X264库直接压缩BITMAP格式数据

Posted 2020-07-07 黄山松 (Tom Huang)

最近帮朋友看了下X264压缩视频，主要参考了雷霄骅(leixiaohua1020)的专栏的开源代码：

http://blog.csdn.net/leixiaohua1020/article/details/42078645

但网上能找到的例子都是把YUV（如I420等）编码为H264的，在编码BITMAP格式的RGB数据之前其实不需要自己转换数据格式，只要把源数据格式指定一下就可以了，X264库可以自动处理。

如下：

 

int csp=X264_CSP_BGR|X264_CSP_VFLIP;    //这个格式是BITMAP的那种颠倒的BGR的格式

int csp = X264_CSP_I420;        //这个是I420格式

 

同时也试验了一下X264VFW库，有很多问题（压缩到内存不知道为什么不灵，直接压缩到文件时路径和文件名不支持中文等），不好用，建议大家不要用那个库试验了，X264官网也不推荐这个库。

 

把雷霄骅的代码也转帖如下，其中加了几条注释：（那篇博文禁止未经许可转载，里面的代码不知道能否随便贴在这里？）

/**
 * 最简单的基于X264的视频编码器
 * Simplest X264 Encoder
 *
 * 雷霄骅 Lei Xiaohua
 * [email protected]
 * 中国传媒大学/数字电视技术
 * Communication University of China / Digital TV Technology
 * http://blog.csdn.net/leixiaohua1020
 *
 * 本程序可以YUV格式的像素数据编码为H.264码流，是最简单的
 * 基于libx264的视频编码器
 *
 * This software encode YUV data to H.264 bitstream.
 * It‘s the simplest encoder example based on libx264.
 */
#include <stdio.h>
#include <stdlib.h>
 
#include "stdint.h"
 
#if defined ( __cplusplus)
extern "C"
{
#include "x264.h"
};
#else
#include "x264.h"
#endif
 
 
int main(int argc, char** argv)
{
 
         int ret;
         int y_size;
         int i,j;
 
         //FILE* fp_src  = fopen("../cuc_ieschool_640x360_yuv444p.yuv", "rb");
         FILE* fp_src  = fopen("../cuc_ieschool_640x360_yuv420p.yuv", "rb");
 
         FILE* fp_dst = fopen("cuc_ieschool.h264", "wb");
        
         //Encode 50 frame
         //if set 0, encode all frame
         int frame_num=50;
         int csp=X264_CSP_I420;
         //TOM注释：如果直接压缩bitmap格式的rgb数据，需要修改这句话为int csp=X264_CSP_BGR|X264_CSP_VFLIP;
         int width=640,height=360;
 
         int iNal   = 0;
         x264_nal_t* pNals = NULL;
         x264_t* pHandle   = NULL;
         x264_picture_t* pPic_in = (x264_picture_t*)malloc(sizeof(x264_picture_t));
         x264_picture_t* pPic_out = (x264_picture_t*)malloc(sizeof(x264_picture_t));
         x264_param_t* pParam = (x264_param_t*)malloc(sizeof(x264_param_t));
        
         //Check
         if(fp_src==NULL||fp_dst==NULL){
                   printf("Error open files.\n");
                   return -1;
         }
 
         x264_param_default(pParam);

         //TOM注释：上面这个缺省参数是two pass模式的选项，如果要实时压缩，需要用one pass模式，这句话修改为：
          //x264_param_default_preset(pParam, "veryfast", "zerolatency");  

         pParam->i_width   = width;
         pParam->i_height  = height;
         /*
         //Param
         pParam->i_log_level  = X264_LOG_DEBUG;
         pParam->i_threads  = X264_SYNC_LOOKAHEAD_AUTO;
         pParam->i_frame_total = 0;
         pParam->i_keyint_max = 10;
         pParam->i_bframe  = 5;
         pParam->b_open_gop  = 0;
         pParam->i_bframe_pyramid = 0;
         pParam->rc.i_qp_constant=0;
         pParam->rc.i_qp_max=0;
         pParam->rc.i_qp_min=0;
         pParam->i_bframe_adaptive = X264_B_ADAPT_TRELLIS;
         pParam->i_fps_den  = 1;
         pParam->i_fps_num  = 25;
         pParam->i_timebase_den = pParam->i_fps_num;
         pParam->i_timebase_num = pParam->i_fps_den;
         */
         pParam->i_csp=csp;
         x264_param_apply_profile(pParam, x264_profile_names[5]);
        
         pHandle = x264_encoder_open(pParam);
   
         x264_picture_init(pPic_out);
         x264_picture_alloc(pPic_in, csp, pParam->i_width, pParam->i_height);
 
         //ret = x264_encoder_headers(pHandle, &pNals, &iNal);
 
         y_size = pParam->i_width * pParam->i_height;
         //detect frame number
         if(frame_num==0){
                   fseek(fp_src,0,SEEK_END);
                   switch(csp){
                   case X264_CSP_I444:frame_num=ftell(fp_src)/(y_size*3);break;
                   case X264_CSP_I420:frame_num=ftell(fp_src)/(y_size*3/2);break;
                   default:printf("Colorspace Not Support.\n");return -1;
                   }
                   fseek(fp_src,0,SEEK_SET);
         }
        
         //Loop to Encode
         for( i=0;i<frame_num;i++){
                   switch(csp){
                   case X264_CSP_I444:{
                            fread(pPic_in->img.plane[0],y_size,1,fp_src);         //Y
                            fread(pPic_in->img.plane[1],y_size,1,fp_src);         //U
                            fread(pPic_in->img.plane[2],y_size,1,fp_src);         //V
                            break;}
                   case X264_CSP_I420:{
                            fread(pPic_in->img.plane[0],y_size,1,fp_src);         //Y
                            fread(pPic_in->img.plane[1],y_size/4,1,fp_src);     //U
                            fread(pPic_in->img.plane[2],y_size/4,1,fp_src);     //V
                            break;}
                   default:{
                            printf("Colorspace Not Support.\n");
                            return -1;}
                   }
                   pPic_in->i_pts = i;
 
                   ret = x264_encoder_encode(pHandle, &pNals, &iNal, pPic_in, pPic_out);
                   if (ret< 0){
                            printf("Error.\n");
                            return -1;
                   }
 
                   printf("Succeed encode frame: %5d\n",i);
 
                   for ( j = 0; j < iNal; ++j){
                         //TOM注释：如果是one pass模式，在这里保存，two pass模式，iNal为0，这里不会被调用

                             fwrite(pNals[j].p_payload, 1, pNals[j].i_payload, fp_dst);
                   }
         }
         i=0;
         //flush encoder
         while(1){
                   ret = x264_encoder_encode(pHandle, &pNals, &iNal, NULL, pPic_out);
                   if(ret==0){
                            //TOM注释：如果是one pass 模式，前面已经保存完了，直接在这里break
                            break;
                   }
                   printf("Flush 1 frame.\n");
                   for (j = 0; j < iNal; ++j){
                        //TOM注释：如果为two pass模式，在这里保存
                            fwrite(pNals[j].p_payload, 1, pNals[j].i_payload, fp_dst);
                   }
                   i++;
         }
         x264_picture_clean(pPic_in);
         x264_encoder_close(pHandle);
         pHandle = NULL;
 
         free(pPic_in);
         free(pPic_out);
         free(pParam);
 
         fclose(fp_src);
         fclose(fp_dst);
 
         return 0;
}