YUV420视频上面添加字幕

1、source_code
main.c中实现了函数draw_Font_Func()，这个函数可以直接移植到C程序中使用。
zimo.h里面放的是字模转码后的数据。

2、data_yuv
测试用的yuv420数据(352*288) CIF格式，测试前后的数据。

3、zimo_gr.zip
取字幕的软件

 /*
 * Copyright(C), 2008-2013, Ubuntu Inc.
 * File name:        main.c
 * Author:           xubinbin 徐彬彬 (Beijing China)
 * Version:          1.0
 * Date:             2013.06.09
 * Description:
 * Function List:    char *draw_Font_Func(char *ptr_frame,const unsigned char font[],int startx,int starty,int color)
 * Email:            xubbwd@gmail.com
 */

 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
 #include <string.h>

 #include "zimo.h"

 #define FRAME_WIDTH             (352)
 #define FRAME_HEIGHT            (288)
 #define FRAME_SIZE              (FRAME_WIDTH*FRAME_HEIGHT*3/2)
 #define IN_FILENAME             "in.raw"
 #define OUT_FILENAME            "out.raw"

 const unsigned char table[] = {

 /*--  文字:  陈  --*/
 /*--  楷体_GB231212;  此字体下对应的点阵为：宽x高=16x16   --*/
 0x00,0x40,0x78,0x40,0x48,0x40,0x57,0xFE,0x50,0x80,0x61,0x20,0x51,0x20,0x4A,0x20,
 0x4B,0xFC,0x48,0x20,0x69,0x28,0x51,0x24,0x42,0x22,0x44,0x22,0x40,0xA0,0x40,0x40,

 /*--  文字:  桂  --*/
 /*--  楷体_GB231212;  此字体下对应的点阵为：宽x高=16x16   --*/
 0x10,0x20,0x10,0x20,0x11,0xFC,0x10,0x20,0xFC,0x20,0x10,0x20,0x33,0xFE,0x38,0x00,
 0x54,0x20,0x54,0x20,0x91,0xFC,0x10,0x20,0x10,0x20,0x10,0x20,0x13,0xFE,0x10,0x00,

 /*--  文字:  芳  --*/
 /*--  楷体_GB231212;  此字体下对应的点阵为：宽x高=16x16   --*/
 0x08,0x20,0x08,0x20,0xFF,0xFE,0x08,0x20,0x0A,0x20,0x01,0x00,0xFF,0xFE,0x04,0x00,
 0x04,0x00,0x07,0xF0,0x04,0x10,0x08,0x10,0x08,0x10,0x10,0x10,0x20,0xA0,0x40,0x40,

 };

 /*
 * Function:     draw_Font_Func
 * Description:  实现在yuv420图片上面画字
 * Input:        char *ptr_frame             一帧视频的首地址
 *               const unsigned char font[]  画的字模
 *               int startx                  写字的起点坐标x
 *               int starty                  写字的起点坐标y
 *               int color                   字颜色的选择，具体颜色在程序代码
 * Return:       这里会把传进来的一帧视频的地址返回，可以不调用
 */
 char *draw_Font_Func(char *ptr_frame,const unsigned char font[],int startx,int starty,int color)
 {

     assert( ptr_frame != NULL );

     int tagY=,tagU=,tagV=;
     char *offsetY=NULL,*offsetU=NULL,*offsetV=NULL;
     unsigned short p16, mask16; // for reading hzk16 dots

     /*yuv 地址的设置 */
     offsetY = ptr_frame;
     offsetU = offsetY + FRAME_WIDTH * FRAME_HEIGHT;
     offsetV = offsetU + FRAME_WIDTH * FRAME_HEIGHT/;

     switch (color)
     {
         case :         // Yellow
             tagY = ;tagU = ;tagV = ;
             break;
         case :         // Red
             tagY = ;tagU = ;tagV = ;
             break;
         case :         // Green
             tagY = ;tagU = ;tagV = ;
             break;
         case :         // Blue
             tagY = ;tagU = ;tagV = ;
             break;
         default:        // White
             tagY = ;tagU = ;tagV = ;
     }  

     int x=,y=,i=,j=,k=;
     for(i = ; i < ; i++)
     {
     #if 0
         for (j = , y = starty; j <  && y < FRAME_HEIGHT - ; j++, y+=)    // line dots per char
         {
             p16 = *(unsigned short *)(font + j* + i*);/*取字模数据*/
             mask16 = 0x0080;  /* 二进制 1000 0000 */
             for (k = , x = startx +i*; k <  && x < FRAME_WIDTH - ; k++, x+=)   // dots in a line
             {
                 if (p16 & mask16)
                 {
                     *(offsetY + y*FRAME_WIDTH + x) = *(offsetY + y*FRAME_WIDTH + x+) = tagY;
                     *(offsetY + (y+)*FRAME_WIDTH + x) = *(offsetY + (y+)*FRAME_WIDTH + x+) = tagY;
                     *(offsetU + y * FRAME_WIDTH/ + x/) =tagU;
                     *(offsetV + y * FRAME_WIDTH/ + x/) = tagV;
                 }
                 mask16 = mask16 >> ;  /* 循环移位取数据 */
                 if (mask16 == )
                     mask16 = 0x8000;
             }
         }
     #else
         for (j = , y = starty; j <  && y < FRAME_HEIGHT - ; j++, y++) // line dots per char
         {
             p16 = *(unsigned short *)(font + j* + i*);/*取字模数据*/
             mask16 = 0x0080;  /* 二进制 1000 0000 */
             for (k = , x = startx +i*; k <  && x < FRAME_WIDTH - ; k++, x++) // dots in a line
             {
                 if (p16 & mask16)
                 {
                     *(offsetY + y*FRAME_WIDTH + x) = ;
                 //  *(offsetU + y * FRAME_WIDTH/4 + x/2) = 85;
                 //  *(offsetV + y * FRAME_WIDTH/4 + x/2) = 255;
                 }
                 mask16 = mask16 >> ;  /* 循环移位取数据 */
                 if (mask16 == )
                     mask16 = 0x8000;
             }
         }
     #endif
     }

     return (char *)ptr_frame;
 }

 int main(int argc,char * argv[])
 {
     int ret = ;
     FILE *in_file,*out_file;

     char *frame_buffer = NULL;
     frame_buffer = (char*)malloc(FRAME_SIZE);

     //read frame file 读原来的一帧数据
     in_file = fopen(IN_FILENAME,"r");
     if (in_file == NULL)
     {
         printf("open in file error!\n");
     }

     ret = fread(frame_buffer,FRAME_SIZE,,in_file);
     if (ret != )
     {
         printf("ret = %d\n");
         printf("fread file error!\n");
     }
     fclose(in_file);

     //数据转换
     draw_Font_Func(frame_buffer,table,,,);

     //write frame file 把数据写回
     out_file = fopen(OUT_FILENAME,"w");
     if (out_file == NULL)
     {
         printf("open in file error!\n");
     }

     ret = fwrite(frame_buffer,FRAME_SIZE,,out_file);
     if (ret != )
     {
         printf("ret = %d\n");
         printf("fwrite file error!\n");
     }
     fclose(out_file);
     free(frame_buffer);

     printf("Done!\n");
     return ;
 }