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更新 HEIC 文件处理逻辑，修复 ID 映射并优化属性关联处理

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Nymiro
2025-10-20 22:07:29 +13:00
parent c0c159a7cc
commit b3f0fd4ce3
14 changed files with 117 additions and 56 deletions
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heic_file.py
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@@ -163,7 +163,10 @@ class HEICFile:
return
# 4a. 找到要删除的属性索引 (1-based)
props_to_remove = set(ipma.entries[item_id_to_remove].associations)
props_to_remove = {
assoc.property_index
for assoc in ipma.entries[item_id_to_remove].associations
}
# 4b. 从 ipma 中删除该 Item
del ipma.entries[item_id_to_remove]
@@ -173,7 +176,9 @@ class HEICFile:
# (即，它们在 props_to_remove 中，但*不在*任何*剩余*的 item 关联中)
all_remaining_props = set()
for entry in ipma.entries.values():
all_remaining_props.update(entry.associations)
all_remaining_props.update(
assoc.property_index for assoc in entry.associations
)
orphaned_props = props_to_remove - all_remaining_props
@@ -218,9 +223,11 @@ class HEICFile:
# 4g. 应用重映射
for item_id, entry in ipma.entries.items():
new_associations = []
for old_prop_index in entry.associations:
for assoc in entry.associations:
old_prop_index = assoc.property_index
if old_prop_index in remap_table:
new_associations.append(remap_table[old_prop_index])
assoc.property_index = remap_table[old_prop_index]
new_associations.append(assoc)
# else:
# 该属性已被删除 (不应发生，因为我们只删除了孤儿)
@@ -351,7 +358,7 @@ class HEICFile:
item_associations = self._iprp_box.ipma.entries[target_id].associations
for assoc in item_associations:
property_index = assoc - 1
property_index = assoc.property_index - 1
if 0 <= property_index < len(self._iprp_box.ipco.children):
prop = self._iprp_box.ipco.children[property_index]
if isinstance(prop, ImageSpatialExtentsBox):
heic_types.py
+97 -37
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@@ -30,6 +30,11 @@ def _write_int(value: int, size: int) -> bytes:
class ItemLocation:
def __init__(self, item_id):
self.item_id = item_id
self.data_reference_index = 0
self.base_offset = 0
self.construction_method = 0
self.extent_indices = []
self.raw_extents = [] # (relative_offset, length)
# extents 存储 (absolute_offset, length)
self.extents = []
@@ -81,9 +86,11 @@ class ItemLocationBox(FullBox):
loc = ItemLocation(item_id)
if (self.version == 1 or self.version == 2) and current_pos + 2 <= len(stream):
loc.construction_method = struct.unpack('>H', stream[current_pos:current_pos+2])[0]
current_pos += 2
if current_pos + 2 > len(stream): break
loc.data_reference_index = struct.unpack('>H', stream[current_pos:current_pos+2])[0]
current_pos += 2
base_offset = 0
@@ -91,6 +98,7 @@ class ItemLocationBox(FullBox):
if current_pos + self.base_offset_size > len(stream): break
base_offset = _read_int(stream, current_pos, self.base_offset_size)
current_pos += self.base_offset_size
loc.base_offset = base_offset
if current_pos + 2 > len(stream): break
extent_count = struct.unpack('>H', stream[current_pos : current_pos+2])[0]
@@ -99,6 +107,7 @@ class ItemLocationBox(FullBox):
for __ in range(extent_count):
if (self.version == 1 or self.version == 2) and self.index_size > 0:
if current_pos + self.index_size > len(stream): break
loc.extent_indices.append(_read_int(stream, current_pos, self.index_size))
current_pos += self.index_size
if current_pos + self.offset_size > len(stream): break
@@ -109,6 +118,7 @@ class ItemLocationBox(FullBox):
extent_length = _read_int(stream, current_pos, self.length_size)
current_pos += self.length_size
loc.raw_extents.append((extent_offset, extent_length))
loc.extents.append((base_offset + extent_offset, extent_length))
self.locations.append(loc)
@@ -134,59 +144,82 @@ class ItemLocationBox(FullBox):
else:
content_stream.write(struct.pack('>I', len(self.locations)))
original_mdat_end_offset = original_mdat_offset + original_mdat_size
original_meta_end_offset = original_meta_offset + original_meta_size
def _adjust_absolute_offset(original_offset: int) -> int:
if original_offset == 0:
return 0
if original_mdat_offset <= original_offset < original_mdat_end_offset:
return original_offset + mdat_offset_delta
if original_meta_offset <= original_offset < original_meta_end_offset:
return original_offset + meta_offset_delta
return original_offset
for loc in self.locations:
item_id_size = 2 if self.version < 2 else 4
content_stream.write(_write_int(loc.item_id, item_id_size))
if (self.version == 1 or self.version == 2):
content_stream.write(struct.pack('>H', 0))
content_stream.write(struct.pack('>H', loc.construction_method & 0xFFFF))
content_stream.write(struct.pack('>H', 0))
content_stream.write(struct.pack('>H', loc.data_reference_index))
if self.base_offset_size > 0:
content_stream.write(_write_int(0, self.base_offset_size))
new_base_offset = _adjust_absolute_offset(loc.base_offset)
content_stream.write(_write_int(new_base_offset, self.base_offset_size))
else:
new_base_offset = 0
content_stream.write(struct.pack('>H', len(loc.extents)))
extents_to_process = loc.raw_extents if loc.raw_extents else [
(max(absolute_offset - loc.base_offset, 0), length)
for absolute_offset, length in loc.extents
]
content_stream.write(struct.pack('>H', len(extents_to_process)))
for (original_offset, length) in loc.extents:
new_extents_absolute = []
new_extents_relative = []
new_extent_indices = []
for idx, (original_relative_offset, length) in enumerate(extents_to_process):
if (self.version == 1 or self.version == 2) and self.index_size > 0:
content_stream.write(_write_int(0, self.index_size))
extent_index = loc.extent_indices[idx] if idx < len(loc.extent_indices) else 0
content_stream.write(_write_int(extent_index, self.index_size))
new_extent_indices.append(extent_index)
