avfilter,是ffmpeg为图像和语音处理提供的滤镜子框架,代码位于libavfilter目录。
libavfilter提供了一个通用框架来实现audio和video的原始数据filter处理,如对视频添加叠加Logo图片或者时间文字等信息、对视频进行裁剪和翻转。
操作系统:Ubuntu18.04
ffmpeg版本:ffmpeg4.2.5
在使用avfilter库添加汉字水印时,ffmepg默认模式时不支持矢量字库的,要实现汉字水印添加就需要进行configure配置。
freetype下载地址:https://download.savannah.gnu.org/releases/freetype/
FriBidi下载地址:https://www.linuxfromscratch.org/blfs/view/svn/general/fribidi.html
#解压源码
tar xvf /mnt/hgfs/ubuntu/software_pack/fribidi-1.0.11.tar.xz
#配置生成Makefile
./configure --prefix=$PWD/_install
#编译安装
make && make install
#编译安装
#将生成的文件拷贝到/usr/lib目录下
cp ./_install/lib/pkgconfig/ /usr/lib -rf
#解压源码
tar xvf /mnt/hgfs/ubuntu/software_pack/ffmpeg-4.2.5.tar.bz2
#配置生成Makefile
./configure --enable-static
--enable-shared --prefix=$PWD/_install
--extra-cflags=-I/home/wbyq/src_pack/x264-master/_install/include
--extra-ldflags=-L/home/wbyq/src_pack/x264-master/_install/lib
--extra-cflags=-I/home/wbyq/src_pack/freetype-2.10.0/_install/include
--extra-ldflags=-L/home/wbyq/src_pack/freetype-2.10.0/_install/lib
--extra-cflags=-I/home/wbyq/src_pack/fribidi-1.0.11/_install/include
--extra-ldflags=-L/home/wbyq/src_pack/fribidi-1.0.11/_install/lib
--enable-ffmpeg --enable-libx264 --enable-gpl --enable-libfreetype --enable-libfontconfig --enable-libfribidi --enable-avfilter
#编译安装
make && make install
#将生成的文件拷贝到/usr/lib目录下
cp ./_install/lib/pkgconfig/ /usr/lib -rf
ffmpeg -i 最后一滴水.mp4 -vf drawtext=“fontfile=msyhbd.ttc:x=100:y=10:fontcolor=white:fontsize=30:expansion=strftime:basetime=$(date +%s )000000:text=‘%Y-%m-%d %H:%M: %S’” output.mp4
drawtext 字符串水印
fontfile=msyhbd.ttc矢量字库,可在windows下C:WindowsFonts拷贝到当期目录下
x=100:y=10显示位置,距离左上脚
fontcolor=white:fontsize=30字体颜色和大小
expansion=strftime:basetime=$(date +%s )000000以当前实时时间添加动态水印
text=‘%Y-%m-%d %H:%M: %S’ 时间显示格式
ffmpeg -i 最后一滴水.mp4 -vf drawtext="fontfile=msyhbd.ttc:x=100:y=10:fontcolor=white:fontsize=30:expansion=strftime:basetime=$(date +%s -d '2020-8-8 14:10:50')000000:text='%Y-%m-%d %H:%M: %S' IT_阿水" output.mp4
参考雷霄骅博客处理示例:https://blog.csdn.net/leixiaohua1020/article/details/50618190
致敬雷神!致敬雷神!致敬雷神!
