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.

2 files changed, 9 insertions, 6 deletions

diff --git a/video/mpegps_decoder.cpp b/video/mpegps_decoder.cpp
index 361481b739..9b232ec792 100644
--- a/video/mpegps_decoder.cpp
+++ b/video/mpegps_decoder.cpp
@@ -50,7 +50,8 @@ enum {
 	kStartCodePrivateStream2 = 0x1BF
 };
 
-MPEGPSDecoder::MPEGPSDecoder() {
+MPEGPSDecoder::MPEGPSDecoder(double decibel) {
+	_decibel = decibel;
 	_demuxer = new MPEGPSDemuxer();
 }
 
@@ -104,7 +105,7 @@ MPEGPSDecoder::MPEGStream *MPEGPSDecoder::getStream(uint32 startCode, Common::Se
 
 #ifdef USE_A52
 				handled = true;
-				AC3AudioTrack *ac3Track = new AC3AudioTrack(*packet, getSoundType());
+				AC3AudioTrack *ac3Track = new AC3AudioTrack(*packet, _decibel, getSoundType());
 				stream = ac3Track;
 				_streamMap[startCode] = ac3Track;
 				addTrack(ac3Track);
@@ -704,9 +705,9 @@ Audio::AudioStream *MPEGPSDecoder::MPEGAudioTrack::getAudioStream() const {
 
 #ifdef USE_A52
 
-MPEGPSDecoder::AC3AudioTrack::AC3AudioTrack(Common::SeekableReadStream &firstPacket, Audio::Mixer::SoundType soundType) :
+MPEGPSDecoder::AC3AudioTrack::AC3AudioTrack(Common::SeekableReadStream &firstPacket, double decibel, Audio::Mixer::SoundType soundType) :
 		AudioTrack(soundType) {
-	_audStream = Audio::makeAC3Stream(firstPacket);
+	_audStream = Audio::makeAC3Stream(firstPacket, decibel);
 	if (!_audStream)
 		error("Could not create AC-3 stream");
 }
diff --git a/video/mpegps_decoder.h b/video/mpegps_decoder.h
index bd703a35ff..7960639d78 100644
--- a/video/mpegps_decoder.h
+++ b/video/mpegps_decoder.h
@@ -54,7 +54,7 @@ namespace Video {
  */
 class MPEGPSDecoder : public VideoDecoder {
 public:
-	MPEGPSDecoder();
+	MPEGPSDecoder(double decibel = 0.0);
 	virtual ~MPEGPSDecoder();
 
 	bool loadStream(Common::SeekableReadStream *stream);
@@ -166,7 +166,7 @@ private:
 #ifdef USE_A52
 	class AC3AudioTrack : public AudioTrack, public MPEGStream {
 	public:
-		AC3AudioTrack(Common::SeekableReadStream &firstPacket, Audio::Mixer::SoundType soundType);
+		AC3AudioTrack(Common::SeekableReadStream &firstPacket, double decibel, Audio::Mixer::SoundType soundType);
 		~AC3AudioTrack();
 
 		bool sendPacket(Common::SeekableReadStream *packet, uint32 pts, uint32 dts);
@@ -199,6 +199,8 @@ private:
 	// A map from stream types to stream handlers
 	typedef Common::HashMap<int, MPEGStream *> StreamMap;
 	StreamMap _streamMap;
+
+	double _decibel;
 };
 
 } // End of namespace Video