mirror of https://github.com/mstorsjo/fdk-aac.git
1410 lines
68 KiB
C++
1410 lines
68 KiB
C++
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/* -----------------------------------------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
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the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
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This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
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audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
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independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
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of the MPEG specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
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individually for the purpose of encoding or decoding bit streams in products that are compliant with
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the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
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these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
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software may already be covered under those patent licenses when it is used for those licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
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are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
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applications information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification, are permitted without
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payment of copyright license fees provided that you satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
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your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation and/or other materials
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provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
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You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived from this library without
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prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
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software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
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and the date of any change. For modified versions of the FDK AAC Codec, the term
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"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
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"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
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ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
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respect to this software.
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You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
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"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
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of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
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including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
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or business interruption, however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of this software, even if
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advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------------------------------------- */
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/***************************** MPEG-4 AAC Decoder ***************************
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Author(s): Robert Weidner (DSP Solutions)
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Description: HCR Decoder: Prepare decoding of non-PCWs, segmentation- and
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bitfield-handling, HCR-Statemachine
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*******************************************************************************/
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#include "aacdec_hcrs.h"
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#include "aacdec_hcr.h"
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#include "aacdec_hcr_bit.h"
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#include "aac_rom.h"
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#include "aac_ram.h"
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static UINT InitSegmentBitfield(UINT *pNumSegment,
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SCHAR *pRemainingBitsInSegment,
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UINT *pSegmentBitfield,
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UCHAR *pNumWordForBitfield,
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USHORT *pNumBitValidInLastWord);
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static void InitNonPCWSideInformationForCurrentSet(H_HCR_INFO pHcr);
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static INT ModuloValue(INT input, INT bufferlength);
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static void ClearBitFromBitfield(STATEFUNC *ptrState,
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UINT offset,
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UINT *pBitfield);
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/*---------------------------------------------------------------------------------------------
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description: This function decodes all non-priority codewords (non-PCWs) by using a
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state-machine.
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-------------------------------------------------------------------------------------------- */
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void DecodeNonPCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO pHcr)
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{
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UINT numValidSegment;
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INT segmentOffset;
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INT codewordOffsetBase;
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INT codewordOffset;
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UINT trial;
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UINT *pNumSegment;
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SCHAR *pRemainingBitsInSegment;
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UINT *pSegmentBitfield;
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UCHAR *pNumWordForBitfield;
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USHORT *pNumBitValidInLastWord;
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UINT *pCodewordBitfield;
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INT bitfieldWord;
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INT bitInWord;
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UINT tempWord;
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UINT interMediateWord;
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INT tempBit;
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INT carry;
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UINT numCodeword;
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UCHAR numSet;
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UCHAR currentSet;
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UINT codewordInSet;
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UINT remainingCodewordsInSet;
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SCHAR *pSta;
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UINT ret;
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pNumSegment = &(pHcr->segmentInfo.numSegment);
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pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
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pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
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pNumWordForBitfield = &(pHcr->segmentInfo.numWordForBitfield);
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pNumBitValidInLastWord = &(pHcr->segmentInfo.pNumBitValidInLastWord);
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pSta = pHcr->nonPcwSideinfo.pSta;
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numValidSegment = InitSegmentBitfield(pNumSegment,
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pRemainingBitsInSegment,
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pSegmentBitfield,
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pNumWordForBitfield,
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pNumBitValidInLastWord);
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if ( numValidSegment != 0 ) {
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numCodeword = pHcr->sectionInfo.numCodeword;
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numSet = ((numCodeword - 1) / *pNumSegment) + 1;
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pHcr->segmentInfo.readDirection = FROM_RIGHT_TO_LEFT;
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/* Process sets subsequently */
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for ( currentSet = 1; currentSet < numSet ; currentSet++ ) {
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/* step 1 */
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numCodeword -= *pNumSegment; /* number of remaining non PCWs [for all sets] */
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if ( numCodeword < *pNumSegment ) {
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codewordInSet = numCodeword; /* for last set */
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}
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else {
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codewordInSet = *pNumSegment; /* for all sets except last set */
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}
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/* step 2 */
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/* prepare array 'CodewordBitfield'; as much ones are written from left in all words, as much decodedCodewordInSetCounter nonPCWs exist in this set */
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tempWord = 0xFFFFFFFF;
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pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
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for ( bitfieldWord = *pNumWordForBitfield; bitfieldWord !=0; bitfieldWord-- ) { /* loop over all used words */
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if ( codewordInSet > NUMBER_OF_BIT_IN_WORD ) { /* more codewords than number of bits => fill ones */
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/* fill a whole word with ones */
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*pCodewordBitfield++ = tempWord;
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codewordInSet -= NUMBER_OF_BIT_IN_WORD; /* subtract number of bits */
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}
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else {
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/* prepare last tempWord */
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for (remainingCodewordsInSet = codewordInSet; remainingCodewordsInSet < NUMBER_OF_BIT_IN_WORD ; remainingCodewordsInSet++ ) {
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tempWord = tempWord & ~(1 << (NUMBER_OF_BIT_IN_WORD-1-remainingCodewordsInSet)); /* set a zero at bit number (NUMBER_OF_BIT_IN_WORD-1-i) in tempWord */
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}
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*pCodewordBitfield++ = tempWord;
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tempWord = 0x00000000;
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}
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}
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pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
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/* step 3 */
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/* build non-PCW sideinfo for each non-PCW of the current set */
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InitNonPCWSideInformationForCurrentSet(pHcr);
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/* step 4 */
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/* decode all non-PCWs belonging to this set */
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/* loop over trials */
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codewordOffsetBase = 0;
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for ( trial = *pNumSegment; trial > 0; trial-- ) {
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/* loop over number of words in bitfields */
