Android NDK& FFMPEG构建

时间:2012-06-05 12:10:59

标签: android android-ndk ffmpeg

我正在尝试使用NDK为我的Android应用程序构建FFMPEG库。我已经从它的网站上下载了源代码,我想我是在构建它(这是我第一次尝试使用NDK和ffmpeg)。我创建了一个build.sh文件,我用它来从Mac OS X上的命令行执行它。但是我有一些问题......

首先,我知道我需要Android.mk文件,所以我可以在我的应用程序中使用构建的库,但我不知道如何做到这一点,原因我上面告诉你。在我运行build.sh之后,我获得了android文件夹,其中包含一些文件夹和一些库。所以我的第一个问题是,如何构建我需要的Android.mk文件......也许有人可以解释我为什么需要它。

enter image description here

我的第二个问题是我需要来自ffmpeg的一些库才能在我的应用程序中使用它们,但是在构建之后我无法在源代码树中看到它们。我知道我必须在我build.sh中启用它们,我想我做到了,但我看不到它们。因此,有关我的构建文件的任何类型的信息将有助于我了解如何配置它。 这是它的样子:

    #!/bin/bash
######################################################
# Usage:
# put this script in top of FFmpeg source tree
# ./build_android
# It generates binary for following architectures:
# ARMv6 
# ARMv6+VFP 
# ARMv7+VFPv3-d16 (Tegra2) 
# ARMv7+Neon (Cortex-A8)
# Customizing:
# 1. Feel free to change ./configure parameters for more features
# 2. To adapt other ARM variants
# set $CPU and $OPTIMIZE_CFLAGS 
# call build_one
######################################################
NDK=~/Desktop/android-ndk-r5b
PLATFORM=$NDK/platforms/android-8/arch-arm/
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86
function build_one
{
./configure \
    --target-os=darwin \
    --prefix=$PREFIX \
    --enable-cross-compile \
    --extra-libs="-lgcc" \
    --arch=arm \
    --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
    --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
    --sysroot=$PLATFORM \
    --extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
    --disable-doc \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-ffserver \
    --disable-ffprobe \
    --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
    --enable-zlib \
    --enable-version3 \
    --enable-nonfree \
    --enable-libmp3lame \
    --enable-libspeex \
    --enable-libtheora \
    --enable-libfaac \
    --enable-libvorbis \
    --enable-libaacplus \
    --prefix=$DIST_DIR \
    $ADDITIONAL_CONFIGURE_FLAG

make clean
make  -j4 install
$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
}

#arm v6
#CPU=armv6
#OPTIMIZE_CFLAGS="-marm -march=$CPU"
#PREFIX=./android/$CPU 
#ADDITIONAL_CONFIGURE_FLAG=
#build_one

#arm v7vfpv3
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
build_one

#arm v7vfp
#CPU=armv7-a
#OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
#PREFIX=./android/$CPU-vfp
#ADDITIONAL_CONFIGURE_FLAG=
#build_one

#arm v7n
#CPU=armv7-a
#OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
#PREFIX=./android/$CPU 
#ADDITIONAL_CONFIGURE_FLAG=--enable-neon
#build_one

#arm v6+vfp
#CPU=armv6
#OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU"
#PREFIX=./android/${CPU}_vfp 
#ADDITIONAL_CONFIGURE_FLAG=
#build_one

感谢您提供任何有用的信息/建议/示例等。

5 个答案:

答案 0 :(得分:10)

我制作了一个关于如何为ffmpeg构建x264android的教程: zip with build of ffmpeg with x264

您还可以在android下载包含您申请所需文件的zip文件。

答案 1 :(得分:9)

如果您想了解如何构建ffmpeg以及如何使用它来构建Android应用程序的更详细说明,请参阅Android NDK手册:http://www.packtpub.com/android-native-development-kit-cookbook/book

奖金第1章致力于使用Android NDK和ffmpeg进行多媒体应用程序开发,并且可以http://www.packtpub.com/sites/default/files/downloads/Developing_Multimedia_Applications_with_NDK.pdf免费获取

答案 2 :(得分:5)

首先,您应该阅读Android NDK的文档并查看一些示例应用程序。你会在android_NDK_home / docs和android_NDK_home / samples中找到这些细节(其中android_NDK_home是你的android NDK的文件夹名称)。

另外,在stackoverflow上检查此链接: Using FFmpeg with Android-NDK

对于一步一步的教程,这是一个非常好的: http://www.roman10.net/how-to-build-ffmpeg-for-android/

此外,您必须在Eclipse上安装/配置一些元素,以支持开发使用NDK构建的应用程序: http://mhandroid.wordpress.com/2011/01/23/using-eclipse-for-android-cc-development/ http://wiki.eclipse.org/Sequoyah/ndk_checklist

