FFMpeg对AVFilter效果处理

转载是雷博的文章,有关FFMpeg对AVFilter效果处理

http://blog.csdn.net/leixiaohua1020/article/details/50618190

 

#include <stdio.h>

#define __STDC_CONSTANT_MACROS

#ifdef _WIN32
#define snprintf _snprintf
//Windows
extern "C"
{
#include "libavfilter/avfiltergraph.h"
#include "libavfilter/buffersink.h"
#include "libavfilter/buffersrc.h"
#include "libavutil/avutil.h"
#include "libavutil/imgutils.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include <libavfilter/avfiltergraph.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libavutil/avutil.h>
#include <libavutil/imgutils.h>
#ifdef __cplusplus
};
#endif
#endif

 

int main(int argc, char* argv[])
{
int ret;
AVFrame *frame_in;
AVFrame *frame_out;
unsigned char *frame_buffer_in;
unsigned char *frame_buffer_out;

AVFilterContext *buffersink_ctx;
AVFilterContext *buffersrc_ctx;
AVFilterGraph *filter_graph;
static int video_stream_index = -1;

//Input YUV
FILE *fp_in=fopen("sintel_480x272_yuv420p.yuv","rb+");
if(fp_in==NULL){
printf("Error open input file.\n");
return -1;
}
int in_width=480;
int in_height=272;

//Output YUV
FILE *fp_out=fopen("output.yuv","wb+");
if(fp_out==NULL){
printf("Error open output file.\n");
return -1;
}

//const char *filter_descr = "lutyuv='u=128:v=128'";
const char *filter_descr = "boxblur";
//const char *filter_descr = "hflip";
//const char *filter_descr = "hue='h=60:s=-3'";
//const char *filter_descr = "crop=2/3*in_w:2/3*in_h";
//const char *filter_descr = "drawbox=x=100:y=100:w=100:h=100:color=pink@0.5";
//const char *filter_descr = "drawtext=fontfile=arial.ttf:fontcolor=green:fontsize=30:text='Lei Xiaohua'";

avfilter_register_all();

char args[512];
AVFilter *buffersrc = avfilter_get_by_name("buffer");
AVFilter *buffersink = avfilter_get_by_name("ffbuffersink");
AVFilterInOut *outputs = avfilter_inout_alloc();
AVFilterInOut *inputs = avfilter_inout_alloc();
enum PixelFormat pix_fmts[] = { AV_PIX_FMT_YUV420P, PIX_FMT_NONE };
AVBufferSinkParams *buffersink_params;

filter_graph = avfilter_graph_alloc();

/* buffer video source: the decoded frames from the decoder will be inserted here. */
snprintf(args, sizeof(args),
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
in_width,in_height,AV_PIX_FMT_YUV420P,
1, 25,1,1);

ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
args, NULL, filter_graph);
if (ret < 0) {
printf("Cannot create buffer source\n");
return ret;
}

/* buffer video sink: to terminate the filter chain. */
buffersink_params = av_buffersink_params_alloc();
buffersink_params->pixel_fmts = pix_fmts;
ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
NULL, buffersink_params, filter_graph);
av_free(buffersink_params);
if (ret < 0) {
printf("Cannot create buffer sink\n");
return ret;
}

/* Endpoints for the filter graph. */
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;

if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_descr,
&inputs, &outputs, NULL)) < 0)
return ret;

if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
return ret;

frame_in=av_frame_alloc();
frame_buffer_in=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, in_width,in_height,1));
av_image_fill_arrays(frame_in->data, frame_in->linesize,frame_buffer_in,
AV_PIX_FMT_YUV420P,in_width, in_height,1);

frame_out=av_frame_alloc();
frame_buffer_out=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, in_width,in_height,1));
av_image_fill_arrays(frame_out->data, frame_out->linesize,frame_buffer_out,
AV_PIX_FMT_YUV420P,in_width, in_height,1);

frame_in->width=in_width;
frame_in->height=in_height;
frame_in->format=AV_PIX_FMT_YUV420P;

while (1) {

if(fread(frame_buffer_in, 1, in_width*in_height*3/2, fp_in)!= in_width*in_height*3/2){
break;
}
//input Y,U,V
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;

if (av_buffersrc_add_frame(buffersrc_ctx, frame_in) < 0) {
printf( "Error while add frame.\n");
break;
}

/* pull filtered pictures from the filtergraph */
ret = av_buffersink_get_frame(buffersink_ctx, frame_out);
if (ret < 0)
break;

//output Y,U,V
if(frame_out->format==AV_PIX_FMT_YUV420P){
for(int i=0;i<frame_out->height;i++){
fwrite(frame_out->data[0]+frame_out->linesize[0]*i,1,frame_out->width,fp_out);
}
for(int i=0;i<frame_out->height/2;i++){
fwrite(frame_out->data[1]+frame_out->linesize[1]*i,1,frame_out->width/2,fp_out);
}
for(int i=0;i<frame_out->height/2;i++){
fwrite(frame_out->data[2]+frame_out->linesize[2]*i,1,frame_out->width/2,fp_out);
}
}
printf("Process 1 frame!\n");
av_frame_unref(frame_out);
}

fclose(fp_in);
fclose(fp_out);

av_frame_free(&frame_in);
av_frame_free(&frame_out);
avfilter_graph_free(&filter_graph);

return 0;
}