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segmentOffset = 0; /* start at zero in every segment */
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pHcr->segmentInfo.segmentOffset = segmentOffset; /* store in structure for states */
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codewordOffset = codewordOffsetBase;
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pHcr->nonPcwSideinfo.codewordOffset = codewordOffset; /* store in structure for states */
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for ( bitfieldWord=0; bitfieldWord < *pNumWordForBitfield; bitfieldWord++ ) {
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/* derive tempWord with bitwise and */
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tempWord = pSegmentBitfield[bitfieldWord] & pCodewordBitfield[bitfieldWord];
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/* if tempWord is not zero, decode something */
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if ( tempWord != 0 ) {
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/* loop over all bits in tempWord; start state machine if & is true */
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for ( bitInWord = NUMBER_OF_BIT_IN_WORD; bitInWord > 0; bitInWord-- ) {
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interMediateWord = ((UINT)1 << (bitInWord-1) );
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if ( ( tempWord & interMediateWord ) == interMediateWord ) {
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/* get state and start state machine */
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pHcr->nonPcwSideinfo.pState = aStateConstant2State[pSta[codewordOffset]];
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while(pHcr->nonPcwSideinfo.pState) {
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ret = ((STATEFUNC) pHcr->nonPcwSideinfo.pState)(bs, pHcr);
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#if STATE_MACHINE_ERROR_CHECK
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if ( ret != 0 ) {
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return;
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}
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#endif
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}
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}
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/* update both offsets */
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segmentOffset += 1; /* add NUMBER_OF_BIT_IN_WORD times one */
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pHcr->segmentInfo.segmentOffset = segmentOffset;
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codewordOffset += 1; /* add NUMBER_OF_BIT_IN_WORD times one */
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codewordOffset = ModuloValue(codewordOffset,*pNumSegment); /* index of the current codeword lies within modulo range */
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pHcr->nonPcwSideinfo.codewordOffset = codewordOffset;
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}
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}
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else {
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segmentOffset += NUMBER_OF_BIT_IN_WORD; /* add NUMBER_OF_BIT_IN_WORD at once */
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pHcr->segmentInfo.segmentOffset = segmentOffset;
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codewordOffset += NUMBER_OF_BIT_IN_WORD; /* add NUMBER_OF_BIT_IN_WORD at once */
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codewordOffset = ModuloValue(codewordOffset,*pNumSegment); /* index of the current codeword lies within modulo range */
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pHcr->nonPcwSideinfo.codewordOffset = codewordOffset;
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}
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} /* end of bitfield word loop */
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/* decrement codeword - pointer */
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codewordOffsetBase -= 1;
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codewordOffsetBase = ModuloValue(codewordOffsetBase,*pNumSegment); /* index of the current codeword base lies within modulo range */
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/* rotate numSegment bits in codewordBitfield */
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/* rotation of *numSegment bits in bitfield of codewords (circle-rotation) */
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/* get last valid bit */
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tempBit = pCodewordBitfield[*pNumWordForBitfield-1] & (1 << (NUMBER_OF_BIT_IN_WORD - *pNumBitValidInLastWord));
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tempBit = tempBit >> (NUMBER_OF_BIT_IN_WORD - *pNumBitValidInLastWord);
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/* write zero into place where tempBit was fetched from */
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pCodewordBitfield[*pNumWordForBitfield-1] = pCodewordBitfield[*pNumWordForBitfield-1] & ~(1 << (NUMBER_OF_BIT_IN_WORD - *pNumBitValidInLastWord));
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/* rotate last valid word */
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pCodewordBitfield[*pNumWordForBitfield-1] = pCodewordBitfield[*pNumWordForBitfield-1] >> 1;
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/* transfare carry bit 0 from current word into bitposition 31 from next word and rotate current word */
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for ( bitfieldWord = *pNumWordForBitfield-2; bitfieldWord > -1 ; bitfieldWord-- ) {
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/* get carry (=bit at position 0) from current word */
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carry = pCodewordBitfield[bitfieldWord] & 1;
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/* put the carry bit at position 31 into word right from current word */
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pCodewordBitfield[bitfieldWord+1] = pCodewordBitfield[bitfieldWord+1] | (carry << (NUMBER_OF_BIT_IN_WORD-1));
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/* shift current word */
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pCodewordBitfield[bitfieldWord] = pCodewordBitfield[bitfieldWord] >> 1;
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}
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/* put tempBit into free bit-position 31 from first word */
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pCodewordBitfield[0] = pCodewordBitfield[0] | (tempBit << (NUMBER_OF_BIT_IN_WORD-1));
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} /* end of trial loop */
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/* toggle read direction */
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pHcr->segmentInfo.readDirection = ToggleReadDirection(pHcr->segmentInfo.readDirection);
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}
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/* end of set loop */
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/* all non-PCWs of this spectrum are decoded */
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}
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/* all PCWs and all non PCWs are decoded. They are unbacksorted in output buffer. Here is the Interface with comparing QSCs to asm decoding */
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}
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/*---------------------------------------------------------------------------------------------
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description: This function prepares the bitfield used for the
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segments. The list is set up once to be used in all following sets. If a
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segment is decoded empty, the according bit from the Bitfield is removed.
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-----------------------------------------------------------------------------------------------
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return: numValidSegment = the number of valid segments
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-------------------------------------------------------------------------------------------- */
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static UINT InitSegmentBitfield(UINT *pNumSegment,
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SCHAR *pRemainingBitsInSegment,
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UINT *pSegmentBitfield,
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UCHAR *pNumWordForBitfield,
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USHORT *pNumBitValidInLastWord)
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{
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SHORT i;
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USHORT r;
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UCHAR bitfieldWord;
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UINT tempWord;
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USHORT numValidSegment;
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*pNumWordForBitfield = ((*pNumSegment-1) >> THIRTYTWO_LOG_DIV_TWO_LOG) + 1;
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/* loop over all words, which are completely used or only partial */
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/* bit in pSegmentBitfield is zero if segment is empty; bit in pSegmentBitfield is one if segment is not empty */
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numValidSegment = 0;
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*pNumBitValidInLastWord = *pNumSegment;
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/* loop over words */
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for ( bitfieldWord=0; bitfieldWord < *pNumWordForBitfield - 1; bitfieldWord++ ) {
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tempWord = 0xFFFFFFFF; /* set ones */
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r = bitfieldWord << THIRTYTWO_LOG_DIV_TWO_LOG;
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for ( i=0; i < NUMBER_OF_BIT_IN_WORD; i++) {
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if ( pRemainingBitsInSegment[r + i] == 0 ) {
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tempWord = tempWord & ~(1 << (NUMBER_OF_BIT_IN_WORD-1-i)); /* set a zero at bit number (NUMBER_OF_BIT_IN_WORD-1-i) in tempWord */
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}
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else {
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numValidSegment += 1; /* count segments which are not empty */
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}
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}
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pSegmentBitfield[bitfieldWord] = tempWord; /* store result */
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*pNumBitValidInLastWord -= NUMBER_OF_BIT_IN_WORD; /* calculate number of zeros on LSB side in the last word */
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}
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/* calculate last word: prepare special tempWord */
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tempWord = 0xFFFFFFFF;
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for ( i=0; i < ( NUMBER_OF_BIT_IN_WORD - *pNumBitValidInLastWord ); i++ ) {
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tempWord = tempWord & ~(1 << i); /* clear bit i in tempWord */
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}
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/* calculate last word */
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r = bitfieldWord << THIRTYTWO_LOG_DIV_TWO_LOG;
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for ( i=0; i<*pNumBitValidInLastWord; i++) {
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if ( pRemainingBitsInSegment[r + i] == 0 ) {
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tempWord = tempWord & ~(1 << (NUMBER_OF_BIT_IN_WORD-1-i)); /* set a zero at bit number (NUMBER_OF_BIT_IN_WORD-1-i) in tempWord */
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}
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else {
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numValidSegment += 1; /* count segments which are not empty */
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}
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}
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pSegmentBitfield[bitfieldWord] = tempWord; /* store result */
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return numValidSegment;
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}
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/*---------------------------------------------------------------------------------------------
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description: This function sets up sideinfo for the non-PCW decoder (for the current set).