使用ffmpeg库的一个非常好的项目: https://github.com/havlenapetr/FFMpeg

答案 3 :(得分:1)

ffmpeg使用autoconf作为其构建系统。截至撰写本文时,还没有人在Android上为ffmpeg组建Gradle构建包。据我所知,Gradle还不支持autoconf,这很难做到这一点

也就是说,在尝试了几个教程以及一些预构建的软件包之后,我们决定为ffmpeg推出自己的Android构建脚本包装器,其中包括对OpenSSL的支持和librtmp

您可以在此处找到它:https://github.com/cine-io/android-ffmpeg-with-rtmp

先决条件:必须安装Android NDK

<强>说明:

$ git clone git@github.com:cine-io/android-ffmpeg-with-rtmp.git
$ cd android-ffmpeg-with-rtmp
$ ./build.sh

脚本完成后,所需的共享库和ffmpeg可执行文件将放入build/dist目录。您可以像在任何其他本机二进制文件中一样将它们包含在项目中。

答案 4 :(得分:0)

要构建ffmpeg可执行文件,我使用以下 Android.mk

SYSROOT-armeabi-v7a      := $(NDK_ROOT)/platforms/android-9/arch-arm/
SYSROOT-arm64-v8a := $(NDK_ROOT)/platforms/android-21/arch-arm64/
SYSROOT-x86      := $(NDK_ROOT)/platforms/android-9/arch-x86/
SYSROOT := $(SYSROOT-$(TARGET_ARCH_ABI))

TOOLCHAIN_TARGET_ARCH-armeabi-v7a := arm
TOOLCHAIN_TARGET_ARCH-arm64-v8a := aarch64
TOOLCHAIN_TARGET_ARCH-x86 := i686
TOOLCHAIN_TARGET_ARCH := $(TOOLCHAIN_TARGET_ARCH-$(TARGET_ARCH_ABI))

TOOLCHAIN_TARGET_ABI-armeabi-v7a := androideabi
TOOLCHAIN_TARGET_ABI-arm64-v8a := android
TOOLCHAIN_TARGET_ABI-x86 := android
TOOLCHAIN_TARGET_ABI := $(TOOLCHAIN_TARGET_ABI-$(TARGET_ARCH_ABI))

TOOLCHAIN_TRIPLET := $(TOOLCHAIN_TARGET_ARCH)-linux-$(TOOLCHAIN_TARGET_ABI)-

TOOLCHAIN_NAME-$(TARGET_ARCH_ABI) := $(TOOLCHAIN_TRIPLET)$(TOOLCHAIN_VERSION)
TOOLCHAIN_NAME-x86 := x86-$(TOOLCHAIN_VERSION)
TOOLCHAIN_NAME := $(TOOLCHAIN_NAME-$(TARGET_ARCH_ABI))

TOOLCHAIN_VERSION_PREFIX := $(TOOLCHAIN_TRIPLET)$(TOOLCHAIN_VERSION)

ARCH_ARM_MODE-armeabi := arm
ARCH_ARM_MODE-armeabi-v7a := thumb
ARCH_ARM_MODE-arm64-v8a := thumb
ARCH_ARM_MODE := $(ARCH_ARM_MODE-$(TARGET_ARCH_ABI))

include $(CLEAR_VARS)
LOCAL_ARM_MODE   := $(ARCH_ARM_MODE)

FFMPEG_PATH      := $(BUILD_DIRECTORY)/ffmpeg

LOCAL_CFLAGS-armeabi-v7a := -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp
LOCAL_CFLAGS-x86 := -m32
LOCAL_CFLAGS-arm64-v8a := -march=armv8-a+simd+fp

LOCAL_CFLAGS := $(LOCAL_CFLAGS-$(TARGET_ARCH_ABI))

LOCAL_LDFLAGS-x86 := -m32 -Wl,-eh-frame-hdr -Wl,-m,elf_i386 -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now

LOCAL_LDFLAGS := $(LOCAL_LDFLAGS-$(TARGET_ARCH_ABI))

LOCAL_CFLAGS += -fPIE
LOCAL_LDFLAGS += -fPIE -pie

FFMPEG_CONFIG_OPTS := 

FFMPEG_CONFIG_OPTS += --target-os=linux
FFMPEG_CONFIG_OPTS-$(TARGET_ARCH_ABI) := --cross-prefix=$(TOOLCHAIN_PREFIX)
FFMPEG_CONFIG_OPTS-$(TARGET_ARCH_ABI) += --enable-cross-compile
FFMPEG_CONFIG_OPTS-$(TARGET_ARCH_ABI) += --sysroot=$(SYSROOT)
FFMPEG_CONFIG_OPTS += $(FFMPEG_CONFIG_OPTS-$(TARGET_ARCH_ABI))

