This commit adds a feature to the multisource MIDI drivers which allows setting
a default value for most controllers. This default is then applied at the start
of every new track, which ensures controllers are in the correct state.
This can be used for games which use some controller, but do not reset it at
the start of each track, which can lead to incorrect playback.
The default source neutral volume for the Miles MIDI driver is set at 256.
However, the default source volume was the same as that of the regular MT-32/GM
driver: 255. This would cause a small volume decrease if a game did not set
source volume.
This commit fixes this issue by setting the default source volume for the Miles
MIDI driver at 256.
This adds a MidiDriver property which controls the Miles AIL/MSS version to
emulate. This controls the initialization of MT-32 and GM devices. MSS v3 added
GM support, which caused some differences between v2 and v3 in how MIDI devices
are initialized. Some games might rely on certain default settings for correct
playback.
This adds applying source volume for all sources to the Miles MIDI driver. This
was missing and caused changes to user volume not to be applied for some games.
When the MIDI parser wanted to stop all notes on a MIDI device, it would send
an All Notes Off message and, optionally, a Sustain off message on all 16 MIDI
channels. This is inefficient for devices like the MT-32, which uses only 9
channels. The MT-32 hardware is also quite slow, so it is more responsive if it
has to process less messages.
I've added a generic stopAllNotes message to the MIDI driver using the old
method, which can be overriden by more specific implementations in subclasses.
The Miles MIDI driver implementation sends All Notes Off only on the channels
used by the MT-32. There are probably also more efficient implementations
possible for f.e. AdLib.
XMIDI timbre chunk processing was implemented using a callback. This
reimplements this using an interface for the necessary driver method, which is
a somewhat cleaner solution.
XMIDI data for the MT-32 can contain a timbre chunk which contains the custom
timbre numbers used for a track. Before starting playback of the track, the
timbres must be loaded into the MT-32 using SysEx messages. Each SysEx message
needs a delay before sending the next message to give the MT-32 enough time to
process it.
The delays between the messages were generated using the OSystem::delayMillis
function. This throws off the timing of the MidiParser, which causes MIDI
messages to "pile up", in this case at the start of the track. This change adds
a queue to the Miles MIDI driver, which can store the SysEx messages that must
be executed. The MidiParser suspends playback until the driver has sent all
messages in the queue.
This fixes the start of tracks in The 7th Guest, which had incorrect timing.
Because of the new SysEx queue, MT-32 initialization of The 7th Guest takes a
bit longer than it did before. The game plays an animation of a fixed length
and aborts the initialization if it is not done by the end of the animation.
This problem was already fixed for the GM initialization, so I've applied the
same fix for the MT-32.
XMIDI defines controllers which allow the MIDI data to send controller changes
that build up SysEx messages. The last SysEx data byte is specified using the
Final Data controller, which should append the final byte to the SysEx message
and send it to the MIDI device. The old implementation did not append the last
byte. Additionally, when increasing the memory address for the SysEx, it did
not take into account that the MIDI bytes are 7 bit.
This commit fixes these issues. This restores a missing data byte in a SySex in
the MIDI initialization of The 7th Guest.
* KYRA: Added GM initialization for Lands of Lore
The original interpreter of Lands of Lore uses two executables, which
both do initialization of MIDI devices. The main executable runs a
sysex file for GM devices; the intro executable does not.
ScummVM only does MIDI initialization once and it performs this like
the intro executable. I've added the GM initialization of the main
executable. Note that the initialization file consists mostly of
sysexes which alter the display of the SC-55, so it's not particulary
useful. Not many games did this though, so I thought it would be a
fun feature to include.
I also noticed that the check which distinguishes between the two
demo versions of LoL did not work properly; the useAltShapeHeader
flag was true for both versions. I've changed it to check for the
existence of a PAK file which was only included with one of the two
demos.
* MIDI: Delay parser after handling SysEx events
This changes the way delays between SysEx events in MIDI data are handled from
delaying the backend to delaying the MidiParser.
