FFMpeg将YUV转码为H264

#include 


#define __STDC_CONSTANT_MACROS


#ifdef _WIN32
//Windows
extern "C"
{
#include "libavutil/opt.h"
#include "libavcodec/avcodec.h"
#include "libavutil/imgutils.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include 
#include 
#include 
#ifdef __cplusplus
};
#endif
#endif
#pragma comment(lib, "avcodec.lib")   
#pragma comment(lib, "avutil.lib")  
//test different codec
#define TEST_H264  1
#define TEST_HEVC  0




int main(int argc, char* argv[])
{
	AVCodec *pCodec;
    AVCodecContext *pCodecCtx= NULL;
    int i, ret, got_output;
    FILE *fp_in;
	FILE *fp_out;
    AVFrame *pFrame;
    AVPacket pkt;
	int y_size;
	int framecnt=0;


	char filename_in[]="ds_480x272.yuv";


#if TEST_HEVC
	AVCodecID codec_id=AV_CODEC_ID_HEVC;
	char filename_out[]="ds.hevc";
#else
	AVCodecID codec_id=AV_CODEC_ID_H264;
	char filename_out[]="ds.h264";
#endif




	int in_w=480,in_h=272;	
	int framenum=100;	


	avcodec_register_all();


    pCodec = avcodec_find_encoder(codec_id);
    if (!pCodec) {
        printf("Codec not found\n");
        return -1;
    }
    pCodecCtx = avcodec_alloc_context3(pCodec);
    if (!pCodecCtx) {
        printf("Could not allocate video codec context\n");
        return -1;
    }
    pCodecCtx->bit_rate = 400000;
    pCodecCtx->width = in_w;
    pCodecCtx->height = in_h;
    pCodecCtx->time_base.num=1;
	pCodecCtx->time_base.den=25;
    pCodecCtx->gop_size = 10;
    pCodecCtx->max_b_frames = 1;
    pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;


    if (codec_id == AV_CODEC_ID_H264)
        av_opt_set(pCodecCtx->priv_data, "preset", "slow", 0);
 
    if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
        printf("Could not open codec\n");
        return -1;
    }
    
    pFrame = av_frame_alloc();
    if (!pFrame) {
        printf("Could not allocate video frame\n");
        return -1;
    }
    pFrame->format = pCodecCtx->pix_fmt;
    pFrame->width  = pCodecCtx->width;
    pFrame->height = pCodecCtx->height;


    ret = av_image_alloc(pFrame->data, pFrame->linesize, pCodecCtx->width, pCodecCtx->height,
                         pCodecCtx->pix_fmt, 16);
    if (ret < 0) {
        printf("Could not allocate raw picture buffer\n");
        return -1;
    }
	//Input raw data


	fp_in = fopen(filename_in, "rb");
	if (!fp_in) {
		printf("Could not open %s\n", filename_in);
		return -1;
	}
	//Output bitstream
	fp_out = fopen(filename_out, "wb");
	if (!fp_out) {
		printf("Could not open %s\n", filename_out);
		return -1;
	}


	y_size = pCodecCtx->width * pCodecCtx->height;
    //Encode
    for (i = 0; i < framenum; i++) {
        av_init_packet(&pkt);
        pkt.data = NULL;    // packet data will be allocated by the encoder
        pkt.size = 0;
		//Read raw YUV data
		if (fread(pFrame->data[0],1,y_size,fp_in)<= 0||		// Y
			fread(pFrame->data[1],1,y_size/4,fp_in)<= 0||	// U
			fread(pFrame->data[2],1,y_size/4,fp_in)<= 0){	// V
			return -1;
		}else if(feof(fp_in)){
			break;
		}


        pFrame->pts = i;
        /* encode the image */
        ret = avcodec_encode_video2(pCodecCtx, &pkt, pFrame, &got_output);
        if (ret < 0) {
            printf("Error encoding frame\n");
            return -1;
        }
        if (got_output) {
            printf("Succeed to encode frame: %5d\tsize:%5d\n",framecnt,pkt.size);
			framecnt++;
            fwrite(pkt.data, 1, pkt.size, fp_out);
            av_free_packet(&pkt);
        }
    }
    //Flush Encoder
    for (got_output = 1; got_output; i++) {
        ret = avcodec_encode_video2(pCodecCtx, &pkt, NULL, &got_output);
        if (ret < 0) {
            printf("Error encoding frame\n");
            return -1;
        }
        if (got_output) {
            printf("Flush Encoder: Succeed to encode 1 frame!\tsize:%5d\n",pkt.size);
            fwrite(pkt.data, 1, pkt.size, fp_out);
            av_free_packet(&pkt);
        }
    }


    fclose(fp_out);
    avcodec_close(pCodecCtx);
    av_free(pCodecCtx);
    av_freep(&pFrame->data[0]);
    av_frame_free(&pFrame);


	return 0;
}

注：转码后的h264文件，可以用ffplay+路径播放

源文件19125KB，转码后188KB。压缩率非常高啊。