|
> simplest_android_player: 基于安卓接口的视频播放器
|
|
> simplest_ffmpeg_android_helloworld: 安卓平台下基于FFmpeg的HelloWorld程序
|
|
> simplest_ffmpeg_android_decoder: 安卓平台下最简单的基于FFmpeg的视频解码器
|
|
> simplest_ffmpeg_android_decoder_onelib: 安卓平台下最简单的基于FFmpeg的视频解码器-单库版
|
|
> simplest_ffmpeg_android_streamer: 安卓平台下最简单的基于FFmpeg的推流器
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> simplest_ffmpeg_android_transcoder: 安卓平台下移植的FFmpeg命令行工具
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> simplest_sdl_android_helloworld: 移植SDL到安卓平台的最简单程序
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> [IOS]
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> simplest_ios_player: 基于IOS接口的视频播放器
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> simplest_ffmpeg_ios_helloworld: IOS平台下基于FFmpeg的HelloWorld程序
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> simplest_ffmpeg_ios_decoder: IOS平台下最简单的基于FFmpeg的视频解码器
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> simplest_ffmpeg_ios_streamer: IOS平台下最简单的基于FFmpeg的推流器
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> simplest_ffmpeg_ios_transcoder: IOS平台下移植的ffmpeg.c命令行工具
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> simplest_sdl_ios_helloworld: 移植SDL到IOS平台的最简单程序
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原文链接：https://blog.csdn.net/leixiaohua1020/article/details/47071547 |