2.5 Audio:

- Python script to crossfade two sound strips in the sequencer
- Fix for the libsamplerate code producing awful audio when resampling sequencer strips
- Changed default resampler to a linear one (as temporary workaround for a bug that seems to be in the samplerate code)
- Fix for the OpenAL device to return a more accurate playback position

intern/audaspace/OpenAL/AUD_OpenALDevice.cpp

@@ -890,11 +890,14 @@ float AUD_OpenALDevice::getPosition(AUD_Handle* handle)
 	if(isValid(handle))
 	{
 		AUD_OpenALHandle* h = (AUD_OpenALHandle*)handle;
-		if(h->isBuffered)
 		alGetSourcef(h->source, AL_SEC_OFFSET, &position);
-		else
-			position = h->reader->getPosition() /
-					   (float)h->reader->getSpecs().rate;
+		if(!h->isBuffered)
+		{
+			AUD_Specs specs = h->reader->getSpecs();
+			position += (h->reader->getPosition() - m_buffersize *
+									AUD_OPENAL_CYCLE_BUFFERS / specs.channels) /
+					   (float)specs.rate;
+		}
 	}
 
 	unlock();

intern/audaspace/SRC/AUD_SRCResampleReader.cpp

@@ -44,6 +44,7 @@ AUD_SRCResampleReader::AUD_SRCResampleReader(AUD_IReader* reader,
 	m_tspecs = specs;
 	m_tspecs.channels = m_sspecs.channels;
 	m_factor = (double)m_tspecs.rate / (double)m_sspecs.rate;
+	m_position = 0;
 
 	int error;
 	m_src = src_callback_new(src_callback,
@@ -71,7 +72,7 @@ AUD_SRCResampleReader::~AUD_SRCResampleReader()
 
 long AUD_SRCResampleReader::doCallback(float** data)
 {
-	int length = m_buffer->getSize() / 4 / m_tspecs.channels;
+	int length = m_buffer->getSize() / AUD_SAMPLE_SIZE(m_tspecs);
 	sample_t* buffer;
 
 	m_reader->read(length, buffer);
@@ -84,6 +85,7 @@ void AUD_SRCResampleReader::seek(int position)
 {
 	m_reader->seek(position / m_factor);
 	src_reset(m_src);
+	m_position = position;
 }
 
 int AUD_SRCResampleReader::getLength()
@@ -93,7 +95,7 @@ int AUD_SRCResampleReader::getLength()
 
 int AUD_SRCResampleReader::getPosition()
 {
-	return m_reader->getPosition() * m_factor;
+	return m_position;
 }
 
 AUD_Specs AUD_SRCResampleReader::getSpecs()
@@ -111,4 +113,6 @@ void AUD_SRCResampleReader::read(int & length, sample_t* & buffer)
 	buffer = m_buffer->getBuffer();
 
 	length = src_callback_read(m_src, m_factor, length, buffer);
+
+	m_position += length;
 }

intern/audaspace/SRC/AUD_SRCResampleReader.h

@@ -62,6 +62,11 @@ private:
 	 */
 	SRC_STATE* m_src;
 
+	/**
+	 * The current playback position;
+	 */
+	int m_position;
+
 public:
 	/**
 	 * Creates a resampling reader.

intern/audaspace/intern/AUD_C-API.cpp

@@ -762,3 +762,16 @@ int AUD_readSound(AUD_Sound* sound, sample_t* buffer, int length)
 
 	return length;
 }
+
+#ifdef AUD_DEBUG_MEMORY
+int AUD_References(int count, const char* text)
+{
+	static int m_count = 0;
+	m_count += count;
+	if(count > 0)
+		printf("+%s\n", text);
+	if(count < 0)
+		printf("-%s\n", text);
+	return m_count;
+}
+#endif

intern/audaspace/intern/AUD_Mixer.cpp

@@ -25,6 +25,7 @@
 
 #include "AUD_Mixer.h"
 #include "AUD_SRCResampleFactory.h"
+#include "AUD_LinearResampleFactory.h"
 #include "AUD_ChannelMapperFactory.h"
 #include "AUD_IReader.h"
 #include "AUD_Buffer.h"
@@ -86,7 +87,7 @@ void AUD_Mixer::setSpecs(AUD_DeviceSpecs specs)
 		delete m_mapper; AUD_DELETE("factory")
 	}
 
