summaryrefslogtreecommitdiffstats
path: root/libSBRenc/src/sbr_misc.cpp
diff options
context:
space:
mode:
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 /libSBRenc/src/sbr_misc.cpp
downloadODR-AudioEnc-2228e360595641dd906bf1773307f43d304f5b2e.tar.gz
ODR-AudioEnc-2228e360595641dd906bf1773307f43d304f5b2e.tar.bz2
ODR-AudioEnc-2228e360595641dd906bf1773307f43d304f5b2e.zip
Snapshot 2bda038c163298531d47394bc2c09e1409c5d0db
Change-Id: If584e579464f28b97d50e51fc76ba654a5536c54
Diffstat (limited to 'libSBRenc/src/sbr_misc.cpp')
-rw-r--r--libSBRenc/src/sbr_misc.cpp272
1 files changed, 272 insertions, 0 deletions
diff --git a/libSBRenc/src/sbr_misc.cpp b/libSBRenc/src/sbr_misc.cpp
new file mode 100644
index 0000000..c44be22
--- /dev/null
+++ b/libSBRenc/src/sbr_misc.cpp
@@ -0,0 +1,272 @@
+
+/* -----------------------------------------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------------------------------------- */
+
+/*!
+ \file
+ \brief Sbr miscellaneous helper functions
+*/
+#include "sbr_misc.h"
+
+
+void FDKsbrEnc_Shellsort_fract (FIXP_DBL *in, INT n)
+{
+ FIXP_DBL v;
+ INT i, j;
+ INT inc = 1;
+
+ do
+ inc = 3 * inc + 1;
+ while (inc <= n);
+
+ do {
+ inc = inc / 3;
+ for (i = inc + 1; i <= n; i++) {
+ v = in[i-1];
+ j = i;
+ while (in[j-inc-1] > v) {
+ in[j-1] = in[j-inc-1];
+ j -= inc;
+ if (j <= inc)
+ break;
+ }
+ in[j-1] = v;
+ }
+ } while (inc > 1);
+
+}
+
+/* Sorting routine */
+void FDKsbrEnc_Shellsort_int (INT *in, INT n)
+{
+
+ INT i, j, v;
+ INT inc = 1;
+
+ do
+ inc = 3 * inc + 1;
+ while (inc <= n);
+
+ do {
+ inc = inc / 3;
+ for (i = inc + 1; i <= n; i++) {
+ v = in[i-1];
+ j = i;
+ while (in[j-inc-1] > v) {
+ in[j-1] = in[j-inc-1];
+ j -= inc;
+ if (j <= inc)
+ break;
+ }
+ in[j-1] = v;
+ }
+ } while (inc > 1);
+
+}
+
+
+
+/*******************************************************************************
+ Functionname: FDKsbrEnc_AddVecLeft
+ *******************************************************************************
+
+ Description:
+
+ Arguments: INT* dst, INT* length_dst, INT* src, INT length_src
+
+ Return: none
+
+*******************************************************************************/
+void
+FDKsbrEnc_AddVecLeft (INT *dst, INT *length_dst, INT *src, INT length_src)
+{
+ INT i;
+
+ for (i = length_src - 1; i >= 0; i--)
+ FDKsbrEnc_AddLeft (dst, length_dst, src[i]);
+}
+
+
+/*******************************************************************************
+ Functionname: FDKsbrEnc_AddLeft
+ *******************************************************************************
+
+ Description:
+
+ Arguments: INT* vector, INT* length_vector, INT value
+
+ Return: none
+
+*******************************************************************************/
+void
+FDKsbrEnc_AddLeft (INT *vector, INT *length_vector, INT value)
+{
+ INT i;
+
+ for (i = *length_vector; i > 0; i--)
+ vector[i] = vector[i - 1];
+ vector[0] = value;
+ (*length_vector)++;
+}
+
+
+/*******************************************************************************
+ Functionname: FDKsbrEnc_AddRight
+ *******************************************************************************
+
+ Description:
+
+ Arguments: INT* vector, INT* length_vector, INT value
+
+ Return: none
+
+*******************************************************************************/
+void
+FDKsbrEnc_AddRight (INT *vector, INT *length_vector, INT value)
+{
+ vector[*length_vector] = value;
+ (*length_vector)++;
+}
+
+
+
+/*******************************************************************************
+ Functionname: FDKsbrEnc_AddVecRight
+ *******************************************************************************
+
+ Description:
+
+ Arguments: INT* dst, INT* length_dst, INT* src, INT length_src)
+
+ Return: none
+
+*******************************************************************************/
+void
+FDKsbrEnc_AddVecRight (INT *dst, INT *length_dst, INT *src, INT length_src)
+{
+ INT i;
+ for (i = 0; i < length_src; i++)
+ FDKsbrEnc_AddRight (dst, length_dst, src[i]);
+}
+
+
+/*****************************************************************************
+
+ functionname: FDKsbrEnc_LSI_divide_scale_fract
+
+ description: Calculates division with best precision and scales the result.
+
+ return: num*scale/denom
+
+*****************************************************************************/
+FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom, FIXP_DBL scale)
+{
+ FIXP_DBL tmp = FL2FXCONST_DBL(0.0f);
+ if (num != FL2FXCONST_DBL(0.0f)) {
+
+ INT shiftCommon;
+ INT shiftNum = CountLeadingBits(num);
+ INT shiftDenom = CountLeadingBits(denom);
+ INT shiftScale = CountLeadingBits(scale);
+
+ num = num << shiftNum;
+ scale = scale << shiftScale;
+
+ tmp = fMultDiv2(num,scale);
+
+ if ( denom > (tmp >> fixMin(shiftNum+shiftScale-1,(DFRACT_BITS-1))) ) {
+ denom = denom << shiftDenom;
+ tmp = schur_div(tmp,denom,15);
+ shiftCommon = fixMin((shiftNum-shiftDenom+shiftScale-1),(DFRACT_BITS-1));
+ if (shiftCommon < 0)
+ tmp <<= -shiftCommon;
+ else
+ tmp >>= shiftCommon;
+ }
+ else {
+ tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL;
+ }
+ }
+
+ return (tmp);
+}
+