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Sylpheed/docs/re/data/voice-region-chunk-census.txt
sylph-decoder de2fe4a110 re: the voice-region third chunk is a different structure from the BGM one 
The port hit a 2+1 chunk signature on a resolved movie-voice region and asked
whether the bank-header explanation that closed HANDOFF Q10 also covers it,
rather than assuming it. It does not, and the discriminator is mechanical.

Disc-wide over the 95 English movie-voice regions the manifest binds:

  78 open with a bank header -- bank_header_len fires, 10240 B = 5 packets
     exactly, every time. That is the BGM case.
  17 open with a leading headerless stream -- bank_header_len is None, and all
     17 have length congruent to 1392 mod 2048, the disc s own derived data
     offset. No other residue occurs.
   0 begin at a RIFF.

Counting chunks does not discriminate: 8 bank-header regions also yield three
chunks. slb.rs already predicted this in its own doc comment -- the header
signature has "zero false positives on the 7993 mid-bank windows, where the
leading region IS real" -- and a voice region is a mid-bank window by
construction.

Also tested the obvious defence of dropping the leading chunk, that it is the
predecessor cue s audio: 0 of 17 leading spans lie inside any other resolved
region, 0.0 percent on every one. The test finds overlaps where they exist (16
overlapping pairs among the regions, 60 exactly-adjacent boundaries, 73 of 78
bank-header regions starting where another ends), so the zero is not the
instrument.

Left open, with reach: the census covers movie-voice regions only, and the same
stream carries the in-mission VOICE_D_* cues, which are not enumerated -- the
leading bytes plausibly belong to one of those. Could not be settled by
listening: no XMA1 decoder in this container, and sylpheed-cli audio info
reports these chunks as 16 channels / 4310 Hz / 2-bit, which is visibly wrong.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
2026-08-29 14:56:17 +00:00