-	m_resampler = new AUD_SRCResampleFactory(specs); AUD_NEW("factory")
+	m_resampler = new AUD_MIXER_RESAMPLER(specs); AUD_NEW("factory")
 	m_mapper = new AUD_ChannelMapperFactory(specs); AUD_NEW("factory")
 
 	int bigendian = 1;

intern/audaspace/intern/AUD_Mixer.h

@@ -26,9 +26,11 @@
 #ifndef AUD_MIXER
 #define AUD_MIXER
 
+#define AUD_MIXER_RESAMPLER AUD_LinearResampleFactory
+
 #include "AUD_ConverterFunctions.h"
 class AUD_ConverterFactory;
-class AUD_SRCResampleFactory;
+class AUD_MIXER_RESAMPLER;
 class AUD_ChannelMapperFactory;
 class AUD_Buffer;
 class AUD_IReader;
@@ -54,7 +56,7 @@ private:
 	/**
 	 * The resampling factory that resamples all readers for superposition.
 	 */
-	AUD_SRCResampleFactory* m_resampler;
+	AUD_MIXER_RESAMPLER* m_resampler;
 
 	/**
 	 * The channel mapper factory that maps all readers for superposition.

intern/audaspace/intern/AUD_SequencerReader.cpp

@@ -100,13 +100,17 @@ void AUD_SequencerReader::add(AUD_SequencerEntry* entry)
 {
 	AUD_SequencerStrip* strip = new AUD_SequencerStrip; AUD_NEW("seqstrip")
 	strip->entry = entry;
-	strip->old_sound = NULL;
 
-	if(strip->old_sound)
+	if(*strip->entry->sound)
+	{
+		strip->old_sound = *strip->entry->sound;
 		strip->reader = m_mixer.prepare(strip->old_sound->createReader());
+	}
 	else
+	{
 		strip->reader = NULL;
-
+		strip->old_sound = NULL;
+	}
 	m_strips.push_front(strip);
 }
 
@@ -124,7 +128,7 @@ void AUD_SequencerReader::remove(AUD_SequencerEntry* entry)
 				delete strip->reader; AUD_DELETE("reader")
 			}
 			m_strips.remove(strip);
-			delete strip;
+			delete strip; AUD_DELETE("seqstrip")
 			return;
 		}
 	}

intern/audaspace/intern/AUD_Space.h

@@ -97,7 +97,7 @@
 //#define AUD_DEBUG_MEMORY
 
 #ifdef AUD_DEBUG_MEMORY
-int AUD_References(int count = 0, const char* text = "");
+extern int AUD_References(int count, const char* text);
 #define AUD_NEW(text) AUD_References(1, text);
 #define AUD_DELETE(text) AUD_References(-1, text);
 #else

release/scripts/op/sequencer.py

@@ -0,0 +1,76 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
+import bpy
+
+class SequencerCrossfadeSounds(bpy.types.Operator):
+    '''Do crossfading volume animation of two selected sound strips.'''
+
+    bl_idname = "sequencer.crossfade_sounds"
+    bl_label = "Crossfade sounds"
+    bl_register = True
+    bl_undo = True
+
+    def poll(self, context):
+        if context.scene and context.scene.sequence_editor and context.scene.sequence_editor.active_strip:
+            return context.scene.sequence_editor.active_strip.type == 'SOUND'
+        else:
+            return False
+
+    def execute(self, context):
+        seq1 = None
+        seq2 = None
+        for s in context.scene.sequence_editor.sequences:
+            if s.selected and s.type == 'SOUND':
+                if seq1 == None:
+                    seq1 = s
+                elif seq2 == None:
+                    seq2 = s
+                else:
+                    seq2 = None
+                    break
+        if seq2 == None:
+            self.report({'ERROR'}, "Select 2 sound strips.")
+            return {'CANCELLED'}
+        if seq1.start_frame_final > seq2.start_frame_final:
+            s = seq1
+            seq1 = seq2
+            seq2 = s
+        if seq1.end_frame_final > seq2.start_frame_final:
+            tempcfra = context.scene.current_frame
+            context.scene.current_frame = seq2.start_frame_final
+            seq1.keyframe_insert('volume')
+            context.scene.current_frame = seq1.end_frame_final
+            seq1.volume = 0
+            seq1.keyframe_insert('volume')
+            seq2.keyframe_insert('volume')
+            context.scene.current_frame = seq2.start_frame_final
+            seq2.volume = 0
+            seq2.keyframe_insert('volume')
+            context.scene.current_frame = tempcfra
+            return {'FINISHED'}
+        else:
+            self.report({'ERROR'}, "The selected strips don't overlap.")
+            return {'CANCELLED'}
+
+bpy.types.register(SequencerCrossfadeSounds)
+
+if __name__ == "__main__":
+    bpy.ops.sequencer.crossfade_sounds()