davinci encoder: add fps measurements for debugging (remove later when done)

modules/codec/davinci/encoder.c

@@ -69,6 +69,12 @@ struct encoder_sys_t
 
     XDM_BufDesc in;
     XDM_BufDesc out;
+
+    /* stats */
+    mtime_t i_pts_start;
+    mtime_t i_pts_end;
+    int     i_fps;
+    int     i_pics;
 };
 
 /*****************************************************************************
@@ -195,6 +201,7 @@ static int GetVideoEncoderSettings( encoder_t *p_enc, const char *psz_codec )
     p_enc->i_iframes = var_CreateGetInteger( p_enc, ENC_CFG_PREFIX "keyint" );
     p_enc->i_tolerance = var_CreateGetInteger( p_enc, ENC_CFG_PREFIX "tolerance" );
     p_enc->i_tolerance *= 1024; /* bits per second */
+    p_sys->i_fps = 25;
 
     /* Configure encoder */
     params.size = sizeof( params );
@@ -260,6 +267,34 @@ static int GetVideoEncoderSettings( encoder_t *p_enc, const char *psz_codec )
     return VLC_SUCCESS;
 }
 
+static inline void calculate_fps( encoder_t *p_enc )
+{
+    encoder_sys_t *p_sys = p_enc->p_sys;
+
+    p_sys->i_pics++;
+    if( p_sys->i_pics == 1 )
+    {
+        p_sys->i_pts_start = mdate();
+    }
+
+    if( p_sys->i_pics == p_sys->i_fps )
+    {
+        mtime_t i_diff; /* in us */
+        double f_fps;
+
+        p_sys->i_pts_end = mdate(); /* in us */
+        i_diff = (p_sys->i_pts_end - p_sys->i_pts_start);
+        f_fps = (double)((i_diff / (int64_t)p_sys->i_pics)); /* 1 frame per us */
+        f_fps = ((double)1/f_fps) * (double)1000000;
+        msg_Info( p_enc, "%d frames per %"PRId64" micro seconds (%4.2f fps)",
+                  p_sys->i_pics, i_diff, f_fps );
+
+        /* reset timers */
+        p_sys->i_pics = 0;
+        p_sys->i_pts_start = p_sys->i_pts_end = (mtime_t)0;
+    }
+}
+
 static inline void davinci_CopyPictureToXDM( encoder_t *p_enc, XDM_BufDesc *p_buf, picture_t *p_pic )
 {
     VLC_UNUSED( p_enc );
@@ -383,6 +418,7 @@ static block_t *EncodeVideo( encoder_t *p_enc, picture_t *p_pic )
 
     /* Print some info */
     //msg_Dbg( p_enc, "Bytes generated: %d", (int)out_args.bytesGenerated );
+    calculate_fps( p_enc );
 
     /* Put everything in the block */
     if( out_args.bytesGenerated <= 0 )