SysEx events require a delay between events to ensure correct processing by the
MIDI device. This is usually implemented by calling OSystem::delayMillis.
Some games use some form of MIDI sequence filled with SysEx messages to
initialize the MIDI device. This is handled by the MidiParser. Using the
delayMillis method causes the following MIDI events to be "bunched up" and be
executed in a shorter timespan than intended.
I've altered this by making the MidiParser stop parsing when a SysEx event is
encountered and not enough time has passed since the last SysEx. After enough
time has passed, the next SysEx is sent and parsing resumes. To facilitate
this, I've introduced an alternate sysExNoDelay fuction on the MidiDiver. This
does not execute the delay itself, but instead returns the required delay time,
so the parser can handle this instead.
I've currently only implemented this method for the Miles MT-32/GM driver. For
other driver implementations, this will call the regular sysEx method and
return a 0 delay time, so there will be no change in behavior.
This restores a sound effect at the end of the Legend of Kyrandia MT-32 MIDI
initialization. Before, the Note On and Note Off events would be transmitted
instantly after each other, causing the notes not to play.
* MIDI: Add instrument bank fallback
Some games rely on a feature of the Roland SC-55 v1.xx that corrects invalid
instrument banks. This feature was removed in later versions of the device and
not implemented in most other GM devices, causing some MIDI data (sound effects
mostly) to play incorrectly.
Specifically, this applies to Lands of Lore. For example, in the intro, the
sound effect of the ring sparkling uses an incorrect instrument bank. Depending
on how the MIDI device handles this, the sound will play correctly, with the
wrong instrument, or not at all.
This commit emulates the SC-55 functionality that corrects the invalid bank
numbers. I've implemented this (partially) on the MidiDriver, so that it can be
re-used for other games (Xeen 4 and 5 also have this issue with some sound
effects).
* KYRA: Start MIDI playback after selecting track
The MIDI parser would automatically start playback after loading MIDI data, but
KYRA engine games use MIDI files with multiple tracks. Because of this it was
necessary to immediately stop playback after loading MIDI data, and then select
the track that should be played for correct playback. The parser now has a
feature to disable automatically starting playback, so I've implemented this
for KYRA.
* KYRA: Improve stopping MIDI playback
In two places All Notes Off events were sent on all channels to stop MIDI
playback of the background music. However, this will also cut off any MIDI
sound effects which are playing. Where needed I've replaced this with simply
stopping playback of the background music; the parser will turn off any active
notes.
I've also made sure playback is stopped before freeing the music data
memory to prevent any issues.
I've added sending All Notes Off events when the game quits, just in case any
hanging notes are not ended by the parsers (should not really be a problem
though).
* MIDI/KYRA: Add pausing playback to MIDI parser
* KYRA: Fix invalid track selection
If a game would attempt to play an invalid track, the parser would start
playing the previously selected track. Fixed this so the parser will not start
playing.
* MIDI/KYRA: Add channel locking and GM to XMIDI
This improves support for XMIDI channel locking and moves it from the KYRA
engine to the generic Miles MIDI driver. To support this, a source parameter
is added to the XMIDI parser and Miles driver so the driver can distinguish
several XMIDI parser instances sending MIDI events. I've also added GM support
to the generic Miles MIDI driver.
The previous implementation of channel locking did not always track and restore
controller values properly when unlocking a channel. Specifically, at the start
of Legend of Kyrandia, when Brandon talks to the tree, the tree "creaking"
sound effect uses some channels from the background music. The volume of the
music channels was not correctly restored, resulting in some instruments being
much louder then others.
Another issue was that volume was not always properly set when locking a
channel. In the Legend of Kyrandia intro, when Brandon is lifted up to the
house, some sound effects were missing because MIDI channel volume was 0.
This new implementation fixes these issues.
* MIDI: Suppress Miles controller warnings
Several Miles controller MIDI messages generate warnings in the XMIDI parser,
even though they are handled by the Miles drivers. I've removed these.
* MIDI: Fix Codacy issues
