From 7e1d63dd9fd149e4934bf77095c8610fac786b04 Mon Sep 17 00:00:00 2001
From: Henri Herscher <henri@oreka.org>
Date: Thu, 20 Oct 2005 13:40:58 +0000
Subject: First checkin

git-svn-id: https://oreka.svn.sourceforge.net/svnroot/oreka/trunk@2 09dcff7a-b715-0410-9601-b79a96267cd0
---
 orkbasecxx/AudioCapture.cpp | 201 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 201 insertions(+)
 create mode 100644 orkbasecxx/AudioCapture.cpp

(limited to 'orkbasecxx/AudioCapture.cpp')

diff --git a/orkbasecxx/AudioCapture.cpp b/orkbasecxx/AudioCapture.cpp
new file mode 100644
index 0000000..3178f2e
--- /dev/null
+++ b/orkbasecxx/AudioCapture.cpp
@@ -0,0 +1,201 @@
+/*
+ * Oreka -- A media capture and retrieval platform
+ * 
+ * Copyright (C) 2005, orecx LLC
+ *
+ * http://www.orecx.com
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License.
+ * Please refer to http://www.gnu.org/copyleft/gpl.html
+ *
+ */
+
+#define _WINSOCKAPI_		// prevents the inclusion of winsock.h
+
+#include "Utils.h"
+#include "math.h"
+#include "AudioCapture.h"
+
+
+AudioChunk::AudioChunk()
+{
+	m_encoding = UnknownAudio;
+	m_timestamp = 0;
+	m_sequenceNumber = 0;
+	m_numBytes = 0;
+	m_pBuffer = NULL;
+	m_sampleRate = 8000;
+}
+
+AudioChunk::~AudioChunk()
+{
+	if(m_pBuffer)
+	{
+		free(m_pBuffer);
+	}
+}
+
+void AudioChunk::SetBuffer(void* pBuffer, size_t numBytes, AudioEncodingEnum encoding, unsigned int timestamp, unsigned int sequenceNumber)
+{
+	if(m_pBuffer)
+	{
+		free(m_pBuffer);
+		m_numBytes = 0;
+	}
+	if(numBytes && pBuffer)
+	{
+		m_pBuffer = malloc(numBytes);
+		if (!m_pBuffer)
+		{
+			CStdString numBytesString = IntToString(numBytes);
+			throw("AudioChunk::AudioChunk: could not malloc a buffer of size:" + numBytesString);
+		}
+		else
+		{
+			m_numBytes = numBytes;
+			memcpy(m_pBuffer, pBuffer, numBytes);
+			m_encoding = encoding;
+			m_timestamp = timestamp;
+			m_sequenceNumber = sequenceNumber;
+		}
+	}
+}
+
+int AudioChunk::GetNumSamples()
+{
+	switch(m_encoding)
+	{
+	case PcmAudio:
+		return m_numBytes/2;
+	case AlawAudio: case UlawAudio:
+		return m_numBytes;
+	default:
+		throw(CStdString("AudioChunk::GetNumSamples: unknown encoding"));
+	}
+}
+
+double AudioChunk::GetDurationSec()
+{
+	int i = 0;
+	return ((double)GetNumSamples())/((double)m_sampleRate);
+}
+
+
+double AudioChunk::ComputeRms()
+{
+	double rmsValue = 0;
+	if(m_encoding == PcmAudio)
+	{
+		for(int i=0; i<GetNumSamples(); i++)
+		{
+			rmsValue += ((short *)m_pBuffer)[i] * ((short *)m_pBuffer)[i];
+		}
+		rmsValue = sqrt(rmsValue/GetNumSamples());
+	}
+	return rmsValue;
+}
+
+double AudioChunk::ComputeRmsDb()
+{
+	double rmsDbValue = 10 * log10(1.0/32768.0);	// default value, the lowest possible
+	if(m_encoding == PcmAudio)
+	{
+		rmsDbValue = 10 * log10(ComputeRms()/32768.0);
+	}
+	return rmsDbValue;
+}
+
+
+
+//=================================
+
+CaptureEvent::CaptureEvent()
+{
+	m_timestamp = 0;
+	m_type = EtUnknown;
+}
+
+CStdString CaptureEvent::DirectionToString(int direction)
+{
+	switch(direction)
+	{
+	case DirIn:
+		return DIR_IN;
+	case DirOut:
+		return DIR_OUT;
+	}
+	return DIR_UNKN;
+}
+
+int CaptureEvent::DirectionToEnum(CStdString& dir)
+{
+	if(dir.CompareNoCase(DIR_IN) == 0)
+	{
+		return DirIn;
+	}
+	else if(dir.CompareNoCase(DIR_OUT) == 0)
+	{
+		return DirOut;
+	}
+	return DirUnkn;
+}
+
+CStdString CaptureEvent::EventTypeToString(int eventTypeEnum)
+{
+	switch(eventTypeEnum)
+	{
+	case	EtUnknown:
+		return ET_UNKNOWN;
+	case	EtStart:
+		return ET_START;
+	case	EtStop:
+		return ET_STOP;
+	case	EtDirection:
+		return ET_DIRECTION;
+	case	EtRemoteParty:
+		return ET_REMOTEPARTY;
+	case	EtLocalParty:
+		return ET_LOCALPARTY;
+	case	EtLocalEntryPoint:
+		return ET_LOCALENTRYPOINT;
+	case	EtKeyValue:
+		return ET_KEYVALUE;
+	}
+	return ET_INVALID;
+}
+
+int CaptureEvent::EventTypeToEnum(CStdString& eventTypeString)
+{
+	int eventTypeEnum = EtUnknown;
+	if(eventTypeString.CompareNoCase(ET_START) == 0)
+	{
+		eventTypeEnum = EtStart;
+	}
+	else if (eventTypeString.CompareNoCase(ET_STOP) == 0)
+	{
+		eventTypeEnum = EtStop;
+	}
+	else if (eventTypeString.CompareNoCase(ET_DIRECTION) == 0)
+	{
+		eventTypeEnum = EtDirection;
+	}
+	else if (eventTypeString.CompareNoCase(ET_REMOTEPARTY) == 0)
+	{
+		eventTypeEnum = EtRemoteParty;
+	}
+	else if (eventTypeString.CompareNoCase(ET_LOCALPARTY) == 0)
+	{
+		eventTypeEnum = EtLocalParty;
+	}
+	else if (eventTypeString.CompareNoCase(ET_LOCALENTRYPOINT) == 0)
+	{
+		eventTypeEnum = EtLocalEntryPoint;
+	}
+	else if (eventTypeString.CompareNoCase(ET_KEYVALUE) == 0)
+	{
+		eventTypeEnum = EtKeyValue;
+	}
+	return eventTypeEnum;
+}
+
-- 
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