ffmpeg xcode 中的使用

最近比较闲,苦于ios设备上没有直接播放torrent 文件的软件,开始折腾了.找了不少资料有了思路.但是其中用到了ffmpeg 这个东西.

　　ffmpeg 是通用的一个视频解决框架,用C语言编写,通用性很强.

编译ffmpeg.

下载源码后可以自己手动编译 ,反正是通过各种命令配置configure

通过一个很牛逼的脚本:git@github.com:kewlbear/FFmpeg-iOS-build-script.git 下载之后,检查ffmpeg的版本号,替换成最新的然后运行脚本就行了

#!/bin/sh

# directories

SOURCE="ffmpeg-2.5"

FAT="FFmpeg-iOS"

SCRATCH="scratch"

# must be an absolute path

THIN=`pwd`/"thin"

# absolute path to x264 library

#X264=`pwd`/fat-x264

#FDK_AAC=`pwd`/fdk-aac/fdk-aac-ios

CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \

                 --disable-doc --enable-pic"

if [ "$X264" ]

then

	CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"

fi

if [ "$FDK_AAC" ]

then

	CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-libfdk-aac"

fi

# avresample

#CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"

ARCHS="arm64 armv7s armv7 x86_64 i386"

COMPILE="y"

LIPO="y"

DEPLOYMENT_TARGET="6.0"

if [ "$*" ]

then

	if [ "$*" = "lipo" ]

	then

		# skip compile

		COMPILE=

	else

		ARCHS="$*"

		if [ $# -eq 1 ]

		then

			# skip lipo

			LIPO=

		fi

	fi

fi

if [ "$COMPILE" ]

then

	if [ ! `which yasm` ]

	then

		echo 'Yasm not found'

		if [ ! `which brew` ]

		then

			echo 'Homebrew not found. Trying to install...'

			ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)" \

				|| exit 1

		fi

		echo 'Trying to install Yasm...'

		brew install yasm || exit 1

	fi

	if [ ! `which gas-preprocessor.pl` ]

	then

		echo 'gas-preprocessor.pl not found. Trying to install...'

		(curl -L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl \

			-o /usr/local/bin/gas-preprocessor.pl \

			&& chmod +x /usr/local/bin/gas-preprocessor.pl) \

			|| exit 1

	fi

	if [ ! -r $SOURCE ]

	then

		echo 'FFmpeg source not found. Trying to download...'

		curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj \

			|| exit 1

	fi

	CWD=`pwd`

	for ARCH in $ARCHS

	do

		echo "building $ARCH..."

		mkdir -p "$SCRATCH/$ARCH"

		cd "$SCRATCH/$ARCH"

		CFLAGS="-arch $ARCH"

		if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]

		then

		    PLATFORM="iPhoneSimulator"

		    CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"

		else

		    PLATFORM="iPhoneOS"

		    CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET"

		    if [ "$ARCH" = "arm64" ]

		    then

		        EXPORT="GASPP_FIX_XCODE5=1"

		    fi

		fi

		XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`

		CC="xcrun -sdk $XCRUN_SDK clang"

		CXXFLAGS="$CFLAGS"

		LDFLAGS="$CFLAGS"

		if [ "$X264" ]

		then

			CFLAGS="$CFLAGS -I$X264/include"

			LDFLAGS="$LDFLAGS -L$X264/lib"

		fi

		if [ "$FDK_AAC" ]

		then

			CFLAGS="$CFLAGS -I$FDK_AAC/include"

			LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"

		fi

		TMPDIR=${TMPDIR/%\/} $CWD/$SOURCE/configure \

		    --target-os=darwin \

		    --arch=$ARCH \

		    --cc="$CC" \

		    $CONFIGURE_FLAGS \

		    --extra-cflags="$CFLAGS" \

		    --extra-cxxflags="$CXXFLAGS" \

		    --extra-ldflags="$LDFLAGS" \

		    --prefix="$THIN/$ARCH" \

		|| exit 1

		make -j3 install $EXPORT || exit 1

		cd $CWD

	done

fi

if [ "$LIPO" ]

then

	echo "building fat binaries..."

	mkdir -p $FAT/lib

	set - $ARCHS

	CWD=`pwd`

	cd $THIN/$1/lib

	for LIB in *.a

	do

		cd $CWD

		echo lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB 1>&2

		lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1

	done

	cd $CWD

	cp -rf $THIN/$1/include $FAT

fi

echo Done

导入项目,有静态包经验的就就不用看了,这个对于我这个半路出家的和尚还是处理了老半天才解决.
.a文件直接导入 .h文件要导入文件夹结构配置header search 环境变量使用的时候导入文件结构:#import "文件夹/文件.h"

编译.

首次编译.

Undefined symbols for architecture armv7:

  "_deflateInit2_", referenced from:

      _encode_frame in libavcodec.a(pngenc.o)

  "_crc32", referenced from:

      _encode_frame in libavcodec.a(pngenc.o)

  "_deflateReset", referenced from:

      _encode_frame in libavcodec.a(lclenc.o)

      _encode_frame in libavcodec.a(zmbvenc.o)

  "_compress", referenced from:

      _encode_strip in libavcodec.a(tiffenc.o)

  "_deflateBound", referenced from:

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

      _encode_frame in libavcodec.a(pngenc.o)

      _encode_frame in libavcodec.a(lclenc.o)

  "_inflateSync", referenced from:

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

  "_inflateReset", referenced from:

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

      _zlib_decomp in libavcodec.a(lcldec.o)

      _decode_frame in libavcodec.a(tscc.o)

      _zerocodec_decode_frame in libavcodec.a(zerocodec.o)

      _decode_frame in libavcodec.a(zmbv.o)

  "_iconv_open", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_BZ2_bzDecompress", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

  "_inflate", referenced from:

      _http_read_stream in libavformat.a(http.o)

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

      _rtmp_open in libavformat.a(rtmpproto.o)

      _zlib_refill in libavformat.a(swfdec.o)

      _decode_frame_common in libavcodec.a(pngdec.o)

      _decode_text_chunk in libavcodec.a(pngdec.o)

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

      ...

