使用X264编码视频
环境准备
- 使用git clone 下载x264源码
https://www.videolan.org/developers/x264.html - 如果电脑之前没有安装过 yasm,nasm 可以使用 brew 安装一下
brew install yasm
brew install nasm
- 进入到工程根目录下编译
// 配置开启动态库，也可以不开启，默认MAC会安装在/usr/local目录下，其他可以使用./confiure --help 查看帮助
1. ./configure --enable-shared
// 配置成功后，开启编译
2. make
// 将编译完的产物安装到指定的目录
3. make install
x264 install 成功之后命令行会输出安装到的目录
install -d /usr/local/bin
install x264 /usr/local/bin
install -d /usr/local/include /usr/local/lib/pkgconfig
install -m 644 ./x264.h x264_config.h /usr/local/include
install -m 644 x264.pc /usr/local/lib/pkgconfig
install -d /usr/local/lib
ln -f -s libx264.164.dylib /usr/local/lib/libx264.dylib
install -m 755 libx264.164.dylib /usr/local/lib
命令行使用
如
x264 -o akiyo.264 --input-res=352x288 --input-csp=i420 --input-depth=8 akiyo_cif.yuv
更多使用方式可以参考
x264 --help
工程使用
我使用的是vscode + cmake
因为安装的时候将pkgconfig 安装到了这个路径
/usr/local/lib/pkgconfig/x264
可以打开该文件看看内容，描写了这个库的头文件路径，二进制文件路径等
1 prefix=/usr/local
2 exec_prefix=${prefix}
3 libdir=${exec_prefix}/lib
4 includedir=${prefix}/include
5
6 Name: x264
7 Description: H.264 (MPEG4 AVC) encoder library
8 Version: 0.164.3075
9 Libs: -L${exec_prefix}/lib -lx264
10 Libs.private: -lpthread -lm -ldl
11 Cflags: -I${prefix}/include -DX264_API_IMPORTS
同时使用
pkg-config 命令确保,pkgconfig能够搜索到
pkgconfig pkg-config --list-all | grep x264
x264 x264 - H.264 (MPEG4 AVC) encoder library
如搜索不到，可配置环境变量试试
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
pkgconfig 可以帮助我们简化依赖
- 资源准备
yuv 视频源： http://trace.eas.asu.edu/yuv/index.html
查看YUV视频源工具： https://files.cnblogs.com/littlejohnny/YUVviewer_src.rar
https://github.com/IENT/YUView/releases
我下载了一个资源名,名称为：akiyo_cif,是一个I420,8位深的资源
- CMakeList.txt
cmake_minimum_required(VERSION 3.14)
project(x264_encoder)
set(CMAKE_CXX_STANDARD 11) # Enable c++11 standard
set(CMAKE_BUILD_TYPE Debug)
set(SOURCE_FILES X264Encoder.cpp)
# https://cmake.org/cmake/help/latest/module/FindPkgConfig.html
# https://zhuanlan.zhihu.com/p/111155574
find_package(PkgConfig REQUIRED)
// 使用PkgConfig寻找module
pkg_check_modules(x264 REQUIRED IMPORTED_TARGET x264 )
add_executable(x264_encoder ${SOURCE_FILES})
target_link_libraries(${PROJECT_NAME} PRIVATE PkgConfig::x264)
- 代码
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <iomanip>
#include <x264.h>
// https://blog.csdn.net/leixiaohua1020/article/details/42078645
int main(int argv, const char *args[])
{
FILE *fp_src = fopen("res/akiyo_cif.yuv", "rb");
FILE *fp_dst = fopen("res/akiyo_cif_code.h264", "wb");
// 352x288
int width = 352;
int height = 288;
int csp = X264_CSP_I420;
// 设置为0，会根据文件大小计算帧数
// 如果帧数设置的太小，可能会造成没有编码后的结果
int frameNum = 0;
if (fp_src && fp_dst)
{
x264_picture_t *pPic_in = new x264_picture_t();
x264_picture_t *pPic_out = new x264_picture_t();
x264_param_t *pParam = new x264_param_t();
x264_param_default(pParam);
// 根据资源的大小设置的尺寸
// YUVView可以查看YUV资源的信息
pParam->i_width = 352;
pParam->i_height = 288;
pParam->i_csp = csp;
// https://blog.csdn.net/lcalqf/article/details/65635333
x264_param_apply_profile(pParam, x264_profile_names[5]);
x264_t *pHander = x264_encoder_open(pParam);
x264_picture_init(pPic_out);
x264_picture_alloc(pPic_in, csp, pParam->i_width, pParam->i_height);
int ySize = pParam->i_width * pParam->i_height;
if (frameNum == 0)
{
switch (csp)
{
case X264_CSP_I420:
fseek(fp_src, 0, SEEK_END);
frameNum = ftell(fp_src) / (ySize * 3 / 2);
fseek(fp_src, 0, SEEK_SET);
break;
default:
std::cout << "Colorespace are not support." << std::endl;
return -1;
}
}
x264_nal_t *pNals = nullptr;
int iNal = 0;
// Loop to encode
for (int i = 0; i < frameNum; i++)
{
switch (csp)
{
case X264_CSP_I420:
// https://www.cplusplus.com/reference/cstdio/fseek/
fread(pPic_in->img.plane[0], ySize, 1, fp_src); // Y
fread(pPic_in->img.plane[1], ySize / 4, 1, fp_src); // U
fread(pPic_in->img.plane[2], ySize / 4, 1, fp_src); // V
break;
default:
std::cout << "Coloresapce are not support." << std::endl;
return -1;
}
// PTS VS DTS
// https://bitmovin.com/docs/encoding/faqs/why-is-an-timestamp-offset-for-ts-muxings-applied-by-default
pPic_in->i_pts = i;
int ret = x264_encoder_encode(pHander, &pNals, &iNal, pPic_in, pPic_out);
if (ret < 0)
{
std::cout << "Error encode." << std::endl;
return -1;
}
std::cout << "success encode frame" << std::setw(5) << i << std::endl;
for (int j = 0; j < iNal; j++)
{
std::cout << "write nal to file" << std::setw(5) << j << std::endl;
fwrite(pNals[j].p_payload, 1, pNals[j].i_payload, fp_dst);
}
}
std::cout << "to flush" << std::endl;
// flush
while (true)
{
int ret = x264_encoder_encode(pHander, &pNals, &iNal, pPic_in, pPic_out);
if (ret == 0)
{
break;
}
else if (ret < 0)
{
std::cout << "Error encode ." << std::endl;
break;
}
else
{
std::cout << "Flush 1 frame." << std::endl;
for (int j = 0; j < iNal; j++)
{
fwrite(pNals[j].p_payload, 1, pNals[j].i_payload, fp_dst);
}
break;
}
}
// clean
std::cout << "to clean resource" << std::endl;
x264_picture_clean(pPic_in);
x264_encoder_close(pHander);
pHander = nullptr;
delete pPic_in;
delete pPic_out;
delete pParam;
fclose(fp_src);
fclose(fp_dst);
return 0;
}
else
{
char *buffer;
if ((buffer = getcwd(nullptr, 0)) == nullptr)
{
std::cout << "get cwd error." << std::endl;
free(buffer);
}
else
{
std::cout << "Error open files. "
<< "the current dir is "
<< buffer
<< std::endl
<< "The fpSrc is"
<< fp_src
<< "the fpDst is "
<< fp_dst
<< std::endl;
}
return -1;
}
}