aboutsummaryrefslogtreecommitdiffstats
path: root/libAACdec/src/channelinfo.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'libAACdec/src/channelinfo.cpp')
-rw-r--r--libAACdec/src/channelinfo.cpp276
1 files changed, 276 insertions, 0 deletions
diff --git a/libAACdec/src/channelinfo.cpp b/libAACdec/src/channelinfo.cpp
new file mode 100644
index 0000000..6e520c0
--- /dev/null
+++ b/libAACdec/src/channelinfo.cpp
@@ -0,0 +1,276 @@
+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+ All rights reserved.
+
+ 1. INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2. COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3. NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4. DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5. CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/***************************** MPEG-4 AAC Decoder **************************
+
+ Author(s): Josef Hoepfl
+ Description: individual channel stream info
+
+******************************************************************************/
+
+#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;
+}