author | Mikael Laine <mikael.laine@ixonos.com> |
Fri, 29 Jan 2010 14:08:33 +0200 | |
changeset 0 | 951a5db380a0 |
permissions | -rw-r--r-- |
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#ifndef __RESAMPLER_SINC_CONV_THREE_TO_ONE_INT16_H__ |
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#define __RESAMPLER_SINC_CONV_THREE_TO_ONE_INT16_H__ |
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/* |
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* Copyright (c) 2010 Ixonos Plc. |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - Initial contribution |
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* |
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* Contributors: |
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* Ixonos Plc |
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* |
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* Description: |
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* |
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*/ |
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#include "resampler_rate_conversion_input_driven_int16.h" |
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#include "resampler_rate_conversion_output_driven_int16.h" |
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/** @ingroup rate_conversion |
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Class for downsampling 16-bit audio in 3 to 1 ratio |
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*/ |
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class RESAMPLER_SincConvThreeToOneInt16 : public RESAMPLER_RateConversionInputDrivenInt16, |
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public RESAMPLER_RateConversionOutputDrivenInt16 |
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{ |
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friend class RESAMPLER_RateConversionOutputDrivenInt16; |
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friend class RESAMPLER_RateConversionInputDrivenInt16; |
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public: |
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/** @name Destruction */ |
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//@{ |
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/** Destructor |
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*/ |
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virtual ~RESAMPLER_SincConvThreeToOneInt16(); |
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//@} |
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/** @name Query methods */ |
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//@{ |
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static bool RateSupported(float inRate, float outRate) |
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{ return (inRate == 3*outRate ); } |
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//@} |
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/** @name Object lifetime methods */ |
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//@{ |
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/** Initializes the converter. |
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This method initializes the sampling rate converter for output-driven |
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operation. The initialization will be successful only if |
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inRate == 2*outRate. |
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@return true if successful false otherwise |
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*/ |
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virtual bool InitOutputDriven(); |
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/** Initializes the converter. |
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This method initializes the sampling rate converter for input-driven |
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operation. |
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@return true if successful false otherwise |
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*/ |
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virtual bool InitInputDriven(); |
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//@} |
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/** @name Input-driven operation */ |
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//@{ |
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/** Disable one of the channels. |
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This method can be used to tell the algorithm that the output from a |
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specific channel will not be used in subsequent operations, and the |
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implementation may choose to optimize and leave the disabled channel |
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unprocessed. However, the caller must always provide valid pointers for |
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the actual processing methods for the case where it's difficult to |
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actually disable memory access for the specific channel in an |
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implementation. |
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@note The channel index MUST be valid, i.e., it has to be smaller than |
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@c numChannels given at initialization time. |
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@param[in] channel The index of the channel to be enabled. |
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*/ |
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virtual void DisableChannelInputDriven(int channel) |
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{ DisableChannel(channel); } |
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/** Enable one of the channels. |
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This method is used to (re-)enable a rate conversion channel after it's |
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been disabled. (All channels start in the enabled mode.) This is used to |
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tell the algorithm that the channel must be properly processed, if the |
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algorithm wants to take advantage of the optimization possibilities |
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provided by the DisableInputDriven() method. |
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@note The channel index MUST be valid, i.e., it has to be smaller than |
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@c numChannels given at initialization time. |
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@param[in] channel The index of the channel to be enabled. |
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*/ |
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virtual void EnableChannelInputDriven(int channel) |
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{ EnableChannel(channel); } |
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/** Query the scratch memory need of the converter. |
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This method queries the amount of scratch memory the input driven converter |
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needs to be able to handle in a single call to the processing functions. |
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@param[in] maxInputBlockSize Maximum input blocksize |
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@return memory need in bytes |
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*/ |
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virtual size_t ScratchMemoryNeedInputDriven(int maxInputBlockSize) const; |
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/** Set scratch buffer for the converter |
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This method sets scratch buffer needed by the converter when then converter is |
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used in input driven mode. The caller of this function is responsible of |
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allocating enough memory. |
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@param[in] *buffer pointer to the allocated buffer |
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*/ |
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virtual void SetScratchBufferInputDriven(char *buffer); |
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/** Get the maximum number of input samples needed. |
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This method returns the maximum number of input samples needed |
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for a given output sample count. |
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@param[in] outSamples Number of output samples |
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@return Maximum number of input samples |
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*/ |
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virtual int MaxInputSampleCount(int outSamples) const; |
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/** Get the amount of samples needed for input. |
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This method returns the amount of samples needed for converter input |
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given the number of output samples. This method must be called before |
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each call to the processing methods. It is a serious error to have |
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\a outSamples greater than the value set with ScratchMemoryNeedOutputDriven(). |
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@param[in] outSamples Amount of samples the converter produces |
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@return number of input samples needed |
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*/ |
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virtual int InSamplesNeeded(int outSamples); |
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/** Run the sampling rate conversion for a block of samples |
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This method runs the actual sampling rate conversion. The pointer arrays |
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have to contain valid pointers for numChannels channel data buffers. The |
