add fade in/out presets

When using to_black and fade_out, currently you need to adjust in and
out properties as needed because we cannot yet use negative values to
mean "from end."

diff --git a/presets/filter/brightness/from_black b/presets/filter/brightness/from_black
new file mode 100644 (file)
index 0000000..73701b0
--- /dev/null
+++ b/presets/filter/brightness/from_black
@@ -0,0 +1,4 @@
+out=50
+in=0
+start=0
+end=1

diff --git a/presets/filter/brightness/to_black b/presets/filter/brightness/to_black
new file mode 100644 (file)
index 0000000..0b33a20
--- /dev/null
+++ b/presets/filter/brightness/to_black
@@ -0,0 +1,4 @@
+out=50
+in=0
+start=1
+end=0

diff --git a/presets/filter/volume/fade_in b/presets/filter/volume/fade_in
new file mode 100644 (file)
index 0000000..eabcf7e
--- /dev/null
+++ b/presets/filter/volume/fade_in
@@ -0,0 +1,4 @@
+out=50
+in=0
+gain=0
+end=1

diff --git a/presets/filter/volume/fade_out b/presets/filter/volume/fade_out
new file mode 100644 (file)
index 0000000..4531fc4
--- /dev/null
+++ b/presets/filter/volume/fade_out
@@ -0,0 +1,4 @@
+out=50
+in=0
+gain=1
+end=0