added general fading (for fade-out)

it must be tested on MacOS and Linux.
a more general fading function would be better (with "fade to pause" and "fade to end").

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2672 b956fd51-792f-4845-bead-9b4dfca2ff2c

4 files changed, 30 insertions, 0 deletions

diff --git a/medley_new/src/media/UAudioPlaybackBase.pas b/medley_new/src/media/UAudioPlaybackBase.pas
index 5f317257..58f0b85d 100644
--- a/medley_new/src/media/UAudioPlaybackBase.pas
+++ b/medley_new/src/media/UAudioPlaybackBase.pas
@@ -60,6 +60,7 @@ type
       procedure Pause;
       procedure Stop;
       procedure FadeIn(Time: real; TargetVolume: single);
+      procedure Fade(Time: real; TargetVolume: single);
 
       procedure SetSyncSource(SyncSource: TSyncSource);
 
@@ -260,6 +261,12 @@ begin
     MusicStream.FadeIn(Time, TargetVolume);
 end;
 
+procedure TAudioPlaybackBase.Fade(Time: real; TargetVolume: single);
+begin
+  if assigned(MusicStream) then
+    MusicStream.Fade(Time, TargetVolume);
+end;
+
 procedure TAudioPlaybackBase.SetLoop(Enabled: boolean);
 begin
   if assigned(MusicStream) then
diff --git a/medley_new/src/media/UAudioPlayback_Bass.pas b/medley_new/src/media/UAudioPlayback_Bass.pas
index 1d7a44dc..8e1e5a9f 100644
--- a/medley_new/src/media/UAudioPlayback_Bass.pas
+++ b/medley_new/src/media/UAudioPlayback_Bass.pas
@@ -81,6 +81,7 @@ type
       procedure Pause();                    override;
       procedure Stop();                     override;
       procedure FadeIn(Time: real; TargetVolume: single); override;
+      procedure Fade(Time: real; TargetVolume: single); override;
 
       procedure AddSoundEffect(Effect: TSoundEffect);    override;
       procedure RemoveSoundEffect(Effect: TSoundEffect); override;
@@ -339,6 +340,12 @@ begin
   BASS_ChannelSlideAttribute(Handle, BASS_ATTRIB_VOL, TargetVolume, Trunc(Time * 1000));
 end;
 
+procedure TBassPlaybackStream.Fade(Time: real; TargetVolume: single);
+begin
+  // start fade-in: slide from fadeStart- to fadeEnd-volume in FadeTime
+  BASS_ChannelSlideAttribute(Handle, BASS_ATTRIB_VOL, TargetVolume, Trunc(Time * 1000));
+end;
+
 procedure TBassPlaybackStream.Pause();
 begin
   BASS_ChannelPause(Handle);
diff --git a/medley_new/src/media/UAudioPlayback_SoftMixer.pas b/medley_new/src/media/UAudioPlayback_SoftMixer.pas
index 11df4df5..ac65fd68 100644
--- a/medley_new/src/media/UAudioPlayback_SoftMixer.pas
+++ b/medley_new/src/media/UAudioPlayback_SoftMixer.pas
@@ -101,6 +101,7 @@ type
       procedure Pause();                    override;
       procedure Stop();                     override;
       procedure FadeIn(Time: real; TargetVolume: single); override;
+      procedure Fade(Time: real; TargetVolume: single); override;
 
       function GetAudioFormatInfo(): TAudioFormatInfo; override;
 
@@ -479,6 +480,16 @@ begin
   Play();
 end;
 
+procedure TGenericPlaybackStream.Fade(Time: real; TargetVolume: single);
+begin
+  (* TODO: test
+  FadeInTime := Trunc(Time * 1000);
+  FadeInStartTime := SDL_GetTicks();
+  FadeInStartVolume := fVolume;
+  FadeInTargetVolume := TargetVolume;
+  *)
+end;
+
 procedure TGenericPlaybackStream.Pause();
 var
   Mixer: TAudioMixerStream;
diff --git a/medley_new/src/media/UMedia_dummy.pas b/medley_new/src/media/UMedia_dummy.pas
index 46cbe6b8..6bae58ec 100644
--- a/medley_new/src/media/UMedia_dummy.pas
+++ b/medley_new/src/media/UMedia_dummy.pas
@@ -79,6 +79,7 @@ type
 
       function GetOutputDeviceList(): TAudioOutputDeviceList;
       procedure FadeIn(Time: real; TargetVolume: single);
+      procedure Fade(Time: real; TargetVolume: single);
       procedure SetAppVolume(Volume: single);
       procedure SetVolume(Volume: single);
       procedure Rewind;
@@ -286,6 +287,10 @@ procedure TAudio_Dummy.FadeIn(Time: real; TargetVolume: single);
 begin
 end;
 
+procedure TAudio_Dummy.Fade(Time: real; TargetVolume: single);
+begin
+end;
+
 procedure TAudio_Dummy.Rewind;
 begin
 end;