From f96141033d2c9e935532d701d5cc7ca09397fb6f Mon Sep 17 00:00:00 2001
From: Herman Chen <herman.chen@rock-chips.com>
Date: Tue, 13 Jun 2017 09:18:02 +0800
Subject: [PATCH] [util]: Add frame checksum calculation function

Add checksum calculation function and file access function for debug.
NOTE: checksum for YUV image and for luma only so far.

Change-Id: I54509bebd64f5e5143e14824733d9c25af9db204
Signed-off-by: Herman Chen <herman.chen@rock-chips.com>
---
 utils/utils.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 utils/utils.h |  3 +++
 2 files changed, 47 insertions(+)

diff --git a/utils/utils.c b/utils/utils.c
index 573ae57a..96ae1b08 100644
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -74,3 +74,47 @@ void dump_mpp_frame_to_file(MppFrame frame, FILE *fp)
     }
 }
 
+void calc_frm_checksum(MppFrame frame, RK_U8 *sum)
+{
+    RK_U32 checksum = 0;
+    RK_U8 xor_mask;
+    RK_U32 y, x;
+
+    RK_U32 width  = mpp_frame_get_width(frame);
+    RK_U32 height = mpp_frame_get_height(frame);
+    RK_U32 stride = mpp_frame_get_hor_stride(frame);
+    RK_U8 *buf = (RK_U8 *)mpp_buffer_get_ptr(mpp_frame_get_buffer(frame));
+
+    for (y = 0; y < height; y++) {
+        for (x = 0; x < width; x++) {
+            xor_mask = (x & 0xff) ^ (y & 0xff) ^ (x >> 8) ^ (y >> 8);
+            checksum = (checksum + ((buf[y * stride + x] & 0xff) ^ xor_mask)) & 0xffffffff;
+        }
+    }
+
+    sum[0] = (checksum >> 24) & 0xff;
+    sum[1] = (checksum >> 16) & 0xff;
+    sum[2] = (checksum >> 8)  & 0xff;
+    sum[3] =  checksum      & 0xff;
+}
+
+void write_checksum(FILE *fp, RK_U8 *sum)
+{
+    RK_S32 i;
+
+    for (i = 0; i < 16; i++)
+        fprintf(fp, "%02hhx", sum[i]);
+
+    fprintf(fp, "\n");
+}
+
+void read_checksum(FILE *fp, RK_U8 *sum)
+{
+    RK_S32 i;
+
+    for (i = 0; i < 16; i++)
+        fscanf(fp, "%02hhx", sum + i);
+
+    fscanf(fp, "\n");
+}
+
diff --git a/utils/utils.h b/utils/utils.h
index 4f2a143f..10770a8a 100644
--- a/utils/utils.h
+++ b/utils/utils.h
@@ -37,6 +37,9 @@ extern "C" {
 
 void _show_options(int count, OptionInfo *options);
 void dump_mpp_frame_to_file(MppFrame frame, FILE *fp);
+void calc_frm_checksum(MppFrame frame, RK_U8 *sum);
+void write_checksum(FILE *fp, RK_U8 *sum);
+void read_checksum(FILE *fp, RK_U8 *sum);
 
 #ifdef __cplusplus
 }