From 6b02d73600a517fa98d9f44eba558487ae96f7ea Mon Sep 17 00:00:00 2001
From: minjaesong <alswo9628@gmail.com>
Date: Sat, 9 May 2026 00:57:55 +0900
Subject: [PATCH] 2taud.py: project data composing

---
 it2taud.py     | 49 +++++++++++++++++++++------
 mod2taud.py    | 43 ++++++++++++++++++------
 mon2taud.py    | 45 +++++++++++++++++--------
 s3m2taud.py    | 48 ++++++++++++++++++++-------
 taud_common.py | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++
 xm2taud.py     | 50 ++++++++++++++++++++++------
 6 files changed, 267 insertions(+), 58 deletions(-)

diff --git a/it2taud.py b/it2taud.py
index c355d29..d40c421 100644
--- a/it2taud.py
+++ b/it2taud.py
@@ -55,6 +55,7 @@ from taud_common import (
     encode_cue, deduplicate_patterns,
     normalise_sample, encode_song_entry, nearest_minifloat, compress_blob,
     CUE_INST_NOP, CUE_INST_HALT, CUE_INST_LEN, cue_instruction_len,
+    build_project_data,
 )
 
 
@@ -1561,7 +1562,8 @@ def _active_channels(h: ITHeader, patterns_rows: list) -> list:
     return active
 
 def assemble_taud(h: ITHeader, samples: list, instruments: list,
-                  patterns_rows: list, decompress: bool) -> bytes:
+                  patterns_rows: list, decompress: bool,
+                  with_project_data: bool = True) -> bytes:
     # ── Resolve IT recalls ───────────────────────────────────────────────────
     vprint("  resolving IT recalls…")
     resolve_it_recalls(patterns_rows, h.order_list, 64, h.link_gef,
@@ -1808,14 +1810,6 @@ def assemble_taud(h: ITHeader, samples: list, instruments: list,
 
     # ── Header ───────────────────────────────────────────────────────────────
     sig    = (SIGNATURE + b' ' * 14)[:14]
-    header = (
-        TAUD_MAGIC +
-        bytes([TAUD_VERSION, 1]) +
-        struct.pack('<I', comp_size) +
-        b'\x00\x00\x00\x00' +
-        sig
-    )
-    assert len(header) == TAUD_HEADER_SIZE
 
     # Compress pattern bin and cue sheet (per Taud spec)
     pat_comp = compress_blob(bytes(pat_bin), "pattern bin")
@@ -1846,7 +1840,36 @@ def assemble_taud(h: ITHeader, samples: list, instruments: list,
     )
     assert len(song_table) == TAUD_SONG_ENTRY
 
-    return header + compressed + song_table + pat_comp + cue_comp
+    # Project Data (optional). IT distinguishes instruments from samples, so
+    # both INam and SNam can carry distinct content. Slot 0 is unused, so the
+    # tables are 1-indexed with an empty slot-0 entry.
+    proj_data = b''
+    proj_off  = 0
+    if with_project_data:
+        inst_names = [''] + [(inst.name if inst is not None else '')
+                             for inst in instruments[:255]]
+        smp_names  = [''] + [(s.name if s is not None else '')
+                             for s in samples[:255]]
+        proj_data = build_project_data(
+            project_name=h.title,
+            instrument_names=inst_names,
+            sample_names=smp_names,
+        )
+        if proj_data:
+            proj_off = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY \
+                       + len(pat_comp) + len(cue_comp)
+            vprint(f"  project data: {len(proj_data)} bytes @ offset {proj_off}")
+
+    header = (
+        TAUD_MAGIC +
+        bytes([TAUD_VERSION, 1]) +
+        struct.pack('<I', comp_size) +
+        struct.pack('<I', proj_off) +
+        sig
+    )
+    assert len(header) == TAUD_HEADER_SIZE
+
+    return header + compressed + song_table + pat_comp + cue_comp + proj_data
 
 
 # ── Main ──────────────────────────────────────────────────────────────────────
@@ -1859,6 +1882,9 @@ def main():
     ap.add_argument('-v', '--verbose', action='store_true')
     ap.add_argument('--no-decompress', action='store_true',
                     help='Treat compressed IT samples as silent (debug)')
+    ap.add_argument('--no-project-data', action='store_true',
+                    help='Omit the optional Project Data section '
+                         '(song / instrument / sample names)')
     args = ap.parse_args()
     set_verbose(args.verbose)
 
