wav和amr互转

苹果录音的格式为wav, 该格式文件体积较大(10秒100k左右), 为了缩小体积同时兼顾安卓, 可以将其转换成amr格式(能将100k缩小至10k左右, 安卓能播放amr格式, 苹果于ios4.3以后便不支持amr)

本文通过opencore-arm(下载最新库文件)将wav转换为amr

opencore-amr下载后

1.首先新建一个文件夹，将下载到的opencore-amr-0.1.5.tar.gz压缩包放到里面，然后进入这个文件夹，在里面创建build.sh文件(xcode中创建也可以),将以下脚本粘贴到文件里面

复制这段脚本时注意每行代码的后面不要有空格, 该段代码摘自大神大招致胜的博客, 由于第二个configure中没有 --host=arm-apple-darwin \ 导致编译不成功(本文已加)

#!/bin/sh  
  
set -xe  
  
VERSION="0.1.5"  
SDKVERSION="10.3"  
LIBSRCNAME="opencore-amr"  
  
CURRENTPATH=`pwd`  
  
mkdir -p "${CURRENTPATH}/src"  
tar zxvf ${LIBSRCNAME}-${VERSION}.tar.gz -C "${CURRENTPATH}/src"  
cd "${CURRENTPATH}/src/${LIBSRCNAME}-${VERSION}"  
  
DEVELOPER=`xcode-select -print-path`  
DEST="${CURRENTPATH}/lib-ios"  
mkdir -p "${DEST}"  
  
ARCHS="armv7 armv7s arm64 i386 x86_64"  
# ARCHS="armv7"  
LIBS="libopencore-amrnb.a libopencore-amrwb.a"  
  
DEVELOPER=`xcode-select -print-path`  
  
for arch in $ARCHS; do  
case $arch in  
arm*)  
  
IOSV="-miphoneos-version-min=7.0"  
if [ $arch == "arm64" ]  
then  
IOSV="-miphoneos-version-min=7.0"  
fi  
  
echo "Building for iOS $arch ****************"  
SDKROOT="$(xcrun --sdk iphoneos --show-sdk-path)"  
CC="$(xcrun --sdk iphoneos -f clang)"  
CXX="$(xcrun --sdk iphoneos -f clang++)"  
CPP="$(xcrun -sdk iphonesimulator -f clang++)"  
CFLAGS="-isysroot $SDKROOT -arch $arch $IOSV -isystem $SDKROOT/usr/include -fembed-bitcode"  
CXXFLAGS=$CFLAGS  
CPPFLAGS=$CFLAGS  
export CC CXX CFLAGS CXXFLAGS CPPFLAGS  
  
./configure \  
--host=arm-apple-darwin \
--prefix=$DEST \  
--disable-shared --enable-static  
;;  
*)  
IOSV="-mios-simulator-version-min=7.0"  
echo "Building for iOS $arch*****************"  
  
SDKROOT=`xcodebuild -version -sdk iphonesimulator Path`  
CC="$(xcrun -sdk iphoneos -f clang)"  
CXX="$(xcrun -sdk iphonesimulator -f clang++)"  
CPP="$(xcrun -sdk iphonesimulator -f clang++)"  
CFLAGS="-isysroot $SDKROOT -arch $arch $IOSV -isystem $SDKROOT/usr/include -fembed-bitcode"  
CXXFLAGS=$CFLAGS  
CPPFLAGS=$CFLAGS  
export CC CXX CFLAGS CXXFLAGS CPPFLAGS  
./configure \  
--host=arm-apple-darwin \  
--prefix=$DEST \  
--disable-shared  
;;  
esac  
make > /dev/null  
make install  
make clean  
for i in $LIBS; do  
mv $DEST/lib/$i $DEST/lib/$i.$arch  
done  
done  
  
for i in $LIBS; do  
input=""  
for arch in $ARCHS; do  
input="$input $DEST/lib/$i.$arch"  
done  
lipo -create -output $DEST/lib/$i $input  
done

2.修改build.sh的权限，打开终端，cd到新建的文件夹，使用命令 chmod  777 build.sh 修改权限.

3.修改完成之后在终端执行 ./build.sh 完成后如图

头文件

.a库(使用libopencore-amrnb.a, libopencore-amrwb.a)

demo(包括.sh文件, 已编译好的库, 转换代码)

参考博客: 

https://my.oschina.net/jeans/blog/69937

http://blog.csdn.net/devday/article/details/49357289

http://www.jianshu.com/p/f70a371c978d

简书博客地址 

https://www.jianshu.com/u/3c7c13f3dc6b