310 lines
11 KiB
Python
310 lines
11 KiB
Python
#!/usr/bin/env python3
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"""
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Fixed Custom IR Protocol Decoder for Unknown Remote
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Based on signal analysis showing:
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- Most common: 71 pulses
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- Header: ~8843μs pulse + ~4507μs space
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- Bit pulse: ~484μs
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- Bit 0 space: ~645μs
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- Bit 1 space: ~1770μs
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"""
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import logging
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from typing import Dict, List, Optional, Tuple
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class IRProtocol:
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"""Base class for IR protocol decoding"""
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def __init__(self, name: str):
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self.name = name
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self.logger = logging.getLogger(f"{__name__}.{name}")
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def decode(self, pulses: List[Tuple[bool, float]]) -> Optional[str]:
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"""Decode IR pulses to command string"""
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raise NotImplementedError
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class CustomIRProtocol(IRProtocol):
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"""
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Custom IR Protocol Decoder for Unknown Remote
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Based on signal analysis showing:
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- Most common: 71 pulses
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- Header: ~8843μs pulse + ~4507μs space
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- Bit pulse: ~484μs
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- Bit 0 space: ~645μs
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- Bit 1 space: ~1770μs
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"""
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def __init__(self, name: str = "CUSTOM"):
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super().__init__(name)
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# Timing constants based on signal analysis
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# Header timing
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self.HEADER_PULSE = 8843 # microseconds (from analysis)
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self.HEADER_SPACE = 4507 # microseconds (from analysis)
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# Bit timing - this protocol uses space width modulation
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self.BIT_PULSE = 484 # microseconds (consistent pulse width)
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self.BIT_0_SPACE = 645 # microseconds (short space = bit 0)
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self.BIT_1_SPACE = 1770 # microseconds (long space = bit 1)
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# Repeat code timing (if supported)
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self.REPEAT_PULSE = 8843 # microseconds
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self.REPEAT_SPACE = 2093 # microseconds (from analysis)
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# Tolerance for timing matching
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self.TOLERANCE = 0.25 # 25% tolerance for this protocol
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# Expected frame structure
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self.EXPECTED_PULSE_COUNT = 71 # Most common pulse count
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self.DATA_BITS = 32 # Standard 32-bit data
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self.ADDRESS_BITS = 16 # 16-bit address
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self.COMMAND_BITS = 16 # 16-bit command
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# Footer timing (long gap before repeat)
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self.FOOTER_PULSE = 41949 # Very long pulse at end
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self.FOOTER_SPACE = 8997 # Space after footer
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def decode(self, pulses: List[Tuple[bool, float]]) -> Optional[str]:
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"""
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Decode IR pulses to command string
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Args:
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pulses: List of (is_pulse, duration) tuples
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is_pulse: True for pulse, False for space
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duration: Duration in seconds (will be converted to microseconds)
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Returns:
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Command string in format "CUSTOM_ADDRESS_COMMAND" or None if decode fails
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"""
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if len(pulses) < 2:
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return None
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# Convert durations to microseconds
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pulse_times = [duration * 1000000 for _, duration in pulses]
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# Check for repeat code first
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repeat_code = self._check_repeat_code(pulse_times)
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if repeat_code:
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return repeat_code
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# Check for normal frame
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if len(pulse_times) != self.EXPECTED_PULSE_COUNT:
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self.logger.debug(f"Expected {self.EXPECTED_PULSE_COUNT} pulses, got {len(pulse_times)}")
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return None
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# Decode the frame
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return self._decode_frame(pulse_times)
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def _check_repeat_code(self, pulse_times: List[float]) -> Optional[str]:
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"""Check if this is a repeat code"""
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if len(pulse_times) == 2:
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pulse_time = pulse_times[0]
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space_time = pulse_times[1]
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if (self._is_timing_match(pulse_time, self.REPEAT_PULSE) and
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self._is_timing_match(space_time, self.REPEAT_SPACE)):
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return "REPEAT"
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return None
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def _decode_frame(self, pulse_times: List[float]) -> Optional[str]:
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"""Decode a complete frame"""
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# Check header (first two timings)
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if not self._check_header(pulse_times[:2]):
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return None
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# Find where the data ends (look for the footer)
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data_end = self._find_data_end(pulse_times[2:])
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if data_end is None:
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return None
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# Decode data bits (skip the footer)
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data_pulses = pulse_times[2:2+data_end]
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address, command = self._decode_data_bits(data_pulses)
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if address is None or command is None:
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return None
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return f"CUSTOM_{address:04X}_{command:04X}"
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def _check_header(self, header_times: List[float]) -> bool:
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"""Check if the header matches expected timing"""
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if len(header_times) < 2:
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return False
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pulse_time = header_times[0]
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space_time = header_times[1]
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return (self._is_timing_match(pulse_time, self.HEADER_PULSE) and
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self._is_timing_match(space_time, self.HEADER_SPACE))
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def _find_data_end(self, data_times: List[float]) -> Optional[int]:
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"""Find where the data section ends by looking for the footer"""
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# Look for the very long pulse that indicates end of data
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for i in range(0, len(data_times), 2):
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if i < len(data_times):
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pulse_time = data_times[i]
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# Check if this is the footer pulse (very long)
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if self._is_timing_match(pulse_time, self.FOOTER_PULSE):
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return i # Return the index where data ends
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# If no footer found, assume it's a standard 32-bit protocol
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return 64 # 32 bits * 2 (pulse + space)