@@ -1878,7 +1904,8 @@ def main():
     patterns_rows = parse_patterns(data, h)
 
     taud = assemble_taud(h, samples, instruments, patterns_rows,
-                         decompress=not args.no_decompress)
+                         decompress=not args.no_decompress,
+                         with_project_data=not args.no_project_data)
 
     with open(args.output, 'wb') as f:
         f.write(taud)
diff --git a/mod2taud.py b/mod2taud.py
index 1b549c9..937c024 100644
--- a/mod2taud.py
+++ b/mod2taud.py
@@ -40,6 +40,7 @@ from taud_common import (
     J_SEMI_TABLE,
     d_arg_to_col, resample_linear, rescale_offset_effects, encode_cue, deduplicate_patterns,
     encode_song_entry, compress_blob,
+    build_project_data,
 )
 
 
@@ -675,7 +676,7 @@ def find_initial_bpm_speed(patterns: list, order_list: list) -> tuple:
     return speed, tempo
 
 
-def assemble_taud(mod: dict) -> bytes:
+def assemble_taud(mod: dict, with_project_data: bool = True) -> bytes:
     samples    = mod['samples']
     patterns   = mod['patterns']
     order_list = mod['order_list']
@@ -728,14 +729,6 @@ def assemble_taud(mod: dict) -> bytes:
     song_offset = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY
 
     sig = (SIGNATURE + b' ' * 14)[:14]
-    header = (
-        TAUD_MAGIC +
-        bytes([TAUD_VERSION, 1]) +
-        struct.pack('<I', comp_size) +
-        b'\x00\x00\x00\x00' +
-        sig
-    )
-    assert len(header) == TAUD_HEADER_SIZE
 
     vprint("  building pattern bin…")
     inst_vols = {
@@ -790,7 +783,32 @@ def assemble_taud(mod: dict) -> bytes:
     )
     assert len(song_table) == TAUD_SONG_ENTRY
 
-    return header + compressed + song_table + pat_comp + cue_comp
+    # Project Data (optional). MOD samples *are* its instruments — the names
+    # populate both INam and SNam (1-based; slot 0 empty).
+    proj_data = b''
+    proj_off  = 0
+    if with_project_data:
+        names = [''] + [s.name for s in samples[:255]]
+        proj_data = build_project_data(
+            project_name=mod['title'],
+            instrument_names=names,
+            sample_names=names,
+        )
+        if proj_data:
+            proj_off = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY \
+                       + len(pat_comp) + len(cue_comp)
+            vprint(f"  project data: {len(proj_data)} bytes @ offset {proj_off}")
+
+    header = (
+        TAUD_MAGIC +
+        bytes([TAUD_VERSION, 1]) +
+        struct.pack('<I', comp_size) +
+        struct.pack('<I', proj_off) +
+        sig
+    )
+    assert len(header) == TAUD_HEADER_SIZE
+
+    return header + compressed + song_table + pat_comp + cue_comp + proj_data
 
 
 # ── Main ─────────────────────────────────────────────────────────────────────
@@ -802,6 +820,9 @@ def main():
     ap.add_argument('output', help='Output .taud file')
     ap.add_argument('-v', '--verbose', action='store_true',
                     help='Print conversion details to stderr')
+    ap.add_argument('--no-project-data', action='store_true',
+                    help='Omit the optional Project Data section '
+                         '(song / instrument / sample names)')
     args = ap.parse_args()
 
     set_verbose(args.verbose)
@@ -816,7 +837,7 @@ def main():
     vprint(f"  orders={len(mod['order_list'])}, patterns={mod['n_patterns']}, "
            f"samples={sum(1 for s in mod['samples'] if s.sample_data)}")
 
