videoeditorengine/audioeditorengine/resampler/src/resampler_sinc_conv_one_to_two_int16.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/videoeditorengine/audioeditorengine/resampler/src/resampler_sinc_conv_one_to_two_int16.cpp Fri Jan 29 14:08:33 2010 +0200
@@ -0,0 +1,262 @@
+/*
+* 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_one_to_two_int16.h"
+#include "resampler_clip.h"
+#include "resampler_sinc_conv_one_to_two_tables_standard.h"
+
+#include <string.h>
+
+#include "resampler_sinc_conv_one_to_two_int16.inl"
+
+static const int LC_ZERO_CROSSINGS = RESAMPLER_ONE_TO_TWO_ZERO_CROSSINGS_STANDARD; /* Needs to be divisible by two */
+
+
+RESAMPLER_SincConvOneToTwoInt16::RESAMPLER_SincConvOneToTwoInt16(int channelCount) :
+m_memBuffers(0),
+m_scratchBuffer(0),
+m_filter(RESAMPLER_ONE_TO_TWO_FILTERS_STANDARD),
+m_channelCount(channelCount),
+m_blockSize(0),
+m_channelEnabled(0),
+m_state(0)
+{
+}
+
+
+RESAMPLER_SincConvOneToTwoInt16::~RESAMPLER_SincConvOneToTwoInt16()
+{
+ DeInit();
+}
+
+
+bool RESAMPLER_SincConvOneToTwoInt16::InitInputDriven()
+{
+ return Init();
+}
+
+
+bool RESAMPLER_SincConvOneToTwoInt16::InitOutputDriven()
+{
+ return Init();
+}
+
+
+bool RESAMPLER_SincConvOneToTwoInt16::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_channelCount = m_channelCount;
+
+ 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_ZERO_CROSSINGS * 2];
+ if (!m_memBuffers[i])
+ {
+ DeInit();
+ return false;
+ }
+ memset(m_memBuffers[i], 0, sizeof(int16) * (LC_ZERO_CROSSINGS * 2));
+ }
+
+ return true;
+}
+
+
+void RESAMPLER_SincConvOneToTwoInt16::DeInit()
+{
+ if (m_channelCount)
+ {
+ for (int i = 0; i < m_channelCount; i++)
+ {
+ delete [] m_memBuffers[i];
+ }
+ delete [] m_memBuffers;
+ delete [] m_channelEnabled;
+ }
+}
+
+
+void RESAMPLER_SincConvOneToTwoInt16::EnableChannel(int channel)
+{
+ m_channelEnabled[channel] = true;
+}
+
+
+void RESAMPLER_SincConvOneToTwoInt16::DisableChannel(int channel)
+{
+ m_channelEnabled[channel] = false;
+}
+
+
+size_t
+RESAMPLER_SincConvOneToTwoInt16::ScratchMemoryNeedInputDriven(int maxInputBlockSize) const
+{
+ return sizeof(int16) * (LC_ZERO_CROSSINGS * 2 + maxInputBlockSize);
+}
+
+
+void
+RESAMPLER_SincConvOneToTwoInt16::SetScratchBufferInputDriven(char *buffer)
+{
+ m_scratchBuffer = (int16 *)buffer;
+}
+
+
+int RESAMPLER_SincConvOneToTwoInt16::MaxOutputSampleCount(int inSamples) const
+{
+ return 2 * inSamples;
+}
+
+
+int RESAMPLER_SincConvOneToTwoInt16::ProcessFromInput(int16 *outputBuffers[],
+ int16 *inputBuffers[],
+ int inSamples)
+{
+ int outSamples(2 * inSamples + m_state);
+ return ProcessToOutput(outputBuffers, inputBuffers, outSamples);
+}
+
+
+size_t
