feat(jpeg): Add jpeg decoder example for esp32p4

examples/peripherals/jpeg/jpeg_decode/open_rgb.py

@@ -0,0 +1,91 @@
+# SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+import argparse
+
+import cv2 as cv
+import numpy as np
+
+
+def open_picture(path):  # type: (str) -> list[int]
+    with open(path, 'rb') as f:
+        data = f.read()
+        f.close()
+    new_data = [int(x) for x in data]
+    return new_data
+
+
+def picture_show_rgb888(data, h, w):  # type: (list[int], int, int) -> None
+    data = np.array(data).reshape(h, w, 3).astype(np.uint8)
+    cv.imshow('data', data)
+    cv.waitKey()
+
+
+def picture_show_rgb565(data, h, w):  # type: (list[int], int, int) -> None
+
+    new_data = [0] * ((len(data) // 2) * 3)
+    for i in range(len(data)):
+        if i % 2 != 0:
+            new_data[3 * (i - 1) // 2 + 2] = (data[i] & 0xf8)
+            new_data[3 * (i - 1) // 2 + 1] |= (data[i] & 0x7) << 5
+        else:
+            new_data[3 * i // 2] = (data[i] & 0x1f) << 3
+            new_data[3 * i // 2 + 1] |= (data[i] & 0xe0) >> 3
+
+    new_data = np.array(new_data).reshape(h, w, 3).astype(np.uint8)
+    cv.imshow('data', new_data)
+    cv.waitKey()
+
+
+def picture_show_gray(data, h, w):  # type: (list[int], int, int) -> None
+    new_data = np.array(data).reshape(h, w, 1).astype(np.uint8)
+    cv.imshow('data', new_data)
+    cv.waitKey()
+
+
+def main():  # type: () -> None
+    parser = argparse.ArgumentParser(description='which mode need to show')
+
+    parser.add_argument(
+        '--pic_path',
+        type=str,
+        help='What is the path of your picture',
+        required=True)
+
+    parser.add_argument(
+        '--pic_type',
+        type=str,
+        help='What type you want to show',
+        required=True,
+        choices=['rgb565', 'rgb888', 'gray'])
+
+    parser.add_argument(
+        '--hight',
+        type=int,
+        help='the picture hight',
+        default=480)
+
+    parser.add_argument(
+        '--width',
+        type=int,
+        help='the picture width',
+        default=640)
+
+    args = parser.parse_args()
+
+    hight = args.hight
+    width = args.width
+
+    data = open_picture(args.pic_path)
+
+    if (args.pic_type == 'rgb565'):
+        picture_show_rgb565(data, hight, width)
+    elif (args.pic_type == 'rgb888'):
+        picture_show_rgb888(data, hight, width)
+    elif (args.pic_type == 'gray'):
+        picture_show_gray(data, hight, width)
+    else:
+        print('This type is not supported in this script!')
+
+
+if __name__ == '__main__':
+    main()