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, 3 deletions

diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 937c33d6a65..b39f0a68854 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -149,6 +149,8 @@ typedef struct AudioData {
 	int distance_model;
 	short flag;
 	short pad;
+	float volume;
+	float pad2;
 } AudioData;
 
 typedef struct SceneRenderLayer {
@@ -1131,9 +1133,10 @@ typedef struct Scene {
 #define F_DUPLI			3
 
 /* audio->flag */
-#define AUDIO_MUTE		1
-#define AUDIO_SYNC		2
-#define AUDIO_SCRUB		4
+#define AUDIO_MUTE                (1<<0)
+#define AUDIO_SYNC                (1<<1)
+#define AUDIO_SCRUB		          (1<<2)
+#define AUDIO_VOLUME_ANIMATED     (1<<3)
 
 #define FFMPEG_MULTIPLEX_AUDIO  1 /* deprecated, you can choose none as audiocodec now */
 #define FFMPEG_AUTOSPLIT_OUTPUT 2