3D Audio GSoC:

- Sequencer dynamics: Now it's possible to change the output channels and the resampling quality also increased (previously maximum quality was 44,1 kHz)
- Changed two buffers to use ffmpeg allocation, not sure if that helps somehow.

21 files changed, 117 insertions, 30 deletions

diff --git a/intern/audaspace/intern/AUD_C-API.cpp b/intern/audaspace/intern/AUD_C-API.cpp
index b52243c3fe0..db76b9b4faf 100644
--- a/intern/audaspace/intern/AUD_C-API.cpp
+++ b/intern/audaspace/intern/AUD_C-API.cpp
@@ -882,16 +882,11 @@ AUD_Handle* AUD_pauseAfter(AUD_Handle* handle, float seconds)
 
 AUD_Sound* AUD_createSequencer(int muted, void* data, AUD_volumeFunction volume)
 {
-/* AUD_XXX should be this: but AUD_createSequencer is called before the device
- * is initialized.
-
-	return new AUD_SequencerFactory(AUD_device->getSpecs().specs, data, volume);
-*/
+	// specs are changed at a later point!
 	AUD_Specs specs;
 	specs.channels = AUD_CHANNELS_STEREO;
 	specs.rate = AUD_RATE_44100;
 	AUD_Reference<AUD_SequencerFactory>* sequencer = new AUD_Reference<AUD_SequencerFactory>(new AUD_SequencerFactory(specs, muted, data, volume));
-	(*sequencer)->setThis(sequencer);
 	return reinterpret_cast<AUD_Sound*>(sequencer);
 }
 
@@ -928,6 +923,16 @@ void AUD_muteSequencer(AUD_Sound* sequencer, AUD_Reference<AUD_SequencerEntry>*
 	((AUD_SequencerFactory*)sequencer->get())->mute(*entry, mute);
 }
 
+void AUD_setSequencerDeviceSpecs(AUD_Sound* sequencer)
+{
+	((AUD_SequencerFactory*)sequencer->get())->setSpecs(AUD_device->getSpecs().specs);
+}
+
+void AUD_setSequencerSpecs(AUD_Sound* sequencer, AUD_Specs specs)
+{
+	((AUD_SequencerFactory*)sequencer->get())->setSpecs(specs);
+}
+
 int AUD_readSound(AUD_Sound* sound, sample_t* buffer, int length)
 {
 	AUD_DeviceSpecs specs;
diff --git a/intern/audaspace/intern/AUD_C-API.h b/intern/audaspace/intern/AUD_C-API.h
index b818140a571..72d423e847b 100644
--- a/intern/audaspace/intern/AUD_C-API.h
+++ b/intern/audaspace/intern/AUD_C-API.h
@@ -469,6 +469,10 @@ extern void AUD_moveSequencer(AUD_Sound* sequencer, AUD_SEntry* entry,
 extern void AUD_muteSequencer(AUD_Sound* sequencer, AUD_SEntry* entry,
 						  char mute);
 
+extern void AUD_setSequencerDeviceSpecs(AUD_Sound* sequencer);
+
+extern void AUD_setSequencerSpecs(AUD_Sound* sequencer, AUD_Specs specs);
+
 extern int AUD_readSound(AUD_Sound* sound, sample_t* buffer, int length);
 
 extern void AUD_startPlayback(void);
diff --git a/intern/audaspace/intern/AUD_ChannelMapperReader.cpp b/intern/audaspace/intern/AUD_ChannelMapperReader.cpp
index ab7b5317be1..4ac1982e32c 100644
--- a/intern/audaspace/intern/AUD_ChannelMapperReader.cpp
+++ b/intern/audaspace/intern/AUD_ChannelMapperReader.cpp
@@ -44,6 +44,12 @@ AUD_ChannelMapperReader::~AUD_ChannelMapperReader()
 	delete[] m_mapping;
 }
 
