3D Audio GSoC:

Implemented basic audio animation.

* AnimatableProperty: Propper cache writing and spline interpolation for reading (the solution for stair steps in audio animation)
* Animatable properties so far are: volume, pitch, panning
* Users note: Changing the pitch of a sound results in wrong seeking, due to the resulting playback length difference.
* Users note: Panning only works for mono sources, values are in the range [-2..2], this basically controls the angle of the sound, 0 is front, -1 left, 1 right and 2 and -2 are back. Typical stereo panning only supports [-1..1].
* Disabled animation of audio related ffmpeg output parameters.
* Scene Audio Panel: 3D Listener settings also for Renderer, new Volume property (animatable!), Update/Bake buttons for animation problems, moved sampling rate and channel count here

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_sequence_types.h b/source/blender/makesdna/DNA_sequence_types.h
index b9bea7a89b0..aa04dc9ac13 100644
--- a/source/blender/makesdna/DNA_sequence_types.h
+++ b/source/blender/makesdna/DNA_sequence_types.h
@@ -155,7 +155,7 @@ typedef struct Sequence {
 	void *scene_sound;
 	float volume;
 
-	float level, pan;	/* level in dB (0=full), pan -1..1 */
+	float pitch, pan;	/* pitch (-0.1..10), pan -2..2 */
 	int scenenr;          /* for scene selection */
 	int multicam_source;  /* for multicam source selection */
 	float strobe;
@@ -284,6 +284,11 @@ typedef struct SpeedControlVars {
 #define SEQ_USE_PROXY_CUSTOM_FILE   (1<<21)
 #define SEQ_USE_EFFECT_DEFAULT_FADE (1<<22)
 
+// flags for whether those properties are animated or not
+#define SEQ_AUDIO_VOLUME_ANIMATED   (1<<24)
+#define SEQ_AUDIO_PITCH_ANIMATED    (1<<25)
+#define SEQ_AUDIO_PAN_ANIMATED      (1<<26)
+
 #define SEQ_INVALID_EFFECT          (1<<31)
 
 /* convenience define for all selection flags */