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decode.py

@@ -1,4 +1,6 @@
-from os import system
+import argparse
+import os
+import subprocess
 import numpy as np
 from tqdm import tqdm
 import pandas as pd
@@ -6,10 +8,24 @@ import pcapng
 from struct import unpack
 from PIL import Image
 
-# Read packets from a pcap file
-scanner = pcapng.scanner.FileScanner(open('in.pcap', 'rb'))
-blocks = list(tqdm(scanner))
 
+# Create the parser
+parser = argparse.ArgumentParser(description="Process a pcap file.")
+
+# Add an argument for the pcap file, with a default value
+parser.add_argument('input_file', nargs='?', default='in.pcap', help='The pcap file to process')
+
+# Parse the arguments
+args = parser.parse_args()
+
+# Now use args.input_file as the file to process
+input_file = args.input_file
+basename = os.path.splitext(os.path.basename(input_file))[0]
+
+
+# Read packets from a pcap file
+scanner = pcapng.scanner.FileScanner(open(input_file, "rb"))
+blocks = list(tqdm(scanner))
 
 # Helper function to safely get an attribute from an object
 def tryget(obj, att):
@@ -19,31 +35,33 @@ def tryget(obj, att):
 
 
 # Create a DataFrame with packet lengths
-df = pd.DataFrame([{'index': i, 'length': tryget(obj, 'packet_len')} for i, obj in enumerate(blocks)])
+df = pd.DataFrame(
+    [{"index": i, "length": tryget(obj, "packet_len")} for i, obj in enumerate(blocks)]
+)
 
 
 # Filter and extract data packets of a specific length
 data = [blocks[i] for i in df[df.length == 6972.0].index]
 
 # Remove the UDP header from the packets
-raw = [d.packet_data[0x2a:] for d in data]
+raw = [d.packet_data[0x2A:] for d in data]
 
 
 # Function to parse packet data
 def parse(data):
     hdr = 4 + 2 * 7  # Header length
     # Unpack data into variables
-    c1, c2, part, a, ffaa, b, c, d = unpack('>Lhhhhhhh', data[:hdr])
+    c1, c2, part, a, ffaa, b, c, d = unpack(">Lhhhhhhh", data[:hdr])
     ret = locals()
-    del ret['data']
-    del ret['hdr']
-    ret['data'] = data[hdr:]
+    del ret["data"]
+    del ret["hdr"]
+    ret["data"] = data[hdr:]
     return ret
 
 
 # Parse each packet and create a DataFrame
 df = pd.DataFrame([parse(d) for d in raw])
-df2 = df[[c for c in df.columns if c != 'data']]
+df2 = df[[c for c in df.columns if c != "data"]]
 
 
 # Function to group data into frames
@@ -55,16 +73,17 @@ def getframes(df):
             if len(current) > 0:
                 frames.append(current)
             current = []
-        current.append(row['data'])
+        current.append(row["data"])
     if len(current) > 0:
         frames.append(current)
-    return [b''.join(parts) for parts in frames]
+    return [b"".join(parts) for parts in frames]
 
 
 # Function to convert binary frame data into images
-def image16(frame, width, height, pixelformat='>H'):
+def image16(frame, width, height, pixelformat=">H"):
     return [
-        Image.fromarray(np.frombuffer(frame, dtype=pixelformat).reshape(width, height)) for frame in frames
+        Image.fromarray(np.frombuffer(frame, dtype=pixelformat).reshape(width, height))
+        for frame in frames
         if len(frame) == 2 * width * height
     ]
 
@@ -73,10 +92,32 @@ def image16(frame, width, height, pixelformat='>H'):
 frames = getframes(df)
 images = image16(frames, 384, 288)
 
+# Create the directory for frames if not exists
+frame_dir = f"frames/{basename}"
+if not os.path.exists(frame_dir):
+    os.makedirs(frame_dir)
+
 # Save each image as a PNG file
 for i, img in enumerate(tqdm(images)):
-    img.save(f'{i:04}.png')
+    img.save(f'frames/{basename}/{basename}_{i:04}.png')
 
 # Produce a video from the saved images
-system('ffmpeg -hide_banner -loglevel info -y -f image2 -framerate 25 -i %04d.png -vf "transpose=1" -s 384x288 -vcodec libx264 -pix_fmt yuv420p thermal.mp4')
-print('to play: ffplay thermal.mp4')
+ffmpeg_input = f"frames/{basename}/{basename}_%04d.png"
+command = [
+    "ffmpeg", 
+    "-y",                  # Overwrite output file without asking
+    "-hide_banner",        # Hide banner
+    "-loglevel", "info",   # Log level
+    "-f", "image2",        # Input format
+    "-framerate", "25",    # Framerate
+    "-i", ffmpeg_input,     # Input file pattern
+    "-vf", "transpose=1",  # Video filter for transposing
+    "-s", "384x288",       # Size of one frame
+    "-vcodec", "libx264",  # Video codec
+    "-pix_fmt", "yuv420p", # Pixel format: YUV 4:2:0
+    "thermal.mp4",         # Output file in MP4 container
+]
+
+subprocess.run(command)
+
+print("to play: ffplay thermal.mp4")