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移植Mplayer到arm

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MPlayer的简单移植
 
按照移植规范,libmad在libs目录下,MPlayer本身在项目目录下.
 
libmad的移植
CC=arm-linux-gcc ./configure  --prefix=$PWD/../../output/arm_linux  --enable-fpm=arm --host=arm-linux  --disable-debugging  --enable-shared --enable-static
 
修改Makefile 去掉129行 -fforce-mem标志,因为arm-eabi编译器都不支持这个选项,否则将会报错
cc1: error: unrecognized command line option "-fforce-mem"
   make[2]: *** [version.lo] Error 1
   make[2]: Leaving directory `/arm/madplay/libs/libmad-0.15.1b''
   make[1]: *** [all-recursive] Error 1
   make[1]: Leaving directory `/arm/madplay/libs/libmad-0.15.1b''
   make: *** [all] Error 2
 
 
make
make install
 
MPlayer 的移植
0.下载
MPlayer v1.0rc2
http://www1.mplayerhq.hu/MPlayer/releases/MPlayer-1.0rc2.tar.bz2
 
编译环境:
   在arm-linux-gcc 3.3.2 +ARM-Linux 2.6.13.
    arm-linux-gcc 4.3.2 + ARM-Linux 2.6.29
   arm-linux-gcc 4.3.3 + ARM-Linux 2.6.30 均测试通过.
 
1.生成Makefile
 

./configure --prefix=$PWD/../../output/arm_linux --cc=arm-linux-gcc --ar=arm-linux-ar \ --ranlib=arm-linux-ranlib --disable-gui   \

--target=arm-armv4-linux --target=arm-linux --disable-freetype \ --enable-fbdev --enable-network --enable-live--disable-mencoder --disable-sdl --disable-dvdread \ --disable-libdvdcss-internal --disable-x11--enable-cross-compile --disable-mp3lib --enable-mad \

--with-extraincdir="$PWD/../../output/arm_linux/include/ :$PWD/../../../usr/include/ :$PWD/../../o

utput/arm_linux/arm/sys-include/  "  \

--with-extralibdir="$PWD/../../output/arm_linux/lib/ :$PWD/../../output/arm_linux/arm/lib/ " --with-extralibdir="$PWD/../../output/arm_linux/live " \

--disable-dvdnav  --disable-dvdread-internal --disable-jpeg --disable-tga \

--disable-dvbhead --disable-pnm --disable-tv --disable-ivtv \

--disable-fontconfig --disable-xanim --disable-win32dll --disable-armv5te --disable-armv6

 

移植注意.
 
MPlayer不支持常见的--host来修改编译工具前缀.必须用--cc,--ar,--ranlib这样参数来修改.而且交叉编译 --enable-cross-compile 是必须的.
--disable-gui   关闭图形界面,只采用字符界面控制
--disable-mp3lib是关闭默认的MP3解码库,--enable-mad 是使用libmad支持.
--disable-dvbhead --disable-dvdread --disable-dvdnav  --disable-dvdread-internal 都是跟DVD相关库,基本版可以不用安装.
--disable-x11 --enable-fbdev  关闭X11视频输出,打开framebuffer支持.ARM开发板必须的.
--enable-static 如果使用静态编译尺寸大约是8M,动态编译是6M多,这样可能是无论哪种编译方式,mplayer都把自带的解码库链接到自身,多出2M应该是系统标准库的尺寸。
2.编译:
    如果有编译错误,修改源码
在某一些编译器下,会提示找不到intptr_t定义,如果是这样 libavcodec/bitstream.h:181行 ,加入如下语句.
#if defined(ARCH_ARMV4L)
typedef int32_t intptr_t ; /* Add by Andrew Huang*/
#endif
 

否则会产生如下编译错误,intptr_t在标准C中有定义,但在这里死活找不到,因此直接定义:
arm-linux-gcc -I../libswscale -I../libavcodec  -DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_ISOC9X_SOURCE -I.. -I.. -I../libavutil -Wdisabled-optimization -Wno-pointer-sign -Wdeclaration-after-statement -I. -I.. -I../libavutil -Wall -Wno-switch -Wpointer-arith -Wredundant-decls -O4   -pipe -ffast-math -fomit-frame-pointer -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DHAVE_CONFIG_H -I/usr/X11R6/include   -c -o cyuv.o cyuv.c
    cc1: warning: include location "/usr/X11R6/include" is unsafe for cross-compilation
In file included from mpegvideo.h:32,
                 from cyuv.c:38:
bitstream.h: In function ''put_bits'':
bitstream.h:233: error: ''intptr_t'' undeclared (first use in this function)
bitstream.h:233: error: (Each undeclared identifier is reported only once
bitstream.h:233: error: for each function it appears in.)
bitstream.h:233: error: expected '')'' before ''s''
bitstream.h: In function ''init_get_bits'':
bitstream.h:777: error: ''intptr_t'' undeclared (first use in this function)
bitstream.h:777: error: expected '')'' before ''buffer''
bitstream.h:778: error: expected '')'' before ''buffer''
make[1]: *** [cyuv.o] Error 1

