最新ffmpeg 移植到 android，mips

最新推荐文章于 2022-09-20 16:25:20 发布

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#ffmpeg #android

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本文详细介绍了如何从ffmpeg.org获取最新源码，编译成适用于Android的库，并通过修改开源播放器代码来实现其在Android平台上的成功移植及调试。

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1.get 最新ffmpeg源码

ffmpeg.org中

git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg

2.编译成android识别的库

配置编译脚本
config.sh

#!/bin/bash

NDK=/home/lls/4.0.4/android-ndk-20150811
SYSROOT=$NDK/platforms/android-9/arch-mips/
TOOLCHAIN=$NDK/toolchains/mipsel-linux-android-4.6/prebuilt/linux-x86
CPU=loongson
PREFIX=$(pwd)/android/$CPU
./configure \
    --prefix=$PREFIX \
    --cpu=loongson3 \
    --enable-shared \
    --disable-static \
    --disable-doc \
    --disable-asm \
    --disable-ffserver \
    --cross-prefix=$TOOLCHAIN/bin/mipsel-linux-android- \
    --cc=$TOOLCHAIN/bin/mipsel-linux-android-gcc \
    --as=$TOOLCHAIN/bin/mipsel-linux-android-as \
    --enable-cross-compile \
    --nm=$TOOLCHAIN/bin/mipsel-linux-android-nm \
    --target-os=linux \
    --extra-cflags="-fPIC -DANDROID" \
    --arch=mips \
    --sysroot=$SYSROOT \
    --extra-cflags="-Os -fpic" \

修改configure文件

diff --git a/configure b/configure
index 124b87f..3d85941 100755
--- a/configure
+++ b/configure
@@ -2929,10 +2929,15 @@ SLIBPREF="lib" 
 SLIBSUF=".so" 
 SLIBNAME='$(SLIBPREF)$(FULLNAME)$(SLIBSUF)'
 SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
-SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
-LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
-SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
-SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'
+#SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
+#LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
+#SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
+#SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'
+
+SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
+LIB_INSTALL_EXTRA_CMD='$$(RANLIB)"$(LIBDIR)/$(LIBNAME)"'
+SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
+SLIB_INSTALL_LINKS='$(SLIBNAME)'

 asflags_filter=echo

经过修改就可以编译出需要的库文件，
libavcodec-56.so libavdevice-56.so libavfilter-5.so libavformat-56.so libavutil-54.so libswresample-1.so libswscale-3.so

3.移植开源播放器
下载
https://github.com/havlenapetr/FFMpeg.git

4.修改移植过程的错误

注意加载动态库顺序，在FFMpeg.java中
"jniaudio", // used for access to android native AudioTrack class
"jnivideo",
"avutil-54",
"swresample-1",
"avcodec-56",
"avformat-56",
"swscale-3",
"avfilter-5",
"avdevice-56",
"ffmpeg_jni"

注释掉FFMpeg.java中与播放过程无关的一些函数设置，只留下av_register_all,avcodec_register_all等native接口，同样，对于jni/jni/com_media_ffmpeg_FFMpeg.c文件，也要修改，取消那些未使用的native方法的定义

（1）modify output.cpp file

Undefined reference to AndroidSurface_updateSurface(),原因如下，需要进行修改
函数在frameworks/base/native/video/jni/surface.cpp中没有参数
call the AndroidSurface_updateSurface(),without any parameter,so modify the called funtion in include/android/surface.h

（2）can not find sws_scale funtion in mediaplayer.cpp

modify the Android.mk in jni and libmediaplayer to add swscale lib load

5.调试 apk

使用adb进行调试

参考

http://blog.youkuaiyun.com/gobitan/article/details/22750719

http://blog.youkuaiyun.com/vblittleboy/article/details/21027527

http://blog.youkuaiyun.com/conowen/article/details/7526398

http://blog.youkuaiyun.com/conowen/article/details/7875080