移植ffmpeg至海思平臺

一、xvid、x264、ffmpeg源碼下載

鏈接：https://pan.baidu.com/s/13phSFrLqkGrKDGF3_a2cSA
提取碼：ls2s

二、交叉編譯

1. xvid

1. tar zxvf xvidcore-1.3.3.tar.gz
2. cd xvidcore/build/generic
3. ./configure --prefix=/home/workspace/arm_soft/ --host=arm-hisiv100nptl-linux --target=arm-linux
4. make -j 8
5. make install
   

xvidcore-1.1.3這個版本有點問題，後面編譯ffmpeg的時候會提示找不到 libxvid，但還是記錄下。

make 出現錯誤

root@chenwr-pc:/home/workspace/soft/ffmpeg/xvidcore-1.1.3/build/generic# make
  D: =build
  C: ./decoder.c
cc1: error: unrecognized command line option "-freduce-all-givs"

編輯configure 搜索freduce 這兩處屏蔽掉


make -j 8
make install

2. x264

1. tar jxvf last_x264.tar.bz2
2. cd x264-snapshot-20161225-2245
3. ./configure --prefix=/home/workspace/arm_soft --host=arm-hisiv100nptl-linux --enable-shared --disable-asm
4. 修改config.mak
   修改內容如下：
   CC=gcc 改爲 CC=arm-hisiv100nptl-linux-gcc
   LD=gcc -o 改爲 LD=arm-hisiv100nptl-linux-gcc -o
   RANLIB=ranlib 改爲 RANLIB=arm-hisiv100nptl-linux-ranlib
   STRIP=strip 改爲 STRIP=arm-hisiv100nptl-linux-strip
5. 修改common目錄下的cpu.c文件，詳情見錯誤記錄
6. make -j 8
7. make install

錯誤記錄：

make出現錯誤

libx264.a(cpu.o): In function `x264_cpu_num_processors':
cpu.c:(.text+0x44): undefined reference to `CPU_COUNT'
collect2: ld returned 1 exit status

解決辦法：
修改common目錄下的cpu.c文件，搜索關鍵字x264_cpu_num_processors，屏蔽CPU_COUNT，具體如圖所示。

編譯成功

3. ffmpeg

1. tar jxvf ffmpeg-3.0.2.tar.bz2
2. cd ffmpeg-3.0.2/
3. ./configure --prefix=/home/workspace/arm_soft/ffmpeg --disable-static --enable-shared --disable-debug --disable-asm --disable-ffplay --disable-ffprobe --disable-ffserver --enable-small --disable-doc --enable-demuxer=rtsp --enable-parser=h264 --enable-cross-compile --enable-libx264 --enable-libxvid --enable-nonfree --enable-gpl --arch=arm --target-os=linux --cross-prefix=arm-hisiv100nptl-linux- --extra-cflags=-I/home/workspace/arm_soft/include --extra-ldflags=-L/home/workspace/arm_soft/lib
4. make -j 8
5. make install

錯誤記錄：

libavcodec/libx264.c: In function 'X264_frame':
libavcodec/libx264.c:271: error: 'x264_bit_depth' undeclared (first use in this function)
libavcodec/libx264.c:271: error: (Each undeclared identifier is reported only once
libavcodec/libx264.c:271: error: for each function it appears in.)
libavcodec/libx264.c:371: warning: 'coded_frame' is deprecated (declared at libavcodec/avcodec.h:2945)
libavcodec/libx264.c:381: warning: 'coded_frame' is deprecated (declared at libavcodec/avcodec.h:2945)
libavcodec/libx264.c: In function 'X264_init':
libavcodec/libx264.c:539: warning: 'chromaoffset' is deprecated (declared at libavcodec/avcodec.h:2210)
libavcodec/libx264.c:540: warning: 'chromaoffset' is deprecated (declared at libavcodec/avcodec.h:2210)
libavcodec/libx264.c:553: warning: 'scenechange_threshold' is deprecated (declared at libavcodec/avcodec.h:2108)
libavcodec/libx264.c:554: warning: 'scenechange_threshold' is deprecated (declared at libavcodec/avcodec.h:2108)
libavcodec/libx264.c:600: warning: 'noise_reduction' is deprecated (declared at libavcodec/avcodec.h:2112)
libavcodec/libx264.c:601: warning: 'noise_reduction' is deprecated (declared at libavcodec/avcodec.h:2112)
libavcodec/libx264.c:610: warning: 'b_frame_strategy' is deprecated (declared at libavcodec/avcodec.h:1830)
libavcodec/libx264.c:611: warning: 'b_frame_strategy' is deprecated (declared at libavcodec/avcodec.h:1830)
libavcodec/libx264.c:618: warning: 'coder_type' is deprecated (declared at libavcodec/avcodec.h:2576)
libavcodec/libx264.c:619: warning: 'coder_type' is deprecated (declared at libavcodec/avcodec.h:2576)
libavcodec/libx264.c:715: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:717: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:719: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:721: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:723: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c: In function 'X264_init_static':
libavcodec/libx264.c:898: error: 'x264_bit_depth' undeclared (first use in this function)
make: *** [libavcodec/libx264.o] Error 1
make: *** Waiting for unfinished jobs....

定位到報錯的源碼位置

在我交叉編譯x264 make install成功的/home/workspace/arm_soft目錄下搜索x264_bit_depth，發現有定義，但是是大寫的。

原來是海思編譯器的問題，沒有去區分大小寫，於是在x264_config.h新增一個小寫的宏定義

編譯成功。

ffmpeg configure選項說明，轉發了一個整理很不錯的博客，參考該博客，根據自己實際需求去配置相關編解碼器就好了。

ffmpeg configure配置選項 - chenwr2018的博客 - CSDN博客

三、驗證

將ffmpeg x264 xvid 相關的include與lib拷貝到設備上。由於我沒有裁剪，並且設備根目錄空間有限，暫時拷貝到U盤，先測試下轉碼功能是否ok。

設置好環境變量：

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/mnt/udisk/ffmpeg/lib
export PATH=$PATH:/mnt/udisk/ffmpeg/include:/mnt/udisk/ffmpeg/bin

在開發板進行測試

成功壓縮視頻文件