OpenH264编译ffmpeg android

思科的

安装NASM

git clone https://github.com/cisco/openh264.git

Android Builds

install android sdk and ndk.

export PATH=**ANDROID_SDK**/tools:$PATH

make OS=android NDKROOT=**ANDROID_NDK** TARGET=**ANDROID_TARGET**

Valid **ANDROID_TARGET** can be found in **ANDROID_SDK**/platforms, such as android-12.

You can also set ARCH, NDKLEVELaccording to your device and NDK version. 

ARC:arm, arm64, x86 and x86_64

NDKLEVEL specifies android api level, the default is 12.Available possibilities can be found in **ANDROID_NDK**/platforms,

By default these commands build for the armeabi-v7a

• codec - encoder, decoder, console (test app), build (makefile, vcproj)
• build - scripts for Makefile build system
• test - GTest unittest files
• testbin - autobuild scripts, test app config files
• res - yuv and bitstream test files

# armeabi-v7a

make OS=android NDKROOT=$NDK_ROOT TARGET=android-21 ARCH=arm NDKLEVEL=21 clean

make OS=android NDKROOT=$NDK_ROOT TARGET=android-17 ARCH=arm NDKLEVEL=17

https://blog.ibaoger.com/2017/07/10/compile-openh264-for-android/index.html

NDK 从 level21 开始支持 64位架构，因此 TARGET 低于 android-21 的将无法编译 arm64、x86_64、mips64 库

 mips、mips64 两种架构未做优化处理

生成的文件位于 ~/openh264 目录下，共计5个静态库，1个动态库

libcommon.a

libdecoder.a

libencoder.a

libopenh264.a

libprocessing.a

libopenh264.so

Invalid or unsupported command "update project -t android-17 -p ."

看makefile

"cd ./test/build/android && $(NDKROOT)/ndk-build -B APP_ABI=$(APP_ABI) && android update project -t $(TARGET) -p . && ant debug"

https://github.com/cisco/openh264/issues/2994

this error caused by using a higher SDK tool to build encoder & decoder demo program. The "android" tool does not support "update project" in the higher SDK version. Actually, the openh264 libraries have been built successfully.

实际已经编译成功了

ffmpeg

./configure --list-decoders和./configure --list-encoders都有

libopenh264

--enable-libopenh264

ffmpeg中

#include <wels/codec_api.h>

#include <wels/codec_ver.h>

vim meson.build

foreach t : ['', '-static']

pkgconf = configuration_data()

pkgconf.set('prefix', join_paths(get_option('prefix')))

pkgconf.set('VERSION', meson.project_version())

if t == '-static'

do_install = false

pkgconf.set('LIBS', '-lstdc++ -lpthread -lm')

pkgconf.set('LIBS_PRIVATE', '')

else

do_install = true

pkgconf.set('LIBS', '')

pkgconf.set('LIBS_PRIVATE', '-lstdc++ -lpthread -lm')

endif

undefined reference to '__dso_handle'

make install PREFIX=/some/path

make install-static PREFIX=/root/starRTC_ffmpeg/ffmpeg_compile/build_result/armeabi-v7a-neon

undefined reference to XXX_neonerrors at the stage of FFmpeg configuring.

In the end, I set USE_ASM to no and everything was okay.

Makefile

ifeq ($(BUILDTYPE), Release)

CFLAGS += $(CFLAGS_OPT)

USE_ASM = No

else

CFLAGS += $(CFLAGS_DEBUG)

USE_ASM = No

endif

arm-linux-androideabi/bin/ld: error: cannot find -lpthread

改为 -pthread

因为android的ndk虽然有pthread.h,但是没有libpthread.a,集成到libc.a里了-lc

https://blog.csdn.net/u014006343/article/details/46545831