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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/channelinfo.cpp
parenta37315fe10ee143d6d0b28c19d41a476a23e63ea (diff)
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Fraunhofer AAC codec.
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
Diffstat (limited to 'libAACdec/src/channelinfo.cpp')
-rw-r--r--libAACdec/src/channelinfo.cpp214
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diff --git a/libAACdec/src/channelinfo.cpp b/libAACdec/src/channelinfo.cpp
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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: individual channel stream info
+
+ 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 "channelinfo.h"
+#include "aac_rom.h"
+#include "aac_ram.h"
+#include "FDK_bitstream.h"
+
+
+AAC_DECODER_ERROR IcsReadMaxSfb (
+ HANDLE_FDK_BITSTREAM bs,
+ CIcsInfo *pIcsInfo,
+ const SamplingRateInfo *pSamplingRateInfo
+ )
+{
+ AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
+ int nbits;
+
+ if (IsLongBlock(pIcsInfo)) {
+ nbits = 6;
+ pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Long;
+ } else {
+ nbits = 4;
+ pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Short;
+ }
+ pIcsInfo->MaxSfBands = (UCHAR) FDKreadBits(bs, nbits);
+
+ if (pIcsInfo->MaxSfBands > pIcsInfo->TotalSfBands){
+ ErrorStatus = AAC_DEC_PARSE_ERROR;
+ }
+
+ return ErrorStatus;
+}
+
+
+
+AAC_DECODER_ERROR IcsRead(HANDLE_FDK_BITSTREAM bs,
+ CIcsInfo *pIcsInfo,
+ const SamplingRateInfo* pSamplingRateInfo,
+ const UINT flags)
+{
+ AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
+
+ pIcsInfo->Valid = 0;
+
+ if (flags & AC_ELD){
+ pIcsInfo->WindowSequence = OnlyLongSequence;
+ pIcsInfo->WindowShape = 0;
+ }
+ else {
+ if ( !(flags & (AC_USAC|AC_RSVD50)) ) {
+ FDKreadBits(bs,1);
+ }
+ pIcsInfo->WindowSequence = (UCHAR) FDKreadBits(bs,2);
+ pIcsInfo->WindowShape = (UCHAR) FDKreadBits(bs,1);
+ if (flags & AC_LD) {
+ if (pIcsInfo->WindowShape) {
+ pIcsInfo->WindowShape = 2; /* select low overlap instead of KBD */
+ }
+ }
+ }
+
+ /* Sanity check */
+ if ( (flags & (AC_ELD|AC_LD)) && pIcsInfo->WindowSequence != OnlyLongSequence) {
+ pIcsInfo->WindowSequence = OnlyLongSequence;
+ ErrorStatus = AAC_DEC_PARSE_ERROR;
+ goto bail;
+ }
+
+ ErrorStatus = IcsReadMaxSfb(bs, pIcsInfo, pSamplingRateInfo);
+ if (ErrorStatus != AAC_DEC_OK) {
+ goto bail;
+ }
+
+ if (IsLongBlock(pIcsInfo))
+ {
+ if ( !(flags & (AC_ELD|AC_SCALABLE|AC_BSAC|AC_USAC|AC_RSVD50)) ) /* If not ELD nor Scalable nor BSAC nor USAC syntax then ... */
+ {
+ if ((UCHAR)FDKreadBits(bs,1) != 0 ) /* UCHAR PredictorDataPresent */
+ {
+ ErrorStatus = AAC_DEC_UNSUPPORTED_PREDICTION;
+ goto bail;
+ }
+ }
+
+ pIcsInfo->WindowGroups = 1;
+ pIcsInfo->WindowGroupLength[0] = 1;
+ }
+ else
+ {
+ INT i;
+ UINT mask;
+
+ pIcsInfo->ScaleFactorGrouping = (UCHAR) FDKreadBits(bs,7);
+
+ pIcsInfo->WindowGroups = 0 ;
+
+ for (i=0; i < (8-1); i++)
+ {
+ mask = 1 << (6 - i);
+ pIcsInfo->WindowGroupLength[i] = 1;
+
+ if (pIcsInfo->ScaleFactorGrouping & mask)
+ {
+ pIcsInfo->WindowGroupLength[pIcsInfo->WindowGroups]++;
+ }
+ else
+ {
+ pIcsInfo->WindowGroups++;
+ }
+ }
+
+ /* loop runs to i < 7 only */
+ pIcsInfo->WindowGroupLength[8-1] = 1;
+ pIcsInfo->WindowGroups++;
+ }
+
+
+bail:
+ if (ErrorStatus == AAC_DEC_OK)
+ pIcsInfo->Valid = 1;
+
+ return ErrorStatus;
+}
+
+
+/*
+ interleave codebooks the following way
+
+ 9 (84w) | 1 (51w)
+ 10 (82w) | 2 (39w)
+ SCL (65w) | 4 (38w)
+ 3 (39w) | 5 (41w)
+ | 6 (40w)
+ | 7 (31w)
+ | 8 (31w)
+ (270w) (271w)
+*/
+
+
+/*
+ Table entries are sorted as following:
+ | num_swb_long_window | sfbands_long | num_swb_short_window | sfbands_short |
+*/
+AAC_DECODER_ERROR getSamplingRateInfo(
+ SamplingRateInfo *t,
+ UINT samplesPerFrame,
+ UINT samplingRateIndex,
+ UINT samplingRate
+ )
+{
+ int index = 0;
+
+
+ t->samplingRateIndex = samplingRateIndex;
+ t->samplingRate = samplingRate;
+
+ switch (samplesPerFrame) {
+ case 1024:
+ index = 0;
+ break;
+ case 960:
+ index = 1;
+ break;
+ case 512:
+ index = 3;
+ break;
+ case 480:
+ index = 4;
+ break;
+
+ default:
+ return AAC_DEC_UNSUPPORTED_FORMAT;
+ }
+
+ t->ScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].sfbOffsetLong;
+ t->ScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].sfbOffsetShort;
+ t->NumberOfScaleFactorBands_Long = sfbOffsetTables[index][samplingRateIndex].numberOfSfbLong;
+ t->NumberOfScaleFactorBands_Short = sfbOffsetTables[index][samplingRateIndex].numberOfSfbShort;
+
+ if (t->ScaleFactorBands_Long == NULL || t->NumberOfScaleFactorBands_Long == 0) {
+ return AAC_DEC_UNSUPPORTED_FORMAT;
+ }
+
+ FDK_ASSERT(t->ScaleFactorBands_Long[t->NumberOfScaleFactorBands_Long] == samplesPerFrame);
+ FDK_ASSERT(t->ScaleFactorBands_Short == NULL || t->ScaleFactorBands_Short[t->NumberOfScaleFactorBands_Short]*8 == samplesPerFrame);
+
+ return AAC_DEC_OK;
+}