-    taud = assemble_taud(mod)
+    taud = assemble_taud(mod, with_project_data=not args.no_project_data)
 
     with open(args.output, 'wb') as f:
         f.write(taud)
diff --git a/mon2taud.py b/mon2taud.py
index 8590d49..cbf1ce7 100644
--- a/mon2taud.py
+++ b/mon2taud.py
@@ -35,6 +35,7 @@ from taud_common import (
     SEL_SET, SEL_FINE,
     J_SEMI_TABLE,
     encode_cue, deduplicate_patterns, encode_song_entry, compress_blob,
+    build_project_data,
 )
 
 
@@ -298,7 +299,7 @@ def find_initial_speed(patterns: list, order_list: list, num_voices: int) -> int
 
 # ── Top-level assembly ───────────────────────────────────────────────────────
 
-def assemble_taud(mon: dict) -> bytes:
+def assemble_taud(mon: dict, with_project_data: bool = True) -> bytes:
     num_voices = mon['num_voices']
     patterns   = mon['patterns']
     order_list = mon['order_list']
@@ -347,17 +348,7 @@ def assemble_taud(mon: dict) -> bytes:
     pat_comp = compress_blob(bytes(pat_bin),   "pattern bin")
     cue_comp = compress_blob(bytes(cue_sheet), "cue sheet")
 
-    # Header: magic, version, num_songs=1, comp_size of sample+inst, projOff=0, sig.
     sig = (SIGNATURE + b' ' * 14)[:14]
-    header = (
-        TAUD_MAGIC
-        + bytes([TAUD_VERSION, 1])
-        + struct.pack('<I', comp_size)
-        + b'\x00\x00\x00\x00'
-        + sig
-    )
-    assert len(header) == TAUD_HEADER_SIZE
-
     song_offset = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY
 
     # BPM 150 + ticks=mon_speed → row rate = 60/mon_speed (matches Monotone).
@@ -384,7 +375,32 @@ def assemble_taud(mon: dict) -> bytes:
     )
     assert len(song_table) == TAUD_SONG_ENTRY
 
-    return header + compressed + song_table + pat_comp + cue_comp
+    # Project Data (optional). Monotone has no title, no user instruments and
+    # no per-sample names, but we still emit one identifying entry so the
+    # synthesised square slot is documented.
+    proj_data = b''
+    proj_off  = 0
+    if with_project_data:
+        proj_data = build_project_data(
+            instrument_names=['', 'PC speaker square'],
+            sample_names=['', 'PC speaker square'],
+        )
+        if proj_data:
+            proj_off = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY \
+                       + len(pat_comp) + len(cue_comp)
+            vprint(f"  project data: {len(proj_data)} bytes @ offset {proj_off}")
+
+    # Header: magic, version, num_songs=1, comp_size of sample+inst, projOff, sig.
+    header = (
+        TAUD_MAGIC
+        + bytes([TAUD_VERSION, 1])
+        + struct.pack('<I', comp_size)
+        + struct.pack('<I', proj_off)
+        + sig
+    )
+    assert len(header) == TAUD_HEADER_SIZE
+
+    return header + compressed + song_table + pat_comp + cue_comp + proj_data
 
 
 # ── Main ─────────────────────────────────────────────────────────────────────
@@ -396,6 +412,9 @@ def main():
     ap.add_argument('output', help='Output .taud file')
     ap.add_argument('-v', '--verbose', action='store_true',
                     help='Print conversion details to stderr')
+    ap.add_argument('--no-project-data', action='store_true',
+                    help='Omit the optional Project Data section '
+                         '(song / instrument / sample names)')
     args = ap.parse_args()
 
     set_verbose(args.verbose)
@@ -408,7 +427,7 @@ def main():
     vprint(f"  songLen={mon['song_len']}, voices={mon['num_voices']}, "
            f"patterns={mon['n_patterns']}, orders={len(mon['order_list'])}")
 
-    taud = assemble_taud(mon)
+    taud = assemble_taud(mon, with_project_data=not args.no_project_data)
 
     with open(args.output, 'wb') as f:
         f.write(taud)
diff --git a/s3m2taud.py b/s3m2taud.py
index 65341b6..2aae375 100644
--- a/s3m2taud.py
+++ b/s3m2taud.py
@@ -44,6 +44,7 @@ from taud_common import (
     J_SEMI_TABLE,
     d_arg_to_col, resample_linear, rescale_offset_effects, encode_cue, deduplicate_patterns,
     normalise_sample, encode_song_entry, compress_blob,
+    build_project_data,
 )
 