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---------------------------------------------------------------------------------------------*/
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static void InitNonPCWSideInformationForCurrentSet(H_HCR_INFO pHcr)
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{
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USHORT i,k;
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UCHAR codebookDim;
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UINT startNode;
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UCHAR *pCodebook = pHcr->nonPcwSideinfo.pCodebook;
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UINT *iNode = pHcr->nonPcwSideinfo.iNode;
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UCHAR *pCntSign = pHcr->nonPcwSideinfo.pCntSign;
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USHORT *iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
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UINT *pEscapeSequenceInfo = pHcr->nonPcwSideinfo.pEscapeSequenceInfo;
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SCHAR *pSta = pHcr->nonPcwSideinfo.pSta;
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USHORT *pNumExtendedSortedCodewordInSection = pHcr->sectionInfo.pNumExtendedSortedCodewordInSection;
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int numExtendedSortedCodewordInSectionIdx = pHcr->sectionInfo.numExtendedSortedCodewordInSectionIdx;
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UCHAR *pExtendedSortedCodebook = pHcr->sectionInfo.pExtendedSortedCodebook;
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int extendedSortedCodebookIdx = pHcr->sectionInfo.extendedSortedCodebookIdx;
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USHORT *pNumExtendedSortedSectionsInSets = pHcr->sectionInfo.pNumExtendedSortedSectionsInSets;
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int numExtendedSortedSectionsInSetsIdx = pHcr->sectionInfo.numExtendedSortedSectionsInSetsIdx;
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FIXP_DBL *pQuantizedSpectralCoefficients = SPEC_LONG(pHcr->decInOut.pQuantizedSpectralCoefficientsBase);
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int quantizedSpectralCoefficientsIdx = pHcr->decInOut.quantizedSpectralCoefficientsIdx;
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const UCHAR *pCbDimension = pHcr->tableInfo.pCbDimension;
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int iterationCounter = 0;
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/* loop over number of extended sorted sections in the current set so all codewords sideinfo variables within this set can be prepared for decoding */
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for ( i=pNumExtendedSortedSectionsInSets[numExtendedSortedSectionsInSetsIdx]; i != 0; i-- ) {
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codebookDim = pCbDimension[pExtendedSortedCodebook[extendedSortedCodebookIdx]];
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startNode = *aHuffTable[pExtendedSortedCodebook[extendedSortedCodebookIdx]];
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for ( k = pNumExtendedSortedCodewordInSection[numExtendedSortedCodewordInSectionIdx]; k != 0; k-- ) {
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iterationCounter++;
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if (iterationCounter > (1024>>2)) {
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return;
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}
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*pSta++ = aCodebook2StartInt[pExtendedSortedCodebook[extendedSortedCodebookIdx]];
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*pCodebook++ = pExtendedSortedCodebook[extendedSortedCodebookIdx];
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*iNode++ = startNode;
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*pCntSign++ = 0;
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*iResultPointer++ = quantizedSpectralCoefficientsIdx;
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*pEscapeSequenceInfo++ = 0;
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quantizedSpectralCoefficientsIdx += codebookDim; /* update pointer by codebookDim --> point to next starting value for writing out */
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if (quantizedSpectralCoefficientsIdx >= 1024) {
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return;
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}
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}
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numExtendedSortedCodewordInSectionIdx++; /* inc ptr for next ext sort sec in current set */
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extendedSortedCodebookIdx++; /* inc ptr for next ext sort sec in current set */
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if (numExtendedSortedCodewordInSectionIdx >= (MAX_SFB_HCR+MAX_HCR_SETS) || extendedSortedCodebookIdx >= (MAX_SFB_HCR+MAX_HCR_SETS)) {
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return;
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}
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}
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numExtendedSortedSectionsInSetsIdx++; /* inc ptr for next set of non-PCWs */
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if (numExtendedSortedCodewordInSectionIdx >= (MAX_SFB_HCR+MAX_HCR_SETS)) {
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return;
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}
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|
/* Write back indexes */
|
|
pHcr->sectionInfo.numExtendedSortedCodewordInSectionIdx = numExtendedSortedCodewordInSectionIdx;
|
|
pHcr->sectionInfo.extendedSortedCodebookIdx = extendedSortedCodebookIdx;
|
|
pHcr->sectionInfo.numExtendedSortedSectionsInSetsIdx = numExtendedSortedSectionsInSetsIdx;
|
|
pHcr->sectionInfo.numExtendedSortedCodewordInSectionIdx = numExtendedSortedCodewordInSectionIdx;
|
|
pHcr->decInOut.quantizedSpectralCoefficientsIdx = quantizedSpectralCoefficientsIdx;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: This function returns the input value if the value is in the
|
|
range of bufferlength. If <input> is smaller, one bufferlength is added,
|
|
if <input> is bigger one bufferlength is subtracted.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: modulo result
|
|
-------------------------------------------------------------------------------------------- */
|
|
static INT ModuloValue(INT input, INT bufferlength)
|
|
{
|
|
if ( input > (bufferlength - 1) ) {
|
|
return (input - bufferlength);
|
|
}
|
|
if ( input < 0 ) {
|
|
return (input + bufferlength);
|
|
}
|
|
return input;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: This function clears a bit from current bitfield and
|
|
switches off the statemachine.
|
|
|
|
A bit is cleared in two cases:
|
|
a) a codeword is decoded, then a bit is cleared in codeword bitfield
|
|
b) a segment is decoded empty, then a bit is cleared in segment bitfield
|
|
-------------------------------------------------------------------------------------------- */
|
|
static void ClearBitFromBitfield(STATEFUNC *ptrState,
|
|
UINT offset,
|
|
UINT *pBitfield)
|
|
{
|
|
UINT numBitfieldWord;
|
|
UINT numBitfieldBit;
|
|
|
|
/* get both values needed for clearing the bit */
|
|
numBitfieldWord = offset >> THIRTYTWO_LOG_DIV_TWO_LOG; /* int = wordNr */
|
|
numBitfieldBit = offset - (numBitfieldWord << THIRTYTWO_LOG_DIV_TWO_LOG); /* fract = bitNr */
|
|
|
|
/* clear a bit in bitfield */
|
|
pBitfield[numBitfieldWord] = pBitfield[numBitfieldWord] & ~(1 << (NUMBER_OF_BIT_IN_WORD-1 - numBitfieldBit));
|
|
|
|
/* switch off state machine because codeword is decoded and/or because segment is empty */
|
|
*ptrState = NULL;
|
|
}
|
|
|
|
|
|
|
|
/* =========================================================================================
|
|
the states of the statemachine
|
|
========================================================================================= */
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: Decodes the body of a codeword. This State is used for codebooks 1,2,5 and 6.