  "_inflateInit_", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

      _rtmp_open in libavformat.a(rtmpproto.o)

      _swf_read_header in libavformat.a(swfdec.o)

      _decode_frame_apng in libavcodec.a(pngdec.o)

      _decode_frame_png in libavcodec.a(pngdec.o)

      _decode_text_chunk in libavcodec.a(pngdec.o)

      _flashsv_decode_init in libavcodec.a(flashsv.o)

      ...

  "_iconv", referenced from:

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_BZ2_bzDecompressEnd", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

  "_inflateInit2_", referenced from:

      _http_read_header in libavformat.a(http.o)

  "_deflateEnd", referenced from:

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)

      _flashsv_encode_init in libavcodec.a(flashsvenc.o)

      _flashsv_encode_end in libavcodec.a(flashsvenc.o)

      _encode_frame in libavcodec.a(pngenc.o)

      _encode_end in libavcodec.a(lclenc.o)

      _encode_init in libavcodec.a(zmbvenc.o)

      ...

  "_BZ2_bzDecompressInit", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

  "_deflateInit_", referenced from:

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)

      _encode_init in libavcodec.a(lclenc.o)

      _encode_init in libavcodec.a(zmbvenc.o)

  "_zlibCompileFlags", referenced from:

      _http_read_header in libavformat.a(http.o)

  "_compress2", referenced from:

      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)

      _flashsv_encode_frame in libavcodec.a(flashsvenc.o)

  "_deflate", referenced from:

      _flashsv_decode_frame in libavcodec.a(flashsv.o)

      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)

      _encode_frame in libavcodec.a(pngenc.o)

      _encode_frame in libavcodec.a(lclenc.o)

      _encode_frame in libavcodec.a(zmbvenc.o)

  "_inflateEnd", referenced from:

      _http_close in libavformat.a(http.o)

      _http_read_header in libavformat.a(http.o)

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

      _rtmp_open in libavformat.a(rtmpproto.o)

      _swf_read_close in libavformat.a(swfdec.o)

      _decode_frame_apng in libavcodec.a(pngdec.o)

      _decode_frame_png in libavcodec.a(pngdec.o)

      ...

  "_uncompress", referenced from:

      _id3v2_read_internal in libavformat.a(id3v2.o)

      _mov_read_cmov in libavformat.a(mov.o)

      _swf_read_packet in libavformat.a(swfdec.o)

      _decode_frame in libavcodec.a(cscd.o)

      _decode_frame in libavcodec.a(dxa.o)

      _decode_block in libavcodec.a(exr.o)

      _g2m_decode_frame in libavcodec.a(g2meet.o)

      ...

  "_iconv_close", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

ld: symbol(s) not found for architecture armv7

clang: error: linker command failed with exit code  (use -v to see invocation)

导入 libz.1.2.5.dylib ,再次编译

Undefined symbols for architecture armv7:

  "_BZ2_bzDecompressInit", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

  "_iconv", referenced from:

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_BZ2_bzDecompress", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

  "_BZ2_bzDecompressEnd", referenced from:

      _matroska_decode_buffer in libavformat.a(matroskadec.o)

  "_iconv_open", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_iconv_close", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

ld: symbol(s) not found for architecture armv7

clang: error: linker command failed with exit code  (use -v to see invocation)

导入 libbz2.1.0.dylib ,再次编译

Undefined symbols for architecture armv7:

  "_iconv", referenced from:

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_iconv_open", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_iconv_close", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

ld: symbol(s) not found for architecture armv7

clang: error: linker command failed with exit code  (use -v to see invocation)

导入 libiconv.2.4.0.dylib 编译通过 3.0 后不通过

Undefined symbols for architecture x86_64:

  "_CMBlockBufferCreateWithMemoryBlock", referenced from:

      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)

  "_CMSampleBufferCreate", referenced from:

      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)

  "_CMVideoFormatDescriptionCreate", referenced from:

      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionCreate", referenced from:

      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionDecodeFrame", referenced from:

      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionInvalidate", referenced from:

      _av_videotoolbox_default_free in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionWaitForAsynchronousFrames", referenced from:

      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)

  "_kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms", referenced from:

      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code  (use -v to see invocation)

导入 CoreMedia.framework 编译

Undefined symbols for architecture x86_64:

  "_VTDecompressionSessionCreate", referenced from:

      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionDecodeFrame", referenced from:

      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionInvalidate", referenced from:

      _av_videotoolbox_default_free in libavcodec.a(videotoolbox.o)

  "_VTDecompressionSessionWaitForAsynchronousFrames", referenced from:

      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)

ld: symbol(s) not found for architecture x86_64

导入 VideoToolbox.framework 编译通过

　　到此准备结束

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