ZVISION: Boost volume for MPEG cutscenes

The high-resolution videos play back at much lower volume than the
original ones. This adds hard-coded values for how much to amplify
each cutscene. It's all done by ear, and it does introduce some
clipping, but I think it should be acceptable.

Of course, it could also be a problem with the audio decoder, so
this may be the wrong approach entirely.

1 files changed, 93 insertions, 2 deletions

diff --git a/engines/zvision/video/video.cpp b/engines/zvision/video/video.cpp
index 01e75a4a3d..54c113dc83 100644
--- a/engines/zvision/video/video.cpp
+++ b/engines/zvision/video/video.cpp
@@ -49,8 +49,99 @@ Video::VideoDecoder *ZVision::loadAnimation(const Common::String &fileName) {
 	else if (tmpFileName.hasSuffix(".avi"))
 		animation = new ZorkAVIDecoder();
 #if defined(USE_MPEG2) && defined(USE_A52)
-	else if (tmpFileName.hasSuffix(".vob"))
-		animation = new Video::MPEGPSDecoder();
+	else if (tmpFileName.hasSuffix(".vob")) {
+		// For some reason, we get much lower volume in the hi-res
+		// videos than in the low-res ones. So we artificially boost
+		// the volume here. This is an approximation, but I've tried
+		// to match the old volumes reasonably well.
+		//
+		// Some of these will cause audio clipping. Hopefully not
+		// enough to be noticeable.
+		double amplification = 0.0;
+		if (tmpFileName == "em00d011.vob") {
+			// The finale.
+			amplification = 10.0;
+		} else if (tmpFileName == "em00d021.vob") {
+			// Jack's escape and arrival at Flathead Mesa.
+			amplification = 9.0;
+		} else if (tmpFileName == "em00d032.vob") {
+			// The Grand Inquisitor's speech.
+			amplification = 11.0;
+		} else if (tmpFileName == "em00d122.vob") {
+			// Jack orders you to the radio tower.
+			amplification = 17.0;
+		} else if (tmpFileName == "em3ed012.vob") {
+			// The Grand Inquisitor gets the Coconut of Quendor.
+			amplification = 12.0;
+		} else if (tmpFileName == "g000d101.vob") {
+			// Griff gets captured.
+			amplification = 11.0;
+		} else if (tmpFileName == "g000d111.vob") {
+			// Brog gets totemized. The music seems to be mixed
+			// much softer in this than in the low-resolution
+			// version.
+			amplification = 12.0;
+		} else if (tmpFileName == "g000d122.vob") {
+			// Lucy gets captured.
+			amplification = 14.0;
+		} else if (tmpFileName == "g000d302.vob") {
+			// The Grand Inquisitor visits Jack in his cell.
+			amplification = 13.0;
+		} else if (tmpFileName == "g000d312.vob") {
+			// You get captured.
+			amplification = 14.0;
+		} else if (tmpFileName == "g000d411.vob") {
+			// Propaganda On Parade. No need to make it as loud as
+			// the low-resolution version.
+			amplification = 11.0;
+		} else if (tmpFileName == "pe1ed012.vob") {
+			// Jack lets you in with the lantern.
+			amplification = 14.0;
+		} else if (tmpFileName.hasPrefix("pe1ed")) {
+			// Jack answers the door. Several different ways.
+			amplification = 17.0;
+		} else if (tmpFileName == "pe5ed052.vob") {
+			// You get killed by the guards
+			amplification = 12.0;
+		} else if (tmpFileName == "pe6ed012.vob") {
+			// Jack gets captured by the guards
+			amplification = 17.0;
+		} else if (tmpFileName == "pp1ed022.vob") {
+			// Jack examines the lantern
+			amplification = 10.0;
+		} else if (tmpFileName == "qb1ed012.vob") {
+			// Lucy gets invited to the back room
+			amplification = 17.0;
+		} else if (tmpFileName.hasPrefix("qe1ed")) {
+			// Floyd answers the door. Several different ways.
+			amplification = 17.0;
+		} else if (tmpFileName == "qs1ed011.vob") {
+			// Jack explains the rules of the game.
+			amplification = 16.0;
+		} else if (tmpFileName == "qs1ed021.vob") {
+			// Jack loses the game.
+			amplification = 14.0;
+		} else if (tmpFileName == "uc1gd012.vob") {
+			// Y'Gael appears.
+			amplification = 12.0;
+		} else if (tmpFileName == "ue1ud012.vob") {
+			// Jack gets totemized... or what?
+			amplification = 12.0;
+		} else if (tmpFileName == "ue2qd012.vob") {
+			// Jack agrees to totemization.
+			amplification = 10.0;
+		} else if (tmpFileName == "g000d981.vob") {
+			// The Enterprise logo. Has no low-res version. Its
+			// volume is louder than the other logo animations.
+			amplification = 6.2;
+		} else if (tmpFileName.hasPrefix("g000d")) {
+			// The Dolby Digital and Activision logos. They have no
+			// low-res versions, but I've used the low-resolution
+			// Activision logo (slightly different) as reference.
+			amplification = 8.5;
+		}
+		animation = new Video::MPEGPSDecoder(amplification);
+	}
 #endif
 	else
 		error("Unknown suffix for animation %s", fileName.c_str());