|
|
No sign bits are decoded, because the table of the quantized spectral values
|
|
has got a valid sign at the quantized spectral lines.
|
|
-----------------------------------------------------------------------------------------------
|
|
output: Two or four quantizes spectral values written at position where pResultPointr
|
|
points to
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_ONLY(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
UINT *pSegmentBitfield;
|
|
UINT *pCodewordBitfield;
|
|
UINT segmentOffset;
|
|
FIXP_DBL *pResultBase;
|
|
UINT *iNode;
|
|
USHORT *iResultPointer;
|
|
UINT codewordOffset;
|
|
UINT branchNode;
|
|
UINT branchValue;
|
|
UINT iQSC;
|
|
UINT treeNode;
|
|
UCHAR carryBit;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
UCHAR readDirection;
|
|
UCHAR *pCodebook;
|
|
UCHAR dimCntr;
|
|
const UINT *pCurrentTree;
|
|
const UCHAR *pCbDimension;
|
|
const SCHAR *pQuantVal;
|
|
const SCHAR *pQuantValBase;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
|
|
pCodebook = pHcr->nonPcwSideinfo.pCodebook;
|
|
iNode = pHcr->nonPcwSideinfo.iNode;
|
|
pResultBase = pHcr->nonPcwSideinfo.pResultBase;
|
|
iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
|
|
pCbDimension = pHcr->tableInfo.pCbDimension;
|
|
|
|
treeNode = iNode[codewordOffset];
|
|
pCurrentTree = aHuffTable[pCodebook[codewordOffset]];
|
|
|
|
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
|
|
CarryBitToBranchValue(carryBit, /* make a step in decoding tree */
|
|
treeNode,
|
|
&branchValue,
|
|
&branchNode);
|
|
|
|
/* if end of branch reached write out lines and count bits needed for sign, otherwise store node in codeword sideinfo */
|
|
if ((branchNode & TEST_BIT_10) == TEST_BIT_10) { /* test bit 10 ; ==> body is complete */
|
|
pQuantValBase = aQuantTable[pCodebook[codewordOffset]]; /* get base address of quantized values belonging to current codebook */
|
|
pQuantVal = pQuantValBase + branchValue; /* set pointer to first valid line [of 2 or 4 quantized values] */
|
|
|
|
iQSC = iResultPointer[codewordOffset]; /* get position of first line for writing out result */
|
|
|
|
for ( dimCntr = pCbDimension[pCodebook[codewordOffset]]; dimCntr != 0; dimCntr-- ) {
|
|
pResultBase[iQSC++] = (FIXP_DBL)*pQuantVal++; /* write out 2 or 4 lines into spectrum; no Sign bits available in this state */
|
|
}
|
|
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* last reinitialzation of for loop counter (see above) is done here */
|
|
break; /* end of branch in tree reached i.e. a whole nonPCW-Body is decoded */
|
|
}
|
|
else { /* body is not decoded completely: */
|
|
treeNode = *(pCurrentTree + branchValue); /* update treeNode for further step in decoding tree */
|
|
}
|
|
}
|
|
iNode[codewordOffset] = treeNode; /* store updated treeNode because maybe decoding of codeword body not finished yet */
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_ONLY;
|
|
return BODY_ONLY;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: Decodes the codeword body, writes out result and counts the number of quantized
|
|
spectral values, which are different form zero. For those values sign bits are
|
|
needed.
|
|
|
|
If sign bit counter cntSign is different from zero, switch to next state to
|
|
decode sign Bits there.
|
|
If sign bit counter cntSign is zero, no sign bits are needed and codeword is
|
|
decoded.
|
|
-----------------------------------------------------------------------------------------------
|
|
output: Two or four written quantizes spectral values written at position where
|
|
pResultPointr points to. The signs of those lines may be wrong. If the signs
|
|
[on just one signle sign] is wrong, the next state will correct it.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_SIGN__BODY(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
UCHAR readDirection;
|
|
UINT *pSegmentBitfield;
|
|
UINT *pCodewordBitfield;
|
|
UINT segmentOffset;
|
|
|
|
UCHAR *pCodebook;
|
|
UINT *iNode;
|
|
UCHAR *pCntSign;
|
|
FIXP_DBL *pResultBase;
|
|
USHORT *iResultPointer;
|
|
UINT codewordOffset;
|
|
|
|
UINT iQSC;
|
|
UINT cntSign;
|
|
UCHAR dimCntr;
|
|
UCHAR carryBit;
|
|
SCHAR *pSta;
|
|
UINT treeNode;
|
|
UINT branchValue;
|
|
UINT branchNode;
|
|
const UCHAR *pCbDimension;
|
|
const UINT *pCurrentTree;
|
|
const SCHAR *pQuantValBase;
|
|
const SCHAR *pQuantVal;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
|
|
pCodebook = pHcr->nonPcwSideinfo.pCodebook;
|
|
iNode = pHcr->nonPcwSideinfo.iNode;
|
|
pCntSign = pHcr->nonPcwSideinfo.pCntSign;
|
|
pResultBase = pHcr->nonPcwSideinfo.pResultBase;
|
|
iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
pSta = pHcr->nonPcwSideinfo.pSta;
|
|
|
|
pCbDimension = pHcr->tableInfo.pCbDimension;
|
|
|
|
treeNode = iNode[codewordOffset];
|
|
pCurrentTree = aHuffTable[pCodebook[codewordOffset]];
|
|
|
|
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
|
|
CarryBitToBranchValue(carryBit, /* make a step in decoding tree */
|
|
treeNode,
|
|
&branchValue,
|
|
&branchNode);
|
|
|
|
/* if end of branch reached write out lines and count bits needed for sign, otherwise store node in codeword sideinfo */
|
|
if ((branchNode & TEST_BIT_10) == TEST_BIT_10) { /* test bit 10 ; if set body complete */
|
|
/* body completely decoded; branchValue is valid, set pQuantVal to first (of two or four) quantized spectral coefficients */
|
|
pQuantValBase = aQuantTable[pCodebook[codewordOffset]]; /* get base address of quantized values belonging to current codebook */
|
|
pQuantVal = pQuantValBase + branchValue; /* set pointer to first valid line [of 2 or 4 quantized values] */
|
|
|
|
iQSC = iResultPointer[codewordOffset]; /* get position of first line for writing result */
|
|
|
|
/* codeword decoding result is written out here: Write out 2 or 4 quantized spectral values with probably */
|
|
/* wrong sign and count number of values which are different from zero for sign bit decoding [which happens in next state] */
|
|
cntSign = 0;
|
|
for ( dimCntr = pCbDimension[pCodebook[codewordOffset]]; dimCntr != 0; dimCntr-- ) {
|
|
pResultBase[iQSC++] = (FIXP_DBL)*pQuantVal; /* write quant. spec. coef. into spectrum */
|
|
if ( *pQuantVal++ != 0 ) {
|
|
cntSign += 1;
|
|
}
|
|
}
|
|
|
|
if ( cntSign == 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
}
|
|
else {
|
|
pCntSign[codewordOffset] = cntSign; /* write sign count result into codewordsideinfo of current codeword */
|
|
pSta[codewordOffset] = BODY_SIGN__SIGN; /* change state */
|
|
pHcr->nonPcwSideinfo.pState = aStateConstant2State[pSta[codewordOffset]]; /* get state from separate array of cw-sideinfo */
|
|
}
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* last reinitialzation of for loop counter (see above) is done here */
|
|
break; /* end of branch in tree reached i.e. a whole nonPCW-Body is decoded */
|
|
}
|
|
else {/* body is not decoded completely: */
|
|
treeNode = *(pCurrentTree + branchValue); /* update treeNode for further step in decoding tree */
|
|
}
|
|
}
|
|
iNode[codewordOffset] = treeNode; /* store updated treeNode because maybe decoding of codeword body not finished yet */
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_SIGN__BODY;
|
|
return BODY_SIGN__BODY;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: This state decodes the sign bits belonging to a codeword. The state is called
|
|
as often in different "trials" until pCntSgn[codewordOffset] is zero.