#include
#include
#include
#include
#include
#include
#include
#define FILE_SRC "sintel_480x272_yuv420p.yuv" //源文件
int waterMark(AVFrame *frame_in,AVFrame *frame_out,int w,int h,const char *str);
int main(int argc,char *argv[])
{
int ret;
/*打开输入yuv文件*/
FILE *fp_in=fopen(FILE_SRC,"rb+");
if(fp_in==NULL)
{
printf("文件打开失败n");
return 0;
}
int in_width=480;
int in_height=272;
/*处理后的文件*/
FILE *fp_out=fopen("new.yuv","wb+");
if(fp_out==NULL)
{
printf("文件创建失败n");
return 0;
}
char buff[50];
AVFrame *frame_in=av_frame_alloc();
unsigned char *frame_buffer_in;
frame_buffer_in=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P,in_width,in_height,4));
/*根据图像设置图像指针和内存对齐方式*/
av_image_fill_arrays(frame_in->data,frame_in->linesize,frame_buffer_in,AV_PIX_FMT_YUV420P,in_width,in_height,4);
AVFrame *frame_out=av_frame_alloc();
unsigned char *frame_buffer_out;
frame_buffer_out=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P,in_width,in_height,4));
av_image_fill_arrays(frame_out->data,frame_out->linesize,frame_buffer_out,AV_PIX_FMT_YUV420P,in_width,in_height,4);
frame_in->width=in_width;
frame_in->height=in_height;
frame_in->format=AV_PIX_FMT_YUV420P;
char sys_time[64];
time_t sec,sec2;
while(1)
{
if(fread(frame_buffer_in,1,in_width*in_height*3/2,fp_in)!=in_width*in_height*3/2)
{
break;
}
frame_in->data[0]=frame_buffer_in;
frame_in->data[1]=frame_buffer_in+in_width*in_height;
frame_in->data[2]=frame_buffer_in+in_width*in_height*5/4;
sec=time(NULL);
if(sec!=sec2)
{
sec2=sec;
struct tm* today = localtime(&sec2);
strftime(sys_time, sizeof(sys_time), "%Y/%m/%d %H:%M:%S", today);
}
waterMark(frame_in,frame_out,in_width,in_height,sys_time);//添加水印
/*添加水印后的数据写入到过滤器*/
if(frame_out->format==AV_PIX_FMT_YUV420P)
{
for(int i=0;iheight;i++)
{
fwrite(frame_out->data[0]+frame_out->linesize[0]*i,1,frame_out->width,fp_out);
}
for(int i=0;iheight/2;i++)
{
fwrite(frame_out->data[1]+frame_out->linesize[1]*i,1,frame_out->width/2,fp_out);
}
for(int i=0;iheight/2;i++)
{
fwrite(frame_out->data[2]+frame_out->linesize[2]*i,1,frame_out->width/2,fp_out);
}
printf("一帧数据处理完成n");
}
av_frame_unref(frame_out);
}
fclose(fp_in);
fclose(fp_out);
av_frame_free(&frame_in);
av_frame_free(&frame_out);
return 0;
}
int waterMark(AVFrame *frame_in,AVFrame *frame_out,int w,int h,const char *str)
{
int ret;
/*根据名字获取ffmegding定义的filter*/
const AVFilter *buffersrc=avfilter_get_by_name("buffer");//原始数据
const AVFilter *buffersink=avfilter_get_by_name("buffersink");//处理后的数据
/*动态分配AVFilterInOut空间*/
AVFilterInOut *outputs=avfilter_inout_alloc();
AVFilterInOut *inputs=avfilter_inout_alloc();
/*创建AVFilterGraph,分配空间*/
AVFilterGraph *filter_graph;//对filters系统的整体管理结构体
filter_graph = avfilter_graph_alloc();
enum AVPixelFormat pix_fmts[]={AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE};//设置格式
/*过滤器参数:解码器的解码帧将被插入这里。*/
char args[256];
snprintf(args, sizeof(args),
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
