uvg266/tests/check_cabac_state_consistency.py

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import sys
from pathlib import Path
from pprint import pprint
def get_ctx_count_and_names(cabac_source_file: Path):
count = 0
names = []
with open(cabac_source_file) as file:
for line in file:
line = line.strip().split(";")[0]
if line.startswith("cabac_ctx_t") and not "*" in line:
temp = 1
name = line.split()[1].split("[")[0]
for k in line.split("[")[1:]:
temp *= int(k[:-1])
count += temp
if temp == 1:
names.append(name)
else:
names.extend([f"{name}[{x}]" for x in range(temp)])
return count, names
def main(state_file: Path, ctx_names: list, ctx_count: int = 332, ctx_size: int = 6):
ctx_store = dict()
e_store = set()
was_zero_last = False
frame_num = -1
with open(state_file, "rb") as file:
try:
while True:
type_, x, y, depth = file.read(13).decode().split()
# Reset stored data at the beginning of the frame
if x == '0' and y == '0' and type_ == "S":
if not was_zero_last:
frame_num += 1
ctx_store = dict()
e_store = set()
was_zero_last = True
else:
was_zero_last = False
ctx = file.read(ctx_count * ctx_size)
if type_ == "S":
# These shouldn't happen but just to make sure everything is working as intended
if ctx_store.get((x, y, depth)):
raise RuntimeError
ctx_store[(x, y, depth)] = ctx
else:
if (x, y, depth) in e_store:
raise RuntimeError
e_store.add((x, y, depth))
if (s_ctx := ctx_store[(x, y, depth)]) != ctx:
actual_problem = False
for i in range(ctx_count):
temp_s = s_ctx[i * ctx_size: (i + 1) * ctx_size]
temp_e = ctx[i * ctx_size: (i + 1) * ctx_size]
if temp_s != temp_e:
if ctx_names[i] in ignore_list:
continue
actual_problem = True
print(f"MISSMATCH in {ctx_names[i]} {frame_num=} {x=} {y=} {depth=}")
print(
f"GOT : {int.from_bytes(temp_s[0:2], 'little')}:"
f"{int.from_bytes(temp_s[2:4], 'little')} "
f"rate={int.from_bytes(temp_s[4:5], 'big')}")
print(
f"EXPECTED: {int.from_bytes(temp_e[0:2], 'little')}:"
f"{int.from_bytes(temp_e[2:4], 'little')} "
f"rate={int.from_bytes(temp_e[4:5], 'big')}")
if actual_problem:
exit(1)
except ValueError:
# EOF
pass
if __name__ == '__main__':
ignore_list = {"sao_type_idx_model", "sao_merge_flag_model"}
if len(sys.argv) < 2:
print("Usage: name of the file storing the cabac states")
exit(1)
path = Path(__file__) / "../.." / "src" / "cabac.h"
print(path.resolve())
counts, names_ = get_ctx_count_and_names(path.resolve())
main(Path(sys.argv[1]), names_, counts)