videoeditorengine/audioeditorengine/resampler/src/resampler_sinc_conv_three_to_one_int16.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/videoeditorengine/audioeditorengine/resampler/src/resampler_sinc_conv_three_to_one_int16.cpp Fri Jan 29 14:08:33 2010 +0200
@@ -0,0 +1,246 @@
+/*
+* Copyright (c) 2010 Ixonos Plc.
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - Initial contribution
+*
+* Contributors:
+* Ixonos Plc
+*
+* Description:
+*
+*/
+
+
+#include "resampler_sinc_conv_three_to_one_int16.h"
+#include "resampler_clip.h"
+#include "resampler_sinc_conv_three_to_one_tables_standard.h"
+#include "resampler_sinc_conv_filter_three_to_one_int16.h"
+
+
+#include <string.h>
+
+/*
+ * The amount of zero crossings in positive or negative
+ * side of the sinc function. Because of filter symmetry
+ * the amount of filter taps used in convolution is
+ * zero crossings * 2.
+ */
+static const int LC_MAX_COEFF_COUNT = RESAMPLER_THREE_TO_ONE_COEFF_COUNT_STANDARD;
+
+static const int LC_BUFFER_ACCESS_OUTPUT = LC_MAX_COEFF_COUNT - 1;
+
+
+RESAMPLER_SincConvThreeToOneInt16::RESAMPLER_SincConvThreeToOneInt16(int channelCount) :
+m_memBuffers(0),
+m_scratchBuffer(0),
+m_channelCount(channelCount),
+m_blockSize(0),
+m_channelEnabled(0),
+m_state(0),
+m_coeffCount(RESAMPLER_THREE_TO_ONE_COEFF_COUNT_STANDARD),
+m_filterMatrix(RESAMPLER_THREE_TO_ONE_FILTERS_STANDARD)
+{
+}
+
+
+RESAMPLER_SincConvThreeToOneInt16::~RESAMPLER_SincConvThreeToOneInt16()
+{
+ DeInit();
+}
+
+bool RESAMPLER_SincConvThreeToOneInt16::InitInputDriven()
+{
+ return Init();
+}
+
+bool RESAMPLER_SincConvThreeToOneInt16::InitOutputDriven()
+{
+ return Init();
+}
+
+bool
+RESAMPLER_SincConvThreeToOneInt16::Init()
+{
+ int i(0);
+
+ m_memBuffers = new int16 *[m_channelCount];
+ if (!m_memBuffers)
+ {
+ return false;
+ }
+
+ for (i = 0; i < m_channelCount; i++)
+ {
+ m_memBuffers[i] = 0;
+ }
+
+ m_channelEnabled = new bool[m_channelCount];
+ if (!m_channelEnabled)
+ {
+ DeInit();
+ return false;
+ }
+ for (i = 0; i < m_channelCount; i++)
+ {
+ m_channelEnabled[i] = true;
+ }
+
+ for (i = 0; i < m_channelCount; i++)
+ {
+ m_memBuffers[i] = new int16[LC_MAX_COEFF_COUNT * 2 - 1];
+ if (!m_memBuffers[i])
+ {
+ DeInit();
+ return false;
+ }
+ memset(m_memBuffers[i], 0, sizeof(int16) * (LC_MAX_COEFF_COUNT * 2 - 1));
+ }
+
+ return true;
+}
+
+void
+RESAMPLER_SincConvThreeToOneInt16::DeInit()
+{
+ if (m_channelCount)
+ {
+ for (int i = 0; i < m_channelCount; i++)
+ {
+ delete [] m_memBuffers[i];
+ }
+ delete [] m_memBuffers;
+ delete [] m_channelEnabled;
+ }
+}
+
+
+void
+RESAMPLER_SincConvThreeToOneInt16::EnableChannel(int channel)
+{
+ m_channelEnabled[channel] = true;
+}
+
+void
+RESAMPLER_SincConvThreeToOneInt16::DisableChannel(int channel)
+{
+ m_channelEnabled[channel] = false;
+}
+
+size_t
+RESAMPLER_SincConvThreeToOneInt16::ScratchMemoryNeedInputDriven(int maxInputBlockSize) const
+{
+ return sizeof(int16) * ((LC_MAX_COEFF_COUNT * 2 - 1) + maxInputBlockSize);
+}
+
+void
+RESAMPLER_SincConvThreeToOneInt16::SetScratchBufferInputDriven(char *buffer)
+{
+ m_scratchBuffer = (int16 *)buffer;
+}
+
+size_t
+RESAMPLER_SincConvThreeToOneInt16::ScratchMemoryNeedOutputDriven(int maxOutputBlockSize) const
+{
+ int blockSize = 3 * maxOutputBlockSize;
+
+ return ScratchMemoryNeedInputDriven(blockSize);
+}
+
+void
+RESAMPLER_SincConvThreeToOneInt16::SetScratchBufferOutputDriven(char *buffer)
+{
+ m_scratchBuffer = (int16 *)buffer;
+}
+
+
+int
+RESAMPLER_SincConvThreeToOneInt16::MaxOutputSampleCount(int inSamples) const
+{
+ return ( inSamples + 2 ) / 3;
+}
+
+int
+RESAMPLER_SincConvThreeToOneInt16::MaxInputSampleCount(int outSamples) const
+{
+ return 3 * outSamples;
+}
+
+
+int
+RESAMPLER_SincConvThreeToOneInt16::InSamplesNeeded(int outSamples)
+{
+ return 3 * outSamples;
+}
+
+
+int
+RESAMPLER_SincConvThreeToOneInt16::ProcessToOutput(int16 *outputBuffers[],
+ int16 *inputBuffers[],
+ int outSamples)
+{
+ int inSamples( 3 * outSamples );
+
+ return ProcessFromInput(outputBuffers, inputBuffers, inSamples);
+}
+
+int
+RESAMPLER_SincConvThreeToOneInt16::ProcessFromInput(int16 *outputBuffers[],
+ int16 *inputBuffers[],
+ int inSamples)
+{
+ static const int FILTER_LENGTH = LC_MAX_COEFF_COUNT * 2 - 1;
+ int i, j;
+ int state = m_state;
+ int outSamples = (inSamples + state) / 3;
+
+ for (i = 0; i < m_channelCount; i++)
+ {
+ if (!m_channelEnabled[i])
+ {
+ break;
+ }
+
+ int16 *tempBuf = m_scratchBuffer;
+ int16 *outBuf = outputBuffers[i];
+ state = m_state;
+
+ memcpy(m_scratchBuffer,
+ m_memBuffers[i],
+ FILTER_LENGTH * sizeof(int16));
+
+ // Read samples into memory
+ memcpy(tempBuf + FILTER_LENGTH,
+ inputBuffers[i],
+ inSamples * sizeof(int16));
+
+ tempBuf += LC_BUFFER_ACCESS_OUTPUT - state;
+
+ for (j = 0; j < outSamples; j++)
+ {
+ int32 newSample =
+ RESAMPLER_SincConvFilterThreeToOneInt16(tempBuf,
+ m_filterMatrix,
+ m_coeffCount);
+ tempBuf += 3;
+
+ // round and shift down
+ outBuf[j] = (int16)RESAMPLER_Clip16((newSample + 16384 ) >> 15);
+ }
+
+ // Copy the newest samples to the beginning of the buffer
+ memcpy(m_memBuffers[i],
+ m_scratchBuffer + inSamples,
+ FILTER_LENGTH * sizeof(int16));
+ }
+
+ m_state = (state + inSamples) % 3;
+
+ return outSamples;
+}
+