去掉ARM pld指令的支持
 修改源码 libavcodec\armv4l\dsputil_arm_s.S, libmpeg2\motion_comp_arm_s.S
在其开始的加入,这段代码意思是定义一个空的ARM汇编宏 pld,这样当代码出现pld指令,就变成一条空指令
#ifndef HAVE_PLD
.macro pld reg
.endm
#endif
 
pld指令只在armv5te以上版本有效,在2440(armv4l)无效.必须取消掉,这个指令的格式是
预读取PLD指令
功能:cache预读取(PLD,PreLoad),使用PLD指示存储系统从后面几条指令所指定的存储器地址读取,存储系统可使用这种方法加速以后的存储器访问。
格式:
PLD[Rn,{offset}]
其中:
Rn         存储器的基址寄存器。
Offset     加在Rn上的偏移量。含义同3。2。3节第1条指令。
 

如果不取消,将会产生如下错误
arm-linux-gcc -I../libswscale -I../libavcodec  -DHAVE_AV_CONFIG_H -D_FILE_OFFSET                                              _BITS=64 -D_LARGEFILE_SOURCE -D_ISOC9X_SOURCE -I.. -I.. -I../libavutil -Wdisable                                              d-optimization -Wno-pointer-sign -Wdeclaration-after-statement -I. -I.. -I../lib                                              avutil -Wall -Wno-switch -Wpointer-arith -Wredundant-decls -O4   -pipe -ffast-ma                                              th -fomit-frame-pointer -D_REENTRANT -DHAVE_CONFIG_H -I/home/workspace/MPlayer/M                                              Player-1.0rc2/../output/linux_arm/include -I/usr/X11R6/include  -c -o armv4l/dsp                                              util_arm_s.o armv4l/dsputil_arm_s.S
cc1: warning: include location "/usr/X11R6/include" is unsafe for cross-compilat                                              ion
armv4l/dsputil_arm_s.S: Assembler messages:
armv4l/dsputil_arm_s.S:79: Error: selected processor does not support `pld [r1]''
armv4l/dsputil_arm_s.S:90: Error: selected processor does not support `pld [r1]''
armv4l/dsputil_arm_s.S:100: Error: selected processor does not support `pld [r1]                                              ''
armv4l/dsputil_arm_s.S:111: Error: selected processor does not support `pld [r1]                                              ''
armv4l/dsputil_arm_s.S:122: Error: selected processor does not support `pld [r1]                                              ''
armv4l/dsputil_arm_s.S:141: Error: selected processor does not support `pld [r1] 

      make
修改make install的bug
执行make install时会提示
install -m 755 -s mplayer /home/hxy/MPlayer/
MPlayer-1.0rc2/../output/arm_linux/bin
strip: Unable to recognise the format of the input file
`/home/hxy/MPlayer/MPlayer-1.0rc2/../output/arm_linux/bin/mplayer'

查资料看install带-s 参数时会自动调用strip来strip应用程序。但是arm编译时要调用arm-linux-strip才有正确处理。解决办法是取消-s参数,查看Makefile可以发现-s是如下
$(INSTALL) -m 755 $(INSTALLSTRIP) mplayer$(EXESUF)     $(BINDIR)
的INSTALLSTRIP设置的,它默认是-s,因此只要简单在Makefile的前面(95行)加入
INSTALLSTRIP :=  #将其置为空即可惟

4.执行:
  export LD_LIBRARY_PATH=${LIB};./mplayer  -ac mad  demo.mpg
 其中$LIB是保存有Mplayer所需的库的路径 -ac mad 是必须,表示强制用libmad解码.
这是我的成功执行一段脚本:
export APP_ROOT=/mnt/nfs/MPlayer/output/arm_linux
export LD_LIBRARY_PATH=$APP_ROOT,OOT/lib;./mplayer -ac mad 2.mpg
 

测试mpg,avi,mp3,mp4均可播放,默认是按视频的原始分辨率播放的。如果想让MPlayer完整在LCD上显示,可以用video filter 参数 scale来设置
./mplayer -vf scale=240:320
另外有人测试发现在有一些开发板下.Mplayer播放后,输出会干扰后续shell的执行行.用下面比较长的参数一般没事
export APP_ROOT=/mnt/nfs/MPlayer/output/arm_linux
export LD_LIBRARY_PATH=$APP_ROOT,OOT/lib;./mplayer -ac mad 2.mpg -quiet \
 -vf scale=320:240 2>&1 1>/dev/null &&
 

如果搞不清自己分辩率的,可在MPlayer用 -fullscreen参数 .或者执行busybox shell命令fbset查看自n己板的分辩率
 
 
本文修改自蓝点IT