+RESAMPLER_SincConvOneToTwoInt16::ScratchMemoryNeedOutputDriven(int maxOutputBlockSize) const
+{
+ return ScratchMemoryNeedInputDriven((maxOutputBlockSize + 1) >> 1);
+}
+
+
+void
+RESAMPLER_SincConvOneToTwoInt16::SetScratchBufferOutputDriven(char *buffer)
+{
+ m_scratchBuffer = (int16 *)buffer;
+}
+
+
+int RESAMPLER_SincConvOneToTwoInt16::MaxInputSampleCount(int outSamples) const
+{
+ return (outSamples + 1) >> 1;
+}
+
+
+int RESAMPLER_SincConvOneToTwoInt16::InSamplesNeeded(int outSamples)
+{
+ int inSamples( (outSamples >> 1) + (outSamples & 1) * (1 - m_state) );
+
+ return inSamples;
+}
+
+
+int RESAMPLER_SincConvOneToTwoInt16::ProcessToOutput(int16 *outputBuffers[],
+ int16 *inputBuffers[],
+ int outSamples)
+{
+ static const int FILTER_LENGTH = 2 * LC_ZERO_CROSSINGS;
+
+ int i, j, k;
+ int oldState = m_state;
+ int newState = (oldState + outSamples) & 1;
+
+ for (i = 0; i < m_channelCount; i++)
+ {
+ if (!m_channelEnabled[i])
+ {
+ break;
+ }
+
+ int16 *tempBuf = m_scratchBuffer;
+ const int16 *inBuf = inputBuffers[i];
+ int16 *outBuf = outputBuffers[i];
+
+ memcpy(m_scratchBuffer, m_memBuffers[i], FILTER_LENGTH * sizeof(int16));
+
+ // Read samples into the memory buffer and
+ // copy samples into every second index of output buffer.
+ for (j = 0, k = oldState; k < outSamples; j++, k+=2)
+ {
+ int16 inputSample(inBuf[j]);
+ tempBuf[j + FILTER_LENGTH - 1 + oldState] = inputSample;
+ outBuf[k] = tempBuf[j + LC_ZERO_CROSSINGS - 1 + oldState];
+ }
+ int inSamples = j;
+
+ // Do band-limited interpolation and set the result into
+ // every second index in the output buffer.
+#ifdef RESAMPLER_SINC_CONV_ONE_TO_TWO_DUAL_FILTERING
+ for (j = 0, k = 1 - oldState; k < outSamples; j+=2, k+=4)
+ {
+ int newSample1(0);
+ int newSample2(0);
+
+ RESAMPLER_SincConvOneToTwoFilterDualInt16(newSample1,
+ newSample2,
+ tempBuf + LC_ZERO_CROSSINGS + j,
+ m_filter,
+ LC_ZERO_CROSSINGS);
+ // Round, shift down, and clip to 16 bits
+ outBuf[k] = (int16)RESAMPLER_Clip16((newSample1 + 16384) >> 15);
+ if (k + 2 < outSamples)
+ {
+ outBuf[k+2] = (int16)RESAMPLER_Clip16((newSample2 + 16384) >> 15);
+ }
+ }
+#else
+ for (j = 0, k = 1 - oldState; k < outSamples; j++, k+=2)
+ {
+ int32 newSample =
+ RESAMPLER_SincConvOneToTwoFilterInt16(tempBuf + LC_ZERO_CROSSINGS + j,
+ m_filter,
+ LC_ZERO_CROSSINGS);
+ // Round, shift down, and clip to 16 bits
+ outBuf[k] = (int16)RESAMPLER_Clip16((newSample + 16384) >> 15);
+ }
+#endif
+
+ // Copy the newest samples to the beginning of the buffer
+ memcpy(m_memBuffers[i],
+ tempBuf + inSamples + oldState - newState,
+ (FILTER_LENGTH - 1 + newState) * sizeof(int16));
+ }
+
+ // Update state according to even or odd amount of output samples.
+ m_state = newState;
+
+ return outSamples;
+}