 
@@ -718,7 +719,8 @@ def find_initial_bpm_speed(patterns: list, order_list: list,
     return speed, tempo
 
 
-def assemble_taud(h: S3MHeader, instruments: list, patterns: list) -> bytes:
+def assemble_taud(h: S3MHeader, instruments: list, patterns: list,
+                  with_project_data: bool = True) -> bytes:
     # Determine active channels (bit7 clear = enabled)
     active_channels = [i for i, cs in enumerate(h.channel_settings)
                        if i < 32 and not (cs & 0x80)][:NUM_VOICES]
@@ -765,16 +767,7 @@ def assemble_taud(h: S3MHeader, instruments: list, patterns: list) -> bytes:
     song_offset = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY
     num_taud_pats = P * C
 
-    # Header (32 bytes): magic(8)+ver(1)+numSongs(1)+compSize(4)+rsvd(4)+sig(14)
     sig = (SIGNATURE + b' ' * 14)[:14]
-    header = (
-        TAUD_MAGIC +
-        bytes([TAUD_VERSION, 1]) +
-        struct.pack('<I', comp_size) +
-        b'\x00\x00\x00\x00' +
-        sig
-    )
-    assert len(header) == TAUD_HEADER_SIZE
 
     # Pattern bin: for each s3m pattern, for each active channel, 512 bytes
     vprint("  building pattern bin…")
@@ -835,7 +828,34 @@ def assemble_taud(h: S3MHeader, instruments: list, patterns: list) -> bytes:
     )
     assert len(song_table) == TAUD_SONG_ENTRY
 
-    return header + compressed + song_table + pat_comp + cue_comp
+    # Project Data (optional). S3M instruments and samples share the same slot
+    # space, so the names go into both INam and SNam (1-based; slot 0 empty).
+    proj_data = b''
+    proj_off  = 0
+    if with_project_data:
+        names = [''] + [(inst.name if inst is not None else '')
+                        for inst in instruments[:255]]
+        proj_data = build_project_data(
+            project_name=h.title,
+            instrument_names=names,
+            sample_names=names,
+        )
+        if proj_data:
+            proj_off = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY \
+                       + len(pat_comp) + len(cue_comp)
+            vprint(f"  project data: {len(proj_data)} bytes @ offset {proj_off}")
+
+    # Header (32 bytes): magic(8)+ver(1)+numSongs(1)+compSize(4)+projOff(4)+sig(14)
+    header = (
+        TAUD_MAGIC +
+        bytes([TAUD_VERSION, 1]) +
+        struct.pack('<I', comp_size) +
+        struct.pack('<I', proj_off) +
+        sig
+    )
+    assert len(header) == TAUD_HEADER_SIZE
+
+    return header + compressed + song_table + pat_comp + cue_comp + proj_data
 
 
 # ── Main ─────────────────────────────────────────────────────────────────────
@@ -847,6 +867,9 @@ def main():
     ap.add_argument('output', help='Output .taud file')
     ap.add_argument('-v', '--verbose', action='store_true',
                     help='Print conversion details to stderr')
+    ap.add_argument('--no-project-data', action='store_true',
+                    help='Omit the optional Project Data section '
+                         '(song / instrument / sample names)')
     args = ap.parse_args()
 
     set_verbose(args.verbose)
@@ -862,7 +885,8 @@ def main():
     instruments = parse_instruments(data, h)
     patterns    = parse_patterns(data, h)
 
-    taud = assemble_taud(h, instruments, patterns)
+    taud = assemble_taud(h, instruments, patterns,
+                         with_project_data=not args.no_project_data)
 
     with open(args.output, 'wb') as f:
         f.write(taud)
diff --git a/taud_common.py b/taud_common.py
index 573aeb6..6790258 100644
--- a/taud_common.py
+++ b/taud_common.py
@@ -411,6 +411,96 @@ def encode_song_entry(song_offset: int, num_voices: int, num_patterns: int,
     return entry
 
