170 lines
5.2 KiB
Markdown
170 lines
5.2 KiB
Markdown
# 基于Ubuntu源码编译ffmpeg
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## 编译SDL2（可选）
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```shell
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https://github.com/libsdl-org/SDL/releases/tag/release-2.30.8 # 下载源码
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cd sdl/source/folder
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./configure --prefix=/usr/local
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make
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sudo make install
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```
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## 安装ffmpeg依赖
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1. 安装包管理工具 aptitude
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aptitude 与 apt-get一样，是 Debian 系中功能极其强大的包管理工具。 与 apt-get 不同的是，aptitude 在处理依赖问题上更佳一些，当 aptitude 在删除一个包时，会同时删除本身所依赖的包。
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```shell
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sudo apt install aptitude
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```
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2. 安装 yasm、nasm
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yasm、nasm 是两个汇编器，编译 FFmpeg 需要用到。
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安装命令：
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```shell
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sudo aptitude install yasm nasm
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```
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3. 其他依赖
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FFmpeg 的安装依赖许多库（如，音频编码库，音频解码库，视频编解码库等），这里不介绍每个库的具体作用，按照命令安装即可。
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```shell
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sudo apt-get install libgmp3-dev
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sudo apt install pkg-config
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sudo apt install gnutls-bin
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sudo aptitude install libaom-dev
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sudo aptitude install libass-dev
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sudo aptitude install libbluray-dev
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sudo aptitude install libfdk-aac-dev
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sudo aptitude install libmp3lame-dev
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sudo aptitude install libopencore-amrnb-dev
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sudo aptitude install libopencore-amrwb-dev
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sudo aptitude install libopenmpt-dev
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sudo aptitude install libopus-dev
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sudo aptitude install libshine-dev
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sudo aptitude install libsnappy-dev
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sudo aptitude install libsoxr-dev
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sudo aptitude install libspeex-dev
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sudo aptitude install libtheora-dev
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sudo aptitude install libtwolame-dev
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sudo aptitude install libvo-amrwbenc-dev
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sudo aptitude install llibvpx-dev
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sudo aptitude install libwavpack-dev
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sudo aptitude install libwebp-dev
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sudo aptitude install libx264-dev
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sudo aptitude install libx265-dev
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sudo aptitude install libxvidcore-dev
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sudo aptitude install liblzma-dev
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```
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## 编译ffmpeg
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1. 从官网下载源码
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2. 进入根目录编译
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```shell
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./configure --enable-shared --enable-gpl --enable-sdl2 --enable-libx264 --enable-libx265 --enable-nvdec --enable-nvenc --enable-cuda --enable-cuvid
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# 其中 --enable-gpl --enable-libx264 --enable-libx265 必不可少 --enable-sdl2 是ffmpeg播放器需要的
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# 由于需要硬件英伟达显卡加速编解码 --enable-nvdec --enable-nvenc --enable-cuda --enable-cuvid
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# --enable-shared 使make install时，将动态库也正确安装，否则运行ffmpeg时，会显示缺少动态库
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make
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sudo make install
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# 安装完后，确保安装目录，确保已经配置好动态库搜索的路径，
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```
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如果需要硬件英伟达显卡加速编解码，需要安装相关依赖
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```shell
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sudo apt install libdssialsacompat-dev
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git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git
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cd nv-codec-headers
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make
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sudo make install
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```
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编译ffmeg arm64版本
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在源码目录下创建buildarm64.sh，内容如下
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```shell
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#!/bin/bash
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export NDK=~/android/android-ndk-r20b #这里配置先你的 NDK 路径
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TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64
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# 编译到安卓上，尽可能小一些(--enable-small)，只是用来解码，也就取消编译封装编码相关的
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function build_android
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{
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./configure \
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--disable-programs \
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--disable-avdevice \
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--disable-encoders \
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--disable-muxers \
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--disable-filters \
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--enable-neon \
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--enable-gpl \
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--disable-sdl2 \
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--disable-postproc \
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--disable-debug \
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--enable-small \
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--enable-static \
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--enable-shared \
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--disable-doc \
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--enable-ffmpeg \
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--disable-ffplay \
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--disable-ffprobe \
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--disable-avdevice \
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--disable-doc \
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--disable-symver \
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--prefix=$PREFIX \
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--cross-prefix=$CROSS_PREFIX \
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--target-os=android \
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--arch=$ARCH \
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--cpu=$CPU \
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--cc=$CC \
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--cxx=$CXX \
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--enable-cross-compile \
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--sysroot=$SYSROOT \
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--extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
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--extra-ldflags="$ADDI_LDFLAGS"
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make clean
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make -j16
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make install
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echo "============================ build android arm64-v8a success =========================="
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}
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#arm64-v8a
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ARCH=arm64
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CPU=armv8-a
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API=21
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CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang
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CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++
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SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
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CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
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PREFIX=$(pwd)/android/$CPU
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OPTIMIZE_CFLAGS="-march=$CPU"
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build_android
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```
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```shell
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chomd +x buildarm64.sh
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./buildarm64.sh
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# 编译好后，对应的源文件和库文件会安装到./android/armv-v8a中
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```
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## 硬编码
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```c++
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// 与软编码相比，没有很多额外的配置
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// 仅仅是在查找编码器时按名称查找 hevc_nvenc ,其余和软编码一样
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auto pCodec = avcodec_find_encoder_by_name("hevc_nvenc");
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// ...
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// 其次就是注意软编码出来的每一帧数据 前面都会带有SEI增强帧，关键帧后面才是I帧或者P帧
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auto naluHeader = (pkt->data[4] & 0x7E) >> 1; // 前四个字节是0x00 00 00 01 分隔符
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if (naluHeader == 39) { // SEI
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auto header = getNextSplit(pkt->data, pkt->size); // 往后找，跳过这个SEI
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if (header == nullptr)
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return 0;
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naluHeader = ((*header) & 0x7E) >> 1;
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// cout << "naluHeader: " << naluHeader << endl;
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}
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```
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