+void AUD_ChannelMapperReader::setChannels(AUD_Channels channels)
+{
+	m_target_channels = channels;
+	calculateMapping();
+}
+
 float AUD_ChannelMapperReader::angleDistance(float alpha, float beta)
 {
 	alpha = fabs(alpha - beta);
diff --git a/intern/audaspace/intern/AUD_ChannelMapperReader.h b/intern/audaspace/intern/AUD_ChannelMapperReader.h
index 949bb4427e2..3da34ed85ce 100644
--- a/intern/audaspace/intern/AUD_ChannelMapperReader.h
+++ b/intern/audaspace/intern/AUD_ChannelMapperReader.h
@@ -109,6 +109,8 @@ public:
 	 */
 	~AUD_ChannelMapperReader();
 
+	void setChannels(AUD_Channels channels);
+
 	virtual AUD_Specs getSpecs() const;
 	virtual void read(int& length, bool& eos, sample_t* buffer);
 };
diff --git a/intern/audaspace/intern/AUD_Mixer.cpp b/intern/audaspace/intern/AUD_Mixer.cpp
index e6699811344..cfdf2b0e60a 100644
--- a/intern/audaspace/intern/AUD_Mixer.cpp
+++ b/intern/audaspace/intern/AUD_Mixer.cpp
@@ -73,6 +73,11 @@ AUD_DeviceSpecs AUD_Mixer::getSpecs() const
 	return m_specs;
 }
 
+void AUD_Mixer::setSpecs(AUD_Specs specs)
+{
+	m_specs.specs = specs;
+}
+
 void AUD_Mixer::clear(int length)
 {
 	m_buffer.assureSize(length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));
diff --git a/intern/audaspace/intern/AUD_Mixer.h b/intern/audaspace/intern/AUD_Mixer.h
index a68d86dcb83..5ca801b1690 100644
--- a/intern/audaspace/intern/AUD_Mixer.h
+++ b/intern/audaspace/intern/AUD_Mixer.h
@@ -47,7 +47,7 @@ protected:
 	/**
 	 * The output specification.
 	 */
-	const AUD_DeviceSpecs m_specs;
+	AUD_DeviceSpecs m_specs;
 
 	/**
 	 * The length of the mixing buffer.
@@ -82,6 +82,12 @@ public:
 	AUD_DeviceSpecs getSpecs() const;
 
 	/**
+	 * Sets the target specification for superposing.
+	 * \param specs The target specification.
+	 */
+	void setSpecs(AUD_Specs specs);
+
+	/**
 	 * Mixes a buffer.
 	 * \param buffer The buffer to superpose.
 	 * \param start The start sample of the buffer.
diff --git a/intern/audaspace/intern/AUD_SequencerFactory.cpp b/intern/audaspace/intern/AUD_SequencerFactory.cpp
index 1787dea0ebb..6907d7683c9 100644
--- a/intern/audaspace/intern/AUD_SequencerFactory.cpp
+++ b/intern/audaspace/intern/AUD_SequencerFactory.cpp
@@ -48,9 +48,12 @@ AUD_SequencerFactory::~AUD_SequencerFactory()
 {
 }
 
-void AUD_SequencerFactory::setThis(AUD_Reference<AUD_SequencerFactory>* self)
+void AUD_SequencerFactory::setSpecs(AUD_Specs specs)
 {
-	m_this = self;
+	m_specs = specs;
+
+	for(AUD_ReaderIterator i = m_readers.begin(); i != m_readers.end(); i++)
+		(*i)->setSpecs(m_specs);
 }
 
 void AUD_SequencerFactory::mute(bool muted)
@@ -103,7 +106,7 @@ void AUD_SequencerFactory::mute(AUD_Reference<AUD_SequencerEntry> entry, bool mu
 
 AUD_Reference<AUD_IReader> AUD_SequencerFactory::createReader()
 {
-	AUD_Reference<AUD_SequencerReader> reader = new AUD_SequencerReader(*m_this, m_entries,
+	AUD_Reference<AUD_SequencerReader> reader = new AUD_SequencerReader(this, m_entries,
 														  m_specs, m_data,
 														  m_volume);
 	m_readers.push_front(reader);
diff --git a/intern/audaspace/intern/AUD_SequencerFactory.h b/intern/audaspace/intern/AUD_SequencerFactory.h
index 37a332bc9ff..4e57a224c65 100644
--- a/intern/audaspace/intern/AUD_SequencerFactory.h
+++ b/intern/audaspace/intern/AUD_SequencerFactory.h
@@ -66,7 +66,6 @@ private:
 	bool m_muted;
 	void* m_data;
 	AUD_volumeFunction m_volume;
-	AUD_Reference<AUD_SequencerFactory>* m_this;
 