 
+# ── Project Data section (terranmon.txt:2601+) ───────────────────────────────
+
+PROJECT_DATA_MAGIC = bytes([0x1E, 0x54, 0x61, 0x75, 0x64, 0x50, 0x72, 0x4A])  # \x1ETaudPrJ
+PROJECT_DATA_HEADER_SIZE = 16   # 8-byte magic + 8 reserved
+
+
+def _name_table_blob(names) -> bytes:
+    """Encode a list of names (slot-indexed; slot 0 is left empty in source) as
+    0x1E-separated UTF-8 bytes. Trailing empty slots are trimmed to save space.
+    Returns b'' when every name is empty.
+    """
+    if not names:
+        return b''
+    end = len(names)
+    while end > 0 and not names[end - 1]:
+        end -= 1
+    if end == 0:
+        return b''
+    return b'\x1E'.join((n or '').encode('utf-8', 'replace') for n in names[:end])
+
+
+def build_project_data(*, project_name: str = '',
+                       author: str = '',
+                       copyright_str: str = '',
+                       sample_names=None,
+                       instrument_names=None,
+                       pattern_names=None,
+                       song_metadata=None) -> bytes:
+    """Build the optional PROJECT DATA section payload.
+
+    Returns the full block (8-byte magic + 8 reserved bytes + concatenated
+    FourCC sections), or b'' when there's nothing to write so the caller can
+    leave the header's projOff field at zero.
+
+    `sample_names` / `instrument_names` / `pattern_names` are slot-indexed
+    lists (entry 0 is typically empty since slot 0 is reserved); they are
+    encoded as 0x1E-separated UTF-8 strings inside SNam / INam / pNam blocks.
+
+    `song_metadata` is an optional list of dicts, one per song:
+        { 'index': int (0..255),
+          'notation': int = 0,
+          'beat_pri': int = 4,
+          'beat_sec': int = 16,
+          'name': str = '',
+          'composer': str = '',
+          'copyright': str = '' }
+    """
+    sections = []
+
+    def add(fourcc: bytes, payload: bytes) -> None:
+        if not payload:
+            return
+        sections.append(fourcc + struct.pack('<I', len(payload)) + payload)
+
+    if project_name:
+        add(b'PNam', project_name.encode('utf-8', 'replace'))
+    if author:
+        add(b'PCom', author.encode('utf-8', 'replace'))
+    if copyright_str:
+        add(b'PCpr', copyright_str.encode('utf-8', 'replace'))
+
+    add(b'INam', _name_table_blob(instrument_names))
+    add(b'SNam', _name_table_blob(sample_names))
+    add(b'pNam', _name_table_blob(pattern_names))
+
+    if song_metadata:
+        smet = bytearray()
+        for entry in song_metadata:
+            idx      = entry.get('index', 0) & 0xFF
+            notation = entry.get('notation', 0) & 0xFFFF
+            beat_pri = entry.get('beat_pri', 4) & 0xFF
+            beat_sec = entry.get('beat_sec', 16) & 0xFF
+            name_b = entry.get('name', '').encode('utf-8', 'replace') + b'\x00'
+            comp_b = entry.get('composer', '').encode('utf-8', 'replace') + b'\x00'
+            copr_b = entry.get('copyright', '').encode('utf-8', 'replace') + b'\x00'
+            payload = (struct.pack('<HBB', notation, beat_pri, beat_sec)
+                       + name_b + comp_b + copr_b)
+            smet.append(idx)
+            smet += struct.pack('<I', len(payload))
+            smet += payload
+        add(b'sMet', bytes(smet))
+
+    if not sections:
+        return b''
+
+    return PROJECT_DATA_MAGIC + b'\x00' * 8 + b''.join(sections)
+
+
+# ── Sample normalisation ─────────────────────────────────────────────────────
+
 def normalise_sample(raw: bytes, signed: bool, is_16bit: bool,
                      is_stereo: bool, name: str) -> bytes:
     """Return unsigned 8-bit mono sample bytes, downmixing/depthing as needed."""
diff --git a/xm2taud.py b/xm2taud.py
index 56e34b7..1e06503 100644
--- a/xm2taud.py
+++ b/xm2taud.py
@@ -59,6 +59,7 @@ from taud_common import (
     encode_cue, deduplicate_patterns,
     normalise_sample, encode_song_entry, nearest_minifloat, compress_blob,
     CUE_INST_NOP, CUE_INST_HALT, CUE_INST_LEN, cue_instruction_len,
+    build_project_data,
 )
 
