test video frame rate & bitrate code in linux

carlsonlee_freec

于 2011-03-09 12:17:00 发布

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CC 4.0 BY-SA版权

文章标签： video struct linux null

本文链接：https://blog.youkuaiyun.com/carlsonlee_freec/article/details/6233784

本文介绍了一个用于计算帧率(fps)和比特率(bitrate)的C语言实现。通过定时函数get_tick_count()获取当前时间，并在每30帧时计算并输出这段时间内的平均帧率和比特率。

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static long get_tick_count()
{
   struct timeval tv;
   gettimeofday(&tv, NULL);
   return (tv.tv_sec * 1000 + tv.tv_usec/1000);
}

static void test_fps_bitrate(int frame_size)
{
   static int frames_num =0;
   static long start_time = 1;
   static long total_frame_size = 0;
   if(start_time == 1)
   {
       start_time = get_tick_count();
   }
   frames_num++;
   total_frame_size += frame_size;
   if(frames_num%30 == 0)
   {
       printf("fps = %ld/n", (long)(frames_num*1000/(get_tick_count()-start_time)));
       printf("birtate = %ld/n", (long)(total_frame_size*1000/(get_tick_count()-start_time)));
       start_time = get_tick_count();
       frames_num = 0;
       total_frame_size = 0;
   }
}