 	// hide copy constructor and operator=
 	AUD_SequencerFactory(const AUD_SequencerFactory&);
@@ -76,7 +75,7 @@ public:
 	AUD_SequencerFactory(AUD_Specs specs, bool muted, void* data, AUD_volumeFunction volume);
 	~AUD_SequencerFactory();
 
-	void setThis(AUD_Reference<AUD_SequencerFactory>* self);
+	void setSpecs(AUD_Specs specs);
 
 	void mute(bool muted);
 	bool getMute() const;
diff --git a/intern/audaspace/intern/AUD_SequencerReader.cpp b/intern/audaspace/intern/AUD_SequencerReader.cpp
index 9ee0b39c50d..a9309311d6a 100644
--- a/intern/audaspace/intern/AUD_SequencerReader.cpp
+++ b/intern/audaspace/intern/AUD_SequencerReader.cpp
@@ -95,6 +95,22 @@ void AUD_SequencerReader::remove(AUD_Reference<AUD_SequencerEntry> entry)
 	}
 }
 
+void AUD_SequencerReader::setSpecs(AUD_Specs specs)
+{
+	m_mixer->setSpecs(specs);
+
+	AUD_Reference<AUD_SequencerStrip> strip;
+	for(AUD_StripIterator i = m_strips.begin(); i != m_strips.end(); i++)
+	{
+		strip = *i;
+		if(!strip->mapper.isNull())
+		{
+			strip->mapper->setChannels(specs.channels);
+			strip->resampler->setRate(specs.rate);
+		}
+	}
+}
+
 bool AUD_SequencerReader::isSeekable() const
 {
 	return true;
@@ -149,24 +165,30 @@ void AUD_SequencerReader::read(int& length, bool& eos, sample_t* buffer)
 							strip->reader = (*strip->old_sound)->createReader();
 							// resample
 							#ifdef WITH_SAMPLERATE
-								strip->reader = new AUD_SRCResampleReader(strip->reader, m_mixer->getSpecs().specs);
+								strip->resampler = new AUD_SRCResampleReader(strip->reader, m_mixer->getSpecs().specs);
 							#else
-								strip->reader = new AUD_LinearResampleReader(strip->reader, m_mixer->getSpecs().specs);
+								strip->resampler = new AUD_LinearResampleReader(strip->reader, m_mixer->getSpecs().specs);
 							#endif
 
 							// rechannel
-							strip->reader = new AUD_ChannelMapperReader(strip->reader, m_mixer->getSpecs().channels);
+							strip->mapper = new AUD_ChannelMapperReader(AUD_Reference<AUD_IReader>(strip->resampler), m_mixer->getSpecs().channels);
 						}
 						catch(AUD_Exception)
 						{
 							strip->reader = NULL;
+							strip->resampler = NULL;
+							strip->mapper = NULL;
 						}
 					}
 					else
+					{
 						strip->reader = NULL;
+						strip->resampler = NULL;
+						strip->mapper = NULL;
+					}
 				}
 
-				if(!strip->reader.isNull())
+				if(!strip->mapper.isNull())
 				{
 					end = floor(strip->entry->end * rate);
 					if(m_position < end)
@@ -185,9 +207,9 @@ void AUD_SequencerReader::read(int& length, bool& eos, sample_t* buffer)
 							current += strip->entry->skip * rate;
 							len = length > end - m_position ? end - m_position : length;
 							len -= skip;
-							if(strip->reader->getPosition() != current)
-								strip->reader->seek(current);
-							strip->reader->read(len, eos, m_buffer.getBuffer());
+							if(strip->mapper->getPosition() != current)
+								strip->mapper->seek(current);
+							strip->mapper->read(len, eos, m_buffer.getBuffer());
 							m_mixer->mix(m_buffer.getBuffer(), skip, len, m_volume(m_data, strip->entry->data, (float)m_position / (float)rate));
 						}
 					}
diff --git a/intern/audaspace/intern/AUD_SequencerReader.h b/intern/audaspace/intern/AUD_SequencerReader.h
index e769b342d1b..625bad3c3ae 100644
--- a/intern/audaspace/intern/AUD_SequencerReader.h
+++ b/intern/audaspace/intern/AUD_SequencerReader.h
@@ -35,11 +35,15 @@
 #include "AUD_IReader.h"
 #include "AUD_SequencerFactory.h"
 #include "AUD_Buffer.h"
-class AUD_Mixer;
+#include "AUD_Mixer.h"
+#include "AUD_ResampleReader.h"
+#include "AUD_ChannelMapperReader.h"
 
