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Diffstat (limited to 'media/libtheora/lib/quant.c')
| -rw-r--r-- | media/libtheora/lib/quant.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/media/libtheora/lib/quant.c b/media/libtheora/lib/quant.c deleted file mode 100644 index c3f3f4771..000000000 --- a/media/libtheora/lib/quant.c +++ /dev/null @@ -1,127 +0,0 @@ -/******************************************************************** - * * - * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. * - * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * - * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * - * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * - * * - * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 * - * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * - * * - ******************************************************************** - - function: - last mod: $Id: quant.c 17307 2010-06-27 06:02:15Z tterribe $ - - ********************************************************************/ - -#include <stdlib.h> -#include <string.h> -#include <ogg/ogg.h> -#include "quant.h" -#include "decint.h" - -/*The maximum output of the DCT with +/- 255 inputs is +/- 8157. - These minimum quantizers ensure the result after quantization (and after - prediction for DC) will be no more than +/- 510. - The tokenization system can handle values up to +/- 580, so there is no need - to do any coefficient clamping. - I would rather have allowed smaller quantizers and had to clamp, but these - minimums were required when constructing the original VP3 matrices and have - been formalized in the spec.*/ -static const unsigned OC_DC_QUANT_MIN[2]={4<<2,8<<2}; -static const unsigned OC_AC_QUANT_MIN[2]={2<<2,4<<2}; - -/*Initializes the dequantization tables from a set of quantizer info. - Currently the dequantizer (and elsewhere enquantizer) tables are expected to - be initialized as pointing to the storage reserved for them in the - oc_theora_state (resp. oc_enc_ctx) structure. - If some tables are duplicates of others, the pointers will be adjusted to - point to a single copy of the tables, but the storage for them will not be - freed. - If you're concerned about the memory footprint, the obvious thing to do is - to move the storage out of its fixed place in the structures and allocate - it on demand. - However, a much, much better option is to only store the quantization - matrices being used for the current frame, and to recalculate these as the - qi values change between frames (this is what VP3 did).*/ -void oc_dequant_tables_init(ogg_uint16_t *_dequant[64][3][2], - int _pp_dc_scale[64],const th_quant_info *_qinfo){ - /*Coding mode: intra or inter.*/ - int qti; - /*Y', C_b, C_r*/ - int pli; - for(qti=0;qti<2;qti++)for(pli=0;pli<3;pli++){ - /*Quality index.*/ - int qi; - /*Range iterator.*/ - int qri; - for(qi=0,qri=0;qri<=_qinfo->qi_ranges[qti][pli].nranges;qri++){ - th_quant_base base; - ogg_uint32_t q; - int qi_start; - int qi_end; - memcpy(base,_qinfo->qi_ranges[qti][pli].base_matrices[qri], - sizeof(base)); - qi_start=qi; - if(qri==_qinfo->qi_ranges[qti][pli].nranges)qi_end=qi+1; - else qi_end=qi+_qinfo->qi_ranges[qti][pli].sizes[qri]; - /*Iterate over quality indicies in this range.*/ - for(;;){ - ogg_uint32_t qfac; - int zzi; - int ci; - /*In the original VP3.2 code, the rounding offset and the size of the - dead zone around 0 were controlled by a "sharpness" parameter. - The size of our dead zone is now controlled by the per-coefficient - quality thresholds returned by our HVS module. - We round down from a more accurate value when the quality of the - reconstruction does not fall below our threshold and it saves bits. - Hence, all of that VP3.2 code is gone from here, and the remaining - floating point code has been implemented as equivalent integer code - with exact precision.*/ - qfac=(ogg_uint32_t)_qinfo->dc_scale[qi]*base[0]; - /*For postprocessing, not dequantization.*/ - if(_pp_dc_scale!=NULL)_pp_dc_scale[qi]=(int)(qfac/160); - /*Scale DC the coefficient from the proper table.*/ - q=(qfac/100)<<2; - q=OC_CLAMPI(OC_DC_QUANT_MIN[qti],q,OC_QUANT_MAX); - _dequant[qi][pli][qti][0]=(ogg_uint16_t)q; - /*Now scale AC coefficients from the proper table.*/ - for(zzi=1;zzi<64;zzi++){ - q=((ogg_uint32_t)_qinfo->ac_scale[qi]*base[OC_FZIG_ZAG[zzi]]/100)<<2; - q=OC_CLAMPI(OC_AC_QUANT_MIN[qti],q,OC_QUANT_MAX); - _dequant[qi][pli][qti][zzi]=(ogg_uint16_t)q; - } - /*If this is a duplicate of a previous matrix, use that instead. - This simple check helps us improve cache coherency later.*/ - { - int dupe; - int qtj; - int plj; - dupe=0; - for(qtj=0;qtj<=qti;qtj++){ - for(plj=0;plj<(qtj<qti?3:pli);plj++){ - if(!memcmp(_dequant[qi][pli][qti],_dequant[qi][plj][qtj], - sizeof(oc_quant_table))){ - dupe=1; - break; - } - } - if(dupe)break; - } - if(dupe)_dequant[qi][pli][qti]=_dequant[qi][plj][qtj]; - } - if(++qi>=qi_end)break; - /*Interpolate the next base matrix.*/ - for(ci=0;ci<64;ci++){ - base[ci]=(unsigned char)( - (2*((qi_end-qi)*_qinfo->qi_ranges[qti][pli].base_matrices[qri][ci]+ - (qi-qi_start)*_qinfo->qi_ranges[qti][pli].base_matrices[qri+1][ci]) - +_qinfo->qi_ranges[qti][pli].sizes[qri])/ - (2*_qinfo->qi_ranges[qti][pli].sizes[qri])); - } - } - } - } -} |