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File size: 2,254 Bytes
20857b0 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | import struct
import zlib
from mediatok.container.gtkv import ENTROPY_CODEC_ID_MAP
from mediatok.entropy.pack import pack_tokens, unpack_tokens
ZSTD_LEVEL = 3
def entropy_encode(tokens: list[int], codec_id: int, bits: int = 32) -> bytes:
if codec_id == 0:
return _raw_encode(tokens, bits)
elif codec_id == 1:
from .rans import rans_encode
return rans_encode(tokens)
elif codec_id == 2:
raw = _raw_encode(tokens, bits)
return zlib.compress(raw, level=ZSTD_LEVEL)
elif codec_id == 3:
raw = _raw_encode(tokens, bits)
return zlib.compress(raw, level=ZSTD_LEVEL)
elif codec_id == 4:
from .ans import ans_encode
return ans_encode(tokens)
raise ValueError(f"unknown codec: {codec_id}")
def entropy_decode(payload: bytes, codec_id: int, expected_count: int, bits: int = 32) -> list[int]:
if codec_id == 0:
return _raw_decode(payload, expected_count, bits)
elif codec_id == 1:
from .rans import rans_decode
return rans_decode(payload)
elif codec_id == 2:
raw = zlib.decompress(payload)
return _raw_decode(raw, expected_count, bits)
elif codec_id == 3:
raw = zlib.decompress(payload)
return _raw_decode(raw, expected_count, bits)
elif codec_id == 4:
from .ans import ans_decode
return ans_decode(payload)
raise ValueError(f"unknown codec: {codec_id}")
def _raw_encode(tokens: list[int], bits: int = 32) -> bytes:
if bits == 18:
return bytes(pack_tokens(tokens, 18))
data = bytearray()
for t in tokens:
while t >= 128:
data.append((t & 127) | 128)
t >>= 7
data.append(t)
return bytes(data)
def _raw_decode(data: bytes, expected_count: int, bits: int = 32) -> list[int]:
if bits == 18:
return unpack_tokens(list(data), expected_count, 18)
tokens = []
i = 0
while len(tokens) < expected_count and i < len(data):
val = 0
shift = 0
while i < len(data):
b = data[i]
i += 1
val |= (b & 127) << shift
shift += 7
if not (b & 128):
break
tokens.append(val)
return tokens
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