# !!! 魔法发生的地方 !!!
new_absolute_offset = original_offset
original_mdat_end_offset = original_mdat_offset + original_mdat_size
original_meta_end_offset = original_meta_offset + original_meta_size
original_absolute_offset = loc.base_offset + original_relative_offset
new_absolute_offset = _adjust_absolute_offset(original_absolute_offset)
if original_offset == 0:
if original_absolute_offset == 0:
new_absolute_offset = 0 # 保持 0 偏移量
# 检查偏移量是否落在 *原始* mdat 盒区域内
elif (original_mdat_offset <= original_offset < original_mdat_end_offset):
# 这是一个指向 mdat 的偏移量，应用 mdat 增量
new_absolute_offset = original_offset + mdat_offset_delta
# pyheic_struct_副本/heic_types.py
# 检查偏移量是否落在 *原始* meta 盒区域内
elif (original_meta_offset <= original_offset < original_meta_end_offset):
# 这是一个指向 meta 内部的偏移量 (例如 EXIF)
# (*** 错误修正 ***)
# 它只应该被 *meta 盒之前* 的数据增长所平移。
# 在我们的 builder.py 逻辑中, 'meta_offset_delta' 正是这个值 (即 ftyp 盒的增长)。
new_absolute_offset = original_offset + meta_offset_delta
# else:
# 这是一个指向其他地方 (如 ftyp) 的偏移量，我们假设它不动
# new_absolute_offset 保持等于 original_offset
# 最后的安全检查，防止打包负数
if new_absolute_offset < 0:
print(f" Warning: Calculated a negative offset ({new_absolute_offset}) for item {loc.item_id}. Setting to 0.")
new_absolute_offset = 0
content_stream.write(_write_int(new_absolute_offset, self.offset_size))
if self.base_offset_size > 0:
new_relative_offset = new_absolute_offset - new_base_offset
else:
new_relative_offset = new_absolute_offset
if new_relative_offset < 0:
print(f" Warning: Calculated a negative relative offset ({new_relative_offset}) for item {loc.item_id}. Setting to 0.")
new_relative_offset = 0
new_absolute_offset = new_base_offset
content_stream.write(_write_int(new_relative_offset, self.offset_size))
content_stream.write(_write_int(length, self.length_size))
new_extents_absolute.append((new_absolute_offset, length))
new_extents_relative.append((new_relative_offset, length))
loc.base_offset = new_base_offset
loc.extents = new_extents_absolute
loc.raw_extents = new_extents_relative
if new_extent_indices:
loc.extent_indices = new_extent_indices
self.raw_data = content_stream.getvalue()
print(" 'iloc' box content successfully rebuilt.")