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output buffers must have space for MaxOutputSampleCount(inSamples) audio |
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samples. |
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@param[out] outputBuffers Pointer to output buffer array |
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@param[in] inputBuffers Pointer to input buffer array |
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@param[in] inSamples The number of input samples to process |
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@return Number of output samples |
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*/ |
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virtual int ProcessFromInput(int16 *outputBuffers[], |
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int16 *inputBuffers[], |
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int inSamples); |
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//@} |
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/** @name Output-driven operation */ |
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//@{ |
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/** Enable one of the channels. |
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This method is used to (re-)enable a rate conversion channel after it's |
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been disabled. (All channels start in the enabled mode.) This is used to |
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tell the algorithm that the channel must be properly processed, if the |
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algorithm wants to take advantage of the optimization possibilities |
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provided by the DisableInputDriven() method. |
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@note The channel index MUST be valid, i.e., it has to be smaller than |
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@c numChannels given at initialization time. |
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@param[in] channel The index of the channel to be enabled. |
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*/ |
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virtual void EnableChannelOutputDriven(int channel) |
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{ EnableChannel(channel); } |
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/** Disable one of the channels. |
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This method can be used to tell the algorithm that the output from a |
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specific channel will not be used in subsequent operations, and the |
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implementation may choose to optimize and leave the disabled channel |
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unprocessed. However, the caller must always provide valid pointers for |
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the actual processing methods for the case where it's difficult to |
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actually disable memory access for the specific channel in an |
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implementation. |
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@note The channel index MUST be valid, i.e., it has to be smaller than |
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@c numChannels given at initialization time. |
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@param[in] channel The index of the channel to be enabled. |
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*/ |
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virtual void DisableChannelOutputDriven(int channel) |
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{ DisableChannel(channel); } |
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/** Query the scratch memory need of the converter. |
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This method queries the amount of scratch memory the output driven converter |
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needs to be able to handle in a single call to the processing functions. |
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@param[in] maxOutputBlockSize Maximum output blocksize |
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@return memory need in bytes |
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*/ |
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virtual size_t ScratchMemoryNeedOutputDriven(int maxOutputBlockSize) const; |
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/** Set scratch buffer for the converter |
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This method sets scratch buffer needed by the converter when then converter is |
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used in output driven mode. The caller of this function is responsible of |
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allocating enough memory. |
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@param[in] *buffer pointer to the allocated buffer |
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*/ |
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virtual void SetScratchBufferOutputDriven(char *buffer); |
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/** Get the maximum number of output samples for a given input sample count |
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This method returns the maximum number of output samples the converter |
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can ever produce from a given number of input samples. The method assumes |
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that the converter be used either input-driven or output-driven; the |
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two modes should not be mixed. |
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@param[in] inSamples Number of input samples |
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@return Maximum number of output samples |
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*/ |
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virtual int MaxOutputSampleCount(int inSamples) const; |
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/** Run the sampling rate conversion for a block of samples |
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This method does the sampling rate conversion. The pointer arrays |
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have to contain valid pointers for numChannels channel data buffers. |
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The input buffers MUST contain the amount of samples returned by |
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a previous call to InSamplesNeeded. Output buffers must have space |
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for \a outSamples audio samples. |
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@param[out] outputBuffers Pointer to output buffer array |
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@param[in] inputBuffers Pointer to input buffer array |
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@param[in] outSamples The number of samples the converter produces |
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@return Number of output samples |
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*/ |
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virtual int ProcessToOutput(int16 *outputBuffers[], |
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int16 *inputBuffers[], |
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int outSamples); |
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//@} |
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private: |
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/** Constructor |
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*/ |
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RESAMPLER_SincConvThreeToOneInt16(int channelCount); |
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/** Disabled copy contructor |
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*/ |
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RESAMPLER_SincConvThreeToOneInt16(const RESAMPLER_SincConvThreeToOneInt16 &); |
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/** Initializes the converter. |
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This method initializes the sampling rate converter. The |
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initialization will be successful only if 2*inRate == outRate. |
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@return true if successful false otherwise |
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*/ |
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bool Init(); |
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/** Deallocate all the allocated memory |
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This methods deallocates all memory previously allocated by |
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InitOutputDriven(). Can be used both for recovering from a memory |
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allocation error and in destructor. |
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*/ |
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void DeInit(); |
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/** Enable one of the channels */ |
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void EnableChannel(int channel); |
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/** Disable one of the channels */ |
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void DisableChannel(int channel); |
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int16 **m_memBuffers; |
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int16 *m_scratchBuffer; |
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int m_channelCount; |
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int m_blockSize; |
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bool *m_channelEnabled; |
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int m_state; |
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int m_coeffCount; |
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const int16 *m_filterMatrix; |
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}; |
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#endif // __RESAMPLER_SINC_CONV_THREE_TO_ONE_INT16_H__ |