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authorThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
commit2228e360595641dd906bf1773307f43d304f5b2e (patch)
tree57f3d390ebb0782cc0de0fb984c8ea7e45b4f386 /libFDK/src/scale.cpp
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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+ All rights reserved.
+
+ 1. INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2. COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3. NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4. DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5. CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/*************************** Fraunhofer IIS FDK Tools **********************
+
+ Author(s):
+ Description: Scaling operations
+
+******************************************************************************/
+
+#include "common_fix.h"
+
+#include "genericStds.h"
+
+/**************************************************
+ * Inline definitions
+ **************************************************/
+
+#define SCALE_INLINE inline
+
+
+#if defined(__mips__) /* cppp replaced: elif */
+#include "mips/scale.cpp"
+
+#elif defined(__arm__)
+#include "arm/scale_arm.cpp"
+
+#endif
+
+#ifndef FUNCTION_scaleValues_SGL
+/*!
+ *
+ * \brief Multiply input vector by \f$ 2^{scalefactor} \f$
+ * \param len must be larger than 4
+ * \return void
+ *
+ */
+#define FUNCTION_scaleValues_SGL
+SCALE_INLINE
+void scaleValues(FIXP_SGL *vector, /*!< Vector */
+ INT len, /*!< Length */
+ INT scalefactor /*!< Scalefactor */
+ )
+{
+ INT i;
+
+ /* Return if scalefactor is Zero */
+ if (scalefactor==0) return;
+
+ if(scalefactor > 0){
+ scalefactor = fixmin_I(scalefactor,(INT)(DFRACT_BITS-1));
+ for (i = len&3; i--; )
+ {
+ *(vector++) <<= scalefactor;
+ }
+ for (i = len>>2; i--; )
+ {
+ *(vector++) <<= scalefactor;
+ *(vector++) <<= scalefactor;
+ *(vector++) <<= scalefactor;
+ *(vector++) <<= scalefactor;
+ }
+ } else {
+ INT negScalefactor = fixmin_I(-scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *(vector++) >>= negScalefactor;
+ }
+ for (i = len>>2; i--; )
+ {
+ *(vector++) >>= negScalefactor;
+ *(vector++) >>= negScalefactor;
+ *(vector++) >>= negScalefactor;
+ *(vector++) >>= negScalefactor;
+ }
+ }
+}
+#endif
+
+#ifndef FUNCTION_scaleValues_DBL
+/*!
+ *
+ * \brief Multiply input vector by \f$ 2^{scalefactor} \f$
+ * \param len must be larger than 4
+ * \return void
+ *
+ */
+#define FUNCTION_scaleValues_DBL
+SCALE_INLINE
+void scaleValues(FIXP_DBL *vector, /*!< Vector */
+ INT len, /*!< Length */
+ INT scalefactor /*!< Scalefactor */
+ )
+{
+ INT i;
+
+ /* Return if scalefactor is Zero */
+ if (scalefactor==0) return;
+
+ if(scalefactor > 0){
+ scalefactor = fixmin_I(scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *(vector++) <<= scalefactor;
+ }
+ for (i = len>>2; i--; )
+ {
+ *(vector++) <<= scalefactor;
+ *(vector++) <<= scalefactor;
+ *(vector++) <<= scalefactor;
+ *(vector++) <<= scalefactor;
+ }
+ } else {
+ INT negScalefactor = fixmin_I(-scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *(vector++) >>= negScalefactor;
+ }
+ for (i = len>>2; i--; )
+ {
+ *(vector++) >>= negScalefactor;
+ *(vector++) >>= negScalefactor;
+ *(vector++) >>= negScalefactor;
+ *(vector++) >>= negScalefactor;
+ }
+ }
+}
+#endif
+
+#ifndef FUNCTION_scaleValues_DBLDBL
+/*!