 struct AUD_SequencerStrip
 {
 	AUD_Reference<AUD_IReader> reader;
+	AUD_Reference<AUD_ResampleReader> resampler;
+	AUD_Reference<AUD_ChannelMapperReader> mapper;
 	AUD_Reference<AUD_SequencerEntry> entry;
 	AUD_Reference<AUD_IFactory>* old_sound;
 };
@@ -94,6 +98,7 @@ public:
 
 	void add(AUD_Reference<AUD_SequencerEntry> entry);
 	void remove(AUD_Reference<AUD_SequencerEntry> entry);
+	void setSpecs(AUD_Specs specs);
 
 	virtual bool isSeekable() const;
 	virtual void seek(int position);
diff --git a/release/scripts/presets/ffmpeg/DV.py b/release/scripts/presets/ffmpeg/DV.py
index 46d2a0a4a2f..926fb241747 100644
--- a/release/scripts/presets/ffmpeg/DV.py
+++ b/release/scripts/presets/ffmpeg/DV.py
@@ -11,3 +11,4 @@ else:
 
 bpy.context.scene.render.ffmpeg_audio_mixrate = 48000
 bpy.context.scene.render.ffmpeg_audio_codec = "PCM"
+bpy.context.scene.render.ffmpeg_audio_channels = 2
diff --git a/release/scripts/presets/ffmpeg/DVD.py b/release/scripts/presets/ffmpeg/DVD.py
index e18ec9f817b..196b5d68406 100644
--- a/release/scripts/presets/ffmpeg/DVD.py
+++ b/release/scripts/presets/ffmpeg/DVD.py
@@ -21,3 +21,4 @@ bpy.context.scene.render.ffmpeg_muxrate = 10080000
 bpy.context.scene.render.ffmpeg_audio_codec = "AC3"
 bpy.context.scene.render.ffmpeg_audio_bitrate = 448
 bpy.context.scene.render.ffmpeg_audio_mixrate = 48000
+bpy.context.scene.render.ffmpeg_audio_channels = 6
diff --git a/release/scripts/presets/ffmpeg/SVCD.py b/release/scripts/presets/ffmpeg/SVCD.py
index c71a3851af0..e4459ab5c5c 100644
--- a/release/scripts/presets/ffmpeg/SVCD.py
+++ b/release/scripts/presets/ffmpeg/SVCD.py
@@ -21,3 +21,4 @@ bpy.context.scene.render.ffmpeg_muxrate = 0
 bpy.context.scene.render.ffmpeg_audio_bitrate = 224
 bpy.context.scene.render.ffmpeg_audio_mixrate = 44100
 bpy.context.scene.render.ffmpeg_audio_codec = "MP2"
+bpy.context.scene.render.ffmpeg_audio_channels = 2
diff --git a/release/scripts/presets/ffmpeg/VCD.py b/release/scripts/presets/ffmpeg/VCD.py
index faf27efe9e6..c2b73e682a2 100644
--- a/release/scripts/presets/ffmpeg/VCD.py
+++ b/release/scripts/presets/ffmpeg/VCD.py
@@ -21,3 +21,4 @@ bpy.context.scene.render.ffmpeg_muxrate = 2352 * 75 * 8
 bpy.context.scene.render.ffmpeg_audio_bitrate = 224
 bpy.context.scene.render.ffmpeg_audio_mixrate = 44100
 bpy.context.scene.render.ffmpeg_audio_codec = "MP2"
+bpy.context.scene.render.ffmpeg_audio_channels = 2
diff --git a/release/scripts/startup/bl_ui/properties_render.py b/release/scripts/startup/bl_ui/properties_render.py
index 54ca18ef828..9ff4470641b 100644
--- a/release/scripts/startup/bl_ui/properties_render.py
+++ b/release/scripts/startup/bl_ui/properties_render.py
@@ -596,7 +596,9 @@ class RENDER_PT_encoding(RenderButtonsPanel, bpy.types.Panel):
         col.prop(rd, "ffmpeg_audio_bitrate")
         col.prop(rd, "ffmpeg_audio_mixrate")
 