# --- END FIX ---
@@ -214,6 +247,7 @@ class ItemInfoEntryBox(FullBox):
self.item_name: str = "" # UTF-8 string
self.content_type: Optional[str] = None
self.content_encoding: Optional[str] = None
self._has_protection_field: bool = True
super().__init__(size, box_type, offset, raw_data)
def _post_parse_initialization(self):
@@ -250,6 +284,7 @@ class ItemInfoEntryBox(FullBox):
pos += 4
remaining = len(stream) - pos
self._has_protection_field = False
if remaining >= 6:
candidate_protection = struct.unpack('>H', stream[pos:pos+2])[0]
candidate_type = stream[pos+2:pos+6]
@@ -257,17 +292,20 @@ class ItemInfoEntryBox(FullBox):
if candidate_protection <= 0x00FF and b'\x00' not in candidate_type:
# 标准顺序: 2 字节保护索引 + 4 字节类型
self.item_protection_index = candidate_protection
self._has_protection_field = True
pos += 2
type_bytes = candidate_type
pos += 4
else:
# 三星文件: 直接写入类型 (如 'hvc1')，缺少保护索引
self.item_protection_index = 0
self._has_protection_field = False
type_bytes = stream[pos:pos+4]
pos += 4
elif remaining >= 4:
# 某些三星文件缺少 2 字节的保护索引字段, 直接紧跟 4 字节类型
self.item_protection_index = 0
self._has_protection_field = False
type_bytes = stream[pos:pos+4]
pos += 4
else:
@@ -336,7 +374,8 @@ class ItemInfoEntryBox(FullBox):
elif self.version == 2:
content.write(struct.pack('>I', self.item_id))
content.write(struct.pack('>H', self.item_protection_index))
if self._has_protection_field:
content.write(struct.pack('>H', self.item_protection_index))
# item_type 必须是 4 字节的 4CC，若不足则以 NUL 填充
content.write(self.item_type.encode('ascii', errors='ignore')[:4].ljust(4, b'\x00'))
content.write(item_name_bytes_to_write)
@@ -458,13 +497,25 @@ class ImageSpatialExtentsBox(FullBox):
return content.getvalue()
# --- ItemPropertyAssociationEntry (DataClass) ---
class ItemPropertyAssociation:
def __init__(self, property_index: int, essential: bool):
self.property_index = property_index
self.essential = essential
def __repr__(self):
flag = '!' if self.essential else ''
return f"{flag}{self.property_index}"
class ItemPropertyAssociationEntry:
def __init__(self, item_id, association_count):
self.item_id = item_id
self.association_count = association_count
self.associations = []
self.associations: List[ItemPropertyAssociation] = []
def __repr__(self):
return f"<ItemPropertyAssociationEntry item_id={self.item_id} associations={self.associations}>"
return (f"<ItemPropertyAssociationEntry item_id={self.item_id} "
f"associations={[repr(a) for a in self.associations]}>")
# --- ItemPropertyAssociationBox ---
# ('ipma')
@@ -500,10 +551,14 @@ class ItemPropertyAssociationBox(FullBox):
prop_size = 2 if is_large_property_index else 1
if pos + prop_size > len(stream): break
assoc_value = _read_int(stream, pos, prop_size)
essential_flag = 0x8000 if prop_size == 2 else 0x80
property_index = assoc_value & (0x7FFF if prop_size == 2 else 0x7F)
is_essential = (assoc_value & essential_flag) != 0
pos += prop_size
if property_index > 0:
entry.associations.append(property_index)
entry.associations.append(
ItemPropertyAssociation(property_index, is_essential)
)
self.entries[item_id] = entry
except struct.error:
print("Warning: Failed to parse 'ipma' box. Content may be truncated.")
@@ -521,9 +576,14 @@ class ItemPropertyAssociationBox(FullBox):
content.write(_write_int(item_id, item_id_size))
content.write(struct.pack('>B', len(entry.associations)))
for assoc_index in entry.associations:
for assoc in entry.associations:
prop_size = 2 if is_large_property_index else 1
content.write(_write_int(assoc_index, prop_size))
mask = 0x7FFF if prop_size == 2 else 0x7F
essential_flag = 0x8000 if prop_size == 2 else 0x80
assoc_value = assoc.property_index & mask
if assoc.essential:
assoc_value |= essential_flag
content.write(_write_int(assoc_value, prop_size))
return content.getvalue()
main.py
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@@ -132,19 +132,13 @@ def convert_samsung_to_apple(samsung_file_path: str):
shifted_id_map = {}
if iinf_children_to_fix:
print(f" Found {len(iinf_children_to_fix)} shifted 'infe' boxes. Fixing them...")
print(f" Found {len(iinf_children_to_fix)} shifted 'infe' boxes. Mapping IDs for reference...")
for infe_box in iinf_children_to_fix:
unshifted_id = infe_box.item_id >> 16
# 检查 unshifted_id 是否真的在 correct_ids 中，以防万一
if unshifted_id in correct_ids:
shifted_id_map[infe_box.item_id] = unshifted_id # 存映射
print(f" - Fixing 'infe' ID {infe_box.item_id} -> {unshifted_id}")
infe_box.item_id = unshifted_id
# 同时修复 iinf_box.entries 中的缓存
for entry in flat_heic_file._iinf_box.entries:
if entry.item_id in shifted_id_map:
entry.item_id = shifted_id_map[entry.item_id]
print(f" - Mapping 'infe' ID {infe_box.item_id} -> {unshifted_id}")
else:
print(" 'infe' boxes seem correct. No shift detected.")
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