|
|
-----------------------------------------------------------------------------------------------
|
|
output: The two or four quantizes spectral values (written in previous state) have
|
|
now the correct sign.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_SIGN__SIGN(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
UCHAR readDirection;
|
|
UINT *pSegmentBitfield;
|
|
UINT *pCodewordBitfield;
|
|
UINT segmentOffset;
|
|
|
|
UCHAR *pCntSign;
|
|
FIXP_DBL *pResultBase;
|
|
USHORT *iResultPointer;
|
|
UINT codewordOffset;
|
|
UCHAR carryBit;
|
|
UINT iQSC;
|
|
UCHAR cntSign;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
|
|
pCntSign = pHcr->nonPcwSideinfo.pCntSign;
|
|
pResultBase = pHcr->nonPcwSideinfo.pResultBase;
|
|
iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
iQSC = iResultPointer[codewordOffset];
|
|
cntSign = pCntSign[codewordOffset];
|
|
|
|
|
|
|
|
/* loop for sign bit decoding */
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
cntSign -= 1; /* decrement sign counter because one sign bit has been read */
|
|
|
|
/* search for a line (which was decoded in previous state) which is not zero. [This value will get a sign] */
|
|
while ( pResultBase[iQSC] == (FIXP_DBL)0 ) {
|
|
iQSC++; /* points to current value different from zero */
|
|
if (iQSC >= 1024) {
|
|
return BODY_SIGN__SIGN;
|
|
}
|
|
}
|
|
|
|
/* put sign together with line; if carryBit is zero, the sign is ok already; no write operation necessary in this case */
|
|
if ( carryBit != 0 ) {
|
|
pResultBase[iQSC] = -pResultBase[iQSC]; /* carryBit = 1 --> minus */
|
|
}
|
|
|
|
iQSC++; /* update pointer to next (maybe valid) value */
|
|
|
|
if ( cntSign == 0 ) { /* if (cntSign==0) ==> set state CODEWORD_DECODED */
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* last reinitialzation of for loop counter (see above) is done here */
|
|
break; /* whole nonPCW-Body and according sign bits are decoded */
|
|
}
|
|
}
|
|
pCntSign[codewordOffset] = cntSign;
|
|
iResultPointer[codewordOffset] = iQSC; /* store updated pResultPointer */
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_SIGN__SIGN;
|
|
return BODY_SIGN__SIGN;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: Decodes the codeword body in case of codebook is 11. Writes out resulting
|
|
two or four lines [with probably wrong sign] and counts the number of
|
|
lines, which are different form zero. This information is needed in next
|
|
state where sign bits will be decoded, if necessary.
|
|
If sign bit counter cntSign is zero, no sign bits are needed and codeword is
|
|
decoded completely.
|
|
-----------------------------------------------------------------------------------------------
|
|
output: Two lines (quantizes spectral coefficients) which are probably wrong. The
|
|
sign may be wrong and if one or two values is/are 16, the following states
|
|
will decode the escape sequence to correct the values which are wirtten here.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_SIGN_ESC__BODY(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
UCHAR readDirection;
|
|
UINT *pSegmentBitfield;
|
|
UINT *pCodewordBitfield;
|
|
UINT segmentOffset;
|
|
|
|
UINT *iNode;
|
|
UCHAR *pCntSign;
|
|
FIXP_DBL *pResultBase;
|
|
USHORT *iResultPointer;
|
|
UINT codewordOffset;
|
|
|
|
UCHAR carryBit;
|
|
UINT iQSC;
|
|
UINT cntSign;
|
|
UINT dimCntr;
|
|
UINT treeNode;
|
|
SCHAR *pSta;
|
|
UINT branchNode;
|
|
UINT branchValue;
|
|
const UINT *pCurrentTree;
|
|
const SCHAR *pQuantValBase;
|
|
const SCHAR *pQuantVal;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
|
|
iNode = pHcr->nonPcwSideinfo.iNode;
|
|
pCntSign = pHcr->nonPcwSideinfo.pCntSign;
|
|
pResultBase = pHcr->nonPcwSideinfo.pResultBase;
|
|
iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
pSta = pHcr->nonPcwSideinfo.pSta;
|
|
|
|
treeNode = iNode[codewordOffset];
|
|
pCurrentTree = aHuffTable[ESCAPE_CODEBOOK];
|
|
|
|
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
|
|
/* make a step in tree */
|
|
CarryBitToBranchValue(carryBit,
|
|
treeNode,
|
|
&branchValue,
|
|
&branchNode);
|
|
|
|
/* if end of branch reached write out lines and count bits needed for sign, otherwise store node in codeword sideinfo */
|
|
if ((branchNode & TEST_BIT_10) == TEST_BIT_10) { /* test bit 10 ; if set body complete */
|
|
|
|
/* body completely decoded; branchValue is valid */
|
|
/* set pQuantVol to first (of two or four) quantized spectral coefficients */
|
|
pQuantValBase = aQuantTable[ESCAPE_CODEBOOK]; /* get base address of quantized values belonging to current codebook */
|
|
pQuantVal = pQuantValBase + branchValue; /* set pointer to first valid line [of 2 or 4 quantized values] */
|
|
|
|
/* make backup from original resultPointer in node storage for state BODY_SIGN_ESC__SIGN */
|
|
iNode[codewordOffset] = iResultPointer[codewordOffset];
|
|
|
|
/* get position of first line for writing result */
|
|
iQSC = iResultPointer[codewordOffset];
|
|
|
|
/* codeword decoding result is written out here: Write out 2 or 4 quantized spectral values with probably */
|
|
/* wrong sign and count number of values which are different from zero for sign bit decoding [which happens in next state] */
|
|
cntSign = 0;
|
|
|
|
for ( dimCntr = DIMENSION_OF_ESCAPE_CODEBOOK; dimCntr != 0; dimCntr-- ) {
|
|
pResultBase[iQSC++] = (FIXP_DBL)*pQuantVal; /* write quant. spec. coef. into spectrum */
|
|
if ( *pQuantVal++ != 0 ) {
|
|
cntSign += 1;
|
|
}
|
|
}
|
|
|
|
if ( cntSign == 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
/* codeword decoded */
|
|
}
|
|
else {
|
|
/* write sign count result into codewordsideinfo of current codeword */
|
|
pCntSign[codewordOffset] = cntSign;
|
|
pSta[codewordOffset] = BODY_SIGN_ESC__SIGN; /* change state */
|
|
pHcr->nonPcwSideinfo.pState = aStateConstant2State[pSta[codewordOffset]]; /* get state from separate array of cw-sideinfo */
|
|
}
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* the last reinitialzation of for loop counter (see above) is done here */
|
|
break; /* end of branch in tree reached i.e. a whole nonPCW-Body is decoded */
|
|
}
|
|
else { /* body is not decoded completely: */
|
|
/* update treeNode for further step in decoding tree and store updated treeNode because maybe no more bits left in segment */
|
|
treeNode = *(pCurrentTree + branchValue);
|
|
iNode[codewordOffset] = treeNode;
|
|
}
|
|
}
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_SIGN_ESC__BODY;
|
|
return BODY_SIGN_ESC__BODY;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: This state decodes the sign bits, if a codeword of codebook 11 needs some.