-        split.prop(rd, "ffmpeg_audio_volume", slider=True)
+        col = split.column()
+        col.prop(rd, "ffmpeg_audio_volume", slider=True)
+        col.prop(rd, "ffmpeg_audio_channels")
 
 
 class RENDER_PT_bake(RenderButtonsPanel, bpy.types.Panel):
diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 51eaba3c05b..e045bd0fb82 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -469,6 +469,7 @@ Scene *add_scene(const char *name)
 	sce->r.ffcodecdata.audio_mixrate = 44100;
 	sce->r.ffcodecdata.audio_volume = 1.0f;
 	sce->r.ffcodecdata.audio_bitrate = 192;
+	sce->r.ffcodecdata.audio_channels = 2;
 
 	BLI_strncpy(sce->r.engine, "BLENDER_RENDER", sizeof(sce->r.engine));
 
diff --git a/source/blender/blenkernel/intern/sound.c b/source/blender/blenkernel/intern/sound.c
index 60a24c2eace..9b86b8752db 100644
--- a/source/blender/blenkernel/intern/sound.c
+++ b/source/blender/blenkernel/intern/sound.c
@@ -346,6 +346,7 @@ AUD_Device* sound_mixdown(struct Scene *scene, AUD_DeviceSpecs specs, int start,
 
 	AUD_setDeviceVolume(mixdown, volume);
 
+	AUD_setSequencerSpecs(scene->sound_scene, specs.specs);
 	AUD_freeHandle(AUD_playDevice(mixdown, scene->sound_scene, start / FPS));
 
 	return mixdown;
@@ -405,6 +406,9 @@ static void sound_start_play_scene(struct Scene *scene)
 {
 	if(scene->sound_scene_handle)
 		AUD_stop(scene->sound_scene_handle);
+
+	AUD_setSequencerDeviceSpecs(scene->sound_scene);
+
 	if((scene->sound_scene_handle = AUD_play(scene->sound_scene, 1)))
 		AUD_setLoop(scene->sound_scene_handle, -1);
 }
diff --git a/source/blender/blenkernel/intern/writeffmpeg.c b/source/blender/blenkernel/intern/writeffmpeg.c
index c729565533f..26de31b2b03 100644
--- a/source/blender/blenkernel/intern/writeffmpeg.c
+++ b/source/blender/blenkernel/intern/writeffmpeg.c
@@ -549,7 +549,7 @@ static AVStream* alloc_audio_stream(RenderData *rd, int codec_id, AVFormatContex
 	c->sample_rate = rd->ffcodecdata.audio_mixrate;
 	c->bit_rate = ffmpeg_audio_bitrate*1000;
 	c->sample_fmt = SAMPLE_FMT_S16;
-	c->channels = 2;
+	c->channels = rd->ffcodecdata.audio_channels;
 	codec = avcodec_find_encoder(c->codec_id);
 	if (!codec) {
 		//XXX error("Couldn't find a valid audio codec");
@@ -574,12 +574,11 @@ static AVStream* alloc_audio_stream(RenderData *rd, int codec_id, AVFormatContex
 			audio_outbuf_size = c->frame_size * c->channels * sizeof(int16_t) * 4;
 	}
 
-	audio_output_buffer = (uint8_t*)MEM_mallocN(
-		audio_outbuf_size, "FFMPEG audio encoder input buffer");
+	audio_output_buffer = (uint8_t*)av_malloc(
+		audio_outbuf_size);
 