w,h,AV_PIX_FMT_YUV420P,1,25,1,1);//图像宽高,格式,帧率,画面横纵比
/*创建过滤器上下文,源数据AVFilterContext*/
AVFilterContext *buffersrc_ctx;
ret=avfilter_graph_create_filter(&buffersrc_ctx,buffersrc,"in",args,NULL,filter_graph);
if(ret<0)
{
printf("创建src过滤器上下文失败AVFilterContextn");
return -1;
}
/*创建过滤器上下文,处理后数据buffersink_params*/
AVBufferSinkParams *buffersink_params;
buffersink_params=av_buffersink_params_alloc();
buffersink_params->pixel_fmts=pix_fmts;//设置格式
AVFilterContext *buffersink_ctx;
ret=avfilter_graph_create_filter(&buffersink_ctx,buffersink,"out",NULL,buffersink_params,filter_graph);
av_free(buffersink_params);
if(ret<0)
{
printf("创建sink过滤器上下文失败AVFilterContextn");
return -2;
}
/*过滤器链输入/输出链接列表*/
outputs->name =av_strdup("in");
outputs->filter_ctx =buffersrc_ctx;
outputs->pad_idx =0;
outputs->next =NULL;
inputs->name =av_strdup("out");
inputs->filter_ctx =buffersink_ctx;
inputs->pad_idx =0;
inputs->next =NULL;
char filter_desrc[200]={0};//要添加的水印数据
snprintf(filter_desrc,sizeof(filter_desrc),"drawtext=fontfile=msyhbd.ttc:fontcolor=green:fontsize=20:x=50:y=20:text='%snIT_阿水'",str);
if(avfilter_graph_parse_ptr(filter_graph,filter_desrc,&inputs,&outputs, NULL)<0)//设置过滤器数据内容
{
printf("添加字符串信息失败n");
return -3;
}
/*检测配置信息是否正常*/
if(avfilter_graph_config(filter_graph,NULL)<0)
{
printf("配置信息有误n");
return -4;
}
#if 0
/*
查找要在使用的过滤器,将要触处理的数据添加到过滤器
注意:时间若从外面传入(即144行数据已完整),则此处不需要查找,直接添加即可,否则需要添加下面代码
*/
AVFilterContext* filter_ctx;//上下文
int parsed_drawtext_0_index = -1;
for(int i=0;inb_filters;i++)//查找使用的过滤器
{
AVFilterContext *filter_ctxn=filter_graph->filters[i];
printf("[%s %d]:filter_ctxn_name=%sn",__FUNCTION__,__LINE__,filter_ctxn->name);
if(!strcmp(filter_ctxn->name,"Parsed_drawtext_0"))
{
parsed_drawtext_0_index=i;
}
}
if(parsed_drawtext_0_index==-1)
{
printf("[%s %d]:no Parsed_drawtext_0n",__FUNCTION__,__LINE__);//没有找到过滤器
}
filter_ctx=filter_graph->filters[parsed_drawtext_0_index];//保存找到的过滤器
/*获取系统时间,将时间加入到过滤器*/
char sys_time[64];
time_t sec,sec2;
sec=time(NULL);
if(sec!=sec2)
{
sec2=sec;
struct tm* today = localtime(&sec2);
strftime(sys_time, sizeof(sys_time), "%Y/%m/%d %H:%M:%S", today); //24小时制
}
av_opt_set(filter_ctx->priv, "text", sys_time, 0 ); //设置text到过滤器
#endif
/*往源滤波器buffer中输入待处理数据*/
if(av_buffersrc_add_frame(buffersrc_ctx,frame_in)<0)
{
return -5;
}
/*从滤波器中输出处理数据*/
if(av_buffersink_get_frame(buffersink_ctx, frame_out)<0)
{
return -6;
}
avfilter_inout_free(&outputs);
avfilter_inout_free(&inputs);
avfilter_graph_free(&filter_graph);
return 0;
}
Makefile文件:
OBJ=addwatermart.o
CFLAGS =-I/home/wbyq/src_pack/ffmpeg-4.2.5/_install/include -L/home/wbyq/src_pack/ffmpeg-4.2.5/_install/lib
CFLAGS +=-lpthread -lm -ldl -lSDL2_image -lavcodec -lavfilter -lavutil -lswresample -lavdevice -lavformat -lpostproc -lswscale -lpthread -lstdc++ -lm -lasound -lavfilter -lfreetype
app:$(OBJ)
gcc -o app $(OBJ) $(CFLAGS)
.PHONY=clean
clean:
rm app -f
本示例实现效果为动态添加时间水印。示例效果:
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