104 lines
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104 movies in the manifest
ADV 433930240.. 437044592 3114352 B chunks 3 leading STREAM (808304 B = 394 packets + 1392 B)
S00A 452798464.. 455499120 2700656 B chunks 3 leading STREAM (1324400 B = 646 packets + 1392 B)
S01A 456003584.. 460117360 4113776 B chunks 3 leading STREAM (1154416 B = 563 packets + 1392 B)
RT01A 437044592.. 437345648 301056 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT01B 437345648.. 437712240 366592 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT01C_1 437712240.. 438080880 368640 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT01C_2 438080880.. 438451568 370688 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S02A 460117360.. 461518192 1400832 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
S02B 462022656.. 463838576 1815920 B chunks 3 leading STREAM (431472 B = 210 packets + 1392 B)
S02C 464343040.. 469970288 5627248 B chunks 3 leading STREAM (1869168 B = 912 packets + 1392 B)
RT02A 438451568.. 438789488 337920 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT02B 438789488.. 439192944 403456 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT02C 439192944.. 439645552 452608 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT02D_1 439645552.. 439852400 206848 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT02D_2 439852400.. 440112496 260096 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s02A 430128496.. 430196080 67584 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s02H 430335344.. 430390640 55296 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S03A 470474752.. 472020336 1545584 B chunks 3 leading STREAM (253296 B = 123 packets + 1392 B)
RT03A 440112496.. 440448368 335872 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT03B 440448368.. 440730992 282624 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT03C 440730992.. 441144688 413696 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT03D 441144688.. 441773424 628736 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s03A 430128496.. 430196080 67584 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s03H 430335344.. 430390640 55296 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S04B 480507904.. 482938224 2430320 B chunks 3 leading STREAM (556400 B = 271 packets + 1392 B)
RT04A 441773424.. 442019184 245760 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT04B 442019184.. 442254704 235520 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s02A 430265712.. 430335344 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S05A 482938224.. 483433840 495616 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
RT05A 442254704.. 442578288 323584 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT05B 442578288.. 442938736 360448 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT05C 442938736.. 443143536 204800 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s02A 430128496.. 430196080 67584 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S06A 483938304.. 485457264 1518960 B chunks 3 leading STREAM (351600 B = 171 packets + 1392 B)
S06B 485961728.. 488908144 2946416 B chunks 3 leading STREAM (607600 B = 296 packets + 1392 B)
RT06A 443143536.. 443460976 317440 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT06B 443460976.. 443802992 342016 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT06C 443802992.. 444046704 243712 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT06D 444046704.. 444183920 137216 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s06A 430128496.. 430196080 67584 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s06H 430335344.. 430390640 55296 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S07A 489412608.. 491443568 2030960 B chunks 3 leading STREAM (505200 B = 246 packets + 1392 B)
S07B 491443568.. 491634032 190464 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
RT07A 444183920.. 444706160 522240 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT07B 444706160.. 444980592 274432 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT07C 444980592.. 445130096 149504 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s07A 430265712.. 430335344 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s07H 430390640.. 430464368 73728 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT08A 445130096.. 445326704 196608 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT08B 445326704.. 445517168 190464 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT08C 445517168.. 445676912 159744 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s08A 430265712.. 430335344 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S09B 492138496.. 493743472 1604976 B chunks 3 leading STREAM (177520 B = 86 packets + 1392 B)
RT09A 445676912.. 446000496 323584 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT09B 446000496.. 446485872 485376 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT09C 446485872.. 446748016 262144 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT09D 446748016.. 447149424 401408 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s09A 430196080.. 430265712 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s09H 430335344.. 430390640 55296 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT10A 447149424.. 447272304 122880 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT10B 447272304.. 447356272 83968 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S11A 501900656.. 502173040 272384 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
S11C 502677504.. 505619824 2942320 B chunks 3 leading STREAM (742768 B = 362 packets + 1392 B)
RT11A 447356272.. 447776112 419840 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT11B 447776112.. 447880560 104448 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT11C 447880560.. 448097648 217088 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s11A 430196080.. 430265712 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S12A 505619824.. 506191216 571392 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
S12B 506191216.. 506262896 71680 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
S12C 506767360.. 512406896 5639536 B chunks 3 leading STREAM (1844592 B = 900 packets + 1392 B)
RT12A 448097648.. 448374128 276480 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT12B_1 448374128.. 448544112 169984 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT12B_2 448544112.. 448767344 223232 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s07A 430265712.. 430335344 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s07H 430390640.. 430464368 73728 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S13A 512911360.. 514874736 1963376 B chunks 3 leading STREAM (402800 B = 196 packets + 1392 B)
S13B 514874736.. 515278192 403456 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
RT13A 448767344.. 449002864 235520 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT13B_1 449002864.. 449099120 96256 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT13B_2 449099120.. 449340784 241664 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s13A 430265712.. 430335344 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S14A 515782656.. 521794928 6012272 B chunks 3 leading STREAM (1817968 B = 887 packets + 1392 B)
RT14A 449340784.. 449721712 380928 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT14B 449721712.. 450033008 311296 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT14C 450033008.. 450280816 247808 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_DS_s14H 430390640.. 430464368 73728 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
S15A 522299392.. 524309872 2010480 B chunks 3 leading STREAM (255344 B = 124 packets + 1392 B)
S15B 524309872.. 525626736 1316864 B chunks 3 BANK HEADER (10240 B = 5 packets exactly)
S15C 526131200.. 529565040 3433840 B chunks 3 leading STREAM (931184 B = 454 packets + 1392 B)
RT15A 450280816.. 450985328 704512 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT15B 450985328.. 451282288 296960 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
RT15C 451282288.. 451614064 331776 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s15A 430196080.. 430265712 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s24A 430196080.. 430265712 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
hokyu_LS_s27A 430196080.. 430265712 69632 B chunks 1 BANK HEADER (10240 B = 5 packets exactly)
78 region(s) open with a BANK HEADER (bank_header_len fires)
17 open with a leading STREAM
0 start at a RIFF
leading-stream length mod 2048, i.e. the derived data offset:
1392 B x17
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