+ *
+ * \brief Multiply input vector src by \f$ 2^{scalefactor} \f$
+ * and place result into dst
+ * \param dst detination buffer
+ * \param src source buffer
+ * \param len must be larger than 4
+ * \param scalefactor amount of left shifts to be applied
+ * \return void
+ *
+ */
+#define FUNCTION_scaleValues_DBLDBL
+SCALE_INLINE
+void scaleValues(FIXP_DBL *dst, /*!< dst Vector */
+ const FIXP_DBL *src, /*!< src Vector */
+ INT len, /*!< Length */
+ INT scalefactor /*!< Scalefactor */
+ )
+{
+ INT i;
+
+ /* Return if scalefactor is Zero */
+ if (scalefactor==0) {
+ if (dst != src)
+ FDKmemmove(dst, src, len*sizeof(FIXP_DBL));
+ }
+ else {
+
+ if(scalefactor > 0){
+ scalefactor = fixmin_I(scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *(dst++) = *(src++) << scalefactor;
+ }
+ for (i = len>>2; i--; )
+ {
+ *(dst++) = *(src++) << scalefactor;
+ *(dst++) = *(src++) << scalefactor;
+ *(dst++) = *(src++) << scalefactor;
+ *(dst++) = *(src++) << scalefactor;
+ }
+ } else {
+ INT negScalefactor = fixmin_I(-scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *(dst++) = *(src++) >> negScalefactor;
+ }
+ for (i = len>>2; i--; )
+ {
+ *(dst++) = *(src++) >> negScalefactor;
+ *(dst++) = *(src++) >> negScalefactor;
+ *(dst++) = *(src++) >> negScalefactor;
+ *(dst++) = *(src++) >> negScalefactor;
+ }
+ }
+ }
+}
+#endif
+
+#ifndef FUNCTION_scaleValuesWithFactor_DBL
+/*!
+ *
+ * \brief Multiply input vector by \f$ 2^{scalefactor} \f$
+ * \param len must be larger than 4
+ * \return void
+ *
+ */
+#define FUNCTION_scaleValuesWithFactor_DBL
+SCALE_INLINE
+void scaleValuesWithFactor(
+ FIXP_DBL *vector,
+ FIXP_DBL factor,
+ INT len,
+ INT scalefactor
+ )
+{
+ INT i;
+
+ /* Compensate fMultDiv2 */
+ scalefactor++;
+
+ if(scalefactor > 0){
+ scalefactor = fixmin_I(scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *vector = fMultDiv2(*vector, factor) << scalefactor;
+ vector++;
+ }
+ for (i = len>>2; i--; )
+ {
+ *vector = fMultDiv2(*vector, factor) << scalefactor; vector++;
+ *vector = fMultDiv2(*vector, factor) << scalefactor; vector++;
+ *vector = fMultDiv2(*vector, factor) << scalefactor; vector++;
+ *vector = fMultDiv2(*vector, factor) << scalefactor; vector++;
+ }
+ } else {
+ INT negScalefactor = fixmin_I(-scalefactor,(INT)DFRACT_BITS-1);
+ for (i = len&3; i--; )
+ {
+ *vector = fMultDiv2(*vector, factor) >> negScalefactor;
+ vector++;
+ }
+ for (i = len>>2; i--; )
+ {
+ *vector = fMultDiv2(*vector, factor) >> negScalefactor; vector++;
+ *vector = fMultDiv2(*vector, factor) >> negScalefactor; vector++;
+ *vector = fMultDiv2(*vector, factor) >> negScalefactor; vector++;
+ *vector = fMultDiv2(*vector, factor) >> negScalefactor; vector++;
+ }
+ }
+}
+#endif /* FUNCTION_scaleValuesWithFactor_DBL */
+
+
+/*******************************************
+
+IMPORTANT NOTE for usage of getScalefactor()
+
+If the input array contains negative values too, then these functions may sometimes return
+the actual maximum value minus 1, due to the nature of the applied algorithm.
+So be careful with possible fractional -1 values that may lead to overflows when being fPow2()'ed.
+
+********************************************/
+
+
+
+#ifndef FUNCTION_getScalefactorShort
+/*!