|
|
A flag named 'flagB' in codeword sideinfo is set, if the second line of
|
|
quantized spectral values is 16. The 'flagB' is used in case of decoding
|
|
of a escape sequence is necessary as far as the second line is concerned.
|
|
|
|
If only the first line needs an escape sequence, the flagB is cleared.
|
|
If only the second line needs an escape sequence, the flagB is not used.
|
|
|
|
For storing sideinfo in case of escape sequence decoding one single word
|
|
can be used for both escape sequences because they are decoded not at the
|
|
same time:
|
|
|
|
|
|
bit 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
|
|
===== == == =========== =========== ===================================
|
|
^ ^ ^ ^ ^ ^
|
|
| | | | | |
|
|
res. flagA flagB escapePrefixUp escapePrefixDown escapeWord
|
|
|
|
-----------------------------------------------------------------------------------------------
|
|
output: Two lines with correct sign. If one or two values is/are 16, the lines are
|
|
not valid, otherwise they are.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_SIGN_ESC__SIGN(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
UCHAR readDirection;
|
|
UINT *pSegmentBitfield;
|
|
UINT *pCodewordBitfield;
|
|
UINT segmentOffset;
|
|
|
|
UINT *iNode;
|
|
UCHAR *pCntSign;
|
|
FIXP_DBL *pResultBase;
|
|
USHORT *iResultPointer;
|
|
UINT *pEscapeSequenceInfo;
|
|
UINT codewordOffset;
|
|
|
|
UINT iQSC;
|
|
UCHAR cntSign;
|
|
UINT flagA;
|
|
UINT flagB;
|
|
UINT flags;
|
|
UCHAR carryBit;
|
|
SCHAR *pSta;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
|
|
iNode = pHcr->nonPcwSideinfo.iNode;
|
|
pCntSign = pHcr->nonPcwSideinfo.pCntSign;
|
|
pResultBase = pHcr->nonPcwSideinfo.pResultBase;
|
|
iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
|
|
pEscapeSequenceInfo = pHcr->nonPcwSideinfo.pEscapeSequenceInfo;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
pSta = pHcr->nonPcwSideinfo.pSta;
|
|
|
|
iQSC = iResultPointer[codewordOffset];
|
|
cntSign = pCntSign[codewordOffset];
|
|
|
|
|
|
/* loop for sign bit decoding */
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
|
|
/* decrement sign counter because one sign bit has been read */
|
|
cntSign -= 1;
|
|
pCntSign[codewordOffset] = cntSign;
|
|
|
|
/* get a quantized spectral value (which was decoded in previous state) which is not zero. [This value will get a sign] */
|
|
while ( pResultBase[iQSC] == (FIXP_DBL)0 ) {
|
|
iQSC++;
|
|
}
|
|
iResultPointer[codewordOffset] = iQSC;
|
|
|
|
/* put negative sign together with quantized spectral value; if carryBit is zero, the sign is ok already; no write operation necessary in this case */
|
|
if ( carryBit != 0 ) {
|
|
pResultBase[iQSC] = - pResultBase[iQSC]; /* carryBit = 1 --> minus */
|
|
}
|
|
iQSC++; /* update index to next (maybe valid) value */
|
|
iResultPointer[codewordOffset] = iQSC;
|
|
|
|
if ( cntSign == 0 ) {
|
|
/* all sign bits are decoded now */
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* last reinitialzation of for loop counter (see above) is done here */
|
|
|
|
/* check decoded values if codeword is decoded: Check if one or two escape sequences 16 follow */
|
|
|
|
/* step 0 */
|
|
/* restore pointer to first decoded quantized value [ = original pResultPointr] from index iNode prepared in State_BODY_SIGN_ESC__BODY */
|
|
iQSC = iNode[codewordOffset];
|
|
|
|
/* step 1 */
|
|
/* test first value if escape sequence follows */
|
|
flagA = 0; /* for first possible escape sequence */
|
|
if ( fixp_abs(pResultBase[iQSC++]) == (FIXP_DBL)ESCAPE_VALUE ) {
|
|
flagA = 1;
|
|
}
|
|
|
|
/* step 2 */
|
|
/* test second value if escape sequence follows */
|
|
flagB = 0; /* for second possible escape sequence */
|
|
if ( fixp_abs(pResultBase[iQSC]) == (FIXP_DBL)ESCAPE_VALUE ) {
|
|
flagB = 1;
|
|
}
|
|
|
|
|
|
/* step 3 */
|
|
/* evaluate flag result and go on if necessary */
|
|
if ( !flagA && !flagB ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
}
|
|
else {
|
|
/* at least one of two lines is 16 */
|
|
/* store both flags at correct positions in non PCW codeword sideinfo pEscapeSequenceInfo[codewordOffset] */
|
|
flags = 0;
|
|
flags = flagA << POSITION_OF_FLAG_A;
|
|
flags |= (flagB << POSITION_OF_FLAG_B);
|
|
pEscapeSequenceInfo[codewordOffset] = flags;
|
|
|
|
|
|
/* set next state */
|
|
pSta[codewordOffset] = BODY_SIGN_ESC__ESC_PREFIX;
|
|
pHcr->nonPcwSideinfo.pState = aStateConstant2State[pSta[codewordOffset]]; /* get state from separate array of cw-sideinfo */
|
|
|
|
/* set result pointer to the first line of the two decoded lines */
|
|
iResultPointer[codewordOffset] = iNode[codewordOffset];
|
|
|
|
if ( !flagA && flagB ) {
|
|
/* update pResultPointr ==> state Stat_BODY_SIGN_ESC__ESC_WORD writes to correct position. Second value is the one and only escape value */
|
|
iQSC = iResultPointer[codewordOffset];
|
|
iQSC++;
|
|
iResultPointer[codewordOffset] = iQSC;
|
|
}
|
|
|
|
} /* at least one of two lines is 16 */
|
|
break; /* nonPCW-Body at cb 11 and according sign bits are decoded */
|
|
|
|
} /* if ( cntSign == 0 ) */
|
|
} /* loop over remaining Bits in segment */
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_SIGN_ESC__SIGN;
|
|
return BODY_SIGN_ESC__SIGN;
|
|
}
|
|
#endif
|
|
|
|
}
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: Decode escape prefix of first or second escape sequence. The escape prefix
|
|
consists of ones. The following zero is also decoded here.
