SCI32: Rewrite digital audio engine

This provides a complete implementation of kDoAudio through
SCI2.1mid, plus partial implementation of SCI3 features.

Digital audio calls shunted through kDoSound have also been
updated to go through the SCI32 audio mixer, though these shunts
are a bit hacky because the ScummVM implementation of kDoSound
does not currently match how SSCI kDoSound is designed.

It is probably possible in the future to just replace the SCI1.1
audio code (audio.cpp) with the new SCI32 code, since the major
differences seem to be that (1) SCI1.1 only supported one digital
audio playback channel (this is configurable already), (2) it
had extra commands for CD audio playback and queued sample
playback.

1 files changed, 1 insertions, 7 deletions

diff --git a/engines/sci/sound/audio.cpp b/engines/sci/sound/audio.cpp
index 71b081049e..4fb9a58003 100644
--- a/engines/sci/sound/audio.cpp
+++ b/engines/sci/sound/audio.cpp
@@ -253,13 +253,7 @@ static void deDPCM16(byte *soundBuf, Common::SeekableReadStream &audioStream, ui
 
 static void deDPCM8Nibble(byte *soundBuf, int32 &s, byte b) {
 	if (b & 8) {
-#ifdef ENABLE_SCI32
-		// SCI2.1 reverses the order of the table values here
-		if (getSciVersion() >= SCI_VERSION_2_1_EARLY)
-			s -= tableDPCM8[b & 7];
-		else
-#endif
-			s -= tableDPCM8[7 - (b & 7)];
+		s -= tableDPCM8[7 - (b & 7)];
 	} else
 		s += tableDPCM8[b & 7];
 	s = CLIP<int32>(s, 0, 255);