Fix T39607: Audio not in synch when the blend file loads.

The problem here was that animation buffers got initialized with zeros in the beginning for unknown parts. Now it gets initialized with the first known value.
The bug's result was that the animation of the pitch started with 0 on first playback and thus any seeking while the pitch is zero resulted in seeking to the beginning.

intern/audaspace/intern/AUD_AnimateableProperty.cpp

@@ -47,6 +47,23 @@ AUD_AnimateableProperty::AUD_AnimateableProperty(int count) :
 	pthread_mutexattr_destroy(&attr);
 }
 
+AUD_AnimateableProperty::AUD_AnimateableProperty(int count, float value) :
+	AUD_Buffer(count * sizeof(float)), m_count(count), m_isAnimated(false)
+{
+	sample_t* buf = getBuffer();
+
+	for(int i = 0; i < count; i++)
+		buf[i] = value;
+
+	pthread_mutexattr_t attr;
+	pthread_mutexattr_init(&attr);
+	pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+
+	pthread_mutex_init(&m_mutex, &attr);
+
+	pthread_mutexattr_destroy(&attr);
+}
+
 void AUD_AnimateableProperty::updateUnknownCache(int start, int end)
 {
 	float* buf = getBuffer();
@@ -104,7 +121,8 @@ void AUD_AnimateableProperty::write(const float* data, int position, int count)
 
 		if(pos == 0)
 		{
-			memset(buf, 0, position * m_count * sizeof(float));
+			for(int i = 0; i < position; i++)
+				memcpy(buf + i * m_count, data, m_count * sizeof(float));
 		}
 		else
 			updateUnknownCache(pos, position - 1);

intern/audaspace/intern/AUD_AnimateableProperty.h

@@ -75,6 +75,13 @@ public:
 	 */
 	AUD_AnimateableProperty(int count = 1);
 
+	/**
+	 * Creates a new animateable property.
+	 * \param count The count of floats for a single property.
+	 * \param count The value that the property should get initialized with. All count floats will be initialized to the same value.
+	 */
+	AUD_AnimateableProperty(int count, float value);
+
 	/**
 	 * Destroys the animateable property.
 	 */

intern/audaspace/intern/AUD_Sequencer.cpp

@@ -42,6 +42,7 @@ AUD_Sequencer::AUD_Sequencer(AUD_Specs specs, float fps, bool muted) :
 	m_speed_of_sound(434),
 	m_doppler_factor(1),
 	m_distance_model(AUD_DISTANCE_MODEL_INVERSE_CLAMPED),
+	m_volume(1, 1.0f),
 	m_location(3),
 	m_orientation(4)
 {

intern/audaspace/intern/AUD_SequencerEntry.cpp

@@ -53,6 +53,8 @@ AUD_SequencerEntry::AUD_SequencerEntry(boost::shared_ptr<AUD_IFactory> sound, fl
 	m_cone_angle_outer(360),
 	m_cone_angle_inner(360),
 	m_cone_volume_outer(0),
+	m_volume(1, 1.0f),
+	m_pitch(1, 1.0f),
 	m_location(3),
 	m_orientation(4)
 {

source/blender/blenkernel/intern/sound.c

@@ -566,8 +566,6 @@ void sound_play_scene(struct Scene *scene)
 			AUD_unlock();
 			return;
 		}
-
-		AUD_seek(scene->sound_scene_handle, cur_time);
 	}
 
 	if (status != AUD_STATUS_PLAYING) {