From e5ffc7847cb70f792b4658aa032959949e849669 Mon Sep 17 00:00:00 2001
From: Florian Kagerer
Date: Wed, 4 Aug 2010 16:53:09 +0000
Subject: AUDIO: Implement volume and balance control for the AudioCD manager
 (needed for music fading in Kyra 1 FM-Towns and probably other FM-Towns
 games). This addition applies to emulated CD audio only for now.  I haven't
 found a way to implement this for real CDs yet. SDL doesn't seem to support
 this (but it might be just me? If anyone knows more about this, just tell
 me).

svn-id: r51741
---
 sound/audiocd.cpp | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

(limited to 'sound/audiocd.cpp')

diff --git a/sound/audiocd.cpp b/sound/audiocd.cpp
index 7afbd12d03..625def58fe 100644
--- a/sound/audiocd.cpp
+++ b/sound/audiocd.cpp
@@ -42,6 +42,8 @@ AudioCDManager::AudioCDManager() {
 	_cd.start = 0;
 	_cd.duration = 0;
 	_cd.numLoops = 0;
+	_cd.volume = Mixer::kMaxChannelVolume;
+	_cd.balance = 0;
 	_mixer = g_system->getMixer();
 	_emulating = false;
 	assert(_mixer);
@@ -79,7 +81,8 @@ void AudioCDManager::play(int track, int numLoops, int startFrame, int duration,
 			*/
 			_emulating = true;
 			_mixer->playStream(Mixer::kMusicSoundType, &_handle,
-			                        makeLoopingAudioStream(stream, start, end, (numLoops < 1) ? numLoops + 1 : numLoops));
+			                        makeLoopingAudioStream(stream, start, end, (numLoops < 1) ? numLoops + 1 : numLoops), -1, _cd.volume, _cd.balance);
+
 		} else {
 			_emulating = false;
 			if (!only_emulate)
@@ -109,6 +112,38 @@ bool AudioCDManager::isPlaying() const {
 	}
 }
 
+void AudioCDManager::setVolume(byte volume) {
+	_cd.volume = volume;
+	if (_emulating) {
+		// Audio CD emulation
+		if (_mixer->isSoundHandleActive(_handle))
+			_mixer->setChannelVolume(_handle, _cd.volume);
+	} else {
+		// Real Audio CD
+		
+		// Unfortunately I can't implement this atm
+		// since SDL doesn't seem to offer an interface method for this.
+
+		// g_system->setVolumeCD(_cd.volume);
+	}
+}
+
+void AudioCDManager::setBalance(int8 balance) {
+	_cd.balance = balance;
+	if (_emulating) {
+		// Audio CD emulation
+		if (isPlaying())
+			_mixer->setChannelBalance(_handle, _cd.balance);
+	} else {
+		// Real Audio CD
+		
+		// Unfortunately I can't implement this atm
+		// since SDL doesn't seem to offer an interface method for this.
+
+		// g_system->setBalanceCD(_cd.balance);
+	}
+}
+
 void AudioCDManager::updateCD() {
 	if (_emulating) {
 		// Check whether the audio track stopped playback
-- 
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