## 🛰️ Architecture & Code for DVB Channel List Platform ### 1. System Architecture (High-Level) ``` ┌──────────────────────────┐ │ Cloud Load Balancer │ ├──────────────────────────┤ │ Next.js (Frontend/API) │ │ + Arabic UI (RTL) │ ├──────────────────────────┤ │ AI Filtering Service │ │ (Python FastAPI) │ ├──────────────────────────┤ │ Format Converter Engine │ │ (Node.js + C++ addon) │ ├──────────────────────────┤ │ Scraper / API Fetcher │ │ (Celery + Redis Queue) │ ├──────────────────────────┤ │ PostgreSQL / Redis │ │ (Cached channel DB) │ └──────────────────────────┘ ``` - **Scraper**: Scheduled tasks (every 6h) fetch fresh transponder data from FlySat/LyngSat. - **AI Filter**: Markov model + community reports → removes dead channels. - **Converter**: Binary serializer per chipset (Sunplus `.abs`, GX `.bin`, ALi `.sdx`). - **API**: REST endpoints for categories, device types, and file generation. --- ### 2. Python Code – Frequency Processing & Converter (Sunplus .abs) ```python import struct import hashlib # ---------------------------------------------------------------------- # 1. Normalize raw scraper data # ---------------------------------------------------------------------- def normalize_channel(raw): """Convert scraper dict to standard internal format.""" return { "name": raw.get("name", "").strip(), "frequency": int(raw.get("frequency", 0)), # MHz "symbol_rate": int(raw.get("symbol_rate", 0)), # kS/s "polarization": raw.get("polarization", "V").upper(), # V/H "fec": raw.get("fec", "3/4"), "modulation": raw.get("modulation", "QPSK"), "satellite": raw.get("satellite", "Nilesat 102"), } # ---------------------------------------------------------------------- # 2. Filter dead channels using community reports (mock) # ---------------------------------------------------------------------- DEAD_REPORT_HASH = set() # Loaded from blockchain/crowdsourced database def is_alive(channel_key): return channel_key not in DEAD_REPORT_HASH # ---------------------------------------------------------------------- # 3. Generate Sunplus .abs binary # ---------------------------------------------------------------------- def build_abs_channel_block(ch): """ Sunplus .abs format: each channel record is 64 bytes. Offset 0-31: channel name (UTF-16LE?) Offset 32: frequency LSB... Detailed spec from OpenDVB forums. """ block = bytearray(64) # Name (max 31 chars, zero-padded) name = ch['name'][:31].encode('utf-8') block[0:len(name)] = name # Frequency in Hz, 4 bytes little-endian freq_hz = ch['frequency'] * 1000000 # MHz -> Hz struct.pack_into(' S/s struct.pack_into('` – fixed per session. Would you like me to elaborate on any specific converter (ALi `.sdx`, Android TV `.xml`) or the AI filtering algorithm?