+ *
+ * \brief Calculate max possible scale factor for input vector of shorts
+ *
+ * \return Maximum scale factor / possible left shift
+ *
+ */
+#define FUNCTION_getScalefactorShort
+SCALE_INLINE
+INT getScalefactorShort(const SHORT *vector, /*!< Pointer to input vector */
+ INT len /*!< Length of input vector */
+ )
+{
+ INT i;
+ SHORT temp, maxVal = 0;
+
+ for(i=len;i!=0;i--){
+ temp = (SHORT)(*vector++);
+ maxVal |= (temp^(temp>>(SHORT_BITS-1)));
+ }
+
+ return fixmax_I((INT)0,(INT)(fixnormz_D((INT)maxVal) - (INT)1 - (INT)(DFRACT_BITS - SHORT_BITS)));
+}
+#endif
+
+#ifndef FUNCTION_getScalefactorPCM
+/*!
+ *
+ * \brief Calculate max possible scale factor for input vector of shorts
+ *
+ * \return Maximum scale factor
+ *
+ */
+#define FUNCTION_getScalefactorPCM
+SCALE_INLINE
+INT getScalefactorPCM(const INT_PCM *vector, /*!< Pointer to input vector */
+ INT len, /*!< Length of input vector */
+ INT stride
+ )
+{
+ INT i;
+ INT_PCM temp, maxVal = 0;
+
+ for(i=len;i!=0;i--){
+ temp = (INT_PCM)(*vector); vector+=stride;
+ maxVal |= (temp^(temp>>((sizeof(INT_PCM)*8)-1)));
+ }
+ return fixmax_I((INT)0,(INT)(fixnormz_D((INT)maxVal) - (INT)1 - (INT)(DFRACT_BITS - SAMPLE_BITS)));
+}
+#endif
+
+#ifndef FUNCTION_getScalefactorShort
+/*!
+ *
+ * \brief Calculate max possible scale factor for input vector of shorts
+ * \param stride, item increment between vector members.
+ * \return Maximum scale factor
+ *
+ */
+#define FUNCTION_getScalefactorShort
+SCALE_INLINE
+INT getScalefactorShort(const SHORT *vector, /*!< Pointer to input vector */
+ INT len, /*!< Length of input vector */
+ INT stride
+ )
+{
+ INT i;
+ SHORT temp, maxVal = 0;
+
+ for(i=len;i!=0;i--){
+ temp = (SHORT)(*vector); vector+=stride;
+ maxVal |= (temp^(temp>>(SHORT_BITS-1)));
+ }
+
+ return fixmax_I((INT)0,(INT)(fixnormz_D((INT)maxVal) - (INT)1 - (INT)(DFRACT_BITS - SHORT_BITS)));
+}
+#endif
+
+#ifndef FUNCTION_getScalefactor_DBL
+/*!
+ *
+ * \brief Calculate max possible scale factor for input vector
+ *
+ * \return Maximum scale factor
+ *
+ * This function can constitute a significant amount of computational complexity - very much depending on the
+ * bitrate. Since it is a rather small function, effective assembler optimization might be possible.
+ *
+ */
+#define FUNCTION_getScalefactor_DBL
+SCALE_INLINE
+INT getScalefactor(const FIXP_DBL *vector, /*!< Pointer to input vector */
+ INT len) /*!< Length of input vector */
+{
+ INT i;
+ FIXP_DBL temp, maxVal = (FIXP_DBL)0;
+
+ for(i=len;i!=0;i--){
+ temp = (LONG)(*vector++);
+ maxVal |= (FIXP_DBL)((LONG)temp^(LONG)(temp>>(DFRACT_BITS-1)));
+ }
+
+ return fixmax_I((INT)0,(INT)(fixnormz_D(maxVal) - 1));
+}
+#endif
+
+#ifndef FUNCTION_getScalefactor_SGL
+#define FUNCTION_getScalefactor_SGL
+SCALE_INLINE
+INT getScalefactor(const FIXP_SGL *vector, /*!< Pointer to input vector */
+ INT len) /*!< Length of input vector */
+{
+ INT i;
+ SHORT temp, maxVal = (FIXP_SGL)0;
+
+ for(i=len;i!=0;i--){
+ temp = (SHORT)(*vector++);
+ maxVal |= (temp^(temp>>(FRACT_BITS-1)));
+ }
+
+ return fixmax_I((INT)0,(INT)(fixnormz_D(FX_SGL2FX_DBL((FIXP_SGL)maxVal)) - 1));
+}
+#endif
+