diff options
Diffstat (limited to 'media/libstagefright/codecs/aacdec/hufffac.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/hufffac.cpp | 550 |
1 files changed, 0 insertions, 550 deletions
diff --git a/media/libstagefright/codecs/aacdec/hufffac.cpp b/media/libstagefright/codecs/aacdec/hufffac.cpp deleted file mode 100644 index e5a9c59..0000000 --- a/media/libstagefright/codecs/aacdec/hufffac.cpp +++ /dev/null @@ -1,550 +0,0 @@ -/* ------------------------------------------------------------------ - * Copyright (C) 1998-2009 PacketVideo - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either - * express or implied. - * See the License for the specific language governing permissions - * and limitations under the License. - * ------------------------------------------------------------------- - */ -/* - - Pathname: ./src/hufffac.c - Funtions: - hufffac - ------------------------------------------------------------------------------- - REVISION HISTORY - - Description: Modified from original shareware code - - Description: Modified to pass variables by reference to eliminate use - of global variables. - - Description: (1) Modified with new templates, - (2) Modified variable names for clarity - (3) adjusted variables of "for loop" - (4) eliminated multiple returns, use return valid - - Description: (1) Change return logic: 0 if success, 1 if error - (2) Define SectInfo structure to store section codebook index - and section boundary - (3) Substitute "switch" with "if- else if" - (4) move BITS *pInputStream to second pass-in parameter - (5) pass in huffBookUsed[] to save stack size - - Description: (1) Remove pass in parameter Hcb pBook - - Description: Use binary tree search in decode_huff_cw_binary - - Description: Use decode_huff_scl function. - - Who: Date: MM/DD/YYYY - Description: - ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - - *pFrameInfo = pointer to structure that holds information - of each Frame. type FrameInfo - - *pInputStream = pointer to input bitstream. type BITS - - *pGroup = pointer to array that contains the index of the first - window in each group, type UChar - - nsect = number of sections to be decoded. type Int - - *pSect = pointer to structure array that contains the huffman - codebook index and section boundary for each section, - type SectInfo - - global_gain = initial value for "DPCM encoded" scalefactors and noise - energy, type Int - - *pFactors = pointer to array that stores the decoded scalefactors, - intensity position or noise energy, type Int - - huffBookUsed = array that will hold the huffman codebook index for - each sfb, type Int - - *pBook = pointer to structure that contains the huffman codebook - information, such as dimension, Largest Absolute Value - (LAV) of each huffman codebook, etc. type Hcb - - - Local Stores/Buffers/Pointers Needed: None - - Global Stores/Buffers/Pointers Needed: None - - Outputs: - 0 if success - 1 if error - - Pointers and Buffers Modified: - - Int *pFactors contains the newly decoded scalefactors and/or - intensity position and/or noise energy level - - Local Stores Modified: - - Global Stores Modified: - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - This function first reads the Huffman codebook index of all sections within - one Frame. Then, depending on the huffman codebook index of each section, - the function decodes the scalefactors, and/or intensity positions - (INTENSITY_HCB, INTENSITY_HCB2), and/or noise energy (NOISE_HCB) - for every scalefactor band in each section. - The function returns 0 upon successful decoding, returns 1 if