|
|
-----------------------------------------------------------------------------------------------
|
|
output: If the single separator-zero which follows the escape-prefix-ones is not yet decoded:
|
|
The value 'escapePrefixUp' in word pEscapeSequenceInfo[codewordOffset] is updated.
|
|
|
|
If the single separator-zero which follows the escape-prefix-ones is decoded:
|
|
Two updated values 'escapePrefixUp' and 'escapePrefixDown' in word
|
|
pEscapeSequenceInfo[codewordOffset]. This State is finished. Switch to next state.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_SIGN_ESC__ESC_PREFIX(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
UCHAR readDirection;
|
|
UINT *pSegmentBitfield;
|
|
UINT segmentOffset;
|
|
UINT *pEscapeSequenceInfo;
|
|
UINT codewordOffset;
|
|
UCHAR carryBit;
|
|
UINT escapePrefixUp;
|
|
SCHAR *pSta;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
pEscapeSequenceInfo = pHcr->nonPcwSideinfo.pEscapeSequenceInfo;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
pSta = pHcr->nonPcwSideinfo.pSta;
|
|
|
|
escapePrefixUp = (pEscapeSequenceInfo[codewordOffset] & MASK_ESCAPE_PREFIX_UP) >> LSB_ESCAPE_PREFIX_UP;
|
|
|
|
|
|
/* decode escape prefix */
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
|
|
/* count ones and store sum in escapePrefixUp */
|
|
if ( carryBit == 1 ) {
|
|
escapePrefixUp += 1; /* update conter for ones */
|
|
|
|
/* store updated counter in sideinfo of current codeword */
|
|
pEscapeSequenceInfo[codewordOffset] &= ~MASK_ESCAPE_PREFIX_UP; /* delete old escapePrefixUp */
|
|
escapePrefixUp <<= LSB_ESCAPE_PREFIX_UP; /* shift to correct position */
|
|
pEscapeSequenceInfo[codewordOffset] |= escapePrefixUp; /* insert new escapePrefixUp */
|
|
escapePrefixUp >>= LSB_ESCAPE_PREFIX_UP; /* shift back down */
|
|
}
|
|
else { /* separator [zero] reached */
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* last reinitialzation of for loop counter (see above) is done here */
|
|
escapePrefixUp += 4; /* if escape_separator '0' appears, add 4 and ==> break */
|
|
|
|
/* store escapePrefixUp in pEscapeSequenceInfo[codewordOffset] at bit position escapePrefixUp */
|
|
pEscapeSequenceInfo[codewordOffset] &= ~MASK_ESCAPE_PREFIX_UP; /* delete old escapePrefixUp */
|
|
escapePrefixUp <<= LSB_ESCAPE_PREFIX_UP; /* shift to correct position */
|
|
pEscapeSequenceInfo[codewordOffset] |= escapePrefixUp; /* insert new escapePrefixUp */
|
|
escapePrefixUp >>= LSB_ESCAPE_PREFIX_UP; /* shift back down */
|
|
|
|
/* store escapePrefixUp in pEscapeSequenceInfo[codewordOffset] at bit position escapePrefixDown */
|
|
pEscapeSequenceInfo[codewordOffset] &= ~MASK_ESCAPE_PREFIX_DOWN; /* delete old escapePrefixDown */
|
|
escapePrefixUp <<= LSB_ESCAPE_PREFIX_DOWN; /* shift to correct position */
|
|
pEscapeSequenceInfo[codewordOffset] |= escapePrefixUp; /* insert new escapePrefixDown */
|
|
escapePrefixUp >>= LSB_ESCAPE_PREFIX_DOWN; /* shift back down */
|
|
|
|
pSta[codewordOffset] = BODY_SIGN_ESC__ESC_WORD; /* set next state */
|
|
pHcr->nonPcwSideinfo.pState = aStateConstant2State[pSta[codewordOffset]]; /* get state from separate array of cw-sideinfo */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_SIGN_ESC__ESC_PREFIX;
|
|
return BODY_SIGN_ESC__ESC_PREFIX;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------------------------------
|
|
description: Decode escapeWord of escape sequence. If the escape sequence is decoded
|
|
completely, assemble quantized-spectral-escape-coefficient and replace the
|
|
previous decoded 16 by the new value.
|
|
Test flagB. If flagB is set, the second escape sequence must be decoded. If
|
|
flagB is not set, the codeword is decoded and the state machine is switched
|
|
off.
|
|
-----------------------------------------------------------------------------------------------
|
|
output: Two lines with valid sign. At least one of both lines has got the correct
|
|
value.
