From 9bf37cc9712506b2483650c82d3c41152337ef7e Mon Sep 17 00:00:00 2001
From: Dave Burke <daveburke@google.com>
Date: Tue, 17 Apr 2012 09:51:45 -0700
Subject: Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
---
 libAACdec/src/pulsedata.cpp | 96 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 libAACdec/src/pulsedata.cpp

(limited to 'libAACdec/src/pulsedata.cpp')

diff --git a/libAACdec/src/pulsedata.cpp b/libAACdec/src/pulsedata.cpp
new file mode 100644
index 0000000..062437a
--- /dev/null
+++ b/libAACdec/src/pulsedata.cpp
@@ -0,0 +1,96 @@
+/*****************************  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];
+    }
+  }
+}
+
-- 
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