error. - ------------------------------------------------------------------------------- - REQUIREMENTS - - This function should replace the content of the array pFactors with the - decoded scalefactors and/or intensity positions and/or noise energy - ------------------------------------------------------------------------------- - REFERENCES - - (1) MPEG-2 NBC Audio Decoder - "This software module was originally developed by AT&T, Dolby - Laboratories, Fraunhofer Gesellschaft IIS in the course of development - of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7, 14496-1,2 and - 3. This software module is an implementation of a part of one or more - MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4 - Audio standard. ISO/IEC gives users of the MPEG-2 NBC/MPEG-4 Audio - standards free license to this software module or modifications thereof - for use in hardware or software products claiming conformance to the - MPEG-2 NBC/MPEG-4 Audio standards. Those intending to use this software - module in hardware or software products are advised that this use may - infringe existing patents. The original developer of this software - module and his/her company, the subsequent editors and their companies, - and ISO/IEC have no liability for use of this software module or - modifications thereof in an implementation. Copyright is not released - for non MPEG-2 NBC/MPEG-4 Audio conforming products.The original - developer retains full right to use the code for his/her own purpose, - assign or donate the code to a third party and to inhibit third party - from using the code for non MPEG-2 NBC/MPEG-4 Audio conforming products. - This copyright notice must be included in all copies or derivative - works." - Copyright(c)1996. - - (2) ISO/IEC 14496-3: 1999(E) - Subpart 4 p72-73 (scalefactors) - p76 (decoding) - p78 (Table 4.6.1, Table 4.6.2) - p93-94 (INTENSITY_HCB) - p123 (NOISE_HCB) - ------------------------------------------------------------------------------- - PSEUDO-CODE - - status = SUCCESS; - - CALL pv_memset(pHuffBookUsed, ZERO_HCB, MAXBANDS*sizeof(*pHuffBookUsed)); - - CALL pv_memset(pFactors, ZERO_HCB, MAXBANDS*sizeof(*pFactors)); - - sect_start = 0; - - FOR(sect_idx = nsect; sect_idx > 0; sect_idx--) - { - sect_cb = pSect->sect_cb; - sect_end = pSect->sect_end; - pSect++; - - CALL pv_memset( - &pHuffBookUsed[sect_start], - sect_cb, - (sect_end - sect_start)); - - } - ENDFOR - - fac = global_gain; - is_pos = 0; - noise_nrg = global_gain - NOISE_OFFSET; - - pTable = pBook[BOOKSCL].pTable; - group_win = 0; - group_end = 0; - - WHILE((group_end < pFrameInfo->num_win)&&(status == SUCCESS)) - { - nsfb_win = pFrameInfo->sfb_per_win[group_end]; - group_end = *pGroup++; - - FOR(sfb = 0; sfb < nsfb_win; sfb++) - { - IF ((pHuffBookUsed[sfb] > 0)&&(pHuffBookUsed[sfb] < BOOKSCL)) - { - cw_index = CALL decode_huff_cw_binary(pTable, pInputStream); - - fac += cw_index - MIDFAC; - - IF((fac >= 2*TEXP) || (fac < 0)) - { - status = 1; - } - ELSE - { - pFactors[sfb] = fac; - } - ENDIF (fac) - - } - ELSE IF (pHuffBookUsed[sfb] == ZERO_HCB) - { - do nothing; - } - - ELSE IF ((pHuffBookUsed[sfb] == INTENSITY_HCB)|| - (pHuffBookUsed[sfb] == INTENSITY_HCB2)) - { - cw_index = CALL decode_huff_cw_binary(pTable, pInputStream); - - is_pos += cw_index - MIDFAC; - pFactors[sfb] = is_pos; - } - - ELSE IF (pHuffBookUsed[sfb] == NOISE_HCB) - { - IF (noise_pcm_flag == TRUE) - { - noise_pcm_flag = FALSE; - dpcm_noise_nrg = CALL getbits( - NOISE_PCM_BITS, - pInputStream); - - dpcm_noise_nrg -= NOISE_PCM_OFFSET; - } - ELSE - { - dpcm_noise_nrg = CALL decode_huff_cw_binary( - pTable, - pInputStream); - - dpcm_noise_nrg -= MIDFAC; - } - ENDIF (noise_pcm_flag) - - noise_nrg += dpcm_noise_nrg; - pFactors[sfb] = noise_nrg; - } - - ELSE IF (pHuffBookUsed[sfb] == BOOKSCL) - { - status = 1; - } - ENDIF (pHuffBookUsed[sfb]) - - } - ENDFOR (sfb) - - IF (pFrameInfo->islong == FALSE) - { - - FOR(group_win++; group_win < group_end; group_win++) - { - FOR (sfb=0; sfb < nsfb_win; sfb++) - { - pFactors[sfb + nsfb_win] = pFactors[sfb]; - } - ENDFOR - - pFactors += nsfb_win; - } - ENDFOR - - } - ENDIF (pFrameInfo) - - pHuffBookUsed += nsfb_win; - pFactors += nsfb_win; - - } - ENDWHILE (group_end) - - return status; - ------------------------------------------------------------------------------- - RESOURCES USED - When the code is written for a specific target processor the - the resources used should be documented below. - - STACK USAGE: [stack count for this module] + [variable to represent - stack usage for each subroutine called] - - where: [stack usage variable] = stack usage for [subroutine - name] (see [filename].ext) - - DATA MEMORY USED: x words - - PROGRAM MEMORY USED: x words - - CLOCK CYCLES: [cycle count equation for this module] + [variable - used to represent cycle count for each subroutine - called] - - where: [cycle count variable] = cycle count for [subroutine - name] (see [filename].ext) - ------------------------------------------------------------------------------- -*/ - - -/*---------------------------------------------------------------------------- -; INCLUDES -----------------------------------------------------------------------------*/ -#include "pv_audio_type_defs.h" -#include "aac_mem_funcs.h" /* pv_memset */ -#include "s_frameinfo.h" -#include "s_bits.h" -#include "s_sectinfo.h" -#include "s_huffman.h" -#include "ibstream.h" - -#include "hcbtables.h" -#include "e_huffmanconst.h" -#include "e_infoinitconst.h" -#include "huffman.h" - -/*---------------------------------------------------------------------------- -; MACROS -; Define module specific macros here -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; DEFINES -; Include all pre-processor statements here. Include conditional -; compile variables also. -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL FUNCTION DEFINITIONS -; Function Prototype declaration -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL STORE/BUFFER/POINTER DEFINITIONS -; Variable declaration - defined here and used outside this module -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; EXTERNAL FUNCTION REFERENCES -; Declare functions defined elsewhere and referenced in this module -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES -; Declare variables used in this module but defined elsewhere -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; FUNCTION CODE -----------------------------------------------------------------------------*/ -Int hufffac( - FrameInfo *pFrameInfo, - BITS *pInputStream, - Int *pGroup, /* may be changed to Int */ - Int nsect, - SectInfo *pSect, /* may be changed to Int */ - Int global_gain, - Int *pFactors, - Int huffBookUsed[]) -{ - Int sect_idx; - Int group_end; /* index of 1st window in next group */ - Int group_win; /* window index within group */ - Int cw_index; /* huff codeword index */ - Int nsfb_win; /* # of scfbands per window */ - Int sfb; /* scalefactor band index */ - Int sect_cb; /* huff codebook # for each section */ - Int fac; /* decoded scf */ - Int is_pos; /* intensity stereo position */ - Int noise_pcm_flag = TRUE; /* first PNS sfb */ - Int dpcm_noise_nrg; /* dpcm noise energy */ - Int noise_nrg; /* noise energy */ - Int status = SUCCESS; /* status of decoding */ - Int *pHuffBookUsed = &huffBookUsed[0]; - - - pv_memset(pFactors, - ZERO_HCB, - MAXBANDS*sizeof(*pFactors)); - - - if (nsect) - { - /* read section length and codebook */ - - if (nsect == 1) /* long window */ - { - sect_cb = pSect->sect_cb; /* codebook for this section */ - - /* all sfbs in one section share the same codebook */ - - for (sfb = pSect->sect_end >> 2; sfb != 0; sfb--) - { - *(pHuffBookUsed++) = sect_cb; - *(pHuffBookUsed++) = sect_cb; - *(pHuffBookUsed++) = sect_cb; - *(pHuffBookUsed++) = sect_cb; - } - for (sfb = pSect->sect_end & 3; sfb != 0; sfb--) - { - *(pHuffBookUsed++) = sect_cb; - } - - } - else /* short */ - { - Int sect_start = 0; /* start index of sfb for each section */ - for (sect_idx = nsect; sect_idx > 0; sect_idx--) - { - sect_cb = pSect->sect_cb; /* codebook for this section */ - - /* all sfbs in one section share the same codebook */ - for (sfb = sect_start; sfb < pSect->sect_end; sfb++) - { - pHuffBookUsed[sfb] = sect_cb; - } - - pSect++; - sect_start = sfb; - - } /* for (sect_idx) */ - } - } - else - { - /* clear array for the case of max_sfb == 0 */ - pv_memset(pHuffBookUsed, - ZERO_HCB, - MAXBANDS*sizeof(*pHuffBookUsed)); - } - - pHuffBookUsed = &huffBookUsed[0]; - - /* scale factors and noise energy are dpcm relative to global gain - * intensity positions are dpcm relative to zero - */ - fac = global_gain; - is_pos = 0; - noise_nrg = global_gain - NOISE_OFFSET; - - /* get scale factors, - * use reserved Table entry = 12, see reference (2) p78 Table 4.6.2 - */ - group_win = 0; - group_end = 0; - - - /* group by group decoding scalefactors and/or noise energy - * and/or intensity position - */ - while ((group_end < pFrameInfo->num_win) && (status == SUCCESS)) - { - nsfb_win = pFrameInfo->sfb_per_win[group_end]; - group_end = *pGroup++; /* index of 1st window in next group */ - - /* decode scf in first window of each group */ - - for (sfb = 0; sfb < nsfb_win; sfb++) - { - - switch (pHuffBookUsed[sfb]) - { - case ZERO_HCB: - break; - case INTENSITY_HCB: - case INTENSITY_HCB2: - /* intensity books */ - /* decode intensity position */ - cw_index = decode_huff_scl(pInputStream); - - is_pos += cw_index - MIDFAC; - pFactors[sfb] = is_pos; - break; - case NOISE_HCB: - /* noise books */ - /* decode noise energy */ - if (noise_pcm_flag == TRUE) - { - noise_pcm_flag = FALSE; - dpcm_noise_nrg = get9_n_lessbits(NOISE_PCM_BITS, - pInputStream); - - dpcm_noise_nrg -= NOISE_PCM_OFFSET; - } - else - { - dpcm_noise_nrg = decode_huff_scl(pInputStream); - - dpcm_noise_nrg -= MIDFAC; - } /* if (noise_pcm_flag) */ - - noise_nrg += dpcm_noise_nrg; - pFactors[sfb] = noise_nrg; - break; - case BOOKSCL: - status = 1; /* invalid books */ - sfb = nsfb_win; /* force out */ - break; - default: - /* spectral books */ - /* decode scale factors */ - cw_index = decode_huff_scl(pInputStream); - - fac += cw_index - MIDFAC; /* 1.5 dB */ - if ((fac >= 2*TEXP) || (fac < 0)) - { - status = 1; /* error, MUST 0<=scf<256, Ref. p73 */ - } - else - { - pFactors[sfb] = fac; /* store scf */ - } /* if (fac) */ - } - - } /* for (sfb=0), first window decode ends */ - - /* expand scf to other windows in the same group */ - if (pFrameInfo->islong == FALSE) - { - - for (group_win++; group_win < group_end; group_win++) - { - for (sfb = 0; sfb < nsfb_win; sfb++) - { - pFactors[sfb + nsfb_win] = pFactors[sfb]; - } - pFactors += nsfb_win; - } - - } /* if (pFrameInfo->islong), one group decode ends */ - - - /* points to next group */ - pHuffBookUsed += nsfb_win; - pFactors += nsfb_win; - - } /* while (group_end), all groups decode end */ - - return status; - -} /* hufffac */ - |