 
@@ -1245,7 +1246,8 @@ def _active_channels_xm(h: XMHeader, patterns: list) -> list:
 
 # ── Main assembly ─────────────────────────────────────────────────────────────
 
-def assemble_taud(h: XMHeader, patterns: list, instruments: list) -> bytes:
+def assemble_taud(h: XMHeader, patterns: list, instruments: list,
+                  with_project_data: bool = True) -> bytes:
     # XM envelope frames advance once per row tick. Tick rate is derived
     # from BPM the same way ProTracker derives it: ticks_per_sec = BPM × 2/5
     # (matches MilkyTracker's tick clock and it2taud's ticks_per_sec).
@@ -1412,14 +1414,6 @@ def assemble_taud(h: XMHeader, patterns: list, instruments: list) -> bytes:
     # ── Header / song table ─────────────────────────────────────────────────
     song_offset = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY
     sig    = (SIGNATURE + b' ' * 14)[:14]
-    header = (
-        TAUD_MAGIC +
-        bytes([TAUD_VERSION, 1]) +
-        struct.pack('<I', comp_size) +
-        b'\x00\x00\x00\x00' +
-        sig
-    )
-    assert len(header) == TAUD_HEADER_SIZE
 
     pat_comp = compress_blob(bytes(pat_bin), "pattern bin")
     cue_comp = compress_blob(bytes(sheet),   "cue sheet")
@@ -1448,7 +1442,37 @@ def assemble_taud(h: XMHeader, patterns: list, instruments: list) -> bytes:
     )
     assert len(song_table) == TAUD_SONG_ENTRY
 
-    return header + compressed + song_table + pat_comp + cue_comp
+    # Project Data (optional). XM nests samples under instruments and the
+    # converter creates one Taud slot per (xm_inst, sample) pair, so SNam is
+    # populated from the per-Taud-slot proxies and INam carries the parent
+    # XM-level instrument names (1-based; slot 0 empty).
+    proj_data = b''
+    proj_off  = 0
+    if with_project_data:
+        inst_names = [''] + [(inst.name if inst is not None else '')
+                             for inst in instruments[:255]]
+        smp_names = [''] + [(p.name if p is not None else '')
+                            for p in proxies[1:256]]
+        proj_data = build_project_data(
+            project_name=h.title,
+            instrument_names=inst_names,
+            sample_names=smp_names,
+        )
+        if proj_data:
+            proj_off = TAUD_HEADER_SIZE + comp_size + TAUD_SONG_ENTRY \
+                       + len(pat_comp) + len(cue_comp)
+            vprint(f"  project data: {len(proj_data)} bytes @ offset {proj_off}")
+
+    header = (
+        TAUD_MAGIC +
+        bytes([TAUD_VERSION, 1]) +
+        struct.pack('<I', comp_size) +
+        struct.pack('<I', proj_off) +
+        sig
+    )
+    assert len(header) == TAUD_HEADER_SIZE
+
+    return header + compressed + song_table + pat_comp + cue_comp + proj_data
 
 
 # ── Main ──────────────────────────────────────────────────────────────────────
@@ -1460,6 +1484,9 @@ def main():
     ap.add_argument('input',  help='Input .xm file')
     ap.add_argument('output', help='Output .taud file')
     ap.add_argument('-v', '--verbose', action='store_true')
+    ap.add_argument('--no-project-data', action='store_true',
+                    help='Omit the optional Project Data section '
+                         '(song / instrument / sample names)')
     args = ap.parse_args()
     set_verbose(args.verbose)
 
@@ -1478,7 +1505,8 @@ def main():
     patterns, after_patterns = parse_patterns(data, h, patterns_off)
     instruments, _after = parse_instruments(data, h, after_patterns)
 
-    taud = assemble_taud(h, patterns, instruments)
+    taud = assemble_taud(h, patterns, instruments,
+                         with_project_data=not args.no_project_data)
 
     with open(args.output, 'wb') as f:
         f.write(taud)