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This patch includes enhancements to the ScummVM integration with
SCI engine, with particular focus on SCI32 support.
1. Fixes audio volumes syncing erroneously to ScummVM in games
that modify the audio volume without user action (e.g. SCI1.1
talkies that reduce music volume during speech playback). Now,
volumes will only be synchronised when the user interacts with
the game's audio settings. This mechanism works by looking for
a known volume control object in the stack, and only syncing
when the control object is present. (Ports and planes were
researched and found unreliable.)
2. Fixes audio syncing in SCI32 games that do not set game
volumes through kDoSoundMasterVolume/kDoAudioVolume, like GK1,
GK2, Phant1, and Torin.
3. Fixes speech/subtitles syncing in SCI32 games that do not use
global 90, like LSL6hires.
4. Fixes in-game volume controls in SCI32 games reflecting
outdated audio volumes when a change is made during the game
from the ScummVM launcher.
5. Fixes SCI32 games that would restore volumes from save games
or reset volumes on startup, which caused game volumes to be
out-of-sync with ScummVM when started.
6. ScummVM integration code for audio sync has been abstracted
into a new GuestAdditions class. This keeps the ScummVM-
specific code all in one place, with only small hooks into the
engine code. ScummVM integrated save/load code should probably
also go here in the future.
Fixes Trac#9700.
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The previous fix for this bug was incorrect; it only happened
to work because of another bug: the number of exports was being
read incorrectly (reading the byte size of the export block, not
the number of exports), so the validation check for the export
number always passed. Then, the "small" offsets that were seen
were actually either invalid reads into the header of the next
block in the script (KQ4), or reads into the bad first export
table which contained an unfilled offset (Camelot).
Once the incorrect number of exports was fixed, the previous "fix"
broke in KQ4 because the export number validation started to work
correctly and the first export table does not have enough entries
(needs 2, has 1).
This patch fixes the bug by using the last export table in SCI0
scripts instead of the first export table. (This does not affect
most scripts, since only the buggy scripts have more than one
export table.)
Fixes Trac#9731.
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Currently translated at 100.0% (946 of 946 strings)
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1. KQ4 sound 104 has an extra 0xFC (MIDI Stop command/kEndOfTrack)
at the end of the resource, which causes an out-of-bounds read
because the filtering loop continues after the first 0xFC and
unconditionally attempts to read 2 bytes (expecting there to
always be a delta value + a command, whereas in this file there
is only another kEndOfTrack command). This is corrected by
exiting the filtering loop when a kEndOfTrack is encountered
and there is not enough data remaining in the resource to
continue reading.
2. KQ5 sound 699 is truncated, which causes the parser to attempt
to read past the end of the resource. This is addressed by
adding bounds checks that exit the mix loop early if there is
no more data available to read. This allows truncated sounds
to be played as far as possible (previously, trying to read
truncated resources would result in a fatal error).
3. midiMixChannels allocates an arbitrary amount of raw memory
for the mixed MIDI sequence, without performing any bounds
checking when writing to this memory, potentially leading to
a crash or silent corruption of adjacent memory. This is
mitigated by using SciSpan instead of a raw pointer for the
mixed data.
Fixes Trac#9727.
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Currently translated at 100.0% (946 of 946 strings)
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Currently translated at 98.9% (936 of 946 strings)
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Currently translated at 98.9% (936 of 946 strings)
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Currently translated at 100.0% (946 of 946 strings)
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Currently translated at 99.7% (944 of 946 strings)
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Happy incept day Leon!
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Currently translated at 100.0% (946 of 946 strings)
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Currently translated at 100.0% (946 of 946 strings)
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Currently translated at 100.0% (946 of 946 strings)
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