-	audio_input_buffer = (uint8_t*)MEM_mallocN(
-		audio_input_samples * c->channels * sizeof(int16_t),
-		"FFMPEG audio encoder output buffer");
+	audio_input_buffer = (uint8_t*)av_malloc(
+		audio_input_samples * c->channels * sizeof(int16_t));
 
 	audio_time = 0.0f;
 
@@ -701,7 +700,7 @@ static int start_ffmpeg_impl(struct RenderData *rd, int rectx, int recty, Report
 	
 	if (ffmpeg_type == FFMPEG_DV) {
 		fmt->audio_codec = CODEC_ID_PCM_S16LE;
-		if (ffmpeg_audio_codec != CODEC_ID_NONE && rd->ffcodecdata.audio_mixrate != 48000) {
+		if (ffmpeg_audio_codec != CODEC_ID_NONE && rd->ffcodecdata.audio_mixrate != 48000 && rd->ffcodecdata.audio_channels != 2) {
 			BKE_report(reports, RPT_ERROR, "FFMPEG only supports 48khz / stereo audio for DV!");
 			return 0;
 		}
@@ -971,11 +970,11 @@ void end_ffmpeg(void)
 		video_buffer = 0;
 	}
 	if (audio_output_buffer) {
-		MEM_freeN(audio_output_buffer);
+		av_free(audio_output_buffer);
 		audio_output_buffer = 0;
 	}
 	if (audio_input_buffer) {
-		MEM_freeN(audio_input_buffer);
+		av_free(audio_input_buffer);
 		audio_input_buffer = 0;
 	}
 
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index b8a72616593..50be7b83484 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -11474,6 +11474,12 @@ static void do_versions(FileData *fd, Library *lib, Main *main)
 					kb->slidermax = kb->slidermin + 1.0f;
 			}
 		}
+
+		{
+			Scene *scene;
+			for (scene=main->scene.first; scene; scene=scene->id.next)
+				scene->r.ffcodecdata.audio_channels = 2;
+		}
 	}
 	
 	if (main->versionfile < 256 || (main->versionfile == 256 && main->subversionfile < 1)) {
diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 100a66d209f..2fc92aa12c4 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -126,6 +126,8 @@ typedef struct FFMpegCodecData {
 	int video_bitrate;
 	int audio_bitrate;
 	int audio_mixrate;
+	int audio_channels;
+	int audio_pad;
 	float audio_volume;
 	int gop_size;
 	int flags;
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 1322a18421b..a8d8d875ec4 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -98,6 +98,14 @@ EnumPropertyItem snap_element_items[] = {
 	{SCE_SNAP_MODE_VOLUME, "VOLUME", ICON_SNAP_VOLUME, "Volume", "Snap to volume"},
 	{0, NULL, 0, NULL, NULL}};
 
+static EnumPropertyItem audio_channel_items[] = {
+	{1, "MONO", 0, "Mono", "Set audio channels to mono"},
+	{2, "STEREO", 0, "Stereo", "Set audio channels to stereo"},
+	{4, "SURROUND4", 0, "4 Channels", "Set audio channels to 4 channels"},
+	{6, "SURROUND51", 0, "5.1 Surround", "Set audio channels to 5.1 surround sound"},
+	{8, "SURROUND71", 0, "7.1 Surround", "Set audio channels to 7.1 surround sound"},
+	{0, NULL, 0, NULL, NULL}};
+
 EnumPropertyItem image_type_items[] = {
 	{0, "", 0, "Image", NULL},
 	{R_BMP, "BMP", ICON_FILE_IMAGE, "BMP", "Output image in bitmap format"},
@@ -2468,6 +2476,10 @@ static void rna_def_scene_render_data(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Volume", "Audio volume");
 	RNA_def_property_update(prop, NC_SCENE|ND_RENDER_OPTIONS, NULL);
 
+	prop= RNA_def_property(srna, "ffmpeg_audio_channels", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "ffcodecdata.audio_channels");
+	RNA_def_property_enum_items(prop, audio_channel_items);
+	RNA_def_property_ui_text(prop, "Audio Channels", "Sets the audio channel count");
 #endif
 
 	prop= RNA_def_property(srna, "fps", PROP_INT, PROP_NONE);