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authorDave Burke <daveburke@google.com>2012-04-17 09:51:45 -0700
committerDave Burke <daveburke@google.com>2012-04-17 23:04:43 -0700
commit9bf37cc9712506b2483650c82d3c41152337ef7e (patch)
tree77db44e2bae06e3d144b255628be2b7a55c581d3 /libAACenc/src/aacenc_tns.h
parenta37315fe10ee143d6d0b28c19d41a476a23e63ea (diff)
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Fraunhofer AAC codec.
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
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diff --git a/libAACenc/src/aacenc_tns.h b/libAACenc/src/aacenc_tns.h
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+/******************************** MPEG Audio Encoder **************************
+
+ (C) Copyright Fraunhofer IIS (1999)
+ All Rights Reserved
+
+ Please be advised that this software and/or program delivery is
+ Confidential Information of Fraunhofer and subject to and covered by the
+
+ Fraunhofer IIS Software Evaluation Agreement
+ between Google Inc. and Fraunhofer
+ effective and in full force since March 1, 2012.
+
+ You may use this software and/or program only under the terms and
+ conditions described in the above mentioned Fraunhofer IIS Software
+ Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+ This software and/or program is protected by copyright law and international
+ treaties. Any reproduction or distribution of this software and/or program,
+ or any portion of it, may result in severe civil and criminal penalties, and
+ will be prosecuted to the maximum extent possible under law.
+
+ $Id$
+ Initial author: Alex Groeschel
+ contents/description: Temporal noise shaping
+
+******************************************************************************/
+#ifndef _TNS_H
+#define _TNS_H
+
+#include "common_fix.h"
+
+#include "psy_const.h"
+
+
+#ifndef PI
+#define PI 3.1415926535897931f
+#endif
+
+/**
+ * TNS_ENABLE_MASK
+ * This bitfield defines which TNS features are enabled
+ * The TNS mask is composed of 4 bits.
+ * tnsMask |= 0x1; activate TNS short blocks
+ * tnsMask |= 0x2; activate TNS for long blocks
+ * tnsMask |= 0x4; activate TNS PEAK tool for short blocks
+ * tnsMask |= 0x8; activate TNS PEAK tool for long blocks
+ */
+#define TNS_ENABLE_MASK 0xf
+
+/* TNS max filter order for Low Complexity MPEG4 profile */
+#define TNS_MAX_ORDER 12
+
+
+#define MAX_NUM_OF_FILTERS 2
+
+
+typedef struct{ /*stuff that is tabulated dependent on bitrate etc. */
+ INT filterEnabled[MAX_NUM_OF_FILTERS];
+ INT threshOn[MAX_NUM_OF_FILTERS]; /* min. prediction gain for using tns TABUL*/
+ INT tnsLimitOrder[MAX_NUM_OF_FILTERS]; /* Limit for TNS order TABUL*/
+ INT tnsFilterDirection[MAX_NUM_OF_FILTERS]; /* Filtering direction, 0=up, 1=down TABUL */
+ INT acfSplit[MAX_NUM_OF_FILTERS];
+ INT seperateFiltersAllowed;
+
+}TNS_CONFIG_TABULATED;
+
+
+
+typedef struct { /*assigned at InitTime*/
+ TNS_CONFIG_TABULATED confTab;
+ INT tnsActive;
+ INT maxOrder; /* max. order of tns filter */
+ INT coefRes;
+ FIXP_DBL acfWindow[MAX_NUM_OF_FILTERS][TNS_MAX_ORDER+3+1];
+ /* now some things that only probably can be done at Init time;
+ could be they have to be split up for each individual (short) window or
+ even filter. */
+ INT lpcStartBand[MAX_NUM_OF_FILTERS];
+ INT lpcStartLine[MAX_NUM_OF_FILTERS];
+ INT lpcStopBand;
+ INT lpcStopLine;
+
+}TNS_CONFIG;
+
+
+typedef struct {
+ INT tnsActive;
+ INT predictionGain;
+} TNS_SUBBLOCK_INFO;
+
+typedef struct{ /*changed at runTime*/
+ TNS_SUBBLOCK_INFO subBlockInfo[TRANS_FAC];
+ FIXP_DBL ratioMultTable[TRANS_FAC][MAX_SFB_SHORT];
+} TNS_DATA_SHORT;
+
+typedef struct{ /*changed at runTime*/
+ TNS_SUBBLOCK_INFO subBlockInfo;
+ FIXP_DBL ratioMultTable[MAX_SFB_LONG];
+} TNS_DATA_LONG;
+
+/* can be implemented as union */
+typedef shouldBeUnion{
+ TNS_DATA_LONG Long;
+ TNS_DATA_SHORT Short;
+}TNS_DATA_RAW;
+
+typedef struct{
+ INT numOfSubblocks;
+ TNS_DATA_RAW dataRaw;
+ INT tnsMaxScaleSpec;
+ INT filtersMerged;
+}TNS_DATA;
+
+typedef struct{
+ INT numOfFilters[TRANS_FAC];
+ INT coefRes[TRANS_FAC];
+ INT length[TRANS_FAC][MAX_NUM_OF_FILTERS];
+ INT order[TRANS_FAC][MAX_NUM_OF_FILTERS];
+ INT direction[TRANS_FAC][MAX_NUM_OF_FILTERS];
+ INT coefCompress[TRANS_FAC][MAX_NUM_OF_FILTERS];
+ /* for Long: length TNS_MAX_ORDER (12 for LC) is required -> 12 */
+ /* for Short: length TRANS_FAC*TNS_MAX_ORDER (only 5 for short LC) is required -> 8*5=40 */
+ /* Currently TRANS_FAC*TNS_MAX_ORDER = 8*12 = 96 (for LC) is used (per channel)! Memory could be saved here! */
+ INT coef[TRANS_FAC][MAX_NUM_OF_FILTERS][TNS_MAX_ORDER];
+}TNS_INFO;
+
+INT FDKaacEnc_FreqToBandWithRounding(
+ const INT freq,
+ const INT fs,
+ const INT numOfBands,
+ const INT *bandStartOffset
+ );
+
+#endif /* _TNS_H */