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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 /libAACdec/src/arm/block_arm.cpp
parenta37315fe10ee143d6d0b28c19d41a476a23e63ea (diff)
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Fraunhofer AAC codec.
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
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diff --git a/libAACdec/src/arm/block_arm.cpp b/libAACdec/src/arm/block_arm.cpp
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+/******************************** Fraunhofer IIS ***************************
+
+ (C) Copyright Fraunhofer IIS (2010)
+ 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): Arthur Tritthart
+ Description: (ARM optimised) Scaling of spectral data
+
+ 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.
+
+******************************************************************************/
+
+
+#define FUNCTION_CBlock_ScaleSpectralData_func1
+
+/* Note: This loop is only separated for ARM in order to save cycles
+ by loop unrolling. The ARM core provides by default a 5-cycle
+ loop overhead per sample, that goes down to 1-cycle per sample
+ with an optimal 4x-loop construct (do - 4x - while).
+*/
+
+FDK_INLINE static void CBlock_ScaleSpectralData_func1(
+ FIXP_DBL *pSpectrum,
+ int max_band,
+ const SHORT * RESTRICT BandOffsets,
+ int SpecScale_window,
+ const SHORT * RESTRICT pSfbScale,
+ int window)
+{
+ int band_offset = 0;
+ for (int band=0; band < max_band; band++)
+ {
+ int runs = band_offset;
+ band_offset = BandOffsets[band+1];
+ runs = band_offset - runs; /* is always a multiple of 4 */
+ int scale = SpecScale_window-pSfbScale[window*16+band];
+ if (scale)
+ {
+ do
+ {
+ FIXP_DBL tmp0, tmp1, tmp2, tmp3;
+ tmp0 = pSpectrum[0];
+ tmp1 = pSpectrum[1];
+ tmp2 = pSpectrum[2];
+ tmp3 = pSpectrum[3];
+ tmp0 >>= scale;
+ tmp1 >>= scale;
+ tmp2 >>= scale;
+ tmp3 >>= scale;
+ *pSpectrum++ = tmp0;
+ *pSpectrum++ = tmp1;
+ *pSpectrum++ = tmp2;
+ *pSpectrum++ = tmp3;
+ } while ((runs = runs-4) != 0);
+ }
+ else
+ {
+ pSpectrum+= runs;
+ }
+ }
+}