|
|
-----------------------------------------------------------------------------------------------
|
|
return: 0
|
|
-------------------------------------------------------------------------------------------- */
|
|
UINT Hcr_State_BODY_SIGN_ESC__ESC_WORD(HANDLE_FDK_BITSTREAM bs, void *ptr)
|
|
{
|
|
H_HCR_INFO pHcr = (H_HCR_INFO)ptr;
|
|
SCHAR *pRemainingBitsInSegment;
|
|
USHORT *pLeftStartOfSegment;
|
|
USHORT *pRightStartOfSegment;
|
|
UCHAR readDirection;
|
|
UINT *pSegmentBitfield;
|
|
UINT *pCodewordBitfield;
|
|
UINT segmentOffset;
|
|
|
|
FIXP_DBL *pResultBase;
|
|
USHORT *iResultPointer;
|
|
UINT *pEscapeSequenceInfo;
|
|
UINT codewordOffset;
|
|
|
|
UINT escapeWord;
|
|
UINT escapePrefixDown;
|
|
UINT escapePrefixUp;
|
|
UCHAR carryBit;
|
|
UINT iQSC;
|
|
INT sign;
|
|
UINT flagA;
|
|
UINT flagB;
|
|
SCHAR *pSta;
|
|
|
|
pRemainingBitsInSegment = pHcr->segmentInfo.pRemainingBitsInSegment;
|
|
pLeftStartOfSegment = pHcr->segmentInfo.pLeftStartOfSegment;
|
|
pRightStartOfSegment = pHcr->segmentInfo.pRightStartOfSegment;
|
|
readDirection = pHcr->segmentInfo.readDirection;
|
|
pSegmentBitfield = pHcr->segmentInfo.pSegmentBitfield;
|
|
pCodewordBitfield = pHcr->segmentInfo.pCodewordBitfield;
|
|
segmentOffset = pHcr->segmentInfo.segmentOffset;
|
|
|
|
pResultBase = pHcr->nonPcwSideinfo.pResultBase;
|
|
iResultPointer = pHcr->nonPcwSideinfo.iResultPointer;
|
|
pEscapeSequenceInfo = pHcr->nonPcwSideinfo.pEscapeSequenceInfo;
|
|
codewordOffset = pHcr->nonPcwSideinfo.codewordOffset;
|
|
pSta = pHcr->nonPcwSideinfo.pSta;
|
|
|
|
escapeWord = pEscapeSequenceInfo[codewordOffset] & MASK_ESCAPE_WORD;
|
|
escapePrefixDown = (pEscapeSequenceInfo[codewordOffset] & MASK_ESCAPE_PREFIX_DOWN) >> LSB_ESCAPE_PREFIX_DOWN;
|
|
|
|
|
|
/* decode escape word */
|
|
for ( ; pRemainingBitsInSegment[segmentOffset] > 0 ; pRemainingBitsInSegment[segmentOffset] -= 1 ) {
|
|
|
|
carryBit = HcrGetABitFromBitstream( bs,
|
|
&pLeftStartOfSegment[segmentOffset],
|
|
&pRightStartOfSegment[segmentOffset],
|
|
readDirection);
|
|
|
|
/* build escape word */
|
|
escapeWord <<= 1; /* left shift previous decoded part of escapeWord by on bit */
|
|
escapeWord = escapeWord | carryBit; /* assemble escape word by bitwise or */
|
|
|
|
/* decrement counter for length of escape word because one more bit was decoded */
|
|
escapePrefixDown -= 1;
|
|
|
|
/* store updated escapePrefixDown */
|
|
pEscapeSequenceInfo[codewordOffset] &= ~MASK_ESCAPE_PREFIX_DOWN; /* delete old escapePrefixDown */
|
|
escapePrefixDown <<= LSB_ESCAPE_PREFIX_DOWN; /* shift to correct position */
|
|
pEscapeSequenceInfo[codewordOffset] |= escapePrefixDown; /* insert new escapePrefixDown */
|
|
escapePrefixDown >>= LSB_ESCAPE_PREFIX_DOWN; /* shift back */
|
|
|
|
|
|
/* store updated escapeWord */
|
|
pEscapeSequenceInfo[codewordOffset] &= ~MASK_ESCAPE_WORD; /* delete old escapeWord */
|
|
pEscapeSequenceInfo[codewordOffset] |= escapeWord; /* insert new escapeWord */
|
|
|
|
|
|
if ( escapePrefixDown == 0 ) {
|
|
pRemainingBitsInSegment[segmentOffset] -= 1; /* last reinitialzation of for loop counter (see above) is done here */
|
|
|
|
/* escape sequence decoded. Assemble escape-line and replace original line */
|
|
|
|
/* step 0 */
|
|
/* derive sign */
|
|
iQSC = iResultPointer[codewordOffset];
|
|
sign = (pResultBase[iQSC] >= (FIXP_DBL)0) ? 1 : -1; /* get sign of escape value 16 */
|
|
|
|
/* step 1 */
|
|
/* get escapePrefixUp */
|
|
escapePrefixUp = (pEscapeSequenceInfo[codewordOffset] & MASK_ESCAPE_PREFIX_UP) >> LSB_ESCAPE_PREFIX_UP;
|
|
|
|
/* step 2 */
|
|
/* calculate escape value */
|
|
pResultBase[iQSC] = (FIXP_DBL)(sign * (((INT) 1 << escapePrefixUp) + escapeWord));
|
|
|
|
/* get both flags from sideinfo (flags are not shifted to the lsb-position) */
|
|
flagA = pEscapeSequenceInfo[codewordOffset] & MASK_FLAG_A;
|
|
flagB = pEscapeSequenceInfo[codewordOffset] & MASK_FLAG_B;
|
|
|
|
/* step 3 */
|
|
/* clear the whole escape sideinfo word */
|
|
pEscapeSequenceInfo[codewordOffset] = 0;
|
|
|
|
/* change state in dependence of flag flagB */
|
|
if ( flagA != 0 ) {
|
|
/* first escape sequence decoded; previous decoded 16 has been replaced by valid line */
|
|
|
|
/* clear flagA in sideinfo word because this escape sequence has already beed decoded */
|
|
pEscapeSequenceInfo[codewordOffset] &= ~MASK_FLAG_A;
|
|
|
|
if ( flagB == 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
}
|
|
else {
|
|
/* updated pointer to next and last 16 */
|
|
iQSC++;
|
|
iResultPointer[codewordOffset] = iQSC;
|
|
|
|
/* change state */
|
|
pSta[codewordOffset] = BODY_SIGN_ESC__ESC_PREFIX;
|
|
pHcr->nonPcwSideinfo.pState = aStateConstant2State[pSta[codewordOffset]]; /* get state from separate array of cw-sideinfo */
|
|
}
|
|
}
|
|
else {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pCodewordBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( pRemainingBitsInSegment[segmentOffset] <= 0 ) {
|
|
ClearBitFromBitfield(&(pHcr->nonPcwSideinfo.pState),
|
|
segmentOffset,
|
|
pSegmentBitfield); /* clear a bit in bitfield and switch off statemachine */
|
|
|
|
#if STATE_MACHINE_ERROR_CHECK
|
|
if ( pRemainingBitsInSegment[segmentOffset] < 0 ) {
|
|
pHcr->decInOut.errorLog |= STATE_ERROR_BODY_SIGN_ESC__ESC_WORD;
|
|
return BODY_SIGN_ESC__ESC_WORD;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return STOP_THIS_STATE;
|
|
}
|
|
|