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def _decode_data_bits(self, data_times: List[float]) -> Tuple[Optional[int], Optional[int]]:
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"""Decode data bits from timing data"""
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if len(data_times) < self.DATA_BITS * 2:
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print(f"Not enough data: {len(data_times)} < {self.DATA_BITS * 2}")
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return None, None
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address = 0
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command = 0
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# Process data bits in pairs (pulse, space)
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for i in range(0, min(len(data_times), self.DATA_BITS * 2), 2):
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if i + 1 >= len(data_times):
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print(f"Not enough data at bit {i//2}")
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break
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pulse_time = data_times[i]
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space_time = data_times[i + 1]
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# Check if pulse timing is valid (should be ~484μs)
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if not self._is_timing_match(pulse_time, self.BIT_PULSE):
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print(f"Invalid pulse timing at bit {i//2}: {pulse_time}μs (expected ~{self.BIT_PULSE}μs)")
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return None, None
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bit_index = i // 2
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bit_value = self._decode_bit(space_time)
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if bit_value is None:
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print(f"Invalid space timing at bit {bit_index}: {space_time}μs (expected ~{self.BIT_0_SPACE}μs or ~{self.BIT_1_SPACE}μs)")
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return None, None
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# Set the bit in the appropriate field
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if bit_index < self.ADDRESS_BITS:
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if bit_value:
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address |= (1 << bit_index)
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else:
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command_bit_index = bit_index - self.ADDRESS_BITS
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if bit_value:
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command |= (1 << command_bit_index)
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return address, command
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def _decode_bit(self, space_time: float) -> Optional[bool]:
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"""Decode a single bit from space timing"""
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if self._is_timing_match(space_time, self.BIT_1_SPACE):
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return True
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elif self._is_timing_match(space_time, self.BIT_0_SPACE):
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return False
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else:
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return None
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def _is_timing_match(self, actual: float, expected: float) -> bool:
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"""Check if actual timing matches expected timing within tolerance"""
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min_time = expected * (1 - self.TOLERANCE)
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max_time = expected * (1 + self.TOLERANCE)
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return min_time <= actual <= max_time
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# New method to decode from raw timing data (not pulse/space pairs)
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def decode_from_raw_timings(raw_timings: List[float]) -> Optional[str]:
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"""
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Decode from raw timing data by determining pulse/space sequence
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Args:
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raw_timings: List of timing values in microseconds
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Returns:
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Command string or None if decode fails
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"""
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if len(raw_timings) < 2:
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return None
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# Create protocol instance
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protocol = CustomIRProtocol("RAW_CUSTOM")
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# Check for repeat code first
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if len(raw_timings) == 2:
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pulse_time = raw_timings[0]
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space_time = raw_timings[1]
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if (protocol._is_timing_match(pulse_time, protocol.REPEAT_PULSE) and
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protocol._is_timing_match(space_time, protocol.REPEAT_SPACE)):
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return "REPEAT"
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# Check for normal frame
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if len(raw_timings) != protocol.EXPECTED_PULSE_COUNT:
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return None
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# Check header
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if not protocol._check_header(raw_timings[:2]):
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return None
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# Find where the data ends
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data_end = protocol._find_data_end(raw_timings[2:])
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if data_end is None:
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return None
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# Decode data bits
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data_pulses = raw_timings[2:2+data_end]
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address, command = protocol._decode_data_bits(data_pulses)
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if address is None or command is None:
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return None
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return f"CUSTOM_{address:04X}_{command:04X}"
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# Example usage and testing
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if __name__ == "__main__":
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import json
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# Setup logging
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logging.basicConfig(level=logging.DEBUG)
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# Test with captured signals
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try:
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with open("ir_analysis_20250927_190536.json", 'r') as f:
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signals = json.load(f)
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print("Testing custom protocol decoder with raw timing data...")
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successful_decodes = 0
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failed_decodes = 0
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decoded_commands = {}
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for i, signal_data in enumerate(signals):
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pulse_count = signal_data['pulse_count']
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raw_timings = signal_data['pulses'] # Already in microseconds
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# Try to decode using raw timings
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command = decode_from_raw_timings(raw_timings)
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if command:
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successful_decodes += 1
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if command not in decoded_commands:
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decoded_commands[command] = 0
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decoded_commands[command] += 1
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print(f"Signal {i+1:2d} ({pulse_count:2d} pulses): {command}")
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else:
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failed_decodes += 1
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if pulse_count == 71: # Only show failed 71-pulse signals
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print(f"Signal {i+1:2d} ({pulse_count:2d} pulses): FAILED TO DECODE")
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print(f"\nSuccessful decodes: {successful_decodes}")
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print(f"Failed decodes: {failed_decodes}")
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print(f"Success rate: {successful_decodes/(successful_decodes+failed_decodes)*100:.1f}%")
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if decoded_commands:
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print("\nDecoded commands:")
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for command, count in sorted(decoded_commands.items()):
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print(f" {command}: {count} occurrences")
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except FileNotFoundError:
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print("No analysis file found. Run ir_signal_analyzer.py first to capture signals.")
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except Exception as e:
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print(f"Error: {e}")
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