## disable
FFMPEG_CONFIG_OPTS += --disable-doc
FFMPEG_CONFIG_OPTS += --disable-shared
FFMPEG_CONFIG_OPTS += --disable-avdevice
FFMPEG_CONFIG_OPTS += --disable-postproc
FFMPEG_CONFIG_OPTS += --disable-network
FFMPEG_CONFIG_OPTS += --disable-iconv
FFMPEG_CONFIG_OPTS += --disable-zlib
FFMPEG_CONFIG_OPTS += --disable-ffplay
FFMPEG_CONFIG_OPTS += --disable-ffprobe
FFMPEG_CONFIG_OPTS += --disable-ffserver
FFMPEG_CONFIG_OPTS += --disable-swscale-alpha
## enable
FFMPEG_CONFIG_OPTS += --enable-pthreads
FFMPEG_CONFIG_OPTS += --enable-small

FFMPEG_CONFIG_OPTS += --extra-cflags="$(LOCAL_CFLAGS)"
FFMPEG_CONFIG_OPTS += --extra-cxxflags="$(LOCAL_CXXFLAGS)"
FFMPEG_CONFIG_OPTS += --extra-ldflags="$(LOCAL_LDFLAGS)"

FFMPEG_CONFIG_OPTS += --enable-runtime-cpudetect

ARMBITS-$(TARGET_ARCH_ABI) :=
ARMBITS-arm64-v8a := 64
ARMBITS := $(ARMBITS-$(TARGET_ARCH_ABI))

FFMPEG_CONFIG_OPTS-$(TARGET_ARCH_ABI) :=

FFMPEG_CONFIG_OPTS-armeabi := --enable-armv5te
FFMPEG_CONFIG_OPTS-armeabi += --enable-inline-asm
FFMPEG_CONFIG_OPTS-armeabi += --arch=arm$(ARMBITS)

FFMPEG_CONFIG_OPTS-armeabi-v7a := $(FFMPEG_CONFIG_OPTS-armeabi)
FFMPEG_CONFIG_OPTS-armeabi-v7a += --enable-armv6
FFMPEG_CONFIG_OPTS-armeabi-v7a += --enable-armv6t2
FFMPEG_CONFIG_OPTS-armeabi-v7a += --enable-vfp
FFMPEG_CONFIG_OPTS-armeabi-v7a += --enable-neon
FFMPEG_CONFIG_OPTS-armeabi-v7a += --enable-thumb
FFMPEG_CONFIG_OPTS-armeabi-v7a += --enable-fast-unaligned

FFMPEG_CONFIG_OPTS-arm64-v8a := $(FFMPEG_CONFIG_OPTS-armeabi-v7a)

FFMPEG_CONFIG_OPTS-x86 := --enable-yasm
FFMPEG_CONFIG_OPTS-x86 += --arch=x86

FFMPEG_CONFIG_OPTS += $(FFMPEG_CONFIG_OPTS-$(TARGET_ARCH_ABI))

LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := $(abspath $(TARGET_OBJS))/ffmpeg/lib...ffmpeg...so # see http://stackoverflow.com/a/17384650/192373

clean: $(TARGET_OBJS)/ffmpeg/clean

$(TARGET_OBJS)/ffmpeg/clean: PRIVATE_ABI := $(FFMPEG_TARGET_ABI)
$(TARGET_OBJS)/ffmpeg/clean:
    $(call host-echo-build-step,$(PRIVATE_ABI),Clean) "ffmpeg [$(PRIVATE_ABI)]"
    $(hide) $(call host-rmdir,$(@D))

$(shell $(call host-mkdir,$(dir $(LOCAL_SRC_FILES))))
$(shell $(HOST_ECHO) >$(LOCAL_SRC_FILES))
.PHONY: $(LOCAL_SRC_FILES)
$(LOCAL_SRC_FILES): $(TARGET_OBJS)/ffmpeg/ffmpeg
    $(hide) $(call host-mv,$<,$@)

include $(PREBUILT_SHARED_LIBRARY)

$(TARGET_OBJS)/ffmpeg/Makefile: FFMPEG_CONFIG_OPTS := $(FFMPEG_CONFIG_OPTS)
$(TARGET_OBJS)/ffmpeg/Makefile:
    $(hide) $(call host-mkdir,$(@D))
    $(hide) cd $(@D) && $(abspath $(FFMPEG_PATH))/configure $(FFMPEG_CONFIG_OPTS)

$(TARGET_OBJS)/ffmpeg/ffmpeg: FFMPEG_CONFIG_OPTS := using toolchain:$(NDK_ROOT)/toolchains/$(TOOLCHAIN_NAME) compiler:$(TOOLCHAIN_COMPILER) triplet:$(TOOLCHAIN_TRIPLET)
$(TARGET_OBJS)/ffmpeg/ffmpeg: $(TARGET_OBJS)/ffmpeg/Makefile
    @echo $(FFMPEG_CONFIG_OPTS)
    $(hide) $(MAKE) --no-print-directory -C $(@D)