Audio:

* Fix for [#31099] Audio in Meta-Strips Plays Beyond Strip Cut
* Adding a split files option to the mixdown operator which then renders each channel into a separate file

4 files changed, 103 insertions, 0 deletions

diff --git a/intern/audaspace/intern/AUD_C-API.cpp b/intern/audaspace/intern/AUD_C-API.cpp
index 9100a277124..50b47650696 100644
--- a/intern/audaspace/intern/AUD_C-API.cpp
+++ b/intern/audaspace/intern/AUD_C-API.cpp
@@ -41,6 +41,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <cmath>
+#include <sstream>
 
 #include "AUD_NULLDevice.h"
 #include "AUD_I3DDevice.h"
@@ -1236,6 +1237,47 @@ const char* AUD_mixdown(AUD_Sound* sound, unsigned int start, unsigned int lengt
 	}
 }
 
+const char* AUD_mixdown_per_channel(AUD_Sound* sound, unsigned int start, unsigned int length, unsigned int buffersize, const char* filename, AUD_DeviceSpecs specs, AUD_Container format, AUD_Codec codec, unsigned int bitrate)
+{
+	try
+	{
+		AUD_SequencerFactory* f = dynamic_cast<AUD_SequencerFactory*>(sound->get());
+
+		f->setSpecs(specs.specs);
+
+		std::vector<AUD_Reference<AUD_IWriter> > writers;
+
+		int channels = specs.channels;
+		specs.channels = AUD_CHANNELS_MONO;
+
+		for(int i = 0; i < channels; i++)
+		{
+			std::stringstream stream;
+			std::string fn = filename;
+			size_t index = fn.find_last_of('.');
+			size_t index_slash = fn.find_last_of('/');
+			size_t index_backslash = fn.find_last_of('\\');
+			if((index == std::string::npos) ||
+					((index < index_slash) && (index_slash != std::string::npos)) ||
+					((index < index_backslash) && (index_backslash != std::string::npos)))
+				stream << filename << "_" << (i + 1);
+			else
+				stream << fn.substr(0, index) << "_" << (i + 1) << fn.substr(index);
+			writers.push_back(AUD_FileWriter::createWriter(stream.str(), specs, format, codec, bitrate));
+		}
+
+		AUD_Reference<AUD_IReader> reader = f->createQualityReader();
+		reader->seek(start);
+		AUD_FileWriter::writeReader(reader, writers, length, buffersize);
+
+		return NULL;
+	}
+	catch(AUD_Exception& e)
+	{
+		return e.str;
+	}
+}
+
 AUD_Device* AUD_openMixdownDevice(AUD_DeviceSpecs specs, AUD_Sound* sequencer, float volume, float start)
 {
 	try
diff --git a/intern/audaspace/intern/AUD_C-API.h b/intern/audaspace/intern/AUD_C-API.h
index 8388af2170d..a52a1fa8369 100644
--- a/intern/audaspace/intern/AUD_C-API.h
+++ b/intern/audaspace/intern/AUD_C-API.h
@@ -710,6 +710,21 @@ extern void* AUD_getSet(void* set);
 extern const char* AUD_mixdown(AUD_Sound* sound, unsigned int start, unsigned int length, unsigned int buffersize, const char* filename, AUD_DeviceSpecs specs, AUD_Container format, AUD_Codec codec, unsigned int bitrate);
 
 /**
+ * Mixes a sound down into multiple files.
+ * \param sound The sound scene to mix down.
+ * \param start The start frame.
+ * \param length The count of frames to write.
+ * \param buffersize How many samples should be written at once.
+ * \param filename The file to write to, the channel number and an underscore are added at the beginning.
+ * \param specs The file's audio specification.
+ * \param format The file's container format.
+ * \param codec The codec used for encoding the audio data.
+ * \param bitrate The bitrate for encoding.
+ * \return An error message or NULL in case of success.
+ */
+extern const char* AUD_mixdown_per_channel(AUD_Sound* sound, unsigned int start, unsigned int length, unsigned int buffersize, const char* filename, AUD_DeviceSpecs specs, AUD_Container format, AUD_Codec codec, unsigned int bitrate);
+
+/**
  * Opens a read device and prepares it for mixdown of the sound scene.
  * \param specs Output audio specifications.
  * \param sequencer The sound scene to mix down.
diff --git a/intern/audaspace/intern/AUD_FileWriter.cpp b/intern/audaspace/intern/AUD_FileWriter.cpp
index df76b667e3f..f74021acad1 100644
--- a/intern/audaspace/intern/AUD_FileWriter.cpp
+++ b/intern/audaspace/intern/AUD_FileWriter.cpp
@@ -93,3 +93,39 @@ void AUD_FileWriter::writeReader(AUD_Reference<AUD_IReader> reader, AUD_Referenc
 		writer->write(len, buf);
 	}
 }
+
+void AUD_FileWriter::writeReader(AUD_Reference<AUD_IReader> reader, std::vector<AUD_Reference<AUD_IWriter> >& writers, unsigned int length, unsigned int buffersize)
+{
+	AUD_Buffer buffer(buffersize * AUD_SAMPLE_SIZE(reader->getSpecs()));
+	AUD_Buffer buffer2(buffersize * sizeof(sample_t));
+	sample_t* buf = buffer.getBuffer();
+	sample_t* buf2 = buffer2.getBuffer();
+
+	int len;
+	bool eos = false;
+	int channels = reader->getSpecs().channels;
+
+	for(unsigned int pos = 0; ((pos < length) || (length <= 0)) && !eos; pos += len)
+	{
+		len = buffersize;
+		if((len > length - pos) && (length > 0))
+			len = length - pos;
+		reader->read(len, eos, buf);
+
+		for(int channel = 0; channel < channels; channel++)
+		{
+			for(int i = 0; i < len; i++)
+			{
+				// clamping!
+				if(buf[i * channels + channel] > 1)
+					buf2[i] = 1;
+				else if(buf[i * channels + channel] < -1)
+					buf2[i] = -1;
+				else
+					buf2[i] = buf[i * channels + channel];
+			}
+
+			writers[channel]->write(len, buf2);
+		}
+	}
+}
diff --git a/intern/audaspace/intern/AUD_FileWriter.h b/intern/audaspace/intern/AUD_FileWriter.h
index c9ee2b1ee12..385aba5ef45 100644
--- a/intern/audaspace/intern/AUD_FileWriter.h
+++ b/intern/audaspace/intern/AUD_FileWriter.h
@@ -31,6 +31,7 @@
 #define __AUD_FILEWRITER_H__
 
 #include <string>
+#include <vector>
 
 #include "AUD_Reference.h"
 
@@ -68,6 +69,15 @@ public:
 	 * \param buffersize How many samples should be transfered at once.
 	 */
 	static void writeReader(AUD_Reference<AUD_IReader> reader, AUD_Reference<AUD_IWriter> writer, unsigned int length, unsigned int buffersize);
+
+	/**
+	 * Writes a reader to several writers.
+	 * \param reader The reader to read from.
+	 * \param writers The writers to write to.
+	 * \param length How many samples should be transfered.
+	 * \param buffersize How many samples should be transfered at once.
+	 */
+	static void writeReader(AUD_Reference<AUD_IReader> reader, std::vector<AUD_Reference<AUD_IWriter> >& writers, unsigned int length, unsigned int buffersize);
 };
 
 #endif //__AUD_FILEWRITER_H__