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+/***************************** MPEG-4 AAC Decoder **************************
+
+ (C) Copyright Fraunhofer IIS (2004)
+ 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.
+
+
+ $Id$
+ Author(s): Josef Hoepfl
+ Description: pulse data tool
+
+ 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.
+
+******************************************************************************/
+
+#include "pulsedata.h"
+
+
+#include "channelinfo.h"
+
+
+INT CPulseData_Read(
+ HANDLE_FDK_BITSTREAM bs,
+ CPulseData *const PulseData,
+ const SHORT *sfb_startlines,
+ const void *pIcsInfo,
+ const SHORT frame_length
+ )
+{
+ int i, k=0;
+ const UINT MaxSfBands = GetScaleFactorBandsTransmitted((CIcsInfo*)pIcsInfo);
+
+ /* reset pulse data flag */
+ PulseData->PulseDataPresent = 0;
+
+ if ((PulseData->PulseDataPresent = (UCHAR) FDKreadBit(bs)) != 0) {
+ if (!IsLongBlock((CIcsInfo*)pIcsInfo)) {
+ return AAC_DEC_DECODE_FRAME_ERROR;
+ }
+
+ PulseData->NumberPulse = (UCHAR) FDKreadBits(bs,2);
+ PulseData->PulseStartBand = (UCHAR) FDKreadBits(bs,6);
+
+ if (PulseData->PulseStartBand >= MaxSfBands) {
+ return AAC_DEC_DECODE_FRAME_ERROR;
+ }
+
+ k = sfb_startlines[PulseData->PulseStartBand];
+
+ for (i=0; i<=PulseData->NumberPulse; i++) {
+ PulseData->PulseOffset[i] = (UCHAR) FDKreadBits(bs,5);
+ PulseData->PulseAmp[i] = (UCHAR) FDKreadBits(bs,4);
+ k += PulseData->PulseOffset[i];
+ }
+
+ if (k >= frame_length) {
+ return AAC_DEC_DECODE_FRAME_ERROR;
+ }
+ }
+
+
+ return 0;
+}
+
+void CPulseData_Apply(CPulseData *PulseData, /*!< pointer to pulse data side info */
+ const short *pScaleFactorBandOffsets, /*!< pointer to scalefactor band offsets */
+ FIXP_DBL *coef) /*!< pointer to spectrum */
+{
+ int i,k;
+
+ if (PulseData->PulseDataPresent)
+ {
+ k = pScaleFactorBandOffsets[PulseData->PulseStartBand];
+
+ for (i=0; i<=PulseData->NumberPulse; i++)
+ {
+ k += PulseData->PulseOffset[i];
+ if (coef [k] > (FIXP_DBL)0) coef[k] += (FIXP_DBL)(int)PulseData->PulseAmp[i];
+ else coef[k] -= (FIXP_DBL)(int)PulseData->PulseAmp[i];
+ }
+ }
+}
+